IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0539299
(2006-10-06)
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등록번호 |
US-7431124
(2008-10-07)
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발명자
/ 주소 |
|
출원인 / 주소 |
- White Drive Products, Inc.
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
6 인용 특허 :
18 |
초록
▼
The present disclosure relates to a hydraulic transmission assembly for a ground vehicle comprises a pump unit and a hydraulic motor assembly connected to the pump unit. The pump unit includes a driven shaft configured to operably connect to a motor of the ground vehicle. The hydraulic motor assembl
The present disclosure relates to a hydraulic transmission assembly for a ground vehicle comprises a pump unit and a hydraulic motor assembly connected to the pump unit. The pump unit includes a driven shaft configured to operably connect to a motor of the ground vehicle. The hydraulic motor assembly includes a motor housing configured to rotatably mount to a wheel assembly of the ground vehicle. The housing has a central opening. A stationary output shaft has a first end section received in the central opening and a second end section configured to rigidly attach to a frame of the ground vehicle. The output shaft includes at least one internal fluid passage in fluid communication with at least one fluid passage of the pump unit. Pressurization of the hydraulic motor assembly via the pump unit rotates the motor housing relative to the stationary output shaft which, in turn, rotates the wheel assembly in one of a first direction and second direction.
대표청구항
▼
Having thus described the invention, it is now claimed: 1. A hydraulic transmission assembly for an associated ground vehicle comprising: a pump unit including a driven shaft configured to operably connect to an associated motor of the associated ground vehicle; a hydraulic motor assembly connected
Having thus described the invention, it is now claimed: 1. A hydraulic transmission assembly for an associated ground vehicle comprising: a pump unit including a driven shaft configured to operably connect to an associated motor of the associated ground vehicle; a hydraulic motor assembly connected to said pump unit, said motor assembly including: a motor housing configured to mount to an associated wheel assembly of the associated ground vehicle for rotation with the associated wheel assembly, said housing having a central opening, a stationary elongated output shaft having a first end section received in said central opening and a second end section configured to rigidly attach to an associated frame of the associated ground vehicle, said output shaft including at least one internal fluid passage in fluid communication with at least one fluid passage of said pump unit, and a stationary manifold attached to the associated frame and fluidly connecting said pump unit and said hydraulic motor assembly with no intervening external fluid lines, wherein pressurization of said hydraulic motor assembly via said pump unit rotates said motor housing relative to said stationary output shaft which, in turn, rotates the associated wheel assembly in one of a first direction and second direction. 2. The hydraulic transmission assembly of claim 1, wherein said output shaft is generally cylindrical and includes a first defined fluid passage and a second defined fluid passage, each of said first and second defined fluid passage being in fluid communication with said at least one fluid passage of said pump unit, wherein pressurization of said first defined fluid passage rotates said motor housing in said first direction, wherein pressurization of said second defined fluid passage rotates said motor housing in said second direction. 3. The hydraulic transmission assembly of claim 2, wherein said output shaft includes a third defined fluid passage in selective fluid communication with one of said first and second defined fluid passages, said third defined fluid passage communicating with a pressurizable brake assembly at least partially housed in said motor housing of said hydraulic motor assembly. 4. The hydraulic transmission assembly of claim 3, further including a first valve member, said first valve member allowing selective communication between either of said first defined fluid passage or said second defined fluid passage, when either of said first or second passages are pressurized, and said third defined fluid passage. 5. The hydraulic transmission assembly of claim 3, further including a second valve member, said second valve member operably coupled to said third defined fluid passage, said second valve member configured to direct pressurized fluid out of said hydraulic transmission assembly in response to a pressure surge. 6. The hydraulic transmission assembly of claim 2, further comprising a gerotor assembly including a drive link connecting said stationary output shaft to said gerotor assembly, a fluid inlet and a fluid outlet in fluid communication with said first and second defined fluid passages. 7. The hydraulic transmission assembly of claim 1, further comprising a gerotor assembly fixedly mounted to said motor housing, said gerotor assembly including a drive link at least partially surrounded by said motor housing and at least one fluid passage in communication with said at least one internal fluid passage of said output shaft. 8. The hydraulic transmission assembly of claim 1, wherein the manifold is disposed between said pump unit and said output shaft and is fluidly connected to said at least one passage of said pump unit and said at least one passage of said output shaft via at least one internal passage. 9. A hydraulic transmission assembly comprising: a rotatable housing; a fixed output shaft at least partially disposed in said housing, said output shaft at least partially extending axially from said housing, said output shaft including first and second independently pressurizable fluid passages; a gerotor assembly cooperating with said output shaft, said gerotor assembly being in communication with said first and second fluid passages; and a pressure released brake assembly cooperating with said output shaft and said housing, wherein said housing defines a pressurizable brake chamber for housing said pressure released brake assembly, wherein pressurization of said first fluid passage rotates said housing in a first direction, wherein pressurization of said second fluid passage rotates said housing in a second direction, and wherein pressurization of either of said first fluid passage or said second fluid passage results in said pressure released brake assembly operating in a disengaged position which allows for rotation of said housing relative to said fixed output shaft in one of said first and second directions, wherein output shaft further includes a third fluid passage in communication with said brake chamber, wherein pressurization of either of said first fluid passage or said second fluid passage results in pressurization of said third fluid passage, wherein said output shaft further includes a first valve member, said first valve member allowing selective communication between either of said first fluid passage or said second fluid passage, when either of said first or second passages are pressurized, and said third fluid passage. 10. The hydraulic transmission assembly of claim 9, wherein said housing includes a first housing section mounted to a second housing section, said first and second housing sections defining said pressurizable brake chamber. 11. The hydraulic transmission assembly of claim 10, wherein said first and second and third fluid passages are generally parallel. 12. The hydraulic transmission assembly of claim 11, wherein said output shaft further includes a relief valve member in communication with said third fluid passage for relieving a pressure build-up in said hydraulic transmission assembly. 13. The hydraulic transmission assembly of claim 12, wherein said relief valve member includes a fluid leakage hole, said leakage hole allowing fluid to flow from said third fluid passage to at least one of a tank dump and a heat exchanger. 14. The hydraulic transmission assembly of claim 10, wherein said pressure released brake assembly includes a friction disk and a disk stamping, the friction disk being connected to said output shaft and the disk stamping being connected to said motor housing. 15. The hydraulic transmission assembly of claim 9, further comprising a variable displacement pump unit for delivering pressurized fluid to one of said first and second fluid passages. 16. The hydraulic transmission assembly of claim 15, further comprising a separate fixed manifold fluidly connected to said pump unit and said output shaft with no intervening external fluid lines. 17. The hydraulic transmission assembly of claim 9, further comprising means for disengaging said brake assembly during a static condition of said hydraulic transmission assembly. 18. A hydraulic transmission assembly comprising: a gerotor assembly including a rotor and a stator; a drive link connected at a first end to the rotor; a stationary shaft connected to a second end of the drive link; a housing assembly receiving the gerotor assembly, the drive link and the stationary shaft; a first passage in the stationary shaft and in communication with the gerotor assembly; a second passage in the stationary shaft and in communication with the gerotor assembly; a first brake disk connected to the stationary shaft; a second brake disk connected to the housing assembly; a piston disposed in the housing assembly adjacent at least one of the brake disks, the piston cooperating with the housing assembly to define a brake pressure chamber, the housing assembly and the first and second passages being configured such that pressurization of either passage results in pressurization of the brake pressure chamber; and a biasing member disposed in the housing and contacting the piston, the biasing member urging the piston toward at least one of the brake disks. 19. The hydraulic transmission assembly of claim 18, wherein the first and second passages are offset, wherein pressurization of said first passage rotates said housing assembly in a first direction, wherein pressurization of said second passage rotates said housing assembly in a second direction. 20. The hydraulic transmission assembly of claim 19, wherein said stationary shaft includes a third separate pressurizable passage in fluid communication with said brake pressure chamber, said third passage being axially aligned with said first and second passages. 21. The hydraulic transmission assembly of claim 20, wherein said third passage is in selective communication with one of said first and second passages via a valve member. 22. The hydraulic transmission assembly of claim 20, further including a second valve member at least partially located in said third passage for relieving a pressure build-up in said hydraulic transmission assembly. 23. The hydraulic motor assembly of claim 20, further including a friction disk and a disk stamping located within said brake chamber, the friction disk being connected to said output shaft and the disk stamping being connected to said motor housing. 24. The hydraulic transmission assembly of claim 19, wherein said gerotor assembly including a fluid inlet and a fluid outlet both in fluid communication with said first and second passages. 25. The hydraulic transmission assembly of claim 18, in connection with a wheel drum, said housing assembly being directly connected to said wheel drum for rotation therewith. 26. The hydraulic transmission assembly of claim 18, in connection with a wheel drum, said motor housing including bolt holes for attaching said motor housing to said wheel drum for rotation therewith.
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