Straddle Vehicle Frame Shock Absorber Mounting Rigidity
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Solution Overview
Problem
The existing straddle-type vehicle body frames face a challenge in maintaining rigidity at the shock absorber mounting portion while keeping it small in size, which restricts the freedom in laying out constituent components, especially when riding on rough terrain.
Innovation Solution
The body frame design incorporates a shock absorber mounting portion with a U-shaped sectional shape, offsetting the extension/contraction axis of the shock absorber and distributing loads to interconnected cross tubes, ensuring rigidity without increasing weight or size, allowing for a more streamlined layout of components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the shock absorber mounting portion is made heavy and thick to ensure rigidity, then the rigidity at the mounting portion is improved, but the body frame size is enlarged
Solution Approach 1:
The shock absorber mounting portion is divided into multiple mounting points distributed across different locations (first and second mounting points at different heights and positions). This segmentation allows the load to be distributed across multiple attachment points rather than requiring a single large, thick mounting structure, thereby maintaining rigidity while reducing overall size.
Solution Approach 2:
The mounting portion utilizes three-dimensional spatial arrangement by positioning mounting points at different heights (upper and lower mounting points) and lateral positions. This dimensional distribution creates a rigid triangular or polygonal framework that provides structural strength without requiring excessive material thickness in any single location.
2Strength
If the shock absorber mounting portion is made heavy and thick to ensure rigidity, then the rigidity at the mounting portion is improved, but the degree of freedom in laying out constituent components is restricted
Solution Approach 1:
By segmenting the mounting portion into multiple discrete mounting points positioned at different locations, the design creates a modular framework that can accommodate various component arrangements. The distributed mounting points provide structural rigidity while leaving flexible spaces for positioning engine components, exhaust systems, and other vehicle constituents.
Solution Approach 2:
The three-dimensional distribution of mounting points creates spatial flexibility in component layout. By utilizing vertical and lateral positioning of mounting points, the design allows constituent components to be arranged in multiple configurations without compromising structural integrity, thereby enhancing design freedom.
Data Source
AI summary
A body frame of a straddle-type vehicle is provided with a first cross tube 21 for interconnecting left and right main frames 13 in a right-left direction, and a second cross tube 22 disposed rearwards of the first cross tube 21 and for interconnecting the of left and right main frames 13. A shock absorber mounting portion 23 is mounted so as to interconnect the first cross tube 21 and the second cross tube 22. An extension/contraction axis L1 of a shock absorber 41 and a line L2 passing through an axis of the first cross tube 21 and an axis of the second cross tubes 22 are offset in a side view of a vehicle in a right-left direction.