Rotary expansible chamber devices – With changeable working chamber magnitude – Spring or fluid biased movable member
Patent
1990-12-27
1992-02-25
Bertsch, Richard A.
Rotary expansible chamber devices
With changeable working chamber magnitude
Spring or fluid biased movable member
418 30, F04C 1504
Patent
active
050908812
ABSTRACT:
A variable-displacement vane-pump has a rotor which is rotatably supported by a pump housing in coaxial relationship therewith, and a cam ring interposed between the rotor and the pump housing in eccentric relationship with the pump housing. The rotor has radially outwardly slidable vanes on its outer peripheral surface in contact with an inner surface of the cam ring. Two side plates are disposed on both sides of the vanes, thereby defining pump chambers between every adjacent vanes. An arc-shaped intake port and an arc-shaped exhaust port are formed in one of two side plates, and respectively open into the pump chambers along one side face of the cam ring. In the other side face of the cam ring, a groove is formed except for the region corresponding to the exhaust port, and a partially cut off annular friction ring is disposed within the groove while urged by a seal ring into close contact with the other side plate. A pressure compensating recess having a configuration which conforms to that of the exhaust port and communicating with the pump chambers is formed in the other side face of the cam ring except for the region wherein the groove for the friction ring is formed.
REFERENCES:
patent: 3523746 (1970-08-01), Dadian
Karmel, A. M., "Stability and Regulation of a Variable-Displacement Vane-Pump", Journal of Dynamic Systems Measurement & Control, vol. 110, Jun. 1988, pp. 203-209.
Abe Akiharu
Nakawaki Yasunori
Okuda Ikuo
Suto Satoshi
Suzuki Mikio
Bertsch Richard A.
Cavanaugh David L.
Toyoda Koki Kabushiki Kaisha
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