Motorcycle Frame Rigidity via Integrated Reinforcing Flanges
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Solution Overview
Problem
Conventional motorcycle body frame structures lack sufficient rigidity and stability, leading to unwanted changes in vehicle behavior.
Innovation Solution
A body frame structure for motorcycles that includes a head pipe, right and left main frames, a down tube, and reinforcing frames with specific joint and flange portions that are welded together to enhance rigidity, featuring concavely curved body portions and boss portions for component mounting, and integrated third joint flange portions for improved stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the right and left reinforcing members are independently joined with the down frame, then the manufacturing process is simple, but the rigidity of the body frame is insufficient
Solution Approach 1:
The patent merges the right and left reinforcing members into a single integrated reinforcing frame structure. The right and left reinforcing frames are connected through a common down frame joint structure, creating a unified assembly that enhances overall rigidity while reducing the number of separate welding operations required.
Solution Approach 2:
The patent introduces a new dimensional aspect to the joint structure by adding a third joint flange portion that extends in the width direction of the vehicle. This additional dimension allows for integration of the right and left reinforcing frames through welding of the third joint flange portions, creating a three-dimensional joint structure that significantly improves rigidity.
2Reliability
If the reinforcing members are independently welded to the down frame, then the assembly process is straightforward, but the stability and behavior control of the vehicle body is insufficient
Solution Approach 1:
The patent combines the right and left reinforcing frames into a single integrated structure that is welded to the down frame as one assembly. This merging approach enhances vehicle body stability by creating a more rigid framework, while the modular design of the reinforcing frames allows for relatively straightforward assembly procedures.
Solution Approach 2:
The reinforcing frame is segmented into distinct portions (first joint portion, second joint portion with multiple flange portions, and body portion) that can be manufactured separately and then assembled. This segmentation allows for simplified manufacturing of individual components while achieving enhanced overall stability through the integrated assembly.
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
The enhanced body frame structure significantly improves rigidity and reduces changes in vehicle behavior, allowing for better handling and stability on uneven terrain.
Implementation Method 1
a second joint flange portion welded with an upper surface of the down tube; and a third joint flange portion that is connected with the first joint flange portion and the second joint flange portion and is separated from the down tube
Implementation Method 2
the third joint flange portion of the second joint portion of the right reinforcing frame and the third joint flange portion of the second joint portion of the left reinforcing frame are welded with each other to integrate the right reinforcing frame and the left reinforcing frame
Data Source
AI summary
A motorcycle body frame structure improves rigidity and further suppresses changes in vehicle body behavior. The body frame structure includes: a head pipe, right and left main frames connected to the head pipe, a down tube connected to the head pipe, right and left reinforcing frames installed between the down tube and corresponding right and left reinforcing frames. Each of the right and left reinforcing frames include a first and second joint portions joined to the down tube. The first joint portions are joined with corresponding right and left main frames. Each of the second joint portions include a first joint flange portion welded with corresponding right and left side surfaces of the down tube, a second joint flange portion welded with an upper surface of the down tube, and a third joint flange portion connected with the first and second joint flange portions and separated from the down tube.