Series Damper Layout for Low-Speed Vibration Control
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Solution Overview
Problem
Existing damper devices face challenges in maintaining vibration damping performance in the low rotation region while avoiding increased costs and reducing engagement rotation speed, as they often compromise on either cost or performance due to complex structures and additional parts.
Innovation Solution
The damper device configuration includes an input element, an intermediate element, and an output element, with specific elastic bodies disposed between them, where the ratio of the total moment of inertia of the output element to the sum of the output and differential gear moment of inertia is optimized between 0.12 and 0.5, ensuring effective resonance shifting and maintaining damping performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the moment of inertia of the turbine hub is increased to shift resonance to lower frequency, then the engagement rotation speed can be reduced, but the vibration damping performance in the low rotation region may deteriorate due to higher frequency resonance generation
Solution Approach 1:
The damper device is divided into multiple independent dampers (first damper, second damper, third damper) that operate in parallel. Each damper targets different frequency ranges, with the first damper handling low frequency resonance and the second and third dampers handling higher frequency resonance, thereby resolving the contradiction between shifting resonance frequency and maintaining damping performance across different rotation regions
Solution Approach 2:
Different dampers are designed with different characteristics tailored to specific frequency ranges. The first damper has parameters optimized for low frequency resonance, while the second and third dampers have parameters optimized for higher frequency resonance. This localized optimization allows each damper to effectively address specific resonance issues without compromising overall vibration damping performance
2Reliability
If multiple intermediate members and springs are added to decrease rigidity and improve vibration damping performance, then the damping performance is improved, but the device complexity and cost increase
Solution Approach 1:
Multiple dampers are combined into a single integrated damper device that functions as a unified system. The first, second, and third dampers work together in parallel to provide comprehensive vibration damping across different frequency ranges, achieving the performance benefits of multiple separate dampers while reducing overall structural complexity and cost compared to using multiple independent intermediate members and springs
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 shifts resonance to a lower frequency, decreases engagement rotation speed, and maintains vibration damping performance in the low rotation region without increasing cost, by optimizing the moment of inertia ratio and using a balanced design with series and parallel spring configurations.
Implementation Method 1
a first elastic body that transmits torque between the input member and an intermediate member, and a second elastic body that transmits torque between the intermediate member and the output member
Implementation Method 2
a damper device that attenuates vibration between a piston plate of the direct clutch and the turbine hub
Implementation Method 3
The turbine hub of the fluid transmission device includes a recessed portion in which a diameter is increased to fill a space between the turbine runner and the damper device and which is formed on the turbine runner side. The recessed portion of the turbine hub and the protruding portion of the turbine runner are coupled to each other by brazing and the turbine hub functions as an inertia mass body.
Data Source
AI summary
A damper device includes: an input element coupled to an engine via a clutch; an intermediate element; an output element coupled to an input shaft of a transmission; a first elastic body that is disposed between the input element and the intermediate element; and a second elastic body that is disposed between the intermediate element and the output element and that acts in series with the first elastic body. When a total moment of inertia of the output element and a rotation element that rotates integrally with the output element on the engine side with respect to the input shaft is J2, and a total moment of inertia of all rotation members included between the input shaft and a differential gear coupled to an output shaft of the transmission is JTM, 0.12≤J2/(J2+JTM)≤0.5 is satisfied.