초록 ▼

A flow control system for use in a power steering apparatus including a fluid cylinder for amplifying the manual steering torque and a control valve associated therewith. The flow control system is installed in a pressure fluid feed line which feeds fluid from a hydraulic pump to the fluid cylinder

A flow control system for use in a power steering apparatus including a fluid cylinder for amplifying the manual steering torque and a control valve associated therewith. The flow control system is installed in a pressure fluid feed line which feeds fluid from a hydraulic pump to the fluid cylinder via the control valve. The system comprises a parallel combination of a fixed restrictor and a variable restrictor, and a vehicle speed response control device comprising a stepping motor for changing the amount of restriction of the variable restrictor by rotating the restrictor by a specific angle, a vehicle speed sensor for producing an electric signal in response to the increase and decrease of the vehicle speed, and a stepping motor control device for controlling the angle of rotation of the stepping motor by means of the electric signal from the sensor to control the amount of restriction of the variable restrictor so as to control the flow rate of pressure fluid to the control valve and fluid cylinder, thereby improving the stability of steering.

대표청구항 ▼

A flow control system for use in a power steering apparatus including a fluid cylinder for amplifying the manual steering torque and a control valve associated therewith, a hydraulic pump for feeding pressure fluid to said fluid cylinder via said control valve, a pressure fluid feed line extending f

A flow control system for use in a power steering apparatus including a fluid cylinder for amplifying the manual steering torque and a control valve associated therewith, a hydraulic pump for feeding pressure fluid to said fluid cylinder via said control valve, a pressure fluid feed line extending from said hydraulic pump to said control valve, a fixed restrictor for fixing a flow rate installed in said pressure fluid feed line, a variable restrictor for providing a variable flow rate installed in said pressure fluid feed line in parallel relation to said fixed restrictor, and vehicle speed-responsive control means for controlling the amount of restriction of said variable restrictor in response to the increase and decrease of the vehicle speed, said vehicle speed-responsive control means comprising: a stepping motor for changing the amount of restriction of said variable restrictor by rotating said restrictor by a specific angle, a vehicle speed sensor which produces electric signals corresponding to the vehicle speed, and a stepping motor control device for controlling the angle of rotation of said stepping motor by actuation of exciting coils thereof by means of the electric signals from said sensor.