Axle Assembly Layout With Drop Gear Set for Thermal Balance
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Solution Overview
Problem
Current axle assemblies with electric motor-driven transmissions face challenges in efficiently managing torque transmission and gear ratios, leading to inefficiencies and potential thermal and mechanical issues due to the integration of electric motors and countershaft transmissions on the same side of the housing, which affects weight distribution, thermal management, and component longevity.
Innovation Solution
The axle assembly design incorporates a countershaft transmission with a drop gear set and differential assembly, allowing for multiple gear ratios with a single set of countershaft gears, thermally separates the electric motor from other components, and improves weight distribution by locating the electric motor and countershaft transmission on opposite sides of the differential assembly, reducing the number of gears and associated costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the electric motor and countershaft transmission are integrated on the same side of the housing, then the device complexity is reduced, but the thermal management deteriorates and weight distribution becomes unbalanced
Solution Approach 1:
The patent divides the housing into left and right sides, placing the electric motor on one side and the countershaft transmission on the other side. This spatial segmentation separates heat-generating components from each other, improving thermal management while maintaining integration within the single housing structure.
2Device complexity
If the electric motor and countershaft transmission are integrated on the same side of the housing, then the device complexity is reduced, but the weight distribution becomes unbalanced
Solution Approach 1:
The patent segments the housing into left and right sides, placing the electric motor on one side and the countershaft transmission on the other side. This spatial segmentation distributes weight more evenly across the housing, improving weight balance while maintaining integration within the single housing structure.
3Device complexity
If multiple gear ratios are achieved with a single set of countershaft gears, then the device complexity is reduced and manufacturing cost decreases, but the torque transmission efficiency may be compromised
Solution Approach 1:
The patent employs a dynamic gear selection mechanism where a selector member can engage different countershaft gears (first, second, or third) to provide multiple gear ratios. This dynamic switching capability allows the system to optimize torque transmission efficiency for different operating conditions while maintaining a single set of countershaft gears, reducing complexity compared to multiple fixed gear sets.
Data Source
Figure 1
Figure 2
Figure 3A
AI summary
An axle assembly having a drop gear set and a countershaft transmission. The drop gear set may operatively connect a rotor of an electric motor to a countershaft. The countershaft transmission may operatively connect the countershaft to a drive pinion. The electric motor and the countershaft transmission may be positioned on opposite sides of a differential assembly.