E-Bike Nested Fastener Layout for Motor and Accessory Alignment
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Solution Overview
Problem
Bicycle components, particularly on e-bikes, face alignment issues due to frame deformation and complexity in threading, leading to misalignment, increased manufacturing and repair costs, and accessibility challenges with fasteners.
Innovation Solution
Implementing a fastener-within-fastener arrangement that aligns motor and accessory components with the frame assembly, reducing the need for threading in the frame and allowing easier access to fasteners, especially on the drive side.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If components are fixed with traditional fasteners requiring frame threading, then components can be securely attached, but manufacturing and repair complexity increases, and threading can be damaged during manufacturing processes
Solution Approach 1:
The patent implements a fastener-within-fastener arrangement where an accessory fastener is positioned inside the hollow portion of a motor fastener. This nesting configuration allows both fasteners to secure components without requiring separate threading operations in the frame, thereby reducing manufacturing complexity while maintaining secure attachment. The motor fastener threads into the frame first, creating a hollow space that accommodates the accessory fastener, eliminating the need for additional frame threading.
2Manufacturing precision
If multiple fasteners are used to secure motor assembly and accessory components, then component alignment can be achieved, but accessibility to fasteners becomes difficult requiring disassembly of other components
Solution Approach 1:
By nesting the accessory fastener within the motor fastener's hollow portion, the patent enables both fasteners to be accessed from the same side of the motor assembly. The accessory fastener extends into the hollow space created by the motor fastener, allowing both fasteners to be installed and removed without disassembling other components. This resolves the accessibility issue while maintaining precise alignment through the coordinated fastening action of both fasteners.
3Adaptability or versatility
If traditional separate fastener arrangement is used, then each component can be secured independently, but tolerance stack-up leads to misalignment of components
Solution Approach 1:
The nested fastener configuration creates an interdependent alignment system where the accessory fastener is positioned within the motor fastener's hollow portion. This arrangement ensures that both fasteners work together to maintain precise alignment, eliminating tolerance stack-up issues. The physical constraint of the nested configuration forces the components to align properly, as the accessory fastener cannot be properly installed unless the motor assembly is correctly positioned relative to the frame.
Solution Approach 2:
The hollow portion of the motor fastener acts as an intermediary space that accommodates the accessory fastener. This intermediary configuration allows the accessory component to be precisely positioned relative to the motor assembly, mediating the alignment between the frame and accessory components. The nested arrangement serves as a mechanical mediator that ensures proper alignment while still allowing independent securing of both components.
Data Source
AI summary
An e-bike includes a frame assembly, wheels supporting the frame assembly, a motor assembly coupled to the frame assembly by a motor fastener having a hollow portion, and an accessory component coupled to the frame assembly by an accessory fastener positioned at least partially in the hollow portion of the motor fastener.