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One of the common mechanism used for steering wheel in automotive is the worm and wheel steering gear. In this mechanism movement of the steering wheel turns the worm, which in turn drives and worm wheel. Attached to the wheel spindle rigidly is drop arm, so that a rotation of the steering wheel corresponds to a linear motion of the drop arm end, which is connected to the link rod.Worm and wheel steering gear mechanism is as shown below in the figure.

worm and wheel steering gear

The backlash due to wearing out of the teeth of the worm and worm wheel can be easily adjusted. For this purpose the worm wheel is mounted over an eccentric bush. When the teeth have worn out, the problem is how to bring the worm and the wheel together to take up the wear. This is done by rotating the bush through a certain angle.

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