Title:
HYDRAULIC DRIVE DEVICE FOR INDUSTRIAL VEHICLE
Document Type and Number:
WIPO Patent Application WO/2019/087687
Kind Code:
A1
Abstract:
This hydraulic drive device is provided with: a capacity control valve that controls a variable capacity pump; a PS valve that is disposed between the variable capacity pump and a PS cylinder; a lift valve that is disposed between the variable capacity pump and a lift cylinder; a hydraulic oil flow path through which the variable capacity pump and the PS valve are connected; a hydraulic oil flow path through which the variable capacity pump and the lift valve are connected; and a pilot line through which the lift valve and the capacity control valve are connected. A groove is provided to a spool of the lift valve and said groove constitutes a connection path for connecting, when the PS valve is at a neutral position, the hydraulic oil path with the pilot line at the neutral position of the lift valve.
Inventors:
UNO TAKASHI (JP)
YOKOMACHI NAOYA (JP)
UEDA YUKI (JP)
MATSUO TSUTOMU (JP)
YOKOMACHI NAOYA (JP)
UEDA YUKI (JP)
MATSUO TSUTOMU (JP)
Application Number:
PCT/JP2018/037316
Publication Date:
May 09, 2019
Filing Date:
October 05, 2018
Export Citation:
Assignee:
TOYOTA JIDOSHOKKI KK (JP)
International Classes:
B62D5/07; B62D5/065; B62D5/08; B66F9/22
Foreign References:
| JPH03204375A | 1991-09-05 | |||
| JP2009019660A | 2009-01-29 | |||
| US4573319A | 1986-03-04 |
Attorney, Agent or Firm:
SATO Tsutomu et al. (JP)
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