Constant Velocity Joint Assembly With Non-Blocking Spherical Rollers
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Solution Overview
Problem
The assembly of constant velocity joints with increased diameter spherical rollers is hindered due to the spherical rollers blocking the shaft hole, making it difficult to efficiently insert the transmission shaft, especially when the rollers are inclined towards the opening of the cylindrical portion.
Innovation Solution
A constant velocity joint design featuring a bottomed cylindrical portion with a first inner bottom wall portion closer to the center and a second inner bottom wall portion closer to the opening, where the spherical rollers are held by protruding holders, allowing the first inner bottom wall portion to abut against the inner side outer circumferential surface and the second inner bottom wall portion to be separated from the outer side outer circumferential surface, preventing the rollers from blocking the shaft hole.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the diameter of spherical rollers is increased to increase transmittable torque, then the torque transmission capability is improved, but the spherical rollers block the shaft hole when inclined, making assembly difficult
Solution Approach 1:
The inner bottom wall surface is segmented into two distinct portions: a first inner bottom wall portion and a second inner bottom wall portion. This segmentation allows different functional zones to be created - the first portion prevents roller inclination that would block the shaft hole, while the second portion provides support for the rollers, thereby enabling both large roller diameter for high torque and easy assembly
Solution Approach 2:
Different portions of the inner bottom wall surface are given different local qualities and functions. The first inner bottom wall portion is positioned to prevent harmful roller inclination, while the second inner bottom wall portion provides support. This local differentiation allows the structure to simultaneously achieve torque transmission capability and assembly efficiency
2Shape
If the spherical rollers are disposed at an innermost location in the cylindrical portion, then the structural compactness is improved, but the opening side end portions of the rollers block the shaft hole when the rollers are inclined
Solution Approach 1:
The first inner bottom wall portion is positioned in advance to counteract the tendency of spherical rollers to incline toward the opening side. By providing this preventive structural feature before assembly, the design stops harmful roller inclination at its source, ensuring that even when rollers are disposed at the innermost location for compactness, they cannot block the shaft hole during transmission shaft insertion
3Ease of manufacture
If the inclined portion is formed on the inner bottom wall surface closer to the opening side, then the manufacturing process is simplified, but the spherical rollers are easily inclined in directions that block the shaft hole
Solution Approach 1:
The inner bottom wall surface is divided into two portions with different local qualities and functions. The first inner bottom wall portion is positioned to prevent roller inclination that would block the shaft hole, while the second inner bottom wall portion provides support. This local differentiation allows the structure to simultaneously achieve torque transmission capability and assembly efficiency
Data Source
AI summary
A constant velocity joint includes spherical rollers. At least parts of first inner bottom wall portions provided on an inner bottom wall surface of a cylindrical portion of the constant velocity joint are located in closer proximity to the side of an opening of the cylindrical portion than second inner bottom wall portions. When the spherical rollers are disposed at an innermost location inside the cylindrical portion and the axial directions of the spherical rollers are perpendicular to the axial direction of the cylindrical portion, at least parts of the first inner bottom wall portions abut against inner side outer circumferential surface portions of the spherical rollers, and the second inner bottom wall portions are separated away from outer side outer circumferential surface portions of the spherical rollers.