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Torsion Springs
Torsion springs are different to
both compression and extension springs in that they do not work on linear forces but exert a torque, or rotary, force.
They work by providing resistance to the twist or rotational forces.
They absorb and release angular energy or hold an object in place under tension.
Size Range |
Steels Available |
Coatings and Finishes |
0.3mm to 16mm
Various flat strip sizes
on hand. |
Carbon, Stainless, Phospher Bronze. |
Paint
Electro plating, ie Zinc
Powder Coating |
This type of spring usually has close wound coils but can sometimes have a pitch (space between coils) to reduce friction between the coils.
Torsion springs can work in a clockwise or counter-clockwise rotation, depending on the direction of the wind.
Torsion springs are used in applications where a pivot is involved. Some common uses for torsion springs are clothespins, clipboards and garage doors; hinges, counterbalances and lever return applications (i.e. brake lever), and some bicycles brakes.
Torsion springs can be manufactured from wire ranging from 0.3mm to 16mm.
The smallest torsion springs can be used in electronic devices and medical equipment, the largest in armchair levers and industrial applications.
For a torsion spring to provide resistance, the ends need to be secured to a component Different leg ends are available to suit any application.
Styles of leg ends include straight torsion, straight offset, hinged, double torsion, and hook ends.
One form of torsion spring is the double torsion spring. These consist of two sets of coils; one coiled clockwise and the other coiled counter-clockwise.
These coils are connected and work in parallel. A common example of a double torsion spring is a mousetrap.
As a torsion spring is loaded under stress, the body of the spring will reduce in diameter the length will increase. This is important to consider when space is limited.
For torsion springs to perform best they should be supported by a rod or tube. Without a rod or tube to keep the spring body stationary, it can deflect when under a load. This is another point to consider when space is limited.
Performance factors: Spring Rate, Maximum Deflection, Maximum Load and Wind Specifications.
- Spring Rate is the angular return torque provided per unit of angular displacement.
- Maximum Deflection is the maximum rated angular deflection of spring before damage.
- The Wind of the torsion spring can be right hand, left hand, or double torsion.
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