Oil pump having a sealing mechanism for a pumping chamber

Details Oil pump having a sealing mechanism for a pumping chamber Oil pump having a sealing mechanism for a pumping chamber

1994-11-28

1996-03-26

Freay, Charles

Rotary expansible chamber devices

Moving cylinder

Rotating

418 71, F01C 110

Patent

active

055015859

ABSTRACT:
In an oil pump having an inner rotor and an outer rotor supported in a housing, pressure in a pumping chamber whose volume is at maximum presses the inner rotor inwardly and the outer rotor outwardly. An oil groove which communicates with a discharge port via a lubricating groove is formed in an inner surface of the housing at the circumferential position of the pumping chamber whose volume is at maximum. The oil groove has axial sealing surfaces.

REFERENCES:
patent: 3034446 (1962-05-01), Brundage
patent: 3427983 (1969-02-01), Brundage
patent: 4820138 (1989-04-01), Bollinger
patent: 4976595 (1990-12-01), Taniguchi

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