Ball joint

Patent metadata

Field	Value
Publication number	US-9541124-B2
Application number	US-201314654859-A
Country	US
Kind code	B2
Filing date	Dec 16, 2013
Priority date	Jan 15, 2013
Publication date	Jan 10, 2017
Grant date	Jan 10, 2017

Abstract

A ball joint, in particular, an axial joint, having a ball stud, which is enclosed in a ball socket. The ball socket is enclosed in a joint housing and is integrally formed having at least one spring element in a region of the ball socket that faces away from the opening of the joint housing. The spring element has discontinuities, in particular in the form of slots, so that wear compensation is created by the spring element within the ball joint.

First claim

The invention claimed is:

1. A ball joint ( 1 ) comprising:
a ball stud ( 4 ) having a joint ball being enclosed in a ball socket ( 2 ),
the ball socket being enclosed in a joint housing,
the ball socket ( 2 ) having at least one spring element ( 13 ) in a lower region ( 9 ) of the ball socket ( 2 ) that faces away from an opening of the joint housing, and the spring element being integrally formed with the ball socket,
the spring element ( 13 ) being designed such that, in a pre-assembled state, a gap ( 10 ) being located between an inner wall ( 7 ) of the housing ( 5 ) and an exterior surface of the spring element ( 13 ), and, in an assembled state, the spring element ( 13 ) is pretensioned to generate a pretension in the ball joint ( 1 ),
the spring element ( 13 ) at least partially having discontinuities, which are formed by slots ( 12 ), so that a compensation of at least one of play and wear, within the ball joint, is created by the spring element, and the slots extending fully through the spring element from the exterior surface thereof to an interior surface thereof facing the joint ball, and
the at least one spring element ( 13 ) having a first region ( 9 a ) and a lower second region ( 9 b ), the second region of the at least one spring element adjoins the first region at a bottom of the first region, and, when viewed in cross section, the at least one spring element ( 13 ) in the first and in the second regions ( 9 a , 9 b ) is wedge-shaped, a wall thickness of the ball socket ( 2 ), in the first region ( 9 a ), increases toward the bottom of the first region up to a start of the second region ( 9 b ) and the wall thickness of the ball socket ( 2 ) decreases in the second region ( 9 b ), starting from the bottom of the first region ( 9 a ) to a bottom of the second region.

2. The ball joint ( 1 ) according to claim 1 , wherein the spring element ( 13 ) has the discontinuities in at least one of the first and the second regions ( 9 a , 9 b ).

3. The ball joint ( 1 ) according to claim 1 , wherein the spring element has either three or five slots ( 12 ).

4. The ball joint ( 1 ) according to claim 1 , wherein the first region ( 9 a ) has a greater wall thickness, as compared to remaining regions of the ball socket, so that the wall thickness in the second region ( 9 b ) is lower than the wall thickness in the first region ( 9 a ).

5. The ball joint ( 1 ) according to claim 1 , wherein the ball socket ( 2 ) has a wall thickness with an increasing material thickness, starting from a center ( 11 ) of the joint housing ( 5 ), toward the first region ( 9 a ).

6. The ball joint ( 1 ) according to claim 1 , wherein the ball socket ( 2 ) has a wall thickness with an increasing material thickness, starting from the opening of the joint housing, toward the first region ( 9 a ) facing away from the opening of the joint housing ( 9 a ).

7. The ball joint according to claim 1 , wherein the ball socket ( 2 ) is open at a lower end thereof.

8. The ball joint according to claim 7 , wherein the slots ( 12 ) widen, about a circumference of the ball socket, in a downward direction, toward the lower end of the ball socket.

9. A ball joint comprising:
a ball stud having a joint ball which is enclosed in a ball socket,
the ball socket being enclosed in a joint housing,
the ball socket and the joint housing defining an axis and having openings through which the ball stud extends when the joint ball is received within the ball socket and the joint housing,
the ball socket having at least one spring element in a lower region thereof that is axially opposite the opening of the ball socket and the joint housing, and the spring element being integrally formed with the ball socket,
in a preassembled state, a gap is located between an inner wall of the joint housing and an exterior surface of the spring element, and, in an assembled state in which an axial upper end of ball socket and the joint housing are bent radially inwardly secure the joint ball therein, the spring element is pretensioned to generate pretension in the ball joint,
the spring element having discontinuities, which are formed by slots, which create compensation for at least one of play and wear within the ball joint, the slots in the spring element spanning from the exterior surface of the spring element to an interior surface of the spring element facing the joint ball,
the spring element having an axially upper first region and an axially lower second region, at least the first region of the spring element has a convex cross section, and a bottom of the first region adjoins a top of the second region,
the spring element, in the first and in the second regions, is wedge-shaped when viewed in cross section,
the first region of the spring element of the ball socket having a cross sectional wall thickness that increases from a top of the first region to a top of the second region, and
the second region of the spring element of the ball socket having a cross sectional wall thickness that decreases from the bottom of the first region to a bottom of the second region.

10. The ball joint according to claim 9 , wherein the exterior surface of the spring element, when viewed in cross section, is arcuate from the top of the first region to the bottom of the second region.

Assignees

• Zahnradfabrik Friedrichshafen

Inventors

• Gräber Jürgen
• Ungruh Rainer
• Fricke Cord

Classifications

• Y10T403/32713

  Elastomerically biased or backed components · CPC title

• F16C11/086

  with an elastomeric member in the blind end of a socket · CPC title

• F16C11/0685

  Manufacture of ball-joints and parts thereof, e.g. assembly of ball-joints · CPC title

• Y10T403/32811

  Spring-biased · CPC title

• F16C11/0652 Primary

  combined with a damper other than elastic linings · CPC title