Multi-Ring Seal Structure for High-Pressure Line Contact
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Solution Overview
Problem
Existing seal structures, particularly in internal combustion engines, face challenges in achieving high sealing properties with easy processing methods, as they often rely on single-stage lip sealing with limited contact points, which can lead to inefficiencies in sealing performance.
Innovation Solution
A seal structure featuring an annular seal member with a plurality of ring-shaped parts that overlap in the axial direction, forming a quadrangular cross-section, which slopes relative to the radial direction, providing multiple contact points close to line contact with the inner peripheral wall member, enhancing sealing efficiency and allowing for easier manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single-stage lip sealing structure is used, then the structure is simple and easy to manufacture, but the sealing property is insufficient
Solution Approach 1:
The outer periphery of the annular seal member is divided into multiple ring-shaped parts that overlap in the axial direction. This segmentation creates multiple contact points with the inner peripheral wall member, transforming a single-stage seal into a multi-stage sealing system that achieves higher sealing reliability without requiring a completely different structural approach
Solution Approach 2:
The ring-shaped parts are arranged to overlap in the axial direction, utilizing the third dimension (axial direction) to create multiple contact points. This dimensional arrangement allows the seal to achieve line contact sealing at multiple axial positions simultaneously, improving sealing performance while maintaining a compact single-stage structure
2Reliability
If multiple contact points are formed to improve sealing, then the sealing property improves, but the processing difficulty increases
Solution Approach 1:
The outer periphery is segmented into multiple ring-shaped parts that can be formed using standard machining operations. Each ring-shaped part can be processed independently or as part of a unified structure, allowing flexible manufacturing approaches that balance sealing performance with processing ease
Solution Approach 2:
The ring-shaped parts have curved geometries that naturally conform to cylindrical surfaces, facilitating easier machining and assembly compared to complex angular or irregular shapes. The curved surfaces of the ring-shaped parts align with the cylindrical inner peripheral wall, simplifying the manufacturing process while achieving the desired multiple contact points
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 achieves high sealing properties by creating multiple contact points with high contact pressure, facilitating easy deformation and effective sealing, while also simplifying the manufacturing process and improving the scraping of contaminants from the inner wall.
Implementation Method 1
By installing the seal ring in a ring groove by causing to elastically deform so that both lateral surfaces thereof become conical surfaces
Implementation Method 2
the corner of the inner peripheral surface of the seal ring and the bottom surface of the seal groove make line contact, and the corner of the outer peripheral surface of the seal ring and the inner peripheral surface of the cylinder make line contact
Data Source
AI summary
This seal structure 1 is provided with an annular seal member 2, a shaft member 4 having a seal groove 5 where the inner peripheral side of said seal member 2 is arranged, and an inner peripheral wall member 6 which has an internal space surrounded by an inner peripheral wall 61, wherein the shaft member 4 is arranged in the internal space 62, and the annular seal member 2 is arranged in the seal groove 5 of the shaft member 4. The side of the outer periphery 21 of the annular seal member 2 is formed by overlapping, in the axial direction D1, a plurality of ring-shape parts 3 which are closed or unclosed when viewed in a radial direction D2; when viewed in the radial direction D2, on one side of a center axis C1 of the annular seal member 2, in a longitudinal cross-section of the plurality of ring-shape parts 3, one corner 32 of the two corners of the edge 31 facing the inner peripheral wall 61 of the inner peripheral wall member 6 contacts the inner peripheral wall 61 of the inner peripheral wall member 6.