Fixed constant velocity universal joint

Abstract

A fixed constant velocity universal joint which can attain abrasion resistance against rolling of balls and stabilized high fatigue strength characteristics in the entire angular region. The fixed constant velocity universal joint comprises an outer coupling member having a plurality of track grooves (22) formed in the inner circumferential surface (21), an inner coupling member having a plurality of track grooves (25) formed in the outer circumferential surface (24), a plurality of balls (27) interposed between the track grooves (22) of the outer coupling member and the track grooves (25) of the inner coupling member in order to transmit torque, and a cage (28) interposed between the outer coupling member and the inner coupling member and having a pocket (29) for containing the ball (27). When a maximum working angle is taken, the ball (27) rolls up to the open end (22a) of track groove in the outer coupling member. A hardened layer (S1) is formed in the track groove (22) of the outer coupling member from the back side of the track groove to the opening end of the track groove. The hardened layer (S1) is made thinner at the open end (22a) of the track groove than at the other parts.

Description

Technical field [0001] The invention relates to a fixed constant velocity universal joint, which is used in automobiles or various industrial machinery. Background technique [0002] In fixed constant velocity universal joints, there are Rzeppa type (BJ), undercut free type (UJ) and other types. Ball cage type (BJ) fixed constant velocity universal joint has: outer ring 3, such as Figure 4 It is shown as an outer joint part and a plurality of raceway grooves 2 are formed on the inner peripheral surface 1 at equal intervals in the circumferential direction along the axial direction; an inner ring 6 is used as an inner joint part and is circumferentially formed on the outer peripheral surface 4 A plurality of raceway grooves 5 are formed along the axial direction at equal intervals, and the plurality of raceway grooves 5 are paired with the raceway grooves 2 of the outer ring 3; and a plurality of balls 7 are interposed between the rolling grooves of the outer ring 3. Torque is tr...

AI Technical Summary

Problems solved by technology

However, if the hardened layer S is formed up to the opening end 2a of the track groove 2, the fatigue strength cannot be stably obtained when the rotational force is transmitted in a state where the fixed constant velocity universal joint is at a high angle.

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