Damper Device Stiffness Gradient for Resonance Suppression
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Solution Overview
Problem
Existing damper devices experience increased vibration levels due to resonance of intermediate elements, which are not effectively addressed by current technologies, leading to significant vibration transmission to downstream components.
Innovation Solution
The damper device incorporates a design where the stiffness of the first elastic body is higher than the second elastic body, allowing for increased resonance frequency between the first and second intermediate elements at high motor rotation speeds, while the third elastic body, with lower stiffness, reduces the overall resonance frequency and enhances vibration damping characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If multiple intermediate elements are arranged in the damper device to increase torsional angle, then the stroke is increased, but resonance occurs between intermediate elements at low rotation speeds causing increased vibration transmission
Solution Approach 1:
The patent applies parameter changes by setting specific stiffness values for different elastic bodies to control resonance frequencies. The first elastic body has higher stiffness than the second elastic body, which raises the resonance frequency of intermediate elements above the engine's maximum rotation speed, eliminating resonance-induced vibration while preserving the increased torsional angle functionality
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 transmission to downstream components by managing resonance frequencies and improving vibration damping, allowing for smoother operation and reduced noise during lockup events.
Implementation Method 1
a first elastic body to which power is transmitted from the input element
Implementation Method 2
a second elastic body to which power is transmitted from the first intermediate element
Implementation Method 3
a third elastic body to which power is transmitted from the second intermediate element
Implementation Method 4
the resonance frequency of the first intermediate element and second intermediate element is increased... so it is possible to cause resonance between the first intermediate element and the second intermediate element when the rotation speed of input element is relatively high
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 first elastic body is higher than a stiffness of the second elastic body.