Hub Bearing Seal Flange Structure to Prevent High-Load Gaps
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Solution Overview
Problem
Existing sealing devices in hub bearings face challenges in maintaining sealing under high loads, as minute gaps can form between the elastic flange portion and the inner member, leading to potential leakage of lubricant and ingress of foreign matter.
Innovation Solution
A sealing device with a second sealing member featuring a rigid sleeve and an elastic flange portion with an annular protrusion, where the protrusion has a cylindrical portion and inclined surfaces, ensuring close contact with the inner member even under increased pressure, preventing gap formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rigid flange portion and elastic flange portion are used in the sealing member, then the sealing capability is improved, but under high load conditions, gaps may form between the elastic flange portion and the inner member, compromising sealing reliability
Solution Approach 1:
The protrusion on the inner periphery of the elastic flange portion features a cylindrical portion with a specific length (0.05mm to 0.20mm) that provides enhanced local contact with the inner member. This localized structural modification ensures reliable sealing at the critical interface between the elastic flange portion and the inner member, preventing gap formation under high load conditions while maintaining the overall sealing capability of the device.
2Reliability
If the inner peripheral portion of the elastic flange portion is in close contact with the inner member, then sealing is ensured, but under increased pressure, gaps may still form, compromising the sealed interior space
Solution Approach 1:
The cylindrical portion of the protrusion is designed with a specific length parameter (0.05mm to 0.20mm) that optimizes the contact characteristics between the elastic flange portion and the inner member. This parameter modification ensures that under increased pressure conditions, the protrusion maintains sufficient contact pressure to prevent gap formation, thereby maintaining reliable sealing of the interior space throughout the operating pressure range.
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 solution effectively maintains sealing of the interior space by preventing gap creation between the elastic flange portion and the inner member, even under high pressure conditions, thus ensuring the integrity of the lubricant and preventing foreign matter ingress.
Implementation Method 1
a circular annular elastic flange portion made of an elastic material that adheres to the rigid flange portion
Implementation Method 2
the lip of the first sealing member being in slidable contact with the sleeve
Data Source
AI summary
A sealing device has a first sealing member and a second sealing member. The first sealing member has a cylindrical part mounted on an outer member, and a lip. The second sealing member has a sleeve into which an inner member is fitted, and a flange extending radially outward. The flange has a rigid flange portion connected to the sleeve, and a circular annular elastic flange portion that adheres to the rigid flange portion. An annular protrusion is formed on an inner periphery of the elastic flange portion, and is in contact with an outer peripheral surface of the inner member. In an initial state, the inner peripheral surface of the protrusion has a cylindrical portion having an inner diameter that is less than that of the sleeve. The cylindrical portion has a length of at least 0.15 mm in the initial state.