Radial Shaft Seal Grease Ring for Reliable Air Leak Testing
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Solution Overview
Problem
Shaft seals often fail air leakage tests due to uneven distribution of grease, leading to incorrect error messages despite correct installation, as the grease applied to the seal section redistributes unfavorably during installation, causing air leaks even when the seal material is not inherently air-tight.
Innovation Solution
Applying the grease ring axially adjacent to the free end of the seal section on the mounting sleeve ensures uniform distribution between the seal section and the shaft during installation, ensuring a reliable seal and passing air leakage tests.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If grease is applied onto the seal section before installation, then the seal section can be lubricated for installation, but the grease redistributes unfavorably during installation causing air leakage test failures
Solution Approach 1:
The grease application is segmented into two distinct components: a grease ring applied to the mounting sleeve and seal grease applied to the seal section. This segmentation allows each component to serve its specific function without interfering with the other, preventing the unfavorable redistribution that occurs when only seal section greasing is used.
Solution Approach 2:
The grease ring acts as an intermediary element between the seal section and the shaft. It provides a controlled grease transfer mechanism that ensures uniform distribution of lubrication during installation, mediating the interaction between the seal section and shaft to prevent air leakage while maintaining installation ease.
2Adaptability or versatility
If the seal element is not comprised of air-tight material, then the seal section can be more flexible and easier to install, but it fails to seal the region between the seal section and the shaft
Solution Approach 1:
The grease ring serves as an intermediary sealing element that compensates for the non-air-tight nature of the seal section material. It provides the necessary sealing action in the region between the seal section and shaft, allowing the seal element to remain flexible while ensuring reliable sealing.
Solution Approach 2:
Different sealing qualities are applied to different regions: the seal section maintains flexibility for installation and contact with the mounting sleeve, while the grease ring provides localized air-tight sealing at the interface between the seal section and shaft. This local differentiation of sealing quality resolves the contradiction between flexibility and sealing reliability.
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 method ensures a reliable air seal by uniformly distributing the grease between the seal section and the shaft, facilitating proper installation and passing air leakage tests, even when the seal material is not inherently air-tight.
Implementation Method 1
a seal element (16) that is deformable in an elastic manner and has a seal section (18) which under elastic deformation contacts the outer side (28) of the mounting sleeve (21)
Implementation Method 2
the seal section on the shaft is pushed in such a way onto the grease ring that the grease of the grease ring is distributed between the seal section and the shaft
Data Source
AI summary
A shaft seal, in particular a radial shaft seal, has a seal element that is provided with a seal section that under elastic deformation contacts the outer side of a mounting sleeve. The shaft seal has a grease ring located on the mounting sleeve wherein the grease ring is arranged axially adjacent to the free end of the seal section on the mounting sleeve. For installation, grease ring and seal section are pushed by a mounting tool onto the shaft and the seal section on the shaft is pushed onto the grease ring in such a way that the grease of the grease ring is distributed between the seal section and the shaft.