Steering control system by pilot pressure
AssigneeKabushiki Kaisha Komatsu Seisakusho
InventorsYukyu Yamamoto, Masazumi Oikawa
Life of this patent
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Abstract
A steering control system provides a pilot pressure capable of ensuring excellent responsiveness and light operation force and constant shifting strokes of the control lever even in case of wear of the brake and the clutch. The control lever (1) for use in rightward and leftward steering is directly coupled to the pilot pressure control valve (2) and the pilot pressure control valve (2) is coupled to the clutch piston (4) for ON/OFF operation of the clutch (3) and to the brake cylinder (6) for ON/OFF operation of the brake (5) with piping (10,17). When the control lever (1) is shifted to the right or the left, the pilot pressure control valve (2) at the operation side is actuated to set the associated clutch to OFF and then the associated brake to ON.
Claims8
A steering control system for controlling steering of a vehicle during forward or rearward travelling of said vehicle, said control system utilizing pilot pressure for controlling forward and rearward shifting operations and rightward and leftward steering operations in response to rightward and leftward shifting of a single control lever, said steering control system being characterized in that said single control lever is directly coupled to a pilot pressure control valve, said pilot pressure control valve being coupled by first piping to a clutch piston for ON/OFF operation of a clutch and by second piping to a brake cylinder for ON/OFF operation of a brake.
A steering control system for a traveling vehicle, said steering control system comprising:
- a single control lever for controlling forward and rearward steering operations of the traveling vehicle by forward and rearward shifting of said single control lever and for controlling rightward and leftward steering of the traveling vehicle by rightward and leftward shifting of said single control lever;
- a left clutch system for said traveling vehicle;
- a left brake system for said traveling vehicle;
- a right clutch system for said traveling vehicle;
- a right brake system for said traveling vehicle;
- a pilot pressure valve, said pilot pressure valve having first, second, third and fourth independent operative positions, said first operative position being connected to said left clutch system, said second operative position being connected to said left brake system, said third operative position being connected to said right clutch system, said fourth operative position being connected to
- said right brake system;
- and said single control lever being directly coupled to said pilot pressure control valve to actuate said pilot pressure control valve to one of its operative positions.
Dependencies are inferred from the claim text.