Universal Joint Seal Lip Geometry for Lubrication and Leak Control
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Solution Overview
Problem
Universal joints face challenges in maintaining fluid flow to the seal lips while minimizing wear and preventing fluid loss during high temperature operations, as existing seal geometries either restrict lubrication or allow excessive fluid leakage.
Innovation Solution
The proposed seal geometry features an annular main body with radially inwardly extending lips, where the first and second lips slope in one direction and the third lip in another, allowing fluid flow past the innermost lips to reduce wear and preventing inward contamination, while the fourth lip directs fluid flow to prevent leakage during high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the seal geometry allows fluid flow under the lips for lubrication, then wear is minimized, but fluid loss increases during high temperature operations
Solution Approach 1:
The seal employs multiple lips with different orientations (first and second lips sloping in one direction, third lip sloping in another direction) to create localized sealing zones with different functions. This allows fluid to flow under certain lips for lubrication while other lips prevent excessive fluid loss, resolving the contradiction between wear prevention and fluid retention.
2Loss of substance
If the seal prevents fluid loss during high temperature operations, then fluid retention is improved, but wear on seal lips increases due to restricted fluid flow
Solution Approach 1:
The seal design changes the orientation parameters of different lips relative to the trunnion surface. By varying the slope directions of different lips, the seal creates optimized fluid flow paths that balance fluid retention with adequate lubrication flow to the sealing surfaces, reducing wear while maintaining fluid retention.
3Loss of substance
If the seal geometry restricts fluid flow to prevent leakage, then fluid loss is minimized, but lubrication of seal lips is insufficient leading to accelerated wear
Solution Approach 1:
The seal is segmented into multiple lips with different orientations rather than a single sealing element. This segmentation allows different portions of the seal to perform different functions: some lips restrict fluid loss while others facilitate lubrication flow, collectively improving both fluid retention and seal durability.
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
This configuration effectively maintains fluid flow to the seal lips, minimizes wear, and prevents fluid loss and contamination, even under high temperature conditions, by allowing fluid to flow past the innermost lips and directing the fourth lip to prevent outward leakage.
Implementation Method 1
trace amounts of fluid to flow under the lips of the seal, thereby improving the lubrication of the lips
Implementation Method 2
the contact pressure of the lips against the trunnions is relieved as pressure builds up within the joint
Data Source
AI summary
A seal for sealing between a trunnion and bearing cup of a joint member includes a main annular body. A plurality of annular lips extend radially inwardly from the main body. The lips are configured for engaging an outer bearing surface of the trunnion. A first one and a second one of the lips slope in a first direction with respect to the outer bearing surface of the trunnion and a third one of the lips slope in a second direction with respect to the outer bearing surface of the trunnion.