IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
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출원번호 |
UP-0676529
(2007-02-20)
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등록번호 |
US-7536858
(2009-07-01)
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발명자
/ 주소 |
- Abend, Robert
- Ishii, Norihiro
- Ohashi, Ryota
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출원인 / 주소 |
- Kanzaki Kokyukoki Mfg. Co., Ltd.
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대리인 / 주소 |
Sterne, Kessler, Goldstein & Fox P.L.L.C.
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인용정보 |
피인용 횟수 :
5 인용 특허 :
61 |
초록
▼
An axle driving apparatus for being mounted on the body frame of a vehicle and for independently rotating drive wheel members. The axle driving apparatus includes a first axle driving unit (18L) having a housing (40) and a single axle (20L), the single axle (20L) defining a proximal end portion rota
An axle driving apparatus for being mounted on the body frame of a vehicle and for independently rotating drive wheel members. The axle driving apparatus includes a first axle driving unit (18L) having a housing (40) and a single axle (20L), the single axle (20L) defining a proximal end portion rotatably mounted in the housing (40) and a distal end portion extending outwardly from a first side of the housing (40). An enlarged region is defined by the housing (40), with the enlarged region extending substantially perpendicular to the longitudinal axis of the single axle (20L). A hydraulic stepless speed change assembly (22) is disposed within the enlarged region. The speed change assembly (22) includes a hydraulic pump (52) having an input shaft (21) projecting from the enlarged region and includes a hydraulic motor (55) including an output shaft (74) drivingly connected to the single axle (20L). The first axle driving unit (18L) is used in conjunction with a second axle driving unit (18R) which is adjacently disposed to the first axle driving unit (18L) on the body frame of the vehicle and which is of substantially similar construction. However, the second axle driving unit (18R) features a single axle (20R) which extends outwardly from a second, opposite side of the housing (40) such that the axles (20L, 20R) are oppositely disposed.
대표청구항
▼
We claim: 1. An integrated hydrostatic transaxle for independently driving a right or left wheel of a vehicle, comprising: a housing for supporting a single axle; and a hydrostatic transmission including a hydraulic pump, a hydraulic motor, and a center section separately mounted within the housing
We claim: 1. An integrated hydrostatic transaxle for independently driving a right or left wheel of a vehicle, comprising: a housing for supporting a single axle; and a hydrostatic transmission including a hydraulic pump, a hydraulic motor, and a center section separately mounted within the housing; wherein the pump includes a pump shaft and a rotatable cylinder block mounted on a pump mounting surface of the center section; wherein the motor includes a motor shaft and a rotatable cylinder block mounted on a motor mounting surface of the center section; wherein the pump mounting surface and the motor mounting surface are perpendicular to each other; wherein a plane located along the motor mounting surface intersects the pump mounting surface; and wherein the plane intersects the pump shaft. 2. An integrated hydrostatic transaxle as set forth in claim 1, wherein the plane intersects a rotational axis of the pump shaft. 3. An integrated hydrostatic transaxle as set forth in claim 1, wherein the center section is formed of one integral piece. 4. An integrated hydrostatic transaxle as set forth in claim 3, wherein the pump mounting surface further comprises; a bore supporting a portion of the pump shaft. 5. An integrated hydrostatic transaxle as set forth in claim 4, wherein the bore transects through the center section, from the pump mounting surface to an opposite side of the center section, and the pump shaft extends through the bore, to thereby fully transect the center section. 6. An integrated hydrostatic transaxle as set forth in claim 1, wherein the pump mounting surface and the motor mounting surface are positioned such that the hydraulic pump is mounted a greater distance from the axle than a distance between the hydraulic motor and the axle. 7. An integrated hydrostatic transaxle as set forth in claim 1, wherein a rotational axis of the motor shaft is disposed relatively lower than the pump mounting surface. 8. An integrated hydrostatic transaxle as set forth in claim 1, wherein the center section further comprises: a pair of ports at the pump mounting surface; a pair of ports at the motor mounting surface; oil passages connecting the ports on the pump mounting surface to the ports on the motor mounting surface; and an operating oil supply means for replenishing oil that has leaked. 9. An integrated hydrostatic transaxle as set forth in claim 8, wherein the operating oil supply means includes an oil filter disposed on an opposite side of the center section relative to the pump mounting surface. 10. An integrated hydrostatic transaxle as set forth in claim 8, wherein the oil passages extend parallel to the plane along the motor mounting surface. 11. An integrated hydrostatic transaxle as set forth in claim 1, further comprising: a bore transecting through the center section, from the motor mounting surface to an opposite side of the center section; wherein an end of the motor shaft extends through the bore, outwardly from the opposite side of the center section, and drivingly connects to the axle. 12. An integrated hydrostatic transaxle as set forth in claim 11, wherein a portion of the motor shaft is supported by the housing. 13. An integrated hydrostatic transaxle as set forth in claim 1, wherein the housing includes two housing parts detachably joined together along a parting plane, and the center section is fixed to one of the housing parts through a bolt, wherein a longitudinal direction of the bolt is perpendicular to the parting plane. 14. An integrated hydrostatic transaxle as set forth in claim 1, wherein the housing includes two housing parts detachably joined together along a parting plane, an inner surface of a wall of at least one of the housing parts includes a recess formed therein, and the center section includes an outwardly extending portion, extending parallel to the pump mounting surface, wherein the portion is fitted into the recess of the housing part. 15. An integrated hydrostatic transaxle for independently driving a right or left wheel of a vehicle, comprising: a housing for supporting a single axle; and a hydrostatic transmission including a hydraulic pump, a hydraulic motor, and a center section separately mounted within the housing; wherein the pump includes a pump shaft and a rotatable cylinder block mounted on a pump mounting surface of the center section; wherein the motor includes a motor shaft and a rotatable cylinder block mounted on a motor mounting surface of the center section; wherein the pump mounting surface and the motor mounting surface are perpendicular to each other; wherein a plane located along the motor mounting surface intersects the pump mounting surface; and a rotational axis of the motor shaft is disposed relatively lower than the pump mounting surface; and a charge pump disposed on an opposite side of the center section relative to the pump mounting surface; wherein an end of the pump shaft extends relatively lower than the rotational axis of the motor shaft; wherein the charge pump is driven by the end of the pump shaft. 16. An integrated hydrostatic transaxle for independently driving a right or left wheel of a vehicle, comprising: a housing supporting a single axle; and a hydrostatic transmission including a hydraulic pump, a hydraulic motor, and a center section separately mounted within the housing; wherein the pump includes a pump shaft and a rotatable cylinder block mounted on a pump mounting surface of the center section; wherein the motor includes a motor shaft and a rotatable cylinder block mounted on a motor mounting surface of the center section; wherein the pump mounting surface and the motor mounting surface are perpendicular to each other; wherein the center section includes a first plane along a first side of the center section, and a second plane along a second side of the center section, wherein the first and second planes are parallel to each other and perpendicular to a rotational axis of the motor shaft, wherein the pump mounting surface is perpendicular to and in between the first and second planes, and wherein the motor mounting surface is parallel to and in between the first and second planes; and wherein a third plane along the motor mounting surface intersects the pump shaft. 17. An integrated hydrostatic transaxle as set forth in claim 16, wherein the third plane intersects a rotational axis of the pump shaft. 18. An integrated hydrostatic transaxle as set forth in claim 16, wherein the center section is formed of one integral piece. 19. An integrated hydrostatic transaxle as set forth in claim 16, wherein pump mounting surface further comprises; a bore supporting a portion of the pump shaft. 20. An integrated hydrostatic transaxle as set forth in claim 19, wherein the bore transects through the center section, from the pump mounting surface to an opposite side of the center section, and the pump shaft extends through the bore, to thereby fully transect the center section. 21. An integrated hydrostatic transaxle as set forth in claim 16, wherein the pump mounting surface and the motor mounting surface are positioned such that the hydraulic pump is mounted a greater distance from the axle than a distance between the hydraulic motor and the axle. 22. An integrated hydrostatic transaxle as set forth in claim 16, wherein a rotational axis of the motor shaft is disposed relatively lower than the pump mounting surface. 23. An integrated hydrostatic transaxle as set forth in claim 16, wherein the center section further comprising: a pair of ports at the pump mounting surface, a pair of ports at the motor mounting surface, oil passages connecting the ports on the pump mounting surface to the ports on the motor mounting surface; and an operating oil supply means for replenishing oil that has leaked. 24. An integrated hydrostatic transaxle as set forth in claim 23, wherein the operating oil supply means includes an oil filter disposed on an opposite side of the center section relative to the pump mounting surface. 25. An integrated hydrostatic transaxle as set forth in claim 23, wherein the oil passages extend parallel to the plane along the motor mounting surface. 26. An integrated hydrostatic transaxle as set forth in claim 16, further comprising: a bore transecting through the center section, from the motor mounting surface to an opposite side of the center section; wherein an end of the motor shaft extends through the bore, extends outwardly from the opposite side of the center section, and drivingly connects to the axle. 27. An integrated hydrostatic transaxle as set forth in claim 16, wherein the housing includes two housing parts detachably joined together along a parting plane, the center section is fixed to one of the housing parts through a bolt, and wherein a longitudinal direction of the bolt is perpendicular to the parting plane. 28. An integrated hydrostatic transaxle as set forth in claim 16, wherein the housing includes two housing parts detachably joined together along a parting plane, an inner surface of a wall of at least one of the housing parts includes a recess formed therein, and the center section includes an outwardly extending portion, extending parallel to the pump mounting surface, wherein the portion is fitted into the recess of the housing part. 29. An integrated hydrostatic transaxle for independently driving a right or left wheel of a vehicle, comprising: a housing supporting a single axle; and a hydrostatic transmission including a hydraulic pump, a hydraulic motor, and a center section separately mounted within the housing; wherein the pump includes a pump shaft and a rotatable cylinder block mounted on a pump mounting surface of the center section; wherein the motor includes a motor shaft and a rotatable cylinder block mounted on a motor mounting surface of the center section; wherein the pump mounting surface and the motor mounting surface are perpendicular to each other; wherein the center section includes a first plane along a first side of the center section, and a second plane along a second side of the center section, wherein the first and second planes are parallel to each other and perpendicular to a rotational axis of the motor shaft, wherein the pump mounting surface is perpendicular to and in between the first and second planes, and wherein the motor mounting surface is parallel to and in between the first and second planes; a rotational axis of the motor shaft is disposed relatively lower than the pump mounting surface; and a charge pump disposed on an opposite side of the center section relative to the pump mounting surface; wherein an end of the pump shaft extends relatively lower than the rotational axis of the motor shaft; wherein the charge pump is driven by the end of the pump shaft.
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