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In an apparatus and a method for controlling the displacement of a steering pump for a work vehicle, the pressure loss can be decreased and the discharge of the steering pump can effectively be utilized even in a simultaneous operation with a work machine. The apparatus includes a steering gear pref

In an apparatus and a method for controlling the displacement of a steering pump for a work vehicle, the pressure loss can be decreased and the discharge of the steering pump can effectively be utilized even in a simultaneous operation with a work machine. The apparatus includes a steering gear preference flow-dividing valve (20) for supplying an oil quantity from the discharge of the steering pump (2) to a steering operation valve, so that the differential pressure between the input pressure and output pressure of the meter-in opening of the steering operation valve (10) is kept constant. The residual oil quantity is supplied to a work-machine operation valve (17, 18). The operation degree detection means (24), for detecting a degree of operation of the work-machine operation valve, and a work-machine oil-quantity control valve (25) are disposed between the steering gear preference flow-dividing valve and the work-machine operation valve for changing the oil quantity supplied from the steering gear preference flow-dividing valve to the work-machine operation valve, in accordance with an operation degree signal from the operation degree detection means.

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[ What is claimed is:] [1.] An apparatus, for controlling a displacement of a variable displacement steering pump for a work vehicle, comprising:displacement control means;a steering actuator for driving a steering system of said work vehicle;a steering operation valve disposed between said variable

[ What is claimed is:] [1.] An apparatus, for controlling a displacement of a variable displacement steering pump for a work vehicle, comprising:displacement control means;a steering actuator for driving a steering system of said work vehicle;a steering operation valve disposed between said variable displacement steering pump and said steering actuator;a work machine operation valve for operating a work machine actuator, said work machine actuator for driving a work machine;a steering gear preference flow-dividing valve for supplying a quantity of oil from a discharge from said variable displacement steering pump to said steering operation valve;operation degree detection means for detecting a degree of operation of said work machine operation valve; anda work machine oil-quantity control valve, disposed between said steering gear preference flow-dividing valve and said work machine operation valve, for changing said quantity of oil supplied from said steering gear preference flow-dividing valve to said work machine operation valve in accordance with an operation degree signal from said operation degree detection means,wherein said displacement control means controls said displacement so that a differential pressure, between an input pressure and an output pressure of a meter-in opening of said steering operation valve is kept constant; andwherein a residual quantity of oil is supplied to said work machine operation valve. [6.] A method, for controlling a displacement of a variable displacement steering pump for a work vehicle, comprising the steps of:increasing a discharge quantity of oil from said variable displacement steering pump in accordance with a degree of operation of a work machine operation valve;supplying a quantity of oil, corresponding only to the increase in the discharge quantity of oil, to said work machine operation valve.