Method for linking elements to hollow shafts, preferably for...

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

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F16H 53/02 (2006.01) B21D 53/84 (2006.01) B23P 11/00 (2006.01) F01L 1/047 (2006.01) B21D 26/02 (2006.01)

Patent

CA 2501976

Standard camshafts, produced by an internal high-pressure forming method (IHU) and whereof the cam rings (1) are fixed on a hollow shaft by force-closure and form-closure, said rings being produced in accordance with their function in a separate process, have the drawback that the cam rings are deformed, mainly in the tip zone (2) of the cams, can result in cracking or breaking. The invention is characterized in that the cam ring is produced in terms of its material properties such that in its outer zone (3) the material is hard and resilient over a specific length while exhibiting nevertheless low plastic deformation, the zone located beneath being relatively flexible and plastically deformable. The inventive camshafts are used almost exclusively in motor vehicles engines.

Les arbres à cames classiques, produits par un procédé de formage par haute pression interne (IHU) et dont les bagues à cames (1) sont fixées sur un arbre creux par liaison de force et de forme, ces bagues étant produites conformément à leur fonction dans un procédé séparé, présentent l'inconvénient que la déformation de la bague à cames, principalement au niveau (2) de la pointe des cames, peut entraîner l'apparition de fissures ou de cassures. Selon l'invention, la bague à cames est produite de telle sorte, du point de vue de ses caractéristiques de matériau, que dans sa zone extérieure (3) le matériau soit dur et élastique sur une épaisseur définie, tout en étant néanmoins que faiblement déformable plastiquement, la zone située en dessous étant relativement souple et déformable plastiquement. Les arbres à cames produits selon l'invention sont utilisés presque exclusivement dans des moteurs de véhicules.

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