Title:
HYDRAULIC DRIVE DEVICE FOR CARGO VEHICLE
Document Type and Number:
WIPO Patent Application WO/2015/190307
Kind Code:
A1
Abstract:
This hydraulic drive device (16) is provided with: a hydraulic line (47) that connects an intake port (17a) of a hydraulic pump motor (17) and a bottom chamber (4b) of a lift cylinder (4); and a hydraulic line (49) that connects the hydraulic line (47) and a tank (19). The hydraulic line (49) is provided with a flow rate control valve (50) for controlling the flow rate of hydraulic oil in the direction of return to the tank (19) from the lift cylinder (4). To the upstream side from the flow rate control valve (50), the hydraulic line (49) is provided with a pilot check valve (54) through which the hydraulic oil passes exclusively in the direction of return to the tank (19). The pilot check valve (54) and the hydraulic line (49) to the downstream side from the flow rate control valve (50) are connected through a pilot passage (55). A pilot electromagnetic changeover valve (56) is provided on the pilot passage (55).
Inventors:
UNO TAKASHI (JP)
YOKOMACHI NAOYA (JP)
MATSUO TSUTOMU (JP)
UEDA YUKI (JP)
YOKOMACHI NAOYA (JP)
MATSUO TSUTOMU (JP)
UEDA YUKI (JP)
Application Number:
PCT/JP2015/065442
Publication Date:
December 17, 2015
Filing Date:
May 28, 2015
Export Citation:
Assignee:
TOYOTA JIDOSHOKKI KK (JP)
International Classes:
B66F9/22; F15B21/14
Domestic Patent References:
| WO2006090709A1 | 2006-08-31 |
Foreign References:
| JPH0439300A | 1992-02-10 | |||
| JP5310393B2 | 2013-10-09 | |||
| JPH02163300A | 1990-06-22 | |||
| JPH11165995A | 1999-06-22 |
Attorney, Agent or Firm:
HASEGAWA Yoshiki et al. (JP)
Yoshiki Hasegawa (JP)
Yoshiki Hasegawa (JP)
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