Automobile Engineering

The steering gear can be classified as under:-

· Worm and wheel.

· Worm and sector.

· Worm and roller.

· Screw and roller.

· Screw and nut.

· Cam and lever.

· Rack and pinion.

Worm and wheel: In this type of steering gear worm employed on the steering shaft drivers the toothed wheel. The toothed wheel is attached to the shaft which drivers the pitman arm.

v Worm and sector: In this type of steering gear, a toothed sector replaces the completed wheel.

v Worm and roller: here a roller is fitted at the drop arm shaft. When the worm moves along with the movement of steering wheel, the roller rides up and down in the worm giving a twist to the drop arm shaft which in turn moves the drop arm.

v Srew and nut: In this case, a screw replaces the worm on the steering shaft and a nut replaces the sector or wheel on the drop arm shaft. When the steering wheel is rotated, the nut rides up and down on the screw giving the required twist to the drop arm shaft.

v Cam and lever: In this type of steering gear, a helical grove around the steering shaft lower end, in lieu of worm or screw acts as a cam. The drop arm shaft contains one or two pegs which act as levers. As the steering shaft moves, the pegs at the drop arm shaft ride up and down the helical grove causing movement to the drop arm shaft.