Abstract: A radial shaft seal has a polymer sealing ring, a holding section having a polymer-bonded reinforcement insert, and a sealing lip extending away from the holding section in an axial direction of the sealing ring. The sealing lip has a first end connected to the holding section and a free second end provided with a sealing edge on a radial inside and a groove on a radial outside of the sealing lip. A radially deformable deformation zone of the sealing lip is between the first end and the sealing edge. The radial shaft seal has a spring in the groove energizing the sealing lip. The sealing ring has a protrusion axially extending from the holding section towards the spring forming an axial stop for the spring and, thus, for the second end of the sealing lip when the deformation zone of the sealing lip is deformed radially inwards.

Abstract: A radial shaft seal has a polymer sealing ring, a holding section having a polymer-bonded reinforcement insert, and a sealing lip extending away from the holding section in an axial direction of the sealing ring. The sealing lip has a first end connected to the holding section and a free second end provided with a sealing edge on a radial inside and a groove on a radial outside of the sealing lip. A radially deformable deformation zone of the sealing lip is between the first end and the sealing edge. The radial shaft seal has a spring in the groove energizing the sealing lip. The sealing ring has a protrusion axially extending from the holding section towards the spring forming an axial stop for the spring and, thus, for the second end of the sealing lip when the deformation zone of the sealing lip is deformed radially inwards.

Abstract: A radial shaft seal has a polymer sealing ring, a holding section having a polymer-bonded reinforcement insert, and a sealing lip extending away from the holding section in an axial direction of the sealing ring. The sealing lip has a first end connected to the holding section and a free second end provided with a sealing edge on a radial inside and a groove on a radial outside of the sealing lip. A radially deformable deformation zone of the sealing lip is between the first end and the sealing edge. The radial shaft seal has a spring in the groove energizing the sealing lip. The sealing ring has a protrusion axially extending from the holding section towards the spring forming an axial stop for the spring and, thus, for the second end of the sealing lip when the deformation zone of the sealing lip is deformed radially inwards.

Abstract: A back pumping seal assembly includes a buffer seal and a backup ring. The buffer seal has inner, outer, front, and back seal faces. The buffer seal further has a contoured face portion inset and extending inwardly from the inner and back seal faces. The contoured face defines a back seal channel. The backup ring is positioned in the back seal channel of the buffer seal. The backup ring includes inner and back ring faces, and at least two channel-directed faces. The inner and back ring faces are adjacent the inner and back seal faces, respectively. A first channel-directed face extends from the inner ring face substantially parallel to the back ring face. The first channel-directed face is configured for limiting displacement of an adjacent portion of the buffer seal. A second channel-directed face extends from the back ring face at an acute angle relative thereto.

Abstract: A backup ring is provided adjacent a seal apparatus for delivering a controlled space between two relatively moving parts. The backup ring provides protection against seal extrusion and failure, and can provide an auxiliary seal when needed. The backup ring includes either an arcuate surface that deforms under pressure, or a cantilever portion that deforms under pressure, or both.

Abstract: A sealing device for sealing the gap between two relatively moving members is provided with a pivot point on its cross-sectional perimeter. As pressure against the seal increases, the seal rotates about the pivot point, resulting in an increased sealing surface area on the seal. Additionally, a recess is provided on the cross sectional perimeter, advantageously offering a more frictionless sealing relationship between the seal and the moving member. Further, a recess is provided on outer portion of the cross sectional perimeter on a surface of the seal that would contact an energizer ring, the recess eliminating a dynamic interface between the energizer ring and the seal.

Abstract: A sealing device for sealing the gap between two relatively moving members is provided with a pivot point on its cross-sectional perimeter. As pressure against the seal increases, the seal rotates about the pivot point, resulting in an increased sealing surface area on the seal. Additionally, a recess is provided on the cross sectional perimeter, advantageously offering a more frictionless sealing relationship between the seal and the moving member. Further, a recess is provided on outer portion of the cross sectional perimeter on a surface of the seal that would contact an energizer ring, the recess eliminating a dynamic interface between the energizer ring and the seal.

Abstract: A sealing device for sealing the gap between two relatively moving members is provided with a pivot point on its cross-sectional perimeter. As pressure against the seal increases, the seal rotates about the pivot point, resulting in an increased sealing surface area on the seal. Additionally, a recess is provided on the cross sectional perimeter, advantageously offering a more frictionless sealing relationship between the seal and the moving member. Further, a recess is provided on outer portion of the cross sectional perimeter on a surface of the seal that would contact an energizer ring, the recess eliminating a dynamic interface between the energizer ring and the seal.