Coaxial Electrical Bridge Driving System with Integrated Planetary Carrier
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Solution Overview
Problem
The existing electrical bridge driving systems for hybrid and electric vehicles face challenges in achieving a compact, cost-effective design with improved support structure, better stiffness, larger transmission ratio, and enhanced lubrication performance, due to complex structures and insufficient support for the input shaft and planetary carrier.
Innovation Solution
The proposed electrical bridge driving system features an integrated design with a transmission shaft, planetary gear apparatus, and differential mechanism, where the sun gear is supported by thrust bearings, and the planetary carrier is integrated with the differential mechanism case, reducing the number of components and simplifying the support structure, allowing for a more compact and efficient power transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the input shaft is supported by bearings on only one side, then the structure is simplified, but the support stiffness is insufficient
Solution Approach 1:
The patent merges the input shaft support function with the housing structure by integrating bearing seats directly into the housing. This combines the support function into the existing structure, avoiding additional complex support components while maintaining sufficient support stiffness through the rigid housing-bearing-input shaft connection path.
2Device complexity
If the planetary carrier and transmission gear are welded together, then the structure is simplified, but the manufacturing difficulty and cost increase
Solution Approach 1:
The patent merges the planetary carrier and transmission gear into a single integrally formed component. This eliminates the welding process entirely, reducing manufacturing difficulty and cost while simplifying the overall structure. The integral design ensures precise alignment and eliminates potential welding defects.
3Volume of moving object
If the transmission gear size is limited by the input shaft and planetary carrier, then the compact layout is achieved, but the transmission ratio is affected
Solution Approach 1:
The patent optimizes the transmission gear dimensions by utilizing the full radial and axial space available within the planetary carrier structure. By carefully designing the gear tooth geometry and optimizing the gear position in the three-dimensional space, the transmission ratio is maximized without increasing the overall compact layout dimensions.
4Strength
If more and larger bearings are used, then the support structure is improved, but the cost increases
Solution Approach 1:
The patent combines multiple bearing support functions into strategically positioned bearing seats integrated into the housing. This consolidation approach provides adequate support stiffness through optimized bearing placement and selection, reducing the total quantity and size of bearings required while maintaining structural integrity.
Data Source
AI summary
An electrical bridge driving system for a vehicle includes: an electric motor; a transmission shaft connected for co-rotation with the electric motor; a first gear provided on the transmission shaft; a second gear engaged with the first gear; a planetary gear apparatus, wherein the second gear is connected for co-rotation to an input end of the planetary gear apparatus; and a differential mechanism, wherein an output end of the planetary gear apparatus is connected for co-rotation to an input end of the differential mechanism. The second gear, the planetary gear apparatus, and the differential mechanism are coaxial. The electrical bridge driving system can have a larger transmission ratio in a compact space.