EPDM Torsional Damper Structure for Rubber Heat Control
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Solution Overview
Problem
Conventional torsional dampers experience rubber ring breakage due to excessive heat generation, which is not adequately addressed by existing designs.
Innovation Solution
A torsional damper design featuring a hub, an annular vibration ring with a larger inner diameter, and a rubber ring made of EPDM with a specific loss factor, where the rubber ring is compressed between the hub and vibration ring, with specific thickness and temperature constraints to minimize heat buildup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the rubber ring is made with higher loss factor to increase damping performance, then the torsional vibration reduction is improved, but the heat generation increases causing rubber ring breakage
Solution Approach 1:
The patent changes the material parameter by specifying EPDM rubber with a loss factor of 0.18 or more at 60±5°C, and controls the vibration ring thickness parameter within 1.6-9.0mm to achieve optimal balance between damping performance and heat generation. This resolves the contradiction by optimizing material and dimensional parameters simultaneously.
Solution Approach 2:
The patent uses a composite structure combining EPDM rubber material with specific metal components (hub and vibration ring). The EPDM rubber provides both the necessary damping properties and heat resistance when combined with the metal structure, resolving the contradiction between damping performance and temperature control.
2Strength
If the vibration ring thickness is increased to improve structural strength, then the durability is improved, but the heat dissipation capability decreases causing higher temperature
Solution Approach 1:
The patent optimizes the vibration ring thickness parameter within the specific range of 1.6-9.0mm. This parameter optimization ensures sufficient structural strength while maintaining adequate heat dissipation capability, resolving the contradiction between strength and temperature control.
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 design significantly reduces the likelihood of rubber ring breakage by maintaining lower surface temperatures, as evidenced by the provided mathematical formulas and experimental data.
Implementation Method 1
a rubber ring which is present in a compressed state between the outer peripheral surface of the hub and the inner peripheral surface of the vibration ring, which is made of a rubber composition primarily composed of EPDM, and which has a loss factor (tan δ) of 0.18 or more at a surface temperature of 60±5° C.
Implementation Method 2
When the torsional vibration of the crankshaft exceeds the resonance area or its vicinity, relative vibration in a torsional direction occurs between the hub and the vibration ring of the TVD, thus causing heat generation in the rubber ring of the TVD.
Data Source
AI summary
A torsional damper comprises: a hub fixed to a rotating shaft and having an outer peripheral surface on the circumference centered on the rotating shaft; an annular vibrating ring having an inner peripheral surface having a diameter larger than that of the outer peripheral surface of the hub, on the circumference centered on the rotation axis; and a rubber ring, composed of a rubber composition containing EPDM as a main component, provided in a compressed state between the outer peripheral surface of the hub and the inner peripheral surface of the vibrating ring, and has a loss coefficient of 0.18 or more when the surface temperature is 60±5° C., wherein when the rubber ring is subjected to the resonance point tracking method, the maximum surface reaching temperature of the rubber ring at the time of continuous vibration at the resonance point and the vibration ring thickness satisfy a specific relational expression.