Title:
WORK MACHINE
Document Type and Number:
WIPO Patent Application WO/2021/059775
Kind Code:
A1
Abstract:
A hydraulic excavator 1 is provided with: an engine 16; a main hydraulic pump 17 driven by the engine 16; a plurality of hydraulic actuators driven by pressure oil discharged from the main hydraulic pump 17; a plurality of flow rate control valves for controlling the flow rate of the pressure oil supplied from the main hydraulic pump 17 to the hydraulic actuators; a pilot hydraulic pump 18 for supplying pressure oil for driving the flow rate control valves; and a control device 15 for controlling the discharge flow rate of the pilot hydraulic pump 18. The control device 15 controls the discharge flow rate of the pilot hydraulic pump 18 so as to equal the sum of requested pilot flow rates determined in accordance with a control command to the flow rate control valves, and a preset standby flow rate.
Inventors:
CHIBA TAKAAKI (JP)
KUMAGAI KENTO (JP)
IMAI YUSUKE (JP)
KUMAGAI KENTO (JP)
IMAI YUSUKE (JP)
Application Number:
PCT/JP2020/030335
Publication Date:
April 01, 2021
Filing Date:
August 07, 2020
Export Citation:
Assignee:
HITACHI CONSTRUCTION MACH CO (JP)
International Classes:
F15B11/08; E02F9/22
Domestic Patent References:
| WO2019049435A1 | 2019-03-14 |
Foreign References:
| JP4601635B2 | 2010-12-22 | |||
| JP2017061795A | 2017-03-30 | |||
| JPH0293102A | 1990-04-03 | |||
| JPH04290603A | 1992-10-15 | |||
| US20060147315A1 | 2006-07-06 | |||
| JP2019174623A | 2019-10-10 | |||
| JP4601635B2 | 2010-12-22 | |||
| JP2017061795A | 2017-03-30 |
Other References:
See also references of EP 3919755A4
Attorney, Agent or Firm:
HIRAKI & ASSOCIATES (JP)
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