EV Transmission Mechanism With Perpendicular Shafts for Vibration Stability
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Solution Overview
Problem
The structural stability of electric vehicle transmission mechanisms is compromised by vibrations from road conditions, particularly when the motor is positioned at the front or rear wheel, leading to unbalanced center of gravity and limited design flexibility due to axis-parallel configurations.
Innovation Solution
An electric vehicle transmission mechanism featuring a transmission shaft with a transmission portion connected to the chain wheel, an output shaft with a perpendicular output axial direction, and a bearing configuration that includes a lower bearing sleeved on the output shaft and an upper bearing located between the lower bearing and the output portion, enhancing structural stability and load balancing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the motor is disposed at the front wheel or rear wheel to directly drive the wheel axle, then the motor can provide direct kinetic power, but the center of gravity of the electric vehicle becomes unbalanced
Solution Approach 1:
The patent introduces a transmission mechanism as an intermediary between the motor and the wheel axle. The motor is positioned in the frame (not directly at the wheel), and the transmission mechanism transmits kinetic power from the motor to the wheel axle through transmission shafts and chain wheels, thereby balancing the center of gravity while still providing direct drive capability
Solution Approach 2:
The patent segments the drive system into distinct components: the motor disposed separately in the frame, the transmission mechanism with transmission shafts and chain wheels, and the wheel axle. This segmentation allows the motor to be positioned for optimal center of gravity balance while the transmission system handles power delivery to the wheels
2Stability of the object's composition
If the motor is disposed in the center of the frame with axis-parallel configuration, then the center of gravity is balanced, but the structural design is limited by the width of the bottom bracket
Solution Approach 1:
The patent changes the spatial arrangement from an axis-parallel configuration to an axis-perpendicular configuration. The transmission shafts are arranged perpendicular to the motor axis, allowing the transmission mechanism to extend in a different dimension (length direction of the frame) rather than being constrained by the bottom bracket width, thereby significantly improving structural design flexibility
3Stability of the object's composition
If the transmission mechanism is modified to improve structural stability, then vibrations from road conditions can be better managed, but the device complexity increases
Solution Approach 1:
The patent merges the transmission shafts and chain wheels into an integrated transmission mechanism assembly that is collectively disposed in the frame. The first transmission shaft connects to the first chain wheel, and the second transmission shaft connects to the second chain wheel, forming a unified system that manages vibrations effectively while maintaining reasonable complexity through systematic integration
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 described configuration improves the structural stability and load balancing of the electric vehicle transmission mechanism, increasing its operational lifespan and design flexibility by effectively managing vibrations and axial forces through a bevel gear and bearing structure.
Implementation Method 1
The lower bearing is sleeved on the output shaft. The upper bearing is sleeved on the output shaft and located between the lower bearing and the output portion
Data Source
AI summary
An electric vehicle transmission mechanism which is applied to drive a chain wheel of an electric vehicle is provided. The electric vehicle transmission mechanism includes a transmission shaft, an output shaft, a lower bearing and an upper bearing. The transmission shaft is connected to the chain wheel and has a transmission axial direction, and the transmission shaft includes a transmission portion. The output shaft includes an output portion engaged with the transmission portion, and the output shaft has an output axial direction substantially perpendicular to the transmission axial direction. The lower bearing is sleeved on the output shaft. The upper bearing is sleeved on the output shaft and located between the lower bearing and the output portion.