Nested Torsional Vibration Damper With Torque Limiter for Low Inertia
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Solution Overview
Problem
Existing torsional vibration dampers in drive trains experience increased wear on helical compression springs due to torque fluctuations, leading to performance deterioration and potential breakage, especially in electrified systems, and require a solution that mitigates torsional vibrations and torque excess while minimizing installation space and mass moment of inertia.
Innovation Solution
A torsional vibration damper with a multi-flange design, incorporating a torque limiter unit and an outer hub, where the torque limiter is arranged radially inside the damper, reducing the load on the multi-flange damper and featuring a low mass moment of inertia on the transmission side, with components like helical compression springs and centrifugal pendulums to manage torque fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a multi-flange damper is used to reduce wear on helical compression springs, then the durability is improved, but the mass moment of inertia increases
Solution Approach 1:
The torque limiter unit is nested radially inside the multi-flange damper structure. The outer hub connects the multi-flange damper to the torque limiter unit, with the torque limiter unit positioned within the radial space of the damper. This nesting arrangement allows both components to occupy the same radial envelope, reducing the overall mass moment of inertia while maintaining the durability benefits of the multi-flange design.
2Volume of moving object
If the torque limiter unit is arranged radially inside the multi-flange damper, then the installation space is reduced, but the structural complexity increases
Solution Approach 1:
The outer hub serves as a unified connection component that integrates both the multi-flange damper and the torque limiter unit. The outer hub has an external toothing that engages with the flanges and an internal toothing that receives the torque limiter unit, merging two separate torque transmission paths into a single structural element. This reduces installation space while managing structural complexity through functional integration.
Solution Approach 2:
The outer hub performs multiple functions: it connects the multi-flange damper to the torque limiter unit, transmits torque through external and internal toothing engagement, and provides radial support for both components. This multi-functionality reduces the need for additional separate components, thereby reducing installation space without proportionally increasing structural complexity.
3Productivity
If the outer hub connects both the multi-flange damper and torque limiter unit, then the torque transmission efficiency is improved, but the manufacturing complexity increases
Solution Approach 1:
The outer hub is designed with distinct functional zones: an external toothing portion that engages with the multi-flange damper flanges and an internal toothing portion that receives the torque limiter unit. This segmentation of functional regions allows for specialized manufacturing of each toothing type while maintaining them as a single integrated component, improving torque transmission efficiency through optimized engagement surfaces.
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 proposed damper effectively mitigates torsional vibrations and torque excess, reduces wear, and maintains a compact design with low mass moment of inertia, ensuring durability and efficient torque management in drive trains.
Implementation Method 1
a multi-flange damper having a plurality of flanges for damping torsional vibrations depending on the push torque and pull torque
Implementation Method 2
The outer hub has an external toothing which is in engagement with the flanges of the multi-flange damper in a manner that alternates depending on the push torque and pull torque
Implementation Method 3
components like helical compression springs and centrifugal pendulums to manage torque fluctuations
Data Source
AI summary
A torsional vibration damper for a drive train includes an axis of rotation, a multi-flange damper for damping torsional vibrations, a torque limiter unit for limiting a maximum transmissible torque, an outer hub connecting the multi-flange damper to the torque limiter unit for torque transmission, and an inner hub for connection to a transmission input shaft. The multi-flange damper has a plurality of flanges. The torque limiter unit is arranged radially inside the multi-flange damper and includes an inner plate and an outer plate. The outer hub is arranged radially between the multi-flange damper and the torque limiter unit and the inner hub is arranged radially inside the torque limiter unit. The outer hub includes an external toothing engaged with each of the plurality of flanges and an internal toothing engaged with the outer plate.