CV Joint Boot Assembly With Flexing Retainer for Lubricant Sealing
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Solution Overview
Problem
Constant velocity joints face challenges in retaining lubricant and preventing contamination, as existing boot assemblies may not securely engage with the joint member, leading to potential removal and loss of lubricant during operation.
Innovation Solution
A boot assembly featuring a flexible boot and boot can with a retainer that is connected at one location and separate at another, allowing for movement and engagement with the joint member, which includes a flange and inward portion that flexes to secure within a void on the joint member, preventing unintended removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a boot assembly is designed to securely engage with the joint member, then lubricant retention and contamination prevention are improved, but the device complexity increases due to the retainer structure
Solution Approach 1:
The boot assembly is segmented into distinct functional components: the boot itself, the boot can, and the retainer. The retainer is further segmented with a connected portion attached to the boot can and a separate engaged portion that interfaces with the joint member. This segmentation allows each component to perform its specific function independently while contributing to overall reliability through secure engagement.
Solution Approach 2:
The retainer is nested within the boot can structure, with the connected portion integrated into the boot can and the engaged portion extending outward to interface with the joint member. This nesting approach consolidates multiple functions into a single integrated component, improving reliability without proportionally increasing overall device complexity.
2Reliability
If the retainer is made flexible and movable to engage with the joint member, then engagement reliability is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The retainer is designed as a dynamic component that can flex and move between different positions. The connected portion remains relatively fixed while the engaged portion can deflect to accommodate variations in joint member geometry and assembly tolerances. This dynamic capability ensures reliable engagement without requiring extremely tight manufacturing precision.
Solution Approach 2:
The retainer's physical parameters, particularly its flexibility and deflection capability, are optimized to balance engagement reliability with manufacturing feasibility. The retainer is designed to deflect within specific ranges that accommodate normal manufacturing variations while maintaining secure engagement, reducing the stringency of precision requirements.
3Reliability
If the inward portion of the retainer is positioned closer to the axis to engage the joint member, then engagement effectiveness is improved, but the risk of interference with joint operation increases
Solution Approach 1:
The retainer features localized engagement zones with different radial positions. The engaged portion extends inward to effectively engage the joint member at critical locations, while other portions of the retainer and boot assembly maintain appropriate clearances to avoid interfering with joint operation. This local differentiation of engagement characteristics ensures effectiveness without harmful interference.
Solution Approach 2:
The retainer is segmented into an engaged portion that extends inward to contact the joint member and a connected portion that remains outward. This segmentation allows the engaged portion to be positioned optimally for effective engagement while the connected portion and boot structure provide support and maintain appropriate clearances to prevent interference with joint operation.
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 boot assembly effectively retains lubricant within the joint by securely engaging with the joint member, inhibiting contamination and ensuring consistent operation through a wide range of angles.
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 between an unflexed state and a flexed state
Data Source
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.