Damper Device Stiffness Differentiation Resonance Control
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Solution Overview
Problem
Existing damper devices experience increased vibration levels due to resonance of intermediate elements, particularly at low engine rotation speeds, leading to significant vibration transmission to downstream components.
Innovation Solution
The damper device incorporates a higher stiffness third elastic body to increase the resonance frequency of intermediate elements, allowing resonance between these elements only at higher engine speeds, thereby reducing overall vibration levels and transmission of large vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If multiple intermediate elements are arranged between elastic members to increase torsional angle, then the stroke is increased, but resonance occurs at low rotation speeds causing increased vibration transmission
Solution Approach 1:
The patent applies parameter changes by differentiating the stiffness values of different elastic members. Specifically, the third elastic body is designed with higher stiffness than the second elastic body, which changes the dynamic characteristics of the system. This stiffness differentiation modifies the resonance behavior of intermediate elements, shifting resonance to occur at higher rotation speeds where engine torque is lower, thereby reducing harmful vibration transmission while preserving the increased torsional angle capability
2Power
If intermediate elements are arranged between elastic members, then power transmission is achieved, but resonance frequency matches low engine speeds causing amplified vibrations
Solution Approach 1:
The patent applies local quality by assigning different stiffness characteristics to different positions in the power transmission chain. The third elastic body (closer to the output) has higher stiffness while the second elastic body (closer to the input) has lower stiffness. This localized differentiation of mechanical properties allows power transmission through multiple intermediate elements while controlling where resonance occurs, preventing vibration amplification at problematic engine speeds
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
This configuration effectively suppresses vibration increases from intermediate element resonance, improving vibration damping characteristics and reducing vibration transmission to downstream components, especially during low engine speed operations.
Implementation Method 1
the resonance frequency of the first intermediate element and second intermediate element is increased by setting the stiffness of the third elastic body so as to be relatively high, so it is possible to cause resonance between the first intermediate element and the second intermediate element when the rotation speed of the input element is relatively high
Implementation Method 2
a first elastic body to which power is transmitted from the input element; a first intermediate element to which power is transmitted from the first elastic body
Data Source
AI summary
A damper device including an input element to which power from a motor is transmitted; a first elastic body to which power is transmitted from the input element; a first intermediate element to which power is transmitted from the first elastic body; a second elastic body to which power is transmitted from the first intermediate element; a second intermediate element to which power is transmitted from the second elastic body; a third elastic body to which power is transmitted from the second intermediate element; and an output element to which power is transmitted from the third elastic body. A stiffness of the third elastic body is higher than a stiffness of the second elastic body.