Straddled Vehicle Footrest Support for Slanted Step Stiffness
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Solution Overview
Problem
Conventional straddled vehicles lack design freedom and material selection flexibility for footrests, particularly in supporting slanted portions, which limits design and maintenance options.
Innovation Solution
A straddled vehicle design featuring a main body frame with a first supporting frame connected to the main body frame to support the approximate center of a slanted footrest, allowing for improved design freedom and material selection, along with separate supporting frames for enhanced stiffness and serviceability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional frames support only outer side or horizontal portion of footrest, then structure is simpler, but design freedom and material selection flexibility are reduced
Solution Approach 1:
The supporting frame is divided into multiple independent portions: a first supporting portion supporting the outer side of the footrest, a second supporting portion supporting the horizontal portion from below, and a third supporting portion supporting the slanted portion from below. This segmentation allows each portion to be independently designed and optimized, enabling greater design freedom and material selection flexibility while maintaining structural integrity
Solution Approach 2:
The support structure transitions from two-dimensional (outer side and horizontal portion only) to three-dimensional by adding support for the slanted portion from below. This multi-dimensional approach enables comprehensive support of all footrest surfaces, allowing use of lightweight materials like resin while maintaining structural strength
2Weight of moving object
If footrest is made of resin to reduce weight and cost, then manufacturing cost and weight decrease, but structural stiffness may be compromised
Solution Approach 1:
The supporting frame is segmented into three distinct portions, each supporting a different surface of the footrest. This segmentation distributes the load across multiple support points, enabling the use of lightweight resin material while maintaining adequate stiffness through optimized support distribution
Solution Approach 2:
Different portions of the supporting frame can be designed with locally optimized properties tailored to specific support requirements. The first supporting portion handles outer side loads, the second handles horizontal portion loads, and the third handles slanted portion loads, allowing resin footrest to achieve required stiffness through localized support optimization
3Ease of repair
If first supporting frame is made as separate member from main body frame, then serviceability and component detachability improve, but assembly complexity increases
Solution Approach 1:
The supporting frame is designed as a separate, segmented component independent from the main body frame, allowing it to be manufactured, assembled, and maintained as a modular unit. This segmentation enables easy detachment and reattachment of the supporting frame and engine components through simple connection mechanisms
Solution Approach 2:
The supporting frame transitions from a fixed integral structure to a dynamic, detachable component that can be easily assembled and disassembled. This dynamic design allows engine and other components to be attached and detached conveniently while maintaining structural integrity during operation
Data Source
AI summary
A vehicle including: a main body frame; a seat provided on the main body frame; a pair of front wheels provided at a front portion of the main body frame; a pair of rear wheels provided at a rear portion of the main body frame; a pair of footrests respectively provided on two sides of the seat in a plan view of the vehicle, each of the footrests having a first step and a second step, the second step being provided behind the first step and extending diagonally upward and rearward; and a pair of first supporting frames connected with the main body frame and respectively supporting approximate centers of the pair of second steps from below.