Active Differential Clutch Separation for Torque Load Protection
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Solution Overview
Problem
Active differentials in motor vehicles experience high loads that reduce the lifespan of mechanical and electrical components due to large speed and torque differences between output shafts, leading to potential damage and reduced service life.
Innovation Solution
A separable clutch device in the active differential separates the distribution shaft from the planetary gear when predetermined limit values of speed or torque differences are exceeded, allowing for controlled torque distribution and reducing high loads on components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the active differential operates without a separable clutch device to maintain continuous torque distribution control, then the adaptability and torque distribution flexibility are improved, but the reliability and service life of components deteriorate due to excessive loads during high speed or torque difference conditions
Solution Approach 1:
The clutch device is segmented into separable coupling and decoupling components that can disconnect the distribution shaft from the planetary gear when limit values are exceeded. This segmentation allows the system to switch between active torque distribution mode and passive differential mode, protecting components from excessive loads while maintaining adaptability during normal operation
Solution Approach 2:
The clutch device dynamically transitions between connected and disconnected states based on real-time monitoring of speed and torque differences. This dynamic adaptation allows the system to optimize between continuous torque distribution control during normal operation and component protection during extreme conditions, resolving the contradiction between adaptability and reliability
2Power
If the distribution shaft operates at high speeds to achieve large torque differences between output shafts, then the torque distribution capability is improved, but the mechanical stress and potential damage to the distribution motor increase
Solution Approach 1:
The clutch device is designed with preliminary protective measures that detect approaching limit values of speed or torque differences and disconnect the distribution shaft from the planetary gear before excessive speeds are reached. This preliminary anti-action prevents mechanical stress and potential damage to the distribution motor while preserving the torque distribution capability during safe operating ranges
3Reliability
If the clutch device is designed to separate automatically when limit values are exceeded, then the reliability and component protection are improved, but the device complexity increases due to additional sensors and control mechanisms
Solution Approach 1:
The clutch device is designed as a self-service system that automatically monitors operating parameters through integrated sensors and actuates separation when predetermined limit values are exceeded. This self-service capability provides reliable component protection without requiring complex external control systems, resolving the contradiction between reliability and device complexity
Data Source
Figure 1~3
AI summary
An active differential for the controlled distribution of a drive torque generated by a drive motor to two output shafts includes a planetary gear train configured to couple the two drive shafts to a drive shaft of the drive motor, and a distributor motor including a distributor shaft. The distributor motor produces a torque, with a distribution of a drive torque to the two output shafts being dependent on the torque produced by the distributor motor. The distributor shaft and the planetary gear train are coupled by a coupling device which is configured to separate the distributor shaft from the planetary gear train when an operating parameter of the active differential exceeds a predetermined limit value. The operating parameter can hereby be an output torque difference between torques transmitted from the output shafts to the planetary gear train or a time derivative of the output torque difference.