Construction machine

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 11970838
APP PUB NO 20230349132A1
SERIAL NO

17637225

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Importance

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Abstract

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Provided is a construction machine in which travel operability is not impaired when a combined operation is performed in which a single-rod hydraulic cylinder is driven during a travel operation. A hydraulic excavator includes a controller that controls the delivery direction and delivery flow rate of a closed-circuit pump, opens and closes a travel switching valve and an assist switching valve, and controls the delivery flow rate of the open-circuit pump, according to a travel operation lever and a work operation lever. The controller holds the assist switching valve in a closed position irrespective of whether or not the work operation lever is operated in a case where the travel operation lever is operated.

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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 1100015 ?1100015

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Hiraku, Kenji Kasumigaura, JP 60 526
Saitoh, Teppei Mito, JP 25 122
Shimizu, Juri Hitachinaka, JP 22 121
Sugiki, Shohei Kasumigaura, JP 4 6
Takahashi, Hiromasa Abiko, JP 131 1287

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