Exhaust Purification Mat Geometry for Press-Fit Sealing Stability
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Solution Overview
Problem
Existing mat materials for exhaust gas treatment units are prone to deformation and sticking out from the casing during press-fitting, leading to instability and potential exhaust gas leakage.
Innovation Solution
A mat material design with specific ratios of non-recessed portion lengths in the width and longitudinal directions, combined with protrusions and recesses, and the use of inorganic and organic binders to enhance frictional resistance and adhesion, preventing deformation during press-fitting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mat material with protrusions and recesses is used to prevent exhaust gas leakage, then the sealing performance is improved, but the mat material is prone to deformation and sticking out during press-fitting
Solution Approach 1:
The patent applies parameter changes by optimizing the ratio of the width to length of non-recessed portions to be 1.0 or more. This specific dimensional parameter adjustment prevents deformation during press-fitting while maintaining the sealing function of protrusions and recesses, resolving the contradiction between sealing performance and dimensional stability
Solution Approach 2:
The mat material uses a composite structure combining organic fibers with inorganic binders. This composite material approach enhances both the sealing capability through proper fiber arrangement and the dimensional stability during press-fitting through the rigidifying effect of inorganic binders
2Strength
If the mat material is press-fitted into the casing to secure the exhaust gas treatment unit, then the fixation strength is improved, but the mat material deforms and sticks out from the casing
Solution Approach 1:
The patent changes the dimensional parameters of non-recessed portions by setting their width-to-length ratio to 1.0 or more. This parameter optimization allows the mat material to maintain its shape during press-fitting while achieving sufficient fixation strength, preventing both deformation and sticking out
Solution Approach 2:
The design of non-recessed portions with specific dimensions acts as a preliminary cushioning structure that anticipates and prevents deformation during press-fitting. These portions are designed beforehand to absorb and distribute press-fitting forces, preventing the mat material from sticking out
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 mat material effectively prevents deformation and sticking out from the casing, ensuring stable installation and reducing exhaust gas leakage, with enhanced holding power and flexibility.
Implementation Method 1
the use of inorganic and organic binders to enhance frictional resistance and adhesion
Implementation Method 2
the use of inorganic and organic binders to enhance frictional resistance and adhesion
Data Source
AI summary
A mat material having a generally rectangular shape in a plan view, the mat material including inorganic fibers, wherein the mat material includes a first main surface and a second main surface opposite to each other in a thickness direction, a first end surface and a second end surface opposite to each other in a longitudinal direction that is a winding direction, and a first side surface and a second side surface opposite to each other in a width direction perpendicular to the thickness direction and the longitudinal direction, the mat material includes, on the first end surface, a protrusion designed to protrude toward the second end surface during winding of the mat material, and non-protruding portions provided at both sides of the protrusion in the width direction and designed not to protrude toward the second end surface during winding of the mat material, the mat material includes, on the second end surface, a recess designed to fit the shape of the protrusion on the first end surface during winding of the mat material, and non-recessed portions provided at both sides of the recess in the width direction and designed to fit the shapes of the non-protruding portions on the first end surface during winding of the mat material, and a ratio [D/C] of a length [D] of the non-recessed portion in the width direction to a length [C] of the non-recessed portion in the longitudinal direction is 1.0 or more.