Electric Bicycle Hub Assembly for Automated Planetary Gear Shifting
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Solution Overview
Problem
Conventional bicycle transmissions require complicated manual operations for speed changes, which are labor-intensive and hinder a seamless riding experience.
Innovation Solution
A hub assembly with an electric shifting assembly and a driving motor is integrated into the bicycle hub, allowing for accurate and simple gear shifts through automated control, assisted by sensors and motors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual thumb shifter operation is used to control speed changes, then the transmission can be controlled, but the operation becomes complicated and labor-intensive
Solution Approach 1:
The patent replaces the manual mechanical thumb shifter system with an automated electric control system. A control assembly with an electric motor actuates the planetary gear assembly through electromagnetic conversion, eliminating the need for manual thumb shifter operations and reducing operational complexity while maintaining transmission control functionality
Solution Approach 2:
The control assembly automatically adjusts the transmission path of the driving force without requiring manual intervention. The system self-regulates the gear shifting process by using the electric motor to actuate the planetary gear assembly, making the system serve itself rather than requiring user operation
2Productivity
If conventional manual transmission control is used, then speed changes can be achieved, but the riding experience is degraded due to labor-intensive operations
Solution Approach 1:
The patent substitutes the manual mechanical operation system with an automated electric actuation system. The electric motor in the control assembly converts electrical energy to mechanical motion to adjust the planetary gear assembly, dramatically improving gear shifting efficiency while eliminating labor-intensive manual operations
Solution Approach 2:
The control assembly acts as an intermediary between the power source and the planetary gear assembly. It uses an electric motor as a mediator to automatically actuate the transmission path switching, improving productivity while removing the need for direct manual labor in gear shifting operations
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 labor-saving, precise gear changes with enhanced riding experience by eliminating the need for manual shifting operations.
Implementation Method 1
a planetary gear assembly arranged on the hub shaft and in the hub, where the planetary gear assembly is configured to transmit a driving force to the hub
Implementation Method 2
an electric transmission assembly configured to act on the control assembly, to switch the transmission path of the driving force; and a driving motor arranged in the hub and configured to provide the driving force to the hub
Implementation Method 3
a drive member driven by the control motor, where the drive member is configured to act on the pushing portion, to rotate the control ring around the hub shaft
Data Source
AI summary
A hub assembly, including a hub axle; a hub, which is rotatably sleeved on the hub axle; a planetary gear assembly, which is arranged on the hub axle and in the hub and is used for transmitting a driving force to the hub; a power input member, which is rotatably sleeved on the hub axle and is used for providing a driving force for the planetary gear assembly; a control assembly, which acts on the planetary gear unit and is used for switching a transmission path for the driving force; an electric transmission assembly, which acts on the control assembly so as to switch a transmission path for the driving force; and a driving electric motor, which is arranged in the hub and is used for providing a driving force for the hub.