Sealing element for a ball-and-socket joint

Patent metadata

Field	Value
Publication number	US-11268567-B2
Application number	US-201816216099-A
Country	US
Kind code	B2
Filing date	Dec 11, 2018
Priority date	Dec 11, 2018
Publication date	Mar 8, 2022
Grant date	Mar 8, 2022

Abstract

A sealing element for a ball joint has a sealing area on the housing side and a sealing area a distance away therefrom in an axial direction of the sealing element on the stud side. Arranged between the housing-side sealing area and the stud-side sealing area is an outlet opening which extends through the sealing element to allow the passage of spent lubricant. The outlet opening extends in the axial direction of the sealing element, passing all the way through the sealing element in the axial direction. Further, the sealing element is incorporated in a ball joint which is incorporated in a two-point control arm.

First claim

The invention claimed is:

1. A sealing element for a ball joint, the sealing element comprising:
a sealing area on a housing side and a sealing area on a stud side a distance away therefrom in an axial direction of the sealing element, and an outlet opening is arranged between the sealing area on the housing side and the sealing area on the stud side and extends through the sealing element to allow passage of spent lubricant, the outlet opening extends in the axial direction of the sealing element, passing completely through the sealing element in the axial direction thereof, an axial end of the sealing element, on the stud side, has an annular inner groove which receives an annular dish-shaped plate, and the annular dish-shaped plate has an all-round bead on an inside circumference thereof which at least partially blocks the outlet opening.

2. The sealing element according to claim 1 , wherein the outlet opening in the axial direction of the sealing element extends substantially from the sealing area on the housing side to the sealing area on the stud side and the outlet opening forms an aperture on the stud side that is at least partially blocked by the annular dish-shaped plate.

3. The sealing element according to claim 1 , wherein the outlet opening is in a shape of either a truncated cone or frustum.

4. The sealing element according to claim 1 , wherein the sealing element has at the axial end on the stud side, a stud-side geometrical area undercut relative to the axial direction of the sealing element, to enable interlocking connection of the annular dish-shaped plate to the sealing element.

5. The sealing element according to claim 4 , wherein to enable the interlocking connection of the annular dish-shaped plate, the geometrical area undercut comprises the inner groove which is radially opposite from the sealing area on the stud side and, adjacent to the geometrical area in the axial direction, and a bead faces toward the sealing area on the stud side.

6. The sealing element according to claim 1 , wherein the sealing element is solidly formed so that, in a fitted condition, the sealing element will restrict deflection movements of a ball stud of the ball joint relative to a housing of the ball joint.

7. The sealing element according to claim 1 , wherein the outlet opening has an aperture at an end face at the axial end of the sealing element on the stud side that opens in a trench-like annular groove ( 11 ) of the sealing element formed in the end face on the stud side.

8. The sealing element according to claim 7 , wherein in the end face on the stud side the sealing element has at least one radial lubricant groove formed to enable spent lubricant to drain away, the radial lubricant groove extending from the annular groove straight in a radial direction perpendicular to the axial direction of the sealing element.

9. The sealing element according to claim 8 , wherein the radial lubricant groove opens into a geometrical area of the sealing element undercut relative to the axial direction thereof on the stud side, which serves to enable interlocking connection of the annular dish-shaped plate to the sealing element.

10. The sealing element according to claim 1 , wherein two outer circumferential areas of the sealing element opposite one another in a radial direction of the sealing element perpendicular to the axial direction thereof are drawn in, in such a manner that the outer circumferential areas form a narrowing that extends in the axial direction of the sealing element, and as a result, in a radial section through the narrowing the sealing element has a substantially elliptical outer circumference.

11. The sealing element according to claim 1 , wherein on an inner circumferential surface which in a fitted condition is in contact with a ball stud, the sealing element has an all-round undulating contour which, in the fitted condition, forms in combination with the ball stud a gap seal.

12. The sealing element according to claim 1 , wherein the sealing area on the housing side has a geometrical area undercut relative to the axial direction of the sealing element, to enable interlocking connection of the sealing element to a housing of a lubricated ball joint.

13. The sealing element according to claim 1 , wherein at the axial end on the stud side the sealing element has an all-round, annular outer elastic lip which, in a fitted condition of the sealing element, prevents any entry of dirt into the ball joint, the annular outer elastic lip being orientated in the axial direction of the sealing element and the annular outer elastic lip having a radially outer circumferential surface which aligns with a radially outer circumferential surface of the sealing element.

14. A ball joint with a sealing element having a sealing area on a housing side and a sealing area on a stud side a distance away therefrom in an axial direction of the sealing element, and an outlet opening is arranged between the sealing area on the housing side and the sealing area on the stud side and extends through the sealing element to allow passage of spent lubricant, the outlet opening extends in the axial direction of the sealing element, passing completely through the sealing element in the axial direction thereof, and the sealing element is securely fixed onto the ball joint and the ball joint comprises an annular dish-shaped plate securely connected to the sealing element, and the annular dish-shaped plate has an all-round bead on an inside circumference thereof, wherein the dish-shaped plate is received within an annular inner groove in an axial end of the sealing element on the stud side such that the all-round bead at least partially blocks the outlet opening.

15. The ball joint according to claim 14 , wherein the annular dish-shaped plate has a smaller outer diameter than the sealing element.

16. The ball joint according to claim 14 , wherein to produce the secure connection an all-round collar of the annular dish-shaped plate engages with interlock in the inner groove, and the inner groove being formed at an undercut geometrical area on the stud side of the sealing element.

17. The ball joint according to claim 16 , wherein a gap remains between the all-round collar and the inner groove to allow passage of spent lubricant.

18. A two-point control arm with a ball joint having a sealing element that has a sealing area on a housing side and a sealing area on a stud side a distance away therefrom in an axial direction of the sealing element, and an outlet opening is arranged between the sealing area on the housing side and the sealing area on the stud side and extends through the sealing element to allow passage of spent lubricant, the outlet opening extends in the axial direction of the sealing element, passing completely through the sealing element in the axial direction thereof, and the sealing element is securely fixed onto the ball joint and the ball joint comprises an annular dish-shaped plate securely connected to the sealing element, and the two-point control arm is in the form of either a steering rod or a track rod, an axial end of the sealing element on the stud side has an annular inner groove which receives an annular dish-shaped plate, and the annular dish-shaped plate has an all-round bead on an inside circumference thereof which at least partially blocks the outlet opening.

Assignees

• Zahnradfabrik Friedrichshafen
• Zf Gainesville Llc
• Zf Gainsville Llc

Inventors

• Sokolihs Dirk
• Petersen Uwe
• Vierthaler Joe
• Di Sarno Marco
• Hardt Holger

Classifications

• F16C11/068

  Special features relating to lubrication · CPC title

• F16C11/0671 Primary

  allowing operative relative movement of joint parts due to flexing of the sealing means · CPC title

• F16C11/069

  with at least one separate part to retain the ball member in the socket; Quick-release systems · CPC title

• F16C2361/41

  Couplings · CPC title