E-Bike Drive Unit Layout for Guided In-Frame Battery Mounting
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Solution Overview
Problem
Existing technologies face challenges in efficiently mounting battery units on human-powered vehicles, particularly in ensuring proper alignment and electrical connectivity between the battery and motor components, while maintaining a compact and stable structure.
Innovation Solution
A drive unit for human-powered vehicles is designed with a base, frame mount, and guide that allows the battery unit to be mounted within the frame, featuring a motor aligned parallel to the crankshaft, an electrical connector close to the crankshaft axis, and a battery holder to facilitate easy connection and movement of the battery unit, with restrictions to ensure stability and ease of attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the battery unit is mounted on the frame of the human-powered vehicle, then the battery unit can be securely positioned, but it becomes difficult to align and connect the electrical connector with the motor
Solution Approach 1:
The patent introduces an electrical connector as an intermediary component between the battery unit and motor. The connector includes a battery unit connection portion and a motor connection portion, allowing the battery unit to be connected to the motor even when not in direct contact. This mediator enables flexible positioning while maintaining reliable electrical connection.
Solution Approach 2:
The patent positions the electrical connector at a location different from the direct battery-motor interface, utilizing spatial dimensionality to resolve the connection issue. The connector can be positioned closer to the motor while the battery unit remains mounted on the frame, connecting them through the connector's extended structure.
2Volume of moving object
If the motor is positioned close to the crankshaft for compact design, then the overall structure becomes more compact, but the electrical connector becomes harder to reach and connect
Solution Approach 1:
The patent divides the electrical connection system into separate segments: the battery unit connection portion, the electrical connector, and the motor connection portion. This segmentation allows each component to be positioned independently, enabling the motor to be close to the crankshaft for compactness while the electrical connector remains accessible for connection operations.
3Ease of operation
If the battery unit is allowed to move freely for easy installation, then installation becomes simpler, but the battery unit becomes unstable during operation
Solution Approach 1:
The patent implements a dynamic positioning system for the battery unit using the guide structure. The guide allows the battery unit to move along a predetermined path during installation, providing ease of installation. Once positioned, the battery unit is restrained by the guide to maintain stability during operation. This dynamic approach transitions from free movement to constrained positioning.
Data Source
AI summary
A drive unit configured to be provided to a human-powered vehicle. The drive unit includes a base on which a crankshaft is provided, a frame mount provided on the base, and a guide provided on the base. The frame mount is configured to be mounted on a frame of the human-powered vehicle. The guide is configured to guide a battery unit in a guide direction extending in a longitudinal direction of the frame so that at least part of the battery unit is arranged inside the frame of the human-powered vehicle in a state in which the frame mount is mounted on the frame.