Title:
CONSTRUCTION MACHINE
Document Type and Number:
WIPO Patent Application WO/2021/256060
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide a construction machine capable of efficiently driving a hydraulic cylinder by an accumulator. Thus, this construction machine comprises a first control valve disposed in a first oil passage connecting a bottom-side oil chamber of a hydraulic cylinder and an accumulator, and a second control valve disposed in a second oil passage connecting a rod-side oil chamber of the hydraulic cylinder and a tank. The construction machine further comprises a third control valve disposed in a third oil passage connecting the rod-side oil chamber and the accumulator, and a fourth control valve disposed in a fourth oil passage connecting an oil passage part of the first oil passage which connects the bottom-side oil chamber and the first control valve, and an oil passage part of the third oil passage which connects the rod-side oil chamber and the third control valve.
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Inventors:
HIJIKATA SEIJI (JP)
TSURUGA YASUTAKA (JP)
HIRAKU KENJI (JP)
HOSHINO MASATOSHI (JP)
TSURUGA YASUTAKA (JP)
HIRAKU KENJI (JP)
HOSHINO MASATOSHI (JP)
Application Number:
PCT/JP2021/014801
Publication Date:
December 23, 2021
Filing Date:
April 07, 2021
Export Citation:
Assignee:
HITACHI CONSTRUCTION MACH CO (JP)
International Classes:
E02F9/22; F15B11/02; F15B11/028; F15B11/08
Domestic Patent References:
| WO2013059020A1 | 2013-04-25 |
Foreign References:
| JP2011069432A | 2011-04-07 | |||
| JP2009275769A | 2009-11-26 | |||
| JP2009275771A | 2009-11-26 |
Other References:
See also references of EP 4098809A4
Attorney, Agent or Firm:
KAICHI IP (JP)
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