Composite ring made of press fitted parts and method of assembling
AssigneeCrane Packing Limited
InventorEugene W. Novosad
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Abstract
The invention disclosed is a composite ring made of press-fitted parts and method of assembling concentric articles having an interference fit, the inner one of which has a surface of a granular material such as ceramic, the method eliminating the customary heat shrinking step by which the outer one, usually of metal, is heated and expanded over the inner one and then cooled to shrink it tightly over the inner one. According to the method disclosed, the ceramic surface is coated with a polyetetrafluoroethylene lubricant and then pressed into the outer one without the use of heat. A mating ring for rotary mechanical end face seals, wherein the mating ring is formed of a ceramic ring pressed into a metal supporting stamping, is also disclosed.
Claims8
As an article of manufacture a composite ring comprising an inner ring and an outer ring, said inner and outer rings each having a cylindrical surface in contact with a cylindrical surface of the other ring to form an interface, the surface of the inner ring being comprises of a brittle granular material, and a lyaer of polytetrafluoroethylene particles interposed between said inner and outer rings at the interface, the rings having an interference fit at the said interface and said polytetrafluoroethylene particles lubricating the interface during the assembly of the inner and outer rings and providing a fluid-tight seal at said interface.
Dependencies are inferred from the claim text.