Title:
WORKING MACHINE
Document Type and Number:
WIPO Patent Application WO/2019/065925
Kind Code:
A1
Abstract:
The present invention provides a technique for efficiently using energy when simultaneously performing a revolving operation and a boom raising operation. In a specific state in which hydraulic oil is supplied from a first hydraulic pump (2) to a boom cylinder (7a) through a first control valve (6a) and hydraulic oil is supplied from a second hydraulic pump (3) to a revolving motor (7b) through a second control valve (6b) by simultaneously performing an operation of raising a boom (25) and an operation of revolving a revolving body (21), a controller (10) of a hydraulic driving device (60): outputs a command current to open a boom operation pressure cut valve (13) and supplies a portion of the hydraulic oil, supplied from the second hydraulic pump (3) to the revolving motor (7b), to the boom cylinder (7a) through a third control valve (6c) when the revolving motor (7b) has not reached a normal revolving state; and outputs a command current to close the boom operation pressure cut valve (13) when the revolving motor (7b) is in the normal revolving state.
Inventors:
SHIRATO SHU (JP)
SHIRAKAWA YOSHIHIRO (JP)
NARAZAKI AKIHIRO (JP)
KODAKA KATSUAKI (JP)
SHIRAKAWA YOSHIHIRO (JP)
NARAZAKI AKIHIRO (JP)
KODAKA KATSUAKI (JP)
Application Number:
PCT/JP2018/036148
Publication Date:
April 04, 2019
Filing Date:
September 27, 2018
Export Citation:
Assignee:
HITACHI CONSTRUCTION MACH CO (JP)
International Classes:
F15B11/02; E02F9/22; F15B11/028; F15B11/08; F15B11/17
Foreign References:
| JPS5055779A | 1975-05-16 | |||
| JPS6490325A | 1989-04-06 | |||
| JPS5636774U | 1981-04-08 | |||
| JP2005083427A | 2005-03-31 | |||
| JP2007046742A | 2007-02-22 | |||
| JP2015086959A | 2015-05-07 |
Other References:
See also references of EP 3575614A4
Attorney, Agent or Firm:
THE PATENT BODY CORPORATE TAKEWA INTERNATIONAL PATENT OFFICE (JP)
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