Motorcycle Rear Frame Reduced-Width Design for Device Mounting
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Solution Overview
Problem
Conventional motorcycle frame designs face challenges in mounting devices like ABS units, GPS units, canisters, and batteries without increasing vehicle width, due to interference with existing pipes and frames, leading to inefficient assembly and potential stiffness issues.
Innovation Solution
A motorcycle frame design featuring a reduced-width rear frame portion with a closed-cross section structure allows for devices to be mounted on either side, reducing interference and enabling efficient placement without increasing vehicle width, while maintaining structural stiffness through adjustable plate thickness and rib reinforcement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If devices are mounted in conventional frame designs, then device mounting is achieved, but vehicle width increases and interference with pipes occurs
Solution Approach 1:
The patent transitions from lateral device placement (width direction) to longitudinal placement along the centerline (length direction). The rear frame portion is designed to extend forward beneath the engine, creating a narrow longitudinal space that accommodates devices without increasing vehicle width. This dimensional shift resolves the contradiction by utilizing the length dimension instead of the width dimension for device accommodation.
Solution Approach 2:
The rear frame portion is designed with non-uniform cross-sectional dimensions: narrow in the right-left direction (width) and extended in the forward-rearward direction (length). This local geometric optimization creates a specialized mounting zone that fits devices longitudinally while maintaining compact vehicle width, directly addressing the contradiction between device mounting capability and vehicle width.
2Adaptability or versatility
If devices are mounted near pipes and frames, then device placement is achieved, but assembly becomes difficult due to interference
Solution Approach 1:
The patent extracts devices from the conventional lateral mounting zones near pipes and frames, and relocates them to the dedicated longitudinal space of the narrow rear frame portion. This spatial separation eliminates interference between devices and surrounding pipes/frames during assembly, while the integrated frame design provides straightforward mounting interfaces, resolving the contradiction between placement flexibility and assembly ease.
3Strength
If conventional frame structure is used, then structural integrity is maintained, but stiffness issues arise when modifying for device mounting
Solution Approach 1:
The patent merges the device mounting function directly into the rear frame portion structure. The narrow rear frame portion is integrated as an inherent component of the vehicle frame, combining structural support with device mounting capabilities. This integration maintains overall structural integrity while providing dedicated stiff mounting zones for devices, resolving the contradiction between structural integrity and mounting adaptability.
Data Source
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AI summary
In a vehicle body frame (1) including a front frame portion (3) extending rearward from a head pipe (2), and a rear frame portion (5) extending downward or rearward from a rear end of the front frame portion (3), a forward portion of the rear frame portion (5), for example, a lumber frame (5), includes a reduced-width portion overlapping with a vehicle body center line extending in a forward and rearward direction when viewed from above, and having a shape in which a width in a rightward and leftward direction is smaller than a length in an upward and downward direction. Devices incorporated into the motorcycle, such as a canister, a battery, an ABS unit, and a suspension unit, are laid out in spaces lateral relative to the reduced-width portion.