Steering Gear: Description and Operation

LEFT TURN (COUNTERCLOCKWISE)





The power steering oil pump generates the oil pressure and the oil enters into the rotary valve. And the torsion bar is twisted by the force between the steering wheel rotation and the resistance of the tire to the ground.
At a high speed of vehicle, the oil passing the rotary valve comes into the solenoid valve through the lower hole and goes out through the upper hole flowing the connecting space of piston. At this time the piston is back away due to the spring force overcoming the solenoid plunger. The oil flows through the space between the piston and side wall.
And then the oil flows again into the rotary valve and finally drained to reservoir through the drain hole between the rotary valve and the torsion bar. Therefore the oil pump pressure does not affect to the steering effort.
As the vehicle speed decreasing the hole of piston connecting the left chamber and right chamber is gradually closed as the oil pressure produced by oil pump is delivered to the left chamber. Therefore, the steering effort is reduced.

RIGHT TURN (CLOCKWISE)





The operation procedure of right turn is the reverse sequence of left turn.