PUMP DRIVE SYSTEM

A rotational output assembly is configured to provide power to a drive assembly to cause pumping by a pump. The rotational output assembly includes an electric motor and a pinion drive projecting axially from the motor. The pinion drive interfaces with bearings supported on a pump frame. The pinion drive includes a gear teeth section between portions interfacing with the bearings supported on the pump frame. The gear teeth section interfaces with a drive gear of the drive assembly to cause rotation of the drive gear.

BACKGROUND

The present disclosure relates generally to fluid displacement systems and, more particularly, to drive systems for reciprocating fluid displacement pumps.

Fluid displacement systems, such as fluid dispensing systems for paint, typically utilize positive displacement pumps such as axial displacement pumps to pull a fluid, such as paint, from a container and to drive the fluid downstream. The axial displacement pump is typically mounted to a drive housing and driven by a motor. A pump rod is attached to a reciprocating drive that drives reciprocation of the pump rod, thereby pulling fluid from a container into the pump and then driving the fluid downstream from the pump. In some cases, electric motors can power the pump.

SUMMARY

According to an aspect of the present disclosure, a fluid pumping assembly includes an electric motor having a stator and a rotor comprising a rotor housing and configured to rotate on a motor axis; a pinion cap formed separate from and attached to the rotor housing, the pinion cap comprising a gear teeth section; a drive gear that interfaces with the gear teeth section at a toothed interface; an eccentric that receives rotational motion from the drive gear; and a pump that receives reciprocating motion from the eccentric.

According to an additional or alternative aspect of the present disclosure, a fluid pumping assembly including an electric motor configured to generate a rotational output and having a stator and a rotor comprising a rotor housing and configured to rotate on a motor axis, the rotor including a first end wall, a second end wall, and a rotor body therebetween; a stud projecting from the first end wall, the stud projecting in a first axial direction along the motor axis and away from the stator; a pinion cap formed separate from and attached to the rotor, the pinion cap mounted on the stud, the pinion cap including a gear teeth section; a drive interfacing the pinion cap at a toothed interface to receive the rotational output from the electric motor via the pinion cap, the drive configured to convert the rotational output into reciprocating motion; and a pump that receives reciprocating motion from the drive.

According to another additional or alternative aspect of the present disclosure, a rotational output assembly configured to power pumping by a pump via a drive includes an electric motor having a stator and a rotor comprising a rotor housing and configured to rotate on a motor axis, the rotor including a first end wall, a second end wall, and a rotor body therebetween; a stud projecting from the first end wall, the stud projecting in a first axial direction along the motor axis and away from the stator; and a pinion cap formed separate from and attached to the rotor, the pinion cap mounted on the stud, the pinion cap including a gear teeth section between a first pinion end of the pinion cap and a second pinion end of the pinion cap, the second pinion end disposed between the gear teeth section and the rotor.

According to another additional or alternative aspect of the present disclosure, a fluid pumping assembly includes an electric motor having a stator and a rotor comprising a rotor housing and configured to rotate on a motor axis; a pinion drive extending axially from the rotor housing and including a first pinion end, a second pinion end, and a gear teeth section disposed between the first pinion end and the second pinion end; a first pinion bearing interfacing with the first pinion end; a second pinion bearing interfacing with the second pinion end; a drive gear that interfaces with the gear teeth section at a toothed interface; an eccentric that receives rotational motion from the drive gear; and a pump that receives reciprocating motion from the eccentric.

According to another additional or alternative aspect of the present disclosure, a fluid pumping assembly includes a pump frame; a motor supported by the pump frame and having a rotor and a stator, the rotor supported relative to the stator by at least one motor bearing disposed within the motor such that the rotor rotates on a motor axis; a pinion drive extending axially from a first end of the rotor, a drive gear interfacing with the pinion drive at a toothed interface between the drive gear and the pinion drive; and an eccentric connected to the drive gear to be rotated by the drive gear. The pinion drive includes a first pinion end interfacing with a first pinion bearing supported by the pump frame; a second pinion end interfacing with a second pinion bearing supported by the pump frame; and a gear teeth section disposed axially between the first pinion end and the second pinion end.

According to another additional or alternative aspect of the present disclosure, a fluid pumping assembly including a pump frame at least partially defining a gear chamber; a drive gear supported by the pump frame; an eccentric that receives rotational motion from the drive gear; a first pinion bearing captured by the pump frame; a second pinion bearing captured by the pump frame; and a rotational output assembly including an electric motor and a pinion drive. The electric motor includes a stator and a rotor comprising a rotor housing and configured to rotate on a motor axis. The pinion drive extends axially from the rotor housing and including a first pinion end, a second pinion end, and a gear teeth section disposed between the first pinion end and the second pinion end, the gear teeth section configured to interface with the drive gear at the toothed interface disposed at least partially within the gear chamber. The rotational output assembly mountable to the pump frame by movement of the rotational output assembly in a first axial direction along the motor axis, and the rotational output assembly dismountable from the pump frame by movement of the rotational output assembly in a second axial direction opposite the first axial direction.

According to another additional or alternative aspect of the present disclosure, a modular pumping assembly including a pump frame configured to support a displacement pump; a first pinion bearing captured by the pump frame; a second pinion bearing aligned with the first pinion bearing on a pinion support axis, the second pinion bearing captured by the pump frame; and first rotational output assembly. The first rotational output assembly includes a first electric motor and a first pinion drive. The first electric motor includes a first stator; and a first rotor comprising a first rotor housing and configured to rotate on a first motor axis. The first pinion drive extends axially from the first rotor housing and including a first pinion end, a second pinion end, and a first gear teeth section disposed between the first pinion end and the second pinion end, the first gear teeth section configured to output rotational motion from the first rotor at a first toothed interface. The first rotational output assembly mountable to the pump frame by movement of the first rotational output assembly in a first axial direction along the pinion support axis with the first motor axis disposed coaxial with the pinion support axis.

The first rotational output assembly dismountable from the pump frame by movement of the first rotational output assembly in a second axial direction opposite the first axial direction.

According to another additional or alternative aspect of the present disclosure, a method of mounting a rotational output generator to a pumping assembly includes aligning a rotational output assembly with a pump frame such that a rotational axis of the motor is aligned coaxially with a pinion bearing axis through the pump frame; and shifting the rotational output assembly axially relative to the pinion axis and in a first axial direction to form a dynamic mechanical connection between the rotational output assembly and the pump frame, the rotational output assembly configured to power pumping by a pump supported by the pump frame.

DETAILED DESCRIPTION

The present disclosure is directed to a drive system for a reciprocating fluid displacement pump. The drive system of the present disclosure has an electric motor with an eccentric driver. A drive converts rotational output of the rotor to linear, reciprocating input to the fluid displacement member. The rotor can be disposed outside of the stator to rotate about the stator such that the motor is an outer rotator motor. The rotor includes a pinion drive that projects axially from the motor. The pinion drive interfaces with a gear of the drive to provide rotational input to the drive.

Spray system10is a system for applying sprays of various fluids, examples of which include paint, water, oil, stains, finishes, aggregate, coatings, and solvents, amongst other options, onto a substrate. Fluid displacement assembly20, which can also be referred to as a pump assembly, can generate high fluid pumping pressures, such as about 3.4-69 megapascal (MPa) (about 500-10,000 pounds per square inch (psi)) or even higher. In some examples, the pumping pressures are in the range of about 20.7-34.5 MPa (about 3,000-5,000 psi). High fluid pumping pressure is useful for atomizing the fluid into a spray for applying the fluid to a surface.

Fluid displacement assembly20is configured to draw spray fluid from reservoir14, increase the pressure of the spray fluid, and pump the spray fluid downstream to spray gun5for application on the substrate. Support12is connected to fluid displacement assembly20and supports fluid displacement assembly20relative to reservoir14. Support12can receive and react loads from fluid displacement assembly20during pumping. For example, system frame32can be connected to rotational output assembly22to react the loads generated during pumping. Pump frame44forms a portion of the system frame32that is connected to and supports rotational output assembly22. In some examples, system frame32is formed separate from and connected to pump frame44, such as by bolts, welding, etc. Wheels34are connected to system frame32to facilitate movement of fluid displacement assembly20between job sites and within a job site.

Pump frame44supports other components of fluid displacement assembly20. Rotational output assembly22and displacement pump26are supported by pump frame44. In some examples, rotational output assembly22and displacement pump26are connected to pump frame44. For example, the rotational output assembly22can be mounted to the pump frame44by a dynamic interface and a static interface. Pump frame44supports the rotational output assembly22at the dynamic interface such that loads can be transmitted through the dynamic interface (e.g., from rotational output assembly22to pump frame44). The dynamic interface supports the rotational output assembly22while allowing rotating components of rotational output assembly22to rotate relative to the pump frame44. The dynamic interface can be formed between pump frame44and pinion drive30. The static interface is formed such that loads can be transmitted through the static interface. The static interface supports the rotational output assembly22such that a non-moving component of rotational output assembly22interfaces with pump frame44at the static interface. The static interface can be formed between support12and motor28.

Pinion drive30is connected to the motor28to be rotated by the motor28. Motor28is an electric motor having a stator and a rotor. Motor28can be configured to be powered by any desired power type, such as direct current (DC), alternating current (AC), and/or a combination of direct current and alternating current. The rotor is configured to rotate about a motor axis MA in response to current, such as direct current or alternating current signals, through the stator. In some examples, the rotor can rotate about the stator such that motor28is an outer rotator motor. In some examples, the rotor can rotate within the stator such that motor28is an inner rotator motor.

Pinion drive30is connected to the motor28to be rotated by the rotor. In some examples, pinion drive30is formed separate from and connected to the rotor. As discussed in more detail below, pinion drive30can be formed as a pinion cap that is separate from the rotor and connected to the rotor. Pinion drive30does not extend through motor28or overlap with the stator along the motor axis MA. Instead, pinion drive30extends from the rotor and away from the stator. Pinion drive30is not overhung. Instead, pinion drive30is supported by multiple bearings, such as a first bearing on a first side of a gear teeth section of pinion drive30and a second bearing on a second side of the gear teeth section of pinion drive30. The second bearing can be disposed between the gear teeth of pinion drive30and the rotor along motor axis MA. Pinion drive30is disposed coaxially with motor28such that pinion drive30rotates on motor axis MA coaxial with rotor.

Drive assembly24is connected to motor28to be powered by motor28. In the example shown, drive assembly24is connected to pinion drive30to receive the rotational output from the motor28by pinion drive30. Drive assembly24receives a rotational output from motor28and converts that rotational output into a linear input along pump axis PA. For example, drive assembly24can be formed by an eccentric crank that is rotatably driven by motor28through pinion drive30. Drive assembly24can be connected to pump frame44to be supported by the pump frame44.

Drive assembly24is connected to fluid displacer36to drive reciprocation of fluid displacer36along pump axis PA. As illustrated inFIG.1B, motor axis MA is disposed transverse to pump axis PA. More specifically, motor axis MA can be orthogonal to pump axis PA. In other embodiments, motor28and fluid displacer36can be oriented in the same axial direction such that motor axis MA and pump axis PA are disposed parallel. Depending on the number of gear stages and connection with pinion drive30, some examples can include motor axis MA and pump axis PA that are coaxial.

Fluid displacer36is configured to reciprocate within a pump body38to pump the spray fluid. For example, the fluid displacer36can be formed as a piston that reciprocates within a cylinder of the pump body38. In some examples, the pump26is configured as a double displacement pump that outputs spray fluid during both a first stroke as fluid displacer36moves in a first axial direction along pump axis PA and a second stroke as fluid displacer36moves in a second, opposite axial direction along pump axis PA. Fluid displacer36reciprocates along pump axis PA to pump spray fluid from reservoir14to spray gun18.

During operation, the user can maneuver fluid displacement assembly20to a desired position relative the target substrate by moving support12. For example, the user can maneuver fluid displacement assembly20by tilting system frame32on wheels34and rolling fluid displacement assembly20to a desired location. In some examples, a handle can extend from fluid displacement assembly20and the user can maneuver fluid displacement assembly20within a job site or between job sites by grasping the handle and carrying fluid displacement assembly20. Displacement pump26is fluidly connected to reservoir14, such as by an intake line extending from pump26or by pump26extending into the spray fluid within reservoir14. Motor28provides the rotational input to drive assembly24by pinion drive30. Drive assembly24converts the rotating motion to linear motion and provides linear input to fluid displacer36to cause reciprocation of fluid displacer36. Fluid displacer36draws the spray fluid from reservoir14, pressurizes the spray fluid, and drives the spray fluid downstream through supply line16to spray gun18.

The user can manipulate spray gun18by grasping the handle40of the spray gun18, such as with a single hand of the user. The user causes spraying by actuating trigger42. For example, actuating trigger42can cause a valve disposed within the body of the spray gun18to shift to an open state to open a flowpath for release of the pressurized fluid as a spray from spray gun18. In some examples, the pressure generated by fluid displacement assembly20is sufficient to atomize the spray fluid exiting spray gun18to generate the fluid spray. In some examples, spray gun18is an airless spray gun that does not include a flow of air to facilitate pressurization of the fluid or shaping of the resultant spray pattern.

In some examples, rotational output assembly22is removably mountable to the pump frame44. For example, a first rotational output assembly22, including a first motor28and pinion drive30, can be removed by first axial movement along the motor axis MA, then a second rotational output assembly, including a second motor28and pinion drive30, can be mounted by second axial movement along the motor axis MA opposite the first axial movement. The first motor can be the same configuration as or different from the second motor. The first pinion drive can be the same configuration as or different from the second pinion drive.

Of particular note concerning the examples discussed in herein is that the pinion drive30replaces a conventional pinion. An outer rotor cannot use a conventional pinion. In conventional drive motors, a rotor rotates within the stator, instead of the rotor70rotating radially around a stator as shown. Moreover, in the conventional drive motors, a pinion shaft extends through the motor, including the rotor, such that the pinion shaft overlaps radially with the electromagnetics of the motor. In the present examples, no shaft extends entirely axially through the motor28, whether part of the pinion or not. In the example shown, first end wall72of rotor70is closed such that no component extends fully through the first end wall72. In this case, a pinion drive is mounted onto an outer rotor, the pinion drive30including the gear teeth section86having teeth for interfacing with the teeth of the drive gear94. The pinion drive30does not extend through the motor28. Rather, the pinion drive30is only connected with an outer housing of the rotor70. The pinion drive30is supported by dual pinion bearings46a,46bon opposite ends of the pinion drive30, with a third section (e.g., the gear teeth section86in the example shown) being between the between pinion ends84a,84bsupported by the pinion bearings46a,46b.

Components can be considered to radially overlap when the components are disposed at a common position along an axis (e.g., along the motor axis MA) such that a radial line projecting that axis extends through each of those radially-overlapped components. Components can be considered to axially overlap when the components are disposed at common positions spaced radially from the axis (e.g., relative to motor axis MA) such that an axial line coaxial with or parallel to the axis extends through each of those axially-overlapped components.

Motor28is an electric motor such that rotation of rotor70is caused by electric power provided to the stator. Motor28can be formed as a reversible motor in that rotor70can be rotatably driven in either of two rotational directions about the motor axis MA (clockwise or counterclockwise). In the example shown, rotor70is formed as a housing having a first end wall72and a second end wall74at opposite axial ends of the rotor housing.

Rotor70includes a rotor body76that extends axially between the first end wall72and the second end wall74. Rotor body76is cylindrical in the example shown. First and second end walls72,74extend substantially radially inward from rotor body76and towards motor axis MA. Rotor body76and/or first end wall72and/or second end wall74can have fins that extend outward to increase a surface area of rotor70to facilitate cooling of motor28. First end wall72and rotor body76are formed as a single casting in the example shown. It is understood, however, that first end wall72can be connected to rotor body76in any desired manner, such as by welding, fasteners, press-fitting, etc. In the example shown, motor28is formed such that rotor70rotates about a stator, as shown in more detail inFIGS.4A and4B. The motor28shown is formed as an outer rotator. It is understood, however, that other examples of motor28are formed as an inner rotator, in which the rotor is disposed radially within the stator.

Pinion drive30is disposed at a first end of rotational output assembly22. The first end of rotational output assembly22is the output end at which the rotational output is provided to other components supported by pump frame44. In the example shown, pump frame44is connected to a second end of rotational output assembly22, the second end is opposite the first end along the motor axis MA. Pinion drive30is disposed at an axially opposite end of motor28from brace plate56of pump frame44. Pinion drive30is mounted to rotor70to rotate in a 1:1 relationship with the rotor70. In the example shown, pinion cap78is mounted to stud82to form pinion drive30. Stud82is connected to rotor70. In the example shown, stud82is mounted to first end wall72of rotor70. Spline88of stud82interfaces with rotor70such that rotor70transmits torque to stud82through the splined interface between stud82and rotor70. Post90projects axially outward from spline88and away from rotor70along the motor axis MA.

Rotational output assembly22is configured as a high torque, low speed assembly. In some examples, rotational output assembly22is configured to generate torque up to about 160 newton-meters (Nm) and provide rotational outputs at speeds up to about 1200 revolutions per minute (rpm). In some examples, rotational output assembly22is configured to generate torque up to about 80 newton-meters (Nm) and provide rotational outputs at speeds up to about 600 revolutions per minute (rpm). In the example shown, stud82is connected to rotor70by rotor70being cast over the spline88of stud82. For example, rotor70can be formed from a lighter-weight material, such as a metal, such as aluminum, while stud82can be formed from a heavier, more durable material, such as a metal, such as steel. The splined interface provides sufficient surface area between the first material forming rotor70and the second material forming stud82to facilitate rotor70transmitting torque without experiencing excessive loading. Stud82is formed from the more durable metal to facilitate stud82transmitting torque to pinion cap78by one or more interfaces having smaller interface contact surface area than the interface between stud82and rotor70when taken in a plane normal to the motor axis MA. For example, pinion cap78can be secured to stud82by one or more threaded interfaces. The material forming stud82is able to handle the loads generated at those interfaces. Post90extends axially outward from spline88away from rotor70. Post90is not overcast by the material forming rotor70. The durable material forming stud82is exposed along post90prior to pinion cap78being mounted on post90. Post90is not enclosed within rotor70.

Pinion cap78is connected to rotor70to be rotated by rotor70. In the example shown, pinion cap78is indirectly connected to rotor70by stud82that connects pinion cap78to rotor70. Pinion cap78is connected to stud82at post90. In the example shown, pinion cap78is directly connected to stud82by the interface between pinion cap78and stud82and indirectly connected to stud82by the interface between fastener80and stud82. In the example shown, pinion cap78is directly connected to stud82by a threaded interface between pinion cap78and post90. Specifically, pinion cap78includes a bore formed in second pinion end84b.The bore in the pinion cap78includes internal threading that connects to external threading on post90. As such, pinion drive30can be connected to stud82by interfaced threading.

Fastener80further connects pinion cap78to stud82. Fastener80can be a bolt, among other options. Fastener80extends fully through pinion cap78, through first pinion end84a,the gear teeth section86of pinion cap78, and second pinion end84b,to connect pinion cap78to stud82. The fastener80includes external threads that interface with internal threads formed in a stud bore extending into post90. As such, pinion cap78is connected to stud82by a dual threaded interface in the example shown. The connection between pinion cap78and stud82is configured to prevent loosening of pinion cap78from rotor70. For example, the threaded interface between pinion cap78and stud82can be formed in a first configuration (e.g., one of a left-hand and right-hand thread) and the threaded interface between fastener80and stud82can be formed in a second configuration (e.g., the other one of a left-hand and right-hand thread). Having threading in both directions ensures that the connection between the stud82and the pinion cap78is maintained even if the motor28reverses its direction of rotation.

Pinion drive30includes gear teeth section86that forms a toothed section of pinion drive30. The pinion teeth87forming gear teeth section86are axially elongate relative to the motor axis MA. Each tooth can extend parallel to the motor axis MA. The gear teeth section86interfaces with the drive teeth section108of drive gear94such that pinion drive30can drive rotation of drive gear94by that toothed interface. The rotational output assembly22powers pumping by pump26through the toothed interface. The teeth87of pinion drive30that form the gear teeth section86are formed between first pinion end84aand second pinion end84b.As shown, the pinion drive30includes a first pinion end84athat is covered by pinion bearing46aand a second pinion end84bthat is covered by pinion bearing46b,and a gear teeth section86axially between the first pinion end84aand the second pinion end84b.In the example shown, first pinion end84a,second pinion end84b,and gear teeth section86are each formed on the pinion cap78.

The gear teeth section86interfaces with drive teeth section108of drive gear94. First pinion end84ainterfaces with pinion bearing46ato rotationally support pinion drive30. Second pinion end84binterfaces with pinion bearing46bto rotationally support pinion drive30. As such, the gear teeth section86of pinion drive30is disposed axially between pinion bearings46a,46bwith rotational output assembly22mounted to pump frame44. Pinion bearing46ais supported by retainer plate54. Pinion bearing46bis supported by support frame52. Specifically, pinion bearing46bis supported by mount plate64of support frame52.

In the example shown, pinion bearing46ais smaller than pinion bearing46b.The relative sizing of pinion bearing46aand pinion bearing46bfacilitates spray system10forming a modular spray system that allows for removal and replacement of rotational output assembly22without removing other components of fluid displacement assembly20, as discussed in more detail below. In the example shown, pinion drive30is disposed coaxially with rotor70on motor axis MA such that pinion drive30rotates on a rotational axis that is coaxial with a rotational axis of rotor70.

Rotational output assembly22is supported on the pump frame44. Specifically, pinion drive30is rotationally coupled to pump frame44by pinion bearings46a,46band motor28is coupled to pump frame44at a static interface. Pinion bearings46a,46bmechanically connect rotor70to pump frame44, via pinion drive30. In the example shown, pinion bearings46a,46bmechanically connect rotational output assembly22to both retainer plate54and support frame52. Pinion bearings46a,46bsupport loads from both rotor70and pinion drive30.

Control panel50is disposed on an opposite axial side of rotor70from pinion drive30along the rotational axis MA of rotor70. Control panel50is mounted at the second end of rotational output assembly22. Control panel50can include and/or support a controller and various other control and/or electrical elements of spray system10. The controller is operably connected to the motor28, electrically and/or communicatively, to control operation of motor28thereby controlling pumping by displacement pump26. The controller can be of any desired configuration for controlling pumping by displacement pump26and can include control circuitry and memory. The controller is configured to store software, store executable code, implement functionality, and/or process instructions.

Pump frame44supports other components of fluid displacement assembly20. Pump frame44supports pump26, drive assembly24, and rotational output assembly22. Pump frame44reacts forces generated during rotation by components of rotational output assembly22and generated by reciprocation and driving of the spray fluid by fluid displacer36. Pump frame44is mechanically coupled to rotational output assembly22at a dynamic interface and a static interface. In the example shown, pump frame44interfaces with pinion drive30at the dynamic interface. Specifically, pump frame44interfaces with pinion drive30by pinion bearings46a,46b.Pump frame44interfaces with motor28at the static interface, as best seen inFIGS.4A and4B.

In the example shown, support frame52is mechanically coupled to rotational output assembly22at a dynamic interface by pinion bearings46a,46binterfacing with pinion drive30. Base plate62of support frame52extends horizontally from mount plate64and below rotor70. Base plate62extends to radially overlap with rotor70. Mount plate64extends away from base plate62. Mount plate64can be considered to extend vertically from base plate62. Motor28is connected to pump frame44such that motor28is supported above base plate62of support frame52. In the example shown, mount plate64projects from base plate62and is formed integrally with base plate62such that mount plate64and base plate62form a unitary support component.

Brace plate56is disposed on an opposite axial side of motor28from mount plate64along motor axis MA. Brace plate56is connected to motor28to support motor28. The static interface between pump frame44and rotational output assembly22can be formed between brace plate56and motor28. Brace plate56can be connected to support frame52, such as by fasteners connecting brace plate56to base plate62of support frame52.

Connectors60extend between and connect mount plate64and brace plate56. In the example shown, connectors60are formed as elongate rods that extend between and connect mount plate64and brace plate56. The elongate rods can be rigid to facilitate force transmission. Connectors60are formed such that open spaces are formed circumferentially between different ones of connectors60and circumferentially between connectors60and base plate62. The open spaces facilitate airflow over rotor70, providing cooling to motor28.

Retainer plate54is connected to support frame52, such as by fasteners. Retainer plate54opposes and can abut mount plate64. For example, both retainer plate54and mount plate64can include flat wall surfaces that interface with each other to at least partially enclose a gear chamber between retainer plate54and mount plate64, as discussed in more detail below. The gear chamber can be formed by and between retainer plate54and mount plate64. The toothed interface between pinion drive30and drive gear94can be formed and disposed within the gear chamber.

Drive housing58is connected to retainer plate54. Pump26is supported by drive housing58. For example, pump body38, which can be formed as a cylinder among other options, can be connected to drive link housing58by a clamp, among other connection options. Pump26can be inserted into drive link housing58by shifting pump26laterally through pump opening68in drive link housing58. The pump26can shift radially relative to the pump axis PA to mount to drive link housing58.

Drive assembly24is configured to receive rotational output from rotational output assembly22and generate a linear reciprocating motion that drive assembly24inputs to pump26to power pumping by pump26. Drive assembly24can also be referred to as a drive. Pinion drive30interfaces with drive gear94to provide a rotational input to drive assembly24. Drive gear94is mounted to eccentric92to drive rotation of eccentric92. The drive gear94is fixed to the eccentric92so that the eccentric92rotates 1:1 with the drive gear94. Drive gear94includes a greater number of teeth than pinion drive30. Drive gear94has a larger diameter than pinion drive30. The toothed interface provides a gear speed reduction such that drive gear94rotates at a reduced rotational speed relative to the rotation speed of pinion drive30. Drive gear94completes only a partial rotation for every full rotation by pinion drive30.

Drive gear94is mounted to eccentric shaft104of eccentric92. Eccentric92is supported by drive bearings48a,48b.Drive bearing48ais supported by retainer plate54. Drive bearing48bis supported by support frame52. Specifically, drive bearing48bis supported by mount plate64of support frame52. Drive bearing48ais larger than drive bearing48b.In the example shown, pinion bearing46ais a smallest one of the pinion bearings46a,46band drive bearings48a,48b.Pinion bearing46bis a largest one of the pinion bearings46a,46band drive bearings48a,48b.The drive bearings48a,48bare intermediately sized relative to the pinion bearings46a,46b.

Eccentric driver106is disposed at an end of eccentric92. Eccentric driver106is disposed at a free end of eccentric92and on an opposite side of retainer plate54from drive gear94. Eccentric driver106is disposed to rotate around the rotational axis of drive gear94. Specifically, eccentric driver106rotates offset from the center of rotation of the rest of the eccentric92. Follower bearing102is disposed over eccentric driver106. Follower bearing102is disposed between eccentric driver106and follower98. Follower bearing102allows eccentric driver106to rotate relative to follower98. Follower98is connected to eccentric driver106such that eccentric driver106can cause vertical displacement of follower98relative to the pump axis PA. Follower98is connected to drive link96such that movement of follower98causes displacement of drive link96relative to pump axis PA.

Drive link96is connected to follower98by drive pin100. Drive link96extends into drive housing58through drive link opening66in drive housing58. Pump26can be mounted to and dismounted from drive housing58by moving radially through pump opening68relative to the pump axis PA of pump26. Pump26can be connected to drive housing58such that pump26is supported by pump frame44, such as by pump body38being clamped to drive housing58. The fluid displacer36of pump26is connected to drive link96at a location within drive housing58such that reciprocation of drive link96causes reciprocation of the fluid displacer36. Follower98and follower bearing102are mounted on the eccentric driver106to follow a circular pattern that moves drive link96up and down along the pump axis PA, which reciprocates the fluid displacer36of pump26along the pump axis PA for pumping.

FIG.4Ais a cross-sectional view of fluid displacement assembly20.FIG.4Bis an enlarged cross-sectional view of detail B inFIG.4A.FIGS.4A and4Bare discussed together. Supply line16, spray gun18, and fluid displacement assembly20of spray system10are shown.

Rotational output assembly22, drive assembly24, pump26, pump frame44, pinion bearings46a,46b,drive bearings48a,48b,and control panel50of fluid displacement assembly20are shown. Pump frame44supports rotational output assembly22. Rotational output assembly22is mounted to pump frame44at dual mechanical interfaces formed between rotational output assembly22and pump frame44. In the example shown, rotational output assembly22is mounted to pump frame44at a dynamic interface and a static interface.

Rotational output assembly22is mounted to pump frame44by the dynamic interface. Pump frame44supports the rotational output assembly22at the dynamic interface such that loads can be transmitted through the dynamic interface (e.g., from rotational output assembly22to pump frame44). The dynamic interface is formed at a first end110of rotational output assembly22. The dynamic interface supports the rotational output assembly22on pump frame44while allowing rotating components of rotational output assembly22to rotate relative to the pump frame44. In the example shown, the dynamic interface is formed between pinion drive30and pump frame44. Pinion drive30is supported on pump frame44by pinion bearings46a,46b.

Rotational output assembly22is mounted to pump frame44by the static interface. The static interface is formed such that loads can be transmitted through the static interface from rotational output assembly22to pump frame44. In the example shown, the static interface is formed between pump frame44and motor28. The static interface supports the rotational output assembly22such that a non-moving component of rotational output assembly22interfaces with pump frame44at the static interface. The static interface is formed at a second end112of rotational output assembly22. The electromagnetic components of motor28are, at least partially, disposed axially between the locations of the dynamic interface and the static interface.

Pump frame44is connected to system frame32that mounts pump frame44to a support surface, such as a ground surface on a jobsite. Pump frame44and system frame32form a support12that supports fluid displacement assembly20. In the example shown, wheels34are connected to the system frame32portion of support12.

Support frame52can form one or more of the components of pump frame44that are connected to the system frame32. In some examples, support frame52is the only component of pump frame44directly connected to the system support. Pump frame44supports rotational output assembly22and reacts loads to system frame32to facilitate operation of rotational output assembly22.

Pump frame44is mechanically connected to rotational output assembly22at the second end112of rotational output assembly22to support rotational output assembly22. In the example shown, brace plate56is connected to the portion of axle116extending axially outward through the opening in second end wall74. Brace plate56is connected to base plate62and to connectors60. For example, brace plate56can be connected to both base plate62and connectors60by fasteners, among other connection types.

Support frame52is connectable to rotational output assembly22and drive assembly24to support rotational output assembly22and drive assembly24. Support frame52can be directly connected to a supporting frame, such as system frame32of support12. In the example shown, base plate62is unitary with mount plate64. Base plate62extends between and connects brace plate56to mount plate64. With base plate62formed unitary with mount plate64, base plate62can be considered to form a unitary connector between brace plate56and mount plate64. Base plate62projects from mount plate64in second axial direction AD2such that base plate62radially overlaps with motor28. In the example shown, base plate62overlaps fully the electromagnetic components of motor28(e.g., windings of stator114and permanent magnets140of rotor70).

Brace plate56is connected to base plate62and mount plate64. Brace plate56is directly connected to base plate62, such as by fasteners. Brace plate56is connected to mount plate64by connectors60that extend between and connect to brace plate56and mount plate64. Brace plate56is further connected to mount plate64by base plate62. Brace plate56interfaces with motor28to support motor28. Specifically, brace plate56interfaces with a portion of axle116projecting outward from rotor70and stator114.

Connectors60extend between brace plate56and mount plate64. Connectors60further connect brace plate56and mount plate64. Connectors60are formed as rods, in the example shown. Connectors60can be rigid and configured to transmit loads between brace plate56and support frame52. In the example shown, connectors60are formed as rigid rods that connect brace plate56and mount plate64such that forces reacting loads can be transmitted through connectors60. Motor28is captured axially between mount plate64and brace plate56. Motor28is captured such that motor28is suspended above base plate62and suspended within a motor chamber formed axially between mount plate64and brace plate56and defined circumferentially around the motor28by base plate62and connectors60.

Mount plate64is disposed between motor28and gear chamber124. Mount plate64can be considered to form a vertical portion of the support frame52. Plate flange128is an axially extending portion of mount plate64. Plate flange128extends axially relative to motor axis MA. In the example shown, plate flange128extends in first axial direction AD1relative to a base portion of mount plate64. Retainer plate54is connected to support frame52. Specifically, retainer plate54is connected to mount plate64. A face of retainer plate54interfaces with a face of mount plate64. The faces can be flat surfaces. The faces interface to radially enclose the gear chamber124about the motor axis MA. Retainer plate54can be connected to mount plate64in any desired manner, such as by fasteners (e.g., bolts).

Retainer plate54and mount plate64mate at an interface extending fully about the gear chamber124. Retainer plate54can be connected to support frame52in any desired manner to form the gear chamber124, such as by fastening retainer plate54to support frame52by bolts. The mating interface between retainer plate54and mount plate64extends about the motor axis MA and the drive axis DA of the drive gear94. The gear chamber124has an irregular surface extending around the motor axis MA at the interface between retainer plate54and mount plate64. The irregular surface is formed such that radial lines extending from motor axis MA to the mating interface between retainer plate54and mount plate64that extends about gear chamber124have different lengths when extending in different directions from the motor axis MA. The irregular surface can also include one or more locations located at common radial distances from the motor axis MA.

The gear chamber124is circumferentially closed about the motor axis MA by the interface between retainer plate54and mount plate64. In the example shown, mount plate64includes the plate flange128that extends axially from a vertical plate portion of mount plate64. Plate flange128extends in first axial direction AD1, away from motor28. The plate flange128extends to radially overlap with the toothed interface130formed between pinion drive30and drive gear94. In the example shown, plate flange128extends axially beyond the toothed interface130from the vertical portion of mount plate64such that plate flange128fully radially overlaps the toothed interface130. The interface between retainer plate54and mount plate64is disposed between toothed interface130and the interface between drive link96and pump26. The interface between retainer plate54and mount plate64is disposed axially between the pump26and the motor28, along the motor axis MA. The interface between retainer plate54and mount plate64is formed at a mating interface between flat faces to seal the radial surface of gear chamber124. It is understood that retainer plate54and mount plate64can directly interface (e.g., by direct contact) or indirectly interface (e.g., by a component, such as a seal, spacer, etc., disposed therebetween) to define the gear chamber124.

Pump frame44supports pinion bearings46a,46band drive bearings48a,48b.Pinion opening132extends through the pump frame44from an exterior of pump frame44and into gear chamber124. In the example shown, pinion opening132is formed in mount plate64. Pinion opening132extends fully through mount plate64between an inner axial side of mount plate64(oriented in first axial direction AD1and into gear chamber124) and an outer axial side of mount plate64(oriented in second axial direction AD2and towards motor28).

Drive bore138is formed in mount plate64. In the example shown, drive bore138extends partially through mount plate64. An axial end of drive bore138, opposite the end of the drive bore138at gear chamber124, is closed.

Drive opening136extends through the pump frame44from an exterior of pump frame44and into gear chamber124. In the example shown, drive opening136is formed in retainer plate54. Drive opening136extends fully through retainer plate54between an outer axial side of retainer plate54(oriented in first axial direction AD1toward drive link96and away from motor28and gear chamber124) and an inner axial side of retainer plate54(oriented in second axial direction AD2and towards gear chamber and motor28).

Pinion bore134is formed in retainer plate54. In the example shown, pinion bore134extends partially through retainer plate54. An axial end of pinion bore134, opposite the end of pinion bore134at gear chamber124, is closed.

Pinion opening132can also be referred to as a bearing opening or pinion bore. Drive opening136can also be referred to as a bearing opening or drive bore. Pinion bore134can also be referred to as a bearing chamber or pinion chamber. Drive bore138can also be referred to as a bearing chamber or drive chamber. Pinion opening132, drive opening136, pinion bore134, and drive bore138can each be referred individually to as a bearing bore.

Rotational output assembly22is supported by pump frame44. Rotational output assembly22is disposed on motor axis MA and extends between first end110to second end112. First end110can be considered to form an output end configured to provide a rotational output from motor28. Second end112can be an electrical input end configured to receive electrical power to provide electrical input to stator114to power operation of motor28. For example, electrical wires can extend into motor28through the axle116to connect with stator114and provide power to stator114. In the example shown, rotor70rotates radially around the stator114. As such, motor28is configured as an outer rotator motor. It is understood, however, that in other examples the rotor70can be at least partially disposed within the stator114to rotate within the stator114. Some examples of motor28can thus be formed as an inner rotator motor.

In the example shown, rotor70includes an array of permanent magnets on an inner radial side of rotor body76. Stator114generates electromagnetic fields that interact with a plurality of magnetic elements of rotor70to rotate rotor70about stator114. Electric power is provided to the stator114to cause the stator114to generate magnetic flux, which interacts with the permanent magnets140to drive rotation of rotor70. Motor28can be configured as a dual directional motor28such that rotor70can rotate in either rotational direction relative to the stator114(e.g., either clockwise or counterclockwise when viewed along axis MA in first axial direction AD1).

First end wall72is disposed at a first axial end of rotor70along the motor axis MA. The first end wall72is formed at the output end of rotational output assembly22. In the example shown, first end wall72of rotor70is closed such that no component extends fully through first end wall72. First end wall72is closed such that no rod or other structural support component extends entirely axially through motor28. Second end wall74is disposed at a second axial end of rotor70along the motor axis MA, opposite the first axial end. Second end wall74is formed at the electrical input end of rotational output assembly22. Second end wall74is not closed and includes an opening through which the axle116projects. Second end wall74extends radially inward to axially overlap with the stator114.

The rotor body76extends axially between the first end wall72and the second end wall74. In the example shown, the first end wall72and the rotor body76are unitary and formed as a single component, such as by casting. The second end wall74is separately formed and connected to rotor body76. For example, the second end wall74can be connected to rotor body76by fasteners, adhesive, welding, press-fit, interference fit, or by other forms of connection.

Stator114is disposed within rotor70. In the example shown, stator114is fully disposed within rotor70. Stator114is bracketed axially by first end wall72and second end wall74along motor axis MA. Axle116is partially disposed within rotor70and stator114and extends out of rotor70through second end wall74. The axle116and electromagnetic components of motor28(e.g., windings and permanent magnets140) radially overlap. Axle116extends outward from motor28in second axial direction AD2. Second end wall74includes an opening that is aligned on the motor axis MA and through which the axle116extends. For example, the opening can be a circular opening that is coaxial with the motor axis MA.

Rotor70is rotatably supported by static components of motor28. In the example shown, rotor70is mounted to axle116to rotate about axle116. Specifically, rotor70is mounted to axle116by motor bearings118a,118b.As shown, axle116does not extend through both axial ends of the rotor70. First end wall72is closed such that axle116cannot extend through first end wall72. Second end wall74is open such that axle116can project through second end wall74. Motor bearing118ais at the first axial end of rotor70. In the example shown, a radially inner race of motor bearing118ainterfaces with rotor70and a radially outer race of motor bearing118ainterfaces with axle116. Specifically, the inner race of motor bearing118ainterfaces with a portion of first end wall72extending axially away from gear teeth section86of pinion drive30. Motor bearing118bis at the second axial end of rotor70. A radially inner race of motor bearing118binterfaces with axle116and a radially outer race of motor bearing118binterfaces with rotor70. Specifically, the outer race of motor bearing118binterfaces with second end wall74. In the example shown, at least a portion of motor bearing118ais radially inward of motor bearing118bsuch that motor bearing118ais closer to the motor axis MA than motor bearing118b.Motor bearing118ais smaller than motor bearing118bin the example shown.

Up to the full axial lengths of one or more of the permanent magnets140can be radially overlapped by the stator114. In the example shown, the permanent magnets140are disposed axially between the dynamic interface (between and pinion drive30and pinion bearings46a,46b) and the static interface (between pump frame44and axle116). In the example shown, the full axial length of the permanent magnets140is disposed axially between the dynamic interface and the static interface.

Pinion drive30is disposed at first end110of rotational output assembly22. In the example shown, pinion drive30is formed as an axial-most component of the rotational output assembly22in the first axial direction AD1. Pinion end84aof pinion drive30forms a distal end of rotational output assembly22. Pinion drive30interfaces with pinion bearings46a,46bto form the dynamic interface between rotational output assembly22and pump frame44.

Pinion drive30includes first pinion end84aspaced axially from second pinion end84b.Pinion end84ais formed as a cylindrical surface in the example shown. Pinion end84ais configured to interface with pinion bearing46a,such as the rollers of pinion bearing46a,such that pinion end84ais supported by pinion bearing46a.Pinion end84bis formed as a cylindrical surface in the example shown. Pinion end84bis configured to interface with pinion bearing46a,such as the rollers of pinion bearing46b,such that pinion end84bis supported by pinion bearing46b.Gear teeth section86is disposed axially between the pinion ends84a,84b.

In the example shown, pinion drive30is formed as a pinion cap78mounted on a stud82. The pinion cap78is formed separately from and mounted to rotor70. The stud82is formed separately from and connected to both the rotor70and pinion cap78. Pinion cap78is attached to the rotor70and rotates with the rotor70. Pinion cap78is disposed coaxially with rotor70to rotate on motor axis MA. Pinion drive30is formed such that pinion end84a,pinion end84b,and gear teeth section86are formed by the pinion cap78.

In the example shown, pinion drive30is formed separately from and connected to rotor70. It is understood, however, that other examples can include pinion drive30formed integral with rotor70. In both examples, pinion drive30is supported by pinion bearings46a,46bdisposed on opposite axial sides of the gear teeth section86formed by the pinion teeth87of the pinion drive30.

Pinion cap78is mounted on stud82. Stud82can be formed integral (e.g., contiguous material) with the rotor70or separately from and attached to the rotor70. In the example shown, stud82is connected to first end wall72of rotor70. Stud82can be connected to rotor70by the material forming first end wall72being cast over a portion of stud82. In the example shown, the material of rotor70is cast over spline88of stud82. The post90of stud82extends axially outward from rotor70in first axial direction AD1. The post90is not overcast by the material of rotor70and is instead exposed. Stud bore124extends into post90. In the example shown, stud bore124extends fully through stud82such that a smaller diameter portion can form a vent port that prevents overpressurization within stud bore124and the larger diameter fastener mount portion142receives fastener80. It is understood, however, that some examples of stud bore124extend only partially through stud82. Stud bore124extends coaxial with the motor axis MA. The fastener mount portion142of the stud bore124does not extend into the motor28and does not radially overlap with rotor70.

Stud82is mounted to rotor70such that stud82does not extend into or radially overlap with components of motor28other than first end wall72. Spline88is spaced axially from motor bearing118ain first axial direction AD1. Spline88does not radially overlap with either motor bearing118a,118brelative to the motor axis MA, in the example shown. At least a portion of the radially outer surface of spline88is disposed radially inward of the radially inner side of motor bearing118arelative to the motor axis MA. In some examples, the radially outer surface of spline88is disposed fully radially inward of the radially inner side of motor bearing118arelative to the motor axis MA. As such, some examples of stud82can be formed such that no portion of spline88extends radially outward of the radially inner side of motor bearing118arelative to the motor axis MA. Such examples include a pinion drive30that does not axially overlap with one or more, up to all, of the bearings within motor28(e.g., motor bearings118a,118b) relative to the motor axis MA. Stud82that does not axially overlap with one or both of the motor bearings118a,118brelative to the motor axis MA. Stud82does not extend into or radially overlap with the electromagnetic components of motor28(e.g., the permanent magnets140of rotor70and windings of stator114) relative to the motor axis MA, in the example shown.

Pinion cap78rotates with the rotor70on the motor axis MA. Pinion cap78is coaxial with the rotor70. Pinion cap78is directly connected to the stud82. Pinion cap78is further fixed to the stud82by fastener80. Fastener80can be a bolt that extends within the pinion cap78from the pinion end84aand through pinion end84b.In the example shown, pinion end84ais formed at a first axial end of pinion cap78, pinion end84bis formed at a second axial end of pinion cap78, and gear teeth section86is formed by pinion cap78axially between the pinion ends84a,84b.

Through bore120extends through pinion cap78and facilitates mounting pinion cap78on stud82. In the example shown, through bore120extends fully through pinion cap78. Through bore120includes mounting bore122that forms a radially enlarged portion of through bore120relative to the portion that fastener80passes through. Pinion cap78is mounted to stud82to prevent relative rotation between pinion cap78and rotor70.

In the example shown, the stud82includes external threading that interfaces with internal threading of the pinion cap78. Specifically, the external threading is formed on post90and the internal threading is formed within the mounting bore122portion of the through bore120. The pinion cap78and stud82mate at a threaded interface, which can be referred to as relative cap threading. The orientation of the relative cap threading can be in a first direction (e.g., left-hand threading or right-hand threading). Stud82also includes internal threading within stud bore124. The stud bore124thus forms a receiver of the stud82configured to receive the fastener80. The internal threading of the stud82interfaces with external threading on the end of the fastener80at a threaded interface, which can be referred to as relative fastener threading. The orientation of the relative fastener threading between the stud82and fastener80can be in a second direction opposite of the first direction (e.g., the other one of the left-hand threading and the right-hand threading). Having threaded interfaces formed by threads formed in both directions ensures that the connection between stud82and pinion cap78is maintained even if the motor28reverses direction of rotation. In the example shown, the threaded interface between pinion cap78and stud82radially overlaps with the threaded interface between fastener80and stud82relative to the motor axis MA.

In other examples, pinion cap78is keyed (e.g., hexed) to the stud82instead of a threaded interface to prevent relative rotation even when the rotor70reverses direction. For example, the stud82can include a cross-sectional shape that is non-circular orthogonal to motor axis MA and the chamber of pinion cap78(e.g., mounting bore122) can similarly include a mating cross-sectional shape that is non-circular orthogonal to motor axis MA. The mating non-circular shapes prevent relative rotation between pinion cap78and stud82. For example, the cross-sections can be oval, square, triangular, rectangular, star shaped, or another polygonal shape. Fastener80can extend through pinion cap78to secure pinion cap78to stud82while the non-circular interface prevents loosening and relative rotation. In other examples, pinion cap78can be fixed to stud82by adhesive, welding, etc.

Pinion cap78extends in first axial direction AD1relative to motor28. Pinion cap78extends through pinion opening132formed through mount plate64. Pinion cap78extends fully through the gear chamber124formed between mount plate64and retainer plate54. First pinion end84is disposed in pinion bore134formed in retainer plate54.

Pinion cap78does not extend into motor28. Pinion cap78does not radially overlap with rotor70or stator114relative to the motor axis MA. In the example shown, pinion cap78does not radially overlap with rotor70or stator114relative to the pump axis PA. Pinion cap78does not radially overlap with permanent magnets140relative to the motor axis MA. Pinion cap78does not extend into any portion of rotor70. Pinion cap78does not radially overlap any portion of stud82interfacing with rotor70relative to the motor axis MA. Pinion cap78is spaced axially in first axial direction AD1from motor bearings118a,118band is not disposed between the motor bearings118a,118b.Pinion cap78is located entirely outside of the motor28.

Pinion drive30is supported by pinion bearings46a,46b.In the example shown, the pinion cap78interfaces with the pinion bearings46a,46bon the inner radial sides of the pinion bearings46a,46b.The pinion bearing46ainterfaces with pinion end84a.The pinion bearing46binterfaces with pinion end84b.The outer races of the pinion bearings46a,46binterface with the pump frame44. The pinion bearings46a,46bcan be roller bearings (e.g., needle type bearings), among other options. Pinion bearings46a,46bare supported by and can be captured on pump frame44. In the example shown, pinion bearing46ais supported by retainer plate54and pinion bearing46bis supported by mount plate64.

Pinion bearing46ais disposed in pinion bore134formed in retainer plate54. Pinion end84ainterfaces with and is rotationally supported by pinion bearing46a.Pinion bearing46bis at least partially disposed within pinion opening132formed through the mount plate64. Second pinion end84interfaces with and is rotationally supported by pinion bearing46b.The gear teeth section86of the pinion cap78is disposed between the first pinion end84and the second pinion end84. The pinion teeth87form the gear teeth section86and are formed in an array that extends circumferentially about pinion cap78. In this way, the pinion cap78includes the exterior gear teeth section86disposed axially between pinion bearing46aand pinion bearing46bwith rotational output assembly22mounted to pump frame44.

Pinion cap78does not extend into motor28. Stud82does not extend into motor28. Pinion drive30does not extend into the motor28. Pinion cap78does not radially overlap with any portion of the rotor70or stator114relative to the motor axis MA. Motor28does not includes a shaft that extends from within the motor28to outside of the motor28to interface with drive gear94. No portion of pinion drive30or pinion cap78interfaces with or radially overlaps with the motor bearings118a,118brelative to the motor axis MA. Motor28does not include an overhung pinion. Motor28does not include a straddle mounted pinion that projects from a shaft that extends within the motor28. Pinion drive30and pinion cap78do not interface with, extend into, or radially overlap (relative to the motor axis MA) with either of motor bearings118a,118b,such that loads generated by pump26are not transmitted to motor bearings118a,118bthrough pinion drive30or pinion cap78. The configuration of rotational output assembly22thereby isolates motor28from the reciprocation forces, decreasing wear, and increasing the operational life of motor28.

Pinion bearings46a,46bare supported on two housing components (retainer plate54and mount plate64) that are not components of the motor28itself. Pinion bearings46a,46bare supported by pump frame44. The pinion bearings46a,46bare not disposed within the motor28. Pinion bearings46a,46bdo not radially overlap with components of the rotor70or stator114relative to the motor axis MA. Pinion bearings46a,46bcan support both dynamic motor loads and the pump reaction forces generated by reciprocation of fluid displacer36during pumping. The pinion bearings46a,46bare isolated from the motor28such that loads experienced by the pinion bearings46a,46bare not transmitted to the components of motor28, thereby isolating those components, such as motor bearings118a,118b,from loads generated by pump26and transmitted to gear train formed by pinion drive30and drive gear94.

Pinion bearings46a,46bare the only rotational support components that support rotational output assembly22on pump frame44. In the example shown, pinion bearings46a,46bare the only two bearings supporting the rotational output assembly22on the pump frame44. The motor bearings118a,118bare disposed within motor28and do not directly interface with the pump frame44. Instead, the motor bearings118a,118binterface with rotor70and axle116, which axle116extends out of rotor70to interface with pump frame44. The pinion bearings46a,46bare the only components of fluid displacement assembly20that interface with both pump frame44and rotational output assembly22.

The exterior gear teeth section86of pinion cap78engages drive teeth section108of drive gear94. The toothed interface130between pinion cap78and drive gear94is formed within a gear chamber124. An axial length of the toothed interface130is defined by the one of drive gear94and pinion drive30formed with a shorter axial tooth length. In the example shown, the pinion teeth87forming gear teeth section86are axially longer than the drive teeth109forming drive teeth section108. Such a configuration facilitates mounting and dismounting of rotational output assembly22on pump frame44and forming the toothed interface130between pinion drive30and drive gear94to facilitate force transmission. Gear teeth section86engages with the full axial length of drive teeth section108. The longer teeth of gear teeth section86facilitates alignment between gear teeth section86and drive teeth section108during mounting and subsequent operation of rotational output assembly22.

Gear chamber124is formed between retainer plate54and mount plate64. The pinion teeth87of gear teeth section86intermesh with the drive teeth109of drive teeth section108such that rotation of pinion cap78drives rotation of drive gear94. In the example shown, rotor70can rotate in both rotational directions, such that both circumferential sides of each tooth experiences wear, rather than only one side experiencing wear. Such distributed wear facilitates increased operational life for drive assembly24and rotational output assembly22.

The drive teeth section108of drive gear94has a larger diameter relative to the rotational axis of drive gear94than a diameter of the gear teeth section86of pinion cap78relative to a rotational axis of pinion cap78. Drive gear94thus rotates with pinion cap78but at a slower rate due to the gear reduction between the pinion cap78and the drive gear94.

Pinion end84bof pinion cap78interfaces with pinion bearing46bwithin pinion opening132through mount plate64. Pinion end84binterfacing with pinion bearing46bencloses the pinion opening132through mount plate64between gear chamber124and an exterior of pump frame44. Enclosing the gear chamber124inhibits flow of contaminants to the toothed interface130between gear teeth section86and drive teeth section108. Pinion bearing46bis disposed axially between gear teeth section86and rotor70such that the pinion opening132disposed axially between the toothed interface130and the rotor70is sealed by pinion bearing46band pinion drive30.

Drive assembly24is supported by pump frame44. Specifically, drive assembly24is connected to and supported by retainer plate54and mount plate64. Drive gear94is supported by eccentric92. The drive gear94is fixed to the eccentric92so that the eccentric92rotates 1:1 with the drive gear94. Specifically, drive gear94is mounted to eccentric shaft104of eccentric92. A first end of eccentric shaft104extends in first axial direction AD1from drive gear94. The first end of eccentric shaft104extends through drive opening136in retainer plate54to project out of the gear chamber124. A second end of eccentric shaft104extends in second axial direction AD2from drive gear94. The second end of eccentric shaft104extends into drive bore138formed in mount plate64. The drive bore138is closed at an axial end opposite the end of the drive bore138through which the eccentric shaft104extends into the drive bore138.

The eccentric92is supported by drive bearings48a,48b,which can also be roller bearings (e.g., needle type bearings), similar to pinion bearings46a,46b.The drive bearings48a,48brotatably support eccentric92and drive gear94. The drive bearings48a,48bare supported by pump frame44. Specifically, drive bearing48ais supported by retainer plate54and drive bearing48bis supported by mount plate64. Drive bearing48ais disposed within the drive opening136through retainer plate54and interfaces with eccentric shaft104to support eccentric92and drive gear94. Drive bearing48bis disposed within the drive bore138within mount plate64and interfaces with eccentric shaft104to support eccentric92and drive gear94.

The end of eccentric shaft104extending out of gear chamber124interfaces with drive bearing48awithin drive opening136through retainer plate54. The eccentric shaft104interfacing with drive bearing48aencloses the openings through retainer plate54between gear chamber124and an exterior of pump frame44. Enclosing the gear chamber124inhibits flow of contaminants to the toothed interface130between gear teeth section86and drive teeth section108. It is understood that gear chamber124can be considered to be enclosed, in some examples, even where a small bore extends through pump frame44between the gear chamber124and the exterior of the pump frame44. For example, one or more vent openings can extend through the retainer plate54and mount plate64. In the example shown, the vent opening is radially offset from the rotational axis of the drive gear94and the motor axis MA. The vent opening is on an opposite radial side of the toothed interface130from the pinion drive30, relative to the motor axis MA. The vent opening is radially further from the motor axis MA than the toothed interface130and the eccentric92.

The toothed interface130is formed at a location axially between the first drive bearing48aand the second drive bearing48brelative to the motor axis MA, and axially between the first pinion bearing46aand the second pinion bearing46brelative to the motor axis MA. The intermediate location of the toothed interface130relative to the drive bearings48a,48band pinion bearings46a,46bbalances loads transmitted through that toothed interface130and facilitates transfer of those loads to the pump frame44. At least one drive bearing48a,48bis disposed on an opposite axial side of the toothed interface130from at least one pinion bearing46a,46b(e.g., drive bearing48aand pinion bearing46b). In the example shown, drive bearing48aand pinion bearing46aare disposed on a same first axial side of the toothed interface130while drive bearing48band pinion bearing46bare disposed on a same second axial side of the toothed interface130. The first axial side is opposite the second axial side, taken along the motor axis MA.

Drive bearing48ais disposed to radially overlap with pinion bearing46arelative to the motor axis MA. Drive bearing48bis disposed to radially overlap with pinion bearing46brelative to the motor axis MA. The radially overlapping configurations of drive bearings48a,48band pinion bearings46a,46bprovides for a compact drive system. The radially overlapping drive bearings48a,48band pinion bearings46a,46bfurther facilitate counteracting the pump load generated by reciprocation of fluid displacer36to pump the fluid.

In the example shown, the pinion bearing46bis larger than the drive bearing48a,the drive bearing48ais larger than the drive bearing48b,and the drive bearing48bis larger than the pinion bearing46a.Drive bearings48a,48band pinion bearings46a,46bare disposed with a cross-wise configuration. One example of a cross-wise configuration includes the larger bearing of each bearing set disposed on an opposite axial side of the toothed interface130and are disposed on different rotational axes (e.g., drive bearing48aand pinion bearing46b). Another example of a cross-wise configuration includes the smaller bearing of each bearing set disposed on an opposite axial side of the toothed interface130and disposed on different rotational axes (e.g., drive bearing48band pinion bearing46b). The example shown includes a dual cross-wise configuration of drive bearings48a,48band pinion bearings46a,46b.The crosswise positioning of the larger and smaller bearings supporting eccentric92and pinion cap78facilitates balancing the pump loads generated by reciprocation of fluid displacer36, reducing wear on the drive bearings48a,48band pinion bearings46a,46band providing for increased operational life.

The cross-wise bearings configurations further facilitate mounting and dismounting of rotational output assembly22and drive assembly24on pump frame44. For example, rotational output assembly22can be pulled in second axial direction AD2away from mount plate64. Pinion drive30is disengaged from pinion bearings46a,46bwhile pinion bearings46a,46bremain captured on pump frame44. Drive assembly24and retainer plate54can be pulled in first axial direction AD1away from mount plate64. Eccentric shaft104disengages from drive bearing48bas drive assembly24is pulled in first axial direction AD1. Drive bearing48bremains captured on mount plate64. Drive bearing48aand pinion bearing46aremain captured on retainer plate54as drive assembly24is removed from pump frame44.

Eccentric92includes eccentric driver106formed on a portion of eccentric92on an opposite axial side of retainer plate54from drive gear94. The eccentric driver106rotates offset from the center of rotation of the rest of the eccentric92. The eccentric driver106rotates offset from and around the rotational axis DA of the drive gear94. Follower98and follower bearing102are mounted on the eccentric driver106to follow a circular pattern that moves drive link96up and down along pump axis PA. Fluid displacer36, which is formed as a piston in the example shown, is connected to drive link96to be driven in a reciprocating manner by drive link96. Reciprocating fluid displacer36causes pumping by pump26. In the example shown, the pump26is formed as a double displacement pump that outputs spray fluid during a first pump stroke in a first direction along the pump axis PA and outputs spray fluid during a second pump stroke in a second direction along the pump axis PA opposite the first direction along the pump axis PA.

Fluid displacement assembly20provides significant advantages. Pinion drive30is connected to rotor70to receive the rotational output from motor28and rotates coaxially with rotor70. Pinion drive30is formed separately from rotor70and is supported by pinion bearings46a,46b.Pinion cap78mechanically connects motor28to pump frame44at the first end110of rotational output assembly22, which is the output end of rotational output assembly22.

Pinion drive30and pinion bearings46a,46bare disposed to counteract pump reaction forces and transmit those pump reaction forces to pump frame44, thereby protecting motor28from experiencing the pump reaction forces. The gear teeth section86is disposed axially between the pinion bearings46a,46b.Loads are transmitted to the pinion drive30at a location axially between the pinion bearings46a,46bto be counteracted by the pinion bearings46a,46b.Pinion cap78is mounted to stud82to prevent loosening and relative rotation (e.g., by the dual directional threading). Stud82is formed from a harder and more durable material than first end wall72of rotor70that stud82is connected to. The durable material of stud82facilitates transmitting torque through the threaded interface between stud82and pinion cap78.

FIG.5is an enlarged cross-sectional view of fluid displacement assembly20showing rotational output assembly22exploded away from pump frame44. Pump frame44, rotational output assembly22, drive assembly24, pinion bearings46a,46b,pump26, and drive bearings48a,48bof fluid displacement assembly20are shown.

Pump frame44is configured to support rotational output assembly22to facilitate rotational output assembly22powering pumping by the pump26via drive assembly24. Rotational output assembly22is mountable to and dismountable from pump frame44such that rotational output assembly22can be dismounted from pump frame44for repair or maintenance. The same or a different rotational output assembly22can then be mounted to pump frame44to power drive assembly24. Rotational output assembly22can be mounted to and dismounted from pump frame44without breaking the connection between components of pump frame44defining gear chamber126. Rotational output assembly22is mountable to the pump frame44by movement of the rotational output assembly22in first axial direction AD1along the motor axis MA. Rotational output assembly22is dismountable from the pump frame44by movement of the rotational output assembly22in second axial direction AD2opposite the first axial direction AD1.

In some examples, drive assembly24can be mountable to and dismountable from pump frame44such that drive assembly24can be dismounted from pump frame44for repair or maintenance. The same or a different drive assembly24can be mounted to pump frame44to connect with pinion drive30to receive the rotational output from pinion drive30.

The dynamic and static interfaces between rotational output assembly22and pump frame44support the rotational output assembly22relative to the pump frame44to react rotational loads and pump reaction forces. The forces are transmitted to pump frame44and through pump frame44to the ground or other support surface. The dynamic interface is formed at a first end110of rotational output assembly22. The static interface is formed at a second end112(best seen inFIG.4B) of rotational output assembly22.

The toothed interface130between drive gear94and pinion drive30is formed in gear chamber126. Pump frame44defines the gear chamber126. The toothed interface130between rotational output assembly22and drive assembly24is enclosed within gear chamber126. Gear chamber126is formed axially between retainer plate54and mount plate64relative to the motor axis MA. A portion of gear chamber126between retainer plate54and mount plate64is shown. Pinion opening132is formed fully through mount plate64. Drive opening136is formed fully through retainer plate54. Drive bore138is formed in mount plate64. Pinion bore134is formed in retainer plate54.

Pinion opening132extends through the pump frame44from an exterior of pump frame44and into gear chamber126. In the example shown, pinion opening132is formed through the mount plate64and provides an opening allowing access to gear chamber126. Pinion opening132extends fully through mount plate64. Pinion bore134is formed in retainer plate54. Pinion bore134provides a space for receiving portions of rotational output assembly22. In the example shown, pinion bore134extends partially through retainer plate54, though it is understood that not all examples are so limited.

Pinion bearings46a,46bare supported by pump frame44. Pinion bearings46a,46bare captured by pump frame44. Pinion bearings46a,46bare captured by pump frame44such that pinion bearings46a,46bremain mounted to and supported by pump frame44even when rotational output assembly22is dismounted from pump frame44.

Pinion bearing46ais supported by pump frame44. Pinion bearing46ais at least partially disposed within pinion bore134. Pinion bearing46ais captured within pinion bore134such that pinion bearing46aremains mounted to pump frame44while rotational output assembly22is dismounted from pump frame44and during mounting and dismounting of rotational output assembly22on pump frame44. Pinion bearing46bis supported by pump frame44. Pinion bearing46bis at least partially disposed within the pinion opening132. Pinion bearing46bis captured within pinion opening132such that pinion bearing46bremains mounted to pump frame44when rotational output assembly22is dismounted from pump frame44and during mounting and dismounting of rotational output assembly22on pump frame44.

Pinion bearing46ais aligned with pinion bearing46bon a pinion bearing axis PDA. The pinion bearing axis PDA is coaxial with the motor axis MA during mounting and dismounting of the rotational output assembly22. Pinion drive30and portions of motor28of rotational output assembly22are shown. Rotor70is rotatably mounted to axle116at a first axial end of motor28by motor bearing118a.Pinion drive30is connected to rotor70to receive a rotational output from rotor70. Pinion drive30is configured to interface with pinion bearings46a,46bto form the dynamic connection between rotational output assembly22and pump frame44. The dynamic interface structurally supports rotational output assembly22on pump frame44while facilitating transmission of the rotational output to drive assembly24by pinion drive30. In the example shown, pinion drive30is the component of rotational output assembly22that forms the dynamic interface. As such, motor28does not directly interface with pump frame44at the dynamic interface.

In the example shown, the dynamic interface is breakable such that the rotational output assembly22can be mounted to and dismounted from pump frame44. The dynamic interface is breakable by axial movement of the rotational output assembly22along the motor axis MA in second axial direction AD2. The breakable nature of the dynamic interface allows the same or different ones of the rotational output assembly22to be mounted to the same pump frame44and drive assembly24.

In the example shown, the outer diameter BD2pinion bearing46bis larger than the outer diameter BD3drive bearing48a,the outer diameter BD3drive bearing48ais larger than the outer diameter BD4of drive bearing48b,and the outer diameter BD4of drive bearing48bis larger than the outer diameter BD1of pinion bearing46a.The crosswise positioning of the larger and smaller bearings supporting eccentric92and pinion drive30facilitates balancing of the pump loads generated by reciprocation of fluid displacer36, reducing wear on the drive bearings48a,48band pinion bearings46a,46band providing for increased operational life.

An outer diameter BD1of pinion bearing46ais smaller than a minor diameter MD1of the pinion cap78at gear teeth section86. The minor diameter MD1is taken at the base of the trench formed between adjacent ones of the pinion teeth87forming the gear teeth section86. An outer diameter BD2of pinion bearing46bis larger than a major diameter MD2of the pinion cap78at the pinion teeth of gear teeth section86. The major diameter MD2is taken at the tips of the teeth87forming gear teeth section86. The relative sizing of the pinion bearings46a,46band gear teeth section86facilitates mounting and dismounting of rotational output assembly22on pump frame44by axial movement along the motor axis MA.

The outer diameter OD1of pinion end84ais smaller than the outer diameter OD2of pinion end84b.The outer diameter OD1of pinion end84ais smaller than the minor diameter MD2of the gear teeth section86. The outer diameter OD2of pinion end84bis larger than the major diameter MD2of the gear teeth section86. The relative sizing of the pinion drive30facilitates the axial mounting of rotational output assembly22. The outer diameter OD1and major diameter MD2are both smaller than outer diameter OD2such that pinion end84aand gear teeth section86can pass through pinion bearing46band pinion opening132without engaging with pinion bearing46b.

During mounting, the rotational output assembly22is aligned with pinion bearings46a,46b.The motor axis MA is oriented coaxial with the pinion bearing axis PDA. Pump drive assembly24initially enters into pump frame44through pinion opening132. Pump drive assembly24shifts axially through pinion opening132in the first axial direction AD1. Pinion end84apasses through pinion bearing46band into gear chamber126. Gear teeth section86passes through pinion bearing46band into gear chamber126. Pinion end84aand gear teeth section86can pass through the pinion bearing46bby solely axial movement without contacting the pinion bearing46b.

Rotational output assembly22continues to shift in the first axial direction AD1such that pinion end84aenters into engagement with pinion bearing46a.Pinion end84apasses into pinion bore134and engages with pinion bearing46a.Gear teeth section86shifts into engagement with drive gear94to form the toothed interface130(best seen inFIG.4B). The projecting teeth109of the drive gear94pass into the trenches formed between adjacent teeth of the pinion drive30.

The teeth109of drive teeth section108have an axial length TL1and the teeth87of gear teeth section86have a second axial length TL2. The axial length TL1of the drive gear teeth109is shorter than axial length TL2of the pinion drive teeth87. The tooth length TL1is taken along a portion of drive gear94in which the drive teeth109have a common height along their length. The tooth length TL2is taken along a portion of pinion drive30in which the pinion teeth87have a common height along their length. The length TL2is greater than the length TL1such that the pinion teeth87are axially elongate relative to the drive teeth109. The pinion teeth87and drive teeth109are axially elongate relative to the motor axis MA.

Gear teeth section86engages with drive teeth section108by an interface formed between the pinion teeth87and drive teeth109. Pinion drive30continues to shift in first axial direction AD1with gear teeth section86and drive teeth section108engaged. Pinion end84aenters into and engages with pinion bearing46a.The gear teeth section86continues to shift axially in first axial direction AD1such that an axial end of the gear teeth section86passes beyond an axial end of the drive teeth section108. The drive teeth section108thus fully radially overlaps with gear teeth section86relative to motor axis MA. The dynamic interface can thereby be formed by sliding axial engagement between the gear teeth section86of pinion drive30and drive teeth section108of drive gear94.

The pinion drive30mounts such that the pinion teeth87forming gear teeth section86extends axially beyond drive teeth section108in both the first axial direction AD1and second axial direction AD2. The toothed interface130is thus formed between pinion drive30and drive gear94. Gear teeth section86engages with the full axial length of drive teeth section108. The longer teeth of gear teeth section86facilitates alignment between gear teeth section86and drive teeth section108during mounting of rotational output assembly22. The longer axial teeth of gear teeth section86balances the load transfer between pinion drive30and drive gear94, providing a longer operational life and preventing wear on gear teeth section86.

During mounting, pinion end84bshifts in first axial direction AD1and engages with pinion bearing46bwithin pinion opening132. Pinion end84bengages with pinion bearing46bsuch that pinion end84bis supported on pump frame44by pinion bearing46b.Rotational output assembly22is dynamically supported by pump frame44with pinion end84aengaging pinion bearing46aand pinion end84bengaging pinion bearing46b.Pinion bearings46a,46bare an only two bearings supporting the rotational output assembly22on the pump frame44, in the example shown.

Pinion end84bmoving into engagement with pinion bearing46bencloses gear chamber126. Pinion end84bengaging pinion bearing46bencloses the openings through mount plate64and between an exterior of pump frame44and gear chamber126.

In some examples, the brace plate56can be mounted on axle116prior to mounting rotational output assembly22to pump frame44. Connectors60can be connected to brace plate56and project axially relative to brace plate56prior to mounting rotational output assembly22on pump frame44. Mounting motor28can thus include passing pinion drive30into engagement with pinion bearings46a,46bto form the dynamic interface and connecting connectors60and brace plate56to support frame52to secure the static interface.

Rotational output assembly22is fully mechanically supported by pump frame44with the dynamic interface and static interface formed between the rotational output assembly22and the pump frame44. With rotational output assembly22supported on pump frame44, motor28can be connected to power and operated to cause pumping by pump26. As discussed above, rotational output assembly22can be configured to rotate in either rotational direction on motor axis MA. Driving pump26by rotating rotor70in opposite rotational directions balances wear on the drive teeth109of drive teeth section108of drive gear94and on the pinion teeth87of the gear teeth section86of pinion drive30. The teeth of drive gear94and pinion drive30can experience wear on both circumferential sides of each tooth, providing increased operational lifespan by distributing the wear.

Rotational output assembly22is dismountable from pump frame44by axial shifting of rotational output assembly22in second axial direction AD2. The static interface can be broken. For example, the static interface can be broken by disconnecting portions of pump frame44from other portions of pump frame44. For example, brace plate56can be disconnected from base plate62and from connectors60. In some examples, connectors60can be disconnected from mount plate64. Rotational output assembly22is pulled in second axial direction AD2off of pump frame44to disengage the toothed interface130and dismount rotational output assembly22.

Pinion drive30is connected to rotor70such that pinion drive30moves axially with rotor70during both mounting and dismounting of rotational output assembly22. During dismounting, pinion drive30moves with motor28such that pinion end84ashifts out of engagement with pinion bearing46a.Pinion drive30moves with motor28such that pinion end84bshifts out of engagement with pinion bearing46b.Pinion drive30moves with motor28such that gear teeth section86shifts axially in second axial direction AD2relative to drive teeth section108while the toothed interface130is maintained. The pinion teeth87slide relative to the drive teeth109. The toothed interface130can be sized such that the toothed interface130is maintained even with the interface between pinion bearing46aand pinion end84abroken and with the interface between pinion bearing46band pinion end84bbroken. The toothed interface130can be maintained with the dynamic bearing interfaces broken due to the axial length TL2of the teeth of pinion drive30. For example, the tooth length TL2can be longer than an axial length AL1of pinion end84aand can be longer than an axial length AL2of pinion end84b.

During dismounting, rotational output assembly22is pulled in second axial direction AD2such that gear teeth section86and pinion end84apass axially through pinion opening132band pinion bearing46b.Pinion end84apasses axially relative to drive gear94such that pinion end84aradially overlaps with drive teeth section108during at least a portion of the mounting process and at least a portion of the dismounting process. Rotational output assembly22is pulled in second axial direction AD2such that pinion drive30is removed from gear chamber126and disconnected from pump frame44.

With rotational output assembly22dismounted from pump frame44, the same or a different rotational output assembly22can be mounted to pump frame44to power drive assembly24and pumping by pump26. For example, the first rotational output assembly22can be shifted in second axial direction AD2to dismount the first rotational output assembly. A second rotational output assembly22can be shifted in first axial direction AD1to mount the second rotational output assembly22to the pump frame44. The second rotational output assembly22can be the same as or different from the first rotational output assembly22.

Similar to rotational output assembly22, drive assembly24can be mounted to and dismounted from pump frame44. Drive assembly24can be mounted to and dismounted from pump frame44while rotational output assembly22remains mounted to pump frame44. Retainer plate54can be disconnected from mount plate64, such as by removing fasteners. Retainer plate54, including the captured pinion bearing46aand drive bearing48a,can be pulled in first axial direction AD1and off of support frame52. Drive gear94and eccentric92move with retainer plate54. An end of eccentric shaft104is pulled axially out of drive bearing48bto disconnect from drive bearing48b.Drive bearing48bremains captured by mount plate64within drive bore138. Drive assembly24is thus disconnected from support frame52.

Drive assembly24can be mounted by shifting in second axial direction AD2such that the end of eccentric shaft104shifts into and engages with drive bearing48b.Pinion bearing46apasses over pinion end84aand engages with pinion end84a.Retainer plate54is connected to mount plate64to enclose gear chamber126. For example, retainer plate54can be connected to mount plate64by fasteners. Drive assembly24can thereby be dismounted to allow for mounting of a same or different drive assembly24.

Fluid displacement assembly20provides significant advantages. Rotational output assembly22can be mounted to pump frame44and dismounted from pump frame44as a unitary assembly. Rotational output assembly22can be dismounted from pump frame44by solely axial movement of the rotational output assembly22relative to pump frame44, along the motor axis MA. Similarly, rotational output assembly22can be mounted to pump frame44by solely axial movement of the rotational output assembly22relative to pump frame44, along the motor axis MA. The mounting arrangement provides for simple and quick mounting of rotational output assembly22on pump frame44. The mounting arrangement allows for rotational output assembly22go be quickly and easily removed for access and servicing or for replacement. The mounting arrangement decreases downtime, thereby reducing costs.

Pinion bearings46a,46bare captured by pump frame44such that pinion bearings46a,46bremain mounted on pump frame44when rotational output assembly22is dismounted. Pinion bearings46a,46bbeing captured on pump frame44reduces the part count as multiple different rotational output assemblies can be mounted to the same set of pinion bearings46a,46b.Pinion bearings46a,46bbeing captured by pump frame44protects pinion bearings46a,46bfrom contaminants. Pinion bearing46ais fully within gear chamber126and pinion bearing46bis disposed in pinion opening132such that pinion bearings46a,46bare shielded from contaminants, which pinion bearings46a,46bmay otherwise be exposed to the contaminants if pinion bearings46a,46bare secured to pump drive assembly24to move with pump drive assembly24.

The engagement between gear teeth section86and drive teeth section108formed and broken as a sliding interface during mounting and dismounting. The engagement can help align pinion drive30on pinion bearing axis PDA. The mounted and dismounted teeth87forming gear teeth section86are axially longer than the teeth109forming drive teeth section108that remain supported by pump frame44during mounting and dismounting of rotational output assembly22. The axially longer teeth of the gear teeth section86facilitates alignment during mounting and provides balanced loading between drive gear94and pinion drive30.

FIG.6Ais an isometric view of fluid displacement assembly20′ with retainer plate54removed to expose portions of pinion drive30and drive assembly24.FIG.6Bis an enlarged cross-sectional view along line B-B showing a portion of the dynamic interface between the pump frame44and rotational output assembly22.

The fluid displacement assembly20′ shown inFIGS.6A-6Bis similar to the fluid displacement assembly20(FIGS.2-5) previously shown and discussed. The examples are similar to each other and any detail referenced in connection with one example either is present in the other example or can be present in the other example. As such, all aspects between examples can be assumed to be the same unless shown and/or described to be clearly different such that the descriptions and drawings for one example are applicable to the other example. Various common aspects are not repeated between examples for brevity.

Components having the same reference numbers can be the same such that descriptions and/or drawings for one component can be imputed to another component, having the same reference number, of a different example. Likewise, components having the same name can be the same such that descriptions and/or drawings for one component can be imputed to another component, having the same name, of a different example.

In the example shown, pinion drive30is formed as a pinion cap78that is mounted to stud82′. In the example shown, stud82′ is contiguous with the rest of the rotor housing (e.g., formed from the same piece of metal). For example, stud82′ can be formed integrally with first end wall72during casting of components of rotor70, rather than being overcast during casting of rotor70. In the example shown, first end wall72of rotor70includes a first projection extending in first axial direction AD1and a second projection extending in second axial direction AD2. The first projection forms stud82′ that interfaces with pinion cap78. The second projection forms a bearing surface that interfaces with an inner radial side of motor bearing118a,relative to motor axis MA, to support rotor70on motor bearing118a.

Pinion cap78is mounted on the stud82′ to form the pinion drive30. In the example shown, pinion drive30does not include the fastener80extending through pinion drive30and interfacing with stud82′. As such, the pinion cap78is mounted without the use of a bolt. In some examples, pinion cap78can be removably mounted to stud82′, such as by interfaced threading. In other examples, pinion cap78can be permanently connected to stud82′, such as by welding, adhesive, press-fitting etc. In some examples, the mounting bore122of pinion cap78can be contoured and the outer surface of stud82′ can be similarly contoured such that the mating interface between pinion cap78and stud82′ prevents relative rotation therebetween. While pinion cap78is shown as not mounted by a (e.g., fastener80), it is understood that some examples of stud82′ include a threaded bore such that a fastener80can threadedly connected to stud82′ to further mount pinion cap78to stud82′.

FIG.7is an isometric view of stud82. Stud82includes spline88, post90, and stud bore124. Spline88is formed by projections144and notches146and includes outer radial surface148. Post90extends axially from spline88. Spline88is configured to interface with a portion of rotor70to connect stud82to rotor70for simultaneous rotation. The splined interface provides sufficient surface area between the first material forming rotor70and the second material forming stud82to facilitate rotor70transmitting torque without experiencing excessive loading. Stud82is formed from the more durable metal to facilitate stud82transmitting torque to pinion cap78by one or more interfaces having smaller interface contact surface area than the interface between stud82and rotor70when taken in a plane normal to the motor axis MA.

The outer radial surface148of spline88varies in distance from the motor axis MA circumferentially about spline88due to projections144and notches146. Projections144extend radially away from a base of spline88. Projections144increase the area of the outer radial surface148to facilitate torque transfer. Notches146are formed between adjacent ones of the projections144. The material forming rotor70is cast into notches146to form a tight mechanical fit between stud82and rotor70. Post90extends axially outward from spline88away from rotor70. Post90is not overcast by the material forming rotor70. The durable material forming stud82is exposed along post90.

Stud bore124extends into post90. Stud bore124includes fastener threads150within the stud bore124. The fastener threads150are configured to mate with the threads on fastener80at a threaded interface to connect fastener80and stud82. Cap threads152are formed on an exterior of post90. Cap threads152are configured to mate with threads on pinion cap78to connect pinion cap78and stud82. Cap threads152and fastener threads150can be oriented in opposite directions about the stud82to form a dual directional threaded interface.

Stud82facilitates torque transfer from the motor28to pinion cap78to power pumping by a pump. Stud82being formed from a more reliant material than the body of the rotor, decreasing weight and costs as compared to casting rotor70from the material forming stud82. Spline88provides increased surface area relative to a smooth outer radial surface148and defines notches146to capture the cast material, providing a strong mounting interface between stud82and rotor70. The dual directional threaded interface of the stud82facilitates mounting and retention of the pinion cap78and prevents loosening if rotor70reverses rotational direction.

Discussion of Non-Exclusive Examples

The following are non-exclusive descriptions of possible examples of the present invention(s).

A fluid pumping assembly includes an electric motor having a stator and a rotor comprising a rotor housing and configured to rotate on a motor axis; a pinion cap formed separate from and attached to the rotor housing, the pinion cap comprising a gear teeth section; a drive gear that interfaces with the gear teeth section at a toothed interface; an eccentric that receives rotational motion from the drive gear; and a pump that receives reciprocating motion from the eccentric.

The rotor rotates about the stator.

The pinion cap does not radially overlap with the stator.

The pinion cap does not radially overlap with any magnets of the rotor.

The pinion cap is located entirely outside of the motor.

No rod extends entirely axially through the motor.

The pinion cap includes a first pinion end that interfaces with a first pinion bearing and a second pinion end that interfaces with a second pinion bearing, and wherein the gear teeth section is located between the first pinion end and the second pinion end.

The eccentric includes an eccentric shaft on which the drive gear is mounted, the eccentric shaft supported by a first eccentric bearing and a second eccentric bearing.

The first eccentric bearing radially overlaps with the first pinion bearing and the second eccentric bearing radially overlaps with the second pinion bearing.

The second pinion bearing is larger than the first eccentric bearing, the first eccentric bearing is larger than the second eccentric bearing, and the second eccentric bearing is larger than the first pinion bearing.

The second pinion bearing is disposed axially between the gear teeth section and the rotor housing.

The first eccentric bearing is disposed on an opposite axial side of the toothed interface from the second pinion bearing, and wherein the second eccentric bearing is disposed on an opposite axial side of the toothed interface from the first pinion bearing.

A stud on which the pinion cap is mounted, the stud extending away from the rotor housing.

The stud includes a spline interfacing with the rotor housing and a post extending axially from the spline and away from the rotor housing.

A fastener extending through the pinion cap and connected to the stud by a first threaded interface between the fastener and the stud.

The pinion cap is mounted on the stud by a second threaded interface between the pinion cap and the stud.

The first threaded interface has a first thread direction, the second threaded interface has a second thread direction, and the first thread direction differs from the second thread direction.

A bolt that extends through the pinion cap to fix the pinion cap with respect to the rotor housing.

A stud on which the pinion cap is mounted, the stud extending away from the rotor housing. The bolt extends into the stud and radially overlaps with the stud and the pinion cap.

The pinion cap is fixed relative to the rotor by a first threaded interface and the fastener is fixed relative to the rotor by a second threaded interface.

A thread direction is reversed between the first threaded interface and the second threaded interface.

The rotor housing includes an open end that faces away from the pump and a closed end that faces toward the pump.

The pinion cap is mounted to the closed end of the rotor housing.

A hose and gun for spraying of pumped fluid.

The pump is a piston pump.

A fluid pumping assembly includes an electric motor configured to generate a rotational output, the electric motor having a stator and a rotor comprising a rotor housing and configured to rotate on a motor axis, the rotor including a first end wall, a second end wall, and a rotor body therebetween; a stud projecting from the first end wall, the stud projecting in a first axial direction along the motor axis and away from the stator; a pinion cap formed separate from and attached to the rotor, the pinion cap mounted on the stud, the pinion cap including a gear teeth section; a drive interfacing the pinion cap at a toothed interface to receive the rotational output from the electric motor via the pinion cap, the drive configured to convert the rotational output into reciprocating motion; and a pump that receives reciprocating motion from the drive.

The stud is formed separately from and connected to the rotor.

The stud does not extend fully through the first end wall.

The stud does not extend into any motor bearing supporting the rotor relative to the stator.

The stud includes first threading formed in a bore of the stud and second threading formed on an exterior of the stud.

The first threading and the second threading radially overlap.

The stud includes a post projecting axially away from the stator, the first threading is formed within the post and the second threading is formed on an exterior of the post.

The first threading has a first thread direction, the second threading has a second thread direction, and the first thread direction is opposite the second thread direction.

A pump frame, the electric motor supported on the pump frame by a static interface between the pump frame and the electric motor, and the electric motor supported on the pump frame by a dynamic interface between the pump frame and the pinion drive.

The pinion drive is mounted to the pump frame by a first pinion bearing and by a second pinion bearing, the gear teeth section disposed between the first pinion bearing and the second pinion bearing.

The first pinion bearing is supported by a first plate of the pump frame, the second pinion bearing is supported by a second plate of the pump frame, the first plate separate from and connected to the second plate.

The drive includes a drive gear connected to the pinion drive at the toothed interface; and an eccentric connected to the drive gear to rotate with the drive gear, the eccentric connected to the pump to drive reciprocation of a fluid displacer of the pump.

A rotational output assembly configured to power pumping by a pump via a drive, the rotational output assembly including an electric motor having a stator and a rotor comprising a rotor housing and configured to rotate on a motor axis, the rotor including a first end wall, a second end wall, and a rotor body therebetween; a stud projecting from the first end wall, the stud projecting in a first axial direction along the motor axis and away from the stator; and a pinion cap formed separate from and attached to the rotor, the pinion cap mounted on the stud, the pinion cap including a gear teeth section between a first pinion end of the pinion cap and a second pinion end of the pinion cap, the second pinion end disposed between the gear teeth section and the rotor.

The rotor rotates about the stator.

The second end wall includes an opening, and wherein an axle of the motor extends through the second end wall.

The rotor is supported on the axle by motor bearings.

The pinion cap is mounted on the stud by a threaded interface.

The pinion cap is connected to the stud by a fastener engaging the stud.

The pinion cap is mounted to an exterior of the stud by a first threaded interface; a fastener extends through the pinion cap and engages the stud at a second threaded interface; and the first threaded interface has a first thread direction and the second threaded interface has a second thread direction opposite the first thread direction.

The first threaded interface radially overlaps with the second threaded interface.

The stud includes a spline interfacing with the first end wall and includes a post extending axially from the spline and away from the rotor.

A fluid pumping assembly includes an electric motor having a stator and a rotor comprising a rotor housing and configured to rotate on a motor axis; a pinion drive extending axially from the rotor housing and including a first pinion end, a second pinion end, and a gear teeth section disposed between the first pinion end and the second pinion end; a first pinion bearing interfacing with the first pinion end; a second pinion bearing interfacing with the second pinion end; a drive gear that interfaces with the gear teeth section at a toothed interface; an eccentric that receives rotational motion from the drive gear; and a pump that receives reciprocating motion from the eccentric.

A support frame and a retainer plate connected to the support frame; wherein the first pinion bearing interfaces with the retainer plate and the second pinion bearing interfaces with the support frame.

The support frame and the retainer plate define a gear chamber, the toothed interface disposed in the gear chamber.

The pinion drive extends through an opening in the support frame such that the support frame is disposed between the gear tooth section and the rotor.

The second pinion bearing is at least partially disposed in the opening.

The first pinion end extends into a bore in the retainer plate.

The first pinion bearing is at least partially disposed in the bore.

The bore includes a closed axial end.

The second pinion end is disposed between the gear tooth section and the rotor body, and wherein the second pinion bearing is larger than the first pinion bearing.

The eccentric includes an eccentric shaft on which the drive gear is mounted, the eccentric shaft supported by a first eccentric bearing and a second eccentric bearing.

The first eccentric bearing radially overlaps with the first pinion bearing and the second eccentric bearing radially overlaps with the second pinion bearing.

The second pinion bearing is larger than the first eccentric bearing, the first eccentric bearing is larger than the second eccentric bearing, and the second eccentric bearing is larger than the first pinion bearing.

The first eccentric bearing is disposed on an opposite axial side of the toothed interface from the second pinion bearing, and wherein the second eccentric bearing is disposed on an opposite axial side of the toothed interface from the first pinion bearing.

A diameter of the first pinion end is smaller than a minor diameter of the gear tooth section.

An outer diameter of the first pinion bearing is smaller than a minor diameter of the gear tooth section.

A diameter of the second pinion end is larger than a major diameter of the gear tooth section.

An outer diameter of the second pinion bearing is larger than a major diameter of the gear tooth section.

The pinion drive includes a pinion cap formed separately from and connected to the rotor body.

The first pinion bearing is a needle type bearing.

The second pinion bearing is a needle type bearing.

The pinion drive does not include a rod that extends into the motor.

The motor includes a first motor bearing and a second motor bearing rotatably supporting the rotor and disposed within the motor.

The rotor rotates about the stator, the first motor bearing is disposed within the rotor housing, and the second motor bearing is disposed within the rotor housing.

A fluid pumping assembly includes a pump frame; a motor supported by the pump frame and having a rotor and a stator, the rotor supported relative to the stator by at least one motor bearing disposed within the motor such that the rotor rotates on a motor axis; a pinion drive extending axially from a first end of the rotor, a drive gear interfacing with the pinion drive at a toothed interface between the drive gear and a gear teeth section; and an eccentric connected to the drive gear to be rotated by the drive gear. The pinion drive includes a first pinion end interfacing with a first pinion bearing supported by the pump frame; a second pinion end interfacing with a second pinion bearing supported by the pump frame; and the gear teeth section disposed axially between the first pinion end and the second pinion end.

The first pinion end has a first outer diameter, the second pinion end has a second outer diameter, and the first outer diameter is smaller than the second outer diameter.

A minor diameter of the gear teeth section is larger than the first outer diameter.

A major diameter of the gear teeth section is smaller than the second outer diameter.

The second pinion end is disposed between the gear teeth section and the stator.

The gear teeth section includes a plurality of axially elongate teeth.

A first pinion bearing interfacing with the pump frame and the first pinion end to support the first pinion end; and a second pinion bearing interfacing with the pump frame and the second pinion end to support the second pinion end.

A first drive bearing interfacing with the pump frame and the eccentric to support the eccentric; and a second drive bearing interfacing with the pump frame and the eccentric to support the eccentric.

The first drive bearing radially overlaps with the first pinion bearing, and the second drive bearing radially overlaps with the second pinion bearing.

The first pinion bearing is smaller than the second drive bearing, the second drive bearing is smaller than the first drive bearing, and the first drive bearing is smaller than the second pinion bearing.

A fluid pumping assembly includes a pump frame at least partially defining a gear chamber; a drive gear supported by the pump frame; an eccentric that receives rotational motion from the drive gear; a first pinion bearing captured by the pump frame; a second pinion bearing captured by the pump frame; and a rotational output assembly. The rotational output assembly includes an electric motor having a stator and a rotor comprising a rotor housing and configured to rotate on a motor axis; and a pinion drive extending axially from the rotor housing and including a first pinion end, a second pinion end, and a gear teeth section disposed between the first pinion end and the second pinion end, the gear teeth section configured to interface with the drive gear at a toothed interface disposed at least partially within the gear chamber. The rotational output assembly is mountable to the pump frame by movement of the rotational output assembly in a first axial direction along the motor axis, and the rotational output assembly dismountable from the pump frame by movement of the rotational output assembly in a second axial direction opposite the first axial direction.

The pinion drive is disconnectable from the first pinion bearing and the second pinion bearing by relative axial movement such that the first pinion bearing and the second pinion bearing remain mounted on the pump frame with the rotational output assembly dismounted from the pump frame.

The first bearing is smaller than the second bearing.

A first diameter of the first pinion end is smaller than a tooth diameter of the gear tooth section, and the tooth diameter is smaller than a second diameter of the second pinion end.

The tooth diameter is a minor tooth diameter.

The tooth diameter is a major tooth diameter.

The eccentric is mounted on a first drive bearing and a second drive bearing.

The first drive bearing and the second drive bearing are larger than the first pinion bearing.

The first drive bearing and the second drive bearing are smaller than the second pinion bearing.

The first pinion bearing is supported by a first plate of the pump frame and the second pinion bearing is supported by a second plate of the pump frame.

The first pinion bearing is disposed in a bearing chamber formed in the first plate and the second pinion bearing is disposed in a bore through the second plate.

The second pinion bearing is sized such that the first pinion end and the gear tooth section can pass by solely axial movement through the second pinion bearing without contacting the second pinion bearing.

The first plate is fixed to the second plate by fasteners.

The first plate includes a drive bore through which the eccentric fully extends, and wherein the second plate includes a drive bearing chamber extending partially through the second plate and into which the eccentric extends.

The first pinion bearing is a needle bearing and the second pinion bearing is a needle bearing.

A modular pumping assembly includes a pump frame configured to support a displacement pump; a first pinion bearing captured by the pump frame; a second pinion bearing aligned with the first pinion bearing on a pinion support axis, the second pinion bearing captured by the pump frame; and a first rotational output assembly. The first rotational output assembly includes a first electric motor having a first stator and a first rotor comprising a first rotor housing and configured to rotate on a first motor axis; and a first pinion drive extending axially from the first rotor housing and including a first pinion end, a second pinion end, and a first gear teeth section disposed between the first pinion end and the second pinion end, the first gear teeth section configured to output rotational motion from the first rotor at a first toothed interface. The first rotational output assembly is mountable to the pump frame by movement of the first rotational output assembly in a first axial direction along the pinion support axis with the first motor axis disposed coaxial with the pinion support axis. The first rotational output assembly is dismountable from the pump frame by movement of the first rotational output assembly in a second axial direction opposite the first axial direction.

A second rotational output assembly including a second electric motor having a second stator and a second rotor comprising a second rotor housing and configured to rotate on a second motor axis; and a second pinion drive extending axially from the second rotor housing and including a third pinion end, a fourth pinion end, and a second gear teeth section disposed between the third pinion end and the fourth pinion end, the second gear teeth section configured to output rotational motion from the second rotor at a second toothed interface. The second rotational output assembly is mountable to the pump frame by movement of the second rotational output assembly in the first axial direction along the pinion support axis with the second motor axis disposed coaxial with the pinion support axis. The second rotational output assembly is dismountable from the pump frame by movement of the second rotational output assembly in the second axial direction opposite the first axial direction.

The pump frame includes a pinion opening between an exterior of the pump frame and a gear chamber within the pump frame and a pinion bore formed in the pump frame and disposed on an opposite side of the gear chamber from the pinion opening along the pinion axis.

The pump frame is formed from a first plate fastened to a second plate, the pinion bore formed in the first plate and the pinion opening formed in the second plate.

The first rotor is disposed on an opposite side of the second plate from the gear chamber.

The second plate is integrally formed with a base plate that extends to radially overlap with the first rotor with the first rotational output assembly mounted to the pump frame.

A drive gear supported by a shaft, the shaft supported by a first drive bearing supported by the first plate and a second drive bearing supported by the second plate; a drive opening extends fully through the first plate, the first drive bearing mounted in the drive opening; and a drive bore extending into the second plate, the second drive bearing mounted in the drive bore. The first toothed interface is formed between the gear tooth section and the drive gear.

The gear tooth section includes a plurality of pinion teeth, each pinion tooth axially elongate relative to the first motor axis.

The toothed interface is formed by sliding axial engagement between drive gear teeth of the drive gear and the plurality of pinion teeth as the first rotational output assembly is mounted to the pump frame.

The first pinion bearing and the second pinion bearing are an only two bearings supporting the first rotational output assembly on the pump frame.

A diameter of the first pinion end is smaller than a minor diameter of the gear tooth section.

A diameter of the second pinion end is larger than a major diameter of the gear tooth section.

A method of mounting a rotational output generator to a pumping assembly includes aligning a first rotational output assembly with a pump frame such that a rotational axis of the motor is aligned coaxially with a pinion bearing axis through the pump frame; and shifting the first rotational output assembly axially relative to the pinion axis and in a first axial direction to form a dynamic mechanical connection between the rotational output assembly and the pump frame, the first rotational output assembly configured to power pumping by a pump supported by the pump frame.

Shifting the first rotational output assembly such that a pinion drive extending axially from a rotor of an electric motor of the first rotational output assembly passes into engagement with pinion bearings supported by the pump frame, the pinion bearings including a first pinion bearing and a second pinion bearing.

Shifting the first rotational output assembly in the first axial direction such that a first pinion end of the pinion drive and a gear teeth section of the pinion drive pass through the second pinion bearing prior to a second pinion end of the pinion drive engaging the second pinion bearing to rotatably support the pinion drive by the second pinion bearing.

Enclosing a toothed interface between the pinion drive and a drive gear by engaging the second pinion end with the second pinion bearing, the drive gear supported by the pump frame within a gear chamber defined by the pump frame.

Forming a toothed interface between the first rotational output assembly and a drive gear rotatably supported by the pump frame by pinion teeth of the first rotational output assembly sliding axially relative to drive gear teeth of the drive gear along the pinion bearing axis.

Forming a static mechanical connection between the first rotational output assembly and the pump frame.

Forming the static mechanical connection at a second axial end of the electric motor, the pinion drive projecting from a first axial end of the electric motor opposite the second axial end of the electric motor.

Dismounting the first rotational output assembly from the pump frame by shifting the first rotational output assembly in a second axial direction opposite the first axial direction.

Mounting a second rotational output assembly to the pump frame by shifting the second rotational output assembly in the first axial direction to form a second dynamic mechanical connection between the second rotational output assembly and the pump frame, the second rotational output assembly configured to power pumping by the pump.

While the invention(s) has been described with reference to an exemplary embodiment(s), it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention(s) without departing from the essential scope thereof. Therefore, it is intended that the invention(s) not be limited to the particular embodiment(s) disclosed, but that the invention(s) may include all embodiments falling within the scope of the appended claims. Any single feature, or any combination of features from one embodiment show herein, may be utilized in a different embodiment independent from the other features shown in the embodiment herein. Accordingly, the scope of the invention(s) and any claims thereto are not limited to the particular to the embodiments and/or combinations of the features shown herein, but rather can include any combination of one, two, or more features shown herein.