Pump apparatus and hydraulic actuator

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United States of America Patent

PATENT NO 9856890
SERIAL NO

14491075

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Abstract

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A pump apparatus includes: a pump that ejects a hydraulic fluid; and a selector valve that switches a direction of a flow of the hydraulic fluid to be supplied to one of a first chamber and a second chamber of a cylinder apparatus, which is internally partitioned by a piston into the first chamber extending during an extending stroke of the cylinder apparatus, and the second chamber extending during a shortening stroke of the cylinder apparatus, and the selective valve has, at a channel connected to the second chamber, an orifice that is narrower than a channel connected to the first chamber.

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Patent Owner(s)

Patent OwnerAddress
HITACHI ASTEMO LTDHITACHINAKA

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Kagawa, Atsushi Haga-gun, JP 21 368
Sadakata, Kazuhiko Haga-gun, JP 4 14
Tsutsui, Hayato Haga-gun, JP 28 50

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