Motorcycle Body Frame Pivot Hole Layout for Multi-Model Accuracy
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Solution Overview
Problem
The existing manufacturing methods for body frames in motorcycles require separate fabrication and adjustment for different types, leading to increased costs and dimension errors due to the need for additional supporting members and steps in the production process.
Innovation Solution
A manufacturing method that uses commonly designed main frame members with pivot holes and rotation restricting portions, allowing for the formation of pivot holes at predetermined positions specific to each type of vehicle, reducing the need for additional supporting members and simplifying the attachment process, thereby reducing costs and dimension errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a commonly designed body frame is used for multiple motorcycle types, then manufacturing cost is reduced, but the supporting position of the pivot shaft becomes less accurate due to dimension errors
Solution Approach 1:
The body frame is divided into a common main frame member and type-specific supporting members. The main frame member is standardized for cost reduction, while the supporting members are customized for each motorcycle type to ensure precise pivot shaft positioning. This segmentation allows the common structure to be mass-produced while maintaining precision through specialized components.
Solution Approach 2:
The supporting members are pre-designed and pre-positioned with precise pivot hole locations specific to each motorcycle type. By preparing these supporting members in advance with accurate positioning features, the final assembly achieves high precision without requiring complex adjustments during installation.
2Adaptability or versatility
If additional supporting members are added to the body frame, then the supporting position can be adjusted for different motorcycle types, but the device complexity and number of manufacturing steps increase
Solution Approach 1:
The supporting members are designed to serve multiple functions: they provide precise positioning for the pivot shaft, enable adjustment for different motorcycle types, and simplify the assembly process. Each supporting member is a multi-functional component that integrates positioning, mounting, and type-specific configuration into a single element.
Solution Approach 2:
The positioning function is extracted from the main frame member and incorporated into the supporting members. By taking out the precision positioning requirement from the common structure and placing it in the type-specific supporting members, the main frame can remain simple while still achieving accurate positioning through the attached supporting members.
3Adaptability or versatility
If supporting members are fitted into the body frame, then different motorcycle types can be produced from a common frame, but the number of manufacturing steps and fitting processes increases
Solution Approach 1:
The supporting members are pre-assembled with the pivot shafts and pre-positioned with all necessary alignment features before being installed on the main frame. This preliminary preparation ensures that when the supporting members are attached to the common frame, they fit directly without requiring complex adjustment or fitting procedures during final assembly.
Solution Approach 2:
The supporting members are designed with self-aligning features and self-positioning capabilities that allow them to automatically find their correct position on the main frame during assembly. This self-service design eliminates the need for complex measurement and adjustment procedures, thereby improving manufacturing efficiency.
Data Source
AI summary
A plurality of main frame members that are commonly usable for a plurality of types of straddled vehicles are fabricated. Left and light pivot shaft supporting portions are provided in each main frame member. The left and right pivot shaft supporting portions include left and right hole formable portions in which left and right pivot holes are formable and which have areas larger than an area of a head portion of a pivot shaft, respectively. One of the pivot shaft supporting portions includes a rotation restricting portion that restricts rotation of the head portion of the pivot shaft inserted into the pivot hole. The pivot holes are respectively formed at predetermined positions at pivot shaft supporting portions of each main frame member, and the predetermined positions are different in accordance with a type of a vehicle for which each main frame member is to be used.