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Patent Searching and Data


Title:
HYDRAULIC CONTROLLER FOR WORKING VEHICLE
Document Type and Number:
Japanese Patent JP2000186348
Kind Code:
A
Abstract:

To provide a hydraulic controller for a working 4 vehicle capable of improving the working efficiency by enhancing the excavation capacity even though the excavated soil is hard and of improving the wear resistance of tire.

This controller is equipped with an unload valves 14, 21 which are connected to a working machine circuit 9 upstream of a junction with an aid circuit 13 and drains discharge oil from a second pump 5, booster valves 22, 24 which are connected to a working machine circuit 9a downstream of the junction and raise the setting of the pressure oil of the working machine circuit 9a, and a check valve 17 blocking the back flow of the pressure oil of the working machine circuit 9 to the unload valves 14, 21. When the change gear is shifted down from the second speed step to the first speed step by the operation signal from the shift down switch, the discharge oil of the second pump 5 is drained by the unload valves 14, 21, and the setting of the pressure oil of the working machine circuit 9a is raised by the booster valves 22, 24 by the controller 16 provided.


Inventors:
MORIMOTO KATSUYUKI
NOZAWA YASUHIKO
SAITO HIRONARI
Application Number:
JP1998000376126
Publication Date:
July 04, 2000
Filing Date:
December 21, 1998
Export Citation:
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Assignee:
KOMATSU MFG CO LTD
International Classes:
F15B9/00; E02F9/22; F15B11/028; F15B11/17; (IPC1-7): E02F9/22