Hydraulic pressure control device for clutch for controlling dri

Details Hydraulic pressure control device for clutch for controlling dri Hydraulic pressure control device for clutch for controlling dri

1988-12-07

1989-08-22

Michalsky, Gerald A.

Fluid handling

Systems

Supply and exhaust

91 32, 192 85R, F15B 13043

Patent

active

048586463

ABSTRACT:
The hydraulic pressure for operating the two wheel drive/four wheel drive switchover clutch in the part-time type four wheel drive device or the central differential lock-up clutch in the full-time type four wheel drive device is produced by a combination of a pressure regulation valve and two switchover valves to be selectable among several substantially different pressure levels so that the four wheel drive device can be quickly switched over between the complete four wheel operation and the complete two wheel operation, including one or more intermediate half clutched incomplete four wheel operation.

REFERENCES:
patent: 3823621 (1974-07-01), Kubo et al.

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