Trochoid type oil pump

Details Trochoid type oil pump Trochoid type oil pump

2007-01-23

2007-01-23

Nguyen, Hoang (Department: 3748)

Rotary expansible chamber devices

Moving cylinder

Rotating

C418S180000, C418S189000

Reexamination Certificate

active

10896021

ABSTRACT:
It is an object of the present invention to provide a trochoid type oil pump in which erosion of the rotor surfaces caused by cavitation is minimized, vibration and noise are reduced, and the structure is greatly simplified. The trochoid type oil pump of the present invention comprises a rotor chamber which has an intake port and a discharge port, an outer rotor, an inner rotor, and shallow grooves which are formed on the side of the initial end portion of the discharge port on the circular circumference of the track of the positions of the bottom portions of the teeth created by the rotation of the outer rotor. In a state in which the sealed spaces formed by the outer rotor, the inner rotor and a partition part between the final end portion of the intake port and the initial end portion of the discharge port are reduced in volume from the maximum volume, the sealed spaces Sa are caused to communicate with the shallow grooves.

REFERENCES:
patent: 3072067 (1963-01-01), Beller
patent: 3635604 (1972-01-01), Petersen et al.
patent: 4767296 (1988-08-01), Satomoto et al.
patent: 5096398 (1992-03-01), Cozens
patent: 5413470 (1995-05-01), Eisenmann
patent: 5518380 (1996-05-01), Fujii et al.
patent: 6544021 (2003-04-01), Watanabe et al.
patent: 5-50595 (1993-07-01), None

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