Sealing Apparatus Lip Member Spring Segmentation
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Solution Overview
Problem
Conventional sealing apparatuses face challenges in reducing friction resistance while maintaining sealing performance, especially under high temperature conditions where plastic deformation occurs, leading to a decline in sealing effectiveness due to the interdependence of reaction forces from the spring member.
Innovation Solution
The sealing apparatus features a lip member made of resin material with an annular shape and a spring member made of metal, with outer and inner periphery pressing portions arranged at equal angular intervals and having cutouts to allow for independent reaction forces, enhancing the spring member's ability to compensate for plastic deformation and reduce friction resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the spring member is designed with continuous pressing portions to maintain sealing performance, then sealing effectiveness is improved, but friction resistance increases and the ability to independently compensate for plastic deformation under high temperature deteriorates
Solution Approach 1:
The spring member is divided into multiple pressing portions (outer periphery pressing portion and inner periphery pressing portion) that are separated by a releasing portion. This segmentation allows each pressing portion to independently exert pressing force on the respective lips without the reaction forces being coupled, thereby reducing friction resistance while maintaining sealing performance through independent compensation of plastic deformation.
2Reliability
If the spring member uses a continuous structure to provide uniform pressing force, then sealing performance is maintained, but the ability to independently generate reaction forces for compensating plastic deformation under high temperature is reduced
Solution Approach 1:
The spring member is segmented into distinct pressing portions separated by a releasing portion, enabling each portion to generate independent reaction forces. This allows the outer periphery pressing portion and inner periphery pressing portion to independently adapt to and compensate for plastic deformation occurring at different locations under high temperature conditions.
Solution Approach 2:
The releasing portion is designed with flexible characteristics that allow it to dynamically adjust and transmit forces independently. This dynamic structure enables the pressing portions to respond independently to thermal expansion and plastic deformation, enhancing the adaptability of the sealing apparatus under varying temperature conditions.
3Reliability
If the pressing force is increased to compensate for plastic deformation under high temperature, then sealing performance is maintained, but friction resistance and wear on the lips increase
Solution Approach 1:
By segmenting the spring member into separate pressing portions, the pressing force is distributed more efficiently. Each pressing portion can apply the necessary force to maintain sealing without excessive overall compression, thereby reducing friction and wear on the lips while maintaining adequate sealing performance.
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 effectively reduces friction resistance while maintaining sealing performance by allowing the spring member to generate distinct reaction forces, preventing a decline in sealing effectiveness even under high temperature conditions.
Implementation Method 1
even when plastic deformation (settling) occurs in the lip member 101 due to high temperature thus reducing the interference, the spring member 102 presses the lip member 101 and hence, sealing performance of the sealing apparatus 100 is maintained
Implementation Method 2
the outer-periphery-side lip 105 comes into close contact with the opening 112 of the housing 111, the inner-periphery-side lip 106 comes into close contact with the shaft 113
Data Source
AI summary
A sealing apparatus includes an annular lip member made of a resin material, and an annular spring member made of a metal material. The lip member includes a lip base portion, an outer-periphery-side lip, and an inner-periphery-side lip. The spring member includes: a spring base portion having an annular shape about an axis; an outer periphery pressing portion for pressing the outer-periphery-side lip; and an inner periphery pressing portion for pressing the inner-periphery-side lip. The spring member is accommodated in an accommodating groove. The outer periphery pressing portion includes a plurality of outer periphery pressing pieces, and the inner periphery pressing portion includes a plurality of inner periphery pressing pieces. The outer periphery pressing piece has a cutout extending along the axis without reaching a high-pressure-side edge of the outer periphery pressing piece, and the inner periphery pressing piece has a cutout extending along the axis without reaching a high-pressure-side edge of the inner periphery pressing piece.