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Precision clutches eliminate stiction

04 July 2007

Polyclutch from Huco Dynatork has a static friction that is lower than its dynamic friction. This brings important performance benefits. When employed in mechanisms handling paper, film, wire or thread, for example, Polyclutch maintains constant tension with no sudden shocks that might otherwise damage the product. Similarly, the new clutch ensures smooth and accurate starting and stopping of indexing systems and linear actuators. It is particularly ideal for slip at the end of stroke.

For protection during overload, Polyclutch provides repeatable cushioned torque, the accuracy of which also makes the component an ideal choice for torque control on capping machines, automatic screw driving and valve control. It additionally works well as part of a friction hinge mechanism where smooth movement of lids, doors, screens and covers is required. Constant torque is assured by a series of interleaved friction discs with soft springs that maintain pressure on the friction members.

Polyclutch complements Huco Dynatork’s established Vari-Tork torque limiters with the new range meeting the need for higher torques. A wide choice of types, torques and configurations is available to suit a broad variety of applications. The complete range comprises continuous slip mechanical clutches, pneumatic slip clutches and one-way clutches. All of the mechanical slip clutches provide a long operating life, which is typically in excess of 30 million cycles.

Noteworthy options in the range include the Polyclutch Slip-Ease mechanical slip clutch that uses an axial loaded multi-plate design for applications where space is at a premium and low backlash is required. Polyclutch Slip-Aire is an air-actuated version of the mechanical Polyclutch slip clutch. It is suitable for servo mechanisms and is able to transmit higher torque levels than comparably sized mechanical slip clutches.

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