Bead Gasket Structure for Low Fastening Force and Corrosion Control
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Solution Overview
Problem
Conventional gaskets used in vehicles and general-purpose machines require high fastening forces due to the reaction forces exerted when the gaskets are sandwiched between members, leading to potential deterioration of sealing performance under corrosive conditions from salty water and snow melting agents.
Innovation Solution
The gasket design features a metal base plate with a bead portion, inner periphery portion, and outer periphery portion, where the outer periphery portion extends obliquely and the inner periphery portion is symmetrically formed relative to the bead portion, covered by an elastic body. This configuration reduces the reaction force and minimizes the accumulation of corrosive substances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the gasket is sandwiched between members to seal the housing, then the sealing function is improved, but the reaction force increases requiring high fastening forces
Solution Approach 1:
The gasket is divided into multiple functional regions: a bead portion for primary sealing contact, an inner periphery portion for inner sealing, and an outer periphery portion for outer sealing. This segmentation allows each region to contribute differently to the sealing function, distributing the sealing load and reducing the peak reaction force that would otherwise require high fastening forces.
Solution Approach 2:
Different portions of the gasket have different structural characteristics optimized for their specific functions. The bead portion has high elasticity for initial sealing, while the periphery portions have extended geometries for distributing sealing pressure. This local quality differentiation enables effective sealing with reduced overall reaction force.
2Reliability
If the members are tightly fastened to improve sealing, then the sealing function is improved, but the corrosion resistance deteriorates due to accumulation of corrosive substances
Solution Approach 1:
The extended inner periphery and outer periphery portions extract and contain corrosive substances within sealed regions, preventing them from reaching and corroding the members. By taking out the corrosive substances from the general environment and confining them to specific zones, the members are protected from corrosion while maintaining effective sealing.
Solution Approach 2:
The periphery portions of the gasket act as intermediary barriers between the sealing interface and the members. These extended portions intercept corrosive substances before they can reach the members, serving as a protective mediator that allows tight fastening for sealing without the associated corrosion risk.
3Ease of manufacture
If the gasket structure is simplified to reduce manufacturing complexity, then the ease of manufacture is improved, but the ability to suppress corrosion deteriorates
Solution Approach 1:
The gasket is formed as a single integrated piece that simultaneously performs multiple functions: sealing through the bead portion, corrosion prevention through the extended periphery portions, and structural support. This multi-functionality in a single component achieves corrosion suppression without significantly increasing manufacturing complexity, as the extended portions are naturally formed during gasket manufacturing.
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 gasket achieves reduced reaction forces and enhanced sealing performance by minimizing the space for corrosive substances to accumulate, thereby preventing corrosion and maintaining the sealing integrity even under corrosive conditions.
Implementation Method 1
The gasket goes through elastic-plastic deformation in a state of being compressively sandwiched between a pair of members
Data Source
AI summary
A gasket is provided to reduce a reaction force in an attached state and suppress deterioration of sealing performance due to a corrosive foreign matter such as salty water and a snow melting agent. A gasket includes a metal base plate made of metal, and a covering layer formed of an elastic body that covers at least a part of the metal base plate. The metal base plate includes a pair of an upper face and a lower face that are back-to-back to each other, a bead portion protruding toward a side facing the upper face, an inner periphery portion extending from an inner periphery edge of the bead portion, and an outer periphery portion extending from an outer periphery edge of the bead portion. The outer periphery portion extends toward a side facing the lower face, in an oblique manner with respect to a protruding direction of the bead portion.