Gear Train With Internal-External Meshing for Efficiency
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Solution Overview
Problem
The power transmission efficiency of a gear train in vehicles decreases when power is transmitted through two external gears meshing with each other in a speed reduction unit.
Innovation Solution
A gear train configuration that includes internal and external gears in speed reduction units, where an external gear and an internal gear mesh with each other, reducing the sliding speed and thereby minimizing power transmission loss and enhancing gear meshing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If two external gears mesh with each other in a speed reduction unit, then the gear train structure is simple and easy to manufacture, but the power transmission efficiency decreases due to higher sliding speed and greater power transmission loss
Solution Approach 1:
The patent changes the gear type parameter from external gear to internal gear in the speed reduction unit. This parameter change reduces the sliding speed between meshing gears, thereby reducing power transmission loss and improving power transmission efficiency while maintaining manufacturability
2Device complexity
If two external gears mesh with each other in a speed reduction unit, then the gear train configuration is conventional and simple, but the gear meshing efficiency decreases due to higher sliding speed
Solution Approach 1:
The patent modifies the gear configuration parameter by replacing external gears with internal gears in the speed reduction unit. This change reduces sliding speed and improves gear meshing efficiency without significantly increasing device complexity
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 achieves higher power transmission efficiency by reducing power transmission loss and increasing gear meshing efficiency in the speed reduction units, compared to traditional setups with only external gears.
Implementation Method 1
an external gear and an internal gear may mesh with each other in at least one of the speed reduction units
Data Source
AI summary
Provided are a gear train and a vehicle installing the gear train. The gear train is configured to transmit power from a rotating electrical machine to a driving wheel through a differential and a drive shaft. The gear train includes a plurality of shafts on a plurality of axes lying different from each other and a plurality of gears that is disposed respectively on the plurality of shafts. At least one of the plurality of gears is an internal gear.