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What are Torsion Springs?
They work by storing mechanical energy when the end of the coil is rotated around the spring axis, allowing the cylindrical wound torsion springs to exert a rotational force. Typically, the inside body diameter is mounted on a shaft, with some play between the inner diameter and the shaft for single torsion springs.
Torque is equal to force multiplied by leg length (MT=F x LL), and interestingly, torsion springs have a linear characteristic. This means that if a spring is deflected by 10°, for example, which provides a torque of 1Nmm, 2Nmm would be exhibited at an angle of 20° spring deflection.
Best Practices When Using Torsion Springs from Metrol
We recommend that the load is applied to the torsion springs, so the torque application binds the spring. This is because the spring is strongest in this direction. Furthermore, fixed tension ends are always recommended as these can minimise friction against the shaft. It is also worth bearing in mind that the closer the load is to the end of the torsion spring leg length, the less counterforce created due to the increased momentum from the longer axis attachment point. If you use the maximum specified torque angle in your application, 10,000 load cycles are the maximum permitted. At 80% of the permitted torque angle, the lifespan increases to 200,000-400,000 load oscillations, and at 70%, the lifespan is almost infinite.
We Offer a Wide Range of Torsion Springs
View each category in our wire springs interface to view single and double-ended springs. You can select your desired wire diameter, internal diameter and leg position (TC=‘number of sprung coils’ and R=‘Spring Rate, Nmm per degree’). Our standard springs have straight ends and are manufactured from stainless steel.
We can also design and create made to order custom torsion springs. Choose from a double or single coil, then let us know your required technical information, and one of our friendly team will be in touch to discuss and refine your requirements.
Order Today for Next Day Delivery
If the torsion spring you require is in stock, you can expect Next Day or Express Delivery from our DPD courier. We have provided detailed information about UK domestic shipping and international delivery, so you can be confident you will receive your order when you need it.