Innovative Piston Seal Allows for Leap in Performance

By adopting a completely new design approach, Freudenberg Simrit has succeeded in redefining the performance of pneumatic drives. By separating the dynamic and static sealing functions, the Simrit T-ring as a piston seal, for which a patent application has been submitted, optimises load-bearing capacities in terms of friction, wear, mounting reliability, sealing effect, and the bridging of tolerances.

The single-piece, symmetrical piston seal, which will be presented for the first time at the 2011 Hanover Trade Fair, has both a radial and an axial component (see Fig.). The dynamic sealing function is assumed by a sealing area with a large radius. The radial force required for this is built up by the geometric interference alone. This eliminates the radial compression of the seal cross section, thereby creating ideal preconditions for the minimisation of friction and wear and the elimination of stick-slip effects.

Thanks to the much thinner area of the T-ring, a kind of diaphragm, the static sealing function is built up simultaneously and separately and is optimized according to function. The static sealing force is generated by the pressure from the concentric sealing edges on the front face of the groove alone.

This sealing innovation for pneumatic drives has no overblow and sets new standards in terms of friction minimisation. In endurance tests, an NBR version of the Simrit T-ring showed only negligible wear.
Illustration

By decoupling the dynamic (1) and static (2) sealing functions in its new T-ring, Simrit has succeeded in significantly increasing the performance of pneumatic drives.

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