Seals for hydraulic assemblies
OwnerJohn Wentworth Bucknellinventor
Life of this patent
Estimating the term…
Abstract
A seal for hydraulic assemblies operating at high temperatures having adaptations (19, 20, 49, 50) for low pressures sealing and configured to move across the gap to be sealed at higher pressures with an angled base on a slope (23, 44) or a cup shape (73, 74) nested into a groove (72). The seal at the point of the gap being an elastic, metallic material.
Claims13
A seal for an hydraulic assembly for operation in a high temperature and/or pressure environment, wherein hydraulic fluid is to be contained under pressure in a working chamber formed between at least two parts of the assembly, against flow into a gap between said two parts, wherein said gap is defined between a first surface on one of said two parts and a second substantially parallel surface on a second of said two parts, said second part having a sloping surface extending away from said second surface to a third surface substantially parallel to the first and second surfaces, characterized in that:
- the seal has a primary sealing mode wherein seal components are adapted to be in contact with said two parts of the assembly, operative to contain hydraulic fluid to a first pressure level;
- and
- a secondary sealing mode, established by elastic deformation of the seal at a pressure beyond said first pressure level, wherein the seal is adapted to closely associate with the gap, a portion of the seal being constructed of metal, and that portion being adapted to closely associate with the gap;
- wherein
- said seal comprises a seal body having outwardly projecting sealing flanges thereon that are adapted to contact respective first and third surfaces to effect a seal therewith in said primary scaling mode;
- and
- said seal body is adapted to elastically deform to slide along said sloping surface toward said first surface to effect the secondary sealing mode.
A seal as claimed in claim in 1, wherein:
- a shell is superimposed on said seal body and extends divergently upwardly and outwardly from the body to form said scaling flanges.
An hydraulic assembly with a working chamber between a least two parts of the assembly, wherein the working chamber is sealed by at least one seal, said seal having a primary sealing mode, established by contact of seal components with said parts of the assembly, operative to contain hydraulic fluid to a first pressure level, and a secondary sealing mode, established by elastic deformation of the seal at a pressure beyond said first pressure level, to closely associate the seal with a gap, a portion of the seal being constructed of metal, and that portion being closely associated with the gap wherein:
- said gap is defined between a first surface on one of said two parts and a second substantially parallel surface on the second of said two parts, said second part having a sloping surface extending away from said second surface to a third surface substantially parallel to the first and second surfaces,
- said seal comprises a seal body having outwardly projecting sealing flanges thereon that contact respective first and third surface to effect a seal therewith in said primary scaling mode, and
- said seal body is adapted to elastically deform to slide along said sloping surface toward said first surface to effect the secondary sealing mode.
Dependencies are inferred from the claim text.