Ptfe shaft seal and method of making
AssigneeFederal-Mogul Powertrain LLC
InventorsBRENT RYAN SEDLAR, EUGENE DAVID ZELINSKY, MARCIE NOTEBOOM
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Abstract
A method of manufacturing a PTFE rotary shaft seal assembly is provided. The assembly includes an annular seal case mountable within a bore of a housing and a wafer fabricated of PTFE. An outer region of the wafer is captured by the seal case and in inner region extends to a central opening of the wafer. The method includes coining the wafer to form coined fluid pumping impressions on a first side of the wafer and coined flexing impressions on an opposite second side of the wafer. The method also includes forming a coined static band portion encircling the central opening and being free of fluid pumping impressions.
Claims13
A method of making a PTFE shaft seal wafer, comprising:
- preparing an annular wafer preform of PTFE material that is of uniform thickness and that has an outer region and an inner region and opposite first and second sides;
- coining the wafer preform including pressing and permanently deforming the inner region between opposing coining dies to impress a plurality of coined dynamic fluid impressions into the first side, and to further coin a reduced-thickness static band portion that is free of fluid impressions and which encircles a central opening of the wafer to form a coined wafer.
Dependencies are inferred from the claim text.