Patent ID: 6176083
Filing Date: 2001-01-23
Classification: E02F,F04B,F15B

Abstract:
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.