The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 25, 1989
Filed:
Mar. 31, 1988
Applicant:
Inventor:
Kazuya Murota, Ebina, JP;
Assignee:
Nissan Motor Co., Ltd., Yokohama, JP;
Primary Examiner:
Int. Cl.
CPC ...
F04B / ; F04C / ;
U.S. Cl.
CPC ...
418170 ; 7460 / ; 184612 ; 184 31 ;
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.