Bicycle Internal Transmission Hub Integration
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Solution Overview
Problem
Existing bicycle internal transmission hubs are not easily coupled to a bicycle body, lacking integration of power generation and storage mechanisms within the hub, which complicates installation and maintenance.
Innovation Solution
A bicycle internal transmission hub with an integrated hub shell, shifting unit, electric actuator, power generation mechanism, power storage mechanism, and electronic control unit, where the electric actuator is driven by the power generation mechanism and controlled by the electronic control unit, allowing for easy coupling and stable power supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the electric actuator and power generation mechanism are integrated within the hub shell, then the ease of coupling to bicycle body is improved, but the device complexity increases
Solution Approach 1:
The patent integrates the electric actuator, power generation mechanism, power storage mechanism, and electronic control unit within the hub shell's accommodation cavity. This merging of multiple subsystems into a single integrated hub assembly eliminates the need for separate mounting operations, simplifying installation to a single coupling operation while achieving the desired ease of coupling to the bicycle body.
Solution Approach 2:
The hub shell is designed as a multi-functional container that simultaneously houses the transmission mechanism, electric actuator for shifting, power generation mechanism, power storage mechanism, and electronic control unit. This universal design allows a single component (the hub) to perform multiple functions, reducing the number of separate parts that need to be coupled to the bicycle body.
2Ease of manufacture
If the power generation mechanism and power storage mechanism are integrated within the hub, then the ease of manufacture is improved, but the volume of the hub increases
Solution Approach 1:
The power storage mechanism is positioned within the accommodation cavity of the hub shell, and the power generation mechanism is integrated alongside it. This nested arrangement allows the power systems to be contained within the existing hub volume rather than adding external protrusions, minimizing the overall volume increase while achieving integrated manufacturing.
Solution Approach 2:
The patent arranges the power generation mechanism and power storage mechanism in different spatial zones within the hub's accommodation cavity, utilizing three-dimensional space efficiently. By distributing components along different axes and layers within the hub volume, the design accommodates multiple mechanisms without significantly increasing the external dimensions of the hub.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables easy installation and stable operation of the bicycle internal transmission hub by integrating power generation and storage within the hub shell, optimizing weight balance and providing a self-sufficient power system.
Implementation Method 1
a power generation mechanism that generates power used to drive the electric actuator
Implementation Method 2
a power storage mechanism that stores power supplied from the power generation mechanism
Data Source
AI summary
A bicycle internal transmission hub is provided that can be easily coupled to a bicycle body. The bicycle internal transmission hub includes a hub shell, a shifting unit, and an electric actuator. The hub shell defines an accommodation cavity. The shifting unit is located in the accommodation cavity, and is configured to select one speed stage from a plurality of speed stages. The electric actuator is located in the accommodation cavity to drive the shifting unit.