Rectilinear Wire Cable Vibration Isolator for Exhaust Systems
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Solution Overview
Problem
Existing vibration isolators for motor vehicle exhaust systems using wire cable pieces are complex in structure and manufacture, lack sufficient axial rigidity, and are not suitable for use between the engine block and exhaust manifold or catalytic converter, while also failing to accommodate thermal expansions effectively.
Innovation Solution
A vibration isolator with rectilinear wire cable pieces connected between mounting plates, providing high axial rigidity to damp engine vibrations and allowing thermal expansion by being flexible in a perpendicular plane, with a wire cable piece ratio of free length to diameter less than fifteen for reduced material usage and enhanced damping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If wire cable pieces are used to connect mounting plates in existing vibration isolators, then the isolator can accommodate thermal expansion, but the axial rigidity is insufficient and the structure becomes complex
Solution Approach 1:
The patent changes the geometric parameters of the wire cable piece, specifically setting the ratio of free length to diameter less than fifteen, to achieve both high axial rigidity for vibration damping and sufficient flexibility for thermal expansion accommodation
Solution Approach 2:
The wire cable piece is configured to extend rectilinearly between mounting plates in a specific orientation, using spatial arrangement to achieve both rigidity in the axial direction and flexibility in perpendicular directions for thermal expansion
2Reliability
If wire cable pieces with high axial flexibility are used to absorb vibrations, then vibration isolation is improved, but the rigidity in the main vibration direction deteriorates
Solution Approach 1:
The patent optimizes the geometric parameters of the wire cable piece, specifically the ratio of free length to diameter less than fifteen, to achieve the optimal balance between vibration isolation and axial rigidity
Solution Approach 2:
The wire cable piece is designed to exhibit dynamic characteristics, being rigid in the axial vibration direction to damp vibrations while remaining flexible in perpendicular directions to accommodate thermal and operational movements
3Adaptability or versatility
If complex wire cable configurations are used in existing vibration isolators, then thermal expansion is accommodated, but the device complexity increases
Solution Approach 1:
The patent extracts and eliminates unnecessary complex structural elements from existing vibration isolators, retaining only the essential wire cable piece with optimized parameters to achieve both thermal expansion accommodation and simplicity
Solution Approach 2:
The wire cable piece is designed to perform multiple functions simultaneously: it provides vibration damping through axial rigidity, accommodates thermal expansion through perpendicular flexibility, and simplifies the overall structure by replacing complex multi-component assemblies
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 solution effectively dampens axial vibrations from the engine block, preventing their transmission to the exhaust system while allowing thermal expansion of the exhaust manifold, ensuring simple installation and reduced material costs.
Implementation Method 1
providing high axial rigidity to damp engine vibrations
Implementation Method 2
allowing thermal expansion by being flexible in a perpendicular plane
Data Source
AI summary
A method of using a vibration isolator comprising a first mounting plate and a second mounting plate, and at least one wire cable piece which is connected both to the first mounting plate and to the second mounting plate. The at least one wire cable piece is connected to the two mounting plates in such a way that it extends rectilinearly between the two mounting plates and has a high rigidity in the axial direction as a result of which the resonant frequency is pushed out of the main range of frequency generated by an engine block and further having a low rigidity in the direction of a plane perpendicularly with respect to the axial direction.