Electric Drive Axle Assembly Segmentation and Sealing
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Solution Overview
Problem
Large off-highway machines with electric drive propulsion systems face challenges in serviceability due to the extreme size and weight of components, particularly in maintaining proper sealing between the electric drive motor and spindle assembly, which complicates maintenance and repair.
Innovation Solution
An axle assembly design featuring an electric drive motor housed within a central axle housing with a spindle assembly that includes an external connection and internal sealing engagement with the motor housing, utilizing a sealing member to create a sealed internal axle cavity and incorporating a lubrication system for component lubrication and heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the electric drive motor, final drive assembly, and wheel assembly are mounted on an axle as a unitized structure, then the structural integrity and stability are improved, but the serviceability deteriorates because removal of one component requires removal of the entire unitized structure
Solution Approach 1:
The axle assembly is divided into separable components: the electric drive motor can be independently removed from the axle housing, and the final drive assembly can be separately serviced. The motor housing includes an engagement face that interfaces with the axle housing, allowing the motor to be mounted independently rather than as part of a unitized structure, enabling individual component removal and maintenance without disassembling the entire assembly.
2Ease of repair
If the electric drive motors are mounted independently from the final drive assembly, then the serviceability is improved, but the sealing between components becomes more difficult to maintain
Solution Approach 1:
A sealing member is introduced as an intermediary element between the motor housing engagement face and the axle housing. This sealing member maintains effective sealing between the independently mounted electric drive motor and the axle housing, preventing lubricant leakage while allowing the motor to be serviced separately from the final drive assembly.
3Reliability
If a sealing member is used to seal the engagement face between the motor housing and spindle assembly, then the sealing effectiveness is improved, but the device complexity increases
Solution Approach 1:
A sealing member, in the form of a flexible sealing element, is used to seal the engagement face between the motor housing and the spindle assembly. This thin film-like sealing component effectively prevents lubricant leakage from the internal axle cavity while adding minimal structural complexity to the overall assembly.
Data Source
AI summary
An axle assembly includes an electric drive motor oriented along an axis and disposed within a central axle housing. The electric drive motor includes a motor housing having an engagement face perpendicular to the axis. A spindle assembly includes an external connection to the central axle housing and an internal engagement face that is perpendicular to the axis. A sealing member is in sealing contact with the engagement face of the motor housing and the internal engagement face of the spindle assembly.