Symmetrical EV Powertrain Layout With Nested Gear Reduction
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Solution Overview
Problem
Existing electric vehicles with distributed driving powertrain systems face challenges due to their large structure size, which complicates vehicle layout and increases space occupancy.
Innovation Solution
A powertrain system comprising symmetrical subsystems with a cylindrical gear pair and a bevel gear pair, strategically arranged to reduce size and optimize space usage, including the use of transmission shafts and bearings for improved stability and compactness, allowing for independent control of left and right driving wheels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a distributed driving powertrain system is used to enable independent control of left and right driving wheels, then active vehicle control and driving safety are improved, but the structure size becomes large, causing layout difficulty
Solution Approach 1:
The patent employs a nested gear arrangement where a cylindrical gear pair is positioned inside or alongside a bevel gear pair. The cylindrical gears transmit power from the motor shaft, and the bevel gears transfer this power to the output shaft at a different angle. This nesting allows multiple gear stages to occupy a compact three-dimensional space, reducing the overall powertrain volume while maintaining independent wheel control capability
Solution Approach 2:
The patent utilizes spatial arrangement by disposing the cylindrical gear pair and bevel gear pair at specific angular relationships. The rotation shaft of the motor is disposed in a second direction at a specific included angle relative to the first direction of side-by-side subsystem arrangement. This dimensional optimization allows the powertrain to fit within a smaller footprint by exploiting three-dimensional space efficiently
2Power
If traditional gear arrangements are used in the powertrain system, then power transmission is achieved, but the space occupied by the powertrain system is large
Solution Approach 1:
The cylindrical gear pair and bevel gear pair are arranged in a nested configuration where the cylindrical gears are positioned to engage with the bevel gears in a compact arrangement. This nesting minimizes the lateral space required for power transmission while maintaining the necessary gear ratios and torque transfer capabilities
Solution Approach 2:
The patent combines the functions of multiple gear stages into a single integrated deceleration mechanism. The cylindrical gear pair handles the first stage of power transmission and deceleration, while the bevel gear pair handles the second stage and directional change. By merging these functions into a unified compact mechanism rather than separate assemblies, the overall space occupied is reduced
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
The solution effectively reduces the size and space occupied by the powertrain system, simplifying the vehicle layout and enhancing the compactness and reliability of the electric vehicle's powertrain, enabling more efficient use of space and improved assembly efficiency.
Implementation Method 1
The cylindrical gear pair may be used as a first-stage gear pair to transmittedly connect to the motor
Implementation Method 2
the bevel gear pair may be used as a second-stage gear pair to connect to the output shaft
Implementation Method 3
A first bearing may be disposed on an inner wall of the housing, and one end that is of the first transmission shaft and that faces away from the motor may be rotationally assembled in the first bearing
Data Source
AI summary
A powertrain system and an electric vehicle to reduce a structure size of the powertrain system. The powertrain system includes two subsystems. The two subsystems are disposed side by side in a first direction and are symmetrical to each other. Each of the subsystems includes a motor, a deceleration mechanism, and an output shaft. A rotation shaft of the motor is disposed in a second direction. The deceleration mechanism includes a cylindrical gear pair and a bevel gear pair. The cylindrical gear pair includes an active cylindrical gear and a driven cylindrical gear, and the active cylindrical gear is connected to the rotation shaft of the motor. The driven cylindrical gear is located on a side that is of the active cylindrical gear and that is away or distal from the other subsystem. The bevel gear pair includes an active bevel gear and a driven bevel gear.