Sealing assembly

Patent metadata

Field	Value
Publication number	US-9709173-B2
Application number	US-201414251075-A
Country	US
Kind code	B2
Filing date	Apr 11, 2014
Priority date	Apr 18, 2013
Publication date	Jul 18, 2017
Grant date	Jul 18, 2017

Abstract

A radial-shaft sealing assembly includes a sealing lip disposed on a support ring. A cylindrical portion of the sealing lip that abuts on a rotatable shaft contains an elastomeric material and has a profiling for pumping oil or lubricant back to an oil side of the sealing assembly. The profiling includes first and second annular ridges disposed in parallel, and first and second groups of radially-projecting pumping elements disposed therebetween and distributed around the circumference of the cylindrical portion. Each pumping element extending at an angle (α) to the circumferential direction (U) of the cylindrical portion, but the first group of pumping elements has an opposite orientation to the second group of pumping elements.

First claim

I claim:

1. A radial-shaft sealing assembly, comprising:
a support ring, and at least one sealing lip disposed on the support ring and having a cylindrically formed surface section configured to abut on a shaft in order to seal the shaft in an axial direction thereof between an air side and an oil side, wherein the at least one sealing lip is comprised of an elastomeric material, and a profiling for pumping of oil during rotation of the shaft is disposed or defined in or on the cylindrically formed surface section, the profiling comprising: a first radially inwardly projecting annular rib configured to abut on the shaft, wherein the first annular rib is disposed adjacent to the air side in a first edge region of the cylindrically formed surface section, a second radially inwardly projecting annular rib configured to abut on the shaft, wherein the second annular rib is disposed adjacent to the oil side in a second edge region of the cylindrically formed surface section, a plurality of first radially-projecting pumping elements disposed in an axial region between the first and second annular ridges ribs and distributed around a circumference of the cylindrically formed surface section, each of the first radially-projecting pumping elements extending at an angle (α) to a circumferential direction (U) of the cylindrically formed surface section, and a plurality of second radially-projecting pumping elements disposed in an axial region between the first and second annular ridges ribs and distributed around a circumference of the cylindrically formed surface section, each of the second radially-projecting pumping elements extending at the angle (α) to the circumferential direction (U) of the cylindrically formed surface section, but with an opposite orientation to the circumferential direction (U), wherein the first radially-projecting pumping elements are circumferentially spaced from the second radially-projecting pumping elements.

2. The radial-shaft sealing assembly according to claim 1 , wherein the first radially-projecting pumping elements alternate with the second radially-projecting pumping elements in the circumferential direction (U).

3. The radial-shaft sealing assembly according to claim 1 , wherein the angle (α) of the pumping elements relative to the circumferential direction (U) is 5°≦α≦30°.

4. The radial-shaft sealing assembly according to claim 1 , wherein the pumping elements do not contact the first annular rib in the first edge region adjacent to the air side.

5. The radial-shaft sealing assembly according to claim 1 , wherein the first annular rib and/or the second annular rib has (have) a contour in the radial section and the contour includes: a first flank facing towards the air side at a first angle (β) to a rotational axis (X) of the shaft and a second flank facing towards the oil side at a second angle (γ) to the rotational axis (X) of the shaft, wherein the first flank angle (β) is smaller than the second flank angle (γ).

6. The radial-shaft sealing assembly according to claim 5 , wherein the first flank angle (β) is 10°≦β≦20° and the second flank angle (γ) is 40°≦γ≦60°.

7. The radial-shaft sealing assembly according to claim 1 , wherein the first and second pumping elements each have a contour in a section perpendicular to a longitudinal axis of the pumping elements and the contour includes first and second flanks respectively having first and second flank angles (δ, ε), wherein the first and second flank angles (δ, ε) are different.

8. The radial-shaft sealing assembly according to claim 1 , further comprising: a fluid guide element disposed between each set of first pumping element and second pumping element that, as viewed in the axial direction, extend towards each other in the vicinity of the first edge region adjacent to the air side.

9. The radial-shaft sealing assembly according to claim 8 , wherein the fluid guide element, as viewed in the radial direction, has a triangular shape, wherein one side of the triangle borders on, or is connected to, the first annular rib and extends collinearly or parallel thereto.

10. The radial-shaft sealing assembly according to claim 9 , wherein the triangle is defined by a radially inwardly projecting elevation in the cylindrically formed surface section ( 4 ).

11. The radial-shaft sealing assembly according to claim 8 , wherein the fluid guide element is defined by radially inwardly projecting ridge sections in the cylindrically formed surface section of the at least one sealing lip.

12. The radial-shaft sealing assembly according to claim 1 , further comprising: a plurality of reinforcing ridges disposed on a radially-outer surface of the cylindrically formed surface section of the at least one sealing lip, each reinforcing ridge extending parallel to a rotational axis of the shaft.

13. The radial-shaft sealing assembly according to claim 1 , wherein: the first radially-projecting pumping elements alternate with the second radially-projecting pumping elements in the circumferential direction (U), the angle (α) of the pumping elements relative to the circumferential direction (U) is 5°≦α≦30°, and none of the pumping elements contact the first annular rib, such that a gap exists in the axial direction between a terminal end of each pumping element and the first annular rib.

14. The radial-shaft sealing assembly according to claim 13 , wherein the first annular rib and/or the second annular rib has (have) a contour in the radial section and the contour includes: a first flank facing towards the air side at a first angle (β) to a rotational axis (X) of the shaft and a second flank facing towards the oil side at a second angle (γ) to the rotational axis (X) of the shaft, wherein the first flank angle (β) is 10°≦β≦20° and the second flank angle (γ) is 40°≦γ≦60°.

15. The radial-shaft sealing assembly according to claim 14 , wherein the first and second pumping elements each have a contour in a section perpendicular to a longitudinal axis of the pumping elements and the contour includes first and second flanks respectively having first and second flank angles (δ, ε), wherein the first and second flank angles (δ, ε) are different.

16. The radial-shaft sealing assembly claim 15 , further comprising: a fluid guide element disposed between each set of first pumping element and second pumping element that, as viewed in the axial direction, extend towards each other in the vicinity of the first edge region adjacent to the air side.

17. The radial-shaft sealing assembly according to claim 16 , wherein the fluid guide element, as viewed in the radial direction, has a triangular shape, wherein one side of the triangle borders on, or is connected to, the first annular rib and extends collinearly or parallel thereto.

18. The radial-shaft sealing assembly according to claim 17 , further comprising: a plurality of reinforcing ridges disposed on a radially-outer surface of the cylindrically formed surface section of the at least one sealing lip, each reinforcing ridge extending parallel to the rotational axis of the shaft.

19. A radial shaft seal, comprising: a support ring, at least one sealing lip disposed on the support ring and having a cylindrical surface section configured to abut on a rotatable shaft in order to seal the shaft between an air side of the sealing assembly and an oil side of the sealing assembly, wherein the sealing lip at least substantially comprises elastomeric material, a profiling configured to pump oil or lubricant when the shaft rotates is disposed or defined in or on the cylindrical surfa

Assignees

• Kurth Juergen
• Skf Ab

Inventors

• Kurth Juergen

Classifications

• F16J15/3244 Primary

  with hydrodynamic pumping action · CPC title