Straddled Vehicle Frame with Segmented Coupling Members for Adjusted Rigidity
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Solution Overview
Problem
Existing straddled vehicle frame structures have limitations in adjusting riding comfort, as the degree of rigidity adjustment is restricted by changing the shape and material of the bridge, which may not meet the specific requirements of different vehicle types, leading to suboptimal riding experiences.
Innovation Solution
A straddled vehicle design featuring a body frame with adjustable coupling members (first, second, and third coupling members) and engine brackets, supported by bolts, allowing for customizable rigidity and deformation to achieve desired riding comfort by adjusting the shape and material of these components, enabling the production of various vehicle types using a common frame at a low cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the rigidity of the body frame is set high, then deformation of the body frame is suppressed and stable riding comfort is obtained, but operating the straddled vehicle requires skill to maintain high speed during turning
Solution Approach 1:
The body frame is divided into multiple coupling members (first, second, and third coupling members) that connect different portions of the main rails. Each coupling member can be independently designed with different rigidity characteristics, allowing the frame to provide overall stability while maintaining flexibility in specific areas for easier turning operation.
Solution Approach 2:
Different coupling members are designed with different rigidity properties to match the specific functional requirements of different frame sections. The first coupling member connecting front portions can have different rigidity characteristics than the second coupling member connecting middle portions, enabling localized optimization of both stability and maneuverability.
2Stability of the object's composition
If the rigidity of the body frame is set excessively high, then stable riding comfort is obtained, but operating the straddled vehicle requires skill in order to keep the speed high at the time of turning
Solution Approach 1:
The coupling members are designed to provide dynamic characteristics that allow the body frame to adapt to different operating conditions. The flexible connections enable the frame to deform slightly during turning operations, reducing the skill required to maintain speed, while still providing stable riding comfort during normal operation.
3Adaptability or versatility
If the shape and material of the bridge are changed to adjust rigidity, then riding comfort can be modified, but the degree of adjustment is limited and may not meet specific requirements of different vehicle types
Solution Approach 1:
Instead of modifying a single bridge component, the invention segments the frame into multiple coupling members that can be independently designed and selected. This allows for greater adaptability in achieving different rigidity levels and riding comfort characteristics without significantly increasing overall structural complexity.
Solution Approach 2:
The coupling members are designed to serve multiple functions: providing structural support, enabling rigidity adjustment, and facilitating the use of a common body frame across different vehicle types. By selecting different coupling member configurations, the same basic frame structure can be adapted to various vehicle requirements.
4Ease of manufacture
If a common body frame is used for multiple vehicle types with different bridge configurations, then manufacturing cost is reduced, but the degree of riding comfort adjustment is limited
Solution Approach 1:
The body frame is segmented into standardized components including multiple coupling members that can be mass-produced independently. This segmentation allows for cost-effective manufacturing of common frame parts while enabling customization through different coupling member selections to achieve various riding comfort levels for different vehicle types.
Solution Approach 2:
Different coupling members are designed with varying parameters such as material composition, cross-sectional shape, and connection methods. By changing these parameters while maintaining the same basic coupling member structure, the invention enables adjustment of riding comfort characteristics without requiring completely different frame designs, thus maintaining manufacturing efficiency.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration allows for tailored riding comfort by adjusting the rigidity of the frame components, enabling the manufacture of multiple straddled vehicle types at a lower cost while ensuring appropriate comfort for each type, as the degree of deformation affects the riding experience.
Implementation Method 1
a rear suspension connected to the second coupling member so as to at least partially absorb shock transmitted from the drive wheel to the rear arm
Data Source
AI summary
A main frame has a pair of left and right main rails that respectively include left and right front portions, left and right middle portions, and left and right rear end portions. One end portion of the left main rail and one end portion of the right main rail are connected to each other, whereby a head pipe is formed. A first coupling member is attached to the left and right front portions with a plurality of the first bolts, so that the front portions are coupled to each other. A second coupling member is attached to the left and right middle portions with a plurality of the second bolts, so that the middle portions are coupled to each other. A third coupling member is attached to the left and right rear portions with a plurality of the third bolts, so that the rear portions are coupled to each other.