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Torsion springs

Our machines produce fully automatic (double-wound) torsion springs from 0.4 mm.

Torsion springs include two types:

  1. Single wound torsion springs
  2. Double-wound torsion springs.

Torsion springs that are double-wound feature a “Bridge” that roughly connects two single-wound torsion springs together.

Torsion springs can be further focused on ends.

Double-wound torsion springs have the following parameters:

Parameter Meaning
d Wire thickness
Di Inner diameter
Nw Active windings
a Gear length
b Length of frame
c Width of the frame
Lo Length in unstrained conditionww
Mn Maximum allowable twist in Moment Newton
C Nmm/° Spring constant
Angular rotation at Mn

Torsion springs have the following parameters:

Parameter Meaning
d Wire thickness
Dm Diameter center to center (Di+d)
Di Inner diameter
Du External diameter
N Number of windings
Lo Unstrained length
Max. Angular rotation (degrees) at Mn Nmm
Mn Nmm Maximum number of newtons at a°
M Moment
R Length to point of engagement
F Force in Newtons
A Gear length

The Lo is equal to N+1 x d

The Dm is equal to ( Di + Du ) / 2

The moment is equal to R x F

As an example, the TS103020L. The spring constant is 95.86 C (N mm/0. The maximum rotation is 70 degrees. This makes the maximum Newton count 6,710.2 moment. (70 * 95.86). This torsion spring has a poke of 90 mm. At the maximum torque, with this lever, the maximum Newton sitting on the end of the lever is 74.55 Newton is (6,710 / 90). So on the poker a pressure of 7.6 kilograms.

Read more about poking at torsion springs.

The poke of a torsion spring is a lever. Thus, the poker provides a lever effect. The lever effect actually says; the longer the lever, the less force it takes to rotate the torsion spring. The lever effect has application to the force placed on the torsion spring.

Read the detailed explanation of the lever effect on torsion springs.

A shorter poker on the torsion spring:

If you shorten the lever on a torsion spring, it will cause the spring rate to have to be lowered. A shorter poke requires more force to bend the spring.

As an example, making the lever 40 mm shorter, with this spring rounded, 31 degrees less force is required.

A longer poker on the torsion spring:

If you lengthen the lever on a torsion spring, it causes the spring rate to have to be increased. A longer poker ensures that less force is required to bend the spring.

An example: making the lever on a spring longer by 30 mm causes the spring constant to have to be increased by 31.94 C (N mm/’).

Read more about poking at torsion springs in our blog post.

There are different types of torsion springs, the most common distinction is made between double-wound torsion springs and single-wound torsion springs. Furthermore, torsion springs have different ends depending on the application. The ends are applicable to single and double wound torsion springs.

  1. Torsion springs with curved ends
  2. Torsion springs with twisted ends
  3. Torsion springs with hooks
  4. Customized ends on torsion springs.
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