Bearing Seal Structure With Segmented Elastic Members for Leak Control
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Solution Overview
Problem
Existing sealing devices for bearings, particularly those with low rotating speeds or large diameters, suffer from lubricant leakage and difficulty in maintaining tight contact due to uneven radial force distribution, leading to poor sealing performance.
Innovation Solution
A sealing device comprising a framework, a sealing component, and multiple elastic members distributed circumferentially, with the elastic members applying an elastic force to the sealing component to ensure tight contact with the bearing ring, and featuring oil-pumping grooves and additional lips for enhanced sealing and protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single spring is used to apply radial force to the sealing component, then the structure is simple, but the radial force is unevenly distributed in the circumferential direction leading to poor sealing performance
Solution Approach 1:
The single spring is divided into multiple elastic members (at least two, preferably three or more) that are distributed at intervals in the circumferential direction. Each elastic member independently applies radial elastic force to the sealing component, ensuring uniform force distribution around the circumference and improving sealing reliability while maintaining reasonable structural complexity.
2Power
If the bearing diameter is increased for high-power applications, then the power capacity increases, but the centrifugal force becomes excessively large making it difficult to maintain tight contact between the sealing component and the inner ring
Solution Approach 1:
The elastic members are designed to be flexible and deformable, allowing them to dynamically adapt to the centrifugal forces generated during bearing operation. The elastic deformation of these members compensates for the outward centrifugal force on large-diameter bearings, maintaining continuous contact pressure between the sealing component and the inner ring surface regardless of rotation speed.
3Reliability
If the sealing component is pressed tightly against the inner ring to prevent leakage, then the sealing effect improves, but the elastic members experience excessive stress and wear reducing their service life
Solution Approach 1:
The elastic members are designed with optimized material properties and geometric parameters (cross-sectional area, length, curvature) to achieve the required contact pressure with appropriate elastic modulus. This allows the sealing component to maintain tight contact for effective sealing while the elastic members operate within safe stress limits, preventing premature fatigue failure and extending service life.
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 sealing device provides reliable sealing for bearings with larger diameters, effectively preventing lubricant leakage and external contaminants while maintaining contact integrity, even under high centrifugal forces.
Implementation Method 1
the elastic members are used for applying an elastic force to the sealing component such that the sealing component is pressed against the second ring
Implementation Method 2
The spring S3 is a spiral spring, and the spring is connected to the sealing component S2 and applies a force towards a radial inner side to the sealing component S2
Data Source
AI summary
A sealing device of a bearing. The sealing device includes a framework, a sealing component and a plurality of elastic members, wherein the framework and the sealing component are both annular and connected to each other, and the framework is configured to be fixed to a first ring of a bearing. The sealing component is configured to abut against a second ring of the bearing the plurality of elastic members are distributed at intervals in the circumferential direction of the sealing component, and the elastic members are used for applying an elastic force to the sealing component such that the sealing component is pressed against the second ring. A bearing is also provided.