Jul 2, 2009
Bruno Silva
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What are Torsion Bars?


Torsion bars are the springs that make up the suspension system of a vehicle. These are also called as torsion spring suspension or torsion beam suspension. The torsion bar spring has the property to revert back to its original shape and position when it is distorted by any kind of pressure. At its one end the torsion bar is fixed to the vehicle chassis and on its opposite end, the long torsion bar is fixed to the axle of the suspension arm. The torsion resistance of the bar neutralizes the vertical motions caused due to the movement of the wheels. The spring action is provided by the lengthwise twisting of the torsion bar due to the flexibility of the tube or steel bar. The diameter, length and the material of the torsion bar determine the spring rate.

Image17 1024x768 What are Torsion Bars?


The suspension system of torsion beam enables configuration of an easy riding height. The torsion beam is small as per the width of the vehicle and durable enough. The torsion suspension system consumes lesser space of the interior volume of the vehicle’s interior space and still provides longer travel durability. But it has its own trade offs as the car designers have to bargain between the riding and handling quality of the car as a torsion bar suspension cannot have an improving spring rate. Although, there are other torsion bars present in the market called progressive torsion bars but then these are not as durable as the torsion bar suspension because they develop cracks when the diameter of the bar is changed.

The first installation of torsion bars in the vehicles is reported to provide them with the characteristic of automatic leveling with the changing road conditions. To indemnify the traverse mounting style of the Volkswagen beetle, the company went in for the installation of tension bars in the cars. Most of the European cars around the World War II used the technology. These torsion bars are interconnected amongst them, both in rear and at front so that they enhance the riding experience.

The SUV’s as well as trucks of brands like General Motors, Dodge and Ford still use the torsion bars in their design to proportionate the heavier and lighter engine packages so that required adjustments could be made in the ride height.

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