Ntn Corporation

Morihiro Wada

Tatsuro Sugiyama

Masazumi Kobayashi

Tohru Nakagawa

Tsuyoshi Ueno

Masafumi Osugi

Sugiyama Tatsuro

A method of manufacturing an outer joint member of a constant velocity universal joint includes forming cup and shaft members of medium carbon steel, forging the cup member to have integrally formed cylindrical and bottom portions, and machining a joining end surface on an outer surface of the bottom portion after the forging. The method also includes preparing the shaft member to have a joining end surface to be joined to the bottom portion of the cup member, which is formed by machining, bringing the joining end surfaces of the cup and shaft members into abutment against each other and welding the cup and shaft members by radiating a beam from an outer side of the cup member to an abutment portion between the cup and shaft members in a radial direction of the cup member.

Method of manufacturing outer joint member of constant velocity universal joint, and outer joint member

A fixed constant velocity universal joint includes: an outer ring having a plurality of track grooves extending axially in its inner spherical surface; an inner ring having a plurality of track grooves extending axially in its outer spherical surface; torque transmission balls arranged in ball tracks formed by cooperation of the track grooves of the outer ring and the track grooves of the inner ring; and a cage having pockets for retaining the torque transmission balls. The center of the track grooves of the outer ring and the center of the track grooves of the inner ring are offset from the spherical center of the inner spherical surface and the spherical center of the outer spherical surface, respectively, by the same distance axially in opposite directions. An axial clearance between the pockets and the torque transmission balls is set within the range of &#x2212;0.006 and &#x2212;0.035 mm. A spherical portion clearance between the cage and the inner ring is set so that a clearance-to-diameter ratio falls within the range of 0.9 and 2.3.

Fixed constant velocity universal joint

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Shizuoka, Japan

Morihiro Wada