A hydraulic steering unit 5 generates a control pressure corresponding to the rotational quantity and rotational direction of the steering wheel 109 on the basis of pressurized oil of a pilot pump 13. Signals of pressure sensors 6a and 6b used to detect the control pressure, and a signal of a front operation detection unit 31, are inputted into a controller 132. A controller 32 and solenoid valves 33a and 33b control a stroke of a steering valve 4 so that the stroke becomes larger with increase in control pressure detected by each of the pressure sensors 6a and 6b. In addition to it, when the operation of a front work device is detected, the controller 32 and the solenoid valves 33a and 33b control the stroke of the steering valve 4 so that the stroke becomes larger than that provided when the operation of the front work device is not detected. As a result, the wheel steering speed is kept at an optimum value in the simultaneous operation of both traveling and the operation of the front work device, and in the operation of traveling only. Therefore, the work efficiency and security can be ensured, and the operability can be also improved.
STEERING SYSTEM FOR WORKING VEHICLE
LENKSYSTEM FÜR EIN NUTZFAHRZEUG
SYSTEME DE DIRECTION POUR VEHICULE DE TRAVAIL
2017-11-15
Patent
Electronic Resource
English
Steering device of working vehicle and method of controlling steering device of working vehicle
European Patent Office | 2018
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