Fluid pressure seal with pressure distortion barrier
US4747605A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 30, 1986 |
| Grant date | May 31, 1988 |
| Priority date | — |
| Expiry date | May 30, 2006 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16J15/3216
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A fluid pressure seal assembly is adapted to accomodate high and low pressure conditions in hydraulic oil environments. In a preferred form, the seal assembly includes a primary shaft sealing annulus having a radially inwardly extending circumferential sealing lip defined by a pair of outer and inner converging frustoconcial walls. During a low pressure mode, the sealing lip provides contact with the shaft being sealed. During a high pressure mode, the inner frustoconical wall provides a surface contact with the shaft. A rigid metallic support component is disposed for limiting axial movement of the annulus, the support component being a part of a steel J-casing which structurally supports a body of elastomer bonded thereto. In a preferred form the support component of the casing member is encased by a portion of the body of elastomeric material to form a barrier which limits the amount of high pressure deformation of the sealing annulus. Also, in a preferred form the sealing annulus is spaced from the barrier during low pressure sealing conditions, whereby a gap is defined between the primary sealing annulus and the barrier. During high pressure sealing, the gap is closed as the s…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.