Spring Seat Stiffness for Torsional Vibration Damping
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Solution Overview
Problem
Conventional damper disk assemblies experience reduced effectiveness in dampening torsional vibrations due to low stiffness of spring seats, leading to increased frictional resistance and deformation under centrifugal force, which diminishes their ability to absorb and attenuate torsional vibrations.
Innovation Solution
The proposed solution involves a spring assembly with enhanced spring seats that incorporate reinforcing components and metal reinforcing plates, which increase the overall stiffness of the spring seats, reducing elastic deformation and frictional resistance, thereby improving the damper disk assembly's ability to dampen torsional vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the stiffness of spring seats is low, then the spring assembly can be more flexible and easier to manufacture, but the sliding component elastically deforms under centrifugal force, causing sliding over the support component and generating frictional resistance that diminishes torsional vibration damping ability
Solution Approach 1:
The spring seat is designed with non-uniform thickness, where the thickness varies in the radial direction. Specifically, the thickness is greater at certain locations (such as where the sliding component is positioned) to provide higher local stiffness and reduce elastic deformation under centrifugal force, while other areas maintain thinner sections for flexibility and ease of manufacture. This local variation in thickness optimizes both manufacturing ease and vibration damping reliability.
2Reliability
If the stiffness of spring seats is increased, then the ability to dampen torsional vibration is improved, but the device complexity increases due to additional reinforcing components
Solution Approach 1:
The reinforcing component is integrated into the spring seat as a single unified structure rather than being a separate assembly. The reinforcing component forms an integral part of the spring seat body, combining the functions of structural support and stiffness enhancement in one piece. This merging approach increases torsional vibration damping ability while minimizing device complexity by eliminating the need for separate reinforcing elements.
Solution Approach 2:
The spring seat is constructed using composite material structure, combining materials with different properties to achieve optimal balance between stiffness and manufacturability. The composite structure allows the spring seat to have high stiffness in specific directions (radially) while maintaining flexibility in other directions, thereby improving torsional vibration damping without proportionally increasing overall device complexity.
3Ease of manufacture
If the sliding component is made from plastic material, then the ease of manufacture is improved, but under strong centrifugal force the sliding component elastically deforms and slides over the support component, generating frictional resistance
Solution Approach 1:
The spring seat uses plastic material with locally varied thickness to compensate for the inherently lower strength of plastic compared to metal. By increasing the thickness at critical locations where the sliding component experiences high centrifugal force, the design maintains adequate strength and resistance to deformation while preserving the ease of manufacture associated with plastic injection molding. The non-uniform thickness distribution allows the plastic sliding component to withstand strong centrifugal forces without excessive elastic deformation or sliding.
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 increased stiffness of the spring seats results in improved torsional vibration attenuation and durability, with reduced sliding and wear, allowing for more effective absorption and damping of torsional vibrations while maintaining operational stability.
Implementation Method 1
the spring seats support a spring that absorbs and dampens torsional vibration
Implementation Method 2
torsional vibrations and the like
Implementation Method 3
since the coil springs are subjected to centrifugal force, when they are compressed they move to the outside in the radial direction
Implementation Method 4
strong frictional resistance is generated between the coil springs and the input rotor
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Second spring seats 62 each have a first support component 63, a second support component 64, and a pair of reinforcing components 65. The first support components 63 support the ends of second coil springs 61a in the rotational direction. The second support components 64 extend in the rotational direction from the first support components 63, and support the ends of the second coil springs 61a in the radial direction. The reinforcing components 65 link the first support components 63 and the second support components 64, and extend in the radial direction from the second support components 64.