Title:
WORK VEHICLE
Document Type and Number:
WIPO Patent Application WO/2021/193156
Kind Code:
A1
Abstract:
In the present invention, a wheel loader (1) comprises: a direction control valve (32); a pilot pump (40) which supplies pilot pressure oil to the directional control valve (32); a first electromagnetic proportional control valve (41) and a second electromagnetic proportional control valve (42) which control the movement of a spool (322) in the axial direction; and a controller (5) which controls the first electromagnetic proportional control valve (41) and the second electromagnetic proportional control valve (42), respectively, wherein when the oil temperature (T) detected by a temperature sensor (60) is equal to or lower than a temperature threshold (Tth) that is set in advance as the temperature at which the fluidity of the pilot pressure oil deteriorates, the controller (5) outputs control signals, for applying the same pilot pressure to a first pilot oil chamber (320L) and a second pilot oil chamber (320R), to the first electromagnetic proportional control valve (41) and the second electromagnetic proportional control valve (42), respectively.
Inventors:
TANAKA SHINICHIRO (JP)
Application Number:
PCT/JP2021/010141
Publication Date:
September 30, 2021
Filing Date:
March 12, 2021
Export Citation:
Assignee:
HITACHI CONSTRUCTION MACH CO (JP)
International Classes:
F15B21/0427; F15B21/045
Foreign References:
| JP2018169004A | 2018-11-01 | |||
| JPS63247133A | 1988-10-13 |
Attorney, Agent or Firm:
THE PATENT BODY CORPORATE TAKEWA INTERNATIONAL PATENT OFFICE (JP)
Download PDF: