Title:
掘削機及び林業機械のレベリング装置用油圧システム
Document Type and Number:
Japanese Patent JP5259366
Kind Code:
B2
Abstract:
A hydraulic system for a leveling apparatus in excavator and forestry equipment is provided, whereby an upper frame of the equipment is kept in a horizontal state even if a lower frame of the equipment is on an inclined ground against a horizontal surface H. The hydraulic system a pair of first and second actuators and a pair of third and fourth actuators for rocking the lower part of the upper frame, first leveling control valves for simultaneously controlling extension and contraction of the first and second actuators, second leveling control valves for simultaneously controlling extension and contraction of the third and fourth actuators a reducing valve for discharging a reducing pilot signal pressure, and flow control valves for discharging the pilot signal pressure for the spool shifting of the first and second leveling control valves when a control signal is applied from a preset leveling controller.
Inventors:
Han Ok Choi
Application Number:
JP2008316690A
Publication Date:
August 07, 2013
Filing Date:
December 12, 2008
Export Citation:
Assignee:
Volvo Construction Equipment Arbor
International Classes:
E02F9/10; B60P3/00; E02F5/00
Domestic Patent References:
| JP2002242226A | ||||
| JP55138523A | ||||
| JP62049004A | ||||
| JP2007170485A |
Attorney, Agent or Firm:
Kazuo Shigenobu
Hideo Shimizu
Yuichi Takagi
Yoshinao Nakano
Hideki Akiba
Hideo Shimizu
Yuichi Takagi
Yoshinao Nakano
Hideki Akiba