Rotary vane pump with valve to control vane biassing

Details Rotary vane pump with valve to control vane biassing Rotary vane pump with valve to control vane biassing

1989-11-22

1991-06-25

Smith, Leonard E.

Rotary expansible chamber devices

Grooved abutting cylinder-rotating member end surfaces

Groove communicates with vane slot

418268, F04C 2344, F04C 1502

Patent

active

050262637

ABSTRACT:
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.

REFERENCES:
patent: 4386891 (1983-06-01), Riefel et al.
patent: 4488574 (1984-12-01), Bartholomaus
patent: 4516920 (1985-05-01), Shibuya

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