Modular Bicycle Frame Integrating Auxiliary Motor and Battery Pack
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Solution Overview
Problem
Existing electric bicycles face issues with heavy weight, poor maneuverability, and aesthetic concerns due to external battery packs and cable connections, which are prone to damage and affect aerodynamics, and the installation process is complex and costly.
Innovation Solution
A modular bicycle frame design that allows for easy integration of an auxiliary motor and battery pack, with a compact, cable-free setup where the battery pack and motor are attached directly to the frame, using plug-in contacts and a wireless control unit for improved reliability and aesthetics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If external battery packs and cable connections are used, then the electric bicycle can be powered, but the reliability decreases due to damage risk from impacts and external influences
Solution Approach 1:
The patent integrates the battery pack directly into the frame structure, merging previously separate components (battery, frame, cables) into a unified system. The battery pack is mounted within the triangle formed by frame tubes, eliminating external cable connections and saddlebag mounting, thereby resolving the reliability issue caused by external connections and impact vulnerability.
2Ease of operation
If saddlebags with battery packs are mounted externally, then the electric bicycle can operate, but the aerodynamics and aesthetic appearance deteriorate
Solution Approach 1:
The battery pack is nested within the frame structure, specifically positioned inside the triangle formed by the seat tube, down tube, and chainstay. This nesting approach allows the battery to be integrated into the overall frame geometry, maintaining aerodynamic contours and aesthetic appearance while still providing sufficient space for the power source.
3Ease of operation
If auxiliary drives are mounted in the seat tube, then the electric bicycle can function, but the device complexity increases due to multiple installation steps and specialized components
Solution Approach 1:
The frame design incorporates universal mounting features that can accommodate both traditional bicycle components and electric drive components. The seat tube and surrounding structure are designed to accept the auxiliary motor and battery pack using standard mounting techniques, allowing the same frame to serve both conventional and electric bicycle functions without requiring specialized installation procedures.
Data Source
AI summary
An auxiliary motor, for a bicycle, includes an energy storage device for storing energy, a drive device for converting the energy stored in the energy storage device into kinetic energy and a transmission device for transmitting the kinetic energy onto a pedal crank spindle. The auxiliary motor is designed to be attached to a down tube of a bicycle at least parallel to the down tube and to power a pedal crank of the bicycle.