Outer member of constant speed universal joint

Abstract

The present invention provides an outer member of a constant velocity universal joint that suppresses the occurrence of cracks in joint portions of the constant velocity universal joint and has stable quality. The outer member of the constant velocity universal joint includes a cup portion (1) formed with a plurality of track grooves and a shaft portion (2) connected at one end to the bottom of the cup portion (1). Induction hardening is performed after joining members with different carbon contents, thereby forming quenching heat-affected parts caused by induction hardening, quenching non-heat-affected parts under induction hardening, and joint heat affected by heat generated during joining Parts, non-heat-affected parts of the joint that are not affected by the heat generated during the joint. In quenching non-heat-affected parts of components with high carbon content, martensite is eliminated in joint heat-affected sites in the end portion (25) including the joint end face (23) joined to components with low carbon content organize.

Description

technical field [0001] The present invention relates to an outer member of a constant velocity universal joint. Background technique [0002] The constant velocity universal joint is installed and used in the power transmission mechanism of automobiles or various industrial machines, and has two shafts on the driving side and the driven side whose intersecting angles can be changed, and the constant velocity The universal joint is connected so as to be able to transmit the rotational moment from the driving side to the driven side at a constant speed. The constant velocity universal joint is roughly divided into a fixed type constant velocity universal joint which allows only angular displacement and a sliding type constant velocity universal joint which allows angular and axial displacement, and can be used separately according to the application. [0003] For example, known fixed-type constant velocity universal joints include a cage type (BJ) and an undercut-free type (U...

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Problems solved by technology

[0009] However, the contents described in the above-mentioned patent documents are all related to the improvement of the strength of the joint part, and do not consider the stability of the quality of the joint part, that is, the suppression of the occurrence of cracks in the joint part.

Even if the strength of the joint is improved, if defects such as cracks occur inside, the quality may be uneven

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