Motorcycle Self-Supporting Shell Integrating Frame and Fuel Tank
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Solution Overview
Problem
Existing motorcycle frame structures are complex, costly, and not suitable for motorcycles with pendular rear suspension, requiring numerous parts that increase manufacturing and assembly costs and complicate maintenance, while also limiting tank volume optimization.
Innovation Solution
A self-supporting hollow shell integrates the steering column, engine, suspension system, and driver's seat, with closed hollow spaces forming a petrol tank, using a minimal number of structural parts to provide high rigidity and aesthetics, and featuring retractable access for engine maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If multiple shells and tie rods are used to form the frame structure, then the structural integrity is ensured, but the manufacturing cost and assembly complexity increase significantly
Solution Approach 1:
The patent combines multiple separate frame components (shells and tie rods) into a single integrated hollow shell structure. This monocoque design integrates the steering column, engine mounting, and suspension mounting functions into one unified structure, eliminating the need for separate connection parts and reducing assembly complexity while maintaining structural integrity.
Solution Approach 2:
The hollow shell serves multiple functions simultaneously: it provides structural support as the frame, contains fuel as a tank, and integrates mounting points for the engine and suspension system. This multi-functionality reduces the overall number of components needed in the motorcycle structure.
2Strength
If multiple separate parts are used for the frame structure, then the structural rigidity is maintained, but the manufacturing cost increases
Solution Approach 1:
The patent merges multiple manufactured parts into a single hollow shell component that can be produced as one piece. This reduces the total number of manufacturing operations, quality checks, and assembly steps required, thereby lowering manufacturing costs while maintaining the necessary structural rigidity through the optimized hollow section design.
3Strength
If the frame structure extends to the rear wheel, then the structural support is provided, but it becomes unsuitable for motorcycles with pendular rear suspension
Solution Approach 1:
The hollow shell is designed with segmented functional zones that provide structural support where needed while leaving open spaces for suspension components. The shell extends to provide support but is strategically designed to accommodate pendular rear suspension mechanisms without requiring the frame to extend all the way to the rear wheel.
4Adaptability or versatility
If additional parts are added to the hollow frame structure, then the functional requirements are met, but the tank volume optimization is limited
Solution Approach 1:
The hollow shell is designed as a multi-functional component where the same structural elements that provide frame support and mounting points also form the fuel tank boundaries. This integration allows the tank volume to be optimized within the available space defined by the shell's structural requirements, rather than being constrained by separate frame and tank components.
Data Source
AI summary
A motorcycle comprising a hollow self-supporting shell integrating the steering column, means for securing the engine and means for securing the suspension system, said shell having an inner space forming a petrol tank, said shell also including the driver's seat. Said shell has hollow spaces which are closed on either side of the median longitudinal vertical plane. The driver's seat is preferably formed by an extension of the hollow spaces.