Nissan Motor Company Limited

Aichi Machine Industry Co., Ltd.

Hiroyoshi Ario

Yoshio Sunohara

Tozo Yamada

Akihiro Morita

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.

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Yokohama, Japan

Hiroyoshi Ario