Axle Assembly Bearing Support Wall for Pinion and Rotor Alignment
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Solution Overview
Problem
Existing axle assemblies with electric motor modules face challenges in efficiently supporting the drive pinion and rotor due to differences in material stiffness between the differential carrier and the bearing support wall, leading to potential misalignment and reduced durability.
Innovation Solution
The axle assembly design incorporates a bearing support wall made of a stiffer material than the differential carrier, which is either integrally formed or a separate component, to securely support the drive pinion and rotor, ensuring proper alignment and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the bearing support wall is made of a stiffer material than the differential carrier, then the alignment and support of the drive pinion and rotor is improved, but the manufacturing complexity and cost increase due to requiring multiple materials and additional assembly steps
Solution Approach 1:
The bearing support wall is separated from the differential carrier as a distinct component. This segmentation allows each part to be optimized independently - the differential carrier can be made from a lighter material while the bearing support wall uses a stiffer material specifically where needed to support the drive pinion and rotor, without requiring the entire differential carrier to be made from high-stiffness material.
Solution Approach 2:
The stiffer material is applied locally only where required - in the bearing support wall that directly supports the drive pinion and rotor - rather than throughout the entire differential carrier. This local quality approach provides the necessary alignment precision and support stiffness only at the critical locations while keeping other parts of the assembly lighter and less complex.
2Reliability
If the bearing support wall is made of a stiffer material, then the durability and preload force maintenance is improved, but the weight of the assembly increases
Solution Approach 1:
By separating the bearing support wall from the differential carrier, the stiffer and therefore heavier material is confined only to the bearing support wall where it is needed for durability and preload maintenance. The differential carrier can remain lighter, optimizing the overall weight-durability balance of the assembly.
Solution Approach 2:
The high-stiffness, high-density material is used locally only in the bearing support wall where structural integrity and preload force maintenance are critical. Other portions of the differential assembly can use lighter materials, reducing overall weight while maintaining reliability at the critical bearing support locations.
3Adaptability or versatility
If separate bearing support walls with different configurations are used for different gear ratios, then the adaptability of the differential carrier is improved, but the manufacturing complexity increases
Solution Approach 1:
The bearing support wall is designed as a separate, interchangeable component that can be swapped depending on the required gear ratio configuration. This segmentation allows the differential carrier to remain standardized while adapting to different applications by simply changing the bearing support wall component, rather than creating entirely different differential carriers for each gear ratio.
Solution Approach 2:
The standardized differential carrier design can support multiple gear ratio configurations by accepting different bearing support wall variants. This universality allows a single differential carrier design to serve multiple functions across different applications, reducing the need for entirely different carrier designs for each gear ratio while maintaining adaptability.
Data Source
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.