Shaft Seal Structure With Inclined Lip for Eccentricity and Noise Control
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Solution Overview
Problem
Steering dust seals fail to maintain a sealed space effectively over a long period, leading to sound transmission and potential gaps when the rotational shaft is eccentric, due to inadequate design in existing structures.
Innovation Solution
A sealing device with a sound insulation ring and a circular annular sound insulation lip, where the sound insulation ring is inclined and includes a protruding wall, allowing the lip to slide smoothly and maintain contact, preventing the formation of gaps and ensuring continuous sealing even when the shaft is eccentric.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the sound insulation lip is made to slide on the sound insulation ring to accommodate shaft eccentricity, then the sealed space can adapt to shaft movement, but the sliding contact may cause increased friction and potential separation over time
Solution Approach 1:
The sound insulation lip is designed as a dynamic component that can slide laterally along the inclined circular annular part of the sound insulation ring. This sliding mechanism allows the sealing structure to adapt to shaft eccentricity while maintaining continuous contact through the inclined surface geometry, preventing separation and ensuring long-term reliability of the sealed space.
Solution Approach 2:
The circular annular part of the sound insulation ring is designed with an inclined surface relative to the axial direction. This geometric parameter change creates a gradual transition zone that reduces sliding resistance and ensures the sound insulation lip remains in contact with the ring even when the shaft becomes eccentric, thereby maintaining the sealed space.
2Stability of the object's composition
If the sound insulation lip is constrained to prevent excessive lateral movement, then the sealed space stability is improved, but the ability to accommodate shaft eccentricity is reduced
Solution Approach 1:
The sound insulation lip is designed with controlled mobility rather than rigid constraint. It can slide laterally along the inclined circular annular part to accommodate shaft eccentricity, but the inclined geometry and contact design prevent excessive movement, thereby maintaining both adaptability and stability of the sealed space.
3Adaptability or versatility
If the sound insulation lip is made flexible to follow shaft movement, then adaptability to eccentricity is improved, but the risk of folding and improper orientation increases
Solution Approach 1:
The sound insulation lip is designed as a dynamic component that slides along a guided path defined by the inclined circular annular part. This controlled movement allows the lip to follow shaft eccentricity while the inclined surface geometry prevents folding and ensures proper orientation is maintained throughout the sliding motion.
Solution Approach 2:
The inclined circular annular part of the sound insulation ring acts as an intermediary element between the sound insulation lip and the shaft eccentricity. It provides a guided sliding path that accommodates shaft movement while preventing improper folding or orientation of the lip through its geometric constraints.
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 a sealed space for sound attenuation over a long period by reducing sliding resistance and preventing excessive lateral movement, ensuring the sound insulation lip remains in contact with the sound insulation ring, thus preventing the opening of the sealed space.
Implementation Method 1
the sound insulation lip moves laterally following the rotational shaft... the distal end of the sound insulation lip can be permanently in contact with the circular annular part of the sound insulation ring
Data Source
AI summary
A sealing device seals a gap between a housing and a rotational shaft located in a shaft hole provided in the housing. The sealing device includes: a mounted part that is to be mounted on the shaft hole; an inner annular part; a seal lip that is to be in contact with the outer peripheral surface of the rotational shaft; a bellows part connecting the mounted part with the inner annular part; a sound insulation ring fixed to the mounted part; and a circular annular sound insulation lip projecting from the inner annular part or the bellows part toward the sound insulation ring. The sound insulation lip protrudes obliquely radially outward. The sound insulation ring includes a circular annular part with which the distal end of the sound insulation lip is in contact. The circular annular part of the sound insulation ring is inclined with respect to an axial direction of the shaft hole such that the distance between an outer portion of the circular annular part and the inner annular part when projected in the axial direction of the shaft hole is greater than the distance between an inner portion of the circular annular part and the inner annular part when projected in the axial direction.