Patent Description:
At present, the lawn care device, for example, the cylinder mower, uses the cylinder cutter as the working part. Through the relative movement of the cylinder cutter and the bottom cutter, the grass clamped between the cylinder cutter and the bottom cutter is cut, thereby realizing the mowing function. The cylinder cutter of the motorized cylinder mower generally adopts chain drive, which is complicated. The cylinder cutter drive of the electric cylinder mower on the market is mostly the same as that of the motorized cylinder mower, and it may alternatively adopt a motor provided on the side of the frame. In addition, as an accessory of the cylinder mower, the cylinder cutter for mowing the lawn can be replaced by a working part for lawn care operations such as root cutting and grass grooming. <CIT> discloses a lawn mower adapted to mow a lawn by rotating a reel blade taking a mowing motor as a driving source. As the mowing motor, an outer rotor motor capable of outputting a low speed high torque is used, and the mowing motor is built in the interior of the reel blade to make a direct drive type. <CIT> discloses a walk-behind greens mower having a mobile structure and a ground engaging traction member rotatably coupled to the mobile structure. The ground engaging traction member imparts traction movement to the mobile structure for movement on the ground at a ground speed. An internal combustion engine is supported on the mobile structure and outputs a driving force to the ground engaging traction member. A bed knife is supported by the mobile structure having a cutting edge that cooperates with a grass cutting reel rotatably supported on the mobile structure. An electric motor supported on the mobile structure rotatably driving the grass cutting reel at a rotational speed that can vary depending upon the detected ground speed. <CIT> discloses a lawn mowing vehicle. The lawn mowing vehicle which includes at least a front lawn mower and a front lawn mower arranged at different positions in the right and left direction of the vehicle relative to the advancing direction, includes: a first lifting and lowering mechanism for lifting and lowering the front lawn mower by an electric cylinder; a second lifting and lowering mechanism for lifting and lowering the front lawn mower by an electric cylinder; and a controller that controls the first and the second lifting and lowering mechanisms and individually lifts and lowers the front lawn mower and the front lawn mower. <CIT> discloses a machining method of grass-cutting hob. The method includes: welding hob blades to cutter heads; placing the hob in a thermal treatment furnace with the temperature in the furnace being <NUM>-<NUM> DEG C for thermal treatment, keeping the temperature for <NUM>-<NUM> hours, taking out the hob, placing into oil for oil quenching for <NUM>-<NUM> minutes, and performing air cooling until the hob reaches room temperature; annealing at <NUM>-<NUM> DEG C, keeping the temperature for <NUM>-<NUM> hours, and naturally cooling to room temperature; grinding the excircle of the hob to allow the outer edges of the hob blades to be located on the same cylindrical surface; meanwhile, grinding the bearing section of a hob shaft to allow the axis of the bearing section to coincide with the rotation axis of the hob blades; grinding the edge back angle alpha of the hob blades; performing sand blasting on the hob, and then performing paint spraying; performing paint baking; grinding the edge point angle beta of the hob blade to complete the machining of the hob. <CIT> discloses an embedded-outer rotor motor direct driven mower driving wheel and a mower. The embedded-outer rotor motor direct driven mower driving wheel comprises a driving wheel main body formed by the assembling of a wheel side cover I, a wheel side cover II, and a wheel body sandwiched between the wheel side cover I and the wheel side cover II, the wheel side cover I, the wheel side cover II and the wheel body are enclosed to define a cavity, an outer rotor motor is mounted in the cavity, an outer rotor portion of the outer rotor motor is fixedly arranged relative to the driving wheel main body, an internal stator portion of the outer rotor motor is provided with a fixed shaft penetrating through the wheel side cover I and extending out of the driving wheel main body, and the wheel side cover I is provided with a shaft hole I allowing the fixed shaft to penetrate through. Namely, in the <CIT>, the outer rotor motor is arranged inside the driving wheel and directly drives the mower driving wheel through the outer rotor motor. <CIT> discloses an electric driven hand operated lawn mower which has motor housing rotating around fixed motor shaft and is provided with spiral shaped blades.

An objective of the present invention is to provide a mowing cylinder cutter driven by a built-in outer rotor motor. The present invention is driven by a built-in outer rotor motor, which simplifies the transmission structure, improves work efficiency, and makes the whole structure compact.

To achieve the above objective, the present invention adopts the following technical solutions:
A mowing cylinder cutter driven by a built-in outer rotor motor includes an outer rotor motor, blades and a reel, where the outer rotor motor includes a stator assembly and an outer rotor; the stator assembly is connected to a frame through a connecting member; and the blades are multiple and spiral. The blades are fixedly connected to the reel through a plurality of support plates, such that there is no direct contact between the reel and the blades; at least one end of the reel is provided with the outer rotor motor, such that the end of the reel is surrounded by the outer rotor motor; and the outer rotor is fixedly connected to the reel and the blades, such that the blades are fixedly connected to both the outer rotor and the reel at the same time.

In an embodiment, the connecting member may be a motor shaft; the reel may be shaped as a hollow straight cylinder or a variable-diameter cylinder; one end or two ends of the reel may be provided with a motor compartment; the motor shaft passes through the reel, and two ends of the motor shaft may extend out of the reel; and the two ends of the motor shaft may be provided with flat positions, and the motor shaft may be fixedly connected to the frame through the flat positions.

In an embodiment, one end of the reel may be provided with an outer rotor motor and a motor compartment; the outer rotor motor may be provided in the motor compartment; and the stator assembly may be circumferentially limited to the motor shaft through a key.

In an embodiment, two ends of the reel may be respectively provided with outer rotor motors and motor compartments; two outer rotor motors may be respectively provided in the corresponding motor compartments; the stator assembly includes a first sleeve and a stator coil; the stator coil may be provided on the first sleeve; and the first sleeve may be provided on the motor shaft and may be circumferentially limited through a key.

In an embodiment, the motor compartment may be a part of the reel; the motor compartment may be provided with an opening facing outward; the outer rotor motor may be provided in the motor compartment from the opening; an end cap may be provided on an outer side of the outer rotor motor; the end cap may be integrally formed with the outer rotor, and may be matched with the motor compartment to seal the outer rotor motor in the motor compartment; a center of the end cap may be provided with a bearing; and the motor shaft may be connected to and passes through the bearing.

In an embodiment, one end or two ends of the reel may be provided with an outer rotor motor; the connecting member includes a second sleeve being hollow and cylindrical; the stator assembly includes a stator coil; the stator coil may be provided on the second sleeve of the connecting member; the second sleeve may be sleeved on the reel and has a gap with the reel; an outer end of the second sleeve and an end of the outer rotor form a radial labyrinth seal; an end of the reel adjacent to an outer side of the second sleeve may be provided with a bearing; the bearing may be provided in a bearing seat; and the bearing seat may be fixedly connected to the second sleeve.

In an embodiment, the bearing seat and the connecting member may be integrally formed; and/or, an inner end of the outer rotor extends axially to the reel; and/or, an outer end of the outer rotor extends radially to form a flange; an outer end surface of the flange may be provided with at least one annular notch; an outer end of the connecting member extends to the flange; an end surface of the connecting member facing the flange may be correspondingly provided with at least one annular lug boss; and the lug boss may be inserted into the notch, such that the outer end of the connecting member and the outer end of the outer rotor form the radial labyrinth seal.

The present invention has the following advantages.

In the mowing cylinder cutter driven by a built-in outer rotor motor provided by the present invention, the outer rotor motor is provided inside the cylinder cutter or the working part, and the cylinder cutter or the working part is driven to rotate through the outer rotor of the motor. The present invention achieves a compact structure and high transmission efficiency. This design avoids additional efficiency loss, and greatly improves the work efficiency. In addition, the direct drive of the outer rotor motor improves the working torque and can cope with a complex working environment.

The present invention is described in further detail below with reference to the drawings and embodiments.

Referring to <FIG> shows a major structure of a mowing cylinder cutter driven by a built-in outer rotor motor according to a first embodiment of the present invention. As shown in <FIG>, the mowing cylinder cutter <NUM> driven by a built-in outer rotor motor includes blades <NUM> and a reel <NUM>. The blades <NUM> are multiple and spiral, and the blades <NUM> are fixedly connected to the reel <NUM> through a plurality of support plates <NUM> respectively. An outer rotor motor <NUM> is provided at one end of the reel <NUM>. The outer rotor motor <NUM> includes a stator assembly <NUM> and an outer rotor <NUM>. The stator assembly <NUM> is connected to a frame (not shown) through a connecting member <NUM>, and the frame may be a frame of a lawn mower. The outer rotor <NUM> is connected to the reel <NUM>.

It should be noted that the connection between the outer rotor <NUM> and the reel <NUM> may be a direct connection, that is, the outer rotor <NUM> is directly connected to the reel <NUM>. It may also be an indirectly connection. For example, the outer rotor <NUM> is connected to the reel <NUM> through the support plate <NUM> or the blade <NUM> or other component connected to the reel <NUM>. Any connection is acceptable as long as the outer rotor <NUM> can drive the reel <NUM> to rotate. The outer rotor motor <NUM> may be provided at one or both ends of the reel <NUM>. That is, the reel <NUM> may be provided with an outer rotor motor <NUM> at only one end, or may be provided with an outer rotor motor <NUM> at each end.

In this embodiment, the blades <NUM>, the reel <NUM> and the support plates <NUM> are fixedly connected by welding. The outer rotor <NUM> is fixedly connected to the blades <NUM> and the reel <NUM> through the support plates <NUM>. Specifically, the outer rotor <NUM> is fixedly connected to the support plates <NUM> through fixing bolts <NUM>, and the blades <NUM> are welded to the support plates <NUM>. Of course, the outer rotor <NUM> may also be directly fixedly connected to the blades <NUM> or the reel <NUM>. The connecting member <NUM> includes a second sleeve <NUM> having a hollow cylindrical shape. The stator assembly <NUM> includes a stator coil provided on the second sleeve <NUM>. The second sleeve <NUM> is sleeved on the reel <NUM> and has a gap with the reel <NUM>. In other words, the reel <NUM> passes through the second sleeve <NUM> and extends, and the reel <NUM> can rotate freely. A bearing <NUM> is provided at an end of the reel <NUM> adjacent to an outer side of the outer rotor motor <NUM>. The bearing <NUM> is provided in a bearing seat <NUM>. The bearing seat <NUM> is fixedly connected to the second sleeve <NUM>. Specifically, the bearing seat <NUM> and the connecting member <NUM> may be integrally formed. The stator assembly <NUM> and the connecting member <NUM> as a whole can be assembled or disassembled from the reel <NUM> simultaneously.

An inner wall of the outer rotor <NUM> is circumferentially inlaid with magnetic steel. An inner end of the outer rotor <NUM> extends axially to the reel <NUM>. Thus, the outer rotor <NUM> forms an end cap on an inner side to prevent an internal component of the outer rotor motor <NUM> from being exposed. In this embodiment, the reel <NUM> includes a large-diameter section <NUM> and a small-diameter section <NUM>. A step <NUM> is formed between the large-diameter section <NUM> and the small-diameter section <NUM>. The inner end of the outer rotor <NUM> extends axially to the step <NUM>, so as to limit the outer rotor motor <NUM>.

Referring to <FIG>, a radial labyrinth seal is formed between the outer end of the connecting member <NUM> and the outer end of the outer rotor <NUM>. Specifically, the outer end of the outer rotor <NUM> extends radially to form a flange <NUM>. An outer end surface of the flange <NUM> is provided with two annular notches <NUM>. An outer end of the connecting member <NUM> extends to the flange <NUM>. An end surface of the connecting member <NUM> facing the flange <NUM> is correspondingly provided with two annular lug bosses <NUM>. The two lug bosses <NUM> are inserted into the two notches <NUM> to form the radial labyrinth seal between the outer end of the connecting member <NUM> and the outer end of the outer rotor <NUM>. It should be noted that there may be one or more than one notch <NUM> and lug boss <NUM>, which is not limited herein. Obviously, the lug boss <NUM> may also be provided on the flange <NUM>, and correspondingly, the notch <NUM> may be provided on the connecting member <NUM>, provided that the radial labyrinth seal can be formed between the outer end of the connecting member <NUM> and the outer end of the outer rotor <NUM>.

In use, two ends of the reel <NUM> can be supported by a bearing assembly. The reel <NUM>, the support plates <NUM>, the blades <NUM> and the outer rotor <NUM> rotate synchronously. The stator assembly <NUM> is fixed to the frame through the connecting member <NUM> to keep still, and the outer rotor <NUM> drives the blades <NUM> to rotate. In this way, the direct drive of the built-in outer rotor motor avoids the efficiency loss of the related transmission mechanism, greatly improves the working efficiency of the cylinder cutter, greatly reduces the noise of the whole machine, and realizes a compact structure.

Referring to <FIG> shows a major structure of a mowing cylinder cutter driven by a built-in outer rotor motor according to a second embodiment of the present invention. As shown in <FIG>, the mowing cylinder cutter <NUM> driven by a built-in outer rotor motor includes blades <NUM> and a reel <NUM>. The blades <NUM> are multiple and spiral. A motor compartment <NUM> is provided at one end of the reel <NUM>. The blades <NUM> are fixedly connected to the reel <NUM> and the motor compartment <NUM> through a plurality of support plates <NUM> respectively. An outer rotor motor <NUM> is provided in the motor compartment <NUM>. The outer rotor motor <NUM> includes a stator assembly <NUM> and an outer rotor <NUM>. The stator assembly <NUM> is connected to a frame through a connecting member <NUM>. The outer rotor <NUM> is fixedly connected to the support plate <NUM> on the motor compartment <NUM> and further fixedly connected to the reel <NUM>.

In this embodiment, the connecting member <NUM> is a motor shaft <NUM>, and the reel <NUM> is shaped as a hollow straight cylinder. The reel <NUM> may also be set as a hollow variable-diameter cylinder if necessary. The motor shaft <NUM> passes through the reel <NUM>, and two ends of the motor shaft <NUM> extend out of the reel. The stator assembly <NUM> is directly circumferentially limited on the motor shaft <NUM> through a key <NUM>. The two ends of the motor shaft <NUM> are provided with flat positions, and the motor shaft is fixedly connected to a frame through the flat positions. Bearings <NUM> are further provided at the two ends of the motor shaft <NUM>, and the bearings <NUM> are respectively provided in bearing seats <NUM>. A bearing seat <NUM> at an end adjacent to one end of the outer rotor motor <NUM> is integrally formed with the outer rotor <NUM>, and a bearing seat <NUM> at an end far away from the outer rotor motor <NUM> is fixedly connected to the reel <NUM>. The outer rotor <NUM> is fixedly connected to the support plate <NUM> at an end of the motor compartment <NUM> by a fixing bolt <NUM>.

In order to ensure the assembly accuracy of the outer rotor motor <NUM>, the outer rotor <NUM> and the bearing seat <NUM> integrally formed there-with are adapted to the shape of the motor compartment <NUM>, and the bearing seat <NUM> at the other end is adapted to the shape of the reel <NUM> to ensure that the overall structure is concentric. In use, the motor shaft <NUM> is fixed to the frame by the flat positions at both ends, and the stator assembly <NUM> is fixed to the motor shaft <NUM> by the key <NUM> and remains stationary. The outer rotor <NUM> is fixedly connected to the support plate <NUM> by a fixing bolt <NUM>, such that the cylinder cutter is driven to rotate by the outer rotor of the motor.

Referring to <FIG> shows a major structure of a mowing cylinder cutter driven by a built-in outer rotor motor according to a third embodiment of the present invention. As shown in <FIG>, the mowing cylinder cutter <NUM> driven by a built-in outer rotor motor includes blades <NUM> and a reel <NUM>. The blades <NUM> are multiple and spiral. Motor compartments <NUM> are provided at two ends of the reel <NUM>. The blades <NUM> are fixedly connected to the reel <NUM> and the motor compartments <NUM> through a plurality of support plates <NUM> respectively. An outer rotor motor <NUM> is provided in each of the motor compartments <NUM>. The outer rotor motor <NUM> includes a stator assembly <NUM> and an outer rotor <NUM>. The stator assembly <NUM> is connected to a frame through the connecting member <NUM>. The outer rotor <NUM> is fixedly connected to the support plate <NUM> on the motor compartment <NUM> and further fixedly connected to the reel <NUM>.

In this embodiment, the connecting member <NUM> is a motor shaft <NUM>, and the reel <NUM> is shaped as a hollow straight cylinder. The reel <NUM> may also be set as a hollow variable-diameter cylinder if necessary. The motor shaft <NUM> passes through the reel <NUM>, and two ends of the motor shaft <NUM> extend out of the reel. The two ends of the motor shaft <NUM> are provided with flat positions, and the motor shaft <NUM> is fixed to a frame through the flat positions. The stator assembly <NUM> includes a first sleeve <NUM> and a stator coil <NUM>. The stator coil <NUM> is provided on the first sleeve <NUM>. The first sleeve <NUM> is provided on the motor shaft <NUM> and is circumferentially limited through a key <NUM> to keep still during use. The stator assembly <NUM> and the motor shaft <NUM> as a whole can be assembled or disassembled from the reel <NUM> simultaneously. The outer rotor <NUM> is fixed to the support plate <NUM> at an end adjacent to the motor compartment <NUM> by a fixing bolt <NUM>. In this way, two outer rotor motors are arranged symmetrically on two sides of the cylinder cutter, which minimizes the influence of the built-in motors on the discharging of grass and realizes the power distribution between the two ends. In addition, under the premise of meeting the requirements of use, this design is more compact than the one-sided design of motor.

In this embodiment, the motor compartments <NUM> and the reel <NUM> are fixed as a whole. Of course, they may also be independent of each other. The motor compartments <NUM> each are provided with an opening toward the outside, and the outer rotor motor <NUM> is provided in the motor compartment <NUM> from the opening. An end cap <NUM> is provided outside the outer rotor motor <NUM>. The end cap <NUM> is integrally formed with the outer rotor <NUM> of the outer rotor motor <NUM>, and is matched with the motor compartment <NUM> to seal the outer rotor motor <NUM> in the motor compartment <NUM>. A center of the end cap <NUM> is provided with a bearing <NUM>, and the motor shaft <NUM> is connected to and passes through the bearing <NUM>.

An embodiment of the present invention further provides a lawn care tool driven by a built-in outer rotor motor for lawn care operations such as root cutting and grass grooming. The lawn care tool driven by a built-in outer rotor motor provided by the present invention is described in detail below with reference to the drawing.

Referring to <FIG> shows a major structure of the lawn care tool driven by a built-in outer rotor motor. As shown in <FIG>, the lawn care tool <NUM> driven by a built-in outer rotor motor provided by this embodiment includes a working part <NUM>, a main shaft <NUM>, a motor shaft <NUM> and an outer rotor motor <NUM>. The main shaft <NUM> is shaped as a hollow cylinder. The motor shaft <NUM> passes through the main shaft <NUM>, and two ends of the motor shaft <NUM> extend out of the main shaft. One end of the main shaft <NUM> is connected to the motor shaft <NUM> through a bearing assembly, and the outer rotor motor <NUM> is located in the main shaft <NUM> and adjacent to the other end of the main shaft <NUM>. The outer rotor motor <NUM> includes a stator assembly <NUM>, an outer rotor <NUM> and two end caps <NUM>. The stator assembly <NUM> is fixedly connected to the motor shaft <NUM>, and the outer rotor <NUM> is fixedly connected to the main shaft <NUM>. The end caps <NUM> and the outer rotor <NUM> are integrally formed, and the end caps <NUM> are connected to the motor shaft <NUM> through bearing assemblies, respectively. The working part <NUM> is fixed to an outer surface of the main shaft <NUM>.

Specifically, the working part <NUM> may be fixedly connected to the outer surface of the main shaft <NUM> through a key. Alternatively, the outer surface of the main shaft <NUM> is spline-shaped, and the working part <NUM> is fixedly connected to the outer surface of the main shaft <NUM> through a spline. The fixing method of the working part <NUM> to the outer surface of the main shaft <NUM> is not limited, as long as the working part can rotate with the main shaft <NUM> to perform a corresponding function. The working part <NUM> may be a root cutting blade or a grass grooming blade, as shown in <FIG>, but the shapes of the root cutting blade and the grass grooming blade are not limited herein. It should be noted that the corresponding working part <NUM> may be replaced according to actual needs, and the specific function and structure of the working part <NUM> are not limited. In addition, the working part <NUM> may be fixedly connected to the outer surface of the main shaft <NUM> at an interval through a spacer sleeve <NUM>, and a fixing sleeve <NUM> is provided at two ends of the main shaft <NUM> for firm locking.

In this embodiment, flat positions are provided at the two ends of the motor shaft <NUM>, and the motor shaft <NUM> is circumferentially fixed to a frame through the flat positions. An outer end cap <NUM> of the outer rotor motor <NUM> is integrally formed with the outer rotor <NUM>, and is fixed to the main shaft <NUM> by a screw <NUM>, such that the outer rotor <NUM> can rotate synchronously with the main shaft <NUM>. In a working state, the motor shaft <NUM> and the stator assembly <NUM> remain stationary. The outer rotor <NUM> drives the root cutting blade or grass grooming blade or other lawn care working part on the main shaft <NUM> to rotate to complete root cutting or grass grooming or other lawn care work.

It should be noted that the bearing assembly in the above embodiment may be a combination of a bearing and a bearing seat, which is a conventional design, and will not be repeated here. The outer rotor motor may be an outer rotor brushless motor, which is not limited herein.

Claim 1:
A mowing cylinder cutter driven by a built-in outer rotor motor, wherein the mowing cylinder cutter (<NUM>) comprises an outer rotor motor (<NUM>), blades (<NUM>) and a reel (<NUM>); the outer rotor motor comprises a stator assembly (<NUM>) and an outer rotor (<NUM>); the stator assembly is connected to a frame through a connecting member (<NUM>); and the blades are multiple and spiral;
characterized in that the blades (<NUM>) are fixedly connected to the reel (<NUM>) through a plurality of support plates (<NUM>), such that there is no direct contact between the reel (<NUM>) and the blades (<NUM>); at least one end of the reel (<NUM>) is provided with the outer rotor motor (<NUM>), such that the end of the reel (<NUM>) is surrounded by the outer rotor motor (<NUM>); and the outer rotor (<NUM>) is fixedly connected to the reel (<NUM>) and the blades (<NUM>), such that the blades (<NUM>) are fixedly connected to both the outer rotor (<NUM>) and the reel (<NUM>) at the same time.