4610-01
1. OVERVIEW
When a driver turns the steering wheel, the front wheels are steered and the vehicle moves to the desired
direction. However, there is a certain limitation to increase the steering efficiency only with the mechanical
methods. A steering system using hydraulic pressure has been introduced to decrease the driver's
steering effort while using the normal gear ratio.
The power steering system consists of pump, oil reservoir, rack and gear box.
The power steering pump is a vane type and delivers hydraulic pressure to operate the power steering
system. The pressure relief valve in the pump controls the discharging pressure.
The rotary control valve in the rack and pinion gear directs the oil from the power steering pump to one
side of the rack piston. The integrated rack piston converts the hydraulic pressure to linear movement.
The operating force of the rack moves the wheels through the tie rod, the tie rod end and the steering
knuckle. Even though the hydraulic pressure cannot be generated, a driver can steer the vehicle without
power assist but it needs very high steering force.
In this case, the operating force of the steering wheel is conveyed to the pinion, and the movement of the
pinion moves the rack through the pinion gear combined to the rack gear.
2. SPECIFICATIONS
Description Specification
Steering wheel Type 4-spoke type
Outer diameter 390 mm
Steering gear box Type Rack and pinion
Gear ratio
Steering angle Inner
Outer
Oil pump Type Vane type
Maximum pressure
Displacement
Pulley size 124 mm
Tilt column adjusting angle Up
Down
Minimum turning radius 5.6
Oil Specification S-PSF3
Capacity
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