Contorque
Constant Torque Springs

Constructed from a specially stressed constant force spring, Contorque springs provide high amounts of torque in a small package. Contorque springs can be designed to produce positive or negative gradient output torque.

Because there are a number of different spring design possibilities for a given application it is suggested that you consult with a Vulcan engineer early in the design phase. The tables in this section are only a guide; they do not list stock springs.

After you work through the product specifier below, submit your information and the specifier will create a specification sheet for submission to Vulcan.

The following parameters affect the constant torque spring design:
Material - Typically Type 301 stainless steel, but high-carbon steel and other materials are available.

Life - An estimate which is too low leads to early failure, an estimate which is too high makes the spring larger and more expensive than necessary.

Torque - should equal the torque required to drive the mechanism plus the governor in the application, normal tolerance is +/- 10%.

Calculate the Minimum Spool Spacing - The distance between spool centers (dimension "S") must be greater than the radius of the spring when fully wound on the storage spool, plus the radius of the spring when fully wound on the outpost spool. Note: The following guides are a nominal design. The output spool may be altered to accommodate specific requirements. A Vulcan engineer should be consulted if alterations are required.

Available Space - for proper operation, leave +10% calculated according to material thickness, life, and torque required.

Length - allow at least 1 and 1/2 turns to remain on the storage spool an 1 and 1/2 turns to remain on the output spool.

End Detail - select END DETAIL to view a selection of VULCAN's many standard end detail designs. Custom designs are available.