Corrosion-Resistant Gasket Structure for Saltwater Sealing Gaps
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Solution Overview
Problem
Conventional gaskets used in vehicles and general-purpose machines are prone to corrosion from salt water and snow melting agents, leading to reduced sealing performance, especially when made of aluminum alloys, as these materials have a high ionization tendency and are easily corroded by retained salt water or snow melting agents.
Innovation Solution
A gasket design featuring a pair of gasket members with metal plates coated on both surfaces with rubber layers, where the outer periphery portions increase in diameter and inner periphery portions decrease in diameter, reducing the gap between the gasket and the members, thereby minimizing the retention of salt water and snow melting agents and slowing down corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the gap between one member and the outer periphery portion of the gasket is decreased, then the speed at which the one member is corroded is reduced, but it becomes difficult to eliminate salt water retention completely
Solution Approach 1:
The gasket is divided into multiple functional portions: a base portion for sealing, an outer periphery portion that extends diagonally to reduce gaps, and an outer periphery side annular portion that further extends in the extension direction of the base portion. This segmentation allows each portion to address specific aspects of the corrosion problem independently.
Solution Approach 2:
The gasket structure extends in multiple directions: the outer periphery portion extends diagonally from the base portion, and the outer periphery side annular portion extends in the extension direction of the base portion. This multi-dimensional extension effectively reduces gaps between the gasket and the member without requiring complex three-dimensional structures.
2Weight of moving object
If aluminum alloy members are used for the housing, then weight is reduced, but corrosion resistance to salt water and snow melting agent deteriorates
Solution Approach 1:
The gasket acts as an intermediary element between the aluminum alloy members, preventing direct contact with salt water and snow melting agent. By reducing gaps through the extended outer periphery portions and annular portions, the gasket blocks corrosive substances from reaching the aluminum alloy members.
Solution Approach 2:
The gasket utilizes elastic body materials that can deform flexibly to fill gaps and maintain contact with the housing members. This flexible sealing structure effectively blocks corrosive substances while accommodating thermal expansion and contraction of the aluminum alloy members.
3Ease of manufacture
If the gasket structure is simplified, then manufacturing cost is reduced, but the ability to prevent salt water retention and corrosion deteriorates
Solution Approach 1:
The gasket is segmented into distinct functional portions (base portion, outer periphery portion, outer periphery side annular portion) that can be formed using standard molding techniques. This segmentation allows for optimized manufacturing processes while achieving the desired sealing performance and corrosion resistance.
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 proposed gasket design effectively reduces the corrosion rate of the members it presses against, maintaining the sealing performance by minimizing the retention of corrosive substances and preventing salt water and snow melting agents from entering the gap, thus extending the lifespan of the gasket and maintaining airtightness.
Implementation Method 1
A gasket is elastically deformed by being arranged in a compressed state between a pair of members that form a housing in combination, thereby sealing the pair of members and sealing the housing
Implementation Method 2
a film-shaped coating layer that covers at least a part of the metal plate and is formed of an elastic body
Data Source
AI summary
An upper gasket member includes an upper base portion of an annular flat plate, an upper outer periphery portion diagonally extending to an upper side from an outer periphery edge portion of the upper base portion, and an upper outer periphery side annular portion of an annular flat plate extending in an extension direction of the upper base portion from an outer periphery edge portion of the upper outer periphery portion. Further, a lower gasket member includes a lower base portion of an annular flat plate, a lower outer periphery portion diagonally extending to a lower side from an outer periphery edge portion of the lower base portion, and a lower outer periphery side annular portion of an annular flat plate extending in an extension direction of the lower base portion from an outer periphery edge portion of the lower outer periphery portion.