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Patent Searching and Data


Title:
WORK MACHINE
Document Type and Number:
WIPO Patent Application WO/2019/130898
Kind Code:
A1
Abstract:
Provided is a work machine capable of preventing cavitation when a reverse lever operation, which issues an instruction to swing in a direction opposite to a swing direction during swinging deceleration, is performed in a hydraulic closed circuit system. When a swing direction corresponding to swinging speed detected by a speed sensor and a swing direction corresponding to an operation of a swing operation lever are different, a controller controls the rate of a flow supplied from a double-incline hydraulic pump to a swing motor so as to be less than a pump flow rate corresponding to a manipulated variable of the swing operation lever.

Inventors:
KAI Takamasa (6-6, Marunouchi 1-chome, Chiyoda-k, Tokyo 80, 〒1008280, JP)
SAITOU Teppei (HITACHI CONSTRUCTION MACHINERY CO. LTD., 650, Kandatsumachi, Tsuchiura-sh, Ibaraki 13, 〒3000013, JP)
HIRAKU Kenji (HITACHI CONSTRUCTION MACHINERY CO. LTD., 650, Kandatsumachi, Tsuchiura-sh, Ibaraki 13, 〒3000013, JP)
SHIMIZU Juri (6-6, Marunouchi 1-chome, Chiyoda-k, Tokyo 80, 〒1008280, JP)
Application Number:
JP2018/042514
Publication Date:
July 04, 2019
Filing Date:
November 16, 2018
Export Citation:
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Assignee:
HITACHI CONSTRUCTION MACHINERY CO., LTD. (16-1, Higashiueno 2-chome Taito-k, Tokyo 15, 〒1100015, JP)
International Classes:
F15B11/02; E02F9/22; F15B11/08
Foreign References:
JP2017106251A2017-06-15
JP2014005679A2014-01-16
JP2015075171A2015-04-20
JP2015074531A2015-04-20
Attorney, Agent or Firm:
KAICHI IP (3-16, Nihonbashi-muromachi 4-chome Chuo-k, Tokyo 22, 〒1030022, JP)
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