Floating lip seal with reinforced flexible portion
US4844484A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 28, 1988 |
| Grant date | Jul 4, 1989 |
| Priority date | — |
| Expiry date | Jun 28, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S277/924
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An annular shaft seal including a continuous lip sealing element for sealing against oil flow between a bore and a shaft extending through the bore includes a convoluted elastomeric flexible section which connects the sealing element with a rigid case support. The flexible section is defined by a plurality of annuli, wherein each adjoining pair of annuli defines a reverse bend therebetween. One or more of the reverse bends is reinforced with a relatively non-elastic material, preferably plastic, which is integrally molded thereinto, and provides a torsional rigidity while permitting radial flexibility. This provides a closer following of the lip seal element on the shaft under conditions of extreme runout wherein the lip seal element would otherwise become dynamically distorted.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.