Double Offset CV Joint Track Geometry for High-Angle Torque Loads
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional constant velocity joints experience track deformation and abnormal noise during high angular articulation, particularly in electric vehicles requiring increased driving torque and high angular articulation capabilities.
Innovation Solution
A symmetric double offset constant velocity joint design featuring outer and inner race tracks with specific curved and linear sections, arranged on an offset eccentric axis to increase the depth of ball engagement and prevent track deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional single offset track design is used, then the structure is simple, but track deformation occurs under high angular articulation
Solution Approach 1:
The race track is divided into multiple curved sections (first curved section, second curved section, third curved section, fourth curved section) with different radii of curvature. This segmentation allows each section to handle specific stress conditions during high angular articulation, preventing overall track deformation while maintaining structural integrity.
Solution Approach 2:
Different sections of the race track are designed with different local geometries - the first and second curved sections have different radii from the third and fourth curved sections. This local quality variation optimizes the stress distribution at different locations along the track, enabling the structure to withstand high angular articulation without deformation.
2Ease of manufacture
If conventional single offset track design is used, then manufacturing is simple, but abnormal noise occurs due to track deformation
Solution Approach 1:
The track is segmented into multiple curved sections with varying radii, which prevents deformation-induced noise while maintaining manufacturability through standardized curved section fabrication processes.
Solution Approach 2:
The race track employs multiple curved sections with different radii of curvature instead of straight or single-curved designs. This curvature variation ensures smooth ball transition between sections, eliminating impact noises that would occur with abrupt geometric changes, while still being manufacturable using conventional curved surface machining techniques.
3Power
If increased driving torque is required for electric vehicles, then power transmission capability improves, but track deformation increases
Solution Approach 1:
The race track is designed with different local curvature radii in different sections. The first and second curved sections have different radii from the third and fourth curved sections, creating zones of varying stress distribution. This allows the track to handle increased driving torque loads in electric vehicles by localizing stress management, preventing overall track deformation under high torque conditions.
Solution Approach 2:
Multiple curved sections with varying radii of curvature are employed to distribute the high torque loads more evenly across the ball contact points. The curvature variation ensures that no single section bears excessive stress, preventing track deformation even when transmitting the increased driving torque required for electric vehicle acceleration and hill climbing.
Data Source
AI summary
The present disclosure provides a symmetric double offset constant velocity joint comprising: an outer race having an outer race track formed on its inner surface; an inner race having an inner race track formed on its outer surface; balls disposed between the outer race and the inner race; and a cage disposed between the outer race and the inner race for supporting the balls, wherein the outer race track includes an outer race linear track, an outer race outer curved track formed outside the outer race linear track, and an outer race inner curved track formed inside the outer race linear track, wherein the inner race track includes an inner race linear track, an inner race outer curved track formed outside the inner race linear track, and an inner race inner curved track formed inside the inner race linear track, wherein the center point of the outer race outer curved track, the center point of the outer race inner curved track, the center point of the inner race outer curved track, and the center point of the inner race inner curved track are arranged on an offset eccentric axis line spaced apart from the central axis of the outer race by a first distance in a vertical direction.