Variable-Hysteresis Torque Transmission for Start-Up Vibration Control
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Solution Overview
Problem
Existing torque transmission devices in vehicles fail to adapt their hysteresis amounts to varying vehicle working conditions, leading to inadequate vibration attenuation and dynamic response sensitivity.
Innovation Solution
A torque transmission device with a first and second hysteresis assembly that adjusts hysteresis amounts based on the relative position of the torque input and output assemblies, allowing for different hysteresis roles in different working states to meet vehicle requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single hysteresis assembly is used in the torque transmission device, then the structure is simple, but the device cannot adapt to different vehicle working conditions with varying hysteresis requirements
Solution Approach 1:
The torque transmission device is divided into multiple hysteresis assemblies (first hysteresis assembly and second hysteresis assembly), each capable of independently providing hysteresis torque. This segmentation allows the system to adapt to different working conditions by selectively engaging different assemblies, resolving the contradiction between adaptability and structural simplicity.
Solution Approach 2:
The hysteresis assemblies are designed to dynamically engage or disengage based on the working conditions. The first hysteresis assembly can be selectively connected or disconnected from the torque transmission path, allowing the device to adjust its hysteresis characteristics in real-time, thus achieving adaptability without permanent structural complexity.
2Object-affected harmful factors
If a large hysteresis amount is used to attenuate torque fluctuations during vehicle start-up, then vibration attenuation is improved, but dynamic response sensitivity deteriorates
Solution Approach 1:
The device dynamically adjusts the hysteresis amount by selectively engaging different hysteresis assemblies based on operating conditions. During vehicle start-up with large torque fluctuations, the first hysteresis assembly is engaged to provide large hysteresis for vibration attenuation. During normal operation, the first assembly is disconnected to reduce hysteresis and improve dynamic response sensitivity, thus resolving the contradiction.
Solution Approach 2:
The hysteresis assemblies are periodically engaged or disengaged according to the vehicle's working conditions. The system transitions between different hysteresis states (large hysteresis during start-up, small hysteresis during normal operation) based on periodic assessment of torque fluctuation requirements, allowing the system to optimize performance for each operational phase.
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 effectively attenuates torque fluctuations during vehicle start-up and improves dynamic response sensitivity by varying hysteresis, enhancing ride comfort and performance.
Implementation Method 1
a first hysteresis assembly arranged to retard the relative rotation between the torque input assembly and the torque output assembly by means of friction
Implementation Method 2
a torque transmission device which has different hysteresis amounts under different working conditions
Data Source
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AI summary
The present disclosure relates to a torque transmission device, comprising: a torque input assembly and a torque output assembly arranged around an axis of rotation (X), and a first hysteresis assembly and a second hysteresis assembly arranged to retard a relative rotation between the torque input assembly and the torque output assembly by means of friction, the first hysteresis assembly having a first hysteresis amount H1, and the second hysteresis assembly having a second hysteresis amount H2. When the torque input assembly is in a negative position, the relative rotation between the torque input assembly and the torque output assembly is subjected to a total hysteresis amount H=H1+H2; when the torque input assembly is in a positive position, only the second hysteresis assembly plays a hysteresis role, and the relative rotation between the torque input assembly and the torque output assembly (120) is subjected to a total hysteresis amount H=H2. The present disclosure further relates to a transmission assembly comprising the above-mentioned torque transmission device and a vehicle comprising such a transmission assembly.