Selective Elastic Coating on Full-Bead Metal Gaskets for Sealing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Prior-art metal gaskets with elastic coatings on both sides of a full bead face issues with coating collection at the recessed surface, leading to insufficient compression and sealing gaps between counterpart members.
Innovation Solution
Forming an elastic coating on the entire protruding surface of the full bead and excluding it from the bottom section to the intermediate section of the recessed surface, ensuring sufficient compression and sealing properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If elastic coating is formed on both surfaces of the full bead, then sealing function is improved by covering the full bead, but coating material collects in the bottom part of the recessed surface forming thick coating collection that interferes with compression
Solution Approach 1:
The patent applies elastic coating selectively to specific regions of the full bead rather than uniformly across all surfaces. The coating is applied to the protruding surface and upper portions of the recessed surface, but deliberately excluded from the bottom part of the recessed surface where coating collection would occur. This local differentiation allows the coating to provide sealing enhancement where needed while preventing harmful coating accumulation that would interfere with compression.
2Quantity of substance
If thick coating collection is formed in the bottom part of the recessed surface, then coating coverage is improved, but the full bead compression amount becomes insufficient and gaps form between counterpart members
Solution Approach 1:
The patent extracts or removes the elastic coating from the specific region where it would cause problems - the bottom part of the recessed surface. By creating a coating-free zone in this critical area, the patent prevents coating material from accumulating and interfering with the compression process, while still maintaining adequate coating coverage on other surfaces for sealing purposes.
3Reliability
If elastic coating is formed on the full bead, then sealing properties are enhanced, but material cost increases due to additional coating material
Solution Approach 1:
The patent reduces material cost by applying elastic coating only to specific regions where it provides sealing benefit, rather than coating the entire full bead surface. The selective application to the protruding surface and upper recessed surface areas minimizes coating material consumption 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 allows for improved sealing by preventing coating collection at the recessed surface, ensuring full compression of the full bead and reducing material costs through optimized coating application.
Implementation Method 1
a full bead is formed by bending so as to form a mountain-shaped protruding surface on one side in a thickness direction
Implementation Method 2
both surfaces of the metal substrate 101 on which the full bead 100c is formed is generally coated (after-coat) with elastic coating 102 made of rubber-state elastic material
Data Source
AI summary
A metal gasket which enables improvement of sealing properties by making sufficient compression of a full bead possible even if elastic coating is formed along the full bead. In the gasket (1) having a full bead (13), formed on a metal substrate (10), having a mountain-shaped protruding surface formed on one side in a thickness direction and a valley-shaped recessed surface formed on the other side in the thickness direction, elastic coating (20) is formed on the whole surface of the protruding surface of the full bead (13), and the elastic coating (20) is formed on the recessed surface of the full bead (13), except a slit-shaped elastic coating-free section (14) along a bottom section (13a) of the recessed surface.