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:
May. 11, 1999
Filed:
May. 15, 1997
Yoshio Sunohara, Nagoya, JP;
Tozo Yamada, Nagoya, JP;
Akihiro Morita, Nagoya, JP;
Hiroyoshi Ario, Yokohama, JP;
Nissan Motor Co., Ltd., Yokohama, JP;
Aichi Machine Industry Co., Ltd., Nagoya, JP;
Abstract
Hydraulic passages for an oil pump for a speed reducer used in electric vehicle include a first passage for connecting an inlet port of an oil pump to an oil reservoir through a first check valve, a second passage for connecting an outlet port of the oil pump to a discharged-oil demand part through a second check valve, a third passage for connecting the outlet port to the oil reservoir through a third check valve, and a fourth passage for connecting the inlet port to the discharged-oil demand part through a fourth check valve. The check valves are disposed such that, upon normal rotation of the oil pump, the first and second check valves are opened, and upon reverse rotation thereof, the third and fourth check valves are opened.