Fixed-type constant-velocity universal joint

Abstract

Internal dimensions for fixed-type constant velocity universal joints are defined to optimize the geometry of the components of the joints and to readily achieve a larger operating angle of the joints. In the joint, the track grooves of an outer ring and an inner ring are tapered by an angle not exceeding 12 DEG . The ratio (f / PCR) of the cage offset amount f to PCR is greater than 0 and smaller than or equal to 0.12. The ratio (Do / d) of the cage outer diameter (Do) to the ball diameter (d), the ratio (t / d) of the cage wall thickness (t) to the ball diameter (d), and the ratio (w / d) of the cage width (w) to the ball diameter (d) are such that 3.9<=Do / d<=4.1, 0.31<=t / d<=0.34, and 1.8<=w / d<=2.0, respectively. The end of the spherical outer surface of the cage adjacent to the open end is axially extended, and the end of the spherical inner surface of the cage adjacent to the open end is tapered so that the tapered surface has an increasing diameter toward the end of the spherical outer surface adjacent to the open end. Part of the spherical outer surface of the cage is cut on the open end side of pockets, and the outer diameter of the cage across the two opposing planer cut faces is smaller than the spigot diameter of the outer ring.

Description

technical field [0001] The invention relates to a fixed constant velocity universal joint. Constant velocity joints are used for power transmission in automobiles and various industrial machinery, and transmit torque from a driving shaft to a driven shaft at a constant angular velocity. Two types of constant velocity universal joints are known: the fixed type, which allows only angular displacements, and the slidable type, which allows both angular and axial displacements. Background technique [0002] A typical fixed constant velocity universal joint includes the following components: an outer joint member connected to a driving or driven shaft in a torque-transmitting manner; an inner joint member connected to a driven or driving shaft in a torque-transmitting manner; a plurality of balls between the inner and outer joint members to transmit torque; and a cage retaining the balls within the bisecting section of the corner between the driving and driven shafts. [0003] R...

AI Technical Summary

Problems solved by technology

[0006] While each of the fixed constant velocity universal joints described in the above publications has inner and outer joint members characterized by tapered track grooves that allow for greater joint operating angles, the current joint The trend towards light weight and compact structure limits the outer diameter of the outer joint member, and if the taper angle of the track groove increases, the wall thickness of the outer joint member will inevitably decrease, resulting in a decrease in the strength of the outer joint member

The increase in the taper angle of the track groove also results in an increase in the load exerted by the balls contained in the cage on the side walls of the cage pocket

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