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Patent Searching and Data


Title:
CONSTRUCTION MACHINE
Document Type and Number:
WIPO Patent Application WO/2021/039805
Kind Code:
A1
Abstract:
Provided is a construction machine in which traveling operability is not compromised when a compound action is performed in which a single-rod hydraulic cylinder is driven during a travel action. A hydraulic shovel comprises a controller that controls the discharge direction and discharge flow rate of a closed-circuit pump in accordance with a travel operation lever and a work operation lever, and opens and closes a travel switching valve and an assist switching valve to control the discharge flow rage of the closed-circuit pump. When the travel operation lever is operated, the controller holds the assist switching valve in a closed position irrespective of whether the work operation lever is operated.

Inventors:
SUGIKI SHOHEI (JP)
HIRAKU KENJI (JP)
TAKAHASHI HIROMASA (JP)
SAITOH TEPPEI (JP)
SHIMIZU JURI (JP)
Application Number:
PCT/JP2020/032072
Publication Date:
March 04, 2021
Filing Date:
August 25, 2020
Export Citation:
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Assignee:
HITACHI CONSTRUCTION MACH CO (JP)
International Classes:
F15B11/02; E02F9/22; F15B11/08
Foreign References:
JP2015048899A2015-03-16
JP2013245787A2013-12-09
JP2015203453A2015-11-16
JP2015227544A2015-12-17
JP2016118281A2016-06-30
JPH11141504A1999-05-25
Attorney, Agent or Firm:
KAICHI IP (JP)
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