New approach to piston seal design for pneumatic components
14 January 2011
Freudenberg Simrit has succeeded in redefining the performance of pneumatic drives by separating the dynamic and static sealing functions. The Simrit T-ring piston seal optimises load-bearing capacities in terms of friction, wear, mounting reliability, sealing effect, and the bridging of tolerances. The single-piece, symmetrical piston seal will be presented for the first time at the 2011 Hanover Trade Fair.
T-ring has both a radial and an axial component (see the figure opposite). 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, creating ideal conditions for minimised 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 optimised 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 over-blow and sets new standards in terms of friction minimisation. In endurance tests, an NBR version of the Simrit T-ring showed only negligible wear.
The diagram shows decoupling of the dynamic (1) and static (2) sealing functions in T-ring.
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