Title:
WORK MACHINE
Document Type and Number:
WIPO Patent Application WO/2021/193157
Kind Code:
A1
Abstract:
Provided is a work machine capable of maintaining the control accuracy of an actuator irrespective of the temperature fluctuation of hydraulic oil passed through a flowrate control device that controls a supply flowrate to the actuator. The flowrate control device has: a valve body that is disposed on a main oil path for connecting a discharge line of a hydraulic pump and the actuator and that moves in accordance with operation pressure from a solenoid proportional pressure-reducing valve; a sampling oil path that branches from the main oil path; and a temperature sensor that is installed on the sampling oil path. A controller corrects a command electrical signal to the solenoid proportional pressure-reducing valve in response to a signal from the temperature sensor.
Inventors:
KUMAGAI KENTO (JP)
IMURA SHINYA (JP)
TSURUGA YASUTAKA (JP)
CHIBA TAKAAKI (JP)
AMANO HIROAKI (JP)
NISHIKAWA SHINJI (JP)
NARAZAKI AKIHIRO (JP)
IMURA SHINYA (JP)
TSURUGA YASUTAKA (JP)
CHIBA TAKAAKI (JP)
AMANO HIROAKI (JP)
NISHIKAWA SHINJI (JP)
NARAZAKI AKIHIRO (JP)
Application Number:
PCT/JP2021/010147
Publication Date:
September 30, 2021
Filing Date:
March 12, 2021
Export Citation:
Assignee:
HITACHI CONSTRUCTION MACH CO (JP)
International Classes:
F15B21/045; E02F9/22
Foreign References:
| JP2003247504A | 2003-09-05 | |||
| JP2019215009A | 2019-12-19 | |||
| JPH02190604A | 1990-07-26 | |||
| JP2014534381A | 2014-12-18 | |||
| JP2014126176A | 2014-07-07 |
Other References:
See also references of EP 4001670A4
Attorney, Agent or Firm:
KAICHI IP (JP)
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