Title:
HYDRAULIC STEERING DEVICE AND HYDRAULIC VALVE THEREOF
Document Type and Number:
Japanese Patent JP3695909
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To make an actual steering angle follow up a target steering angle by comprising an electromagnetic variable pressure reducing valve which can change the oil pressure from a pilot valve to a main steering valve, by receiving the exciting current from an exciting current output means.
SOLUTION: A variable pressure reducing valve C2 reduces the pressure of the pressure oil from a pilot oil pressure source C1 while compensating the minimum pressure, and supplies the pressure oil to a rotary pilot valve C3. A second variable pressure reducing valve C22 is an electromagnetic pressure reducing valve which can change the energization force of a spring for setting the reduction of pressure by the electromagnetic force, and receives the exciting current I from a controller B. The rotary pilot valve C3 is a positioning direction changing valve having a pump port PR1, a drain port PD1 and the left and right output ports PL1, PR1 on a neutral position Np, a left steering position Lp and a right steeping position Rp. Whereby the change of the pilot pressure is inhibited, and the generation of shock at the start and finish of the steering can be inhibited.
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Inventors:
Masanori Ikari
Application Number:
JP28265397A
Publication Date:
September 14, 2005
Filing Date:
September 30, 1997
Export Citation:
Assignee:
KOMATSU LTD.
International Classes:
B62D6/00; B62D5/06; B62D5/07; B62D5/08; B62D5/09; B62D12/00; B62D101/00; B62D113/00; (IPC1-7): B62D5/09; B62D5/07; B62D6/00
Domestic Patent References:
| JP4176777A | ||||
| JP63291772A |