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US 4,785,682 AGranted
Power transmission device
AssigneeHonda Giken Kogyo Kabushiki Kaisha
InventorsSadanori Nishimura, Yuji Kishizawa, Yukio Kato
Life of this patent
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AssigneeHonda Giken Kogyo Kabushiki Kaisha
InventorsSadanori Nishimura, Yuji Kishizawa, Yukio Kato
Estimating the term…
A power transmission device for use in a motor vehicle in which an engine is mounted on the front part and a transmission case is mounted on the rear part of the vehicle. A plurality of shifting shafts are axially supported within the transmission case in parallel with one another. Between these shift shafts, a plurality of shifting gear trains, which are engaged and disengaged by a hydraulic clutch, are provided. One of the shifting shafts is connected to the output side of a wet multi-disc main clutch which is disposed in a separate chamber within the transmission case. The input side of the clutch is connected to the engine. An oil pump is disposed within the transmission case. Oil discharged from the pump is controlled by a control valve and is then supplied to the respective oil clutches and bearings through an oil passage disposed along the wall of the transmission case and an oil passage disposed in the axial direction within the shifing shaft. The engine power, which is changed in speed, is transmitted to the front wheels through a front wheel drive shaft and also transmitted to an agricultural machinery through a PTO shaft.
A multistage gear shifting device for a motor vehicle in which first speed to fourth speed gear trains and reverse gear trains are arranged between two shafts in an order such that a low speed gear train comes first, one gear of each gear train being able to engage with and disengage from one of the two shafts through a hydraulic clutch, the gear shifting device including a manual valve which has operating positions correspnding to first speed to fourth speed and reverse and which is adapted to selectively operate hydraulic clutches for the respective gear trains, said one gear of the fourth speed gear train and one gear of the reverse gear train being integrally formed with each other and loosely fitting on said one of said two shafts and detachably engaged with said one of said two shafts through a common hydraulic clutch, the other gears of the fourth speed and reverse gear trains being loosely fitting on said other shaft, said multistage gear shifting device including a selector for selectively engaging said other gears of the fourth speed and reverse gear trains, an actuator for actuating said selector in response to the action of said manual valve, and a switching valve annexed to said actuator, said switching valve guiding hydraulic oil from said manual valve to said common hydraulic clutch when said manual valve is brought to an operating position corresponding to fourth speed or reverse and discharging the hydraulic oil in said common hydraulic clutch to a drain through said manual valve when said manual valve is brought to another operating position, said selector engaging said other gears of said reverse gear train to said other shaft when said manual valve is in an operating position corresponding to first speed, second speed, or reverse, and engaging said other gears of said fourth speed gear train to said other shaft when said manual valve is in an operating position corresponding to third speed or fourth speed.
A power transmission device for use in a motor vehicle in which an engine is mounted on the front part and a transmission case is mounted on the rear part thereof, comprising:
A power transmission device for use in a motor vehicle in which an engine is mounted on the front part and a transmission case is mounted on the rear part thereof, comprising:
Dependencies are inferred from the claim text.