Hydraulic control system for work machine

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 10330128
APP PUB NO 20170268540A1
SERIAL NO

15504864

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ATTORNEY / AGENT: (SPONSORED)

Importance

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Abstract

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A work machine including a specific actuator that supplies hydraulic fluid from a plurality of hydraulic pumps includes: first and second hydraulic pumps communicating with a first hydraulic actuator; a first control valve returning hydraulic fluid delivered by the first hydraulic pump to a tank; and a load detection section that detects a load on the first hydraulic actuator. A control valve drive section drives the first control valve such that a communication area between the first hydraulic pump and the tank is enlarged corresponding to an increase in the load on the first hydraulic actuator; and a flow rate control section, during supply of the hydraulic fluid from the first and second hydraulic pumps to the first hydraulic actuator, controls to reduce a delivery flow rate of the first hydraulic pump corresponding to an increase in the load on the first hydraulic actuator.

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Patent Owner(s)

Patent OwnerAddress
HITACHI CONSTRUCTION MACHINERY CO LTD16-1 HIGASHIUENO 2-CHOME TAITO-KU TOKYO 1100015 ?1100015

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Imura, Shinya Toride, JP 80 338
Ishikawa, Kouji Kasumigaura, JP 152 903
Moriki, Hidekazu Mito, JP 39 114
Udagawa, Tsutomu Tsukuba, JP 16 79
Yamashita, Ryohei Tsuchiura, JP 35 225

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