Catalyst Support Symmetrical Slit Thermal Stress
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Catalyst supports in internal combustion engine exhaust systems experience uneven thermal stress distribution, which can lead to damage due to asymmetrical slits not aligned with the central axis, causing uneven stress reduction and potential cracking.
Innovation Solution
A catalyst device with a slit orthogonal to the central axis, symmetric with respect to an arbitrary plane, is implemented to evenly distribute thermal stress reduction across the catalyst support, preventing damage from thermal stress and incorporating a cross-sectional area that withstands insertion loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If an asymmetrical slit is provided in the catalyst support, then thermal stress is reduced in certain areas, but uneven thermal stress distribution occurs in the radial direction causing damage to the catalyst support
Solution Approach 1:
The patent applies asymmetry in reverse by enforcing symmetry. The slit is configured to be symmetrical with respect to at least one plane passing through the central axis of the catalyst support. This symmetrical arrangement ensures that thermal stress is distributed evenly across the radial direction, preventing the uneven stress distribution that would occur with an asymmetrical slit configuration, thereby maintaining catalyst support integrity while still reducing overall thermal stress.
2Stress or pressure
If a slit is arranged orthogonal to the central axis, then thermal stress distribution is improved, but the slit must be precisely symmetrical to avoid damage
Solution Approach 1:
The patent resolves this by defining the slit configuration to be symmetrical with respect to at least one plane passing through the central axis. This symmetrical design provides a clear manufacturing target and tolerance reference, making it easier to achieve consistent thermal stress distribution while maintaining catalyst support integrity. The symmetry requirement serves as a practical guide for manufacturing rather than an overly complex constraint.
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 symmetrical slit configuration reduces thermal stress uniformly, preventing damage from thermal deformation and ensuring the catalyst support's integrity during temperature gradients and insertion, while the conductor material's high thermal expansion is managed to prevent cracking.
Implementation Method 1
The slit reduces thermal stress that acts on the catalyst support. The symmetrical arrangement ensures even distribution of thermal stress reduction across the catalyst support, preventing damage from thermal deformation.
Implementation Method 2
the conductor material's high thermal expansion is managed to prevent cracking
Data Source
AI summary
A catalyst device includes a central axis and a catalyst support. The catalyst support includes a slit that is arranged to be orthogonal to the central axis. The slit is arranged to be symmetrical with respect to an arbitrary plane that includes the central axis.