Hydraulic driving system

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 9879405
APP PUB NO 20150292526A1
SERIAL NO

14661629

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ATTORNEY / AGENT: (SPONSORED)

Importance

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Abstract

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To provide a hydraulic driving device configured to smoothly extend a hydraulic cylinder. The present invention includes the open circuit E, the closed circuit A, a control device 57, and a control lever 56a. The open circuit E is provided with a flow passage 202 for connecting an outlet port of the open circuit pump 13 and a head chamber 1a of the boom cylinder 1, a selector valve 44a provided in the flow passage 202, a discharge flow passage 404 for connecting a hydraulic fluid tank 25 and a flow passage 200, and a bleed-off valve 64 provided in the discharge flow passage 404. The control device 57 is configured in such a manner that when a manipulate signal for extending the boom cylinder 1 is input from the control lever 56a, the bleed-off valve 64 is closed, the selector valve 44a is subsequently opened, and the open circuit pump 13 is controlled.

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First Claim

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Patent Owner(s)

Patent OwnerAddress
HITACHI CONSTRUCTION MACHINERY CO LTDTOKYO 110-0015

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Hiraku, Kenji Tsuchiura, JP 44 297
Ishii, Akinori Tsuchiura, JP 26 197
Mizuochi, Mariko Tokyo, JP 12 72
Saitoh, Teppei Tokyo, JP 11 30
Shimizu, Juri Tokyo, JP 11 29
Takahashi, Hiromasa Tsuchiura, JP 90 945

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