E-bike Frame with Concealed Battery and Structural Bearing
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Solution Overview
Problem
Conventional e-bike frames often have exposed or semi-exposed batteries, which compromise the structural integrity, aerodynamics, and aesthetic appeal, leading many cyclists to avoid them.
Innovation Solution
A bicycle frame design with a fully concealed battery integrated into the frame, utilizing a through opening in the bottom bracket housing and a structural bearing assembly to maintain strength and durability, allowing battery access without compromising the frame's integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a through opening is made in the bottom bracket housing to access the battery, then battery accessibility is improved, but the structural integrity and strength of the bottom bracket housing deteriorates
Solution Approach 1:
A bearing assembly is introduced as an intermediary structural component that spans the through opening in the bottom bracket housing. This bearing assembly acts as a mediator that provides the necessary structural reinforcement to compensate for the weakness created by the opening, while still allowing battery access through the same opening. The bearing assembly effectively decouples the conflict between accessibility and strength by providing a separate structural element that maintains both functions.
2Shape
If the battery is concealed within the frame, then aesthetic appearance and aerodynamics are improved, but frame structural integrity deteriorates
Solution Approach 1:
The battery is nested within the down tube of the bicycle frame, utilizing the existing hollow space inside the down tube to house the battery. This nesting approach allows the battery to be concealed within the frame structure without requiring additional external containers or modifications that would compromise the frame's structural integrity. The down tube serves as a pre-existing cavity that can accommodate the battery while maintaining the overall strength and aesthetic appearance of the frame.
3Ease of operation
If frame modifications are made to accommodate battery access, then battery accessibility is improved, but manufacturing complexity and frame strength deteriorate
Solution Approach 1:
The bottom bracket housing is segmented into functional zones: a through opening is created to allow battery access, while a bearing assembly is positioned to provide structural reinforcement. This segmentation allows the housing to simultaneously serve multiple functions - battery access and structural support - without requiring complex overall frame modifications. The bearing assembly is positioned at a specific location within the housing to optimize both accessibility and strength.
Data Source
AI summary
A bicycle frame is discussed having a battery fully contained within a down tube of the bicycle frame. The battery may be inserted into or removed from the down tube via a through opening through a bottom bracket housing of the bicycle frame. Weakness in the bottom bracket housing due to the through opening may be compensated for, fully or partially, by utilizing a bottom bracket bearing assembly that has a structural component, or structural component assembly, that extends completely through the bottom bracket housing and removably couples to the bottom bracket housing.