Axle Assembly Layout With Nested Motor and External Gear Reduction
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Solution Overview
Problem
Existing axle assemblies with electric motor modules face challenges in optimizing package space, balancing, and efficient cooling, particularly when integrating gear reduction modules and differential assemblies.
Innovation Solution
The axle assembly design incorporates an electric motor module positioned inside the differential carrier, with a gear reduction module externally mounted, enhancing compactness and balance, and includes a cooling system with a water jacket to manage heat effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the electric motor module is positioned inside the differential carrier, then the axial length is reduced and compactness is improved, but the manufacturing complexity and assembly difficulty increase
Solution Approach 1:
The electric motor module is nested inside the differential carrier, with the motor positioned within the internal cavity of the carrier structure. This nesting arrangement allows the motor to occupy space that would otherwise be unused, reducing the overall axial length of the axle assembly while maintaining a compact configuration.
Solution Approach 2:
The axle assembly is divided into modular components including the differential carrier, electric motor module, and gear reduction module that can be manufactured separately and then assembled. This segmentation allows for specialized manufacturing of each component while enabling flexible assembly configurations to achieve the desired compact layout.
2Stability of the object's composition
If the gear reduction module is externally mounted, then the balance and compactness are improved, but the device complexity increases
Solution Approach 1:
The gear reduction module is mounted on the external surface of the differential carrier rather than being integrated within the internal cavity. This external mounting on a different dimensional plane (outer surface vs. inner volume) allows the motor to remain centrally positioned for balance while the gear module occupies external space, achieving both balance and compactness.
3Temperature
If the cooling system with water jacket is integrated, then the cooling efficiency is enhanced, but the manufacturing complexity increases
Solution Approach 1:
The water jacket cooling system is merged with the differential carrier structure, where the carrier serves dual functions as both a structural housing and a thermal management component. The water jacket is integrated into the carrier's wall structure, allowing coolant flow paths to be formed within the existing structural geometry, thereby enhancing cooling efficiency while utilizing the structural form already required for mechanical support.
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 reduces axial length, improves balance, and enhances cooling efficiency, allowing for a more compact and efficient axle assembly design.
Implementation Method 1
includes a cooling system with a water jacket to manage heat effectively
Data Source
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AI summary
An axle assembly and a method of manufacture. The axle assembly may include a differential carrier and a bearing support wall. The differential carrier may be made of a first material. The bearing support wall may be mounted to the differential carrier and may be made of a second material. The second material may have a greater stiffness than the first material.