Rear Axle Tank Integration for Hybrid Vehicle Packaging
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Solution Overview
Problem
The existing multi-link suspension systems in motor vehicles are complex and bulky, making it difficult to integrate a bulky traction battery and fuel tank without encroaching on passenger compartment space, especially in hybrid vehicles.
Innovation Solution
The proposed rolling rear axle assembly features a connecting support with a rigid external wall that integrates the first and second crosspieces with the tank wall, including a third rear crosspiece, allowing the fuel tank to be fixed under the vehicle body via the first and third cross members, and incorporating a parallelepipedal reservoir that enhances structural rigidity and space efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a conventional rigid cradle structure is used to support the fuel tank and suspension components, then structural strength and stability are improved, but device complexity and space occupation increase
Solution Approach 1:
The patent merges the fuel tank with the central connecting support structure by integrating the tank into the cradle assembly. The tank is positioned within the cradle structure and secured to the cross members, combining two previously separate components (tank and support structure) into a unified assembly that reduces overall complexity while maintaining structural integrity
Solution Approach 2:
The central connecting support structure serves multiple functions: it provides structural support for the suspension system, acts as a mounting framework for the fuel tank, and creates a integrated assembly that reduces the number of separate components needed. This multi-functionality directly reduces device complexity while maintaining necessary strength
2Stability of the object's composition
If a conventional rigid cradle structure is used to support the fuel tank and suspension components, then structural stability is improved, but the space available under the vehicle body is reduced
Solution Approach 1:
The fuel tank is nested within the central connecting support structure, with the tank positioned inside the cradle assembly and secured to the cross members. This nesting arrangement allows the tank to occupy space within the existing structural framework rather than requiring additional external space, thereby maintaining structural stability while preserving underbody space for battery integration
3Ease of manufacture
If a conventional cradle structure is used in hybrid vehicles, then fuel tank support is achieved, but integration of traction battery and rear axle becomes difficult
Solution Approach 1:
The patent merges the fuel tank support function with the central connecting support structure, creating a unified assembly that simplifies the overall architecture. This merged structure provides clear mounting points (first front cross member and third rear cross member) for securing the tank, while the integrated design naturally creates space for battery placement, thereby improving both manufacturability and adaptability to hybrid vehicle configurations
Data Source
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AI summary
The invention concerns a wheeled rear axle assembly (10) for a motor vehicle comprising: - a central connection support (14) that comprises at least a first front crossmember (16) and a second crossmember (18) arranged behind the first front crossmember (16); - at least two articulations (42) each comprising at least two lower suspension arms (44, 52), each of which connects an associated steering knuckle (20) with one side of the connection support (14), each suspension arm (44, 52, 60) being mounted pivotably on the first and second crossmembers (16, 18) of the connection support (14); characterised in that the connection support (14) comprises at least one tank (12) delimited by a rigid outer wall, the first and second crossmembers (16, 18) being rigidly connected to each other via the wall of the tank (12).