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Method for producing a bellows

A bellows, thermoplastic elastomer technology, applied in the field of bellows, can solve the problem of not being able to manufacture bellows

Active Publication Date: 2020-10-13
GKN DRIVELINE INT GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, bellows which meet the requirements of modern joint constructions and of the high temperatures occurring especially at high rotational speeds cannot be produced by the method disclosed in DE 11 2006 003 257 B4

Method used

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  • Method for producing a bellows
  • Method for producing a bellows

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Experimental program
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Embodiment Construction

[0027] First, a typical arched bellows with external reinforcement was prepared from a mixture of thermoplastic block copolymer and rigid polybutylene terephthalate, soft polytetrahydrofuryl terephthalate, One end of the bellows is fixed on the joint housing, and the other end is fixed on the shaft.

[0028] First, a premix was prepared from 15% by weight of triallyl isocyanurate and 85% of thermoplastic block-copolyester, relative to the total amount of the premix. In the mixture thus obtained, the triallyl isocyanurate content was respectively 0% by weight, 1.5%, 2.25%, 3%, 3.75% and 4.5% ( weight), and the bellows are produced by an injection molding process, for example using a screw extruder. The nozzle discharge temperature of the screw extruder was 245°C.

[0029] Electron irradiation is then carried out with an electron beam unit with eight electron beams directed uniformly from above over the entire outer surface of the arched bellows to ensure a uniform energy inpu...

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Abstract

To solve the problem of providing a method for producing a bellows, more particularly a roll bellows and a folding bellows, by means of which method bellows can be produced that can be used at highertemperatures such as those prevailing in modern articulated constructions, the invention proposes a method of this kind using a mixture, comprising at least one thermoplastic elastomer selected from the group of copolysters with a hard segment and a soft segment, wherein in a first step the at least one thermoplastic elastomer is mixed with approximately 0.8 wt.% to approximately 5 wt.% triallyl isocyanurate, based on the total amount of the mixture; in a second step the bellows is produced; and in a third step, the bellows is exposed to an ionising irradiation in a range from approximately 140 kGy to approximately 350 kGy.

Description

technical field [0001] The invention relates to a method for producing a bellows from a mixture comprising at least one thermoplastic elastomer and to a bellows produced by the method. Background technique [0002] This type of bellows, especially arched bellows and folded bellows is used for sealing components. The bellows are especially used for sealing joints in vehicle engineering. The bellows includes a first collar of larger diameter for attachment to a component, such as a joint part in a swivel joint, and a second collar, typically of smaller diameter, for For attachment to another component such as a shaft. Between the larger first and second collars there is a bellows section which has the shape of a half torus in the case of arched bellows and in the case of folded bellows The bellows section is conical and includes folded pleated regions. The pleated region may also have pleats of equal diameter and thus be at least partially further cylindrical. Arched bell...

Claims

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Application Information

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IPC IPC(8): B29D22/02
CPCB29D22/023B29L2031/703B29C2035/085B29C2035/0877B29C2049/023B29C49/06B29C49/04B29C48/00B29C45/02B29K2021/003B29K2067/006B29K2067/003B29C35/0866C08G18/4072C08G18/4202C08G18/4213C08G18/4247C08G18/631C08G18/71G10D11/00C08G63/88B29C45/00C08G63/91
Inventor 托尔斯滕·斯特雷舍夫斯基约阿希姆·韦特弗兰克·喏赫特贝恩德·本德尔
Owner GKN DRIVELINE INT GMBH
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