Convoluted boot and constant velocity joint lubricant
AssigneeGKN Automotive AG
InventorsHerbert Konegen, Hans Schreiber, Lothar Gasper
Life of this patent
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Abstract
A convoluted boot for constant velocity joints and a constant velocity joint lubricant for use in such a convoluted boot. An additive which is added to the constant velocity joint lubricant and/or to the convoluted boot material is provided. The additive comprises amide waxes and also may include hydrocarbon oils. Use is made, in particular, of monoamides and/or diamides of carboxylic acids with 8 to 50 carbon atoms to form, by diffusion, a lubricating film on the surface of a convoluted boot. Furthermore, oleic acid amide and/or ethylenediamine distearate result in a particularly early formation of a lubricating film on the outer boot surface and thus to a long-term prevention of noise.
Claims60
A convoluted boot for a constant velocity joint comprising a thermoplastic elastomer material based on polyurethane (TPU), polyamide (TPA), polyolefins (TPO), polyester (TPEE), or a thermoplastic elastomer vulcanizate (TPV) or a thermoplastic poly-ether-ester-elastomer (TEEE), wherein the convoluted boot material contains an additive comprising amide waxes in a concentration below a saturation limit, and diffusion-promoting admixtures.
A lubricant for a constant velocity joint with a convoluted boot, the lubricant comprising an additive which contains amide waxes and diffusion-promoting admixtures.
Dependencies are inferred from the claim text.