Hydraulic pressure supply system for variable torque transfer of

Details Hydraulic pressure supply system for variable torque transfer of Hydraulic pressure supply system for variable torque transfer of

1994-10-11

1997-07-08

Nguyen, Hoang

Power plants

Pressure fluid source and motor

Having a mechanical clutch or brake device in the power train

60437, 192109F, F16D 3102

Patent

active

056449160

ABSTRACT:
A hydraulic pressure supply system for a variable torque transfer of a four-wheel drive vehicle in which a driving-torque distribution ratio between front and rear road wheels is varied by adjusting a clutch pressure applied to a variable torque clutch assembled in said transfer, comprises an oil pressure source supplying a pressurized working fluid into a hydraulic line, at least one pressure regulating valve fluidly connected to the line for decreasingly regulating the pressurized working fluid at a predetermined clutch pressure, and a directional control valve fluidly connected to the pressure regulating valve for directing the clutch pressure to a transfer clutch. An electromagnetic solenoid valve is provided for controlling the pressure regulating valve and the directional control valve for selectively supplying one of a stand-by pressure and a clutch engaging pressure to the transfer clutch. The stand-by pressure is set to be slightly less than a predetermined pressure level at which the transfer clutch starts to engage.

REFERENCES:
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patent: 4915189 (1990-04-01), Sakai
patent: 4915190 (1990-04-01), Iwata
patent: 5010974 (1991-04-01), Matsuda

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