Multi-stage Spiral Spring Shock Absorber for Exhaust Vibration Damping
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Solution Overview
Problem
Conventional cushioning devices for attaching heat insulators to vibrating exhaust manifolds suffer from vibration transmission issues, leading to noise generation due to the resonance of the heat insulator, which compromises their vibration-damping properties.
Innovation Solution
A cushioning device featuring a multi-stage coiled and spiral spring structure, where the spiral portion has a lower spring constant and the coiled portion has a higher spring constant, allowing for effective vibration absorption and transmission suppression without noise, utilizing a grommet and collar member with specific geometries to enhance vibration-damping properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gap is provided between the collar member and cushioning member to suppress vibration transmission, then vibration-damping property is improved, but rattling noise is generated due to collision
Solution Approach 1:
The cushioning member acts as an intermediary element between the collar member and the heat insulator. It absorbs vibration energy through elastic deformation and prevents direct collision between the collar member and heat insulator, thereby eliminating rattling noise while maintaining vibration-damping performance.
Solution Approach 2:
The invention changes the physical state of the cushioning member from a rigid structure to an elastic deformable structure. By utilizing the elastic properties of the cushioning member, it can dynamically adjust its shape during vibration, absorbing energy and preventing collision-induced noise while maintaining the gap for vibration isolation.
2Reliability
If the cushioning member is made loosely movable inside the collar member to suppress vibration input, then vibration transmission is reduced, but the cushioning member vibrates and collides against the collar member
Solution Approach 1:
The cushioning member serves as a mediator that is intentionally designed to be loosely movable within the collar member. This loose fit allows the cushioning member to absorb vibration inputs through elastic deformation and movement, preventing direct transmission of vibration to the heat insulator while avoiding rigid collisions.
Solution Approach 2:
The invention introduces dynamic behavior to the cushioning member, allowing it to move and deform elastically in response to vibration inputs. This dynamic response enables the cushioning member to adapt to vibration conditions, absorbing energy through controlled movement rather than rigid collision, thus suppressing vibration transmission without generating noise.
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 device provides stable and superior vibration-damping performance, reducing noise and heat transmission, while simplifying assembly and reducing component count, and is suitable for various applications including internal combustion engines and exhaust systems.
Implementation Method 1
a cushioning member for cushioning the vibration... The cushioning member is formed of a wiring member having a spiral shape as seen in a plan view... At least a part of the spiral shape as seen in a plan view of the cushioning member has a high spring portion having a spring constant higher than that of another portion
Implementation Method 2
The vibration transmitted from the collar member 10 to the cushioning member 8 causes the cushioning member 8 itself to make a flexural motion. Owing this flexural motion, the cushioning device 5 converts the vibration energy of the vibration transmitted from the collar member 10 into a kinetic energy of the flexure of the cushioning member 8
Data Source
Figure 1
Figure 2A~2B
Figure 3
AI summary
The present invention has an object of providing a cushioning device having a stable and superb vibration-damping property and a metal cover attachable by use of the cushioning device. A cushioning device 10, which is to be located between a bolt boss 41 provided on an exhaust manifold 1 as a vibration source and a heat insulator 3 as a connection target and connects the bolt boss 41 provided on the exhaust manifold 1 and the heat insulator 3 to each other and cushions transmission of a vibration from the bolt boss 41 provided on the exhaust manifold 1 to the heat insulator 3, includes a multi-stage coiled and spiral spring 50 for cushioning the vibration, a grommet 20 for joining the multi-stage coiled and spiral spring 50 and the heat insulator 3 to each other, and a collar member 30 located between an attaching bolt 42 tightened to the bolt boss 41 provided on the exhaust manifold 1 and the multi-stage coiled and spiral spring 50. The multi-stage coiled and spiral spring 50 is formed of a wiring member having a spiral shape as seen in a plan view.