SYSTEM, METHOD AND APPARATUS FOR SPRING-ENERGIZED DYNAMIC SEALING ASSEMBLY
First Claim
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1. A linear motion seal assembly for sealing between a housing defining a bore and a reciprocating rod disposed in the bore, the seal assembly comprising:
- a polymer ring;
an elastomer body joined to the polymer ring, the elastomer body comprising;
a base portion defining a first axial end of the elastomer body; and
a first arm portion extending from the base portion and defining a second axial end of the elastomer body,wherein the first arm portion is adapted to contact the rod along a scraper face, the scraper face terminating at the second axial end of the elastomer body, wherein the entire scraper face is concave with respect to the first arm portion, and wherein the entire scraper face is adapted to deform to a flat surface upon engagement with the rod; and
a spring joined to the elastomer body for radially biasing the arm portions of the elastomer body.
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Abstract
A seal assembly is disclosed. The seal comprises a metal spring bonded to an elastomer body that is coupled to a polymer ring. The spring may comprise a cantilevered, overlapped metal strip. The elastomer and polymer mechanically interlock with radial members. The elastomer has contacting surfaces configured in outward extending radii to enhance forward edge loading and oil removal from the dynamic surface. In hydraulic service, the seal prevents the egress of hydraulic fluid and ingress of foreign particles.
40 Citations
20 Claims
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1. A linear motion seal assembly for sealing between a housing defining a bore and a reciprocating rod disposed in the bore, the seal assembly comprising:
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a polymer ring; an elastomer body joined to the polymer ring, the elastomer body comprising; a base portion defining a first axial end of the elastomer body; and a first arm portion extending from the base portion and defining a second axial end of the elastomer body, wherein the first arm portion is adapted to contact the rod along a scraper face, the scraper face terminating at the second axial end of the elastomer body, wherein the entire scraper face is concave with respect to the first arm portion, and wherein the entire scraper face is adapted to deform to a flat surface upon engagement with the rod; and a spring joined to the elastomer body for radially biasing the arm portions of the elastomer body. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A linear motion seal assembly for sealing between a housing defining a bore and a reciprocating rod disposed in the bore, the seal assembly comprising:
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a polymer ring; an elastomer body joined to the polymer ring via engaging members, the elastomer body comprising; a base portion defining a first axial end of the elastomer body, a first arm portion extending from the base portion and defining a second axial end of the elastomer body, wherein the first arm portion is adapted to contact the rod along a scraper face, the scraper face terminating at the second axial end of the elastomer body, wherein the entire scraper face is concave with respect to the first arm portion, and wherein a minimum diameter of the scraper face is disposed along the second axial end of the elastomer body; and a spring joined to the elastomer body for radially biasing the arm portions of the elastomer body. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A linear motion seal assembly for sealing between a housing defining a bore and a reciprocating rod disposed in the bore, the seal assembly comprising:
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a polymer ring; an elastomer body joined to the polymer ring via engaging members, the elastomer body comprising; a base portion defining a first axial end of the elastomer body, a first arm portion, and a second arm portion, the first and second arm portions extending from the base portion and at least one of the first and second arm portions defining a second axial end of the elastomer body, wherein the first arm portion is adapted to contact the rod along a scraper face, wherein the entire scraper face is concave with respect to the first arm portion, wherein a minimum diameter of the scraper face is disposed along the second axial end of the elastomer body, wherein the second arm is adapted to contact the housing along a contact interface, and wherein, when viewed in cross section, the contact interface is adapted to deform to a flat surface upon engagement with the housing; and a spring joined to the elastomer body for radially biasing the arm portions of the elastomer body. - View Dependent Claims (19, 20)
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Specification