Shaft for use with annular seal assembly and method of manufacturing same
US6736404B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 4, 2000 |
| Grant date | May 18, 2004 |
| Priority date | — |
| Expiry date | Nov 4, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T82/10
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A structure and method of manufacturing an outer surface of a shaft avoids the creation of a preferential lead and thereby minimizes leakage through an annular seal assembly when such shaft is rotated or otherwise moved relative thereto during use. The outer circumferential surface of the shaft is formed having a plurality of relatively small irregularities that are evenly distributed thereabout. Such irregularities may be defined by relatively higher portions and relatively lower portions that are formed in an intersecting, cross hatched pattern or in a circumferentially extending undulating or oscillating pattern. To form the cross hatched pattern, an apparatus can be operated to engage the outer circumferential surface of the shaft in two sequential passes in opposite axial directions while the shaft is being rotated. To form the undulating pattern, an apparatus can be operated to engage the outer circumferential surface of the shaft in an axially reciprocating manner while the shaft is being rotated. By varying the feed rate of the apparatus, the rotational speed of the shaft, and the magnitude of the force applied by the apparatus against the outer circumferential surface of t…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.