Worm And Sector Steering Gear

The Steering System:
Worm And Sector Steering Gear

This type of steering gear looks a lot like our bolt and nut, but the sector of this type looks like a gear instead of a nut. The teeth of the sector are machined in an arc, or curve, so that they actually look like a section of a gear.

As the steering wheel and worm turn, the worm pivots the sector and pitman arm shaft. The sector pivots through an arc of 70° because it is stopped at each extreme when it touches the steering gear housing.

The worm is assembled between bearings, and some means is provided to adjust the bearings to control worm end play.

The pitman arm shaft is fitted into the steering gear housing on bearings (generally the bushing type, but roller-type bearings are sometimes used). A lash adjustment screw is also provided so that the sector can be moved closer to, or farther away from, the worm gear to control the backlash between the sector and worm threads or teeth.

The worm and sector steering gear is very simple in construction. This makes it cheap to build and easy to maintain. A disadvantage is that it has a lot of friction because of the sliding action between the worm and sector gear teeth.

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Article Pages
1. Steering System
2. Steering Principles And Construction
3. Fifth Wheel Steering
4. Ackerman Steering
5. Steering Linkage
6. Steering Gear
7. Worm And Sector Steering Gear
8. Worm And Roller Steering Gear
9. Cam And Lever Steering Gear
10. Air Bags
11. Worm And Ball Nut Steering Gear
12. Rack And Pinion Type
13. Four Wheel Driving And Steering
14. The Principles Of Wheel Alignment
15. Caster
16. Camber
17. Kingpin Inclination
18. Toe-In
19. Toe-Out
20. Common Steering Problems
21. Steering Gear Inspection
22. General Inspection Procedures
23. Construction And Operation Of Power Steering Systems
24. Typical Power Steering Pump
25. Reservoir
26. Control Valve
27. Power Steering Gearbox
28. Hydraulic Cylinder
29. Power Steering Operation
30. Power Steering Configurations
31. Troubleshooting The Power Steering System
32. Inspecting The Power Steering System
33. Isolating Power Steering Faults

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