MECHANISCHES ELEMENT MIT EINER WELLE, DIE SICH MIT EINER PRESSPASSUNG IN EINEM AUFNEHMENDEN GLIED BEFINDET UND DESSEN HERSTELLUNGSVERFAHREN

摘要

A mechanical element has a shaft pressure-fitted into at least one composite engaging member. The shaft has at least one engaging region disposed thereon, and at least one swollen portion formed radially outwardly around the engaging portion. The composite engaging member comprises an engaging body made of sintered alloy and having a recess therein, and a ring-shaped steel inner piece having a hardness not greater than the swollen portion. The inner piece is secured to the inside circumference of the recess of the engaging body by a securing method. The inner piece has a shaft hole formed therein, the shaft hole having a plurality of a larger inside diameter portions and a plurality of a smaller inside diameter portions arranged circumferentially, with the smaller inside diameter arranged to be smaller than the outside diameter of the swollen portion of the shaft. The composite engaging member is then pressure-fitted onto the shaft mainly in a plastic-deforming operation, with a minor chip-removing operation, if any, between the swollen portion and the shaft hole, to form the mechanical element.