| 摘要 |
A torque-coupling assembly comprises a rotatable torque-coupling case, a friction clutch assembly for selectively engaging the torque-coupling case and an output shaft, a hydraulic pump for generating a hydraulic fluid pressure, a fluid control passage through which a hydraulic fluid is discharged from the torque-coupling case, and a variable pressure-control valve assembly to selectively control the clutch assembly. The variable pressure-control valve assembly includes a spool valve disposed in the fluid control passage and an electromagnetic actuator. The electromagnetic actuator is provided for producing a variable axial electro-magnetic force acting to the spool valve so as to selectively adjust a position of the spool valve in the fluid control passage in order to selectively control a flow rate of the hydraulic fluid in the fluid control passage.
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