Unfoldable Annular Stator for Tool-Free Bicycle Drive Removal
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Solution Overview
Problem
Existing drive units for two-wheeled vehicles, such as bicycles, are difficult to install, retrofit, and remove without tools, making them vulnerable to theft and vandalism.
Innovation Solution
The annular stator of the disc motor can be unfolded and removed from the rotor disc, with a manually actuatable fixing device allowing tool-free operation, and utilizing existing bicycle structures for mounting components, such as the brake disc receptacle and caliper, enabling quick installation and removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the drive unit is permanently fixed to the bicycle, then the reliability and stability of the drive system is improved, but the ease of removal and anti-theft security deteriorates
Solution Approach 1:
The drive unit is divided into separable components: the rotor disc remains permanently mounted on the wheel hub for reliable power transmission, while the annular stator is made detachable through segmentation. This allows the stator to be easily removed for security purposes while the rotor remains fixed for operational reliability.
Solution Approach 2:
The annular stator is extracted as a separate, removable component from the integrated motor assembly. By making the stator detachable while keeping the rotor fixed, the invention enables easy removal of essential parts for anti-theft security while maintaining the reliability of the fixed rotor disc for drive function.
2Manufacturing precision
If the drive unit requires tools for installation and removal, then the manufacturing precision and secure mounting is improved, but the ease of operation and rapid removal deteriorates
Solution Approach 1:
The invention replaces tool-based mechanical fastening systems with a tool-free locking mechanism. The manually actuatable fixing device uses a cam lever or similar mechanical advantage system that can be operated by hand to securely lock and unlock the stator, eliminating the need for tools while maintaining secure mounting.
Solution Approach 2:
The fixing device is designed to be self-servicing through manual operation. The cam lever or quick-release mechanism allows the user to independently secure and release the stator without external tools, combining ease of operation with secure mounting through user-actuated mechanical advantage.
3Ease of operation
If the annular stator is made detachable, then the ease of removal and anti-theft security is improved, but the device complexity and installation difficulty increases
Solution Approach 1:
The fixing device is merged with the existing structure of the annular stator and rotor disc assembly. By integrating the locking mechanism into the stator itself rather than adding separate complex fastening systems, the invention achieves easy tool-free removal while minimizing additional complexity in the overall drive unit design.
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
Facilitates easy installation and removal of the drive unit without tools, enhancing security by allowing safe storage of essential parts and integrating a rechargeable energy storage unit for convenient charging.
Implementation Method 1
a rotor disc (11) with permanent magnets (12) and an annular stator (13) with windings, which generate an electrical alternating field for driving the rotor disc (11)
Data Source
AI summary
The invention relates to a drive unit for fitting or retrofitting a two-wheeled vehicle (1), preferably a bicycle, having an electric motor which is designed as a disc motor (10), comprising a rotor disc (11) having permanent magnets (12) and an annular stator (13) with windings, which generate an electrical alternating field for driving the rotor disc (11), wherein the rotor disc (11) can be fastened non-rotatably to a receptacle (6) on the front or rear wheel of the two-wheeled vehicle (1) and the annular stator (13) can be fastened to a frame part (4, 5) of the two-wheeled vehicle (1). For tool-free dismantling the annular stator (13) can be unfolded in the circumferential direction and can be removed or pulled off from the rotor disc (11).