Motorcycle Main Frame Pivot Hole Layout for Multi-Model Production
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Solution Overview
Problem
The existing manufacturing methods for body frames of straddled vehicles require separate fabrication for different types of motorcycles to achieve desired riding comfort, leading to increased costs and dimension errors due to the need for adjustable pivot shaft positions and additional supporting members.
Innovation Solution
A manufacturing method that fabricates common main frame members with pivot holes and rotation restricting portions, allowing for the formation of pivot holes at predetermined positions specific to each vehicle type, eliminating the need for additional spacers and reducing dimension errors, while enabling the use of a single frame design across multiple types of motorcycles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate body frames are fabricated for different types of motorcycles to achieve desired riding comfort, then riding comfort is improved, but manufacturing cost and device complexity increase
Solution Approach 1:
A single main frame member is designed with a hole formable portion that can accommodate pivot holes at multiple different positions, allowing the same frame to be used across different motorcycle types by simply repositioning the pivot hole within the formable portion, eliminating the need for separate frame designs
Solution Approach 2:
The main frame member is pre-designed with a hole formable portion that anticipates future pivot hole positioning needs, allowing pivot holes to be formed at predetermined positions according to different vehicle types without requiring frame modifications or additional supporting members
2Adaptability or versatility
If additional supporting members are added to adjust pivot shaft positions, then adaptability is improved, but dimension error increases
Solution Approach 1:
The function of adjusting pivot shaft position that was previously achieved through separate supporting members is extracted and integrated directly into the main frame member through the hole formable portion, eliminating the need for additional supporting members and their associated dimension errors
Solution Approach 2:
The position adjustment function and the frame structure are merged into a single integrated solution where the hole formable portion of the main frame member directly provides the pivot hole at the required position, removing the intermediate supporting members that caused dimension errors
3Adaptability or versatility
If multiple types of main frame members are fabricated, then adaptability to different vehicle types is improved, but manufacturing cost increases
Solution Approach 1:
One universal main frame member design with a hole formable portion serves multiple motorcycle types by allowing pivot holes to be formed at different positions within the formable portion, eliminating the need to manufacture multiple different frame types and reducing production costs
Data Source
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AI summary
A plurality of main frame members 1M that are commonly usable in a plurality of types of straddled vehicles are fabricated. Pivot shaft supporting portions 90L, 90R are provided in each main frame member 1M. Each of the pivot shaft supporting portions 90L, 90R includes a hole formable portion in which a pivot hole 91 is formable and which has an area larger than that of a head portion of a pivot shaft. One of the pivot shaft supporting portions 90L, 90R includes a rotation restricting portion that restricts rotation of the head portion of the pivot shaft inserted into the pivot hole 91. The pivot hole 91 is formed at a predetermined position in accordance with a type of a vehicle in each of the hole formable portions of the main frame member 1M. Positions of a plurality of pivot holes 91 of the plurality of main frame members 1M that are predetermined in accordance with the type of the vehicle are different from one another.