Damper Disc Assembly Axial Sub Damper Noise Attenuation
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Solution Overview
Problem
Existing damper disc assemblies face limitations in widening the low torsion angular range, which restricts the attenuation of noises in idling and the transmission of required torque, due to space constraints and stiffness requirements for both low and high torsion ranges.
Innovation Solution
A damper disc assembly with first and second low stiffness damper units and a high stiffness damper unit, actuated in specific torsion ranges to widen the low torsion angular range and provide high torque, while maintaining appropriate hysteresis torque generation mechanisms for noise and vibration attenuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the sub damper unit is disposed laterally to the flange to widen the low torsion angular range, then noises in idling can be effectively inhibited, but the circumferential space for disposing the sub damper unit is small, imposing a limitation on widening the low torsion angular range
Solution Approach 1:
The patent transitions from lateral (circumferential) arrangement to axial arrangement of the sub damper unit. By disposing the sub damper unit axially between the first input plate and the input-side member, the invention utilizes the axial dimension instead of the limited circumferential space, thereby enabling effective widening of the low torsion angular range while accommodating space constraints.
2Object-affected harmful factors
If the sub damper unit is disposed laterally to the flange, then the low torsion angular range can be widened, but chances are that a torque required in idling mainly performed in the low torsion angular range cannot be obtained depending on the specifications of vehicles
Solution Approach 1:
The patent divides the damper system into multiple independent damper units: a main damper unit and a sub damper unit. Each unit can be independently configured with appropriate stiffness characteristics. The sub damper unit disposed axially provides low stiffness for widening the low torsion angular range, while the main damper unit provides high stiffness for torque transmission, allowing both noise attenuation and torque requirements to be satisfied simultaneously.
Solution Approach 2:
Different regions of the damper system are assigned different stiffness properties. The sub damper unit located axially between the first input plate and input-side member has low stiffness to enable wide low torsion angular range for noise inhibition, while the main damper unit has high stiffness for torque transmission. This local differentiation of mechanical properties resolves the contradiction between noise attenuation and torque transmission.
3Object-affected harmful factors
If a low stiffness damper unit is configured to be actuated in the low torsion angular range, then noises in idling can be attenuated, but the torsional stiffness in the high torsion angular range must be maintained high to countermeasure tip-in/tip-out
Solution Approach 1:
The damper system is segmented into a main damper unit and a sub damper unit with different stiffness characteristics. The sub damper unit is configured with low stiffness and actuated in the low torsion angular range to attenuate noises in idling. The main damper unit maintains high stiffness and acts in the high torsion angular range to countermeasure tip-in/tip-out vibrations. This segmentation allows independent optimization of stiffness characteristics for different operating conditions.
Solution Approach 2:
The system exhibits dynamic stiffness characteristics through the interaction of multiple damper units. In the low torsion angular range, the sub damper unit is actuated providing low overall stiffness for noise attenuation. In the high torsion angular range, the main damper unit becomes active providing high stiffness for vibration suppression. The system dynamically transitions between different stiffness states based on the torsion angular range.
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 attenuates noises in idling and vibrations by widening the low torsion angular range and achieving high torque transmission, improving the overall performance of the damper disc assembly.
Implementation Method 1
The first low stiffness damper unit elastically couples the input-side member and the output-side member in a rotational direction
Implementation Method 2
The second low stiffness damper unit elastically couples the input-side member and the output-side member in a rotational direction
Implementation Method 3
The high stiffness damper unit elastically couples the input-side member and the first and second input plates in a rotational direction
Data Source
AI summary
A damper disc assembly includes first and second input plates, an output unit, a high stiffness damper unit, and first and second low stiffness damper units. The output unit includes an input-side member and an output-side member disposed rotatably relative to each other. The high stiffness damper unit elastically couples the input-side member and the first and second input plates in a rotational direction and is actuated in a high torsion angular range of torsional characteristics. The first and second low stiffness damper units elastically couple the input-side member and the output-side member and are actuated in a low torsion angular range of the torsional characteristics. The second low stiffness damper unit is actuated later than actuation of the first low stiffness damper unit.