Sunken Wheel-Side Motor Axle Layout for Wider Bus Aisles
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Solution Overview
Problem
New energy commercial buses with conventional wheel-side motor drive axles face challenges in achieving sufficient driving torque while maintaining a comfortable passenger space, as the large drive motor size reduces the aisle width and passenger comfort due to the limited distance between motor end faces.
Innovation Solution
A sunken wheel-side motor drive axle design featuring oil-cooled motors with high power density and multi-stage reducers, where the drive motors are positioned at the bottom of the axle beam assembly, reducing the motor size and space requirements, and utilizing brake air chambers to determine the bus aisle width, thereby increasing the aisle width and improving passenger comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the drive motor size is increased to ensure large driving torque, then the driving torque is improved, but the distance between drive motor end faces is reduced, resulting in smaller bus aisle width and low passenger comfort
Solution Approach 1:
The drive motor is repositioned from a horizontal arrangement to a vertical arrangement at the bottom of the axle beam assembly. This dimensional change allows the motor to generate large torque vertically while freeing up horizontal space, thereby increasing the bus aisle width without compromising driving torque capability
Solution Approach 2:
The transmission system is divided into multiple stages with separate reducer assemblies positioned at different locations. This segmentation allows the drive motor to be decoupled from the final drive position, enabling the motor to be placed at the bottom of the axle beam while maintaining efficient power transmission to the wheels through the multi-stage reduction system
2Force
If the drive motor size is increased to ensure large driving torque, then the driving torque is improved, but the space occupied by the drive motor assembly is increased
Solution Approach 1:
The drive motor is repositioned from a horizontal arrangement to a vertical arrangement at the bottom of the axle beam assembly. This dimensional change allows the motor to generate large torque vertically while freeing up horizontal space, thereby increasing the bus aisle width without compromising driving torque capability
Solution Approach 2:
The brake air chambers are positioned to surround or enclose portions of the drive motor assembly, with the motor nested within the space defined by the brake chambers. This nesting arrangement allows the brake chambers to define the outer boundary for aisle width while the motor occupies the inner space, efficiently utilizing available volume
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 sunken wheel-side motor drive axle effectively reduces the drive motor size and space, maintaining the required torque output while increasing the bus aisle width and enhancing passenger comfort by optimizing the motor placement and using multi-stage reducers.
Implementation Method 1
oil-cooled motor
Implementation Method 2
oil-cooled motor
Implementation Method 3
the brake air chamber cooperates with a brake disc
Data Source
AI summary
A sunken wheel-side motor drive axle that includes an axle beam assembly, two drive motor assemblies, two reducer assemblies and two hub assemblies. The two drive motor assemblies, two reducer assemblies and two hub assemblies are respectively disposed at left and right ends of the axle beam assembly. Moreover, the drive motor assemblies are symmetrically disposed at a bottom of the left and right ends of the axle beam assembly respectively; and the drive motor assemblies transmit power to the reducer assemblies, and the reducer assemblies drive the hub assemblies to rotate.