Steering Assembly Locking for Foldable E-Bike Stability
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Solution Overview
Problem
Existing folding electric bicycles are challenging to fold, lack stability due to heavy battery placement, and often require complex mechanisms that make them difficult to lock securely in a folded position, making them prone to theft.
Innovation Solution
A low step-through foldable electric bicycle with a novel front wheel steering assembly that allows for easy folding and locking, featuring a mid-drive motor, batteries mounted low for stability, and a hinge near the midpoint for lateral folding, enabling easy rolling and secure locking in the folded position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If folding hinges are positioned to avoid interference with frame components, then the folding mechanism is simplified, but hub motors become susceptible to damage and cannot utilize the bicycle's gear system
Solution Approach 1:
The motor is extracted from the wheel hub and repositioned to the frame's bottom bracket area, separating it from the folding hinge location. This allows the hinge to be positioned without interfering with motor components while the motor itself is protected within the frame structure and can utilize the bicycle's gear system through the chain drive.
Solution Approach 2:
A chain drive system acts as an intermediary between the motor and the rear wheel, allowing the motor to be positioned at the bottom bracket while still providing power to the wheel. This intermediary mechanism enables gear system utilization and protects the motor from exposure at the wheel hub.
2Ease of manufacture
If heavy elements like batteries are positioned higher for easier frame integration, then manufacturing is simplified, but bicycle stability decreases
Solution Approach 1:
The battery is positioned low in the frame structure, creating a low center of gravity that enhances stability. This positioning balances the frame geometry requirements with stability needs by placing heavy elements at a lower potential energy state, making the bicycle more stable during operation.
3Reliability
If folding bicycles use complex locking mechanisms to secure the folded position, then security against theft improves, but ease of operation deteriorates
Solution Approach 1:
The locking mechanism is merged with the folding hinge assembly, combining the structural folding function with the security locking function. This integration allows the same components that enable folding to also provide secure locking, eliminating the need for separate complex locking mechanisms and simplifying user operation.
Solution Approach 2:
The folding mechanism is designed to automatically lock into position through its own structural features, without requiring separate locking actions from the user. The hinge assembly self-secures in the folded position through its design, providing both folding capability and security through a single simplified user action.
Data Source
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AI summary
Presented herein is a foldable bicycle (folding bike) with improvement including a step-through or low step-over electric bicycle (eBike, pedelec) with a main frame member or members extending rearward from the head tube to a hinge and a bottom bracket where a mid-drive motor may be positioned, and wherein at least one battery is mounted to the frame, and wherein the hinge is located near the midpoint of the bicycle and allows the front frame assembly and the rear frame assembly to pivot laterally around the hinge in a manner moving generally parallel to the ground to a folded position. Other improvements presented herein include a foldable bicycle, electric, or non-electric, with a handlebar and stem which are moveable to a steering assembly storage position, and in the storage position the handlebar and/or stem serve to fasten the foldable bicycle in the folded position. The folded bicycle may be rolled along the ground in the folded position.