CV Joint Boot Assembly With Flexible Retainer Locking
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Solution Overview
Problem
Existing boot assemblies for constant velocity joints lack effective retention mechanisms that prevent unintended removal and ensure secure engagement with the joint member, leading to potential contamination and lubricant loss.
Innovation Solution
A boot assembly featuring a flexible and resilient retainer with a movable inward portion that engages a void on the joint member, allowing secure coupling and inhibiting removal by flexing outward to align with the joint's mounting surface, ensuring secure retention within the void.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional boot assembly without a retainer mechanism is used, then the structure is simpler, but the boot assembly can be unintentionally removed from the joint member
Solution Approach 1:
The boot can is segmented into a mounting portion and a retainer portion, with the retainer being a separate movable component that can flex between engaged and disengaged states. This segmentation allows the retention function to be added without making the entire boot assembly rigid or overly complex.
Solution Approach 2:
The retainer is designed as a dynamic component that can move between different positions (engaged and disengaged states) rather than being a fixed structure. This dynamic capability allows the simple press-on installation while providing secure retention through the flexible engagement with the joint member.
2Reliability
If a rigid retainer structure is used, then the retention is more secure, but the retainer cannot flex to engage and disengage from the joint member
Solution Approach 1:
The retainer's flexibility parameter is optimized to allow it to flex under installation forces for easy engagement, while maintaining sufficient rigidity when engaged to provide secure retention. The material and geometry are selected to achieve the right balance between flexibility and structural integrity.
3Reliability
If the inner surface of the retainer is at a constant angle, then the manufacturing is simpler, but the retainer does not properly engage the void on the joint member
Solution Approach 1:
The retainer's inner surface has varying angles at different locations, with specific angular variations designed to match the geometry of the void on the joint member. This local quality variation ensures proper engagement at the critical interface while keeping other portions of the retainer simpler in form.
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 provides enhanced retention and protection against contamination by ensuring the boot assembly remains securely attached to the joint member, maintaining lubrication and extending the joint's operational life.
Implementation Method 1
The retainer is flexible and resilient so that at least a portion of the retainer is movable relative to the remainder of the boot can
Data Source
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AI summary
A boot assembly for a joint includes a boot and a boot can coupled to the boot at a connecting portion. The boot can includes a mounting portion including a flange having an inner surface and a retainer. The retainer is connected to the flange at a first location and is separate from the flange at a second location spaced from the first location. The retainer includes an inward portion spaced from the first location, and the inward portion is arranged closer to the axis than is the inner surface of the retainer between the first location and a midpoint of the retainer. The inner surface of the retainer is not at a constant angle relative to the axis along the length of the retainer.