| 摘要 |
A device for transmitting torque between two rotatable, coaxial shaft members ( 1, 2 ) contains a clutch ( 35 ) between the two shaft members and engageable-to counteract rotational speed differential between the shaft members-by a hydraulic piston ( 18 ) under the control of an electrically controlled throttle or pressure valve ( 26 ), and a clutch pump ( 36 ) for supplying hydraulic pressure to the hydraulic piston, the clutch pump being driven by either one or both of the shaft members. The hydraulic piston ( 18 ), the valve ( 26 ), and the clutch pump ( 36 ) are connected in a hydraulic system also containing a feeder pump ( 31 ) for maintaining a certain base pressure in the system. The hydraulic system conditionally allows flow from the feeder pump ( 31 ) past the valve ( 26 ) to the hydraulic piston ( 18 ) irrespective of the flow from the clutch pump ( 36 ).
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