Coaxial Drive-Transmission Shaft Coupling for Independent Testing
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Solution Overview
Problem
Existing drive assemblies for motor vehicles do not allow for independent functional testing of the transmission, making it difficult to detect faults early and assign them to specific components before assembly.
Innovation Solution
A drive assembly design where an electric drive with a drive shaft is coaxially connected to a transmission input shaft via a toothing system and a press fit or positive connection, allowing for independent testing of the transmission and drive components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the drive shaft and input shaft are rigidly connected for conjoint rotation, then torque transmission is reliable, but independent functional testing of transmission becomes impossible
Solution Approach 1:
The connection between drive shaft and input shaft is segmented into two independent functional aspects: circumferential connection for torque transmission and axial connection for positioning. This allows the transmission to be tested independently by disconnecting the axial connection while maintaining the circumferential torque transmission capability.
Solution Approach 2:
The toothing system serves multiple functions: it provides positive connection in the circumferential direction for reliable torque transmission, while simultaneously allowing non-positive connection in the axial direction to enable separate functional testing of the transmission and drive components.
2Reliability
If the drive shaft and input shaft are connected via toothing system, then circumferential connection is positive, but axial connection becomes non-positive allowing independent testing
Solution Approach 1:
The connection system is segmented into circumferential and axial components, with the toothing system handling only the circumferential positive connection while axial positioning is achieved through simpler means such as press fit or stops, reducing overall complexity.
Solution Approach 2:
The toothing system is merged with the shaft connection structure, combining torque transmission and positioning functions into a single integrated component that achieves both circumferential engagement and axial location without requiring separate mechanisms.
3Difficulty of detecting and measuring
If separate functional testing is enabled, then fault detection capability improves, but assembly complexity increases
Solution Approach 1:
The drive assembly is segmented into separable drive and transmission portions that can be tested independently, with the toothing system serving as the interface that can be easily connected or disconnected for testing purposes without requiring complex assembly or disassembly procedures.
Data Source
AI summary
A drive assembly comprises at least an electric drive having a drive shaft, and a transmission having at least one input shaft, wherein a drive power of the electric drive can be transmitted to the input shaft via the drive shaft, and can be transmitted from the input shaft into the transmission. The drive shaft and the input shaft are coaxial to one another and are interconnected by way of a toothing that is form-fitting at least in a circumferential direction. The drive shaft and the input shaft are at least frictionally connected at least in relation to an axial direction at least via a press fit formed in each case between an inner circumferential surface and an outer circumferential surface which are parallel to an axis of rotation, or the drive shaft and the input shaft together form a form-fitting connection via a connecting element.