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Four-wheel Steering - mechanical



Assignment

The task cannot be solved all that easily. Through a connection between the gear-racks of the front- and rear axle, this should, at first, steer slightly against, and then withthe front axle. This may be easier to solve electrically than mechanically. Especially also if one considers, that the first steering movement should be very slight and the secondparticularly sharp.

Function

The problem is solved with parts of the planetary gearbox, in this case, in front of the rear axle. In this case, only one ring-gear, mounted in the casing, works together with arelatively large planet wheel. The planetary gear is driven directly from the steering shaft through a suitably designed crank pin. Should the steering shaft turn, it then runsalong the internal teeth of the stationary ring-gear. Doing so, its axle carries out a circular motion.An eccentric wave-shaped part is attached to the planetary gear. One could describe it as the crankpin of the planetary gear. If this is now moved a little to one side, the pin,with the axle of the planetary wheel, carries out a movement in the same direction, from which however, its own rotation must be still be subtracted. If, however, the planetwheel slowly reaches the edge of the ring gear, then its axle has no lateral movement and only its own rotation is effective. This causes the pin to be very sharply steered inthe opposing direction. The movement of the pin is transfered directly to the rear axle. 12/10


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