Dynamic Damper Nonlinear Torsion Torque Variation
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Solution Overview
Problem
Existing fluid power transmission devices with dynamic dampers face instability in attenuation performance due to varying friction resistance and rotation speed-dependent lock mechanisms, leading to complications in achieving high attenuation performance across normal rotation speed ranges.
Innovation Solution
A fluid power transmission device with a dynamic damper featuring a base plate, inertia unit, and elastic unit that exhibits nonlinear torsional characteristics, where the elastic unit has different stiffness in distinct torsion ranges, and is pre-compressed to elastically deform at specific torsional torque levels, effectively attenuating rotational speed variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dynamic damper with friction generating mechanism is used to attenuate torque variation, then attenuation performance is improved, but friction resistance varies with time causing unstable performance
Solution Approach 1:
The patent removes the friction generating mechanism from the dynamic damper, extracting the source of unstable friction resistance. The dynamic damper is redesigned to function purely as an inertia unit without any friction-based attenuation components, thereby eliminating the problem of varying friction resistance while maintaining attenuation performance through inertial effects alone.
Solution Approach 2:
The patent replaces the friction-based attenuation mechanism with an inertia-based attenuation mechanism. Instead of using friction resistance to dampen torque variations, the system relies on the inertial properties of the dynamic damper's rotating mass to attenuate torque variations, providing stable and predictable attenuation performance.
2Reliability
If a lock mechanism is used to restrict dynamic damper activation at desired rotation speeds, then attenuation performance is enhanced in specific ranges, but rotation speed variability makes it difficult to stabilize performance
Solution Approach 1:
The patent removes the lock mechanism entirely from the system, extracting the source of rotation speed dependency. The dynamic damper is allowed to operate continuously across all rotation speeds without mechanical restriction, and the inertial attenuation mechanism naturally provides effective damping across the entire operating range without requiring speed-dependent control.
Solution Approach 2:
The patent employs a dynamic inertial attenuation mechanism that automatically adapts to varying rotation speeds. The dynamic damper's inertial properties provide rotation speed-proportional attenuation, where the attenuation effect naturally varies with operating conditions without requiring active control or lock mechanisms, achieving stable performance across the full rotation speed range.
3Reliability
If a damper mechanism is installed on the output side of the dynamic damper to inhibit high rotation speed peaks, then attenuation performance is improved, but device construction becomes complicated
Solution Approach 1:
The patent merges the dynamic damper and the attenuation mechanism into a single integrated unit. The dynamic damper itself is designed to provide attenuation across all rotation speeds including high speed ranges, eliminating the need for separate downstream damper mechanisms and simplifying the overall construction while maintaining comprehensive attenuation performance.
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 device achieves stable high attenuation performance across the entire normal rotation speed range with a simple construction by shifting peak torque variations to higher rotation speeds, thereby enhancing transmission stability.
Implementation Method 1
The elastic unit exerts nonlinear torsional characteristics, and elastically couples the base plate and the inertia unit in the rotational direction
Implementation Method 2
The elastic unit exerts nonlinear torsional characteristics, and elastically couples the base plate and the inertia unit in the rotational direction
Implementation Method 3
The inertia unit is movable relatively to the base plate in a rotational direction
Implementation Method 4
The fluid coupling body includes a turbine and is configured to transmit the power from the engine to the transmission through the fluid
Data Source
AI summary
A torque converter includes a torque converter body, a lock-up device, and a dynamic damper. The lock-up device includes an output plate coupled to a turbine. The dynamic damper is fixed to the output plate of the lock-up device, and is configured to attenuate variation in speed of rotation from the engine. The dynamic damper includes a base plate, an inertia unit, and an elastic unit. The base plate is fixed to the output plate. The inertia unit is movable relative to the base plate in a rotational direction. The elastic unit exerts nonlinear torsional characteristics, and elastically couples the base plate and the inertia unit in the rotational direction.