Wire wound flexible shaft having extended fatigue life and...

F - Mech Eng,Light,Heat,Weapons – 16 – C

Patent

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F16C 1/24 (2006.01) F16C 1/20 (2006.01)

Patent

CA 2506604

A wire wound flexible shaft has layers of wire wound one upon another, with a dry film of lubricant bonded to the outer surfaces of a number of the outer layers; or if desired, to the outer surfaces of all layers of the shaft. The lubricant is applied by preheating the partially completed flexible shaft to a temperature substantially above 212~F but below the decomposition temperature of the lubricant. A liquid medium comprising a carrier and particles of the lubricant is sprayed onto the shaft surface, causing the liquid to vaporize and the lubricant particles to be deposited on the shaft. One or more successive wire layers may then be wound onto the partially completed shaft and the spraying step repeated. Thereafter the shaft is heated to cause the lubricant particles to bond to the adjacent wire layers and to reduce internal stresses in the shaft.

L'invention porte sur un arbre flexible fait d'un enroulement de fils disposés en couches bobinées les unes sur les autres, des couches de lubrifiant sec étant disposées sur les couches extérieures de fils, ou sur toutes. Le lubrifiant s'applique sur l'arbre partiellement terminé à une température dépassant sensiblement 212 ·F, mais inférieure à la température de décomposition du lubrifiant. A cet effet on pulvérise sur la surface de l'arbre un milieu liquide comprenant un véhicule et des particules de lubrifiant qui, en se vaporisant, dépose les particules de lubrifiant sur l'arbre. On peut ensuite bobiner une ou plusieurs couches successives de fils sur l'arbre partiellement terminé, puis répéter les pulvérisations. Finalement, on chauffe l'arbre pour faire adhérer les particules de lubrifiant aux couches de fils contiguës et réduire les tensions internes dans l'arbre.

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