From Colonial Seal Co.
Apart from the elastomeric lip material and interface between the sealing lip and application shaft, a critical design feature of the seal lip is its geometry. Lip geometry is one of several factors that directly affect the radial load exerted on the shaft. The others include the presence of a garter spring, shaft finish, pressure and installation. This article will focus on the lip design and geometry
Because the inner diameter of a seal is manufactured to be slightly smaller than the shaft diameter, the elastomeric lip will be stretched outward by the shaft during installation. When a garter spring is added to the seal these two forces contribute to increase the load on the shaft.
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