Low-Spring-Constant Gasket for Sealing and Vibration Isolation
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Solution Overview
Problem
Current gaskets, while providing high sealability, lack effective vibration-damping and anti-vibration characteristics, which are essential for applications in environmentally friendly vehicles and devices that generate vibrations.
Innovation Solution
A gasket with an elastic part made of rubber having a dynamic spring constant of 1.5 g/μm or lower, combined with a metal sheet, where the rubber is nitrile rubber with a hardness of 90 or lower, enhancing its vibration-damping and anti-vibration properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rubber and metal are laminated to form a gasket, then sealability is improved, but vibration-damping characteristics are insufficient
Solution Approach 1:
The patent changes the physical parameter of the rubber material by controlling its dynamic spring constant to be 1.5 g/μm or lower (measured at 23±2°C, 100 Hz, and 0.1% strain amplitude). This parameter change optimizes the rubber's vibration-damping capability while preserving its sealing function in the laminated gasket structure.
Solution Approach 2:
The patent uses a composite material system consisting of rubber and metal sheets laminated together. The rubber component with specifically controlled dynamic spring constant properties provides vibration-damping functionality, while the metal sheets maintain structural integrity and sealing capability, creating a multi-functional composite gasket.
2Reliability
If rubber hardness is increased to improve compression set resistance, then sealability is improved, but vibration-damping characteristics deteriorate
Solution Approach 1:
The patent identifies and controls the dynamic spring constant as the critical parameter for vibration-damping performance. By setting this parameter to 1.5 g/μm or lower, the patent achieves optimal vibration-damping characteristics. The hardness is separately controlled to be 90 or lower to balance compression set resistance with vibration-damping, demonstrating independent optimization of multiple material parameters.
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 effectively reduces vibration and noise transmission, improving low-noise characteristics in devices such as motors and inverter cases, and can be used in various machines and vehicles for comfortable operation.
Implementation Method 1
damping of vibration to be generated in those environmentally friendly automobiles has been demanded
Implementation Method 2
an elastic part containing a rubber having a dynamic spring constant of 1.5 g/μm or lower
Data Source
AI summary
A gasket includes an elastic part containing a rubber having a dynamic spring constant of 1.5 g/μm or lower as measured under conditions of 23±2° C., 100 Hz, and a strain amplitude of 0.1% according to JIS K6394:2007.