Electric Bicycle Motor Structure with Nested Decelerator
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Solution Overview
Problem
Conventional motor structures for electric bicycles are complex, cumbersome, and inefficient in terms of assembly and spatial efficiency due to the need for multiple components, which complicates the structure and increases volume.
Innovation Solution
A compact motor structure for electric bicycles featuring a motor with a first and second decelerator unit, where the first decelerator unit is integrated within the rotor and the second decelerator unit is external, connected to the motor housing, simplifying the power transmission and reducing the overall volume by eliminating the need for a separate power transmission unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a motor structure includes a motor, decelerator unit, and power transmission unit as separate components, then the functional requirements are met, but the structure becomes complex and volume increases
Solution Approach 1:
The patent merges the motor, decelerator unit, and power transmission unit into an integrated motor structure where the decelerator unit is positioned inside the motor housing and the power transmission unit is integrated with the decelerator unit, eliminating the need for separate components while maintaining all required functions
Solution Approach 2:
The decelerator unit is nested inside the motor housing, with the sun gear, planet gears, and carrier arranged in a compact planetary gear configuration that fits within the motor's internal space, achieving space-efficient integration of multiple functional components
2Volume of stationary object
If multiple separate components (motor, decelerator unit, power transmission unit) are used, then functional requirements are satisfied, but the volume of the motor structure increases
Solution Approach 1:
The patent combines the motor, decelerator unit, and power transmission unit into a single integrated structure, reducing the overall volume by eliminating gaps and redundant components between separate assemblies
Solution Approach 2:
The planetary gear decelerator unit is nested within the motor housing, with gears and carriers arranged to maximize space utilization, achieving compact volume while maintaining all deceleration and power transmission functions
3Ease of manufacture
If motor, decelerator unit, and power transmission unit are separate components, then each component can be optimized independently, but the assembly process becomes cumbersome and time-consuming
Solution Approach 1:
The patent integrates the decelerator unit and power transmission unit with the motor into a single assembly, eliminating multiple assembly steps and reducing the assembly process to installing the integrated unit as one component, thereby improving both ease of manufacture and assembly speed
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
This configuration results in a more efficient assembly process and improved spatial efficiency by directly transmitting the motor's rotary force to the wheel, enhancing the aesthetic quality and operational simplicity of the electric bicycle.
Implementation Method 1
a motor, a first decelerator unit, a second decelerator unit and a motor housing. The motor may be provided with a rotor and a stator to generate a rotary force
Implementation Method 2
The plurality of first planet gears may be disposed around the first sun gear while being engaged with the first sun gear. The plurality of second planet gears may be disposed around the second sun gear while being engaged with the second sun gear
Data Source
AI summary
A motor structure for an electric bicycle including a motor (500) provided with a rotor (501) and a stator (506) to generate a rotary force to drive a wheel (50) of the electric bicycle, the rotor having an accommodation space formed at a center thereof, a first decelerator unit (510) disposed in the accommodation space and connected to a rotating shaft that is rotated together with the rotor, a second decelerator unit (530) connected to the first decelerator unit and disposed outside the motor, and a motor housing to accommodate the motor and the second decelerator unit.