CV Joint Boot Inner Seal Lubricant Migration Prevention
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Solution Overview
Problem
CV joint boots face lubricant migration issues, leading to potential tearing at high rotational speeds due to lubricant overstress, which existing technologies fail to adequately prevent.
Innovation Solution
An inner seal system comprising a front can sealing portion and a shaft sealing portion, with a shield portion extending between them to inhibit lubricant migration into the CV joint boot, using a combination of sealing and shielding mechanisms to prevent lubricant leakage and contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a CV joint boot is used to protect the bearing, then the boot protects the bearing from contamination, but lubricant can migrate into the boot interior and cause tearing at high rotational speeds
Solution Approach 1:
The sealing system is divided into multiple independent sealing portions (first sealing portion at the front can interface, second sealing portion at the shaft interface, and intermediate sealing portion). Each sealing portion independently addresses lubricant migration at different locations, preventing lubricant from reaching the boot interior while maintaining boot protection.
Solution Approach 2:
The inner seal acts as an intermediary component between the bearing and the CV joint boot. It includes multiple sealing portions that create barrier interfaces to prevent lubricant from migrating into the boot, thereby protecting the boot from lubricant-induced tearing while allowing the boot to continue its contamination protection function.
2Reliability
If multiple sealing portions are added to prevent lubricant migration, then lubricant migration is inhibited, but the device complexity increases
Solution Approach 1:
Multiple sealing functions are merged into a single inner seal component. The first sealing portion, intermediate sealing portion, and second sealing portion are integrated into one piece that fits within the existing CV joint assembly, providing comprehensive lubricant migration prevention without requiring multiple separate components or complex assembly procedures.
Solution Approach 2:
The inner seal serves multiple functions simultaneously: it seals against the front can, seals against the shaft, prevents lubricant migration, and protects the boot. This multi-functional design achieves comprehensive protection while maintaining relatively simple device structure by consolidating multiple sealing roles into a single component.
Data Source
AI summary
A combined CV joint boot and inner seal includes a boot portion having a first end and a second end and having a shaft sealing portion at the first end for sealing with a first shaft of the CV joint. A front can sealing portion is positioned at the second end of the boot portion. An inner seal portion extends generally inwardly towards the CV joint longitudinal axis to block lubricant from migrating into the interior of the boot portion.