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The clock spring (also referred to as a flat torsion spring) is designed to produce a torsional force (circular movement). In contrast to the tightly coiled power spring, the clock spring has open coils that, when mounted correctly, reduces fricton to zero. However, torque capacity is reduced as a result. The standard range is made from rounded edge stainless steel, which affords a better fatigue life.
TC = Total Number of coils
R = Spring Rate, Nmm per degree of torque
Stainless steel EN 10270-3-1.4310
Tolerance for the position between inner and outer locating points is ±10 degrees for 5 coil springs and ±15 degrees for 8 coil springs.
1 kp = 9.80665 Newtons, 1 Newton = 0.10197 kp
The spring is best assembled on a grooved shaft. The end of the groove should be milled or rounded. To prevent the spring from getting an eccentric shape, leading to
friction during load, the outer end should be fixed as shown in one of the above examples. Otherwise, both torque force and spring life will be compromised.
For a static load (Nc < 10 000), the highest torque angle is recommended. If a higher Nc is required, please contact us for information about permitted torques.