CV Joint Boot Clamping Structure to Prevent Seal Slippage
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Solution Overview
Problem
The sealing performance of constant velocity joint boots deteriorates in harsh environments due to distortion and slippage of clamps, leading to lubricant leakage.
Innovation Solution
A boot clamping structure with main and auxiliary pressing portions, featuring protrusions along the inner and outer surfaces of the clamp and boot, ensures secure fastening and prevents slippage, even under rotational stress at extreme temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple clamp structure is used to fasten the boot, then the device complexity is reduced, but the sealing performance deteriorates due to slippage and distortion in harsh environments
Solution Approach 1:
The clamp incorporates pressing portions with protrusions at specific locations (inner circumferential surface) that create localized high-pressure zones. These pressing portions are strategically positioned to apply concentrated force on the boot, enhancing the sealing interface without requiring complex overall clamp design. The local quality enhancement at the pressing portions resolves the contradiction by providing sufficient sealing force where needed while keeping the rest of the clamp structure relatively simple.
Solution Approach 2:
The pressing portions are designed to apply preliminary pressing force to the boot before the clamp is fully tightened. This preliminary action ensures that the boot is pre-positioned and pre-sealed against the housing, preventing slippage during subsequent tightening operations. The auxiliary pressing portions further enhance this preliminary action by providing additional contact points that stabilize the boot-clamp interface from the outset.
2Reliability
If the clamp is tightly fastened to prevent slippage, then the sealing performance improves, but the boot may be damaged due to excessive pressing force
Solution Approach 1:
The pressing portions concentrate force at specific localized areas rather than distributing it uniformly across the entire boot surface. This localized pressing approach achieves effective sealing at the critical interface between clamp and boot while minimizing overall pressing force on the boot material. The localized nature of the pressing portions prevents excessive force that could damage the boot, resolving the contradiction between sealing performance and boot integrity.
Solution Approach 2:
The pressing portions apply excessive pressing force only at the critical sealing interface areas, not across the entire boot. This partial excessive action ensures sufficient sealing pressure where needed (at the clamp-boot interface) while avoiding excessive force on the broader boot structure. The auxiliary pressing portions complement this by providing additional localized contact points that enhance sealing without requiring uniformly excessive force throughout.
3Adaptability or versatility
If the boot is made more flexible to accommodate distortion, then the adaptability to harsh environments improves, but the sealing performance deteriorates due to increased slippage
Solution Approach 1:
The pressing portions create localized high-friction zones at the clamp-boot interface through their protrusion geometry. These localized high-friction areas provide sufficient grip to prevent slippage even when the boot material is flexible and prone to distortion. The local quality enhancement at the pressing portions ensures that the critical sealing interface maintains high friction characteristics, resolving the contradiction between boot flexibility and sealing reliability.
Solution Approach 2:
The auxiliary pressing portions provide preliminary contact and stabilization of the boot against the clamp before full tightening occurs. This preliminary action ensures that flexible boot material is properly positioned and engaged with the clamp structure from the beginning, preventing slippage that would otherwise occur during the tightening process. The auxiliary portions act as guide elements that prepare the boot-clamp interface for secure engagement.
Data Source
AI summary
It is a technical object of the present invention to provide a boot clamping structure for a constant velocity joint that can securely fasten a clamp and a boot so that the clamp and the boot do not run against each other. To this end, the boot clamping structure for a constant velocity joint of the present invention is a boot clamping structure for a constant velocity joint for fastening both ends of a boot using a clamp, and includes a main pressing portion that is provided to be protruded in a first direction toward the boot on an inner circumferential surface of the clamp.