Bicycle Crank Assembly Battery Replacement Mechanism
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Solution Overview
Problem
Existing bicycle crank assemblies lack a convenient and efficient method for replacing battery units, which are essential for powering electronic components, as they often require disassembly of the crank arm, complicating maintenance and upgrades.
Innovation Solution
A bicycle crank assembly design featuring a detachable battery holding structure with a lock element and switching mechanism, allowing for battery replacement through a dedicated end opening without removing the crank arm, along with electric contacts for secure power connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the battery unit is integrated into the crank assembly, then the power supply for electronic components is ensured, but the replacement of the battery unit becomes complex requiring disassembly of the crank arm
Solution Approach 1:
The battery holding structure is designed as a separate, detachable component from the crank arm. The holding structure includes a body with a cavity that receives the battery unit, and it can be detached from the crank arm through a release mechanism, allowing easy battery replacement without removing the crank arm itself.
Solution Approach 2:
The battery holding structure is extracted as an independent serviceable component. It can be removed from the crank arm assembly, allowing the battery unit to be accessed and replaced independently. This extraction enables maintenance operations without affecting the structural integrity of the crank arm.
2Ease of repair
If the battery holding structure is detachable, then the battery replacement process is simplified, but the structural complexity of the crank assembly increases
Solution Approach 1:
The battery holding structure merges multiple functions into a single component: it provides structural support for the battery unit, electrical connection through integrated contacts, and mechanical attachment to the crank arm. This consolidation reduces the number of separate parts needed while maintaining ease of replacement.
Solution Approach 2:
The holding structure body serves multiple purposes: it acts as a mounting structure for the battery unit, provides a pathway for electrical contacts, and interfaces with the crank arm through attachment features. This multi-functionality reduces overall assembly complexity despite the added detachable capability.
3Ease of operation
If the battery unit is accessible through the end opening, then the replacement operation is simplified, but the protection of the internal cavity is reduced
Solution Approach 1:
The cover element is provided to close the end opening when the battery holding structure is attached to the crank arm. This preliminary protective measure ensures that the internal cavity remains protected from contaminants during normal operation, while still allowing battery access when needed through the release mechanism.
Data Source
AI summary
A bicycle crank assembly comprises a crank axle, a first crank arm, and a battery holding structure. The crank axle comprises a cavity and a first end portion. A battery unit is to be provided in the cavity. The first end portion has a first end opening which is in communication with the cavity. The first crank arm is configured to be mounted on the first end portion. The battery holding structure is configured to hold the battery unit in the cavity. The battery holding structure is configured so that the battery unit is replaceable through the first end opening in a state where the first crank arm is mounted on the first end portion of the crank axle.