Anti-turn Device for Electric Machine Power Cable
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Solution Overview
Problem
Existing anti-rotation devices for electrical machines in motor vehicles require a housing for secure attachment, complicating manufacturing and maintenance, and are not easily adaptable for different installation positions.
Innovation Solution
A detachable plug-in connection between the anti-twist device and the heat sink, featuring a non-rotatable plug-in pin and opening with non-circular cross-sections, and an axial lock with snap hooks, allowing secure attachment independent of a housing and enabling easy assembly and replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an anti-twist device is attached to a housing, then the device is secured in a torsion-proof manner, but the manufacturing process becomes more complex and the device cannot be easily replaced
Solution Approach 1:
The anti-twist device is separated from the housing structure and attached directly to the power connection bolt as an independent component. This segmentation allows the anti-twist device to be manufactured separately and attached via a simple plug-in connection, reducing overall manufacturing complexity while maintaining torsion-proof security.
Solution Approach 2:
A detachable plug-in connection serves as an intermediary between the anti-twist device and the power connection bolt. This intermediary mechanism provides torsion-proof attachment without requiring integration into the housing, simplifying manufacturing while ensuring reliable connection.
2Ease of operation
If the anti-twist device is made detachable, then easy assembly and replacement are enabled, but the risk of accidental detachment increases
Solution Approach 1:
The plug-in connection features an asymmetric design where the plug-in opening and pin have specific geometric configurations that allow insertion in one direction but prevent accidental removal. The asymmetric shape ensures the connection can be easily assembled by pushing in while requiring deliberate action for removal, thus maintaining both ease of operation and attachment security.
3Reliability
If a clamping connection is used, then the anti-twist device remains securely in place during transport and installation, but the assembly process becomes more complex
Solution Approach 1:
The plug-in connection utilizes a dynamic clamping mechanism where the connection elements are designed to automatically engage and clamp when inserted. The clamping force is generated through the insertion motion itself, eliminating the need for separate clamping mechanisms and keeping assembly simple while ensuring secure positioning during transport and installation.
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 provides a torsion-proof attachment of the anti-twist device to the electrical machine, preventing accidental detachment during manufacturing and installation, and allowing for versatile installation positions, ensuring secure and reliable operation.
Implementation Method 1
the heat sink usually consists of a resilient material, for example a metallic material, which can absorb high torsional forces without being damaged
Implementation Method 2
the plug-in spigot is designed conically, so that the plug-in opening can bring about a clamping effect by being pushed onto the plug-in spigot
Data Source
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AI summary
The invention relates to an electric machine (10,101), particularly a generator (102), for a motor vehicle, comprising a cooling body (53, 103) and a power connection pin (106), onto which a connecting eyelet (126) of a power cable (127) can be pushed, and comprising an anti-turn device (108) for preventing a rotation of the connecting eyelet (128) about the longitudinal axis (107) of the power connection pin (106). According to the invention, the anti-turn device (108) comprises a detachable plug-in connection (118) to the cooling body (103), said connection being positioned non-rotatably about the longitudinal axis (107) of the power supply pin (106).