Hydraulic drive system

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United States of America Patent

PATENT NO 9546673
APP PUB NO 20140366521A1
SERIAL NO

14364035

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ATTORNEY / AGENT: (SPONSORED)

Importance

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Abstract

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A hydraulic drive system includes a pump, a steering actuator, a loading/unloading apparatus actuator, a drive device, a relief valve, and an input unit. The drive device: flows hydraulic oil from the pump to the loading/unloading apparatus actuator when an operating tool is operated; flows the hydraulic oil from the pump to the steering actuator when a steering has become an operated state from a non-operated state regardless of an operation of the operating tool; and causes the hydraulic oil from the pump to be discharged to a tank via the relief valve to increase the torque of an engine when an increase instruction is inputted to the input unit and the steering is in a non-operated state.

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First Claim

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Patent Owner(s)

Patent OwnerAddress
HITACHI CONSTRUCTION MACHINERY CO LTD16-1 HIGASHIUENO 2-CHOME TAITO-KU TOKYO 110-0015

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Ito, Makoto Kobe, JP 297 2381
Kodera, Hiroyasu Kobe, JP 11 34
Tanaka, Shinichiro Kakogawa, JP 82 814

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