Straddle Three-Wheeled Vehicle Frame Design
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Solution Overview
Problem
Current frame designs for straddle-type three-wheeled vehicles are either complex and material-intensive or lack the necessary strength for high-speed road use, and they do not adequately accommodate the unique space constraints and stability requirements of three-wheeled vehicles.
Innovation Solution
A frame design featuring an upper and lower frame member interconnected by forward and rearward cross members, with a strut extending diagonally to provide additional strength and attachment points, accommodating a double A-arm front suspension and a swing arm rear suspension, allowing for efficient mounting of components like the engine, air box, and fuel tank while maintaining accessibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a space frame or ladder frame is used, then the frame provides sufficient strength and rigidity, but the frame becomes complex and uses a large amount of material
Solution Approach 1:
The frame is divided into two main longitudinal members (left and right) that are simpler in structure, with cross members and bracing elements added only where structurally necessary. This segmentation allows each component to be optimized independently, reducing overall complexity while maintaining strength.
Solution Approach 2:
The longitudinal frame members serve multiple functions: they provide structural strength, act as mounting points for suspension components, and serve as attachment points for body panels and other vehicle components. This multi-functionality reduces the need for additional separate structural elements.
2Strength
If high strength metal alloys are used to increase frame strength, then the frame strength increases, but the manufacturing cost increases and additional processing steps are required
Solution Approach 1:
The patent changes the structural parameters of the frame (geometry, member distribution, bracing configuration) rather than relying solely on material parameter changes (high-strength alloys). This allows achieving the required strength through optimized structural design using conventional materials, avoiding costly materials and complex heat treatment processes.
3Device complexity
If the frame is designed for four-wheeled ATVs with McPherson suspension, then the frame structure is simpler, but it cannot adequately control roll and sway for three-wheeled vehicles
Solution Approach 1:
The frame design incorporates asymmetric bracing and cross member placement that is specifically tailored for three-wheeled vehicle geometry. The longitudinal members and cross members are positioned to optimize the triangular configuration inherent in three-wheeled vehicles, providing superior roll and sway control compared to symmetric four-wheeled ATV frame designs.
4Volume of moving object
If three-wheeled vehicles are used, then the vehicle configuration is more compact, but there is reduced space to accommodate components in the rear portion
Solution Approach 1:
The frame design utilizes vertical space and three-dimensional positioning to accommodate components. The longitudinal members are positioned to create optimized volume distribution, allowing engine, transmission, and other components to be arranged in a compact three-dimensional configuration rather than being constrained to two-dimensional layouts.
Data Source
AI summary
A straddle-type three-wheeled vehicle has a frame having an upper frame member, a lower frame member, a forward cross member interconnecting a forward portion of the upper frame member with a forward portion of the lower frame member, and a rearward cross member interconnecting a rearward portion of the upper frame member with a rearward portion of the lower frame member. A strut extends diagonally from the forward cross member to the lower frame member. The vehicle has an engine mounted to the frame. An air box of the vehicle has at least a portion thereof disposed above at least a portion of the engine. A fuel tank of the vehicle is disposed rearwardly of the air box.