Groove-Mounted Gasket Structure for Easier Insertion and Retention
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Solution Overview
Problem
The existing gasket design, where the second portion contacts both side surfaces of the groove, leads to hindered insertion due to the repulsive force of sealed air, making it difficult to improve attachability.
Innovation Solution
The gasket features an annular body with first and second protrusion pairs that extend over the entire circumferential direction, with the second protrusion pair's tip ends formed in a planar shape to contact the groove sides, ensuring a smaller first gasket width and a larger second gasket width than the groove width.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the second portion contacts both side surfaces of the groove over the entire circumference, then the gasket is restrained from falling off the groove, but air in the groove is sealed by the gasket and insertion of the gasket into the groove is hindered by the repulsive force of the sealed air
Solution Approach 1:
The gasket is segmented into multiple portions: a first portion that contacts the bottom surface of the groove, and a second portion that protrudes toward the side surfaces. This segmentation allows different regions to perform different functions - the first portion provides sealing contact while the second portion provides retention, preventing the need for continuous circumferential contact that would seal air and hinder insertion.
Solution Approach 2:
Different portions of the gasket are designed with different contact characteristics. The first portion has a width equal to or less than the groove width to contact the bottom surface, while the second portion has a width greater than the groove width to contact the side surfaces. This local differentiation allows the gasket to provide both retention and avoid complete air sealing during insertion.
2Stability of the object's composition
If the width of the gasket in the second portion is the same as the groove width, then the second portion contacts both side surfaces of the groove to prevent falling off, but this creates repulsive force from sealed air that hinders insertion
Solution Approach 1:
The gasket is designed with elastic properties that allow it to dynamically adjust its width during insertion. When inserted, the gasket elastically deforms to fit into the groove, with the second portion contacting the side surfaces only after insertion, rather than maintaining constant contact that would seal air and create insertion resistance.
Data Source
AI summary
A gasket (1) includes a body portion (10) in an annular shape having a basal surface (11) to contact a bottom surface (113) of a groove(110) and a top surface (12) to contact a second member (200) and extending over an entire circumferential direction of the gasket (1), a first protrusion pair (20) protruding from the body portion (10) respectively toward both side surfaces (111, 112) of the groove (110) and extending over the entire circumferential direction; and a second protrusion pair (30) protruding from the first protrusion pair (20) respectively toward both the side surfaces (111, 112). Respective second protrusions (31, 32) of the second protrusion pair (30) are disposed at a same position in the circumferential direction, and tip ends (31f, 32f) of the respective second protrusions (31, 32) are formed in a planar shape to be along the side surfaces of the groove (110). A first gasket width (W1) of the gasket (1) is smaller than a groove width (W0), and a second gasket width (W2) is larger than the groove width (W0).