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Hydraulic Power Steering

A torsion bar in the steering shaft controls the hydraulics.

Purely hydraulic equipment has also to be controlled. As one can see above, it's also, not quite that simple to understand. The shaft coming from the steering wheel ends in a small, turnable piston. The steering movement is then transfered to a rod, which in itself is twistable, and which is fastened further behind, to the cylinder which surrounds the piston. It has a direct connection with the steering gear.

Slight turning of the steering wheel -> Hydraulic circulation

Looking at it from the center position (see figure 1). Here, neither of the two drillings in the piston align yet with any line in the cylinder at all. Even slight rotary movements of the steering wheel, (see figures 2 and 3) provide for connections of the hydraulic pump with one side, and the container with the other side of the working cylinder. This is only possible if part of the shaft completely inside, is twisted slightly. From this point onwards, the force which supports the steering movements, is also preset.

Normal steering -> Rotation of piston and cylinder

Each small steering movement causes a flow of hydraulic oil to the working cylinder. At the same time, the pressure on the other side of the working piston, must be able to escape to the equipment reservoir. Of course, this functions also with normal steering movements. However, on this occasion, the cylinder must also rotate. The four connections, to the pre-flow and the flow-back of the working cylinder, and to the pump or to the container are guaranteed because the drillings in the cylinder are connected through ring-slots with the permanent lines and are individually sealed through rubber rings. 08/07

If the turning of the steering wheel through the steering gear is completed, the hydraulic support stops.