IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
UP-0831307
(2004-04-26)
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등록번호 |
US-7621353
(2009-12-02)
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우선권정보 |
JP-2003-119876(2003-04-24); JP-2003-120075(2003-04-24); JP-2003-135969(2003-05-14) |
발명자
/ 주소 |
- Ishii, Norihiro
- Ohashi, Ryota
|
출원인 / 주소 |
- Kanzaki Kokyukoki Mfg. Co., Ltd.
|
대리인 / 주소 |
Sterne, Kessler, Goldstein & Fox P.L.L.C.
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인용정보 |
피인용 횟수 :
20 인용 특허 :
5 |
초록
▼
A vehicle transmission having a pair of left and right HSTs for driving respective axles is applicable for a riding lawn mower. The transmission comprises a center casing incorporating a distributing drive train. In the fore-and-aft direction, an input shaft of the distributing drive train projects
A vehicle transmission having a pair of left and right HSTs for driving respective axles is applicable for a riding lawn mower. The transmission comprises a center casing incorporating a distributing drive train. In the fore-and-aft direction, an input shaft of the distributing drive train projects from the center casing toward a prime mover, and a PTO shaft for driving a mower unit projects from the center casing opposite to the prime mover. A pair of left and right deceleration drive train casings for incorporating respective deceleration gear trains and supporting the respective axles are disposed on respective left and right sides of the center casing. A pair of left and right stepless transmission mechanisms, each of which is drivingly interposed between the distributing drive train and each of the deceleration gear trains in the deceleration gear train casings, are mounted on left and right side portions of the center casing opposite to the prime mover in the fore-and-aft direction.
대표청구항
▼
What is claimed is: 1. A vehicle transmission, comprising: a transmission casing incorporating a distributing drive train; an input shaft of said distributing drive train in said transmission casing, said input shaft being disposed in the substantially laterally middle portion of said transmission
What is claimed is: 1. A vehicle transmission, comprising: a transmission casing incorporating a distributing drive train; an input shaft of said distributing drive train in said transmission casing, said input shaft being disposed in the substantially laterally middle portion of said transmission casing so as to project from said transmission casing toward a prime mover in the fore-and-aft direction of the vehicle; a pair of left and right lateral axles; a pair of left and right HSTs, each of said HSTs drivingly interposed between said distributing drive train in said transmission casing and each of said axles, each of said HSTs including: a hydraulic pump having an axial pump shaft, wherein said pump shafts of both said left and right HSTs are drivingly connected to said distributing drive train so as to receive power from said distributing drive train, a hydraulic motor having an axial motor shaft perpendicular to said pump shaft, wherein said motor shaft of said left HST is extended coaxially to said left axle and is drivingly connected to said left axle so as to transmit power from said left HST to said left axle, and said motor shaft of said right HST is extended coaxially to said right axle and is drivingly connected to said right axle so as to transmit power from said right HST to said right axle, and an oil duct plate disposed in said transmission casing, wherein said hydraulic pump and motor are mounted onto said oil duct plate to be fluidly connected to each other; and a PTO shaft for taking off power from said distributing drive train disposed in a substantially lateral middle portion of said transmission casing and projecting from said transmission casing opposite to said prime mover in the fore-and-aft direction of the vehicle. 2. The vehicle transmission as set forth in claim 1, further comprising: a PTO clutch disposed in a portion of said transmission casing opposite to said prime mover in the fore-and-aft direction of the vehicle, said PTO clutch being drivingly interposed between said distributing drive train and said PTO shaft. 3. The vehicle transmission as set forth in claim 1, further comprising: a pair of motor casings incorporating said respective hydraulic motors, said motor casings being mounted on respective left and right sides of said transmission casing. 4. The vehicle transmission as set forth in claim 1, further comprising: a pair of deceleration drive trains, each of which is drivingly interposed between said corresponding motor shaft and said corresponding axle, wherein each of said deceleration drive trains has a pinion coaxial to said corresponding motor shaft. 5. The vehicle transmission as set forth in claim 4, wherein said motor shafts are supported by said respective motor casings, and wherein each of said pinions is disposed between said corresponding motor shaft and said corresponding axle. 6. The vehicle transmission as set forth in claim 1, wherein said transmission casing is constituted by a front casing part and a rear casing part joined to each other. 7. The vehicle transmission as set forth in claim 1, wherein said hydraulic pumps are mounted onto vertical surfaces of laterally extended portions of said oil duct plate so as to extend said pump shafts in the fore-and-aft direction, and wherein said hydraulic motors are mounted onto laterally outward vertical surfaces of portions of said oil duct plate extended in the fore-and-aft direction so as to extend said motor shafts laterally outward. 8. A vehicle transmission, comprising: a transmission casing including a pair of left and right HST chambers, a distributing drive train chamber interposed between said left and right HST chambers, and a PTO drive train chamber, wherein: left and right portions of said transmission casing constituting said respective left and right HST chambers are extended toward a prime mover in the fore-and-aft direction of a vehicle, a portion of said transmission casing constituting said PTO drive train chamber is extended opposite to said prime mover in the fore-and-aft direction of the vehicle, and said transmission casing is provided with an outside space recessed toward a portion of said transmission casing constituting said distributing drive train chamber between said left and right portions of said transmission casing constituting said respective left and right HST chambers; a distributing drive train disposed in said distributing drive train chamber of said transmission casing; an input shaft of said distributing drive train projecting from said portion of said transmission casing constituting said distributing drive train chamber into said recessed outside space toward said prime mover in the fore-and-aft direction of the vehicle; a pair of left and right lateral axles supported by laterally distal ends of said left and right portions of said transmission casing constituting said respective HST chambers; a pair of left and right HSTs disposed in said respective HST chambers, each of said HSTs drivingly interposed between said distributing drive train and each of said axles, each of said HSTs including: a hydraulic pump having an axial pump shaft, wherein said pump shafts of both said left and right HSTs are drivingly connected to said distributing drive train so as to receive power from said distributing drive train, a hydraulic motor having an axial motor shaft perpendicular to said pump shaft, wherein said motor shaft of said left HST is drivingly connected to said left axle so as to transmit power from said left HST to said left axle, and said motor shaft of said right HST is drivingly connected to said right axle so as to transmit power from said right HST to said right axle, and an oil duct plate disposed in said transmission casing, wherein said hydraulic pump and motor are mounted onto said oil duct plate to be fluidly connected to each other; and a PTO shaft for taking off power from said distributing drive train disposed in said portion of said transmission casing constituting said PTO drive train chamber, and projecting from said transmission casing opposite to said prime mover in the fore-and-aft direction of the vehicle. 9. The vehicle transmission as set forth in claim 8, further comprising: a PTO clutch disposed in said PTO drive train chamber of said transmission casing opposite to said prime mover in the fore-and-aft direction of the vehicle, said PTO clutch being drivingly interposed between said distributing drive train and said PTO shaft. 10. The vehicle transmission as set forth in claim 8, further comprising: a pair of motor casings serving as said left and right portions of said transmission casing constituting said respective left and right HST chambers, and incorporating said respective hydraulic motors, said motor casings being mounted on respective left and right sides of said portion of said transmission casing constituting said distributing drive train chamber. 11. The vehicle transmission as set forth in claim 10, wherein said motor shafts are supported by said respective motor casings so as to be disposed coaxially to said respective axles. 12. The vehicle transmission as set forth in claim 8, further comprising: a pair of deceleration drive trains, each of which is drivingly interposed between said corresponding motor shaft and said corresponding axle, wherein each of said deceleration drive trains has a pinion coaxial to said corresponding motor shaft. 13. The vehicle transmission as set forth in claim 12, wherein said motor shafts are supported by said respective motor casings so as to be disposed coaxially to said respective axles, and wherein each of said pinions is disposed between said corresponding motor shaft and said corresponding axle. 14. The vehicle transmission as set forth in claim 8, wherein said transmission casing is constituted by a front casing part and a rear casing part joined to each other. 15. The vehicle transmission as set forth in claim 8, wherein said hydraulic pumps are mounted onto vertical surfaces of laterally extended portions of said oil duct plate so as to extend said pump shafts in the fore-and-aft direction, and wherein said hydraulic motors are mounted onto laterally outward vertical surfaces of portions of said oil duct plate extended in the fore-and-aft direction so as to extend said motor shafts laterally outward. 16. A vehicle transmission, comprising: a transmission casing incorporating a distributing drive train; an input shaft of said distributing drive train in said transmission casing, said input shaft being disposed in the substantially laterally middle portion of said transmission casing so as to project from said transmission casing toward a prime mover in the fore-and-aft direction of the vehicle; a pair of left and right lateral axles; a pair of left and right HSTs, each of said HSTs drivingly interposed between said distributing drive train in said transmission casing and each of said axles, each of said HSTs including: a hydraulic pump having an axial pump shaft, wherein said pump shafts of both said left and right HSTs are drivingly connected to said distributing drive train so as to receive power from said distributing drive train, a hydraulic motor having an axial motor shaft perpendicular to said pump shaft, wherein said motor shaft of said left HST is drivingly connected to said left axle so as to transmit power from said left HST to said left axle, and said motor shaft of said right HST is drivingly connected to said right axle so as to transmit power from said right HST to said right axle, and an oil duct plate disposed in said transmission casing, wherein said hydraulic pump and motor are mounted onto said oil duct plate to be fluidly connected to each other; and a PTO shaft for taking off power from said distributing drive train disposed in a substantially lateral middle portion of said transmission casing and projecting from said transmission casing opposite to said prime mover in the fore-and-aft direction of the vehicle; wherein said hydraulic pump of each of said HSTs is located between said prime mover and said distributing drive train in the fore-and-aft direction of the vehicle. 17. The vehicle transmission as set forth in claim 16, further comprising: a PTO clutch disposed in a portion of said transmission casing opposite to said prime mover in the fore-and-aft direction of the vehicle, said PTO clutch being drivingly interposed between said distributing drive train and said PTO shaft. 18. The vehicle transmission as set forth in claim 16, further comprising: a pair of motor casings incorporating said respective hydraulic motors, said motor casings being mounted on respective left and right sides of said transmission casing. 19. The vehicle transmission as set forth in claim 18, wherein said motor shafts are supported by said respective motor casings so as to be disposed coaxially to said respective axles. 20. The vehicle transmission as set forth in claim 16, further comprising: a pair of deceleration drive trains, each of which is drivingly interposed between said corresponding motor shaft and said corresponding axle, wherein each of said deceleration drive trains has a pinion coaxial to said corresponding motor shaft. 21. The vehicle transmission as set forth in claim 20, wherein said motor shafts are supported by said respective motor casings so as to be disposed coaxially to said respective axles, and wherein each of said pinions is disposed between said corresponding motor shaft and said corresponding axle. 22. The vehicle transmission as set forth in claim 16, wherein said transmission casing is constituted by a front casing part and a rear casing part joined to each other. 23. The vehicle transmission as set forth in claim 16, wherein said hydraulic pumps are mounted onto vertical surfaces of laterally extended portions of said oil duct plate so as to extend said pump shafts in the fore-and-aft direction, and wherein said hydraulic motors are mounted onto laterally outward vertical surfaces of portions of said oil duct plate extended in the fore-and-aft direction so as to extend said motor shafts laterally outward.
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