Oil pump

Rotary expansible chamber devices – Working member has planetary or planetating movement – Plural working members or chambers

Reexamination Certificate

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Details

C418S058000, C418S061100

Reexamination Certificate

active

07435066

ABSTRACT:
The present invention provides an oil pump in which eroding of the inside of the pump due to cavitation and erosion is prevented by minimizing the pressure change in a fluid when inter-tooth spaces formed by an inner rotor and an outer rotor transport the fluid from the intake port to the discharge port. The oil pump comprises: an inner rotor; an outer rotor; an intake port; a discharge port; a transfer side partition part formed between a terminal end of the intake port and a leading end of the discharge port; and a shallow groove which is formed in the transfer side partition part, and which communicates with the discharge port but does not communicate with the intake port. The shallow groove does not intersect with the cell on the transfer side partition part, and is positioned farther inward than the circular locus of the gear bottom parts of the inner rotor. The shallow groove communicates with the cell through a side clearance between the transfer side partition part and the rotor side surfaces of the inner rotor and the outer rotor.

REFERENCES:
patent: 4767296 (1988-08-01), Satomoto et al.
patent: 5145347 (1992-09-01), Freeman
patent: 5413470 (1995-05-01), Eisenmann
patent: 5466137 (1995-11-01), Bierlein et al.
patent: 5516268 (1996-05-01), Kassen et al.
patent: 6544021 (2003-04-01), Watanabe et al.
patent: 7165955 (2007-01-01), Enzaka et al.
patent: 61-138893 (1986-06-01), None
patent: 04-005476 (1992-01-01), None
patent: 2842450 (1998-10-01), None
European Search Report dated Aug. 7, 2007.

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