Oil pump

Details Oil pump Oil pump

1992-02-18

1993-06-01

Lazarus, Ira S.

Lubrication

Lubricators

Force feed

184 628, 418171, 418182, F16N 1320

Patent

active

052151654

ABSTRACT:
A rotor-type oil pump for supplying lubricating oil to an automotive internal combustion engine. The oil pump is comprised of inner and outer rotors which are rotatably disposed inside a pump casing. The inner rotor is formed with an external gear partly in mesh with an internal gear of the outer rotor. The inner rotor is fixedly mounted on a drive shaft forming part of an engine crankshaft and formed at its inner peripheral surface with at least three flat surface portions which are located at equal intervals in the peripheral direction. The at least three flat surface portions of the inner rotor are fittingly contactable respectively with at least three flat surface portions formed at the peripheral surface of the drive shaft, thereby preventing the inner rotor from shifting radially upon receiving a biasing force (due to a pressure differential) directing to an oil inlet chamber side.

REFERENCES:
patent: 3244111 (1966-04-01), Shelhart
patent: 3697201 (1972-10-01), Eickmann
patent: 3824047 (1974-07-01), McDermott
patent: 4006993 (1977-02-01), Woerlee
patent: 4361419 (1982-11-01), Vohringer
patent: 4820138 (1989-04-01), Bollinger

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