GF46.50-P-2300TX Speed-Sensitive Power Steering Steering Angle, Function
GF46.50-P-2300TX Speed-sensitive power steering steering angle, function
Vehicle speed v = 0 km/h
The SPS [PML] solenoid valve is energized to the maximum possible extent and as a result closed against the force of the integral push spring. The pressure ratios in the reaction chambers are identical, since the pressure oil supply is stopped. No force is exerted on the reaction balls (4) and no additional moment is produced on the v-shaped surfaces of the rotary slide (12).
The steering turns easily because the steering moment which the driver must apply to overcome the force of the torsion bar (10) is very low. The oil passes virtually unpressurized via the constant constriction orifice (8) to the supply reservoir of the power steering pump.
Vehicle speed v = 0 to v = 100 km/h
As the speed increases the energizing of the SPS [PML] solenoid valve decreases continuously; this is opened by the force of the integral push spring. The regulated pressure is transmitted via the control spool (9) to the reaction balls (4), which causes the pressure acting on the v-shaped surfaces of the rotary slide (12) to rise. The force on the torsion bar (10) is thus further increased and the driver must operate the steering wheel with a higher steering moment.
The constant throttle bore (8) reduces the regulated pressure from the SPS [PML] solenoid valve. This is then passed on as an almost depressurized backflow to the power steering pump reservoir.
Vehicle speed v > 100 km/h
The SPS [PML] solenoid valve is energized to the minimum extent. As a result via the regulating valve (9) the highest possible pressure is lead from the SPS [PML] solenoid valve to the reaction spheres (4), the pressure applied to the v-shaped surfaces of the rotary valve (12) increasing the most.
The constant throttle bore (8) reduces the regulated pressure from the SPS [PML] solenoid valve. This is then passed on as an almost depressurized backflow to the power steering pump reservoir.
