Electric Motorcycle Drive Layout With Coaxial Integrated Reduction
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Solution Overview
Problem
Traditional electric motorcycle drive systems suffer from insufficient integration, large size, high cost, low reliability, and low synergistic efficiency due to the mechanical and electrical independence of components, leading to energy loss and control instability.
Innovation Solution
An integrated drive system design where the controller, motor, and reducer are tightly coupled within a motor housing, with a coaxial arrangement of the main shaft, output shaft, and internal gear ring, and enhanced heat dissipation, reducing friction and energy conversion losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If traditional two-in-one structure with independent subsystems is used, then manufacturing and assembly are simplified, but integration is insufficient, size is large, and reliability is low
Solution Approach 1:
The patent merges the controller, motor, and reducer into a single integrated motor housing structure. The controller is disposed in the motor housing, the motor and reducer are coaxially arranged within the same housing, achieving tight coupling of previously independent subsystems. This merging eliminates the need for separate housings and interconnections, directly resolving the contradiction by improving integration while enhancing reliability through unified structural support and reduced connection points.
Solution Approach 2:
The motor housing serves multiple functions simultaneously: it houses the controller, supports the motor assembly, contains the reducer, provides heat dissipation pathways, and acts as a structural mounting point for the wheel hub. This multi-functionality allows a single component to replace what would traditionally require multiple separate components, thereby improving integration without compromising reliability.
2Loss of energy
If traditional parallel-axis gear reduction mechanism is used, then mechanical connection is straightforward, but transmission efficiency is low due to energy loss
Solution Approach 1:
The patent replaces the traditional parallel-axis gear reduction mechanism with a coaxial gear reduction mechanism where the motor shaft, planetary gear carrier, and output shaft are all coaxially arranged. This substitution reduces the number of meshing stages and eliminates complex transmission paths, thereby reducing friction and energy conversion losses while improving transmission efficiency.
Solution Approach 2:
The patent changes the geometric arrangement of the transmission components from parallel-axis to coaxial configuration. This parameter change in the spatial arrangement of gears and shafts optimizes the transmission path, reduces the number of engagement points, and minimizes energy loss during power transmission, directly addressing the contradiction between energy loss and transmission efficiency.
3Reliability
If components are independently connected mechanically and electrically, then assembly is flexible, but synergistic efficiency is low and control stability is poor
Solution Approach 1:
The patent combines mechanical and electrical connections within a unified motor housing structure. The controller is electrically connected to the motor through connections disposed within the housing, and mechanically supported by the same structure. This merging eliminates independent connection pathways, reducing signal interference and mechanical misalignment, thereby improving both control stability and synergistic efficiency simultaneously.
Data Source
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AI summary
Disclosed is an electric motorcycle drive system, including a rear fork bracket connected to a motorcycle frame. A motor housing (1) is disposed on one side of the rear fork bracket . A controller (2), a motor (3), and a reducer (4) are disposed in the motor housing (1). The controller (2) and the reducer (4) are located at two ends of the motor (3), respectively. An output shaft (20) is disposed on the reducer (4), and a wheel hub (23) is disposed on the output shaft (20). The output shaft (20) is rotatably connected to the other side of the rear fork bracket. An integrated drive system improves overall transmission efficiency, and allows optimization of a transmission ratio to further improve system efficiency, thereby reducing the cost of the drive system.