Steering Gear Types.—Three types of steering gears are commonly used by automobile manufacturers. They are namely, the worm and sector, worm and nut, and rack and pinion types.
[Fig. 135] shows the construction and operation of the worm and sector type. The lower end of the steering shaft carries a worm gear which meshes with the sector gear supported by a separate shaft. The sector has a ball arm extending downward, which moves in a forward and backward direction when the steering shaft is turned.
Steering Wheel
St. Column Worm
Sector
Spark
Throttle
Frame
Fig. 135. Worm and Sector Steering Gear