steering gear boxes

1.Worm and Wheel Type:
 This type of steering gear has a square cut screw

threads at the end of the steering column; which forms a worm, at the end of

it a worm wheel is fitted and works rigidly with it. Generally covered shaft is

used for the worm wheel. The worm wheel can be turned to a new position

the drop arm can be readjusted to the correct working position.

2. Re-circulating Ball Type:

In this type of gear box the endless chain of balls

are provided between the worm and nut members. The nut form a ring of

rack having an axial movement. So that the sector on the rocker shaft racks,

the balls roll continuously between the worm and nut. Being provided with

return chambers at the ends of the worm. This method reduces friction

between worm and nut members. This type of steering gear is used for heavy

vehicles.

3. Rack and Pinion Type: This is common manual type of steering gear box

is used in most of the vehicles. In this type of steering a pinion is provided the

bottom end of the steering column. The teeth of the pinion wheel in mesh

with corresponding teeth provided on the rack, the end of which areconnected to the stub axle through the rod. The rotating motion of the pinion operates the rack  direction which in turn operates the stub axle.

4. Cam and Lever Type: The cam and lever steering uses one or two lever

studs fitted in taper roller bearing. When the worm in the form of helical

groove rotates the stub axle and it also rotates along with it. This imports a

turning motion to the drop arm shaft.

5. Worm and Sector Type: In this type the worm on the end of the steering

shaft meshes with a sector mounted on a sector shaft. When the worm is

rotated by rotation of the steering wheel, the sector also turn rotating the

sector shaft. Its motion is transmitted to the wheel through the linkage. The

sector shaft is attached to the drop arm or pitmen arm.

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