Torsion Bar

Torsion Bar

The torsion bar performs the springs action by its resistance to twisting. The bar is made from steel. The bar is mounted transversally in some of the vehicles, whereas in other constructions, it is employed length wise along the frame. One end of the torsion bar is fixed to the frame and it cannot rotate. The opposite end is mounted and subjected to twisting moment. The mounting enables the bar to twist at the free end. A support arm on the twisting end is used to carry the wheel.

When the wheels move up and down the support arm swings and the twisting and untwisting of the bar takes place. the car weight places an initial twist on the bars, just as it places an initial compression of the coil spring of the car.

One end of each torsion bar is attached to the frame through a car levelling device. The car levelling device helps in adjusting the level of the car in case any sag occur in the suspension system after long mileage.

The torsion bar attached to the other components of an automobile is shown in fig. 6.12

References

1. Automobile Engineering (Vol. 1 & 2)            -           K.M.Guptha
2. Automotive Mechanics                                   -           Joseph Heitner
3. Automobile Engineering                                 -           Harbans Singh Reyd
4. Automotive Mechanics                                   -           William H. Course