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Rack and Pinion Power Steering A power rack and pinion steering gear is another design of integral power steering The rack functions as the power piston. The tie rods are attached between the rack and the spindle steering arms. The control valve is connected to the pinion gear Operation of the control valve is similar to that for the integral power steering gear When
the steering wheel is turned, the resistance of wheels and the weight of vehicle cause the torsion bar to twist. This twisting causes rotary
valve to move in its sleeve, aligning the
fluid passages for the left, right, or neutral position. Oil pressure exerts force on the piston and helps move the rack to assist the turning effort. The piston is attached directly to the rack. The housing tube functions as the power cylinder. The gear assembly
is always filled with fluid, and all internal components are immersed in fluid. This makes periodic
lubrication unnecessary, and also acts as a cushion to help absorb road shocks. On some rack and pinion power steering gears al fluid passages are internal except for the pressure and return hoses between the gear and pump.
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