Title:
HYDRAULIC DRIVE DEVICE FOR CARGO VEHICLE
Document Type and Number:
WIPO Patent Application WO/2018/092507
Kind Code:
A1
Abstract:
A hydraulic drive device that comprises a resistance element that increases fluid resistance and is arranged on a descending oil path further to a lift cylinder side than an operation valve. A pilot flow path for a bypass flow control valve is connected to the descending oil path between the lift cylinder and the resistance element. As a result of said configuration, pressure loss that originates at the resistance element can be added to a pilot pressure at the bypass flow control valve, which makes it possible for the pilot pressure to be increased by exactly the amount of the added pressure loss from the resistance element. As a result of the pilot pressure being increased in said manner, the effects of disturbances that destabilize the activity of the bypass flow control valve can be reduced.
Inventors:
UEDA YUKI (JP)
Application Number:
PCT/JP2017/037976
Publication Date:
May 24, 2018
Filing Date:
October 20, 2017
Export Citation:
Assignee:
TOYOTA JIDOSHOKKI KK (JP)
International Classes:
F15B11/044; B66F9/22
Foreign References:
| DE102014105127A1 | 2015-10-15 | |||
| JP2004204974A | 2004-07-22 |
Other References:
See also references of EP 3543544A4
Attorney, Agent or Firm:
ITO Masaki (JP)
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