Forged Motorcycle Head Pipe Spaced Down Frame Attachment
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Solution Overview
Problem
Conventional vehicle body frames for motorcycles require complex mechanical working and increased material costs due to the need for a recessed groove shape in the head pipe for the down frame attachment, which also compromises welding quality and stability.
Innovation Solution
A vehicle body frame design where the down frame attachment portion is positioned in a spaced relationship from the main frame attachment portion, eliminating the need for a recessed groove and allowing for a simpler welding process, reducing material waste and increasing the size of the head pipe while ensuring high coupling strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the down frame attachment portion is positioned adjacent to the main frame attachment portion, then the head pipe size can be minimized, but the mechanical working becomes complicated and material waste increases
Solution Approach 1:
The down frame attachment portion is repositioned from an adjacent location to a lower location on the head pipe, utilizing the vertical dimension. This spatial reconfiguration allows the attachment portion to be positioned at a lower end of the head pipe rather than adjacent to the main frame attachment portion, thereby simplifying the head pipe structure while maintaining functional requirements
2Volume of moving object
If the down frame attachment portion is positioned adjacent to the main frame attachment portion, then the head pipe size can be minimized, but the material waste increases
Solution Approach 1:
The down frame attachment portion is repositioned from an adjacent location to a lower location on the head pipe, utilizing the vertical dimension. This spatial reconfiguration allows the attachment portion to be positioned at a lower end of the head pipe rather than adjacent to the main frame attachment portion, thereby simplifying the head pipe structure while maintaining functional requirements
3Volume of moving object
If the down frame attachment portion is positioned adjacent to the main frame attachment portion, then the head pipe size can be minimized, but the welding quality becomes unstable
Solution Approach 1:
The down frame attachment portion is repositioned from an adjacent location to a lower location on the head pipe, utilizing the vertical dimension. This spatial reconfiguration allows the attachment portion to be positioned at a lower end of the head pipe rather than adjacent to the main frame attachment portion, thereby simplifying the head pipe structure while maintaining functional requirements
Solution Approach 2:
The attachment portions are separated into distinct spatial locations: the main frame attachment portion is positioned at an upper end of the head pipe while the down frame attachment portion is positioned at a lower end. This segmentation prevents overlapping welding operations and eliminates the formation of double beads, thereby improving welding quality stability
Data Source
AI summary
A forged head pipe for a motorcycle frame is integrally formed and includes a main frame attachment portion, a pipe portion, and a lower extension extending downwardly from the pipe portion. A down frame attachment portion is provided on the lower extension, and is spaced away from the main frame attachment portion and the pipe portion. A down frame is welded to the down frame attachment portion by contacting the same without inserting the same. The down frame attachment portion is configured from a connecting portion, extending in parallel to the pipe portion, and an extension extending rearwardly from a lower end portion of the connecting portion. By eliminating an insertion socket, manufacturing cost is reduced, and welding quality is improved by spacing the down frame downwardly below the main frame attachment portion and the pipe portion, to which a high load is applied.