Constant velocity universal joint

Abstract

The invention provides a small-sized constant velocity universal joint having high strength and excellent operability and durability. The constant velocity universal joint satisfies the expression of 11.0 DEG <= phiT <= 15.0 DEG, where phiT is an offset angle formed by the center OTO of curvature of a guide groove (2b) of an outer member (2), the point Q at which a plane P of the joint and PCD cross, and the center OTI of curvature of a guide groove (3b) of an inner member (3).

Description

technical field [0001] The present invention relates to a constant velocity universal joint used in power transmission systems of automobiles and various industrial machines. Among the constant velocity universal joints that transmit torque smoothly at all times, the so-called fixed constant velocity universal joints do not slip (pitch) in the axial direction. Background technique [0002] like figure 2 and image 3 As shown, a BJ (ball joint) 1 used for a drive shaft of an automobile or the like is composed of an outer ring 2 , an inner ring 3 , torque transmission balls 4 , and a cage 5 . A cage 5 is provided between the outer ring 2 and the inner ring 3, and the cage 5 is in spherical contact with the spherical inner peripheral surface 2a of the outer ring 2 and the spherical outer peripheral surface 3a of the inner ring 3 respectively (for example, refer to Patent Document 1). . [0003] A plurality of curved guide grooves 2b, 3b are respectively formed on the inner ...

AI Technical Summary

Problems solved by technology

[0006] As mentioned above, due to the offset of the guide grooves 2b and 3b, the depths of the two guide grooves are not uniform in the axial direction.

Therefore, when the torque transmission ball 4 transmits a high load in a place where the guide groove is shallow (at a large active angle), the contact ellipse caused by the contact with the torque transmission ball 4 increases, and the contact ellipse goes beyond the guide where the gravity is concentrated. Grooved shoulder, resulting in possible defection of the shoulder

As a countermeasure, it is conceivable to increase the diameter of the torque transmission ball 4 or the pitch circle diameter (PCD) to reduce the surface pressure. However, the increase in the outer diameter of the outer ring 2 will cause the disadvantage of increasing the constant velocity universal joint.

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