Title:
CONSTRUCTION MACHINE
Document Type and Number:
WIPO Patent Application WO/2021/256059
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide a construction machine capable of efficiently driving a hydraulic cylinder by using an accumulator. To this end, this construction machine comprises: a hydraulic cylinder; a first accumulator that stores a return oil from the hydraulic cylinder at a first set pressure; a tank that retains hydraulic oil; a first hydraulic pump that discharges the hydraulic oil sucked in from the tank; a hydraulic actuator driven by the first hydraulic pump; and a second accumulator that stores the return oil from the hydraulic actuator at a second set pressure, wherein: said construction machine further comprises a first control valve disposed in a first oil passage that connects the first accumulator to the hydraulic cylinder, and a second control valve disposed in a second oil passage that connects the second accumulator to the hydraulic cylinder; and the second set pressure is set to a value higher than the first set pressure.
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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/JP2021/014799
Publication Date:
December 23, 2021
Filing Date:
April 07, 2021
Export Citation:
Assignee:
HITACHI CONSTRUCTION MACH CO (JP)
International Classes:
F15B11/02; E02F9/22
Domestic Patent References:
| WO2017170352A1 | 2017-10-05 |
Foreign References:
| JP2016500796A | 2016-01-14 | |||
| JP2015031365A | 2015-02-16 | |||
| JP2012197823A | 2012-10-18 | |||
| JP2009275769A | 2009-11-26 | |||
| JP2009275771A | 2009-11-26 |
Other References:
See also references of EP 4102082A4
Attorney, Agent or Firm:
KAICHI IP (JP)
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