Vehicle Damper Device Input-Side Dynamic Mass Torsional Resonance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional vehicle damper devices struggle to achieve a high damping effect for torsional resonance in drive systems without increasing vibration transmission sensitivity in the high frequency range, particularly due to the placement of dynamic dampers on the output-side members with smaller inertial mass, leading to ineffective absorption of vibration energy during resonance.
Innovation Solution
A vehicle damper device is designed with a mass body and first elastic member coupled to the input-side rotating member, which has a larger inertial mass, and a second elastic member between the input and output-side rotating members, allowing for effective vibration energy absorption during torsional resonance without increasing high-frequency vibration transmission sensitivity. The damper includes a torque limiter mechanism and a friction mechanism to enhance damping and prevent excessive torque transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the dynamic damper is disposed on the output-side member with smaller inertial mass, then the device complexity is reduced, but the damping effect is insufficient because the vibration energy absorption is small
Solution Approach 1:
The patent inverts the conventional placement of the dynamic damper from the output-side member to the input-side rotating member. This inversion allows the damper to utilize the larger inertial mass of the input-side member, thereby significantly improving vibration energy absorption and damping effect while maintaining structural simplicity
2Reliability
If the spring stiffness is increased to increase the natural frequency of the drive system, then the torsional resonance is suppressed, but the vibration transmission sensitivity is increased in the high frequency range
Solution Approach 1:
The patent changes the placement location parameter of the dynamic damper from output-side to input-side, and adjusts the spring stiffness parameter to achieve optimal damping effect. By positioning the damper on the input-side rotating member with larger inertial mass, the system achieves effective torsional resonance suppression while maintaining appropriate vibration transmission characteristics in the high frequency range
3Reliability
If the hysteresis torque is increased to suppress the torsional resonance, then the damping effect is improved, but the vibration transmission sensitivity is increased in the high frequency range
Solution Approach 1:
The patent optimizes the hysteresis torque parameter by positioning the friction mechanism on the input-side rotating member. This placement allows the friction mechanism to effectively counteract torsional resonance while maintaining controlled vibration transmission in the high frequency range, avoiding the adverse effects of excessive hysteresis torque
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 solution effectively increases the damping effect during torsional resonance while maintaining low vibration transmission sensitivity in the high frequency range, reducing engine booming noise and gear rattle noise, and providing robust and stable torsional characteristics.
Implementation Method 1
a first elastic member interposed between the input rotating member and the mass body, the first elastic member operatively coupling the input-side rotating member and the mass body while elastically deforming depending on a relative rotation amount between the input-side rotating member and the mass body
Implementation Method 2
a second elastic member interposed between the input-side rotating member and the output-side rotating member, the second elastic member operatively coupling the input-side rotating member and the output-side rotating member while elastically deforming depending on a relative rotation amount between the input-side rotating member and the output-side rotating member
Implementation Method 3
the inertia member and the second coil spring act as a dynamic damper. Therefore, if torsional resonance occurs in a drive system, vibration energy thereof is absorbed by the dynamic damper
Data Source
AI summary
A vehicle damper device disposed between a power transmission member coupled to an output shaft of an engine and a power transmission shaft disposed concentrically and rotatably relative to the power transmission member, the vehicle damper device includes: an input-side rotating member to which power of the engine is input via the power transmission member; an output-side rotating member relatively non-rotatably coupled to the power transmission shaft to be concentric and rotatable relative to the input-side rotating member; a mass body disposed rotatably relative to the input-side rotating member; a first elastic member interposed between the input-side rotating member and the mass body; and a second elastic member interposed between the input-side rotating member and the output-side rotating member.