Motorcycle Storage Box Support Rigidity via Triangular Frame
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Solution Overview
Problem
Conventional motorcycle storage box structures lack sufficient rigidity to effectively support vertical loads, leading to concerns about inadequate support and stability.
Innovation Solution
A motorcycle body frame design featuring a main frame extending obliquely downward, paired seat rails extending rearward and upward, and backstays connecting these rails to the main frame, creating a high rigidity triangular portion that supports the storage box with its bottom positioned above the connection point and attachment parts disposed forward and rearward of a vertical line, enhancing structural support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the storage box is supported by the rear frames extending upward and rearward from the main frame, then the storage box can be mounted on the motorcycle, but the rigidity for supporting vertical loads is insufficient
Solution Approach 1:
The support structure is divided into multiple attachment points: a front attachment part connected to the front portion of the seat rail and a rear attachment part connected to the rear portion of the seat rail. This segmentation distributes the vertical load from the storage box across two separate connection points, with each point bearing approximately half the load, thereby improving overall support rigidity and reliability
Solution Approach 2:
The attachment structure transitions from a single-point support to a distributed multi-point support system. By adding both front and rear attachment parts along the longitudinal dimension of the seat rail, the support configuration creates a more rigid triangular load path that effectively resists vertical loads applied to the storage box
2Area of stationary object
If the storage box is positioned low on the frame, then the vehicle width can be kept compact, but the rigidity for supporting the storage box is reduced
Solution Approach 1:
The attachment structure utilizes the longitudinal dimension of the seat rail by providing both front and rear attachment parts spaced apart along the rail's length. This longitudinal distribution creates a rigid triangular support geometry that enhances vertical load-bearing capacity without requiring an increase in the vehicle's lateral width
Data Source
AI summary
A motorcycle with an increased rigidity portion for supporting a storage box. A body frame includes a main frame extending rearward and obliquely downward from a head pipe. Left and right seat rails are connected to the rear portion of the main frame and extend rearward and obliquely upward. Left and right backstays extend between and are connected to the left and right seat rails and the rear end of the main frame. A storage box is disposed such that its bottom is positioned above a connection part of the main frame and the backstays, and the storage box has front and rear attachment parts secured to the seat rails. The front and rear attachment parts are separately disposed, respectively, forward and rearward of a vertical line that passes through the connection part.