Hydromechanical coupling with torque-limiting and temperature-se

Details Hydromechanical coupling with torque-limiting and temperature-se Hydromechanical coupling with torque-limiting and temperature-se

1999-01-12

2000-09-05

Marmor, Charles A

192 clutches and power-stop control

Clutches

Operators

192 35, F16H 4826

Patent

active

061128740

ABSTRACT:
A hydraulic coupling is disclosed for use in motor vehicle driveline applications to rotatively couple a pair of rotary members. The hydraulic coupling includes a multi-plate clutch assembly operatively connecting the two rotary members and an actuator assembly for actuating the clutch assembly in response to and as a function of speed differentiation between the two rotary members. The actuator assembly includes a hydraulic pump, a piston disposed in a piston chamber, and a fluid control system for controlling the fluid pressure supplied to the piston chamber by the hydraulic pump to control the clutch engagement force exerted by the piston on the clutch assembly. The fluid control system includes a pressure relief valve operable for limiting the fluid pressure in the piston chamber to a predetermined maximum pressure value. The fluid control system also includes a thermal unload valve operable for releasing the fluid pressure within the piston chamber when the fluid temperature exceeds a predetermined maximum temperature value.

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