# Patent

## Title
Apparatus and method for axially transferring fluids to a plurality of components

## Abstract

An apparatus for axially transferring fluid may comprise an elongated shaft defining a first fluid passageway axially therethrough and a second fluid passageway from an outer surface thereof to the first fluid passageway. An elongated tube member defines an outer surface that is received within the first fluid passageway and a third fluid passageway axially therethrough. A plurality of axial channels are defined between the tube member and the first fluid passageway or along the tube member separately from the third fluid passageway. At least one of the plurality of axial channels define a first opening near one end thereof that receives fluid from a source of fluid and a second opening axially spaced apart from the first opening and that aligns with the second fluid passageway such that fluid may be transferred by the at least one fluid passageway from the source of fluid through the second fluid passageway.

## Background
RELATED APPLICATIONS
This application is a continuation application of U.S. application Ser. No. 13/099,584, entitled “APPARATUS AND METHOD FOR AXIALLY TRANSFERRING FLUIDS TO A PLURALITY OF COMPONENTS,” which was filed on May 3, 2011 and which is a continuation-in-part of U.S. patent application Ser. No. 12/265,717, filed Nov. 5, 2008, both of which are incorporated herein by this reference in their entirety.


FIELD OF THE INVENTION
The present invention relates generally to structures and techniques for transferring fluids from one or more points to one or more other points along an elongated path, and more specifically to structures and techniques for axially transferring fluids to a plurality of components.
BACKGROUND
It is generally known to control certain types of actuators using pressurized fluid. As one specific example, it is generally known to control friction devices, e.g., clutches, in automatic transmissions using pressurized fluid. It is desirable in such applications to transfer fluid from one or more points in or into an apparatus or system to one or more other points in such an apparatus or system. It is further desirable to axially transfer such fluids in an apparatus or system along an elongated path to a plurality of components of the apparatus or system.
SUMMARY
The present invention may comprise one or more of the features recited in the attached claims, and/or one or more of the following features and combinations thereof. An apparatus for axially transferring fluid may comprise an elongated shaft defining a first fluid passageway axially therethrough and a second fluid passageway from an outer surface thereof to the first fluid passageway. An elongated tube member may define an outer surface and a third fluid passageway axially therethrough. The outer surface of the tube member may be configured to be received within the first fluid passageway of the shaft. A plurality of axial channels may be defined between the tube member and the first fluid passageway or defined by and along the tube member separately from the third fluid passageway. At least one of the plurality of axial channels may define a first opening near one end thereof that receives fluid from a source of fluid and a second opening axially spaced apart from the first opening and that aligns with the second fluid passageway such that fluid can be axially transferred by the at least one fluid passageway from the source of fluid through the second fluid passageway defined through the shaft.
According to another aspect of the present invention, an apparatus for axially transferring fluid includes an elongated shaft defining a first fluid passageway axially therethrough, a second fluid passageway extending through the elongated shaft from an outer surface of the elongated shaft into the first fluid passageway, and an elongated member defining a third fluid passageway axially therethrough. The elongated member is received within the first fluid passageway of the elongated shaft. The apparatus also includes a fourth fluid passageway extending through the elongated shaft from an outer surface of the elongated shaft into the first fluid passageway. The fourth fluid passageway is axially spaced from the second fluid passageway and receives fluid from a source of fluid. The apparatus also includes a plurality of channels defined by and extending axially along the elongated tube member separate from the third fluid passageway or the first fluid passageway between an inner surface of the first fluid passageway and an outer surface of the elongated tube member. One of the plurality of channels defines a first opening near one end thereof that aligns with the fourth passageway and a second opening axially spaced from the first opening that aligns with the second fluid passageway such that fluid can be axially transferred by the one of the plurality of channels from the first opening through the second fluid passageway defined through the elongated shaft.
The apparatus may include a manifold that defines a fifth fluid passageway having one end configured to be fluidly coupled to the source of fluid and an opposite end fluidly coupled to the fourth fluid passageway such that fluid from the source of fluid can flow through the fifth fluid passageway to the at least one of the plurality of channels. At least a portion of the elongated tube member may be received within the manifold. The elongated shaft and/or the elongated tube member may be rotatable relative to the manifold. The manifold may be stationary. The elongated shaft may define a sixth fluid passageway separate from the second fluid passageway and extending through the elongated shaft from an outer surface of the elongated shaft into the first fluid passageway, wherein another one of the plurality of channels defines a first opening near one end thereof that receives fluid from the source of fluid and a second opening axially spaced apart from the first opening of the another one of the plurality of channels that aligns with the sixth fluid passageway such that fluid can be axially transferred by the another one of the plurality of channels from the first opening of the another one of the plurality of channels to one or more components of an automatic transmission through the sixth fluid passageway defined through the elongated shaft. The one or more components of an automatic transmission may include a torque transmitting mechanism coupled to the elongated shaft.
According to another aspect of the present invention, an apparatus for axially transferring fluid includes a first elongated member having an outer surface and an inner surface spaced from the outer surface. The first elongated member defines a first fluid passageway axially therethrough. The apparatus also includes a second elongated member received within the first elongated member and defining a second fluid passageway axially therethrough. The second elongated member also has an outer surface and an inner surface. The inner surface of the first elongated member cooperates with the outer surface of the second elongated member to define a plurality of channels extending longitudinally along at least one of the first and second elongated members. Each of the plurality of channels is located between the outer surface of the first elongated member and the inner surface of the second elongated member. The apparatus also includes a first opening defined in one of the first and second elongated members, which is configured to fluidly couple the apparatus to a fluid source, and a second opening defined in one of the first and second elongated members, which is configured to receive fluid transferred from the first opening through one of the plurality of channels.
The second opening may be configured to fluidly couple the apparatus to one or more components of an automatic transmission. The first and second openings may be defined in the first elongated member. The first opening may be defined in the second elongated member and the second opening may be defined in the first elongated member.
The apparatus may include a fourth fluid passageway coupling the first opening to the fluid source. The fourth fluid passageway may be located within the first fluid passageway. The fourth fluid passageway may be located adjacent the outer surface of the first elongated member. The plurality of channels may be arranged symmetrically or asymmetrically about one of the first and second elongated members. The first and/or the second elongated member may have a substantially circular cross-section or a non-circular cross-section.
A longitudinal portion of the inner surface of the first elongated member may be joined to a longitudinal portion of the outer surface of the second elongated member to define one of the plurality of channels. The apparatus may include an elongated shaft defining a bore therethrough, wherein the first and second elongated members are located within the bore defined by the elongated shaft. In the apparatus, the first elongated member may define a bore therethrough and the second elongated member may be located within the bore defined by the first elongated member.
According to yet another aspect of the present invention, an apparatus for axially transferring fluid includes an elongated shaft defining a first fluid passageway axially therethrough, a second fluid passageway extending through the elongated shaft from an outer surface of the elongated shaft into the first fluid passageway, an elongated member defining a third fluid passageway axially therethrough, the elongated member received within the first fluid passageway of the elongated shaft, a fourth fluid passageway extending through the elongated shaft from an outer surface of the elongated shaft into the first fluid passageway, the fourth fluid passageway being axially spaced from the second fluid passageway, the fourth fluid passageway being configured to receive fluid from a source of fluid, and a plurality of channels defined by and extending axially along one of the elongated tube member separate from the third fluid passageway and the first fluid passageway between an inner surface of the first fluid passageway and an outer surface of the elongated tube member, one of the plurality of channels defining a first opening near one end thereof that aligns with the fourth passageway and a second opening axially spaced from the first opening and that aligns with the second fluid passageway such that fluid can be axially transferred by the one of the plurality of channels from the first opening through the second fluid passageway defined through the elongated shaft.
The apparatus may include a manifold defining a fifth fluid passageway having one end configured to be fluidly coupled to the source of fluid and an opposite end fluidly coupled to the fourth fluid passageway such that fluid from the source of fluid can flow through the fifth fluid passageway to the at least one of the plurality of channels. The elongated tube member or a portion thereof may be received within the manifold. The elongated shaft and/or the elongated tube member may rotatable relative to the manifold. The manifold may be stationary.
The elongated shaft may define a sixth fluid passageway separate from the second fluid passageway and extending through the elongated shaft from an outer surface of the elongated shaft into the first fluid passageway, and another one of the plurality of channels may define a first opening near one end thereof that receives fluid from the source of fluid and a second opening axially spaced apart from the first opening of the another one of the plurality of channels that aligns with the sixth fluid passageway such that fluid can be axially transferred by the another one of the plurality of channels from the first opening of the another one of the plurality of channels to one or more components of an automatic transmission through the sixth fluid passageway defined through the elongated shaft. The one or more components of an automatic transmission may include a torque transmitting mechanism coupled to the elongated shaft.
According to a further aspect of the present invention, an apparatus for axially transferring fluid includes a first elongated member having an outer surface and an inner surface spaced from the outer surface, the first elongated member defining a first fluid passageway axially therethrough, a second elongated member received within the first elongated member and defining a second fluid passageway axially therethrough, the second elongated member also having an outer surface and an inner surface, wherein the inner surface of the first elongated member cooperates with the outer surface of the second elongated member to define a plurality of channels extending longitudinally along at least one of the first and second elongated members, each of the plurality of channels being located between the outer surface of the first elongated member and the inner surface of the second elongated member, a first opening defined in one of the first and second elongated members, the first opening being configured to fluidly couple the apparatus to a fluid source, and a second opening defined in one of the first and second elongated members, the second opening being configured to receive fluid transferred from the first opening through one of the plurality of channels.
The second opening may be configured to fluidly couple the apparatus to one or more components of an automatic transmission. The first and second openings may be defined in the first elongated member. The first opening may be defined in the second elongated member and the second opening may be defined in the first elongated member. The apparatus may include a fourth fluid passageway coupling the first opening to the fluid source. The fourth fluid passageway may be located within the first fluid passageway. The fourth fluid passageway may be located adjacent the outer surface of the first elongated member. The plurality of channels may be arranged symmetrically about one of the first and second elongated members. The plurality of channels may be arranged asymmetrically about one of the first and second elongated members. The first and/or the second elongated members may have a substantially circular cross-section. One or more of the first and second elongated members may have a non-circular cross-section.
A longitudinal portion of the inner surface of the first elongated member may be joined to a longitudinal portion of the outer surface of the second elongated member to define one of the plurality of channels. The apparatus may include an elongated shaft defining a bore therethrough, wherein the first and second elongated members are located within the bore defined by the elongated shaft. The first elongated member may define a bore therethrough and the second elongated member may be located within the bore defined by the first elongated member.



BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a cross-sectional diagram of a portion of an automatic transmission showing one illustrative embodiment of an apparatus for axially transferring fluids along an elongated path to a plurality of transmission components.
FIG. 2 is a cross-sectional view of the apparatus of FIG. 1 as viewed along section lines 2-2.
FIG. 3 is a cross-sectional diagram similar to FIG. 1 and illustrating an alternate embodiment of the tube member illustrated in FIG. 1.
FIG. 4 is a cross-sectional diagram of a portion of an automatic transmission showing an alternative embodiment of an apparatus for axially transferring fluids along an elongated path to a plurality of transmission components.
FIG. 5 is a cross-sectional view of the apparatus of FIG. 4 as viewed along section lines 5-5.
FIG. 6 is a cross-sectional diagram of yet another alternative embodiment of an apparatus for axially transferring fluids along an elongated path to a plurality of components.
FIG. 7 is a cross-sectional view of the elongated path of the apparatus of FIG. 6.
FIG. 8 is a cross-sectional view of the elongated path of FIG. 7 as viewed along section lines 8-8.
FIG. 9 is a cross-sectional view of the tube member illustrated in FIG. 6.
FIG. 10 is a cross-sectional view of the apparatus of FIG. 6 as viewed along section lines 10-10.
FIG. 11 is a cross-sectional diagram of a portion of an automatic transmission showing another alternative embodiment of an apparatus for axially transferring fluids along an elongated path to a plurality of transmission components.



DESCRIPTION OF THE ILLUSTRATIVE EMBODIMENTS
For the purposes of promoting an understanding of the principles of the invention, reference will now be made to a number of illustrative embodiments shown in the attached drawings and specific language will be used to describe the same.
Referring now to FIG. 1, a cross-sectional diagram is shown of a portion of an automatic transmission showing one illustrative embodiment of an apparatus 100 for axially transferring fluids along an elongated path to a plurality of transmission components. In the illustrated embodiment, the elongated path takes the form of a shaft 110 defining a bore 113 therethrough. Between one end 112 of the shaft 110 and a wall portion 115 of the bore 113, the bore 113 defines one diameter 114, and between the wall portion 115 and an opposite end (not shown) of the shaft 110, the bore 113 defines another diameter 116, wherein the diameter 114 is generally larger than the diameter 116. Illustratively, the diameter 114 is sized to accommodate axial insertion of a tube member 120 therein. Along the shaft 110, a number of bores extend through an exterior surface thereof to the bore 113. In the illustrated embodiment, two such bores 118A and 118B are identified. In one embodiment, the shaft forms one component of a transmission for a mobile vehicle, and the bores 118A and 118B each lead to a fluid input of a fluid-controlled friction device, e.g., a friction clutch, although this disclosure contemplates embodiments in which the apparatus 100 is configured to axially transfer fluid to other components. In any case, the shaft 110 is illustratively formed of a conventional metal, combination of metals or a metal composite, although this disclosure contemplates other embodiments in which the shaft 110 is formed of other materials and/or material combinations.
The tube member 120 is an elongated tubular structure that is axially received within the bore 113, e.g., between the end 112 of the shaft 110 and the wall portion 115 as illustrated in FIG. 1. Referring to FIG. 2, a cross-sectional view of one embodiment of the tube member 120 is shown as viewed through section lines 2-2 of FIG. 1. In the illustrated embodiment, the tube member 120 is formed of a conventional hollow, metal tube or bar stock with an inner surface of one tube 124 selectively joined to an outer surface of another tube 122. Generally, the inner surface of the tube 124 has a diameter that is larger than the diameter of the outer surface of the tube 122. In the illustrated embodiment, one portion 126 of the inner surface of the tube 124 is longitudinally joined to and along a corresponding portion of the outer surface of the tube 122, and another portion 128 of the inner surface of the tube 124 is longitudinally joined to and along a corresponding portion of the outer surface of the tube 122. Between the portions 126 and 128, the remaining portions 130 and 132 of the tube 124 and the corresponding portions of the outer surface of the tube 122 define separate, i.e., not fluidly connected, longitudinal or axial channels or passageways 134 and 136 respectively therebetween that extend longitudinally or axially along the tube member 120.
As illustrated in FIG. 1, the ends of the tubes 122 and 124 are circumferentially joined at 144 and 146. In the illustrated embodiment, the ends of the tube 122 and 124 are joined by deforming the opposite ends of the tube 124 toward the corresponding ends of the tube 122 and then joining the ends of the tubes 122 and 124 using one or more conventional joining techniques. In an alternate embodiment of the apparatus 100′ illustrated in FIG. 3, the ends of the tubes 122 and 124 of the tube member 120′ adjacent to the end 112 of the shaft 110 are joined at 146′ by deforming the end of the tube 122 toward the end of the tube 124 and the joining the ends of the tubes 122 and 124 using one or more conventional joining techniques.
The tube member 120 is illustratively formed by selectively bending or pressing the tube 124, and the tubes 122 and 124 may be axially and circumferentially joined using any one or more conventional joining media and/or techniques. Examples include, but are not limited to, welding, spot welding, laser welding, using one or more adhesives and/or conventional fastening members, or the like.
As further illustrated in FIG. 2, the portions 126 and 128 of the outer tube 124 each define an axial channel or passageway 138, 140, respectively, between the corresponding portion 126/128 and the inner diameter 114 of the bore 113 of the shaft 110. The tube member 120 is illustratively press-fit into the bore 113 as illustrated in FIG. 1. In the embodiment illustrated in FIG. 2, fluid may pass between the channels 138, 140, and/or 142. The tube member 120 and shaft 110 cooperate to axially define a number of separate fluid channels or passageways therethrough: the two channels 134 and 136 defined between the tubes 122 and 124, the channels 138 and 140 defined between the tube 124 and the inner diameter 114 of the bore 113 of the shaft 110, and a passageway 142 defined axially through the tube 122. In an alternate embodiment, one or more sealing structures may be positioned between the portions 130 and 132 of the tube 124 and the inner diameter 114 of the bore 113 of the shaft 110 so that fluid may not pass between the channels 138, 140, and/or 142. In this embodiment, the tube member 120 and the shaft 110 thus cooperate to axially define 5 separate fluid channels or passageways therethrough, the four channels 134, 136, 138 and 140, and the passageway 142 (with fluid able to flow between/among the passages 138, 140, and/or 142, in the illustrated embodiment). Although the channels 134 and 136 are illustrated in FIG. 2 as being asymmetrically positioned about the outer surface of the tube 122, it will be understood that the channels 134 and 136 may alternatively be positioned symmetrically about the outer surface of the tube 122. It will be further understood that while the tube member 122 illustrated in FIG. 2 defines two channels 134 and 136 between the tubes 124 and 122, this disclosure contemplates that more or fewer such channels may be alternatively formed between the tubes 122 and 124.
Referring again to FIG. 1, the inner tube 122 defines an opening 148 into the channel 134, and the outer tube 124 also defines an opening 150 into the channel 134 that is aligned with the bore 118A formed through the shaft 110. Fluid may thus pass axially along the tube member 120 through the channel 134 between the openings 148 and 150.
The apparatus 100 further includes a manifold 160 that defines a number of fluid passageways therethrough. In the illustrated embodiment, for example, a fluid passageway 162 extends into the manifold 160 and is fluidly coupled to another fluid passageway 165 that is fluidly coupled to the bore 113 of the shaft 110. Another fluid passageway 164 extends into the manifold 160 and is fluidly coupled to another fluid passageway 168 that extends at least partially radially about the manifold 160. Yet another fluid passageway 166 extends into the manifold 160 and is fluidly coupled to still another fluid passageway 170 that likewise extends at least partially radially about the manifold 160 separately from the fluid passageway 168. In the illustrated embodiment, the fluid passageway 170 is aligned with the opening 148 formed through the tube 122 and extending into the channel 134. In the illustrated embodiment, fluid may thus be routed from the fluid passageway 166 of the manifold 160 through the bore 118A of the shaft 110 via the fluid passageways 170, 148, 134, 150 and 118A as illustrated in FIG. 1.
In the illustrated embodiment, the manifold 160 is held stationary and the combination shaft 110 and tube member 120 rotate together about the manifold 160. The manifold 160 includes a number of conventional sealing members, e.g., sealing rings, 172 that are positioned as illustrated in FIG. 1 to keep fluids from axially leaking from the fluid passageways 168 and 170 along the inner surface of the tube 122. In general, the relative positions of the shaft 110 and the tube member 120 are configured to maintain alignment of the fluid passageways (e.g. 118A, 150). It will be understood, however, that this disclosure contemplates embodiments in which the combination shaft 110 and tube member 120 are held stationary and the manifold 160 rotates relative thereto, in which the manifold 160 and tube member 120 are stationary and the shaft 110 rotates about the combination, in which the shaft 110 is stationary and the combination manifold 160 and tube member 120 rotate about the shaft 110, or in which the combination shaft 110 and tube member 120 and the manifold 160 are all stationary, as long as the requirements of the particular design are met.
In one specific embodiment of the apparatus 100 illustrated in FIG. 1, at least one of the channels 134 and 136 is illustratively used to route pressurized fluid to one or more torque transmitting mechanisms or friction devices mounted to or fluidly coupled to the shaft 110, and the channels 138 and 140 and the fluid passageway 142, as well as perhaps one of the channels 134 and 136, are illustratively used to route lubricating fluid to one or more torque transmitting mechanisms or friction devices, and/or to the tube member 120 and shaft 110 combination and/or to one or more other components.
Referring now to FIG. 4, a cross-sectional diagram is shown of a portion of an automatic transmission showing another illustrative embodiment of an apparatus 200 for axially transferring fluids along an elongated path to a plurality of transmission components. In FIG. 5, a cross-sectional view of the tube member 220 is shown. Many of the components in the apparatus 200 are identical to those illustrated and described hereinabove with respect to the apparatus 100, and like numbers (plus 100) are used in FIG. 4 to identify like components. In the embodiment illustrated in FIGS. 4 and 5, the tube member 220 differs from the tube member 120 in that the tube member 220 defines an additional fluid channel or passageway between the tubes 222 and 224, for a total of three such fluid channels or passageways 234, 236 and 238, and an additional fluid channel or passageway between the outer tube 224 and the inner diameter 214 of the bore 213 of the shaft 210 for a total of three such fluid channels or passageways 240A, 240B and 240C. The inner diameter of the tube 222 defines an additional fluid channel or passageway 242. In the illustrated embodiment, the inner tube 222 additionally defines an air bleed hole 245 therethrough.
In the embodiment illustrated in FIG. 4, a fluid source 280 is mounted to the manifold 260. Fluid entering a fluid port 282 may enter the fluid passageway 264 of the manifold 260, fluid entering a fluid port 284 may enter the fluid passageway 262, and fluid entering a fluid port 283 may enter the fluid passageway 266. In the illustrated embodiment, two friction devices 290 and 310 are mounted to the outer surface of the shaft 210, and the shaft 210 defines a number of bores therethrough between the outer and inner surface thereof for fluid coupling of the devices 290 and 310 to the bore 213 of the shaft 210. For example, the friction device 290 includes a friction apparatus 292, e.g., a clutch pack, which is fluidly coupled to a bore 300 via a fluid chamber 298. The fluid chamber 298 is fluidly coupled to the bore 213 of the shaft 210 via a passageway, 302 or 322. The friction device 290 further includes a friction device piston chamber 295 which is fluidly coupled to the fluid port 284 via the passageways 297, 256, 236, 249, 270, and 262. The fluid passageway 238 connects the fluid from the fluid port 283 to the fluid chamber 298 after filling the fluid chambers 294 and 314. To fill the fluid chambers 294 and 314, the fluid from the fluid port 283 flows through the fluid passageways 266, 265, 213, 302 and 322, to the chambers 294 and 314. Overflow from the chambers 294, 314 exits through the passageways 296, 254, and 320, 258, respectively, into the passageway 238. The fluid then exits from the passageway 238 through the passageways 252, 300 and flows into the fluid chamber 298. While shown in phantom in FIG. 4, it will be appreciated that the openings 252, 254, 256, and 258 are holes defined in the outer tube 224 that are aligned with the passageways 300, 296, 297, 320, respectively, and radially spaced from the opening 250; and that the opening 249 is a hole defined in the inner tube 222 and radially spaced from the opening 248.
The friction device 290 further includes a balance cavity 294 which is fluidly coupled to a bore 302 that fluidly couples the cavity 294 to the bore 213 of the shaft 210. The friction device 310 likewise includes a friction apparatus 312, e.g., a clutch pack, and a friction device piston chamber 315. The chamber 315 is connected to the fluid port 282 via the fluid passageways 316, 250, 234, 248, 268, and 264. The friction device 310 further includes a balance cavity 314, which is fluidly coupled to a bore 320 that fluidly couples the cavity 314 to the bore 213 of the shaft 210 via a balance cavity feed bore 322.
In the embodiment illustrated in FIG. 4, the opening 248 defined by the tube 222 to the fluid channel 234 is aligned with the fluid passageway 268 and the opening 250 defined by the tube 224 into the fluid channel 234 is aligned with the bore 316 so that fluid entering the port 282 and the fluid passageway 264 is routed axially along the tube member 222 to the clutch piston chamber 315 via the fluid passageway 268, the fluid channel 234 and the bore 316. The fluid channel 234 is thus used to transmit fluid, e.g., oil, from the stationary manifold 260 to the friction device piston of the friction device 310 for actuation control of the friction device 310. Another of the fluid channels 236 or 238 is used in like manner to transmit fluid, e.g., oil, from the stationary manifold 260 to the friction device piston of the friction device 290 for actuation control thereof. The third fluid channel 236 or 238 illustratively serves as a fluid overflow cavity that reduces the inner diameter of each annulus of rotating fluid, e.g., oil, to centrifugally balance the friction device apply pistons. For example, in the illustrated embodiment, the balance cavities of the friction devices, e.g., 290 and 310, are fed from pressurized lubrication oil in the passages, e.g., the fluid channel 240C, between the tube member 224 and the inner surface 214 of the bore 213 of the shaft 210 (e.g., which is supplied via the fluid passageway 262 and through the fluid passageway or channel 242 of the tube member 220). Once the balance cavities 294 and 314 are filled, the fluid, e.g., oil, then flows through bores 296, 320 formed through the shaft 210 and into the third fluid channel 236 or 238. The fluid, e.g., oil, then exits the third fluid channel 236 or 238 through bore 300 into the chamber 298 to cool the corresponding friction apparatus 292. This reduced diameter of the annulus of rotating balance fluid, e.g., oil, creates a higher pressure head opposing the pressure head created on the apply side of the friction device piston which allows the shaft 210 to rotate at a higher speed before the friction device apply piston begins to stroke. A higher shaft speed allows lower torque to be transmitted through the shaft 210 which reduces gear and shaft loads as well as a corresponding size of such components.
Referring now to FIGS. 6-10, cross-sectional diagrams are shown of yet another alternative embodiment of an apparatus 400 for axially transferring fluids along an elongated path to a plurality of components. The apparatus 400 may be configured for use in any of the embodiments illustrated in FIGS. 1-5 and 11, or may alternatively be configured for use in one or more other applications. In the illustrated embodiment, as shown in FIG. 6, the apparatus 400 includes a shaft 410 having opposite ends 412 and 413, and defining a bore 414 therethrough. An elongated tube member 420 is configured to be axially received within the bore 414 of the shaft 410 such that one end of the tube member 420 is positioned adjacent to the end 412 of the shaft 410.
As illustrated in FIGS. 6-8, the portion of the bore 414 that receives the tube member 420 defines a number of axial channels therein. Referring to FIG. 8, for example, the inner surface 414 of the shaft 410 defines four channels 418A-418D therein that are symmetrically spaced from each other about the circumference of the bore 414. It will be appreciated, however, that more or fewer such channels, symmetrically spaced or otherwise, may alternatively be formed in the inner surface 414 of the shaft 410.
The tube member 420 is, as illustrated in FIG. 9, a single, hollow tube defining a bore 422 therethrough. In the illustrated embodiment, the tube member 420 is circular in cross-section and has constant diameter inner and outer surfaces. The apparatus 400 is assembled by inserting the tube member 420 into the bore 414 at the end 412 of the shaft 410. The tube member 420 and the shaft 410 are configured such that the outer surface of the tube member 420 forms an interference fit with the bore 414 defined through the shaft 410, and the terminal ends of the tube member 420 form seals with the bore 414. The outer surface of the tube member 420 and the surface of the bore 414 form separate fluid transfer cavities or channels, e.g., 418A-418D, through which fluid can be axially transferred.
Referring now to FIG. 11, a cross-sectional diagram is shown of a portion of an automatic transmission showing another illustrative embodiment of an apparatus 500 for axially transferring fluids along an elongated path to a plurality of transmission components. Many of the components in the apparatus 500 are similar or identical in structure and/or function to those illustrated and described hereinabove with respect to the apparatus 100 and the apparatus 200, and like numbers (beginning with 500) are used in FIG. 11 to identify like components. In the embodiment illustrated of FIG. 11, fluid may be routed from the fluid passageways 562, 564 of the manifold 560 through the bores 518A, 518B of the shaft 510 via the fluid passageways 570A, 570B, 548A, 548B, 534, 540, 550A and 550B. In the embodiment of FIG. 11, the tube member 520 has an outer diameter 574 and an inner diameter 576, where the outer diameter is larger than the inner diameter 576. Fluid may enter the tube member 520 via openings 570A, 570B, which are adjacent the outer diameter 574 of the tube 524. In other words, whereas in the above-described embodiments fluid is supplied from an interior entry point (e.g. opening 148 of FIG. 1), in the embodiment of FIG. 11, fluid enters the tube member 520 from an exterior entry point (e.g. 548A, 548B).
In the illustrated embodiment, the elongated path takes the form of a shaft 510 defining a bore 513 therethrough. Between one end 512 of the shaft 510 and a wall portion 515 of the bore 513, the bore 513 defines one diameter 514, and between the wall portion 515 and an opposite end (not shown) of the shaft 510, the bore 513 defines another diameter 516, wherein the diameter 514 is generally larger than the diameter 516. Illustratively, the diameter 514 is sized to accommodate axial insertion of the tube member 520 therein. Along the shaft 510, a number of bores extend through an exterior surface thereof to the bore 513. In the illustrated embodiment, two such bores 518A and 518B are identified. In one embodiment, the shaft 510 forms one component of a transmission for a mobile vehicle, and the bores 518A and 5188 each lead to a fluid input of a fluid-controlled torque transmitting mechanism or friction device, e.g., a clutch, brake, or other torque transmitting device, although this disclosure contemplates embodiments in which the apparatus 500 is configured to axially transfer fluid to other components. In any case, the shaft 510 is illustratively formed of a conventional metal, combination of metals or a metal composite, although this disclosure contemplates other embodiments in which the shaft 510 is formed of other materials and/or material combinations.
The tube member 520 is an elongated tubular structure that is axially received within the bore 513, e.g., between the end 512 of the shaft 510 and the wall portion 515 as illustrated in FIG. 11. In the illustrated embodiment, the tube member 520 is formed of a conventional hollow, metal tube or bar stock with an inner surface of one tube 524 selectively joined to an outer surface of another tube 522. Generally, the inner surface of the tube 524 has a diameter that is larger than the diameter of the outer surface of the tube 522.
While not specifically shown in FIG. 11, one portion of the inner surface of the tube 524 is longitudinally joined to and along a corresponding portion of the outer surface of the tube 522, and another portion of the inner surface of the tube 524 is longitudinally joined to and along a corresponding portion of the outer surface of the tube 522, in a similar manner as shown in FIG. 2. The remaining portions of the tube 524 and the corresponding portions of the outer surface of the tube 522 define separate, i.e., not fluidly connected, longitudinal or axial channels or passageways respectively therebetween that extend longitudinally or axially along the tube member 520, in a similar manner as shown in FIG. 2. It will be understood that the sectional view of FIG. 11 is taken at a different location along the tube member 520 than the corresponding view of the embodiment of FIG. 1. For example, the sectional view of FIG. 11 is similar to a view across the channels or passageways 134, 136 of FIG. 2. Also, it will be understood that any number of longitudinal or axial channels or passageways may be defined longitudinally or axially along or through the tube member 520, as shown in FIGS. 2, 5, 6-10 or otherwise as may be needed for a given design.
As illustrated in FIG. 11, the ends of the tubes 522 and 524 are circumferentially joined at 544 and 546. In the illustrated embodiment, the ends of the tube 522 and 524 are joined by deforming (e.g. bending or pressing) the opposite ends of the tube 524 toward the corresponding ends of the tube 522 and then joining the ends of the tubes 522 and 524 using one or more conventional joining techniques. In other embodiments, the ends of the tubes 522 and 524 of the tube member 520 adjacent to the end 512 of the shaft 510 may be joined at 546 by deforming the end of the tube 522 toward the end of the tube 524 and joining the ends of the tubes 522 and 524, in a similar manner as shown in FIG. 3, using one or more conventional joining techniques. Examples of suitable joining techniques include, but are not limited to, welding, spot welding, laser welding, using one or more adhesives and/or conventional fastening members, or the like.
The manifold 560 defines a number of fluid passageways therethrough. In the illustrated embodiment, for example, the fluid passageway 562 extends into the manifold 560 and is fluidly coupled to the fluid passageway 570A, which extends at least partially radially about the manifold 560 and is fluidly coupled to the passageway 534. The fluid passageway 564 extends into the manifold 560 and is fluidly coupled to the fluid passageway 570B, which likewise extends at least partially radially about the manifold 560 separately from the fluid passageway 570A. In the illustrated embodiment, the fluid passageway 570A is aligned with the opening 548A formed through the tube 524 and extending into the channel 534. Similarly, the fluid passageway 570B is aligned with the opening 548B formed through the tube 524 and extending into the channel 540.
A fluid passageway 566 extends into the manifold 560 and is fluidly coupled to the fluid passageway 570A. In the illustrated embodiment, the passageway 566 provides lubricating fluid through the manifold 560.
In the illustrated embodiment, the manifold 560 is held stationary and the combination shaft 510 and tube member 520 rotate together relative to the manifold 560. In general, the relative positions of the shaft 510 and the tube member 520 are configured to maintain alignment of the fluid passageways (e.g. 548A, 570A, 548B, 570B). It will be understood, however, that this disclosure contemplates embodiments in which the combination shaft 510 and tube member 520 are held stationary and the manifold 560 rotates relative thereto, in which the manifold 560 and tube member 520 are stationary and the shaft 510 rotates about the combination, in which the shaft 510 is stationary and the combination manifold 560 and tube member 520 rotate about the shaft 510, or in which the combination shaft 510 and tube member 520 and the manifold 560 are all stationary, as long as the requirements of the particular design are met.
Also, as can be seen from FIG. 11, in the illustrated embodiment 500, at least a portion of the combination shaft 510 and tube member 520 is inserted into the manifold 560, in contrast to the above described embodiments, wherein at least a portion of the manifold (e.g. 160, 260) is inserted into one end of the combination shaft and tube member (e.g. 110, 120; 210, 220). Whereas the fluid passageways (e.g. 162, 164; 262, 264) are positioned within the bore (e.g. 113, 213), the fluid passageways 562, 564 are positioned outside of the bore 513.
In one specific embodiment of the apparatus 500, at least one of the channels 534 and 540 is illustratively used to route pressurized fluid to one or more torque transmitting mechanisms or friction devices mounted to or fluidly coupled to the shaft 510, and others of the axial or longitudinal channels defined along the tube member 520, or perhaps one of the channels 534 and 540, may be used to route lubricating fluid to one or more torque transmitting mechanisms or friction devices, and/or to the tube member 520 and shaft 510 combination and/or to one or more other components.
While the invention has been illustrated and described in detail in the foregoing drawings and description, the same is to be considered as illustrative and not restrictive in character, it being understood that only illustrative embodiments thereof have been shown and described and that all changes and modifications that come within the spirit of the invention are desired to be protected. For example, while the various embodiments of the shaft 110, 210, 410, 510 and the tube member 120, 220, 420, 520 are illustrated as being generally circular in cross-section, this disclosure contemplates that any of the embodiments of the shaft and the tube member may alternatively have cross-sections other than circular. Moreover, it will be understood that the fluid channels or passageways defined between the inner and outer tubes in the embodiments illustrated and described with respect to FIGS. 1-5 and 11 may be symmetrically or non-symmetrically positioned about the tube members, and that the channels formed in the shaft of the embodiment illustrated and described with respect to FIGS. 6-10 may be symmetrically or non-symmetrically positioned about the inner surface of the shaft.

## Claims

1. An apparatus for axially transferring fluid, comprising:
an elongated shaft defining a first fluid passageway axially therethrough,
a second fluid passageway extending through the elongated shaft from an outer surface of the elongated shaft into the first fluid passageway,
an elongated member defining a third fluid passageway axially therethrough, the elongated member received within the first fluid passageway of the elongated shaft,
a fourth fluid passageway extending through the elongated shaft from an outer surface of the elongated shaft into the first fluid passageway, the fourth fluid passageway being axially spaced from the second fluid passageway, the fourth fluid passageway being configured to receive fluid from a source of fluid, and
a plurality of channels defined by and extending axially along one of the elongated tube member separate from the third fluid passageway and the first fluid passageway between an inner surface of the first fluid passageway and an outer surface of the elongated tube member, one of the plurality of channels defining a first opening near one end thereof that aligns with the fourth passageway and a second opening axially spaced from the first opening and that aligns with the second fluid passageway such that fluid can be axially transferred by the one of the plurality of channels from the first opening through the second fluid passageway defined through the elongated shaft.

2. The apparatus of claim 1, further comprising a manifold defining a fifth fluid passageway having one end configured to be fluidly coupled to the source of fluid and an opposite end fluidly coupled to the fourth fluid passageway such that fluid from the source of fluid can flow through the fifth fluid passageway to the at least one of the plurality of channels.

3. The apparatus of claim 2, wherein at least a portion of the elongated tube member is received within the manifold.

4. The apparatus of claim 2, wherein at least one of the elongated shaft and the elongated tube member are rotatable relative to the manifold.

5. The apparatus of claim 2, wherein the manifold is stationary.

6. An apparatus for axially transferring fluid, comprising:
an elongated shaft defining a first fluid passageway axially therethrough,
a second fluid passageway extending through the elongated shaft from an outer surface of the elongated shaft into the first fluid passageway,
an elongated member defining a third fluid passageway axially therethrough, the elongated member received within the first fluid passageway of the elongated shaft,
a fourth fluid passageway extending through the elongated shaft from an outer surface of the elongated shaft into the first fluid passageway, the fourth fluid passageway being axially spaced from the second fluid passageway, the fourth fluid passageway being configured to receive fluid from a source of fluid, and
a plurality of channels defined by and extending axially along one of the elongated tube member separate from the third fluid passageway and the first fluid passageway between an inner surface of the first fluid passageway and an outer surface of the elongated tube member, one of the plurality of channels defining a first opening near one end thereof that aligns with the fourth passageway and a second opening axially spaced from the first opening and that aligns with the second fluid passageway such that fluid can be axially transferred by the one of the plurality of channels from the first opening through the second fluid passageway defined through the elongated shaft,
wherein the second fluid passageway is fluidly coupled to a component of an automatic transmission.

7. The apparatus of claim 6, further comprising a manifold defining a fifth fluid passageway having one end configured to be fluidly coupled to the source of fluid and an opposite end fluidly coupled to the fourth fluid passageway such that fluid from the source of fluid can flow through the fifth fluid passageway to the at least one of the plurality of channels.

8. The apparatus of claim 7, wherein at least a portion of the elongated tube member is received within the manifold.

9. The apparatus of claim 7, wherein at least one of the elongated shaft and the elongated tube member are rotatable relative to the manifold.

10. The apparatus of claim 7, wherein the manifold is stationary.

11. The apparatus of claim 6, wherein the elongated shaft defines a fifth fluid passageway separate from the second fluid passageway and extending through the elongated shaft from an outer surface of the elongated shaft into the first fluid passageway,
and wherein another one of the plurality of channels defines a first opening near one end thereof that receives fluid from the source of fluid and a second opening axially spaced apart from the first opening of the another one of the plurality of channels that aligns with the fifth fluid passageway such that fluid can be axially transferred by the another one of the plurality of channels from the first opening of the another one of the plurality of channels to the torque transmitting mechanism through the fifth fluid passageway defined through the elongated shaft.

12. An apparatus for axially transferring fluid to a plurality of components of a transmission, comprising:
a shaft defining a first bore axially therethrough,
a tube defining a first fluid passageway axially therethrough, the tube received within the first bore of the shaft,
a second bore extending through the shaft from an exterior surface thereof into the first bore, the second bore being configured to receive fluid from a fluid source,
a manifold defining a second fluid passageway and a third fluid passageway, the second fluid passageway having one end configured to be fluidly coupled to the fluid source and an opposite end fluidly coupled to the third fluid passageway, and
a plurality of channels defined by and extending axially along the tube separate from the first bore and the first fluid passageway between an inner surface of the first bore and an outer surface of the tube, one of the plurality of channels defining a first opening near end thereof that aligns with the third fluid passageway and a second opening axially spaced from the first opening that aligns with the second bore such that fluid from the fluid source can be axially transferred by the one of the plurality of channels from the first opening through the second bore and to at least one fluidly-controlled friction device of the transmission.

13. The apparatus of claim 12, wherein the at least one fluidly-controlled friction device is a friction clutch, and wherein the friction clutch is coupled to the exterior surface of the shaft.

14. The apparatus of claim 13, wherein the friction clutch comprises a clutch pack and a piston chamber fluidly coupled to the second bore, and wherein the fluid source is coupled to the manifold and comprises a fluid port.

15. The apparatus of claim 14, wherein fluid from the fluid source is transferred from the fluid port to the piston chamber via the second fluid passageway, the third fluid passageway, the first opening, the one of the plurality of channels, the second opening, and the second bore.

16. The apparatus of claim of claim 12, wherein at least a portion of the tube is received within the manifold.

17. The apparatus of claim 16, wherein at least one of the shaft and the tube are rotatable relative to the manifold.

18. The apparatus of claim 17, wherein the manifold is stationary.

19. The apparatus of claim 2, wherein (i) the elongated shaft defines a sixth fluid passageway separate from the second fluid passageway and extending through the elongated shaft from an outer surface of the elongated shaft into the first fluid passageway, and (ii) another one of the plurality of channels defines a first opening near one end thereof that receives fluid from the source of fluid and a second opening axially spaced apart from the first opening of the another one of the plurality of channels that aligns with the sixth fluid passageway such that fluid can be axially transferred by the another one of the plurality of channels from the first opening of the another one of the plurality of channels to one or more components of an automatic transmission through the sixth fluid passageway defined through the elongated shaft.