Chevron Seal Gasket Structure for Stable Shaft Assembly
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Solution Overview
Problem
Existing gaskets with a tapered cylindrical lip-type seal portion are prone to deformation during assembly, leading to the seal portion falling off the intended seal surface, necessitating reassembly and increased man-hours.
Innovation Solution
A gasket design featuring a protruding seal portion with a stable chevron cross-section and a reinforcing ring, allowing easy assembly by minimizing deformation and ensuring the seal portion remains in the intended position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a tapered cylindrical lip-type seal portion is used, then the seal portion can contact the outer peripheral surface of the shaft member, but the seal portion is easily deformed during insertion and may fall off the seal surface
Solution Approach 1:
The seal portion is divided into multiple segments along the insertion direction, with each segment capable of independent elastic deformation. This segmentation allows the seal portion to flexibly adapt to the annular gap during assembly while maintaining its overall structural integrity and preventing detachment from the seal surface.
Solution Approach 2:
The seal portion transitions from a rigid tapered cylindrical structure to a dynamic elastic structure that can deform during insertion and then recover its shape. This dynamic behavior enables the seal portion to navigate the assembly process without permanent deformation while ensuring reliable contact with the shaft member's outer peripheral surface.
2Stability of the object's composition
If the seal portion is made elastic to prevent deformation, then the seal portion can maintain its shape, but the assembly process becomes more complex requiring additional positioning structures
Solution Approach 1:
Different portions of the gasket are assigned different properties: the main body portion is made rigid for structural support and easy assembly, while the seal portion is made elastic for shape stability during contact. This local differentiation of material properties achieves both assembly ease and shape stability without requiring complex additional structures.
Solution Approach 2:
The gasket employs asymmetric structural design where the seal portion has a different cross-sectional geometry and material property compared to the main body portion. This asymmetry allows the seal portion to exhibit elastic behavior for shape stability while the main body remains simple and easy to assemble.
Data Source
AI summary
A gasket is provided that can be easily assembled into an annular gap. The gasket is inserted from one end side toward the other end side of a shaft member into an annular gap between a housing and a shaft member at least partially inserted into the housing. The gasket includes a cylindrical main body portion inserted into the housing and fixed to the housing, and a seal portion extending from an inner peripheral surface of the main body portion and abutting on an outer peripheral surface of the shaft member. The seal portion is composed of a protrusion extending in the entire circumferential direction and protruding inward in the radial direction at an intermediate portion in the insertion direction in the inner peripheral surface of the main body portion.