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Ball socket with film backing

a technology of film backing and ball socket, which is applied in the field of ball socket, can solve the problems of frequent creeping of thermoplastics under load, and achieve the effects of simple and inexpensive operation, good strength and creep properties, and good tribological properties

Inactive Publication Date: 2007-11-22
ZF LEMFOERDER METALLWAREN AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a bearing shell that has good strength, creep properties, and good tribological properties, all at a low cost and in a simple process. The bearing shell has a reinforced plastic jacketed by a film, which separates the reinforcement from direct contact with the joint ball, reducing wear and tear. The process involves inserting a film into an injection mold and then injecting plastic behind the film to form the shell. The film and core adhere to each other without the need for an additional adhesive or heat treatment. The film and core can be manufactured from basic materials, reducing material costs. The bearing shell also has slots or a rubber ring to compensate for any tolerances during operation.

Problems solved by technology

Thermoplastics frequently tend to creep under load at high temperatures.

Method used

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Examples

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Embodiment Construction

[0017]FIG. 1 shows a cross section through a bearing shell lower part 2 of a multipart bearing shell, which is in the mold 1. The bearing shell lower part 2 has a film 3 with good tribological properties, which is backed with a reinforcing core 4. To prepare the bearing shell lower part 2, a film 3 is first placed into the mold 1. The film 3 may have been preformed in a preceding step, or the forming may be performed by the heated upper part of the mold 1 only when the film 3 is inserted. After the film 3 has been placed into the mold 1, the mold 1 is closed and a plastic 4 used for reinforcement is sprayed behind the film 3. To do so, a corresponding plastic is allowed to enter the closed mold via the sprue 5. Depending on the plastic to be processed, various processes are used. In case of the processing of thermoplastics, the backing of the film is performed predominantly according to a conventional injection molding process. Because of the good adhesive properties of the plastics...

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Abstract

A bearing shell for a ball and socket joint has a core made of plastic, which is jacketed by a film at least in some areas.

Description

CROSS REFERENCE TO RELATED APPLICATION [0001] This application is a divisional application under 37 CFR 1.53(b) of pending prior application Ser. No. 10 / 895,146 filed Jul. 20, 2004.FIELD OF THE INVENTION [0002] The present invention pertains to a ball socket for a ball and socket joint especially for motor vehicles, to the process for manufacturing a ball socket, as well as to the ball and socket joint per se. BACKGROUND OF THE INVENTION [0003] Bearing shells for ball and socket joints especially for motor vehicles are known, for example, from DE 29 617 276 U1. DE 29 617 276 U1 discloses a ball and socket joint, which is extrusion-coated according to a one-component process and in which the bearing shell is produced from a single plastic according to the injection molding technology. This design leads in practice to the problem that when a relatively favorable plastic is used, it is either well suited tribologically in the unreinforced form but lacks sufficient strength, or it posse...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B21K1/76B29C45/00B29C45/14F16C11/06F16C33/20
CPCB29C45/14B29C45/1418B29C45/14336B29C45/14778B29K2105/12B29K2105/16Y10T403/32737F16C11/0633F16C33/201Y10T29/4971Y10T403/32721Y10T403/32713B29L2031/04F16C11/06B29D33/00F16D1/12
Inventor BUDDE, FRANK
Owner ZF LEMFOERDER METALLWAREN AG
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