Power plants – Pressure fluid source and motor – Condition responsive control of motive fluid flow
Patent
1988-07-27
1989-12-19
Look, Edward K.
Power plants
Pressure fluid source and motor
Condition responsive control of motive fluid flow
60487, F16D 3102
Patent
active
048874280
ABSTRACT:
A hydraulic control device for a continuously variable vehicle transmission having a closed hydraulic circuit disposed between a hydraulic pump and a hydraulic motor, with at least one of said hydraulic pump and said hydraulic motor being of the variable displacement type. The hydraulic pump is driven by an engine and the hydraulic motor is connected to the road wheels and is driven by hydraulic pressure from the hydraulic pump. A pair or relief valves are disposed between the two oil passages of the closed hydraulic circuit extending between the hydraulic pump and the hydraulic motor, each of which are for relieving the pressure from one oil passage to the other oil passage. One relief valve relieves the pressure from the oil passage which has the higher pressure when the continuously variable transmission is driven by driving forces from the engine to drive the road wheels, and has a relief pressure setting controlled so as to increase as the speed of rotation of the engine increases. The other relief valve which relieves the pressure from the other oil passage which increases in pressure when said continuously variable transmission receives driving forces from the road wheels, has a relief pressure setting controlled so as to increase as the speed of the motor vehicle increases.
REFERENCES:
patent: 3555817 (1971-01-01), Hann
patent: 4337587 (1982-07-01), Presley
patent: 4776165 (1988-10-01), Iino
Honda Giken Kogyo Kabushiki Kaisha
Look Edward K.
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