Shaft sealing system
OwnerAndrew W. Sumaninventor
Life of this patent
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Abstract
A radial shaft seal includes a powder coating on a shaft and a sealing lip that lands on the powder coating. The powder coating is formed of a thermosetting resin and a filler material. The filler material has a melting point above the cure temperature of the thermosetting resin. The powder coating may be porous. The powder coating may be made up of dry powder particles adhered to one-another with spaces in between. The filler may be present in an amount between 15% and 35% within the individual particles. The powder coating is adapted to wear away at locations of maximum interference with the sealing lip while continuing to provide a durable seal. This wear behavior compensates for shaft wobble.
Claims12
A radial shaft seal, comprising:
- a powder coating over an outer surface of a shaft;
- and
- a sealing lip abutting the powder coating and forming a radial shaft seal;
- wherein the powder coating is of the type formed by powder coating with particles individually comprising a thermosetting resin and a filler material that is a solid lubricant having a melting point above a cure temperature of the thermosetting resin;
- the powder coating comprises a first layer proximate the shaft and a second layer more distal from the shaft;
- and
- the first layer is more wear resistant that the second layer.
A radial shaft seal repair sleeve, comprising:
- a radial shaft seal repair sleeve having a cylindrical outer surface;
- and
- a powder coating on the cylindrical outer surface;
- wherein the powder coating is formed of particles comprising a thermosetting resin and a filler material having a melting point above a cure temperature of the thermosetting resin;
- and
- the powder coating has a structure formed by curing the particles in such a way that the particles sinter but do not flow sufficiently to entirely lose their discrete identities;
- and
- the radial shaft seal repair sleeve is free from any shaft or is installed on a shaft that is worn beneath the radial shaft seal repair sleeve;
- wherein the powder coating comprises a first layer proximate the cylindrical outer surface and a second layer more distal from the cylindrical outer surface, and the first layer is more wear resistant that the second layer.
Dependencies are inferred from the claim text.