| 摘要 |
An oil pump of vane type is disclosed. Plates which hold a rotor and a cam ring therebetween have a groove formed in their suction region to allow a discharged oil to be introduced into such groove. The plates are also formed with a groove in their discharge region which communicates with the groove in the suction region through an orifice. The oil in these grooves act upon the back side of the vane to urge it into abutment against the cam ring. A passage is provided for connecting the groove in the discharge region to a low pressure side of the pump, and a valve opens or closes the passage to enable the pumping action to be turned on and off.
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