Damper Disk Assembly with Independent Hysteresis Torque Control
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Solution Overview
Problem
Conventional damper mechanisms struggle to adjust hysteresis torque effectively due to shared urging members for low and high friction generating mechanisms, leading to difficulties in managing torsional vibrations, especially from engine combustion fluctuations.
Innovation Solution
A damper disk assembly with a pair of plate-like rotating members, an elastic member, and a friction plate that operates between them, allowing the friction plate to rotate relative to the third plate-like member during small torsional vibrations, preventing friction generation and enabling independent adjustment of hysteresis torque between low and high friction mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a shared urging member is used for both low and high friction generating mechanisms, then the structure is simplified, but the hysteresis torque cannot be adjusted independently for each mechanism
Solution Approach 1:
The patent divides the urging force application into separate pathways by introducing a reaction plate. The first urging member applies force to the first friction generating mechanism, while the second urging member applies force to the second friction generating mechanism through the reaction plate. This segmentation allows independent adjustment of hysteresis torque for each friction mechanism while maintaining structural efficiency.
2Reliability
If the friction generating mechanism operates during small torsional vibrations, then hysteresis torque is generated to damp vibrations, but excessive friction is generated causing energy loss
Solution Approach 1:
The patent applies different friction characteristics to different operational conditions by designing two distinct friction generating mechanisms with different friction coefficients. The first friction generating mechanism has a lower friction coefficient for small vibrations, while the second has a higher friction coefficient for large vibrations. This local differentiation of friction properties allows optimal energy dissipation across different vibration amplitudes without excessive energy loss.
3Reliability
If low hysteresis torque is used in the second stage, then small torsional vibrations are effectively damped, but the mechanism cannot handle large torsional vibrations from tip-in and tip-out
Solution Approach 1:
The patent creates a dynamic friction generation system where the second friction generating mechanism is designed to engage only when the torsional angle exceeds a predetermined threshold. During small vibrations, only the first friction mechanism operates with low hysteresis torque. When large vibrations occur, the second mechanism activates to provide additional hysteresis torque. This dynamic engagement strategy allows the system to adapt its damping characteristics to the vibration amplitude.
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 damps small torsional vibrations without generating excessive friction, allowing for superior torsional vibration absorption and damping characteristics.
Implementation Method 1
The elastic member elastically couples the pair of first and second plate-like rotating members and the third plate-like rotating member in a rotational direction
Implementation Method 2
The friction plate frictionally engages with the pair of first and second plate-like rotating members
Data Source
AI summary
To accomplish a superior characteristic for absorbing and damping torsional vibrations in a damper disk assembly and a flywheel assembly. A damper disk assembly includes a pair of plates 11 and 12, a flange 20, coil springs 16 and 17, and friction plates 58 and 59. The pair of plates 11 and 12 is fixed to each other. The flange 20 is disposed between the pair of plates 11 and 12 in the axial direction. The coil springs 16 and 17 elastically couple the pair of plates 11, 12 and flange 20 in the rotational direction. The friction plates 58 and 59 are disposed to operate in parallel with the coil springs 16 and 17 between the pair of plates 11, 12 and the flange 20 in the rotational direction, frictionally engage with the pair of plates 11 and 12, and engage with the flange 20 to be relatively rotatable in only range of the small torsional angle.