Oil pump for automatic transmission with effective sealing arran

Details Oil pump for automatic transmission with effective sealing arran Oil pump for automatic transmission with effective sealing arran

1988-03-31

1989-07-25

Smith, Leonard E.

Rotary expansible chamber devices

Moving cylinder

Rotating

74606R, 184612, 184 31, F04B 2100, F04C 1500

Patent

active

048508322

ABSTRACT:
A pump housing is formed with a recess receiving therein pump elements, and a pump cover is secured to the pump housing to close the recess. The pump cover and the pump housing define an interface area therebetween formed with a pump discharge port. The pump casing is provided with a predetermined passage which normally serves as an oil pressure delivering passage, but serving as a drain passage under a condition when the oil pump discharge pressure increases. The predetermined passage is open within said interface area via a groove extending around the pump discharge port.

REFERENCES:
patent: 3053115 (1962-09-01), Cartwright et al.
patent: 4098143 (1978-07-01), Kubo et al.
patent: 4203331 (1980-05-01), Shindo et al.
patent: 4255093 (1981-03-01), Erikson
Service Manual of Automatic Transmission of the RN4F02A Type, RL4F02A Type, pp. 51 to 73; (issued by Nissan Motor Company, Ltd.,); 1984.

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