CV Joint Inner Ring Chamfer Geometry for Ball Pressure Relief
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Solution Overview
Problem
In constant-velocity universal joints, the boundary part between the inner-ring ball groove and the outer spherical surface of the inner ring can deform outward, leading to potential noise generation and interference with the holder due to high pressure on the ball, especially when the contact position of the ball is near the edge of the inner-ring ball groove.
Innovation Solution
A chamfered portion is introduced between the inner-ring ball groove and the outer spherical surface of the inner ring, comprising a linear section and an arc section, which prevents the ball from deforming outward and reduces pressure on the ball by ensuring continuous contact with the arc section when the groove is slightly deformed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a chamfered portion with a linear shape is provided between the inner-ring ball groove and the outer spherical surface, then the boundary part deformation is reduced, but the ball may still be deformed due to high pressure when contact position is near the edge
Solution Approach 1:
The invention changes the chamfered portion shape from linear to arc-shaped (curved). The arc-shaped chamfered portion has a radius of curvature that is 0.5 to 2.0 times the ball radius, creating a curved surface that matches the ball's geometry. This curvature allows the ball to maintain full contact with the chamfered portion even when the contact position is near the edge of the inner-ring ball groove, preventing high pressure concentration and ball deformation that causes noise.
2Stress or pressure
If the chamfered portion is made protruding in radial direction, then the ball contact pressure is reduced, but the structure complexity increases
Solution Approach 1:
The invention optimizes the radius of curvature parameter of the arc-shaped chamfered portion to be 0.5 to 2.0 times the ball radius. This parameter range is carefully selected to achieve the optimal balance: the chamfered portion protrudes enough in the radial direction to reduce ball contact pressure and prevent ball deformation, but not so much as to create unnecessary structural complexity. The specific radius range ensures effective load distribution while maintaining manufacturing feasibility.
Data Source
AI summary
A constant-velocity universal joint includes: an outer ring; an inner ring; a plurality of balls that engages with the outer-ring ball grooves and the inner-ring ball, grooves; and a holder that is interposed between an inner spherical surface of the outer ring and an outer spherical surface of the inner ring and in which a holding window for holding the plurality of balls is formed. A chamfered portion is formed in the inner ring. The chamfered portion includes a linear section portion that is formed in a linear shape in a section perpendicular to a moving locus of the center of the corresponding ball and an arc section portion that is formed in a protruding arc shape in the section perpendicular to the moving locus of the center of the corresponding ball.