Tripot Joint Housing Ring for Easier Assembly and Disassembly
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Solution Overview
Problem
Constant velocity joints, such as tripot joints, face challenges during assembly and disassembly due to the need for sufficient push and pull forces, which can cause distortion of the roller tracks and require higher disassembly forces compared to assembly forces, necessitating a feature that facilitates both operations without compromising the housing's integrity.
Innovation Solution
A tripot housing design featuring a ring with an interference fit on a tapered and cylindrical region, providing a gripping feature that acts as a push/pull mechanism to facilitate assembly and disassembly while preventing unwanted movement during disassembly, ensuring the ring remains engaged with the shoulder to maintain structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a push/pull feature is added to facilitate assembly and disassembly, then ease of operation is improved, but the device complexity increases
Solution Approach 1:
The housing outer surface is segmented into distinct functional regions: a first region for ring engagement and a second region for structural continuity. This segmentation allows the push/pull feature to be integrated without compromising the overall housing integrity or requiring additional separate components.
Solution Approach 2:
The push/pull feature is merged directly into the housing structure itself rather than being a separate component. The ring engages with the housing's integrated regions, combining the fastening function with the housing structure to avoid increasing device complexity while maintaining ease of operation.
2Device complexity
If the wall thickness of the tripot housing is reduced to accommodate the push/pull feature, then device complexity is reduced, but the roller tracks may become distorted
Solution Approach 1:
The housing exhibits local quality variations with different regions serving different functions. The first region is designed for ring engagement while the second region maintains sufficient thickness for structural support. This localized differentiation allows the push/pull feature to be implemented without compromising roller track integrity in critical areas.
Solution Approach 2:
The push/pull feature is implemented by utilizing the radial dimension through the ring engagement rather than reducing wall thickness in the axial dimension. The housing wall thickness is maintained in the axial direction to prevent roller track distortion, while the radial dimension accommodates the ring interference fit for the push/pull function.
3Ease of operation
If a ring with interference fit is used for push/pull function, then ease of operation is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The interference fit parameters are optimized to balance ease of operation with manufacturing feasibility. The first region is designed with specific dimensional parameters that provide sufficient engagement for the push/pull function while maintaining tolerances that are achievable through standard manufacturing processes. The gradual transition in the interference zone helps distribute stresses and reduces sensitivity to dimensional variations.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution allows for reliable assembly and disassembly of the tripot housing from a drive source, maintaining the structural integrity of the roller tracks and reducing the required disassembly force, ensuring efficient and distortion-free operations.
Implementation Method 1
A ring has an inner surface disposed in an interference fit on first region
Data Source
AI summary
A tripot housing and method of manufacture thereof. The tripot housing includes a housing body extending along an axis between a first end having an end wall and an open second end. A drive shaft extends from the end wall along the axis away from the second end. The housing body has an outer surface and an inner surface. The inner surface defines a guide channel that extends between the first end and the second end. The outer surface has a first region extending axially along a direction from the first end toward the second end to a shoulder that extends radially outwardly from the first region. The outer surface has a second region extending axially from the shoulder toward the second end. A ring has an inner surface disposed in an interference fit on first region and an outer surface extending radially outwardly from the second region.