Torque Transmission Apparatus with Dynamic Damper Frequency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing torque transmission apparatuses with vibration damping functions are ineffective in damping vibrations across a wide range of excitation frequencies due to their simple design, which limits their ability to address rotational fluctuations in engines.
Innovation Solution
A torque transmission apparatus with an intermediate member, first and second elastic members, an inertial body connected through a third elastic member, and an elastic member supporter that applies an initial load to the third elastic member, allowing for expandability and contractibility, enhancing damping performance across a broader range of engine speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the auxiliary mass body is connected to the main mass body through the third elastic member in a simple configuration, then the device complexity is reduced, but the vibration damping effect is limited to only the vicinity of excitation frequencies corresponding to the set frequency of the dynamic damper
Solution Approach 1:
The elastic member supporter is configured to be movable in the radial direction, allowing the third elastic member to change its support position dynamically. This enables the damper frequency to vary with engine rotational speed, expanding the effective damping range across different excitation frequencies while maintaining a relatively simple overall structure.
Solution Approach 2:
The spring constant of the third elastic member is changed by altering its support position on the elastic member supporter. As the support position moves radially, the effective length and stiffness of the third elastic member change, thereby adjusting the damper frequency to match different excitation frequencies at various engine speeds.
2Adaptability or versatility
If the spring constant of the third elastic member is fixed, then the manufacturing precision is simplified, but the damper frequency cannot adapt to varying excitation frequencies across different engine speeds
Solution Approach 1:
Instead of using a variable spring constant mechanism, the patent employs a dynamic support position system where the elastic member supporter can move radially. This allows the effective spring constant to be adjusted by changing the support position rather than changing the physical spring constant of the third elastic member itself, simplifying manufacturing while achieving adaptability.
Solution Approach 2:
The elastic member supporter acts as an intermediary between the third elastic member and the housing. By positioning this intermediary at different radial locations, the effective stiffness of the third elastic member is modified without requiring the third elastic member itself to be complex or variable, thus maintaining manufacturing simplicity while achieving frequency adaptation.
3Reliability
If the lock-up clutch is vibrated at excitation frequency dependent on engine rotational speed, then the operation reflects real engine conditions, but the vibration damping effect is insufficient because the excitation frequency is not constant
Solution Approach 1:
The elastic member supporter is designed to move in the radial direction in response to centrifugal force generated by engine rotation. As engine speed increases, the supporter moves outward, changing the support position of the third elastic member and thereby adjusting the damper frequency to track the increasing excitation frequency, ensuring continuous effective damping across the operating range.
Solution Approach 2:
The physical parameters of the damping system are changed dynamically through the movement of the elastic member supporter. The support position of the third elastic member varies with engine speed, which changes the effective spring constant and thus the damper frequency, allowing the system to maintain optimal damping performance across varying excitation frequencies.
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 ensures effective vibration damping across a wide range of engine speeds by varying the apparent spring constant and damper frequency, thereby improving damping performance and reducing torsional vibrations.
Implementation Method 1
a third elastic member (7) connected to the intermediate member (3)
Implementation Method 2
the elastic member supporter (8) supports the third elastic member (7) in a manner of applying an initial load to the third elastic member (7)
Implementation Method 3
an inertial body (6) connected to the intermediate member (3) through the third elastic member (7)
Data Source
AI summary
A torque transmission apparatus including an intermediate member disposed in a power transmission path between a first rotor and second rotor; a first elastic member interposed between the first rotor and the intermediate member; a second elastic member interposed between the intermediate member and the second rotor; an inertial body connected to the intermediate member through a third elastic member; and an elastic member supporter supporting the third elastic member to be expandable and contractible. The elastic member supporter supports the third elastic member in a manner of applying an initial load to the third elastic member, in an initial state of the first and second rotors being non-rotating.