Saddle-ride Vehicle Frame Triangular Reinforcement
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Solution Overview
Problem
The existing frame structure of saddle-ride type vehicles, particularly those with large load capacities, require additional reinforcing members to support the seat and storage box loads, leading to increased complexity and component size issues during delivery and storage, and necessitate additional reinforcement at joints between the down frame and rear frame.
Innovation Solution
The frame structure is reinforced by dividing the rear frame into front and rear half portions, with the rear frame rear half portions extending forward to join the cross frame, forming a triangular structure that supports the seat without a special reinforcing member, and integrating the down frame and rear frame front half portions to reduce component count and facilitate easier delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the cross frame and rear frames are reinforced to support large loads, then the load-bearing capacity is improved, but additional reinforcing members such as gusset plates are needed, increasing device complexity
Solution Approach 1:
The rear frame rear half portion is merged with the cross frame by having the extension part of the rear frame joined to the cross frame, forming an integrated triangular structure. This merging eliminates the need for separate gusset plates or reinforcing members, as the extended rear frame itself provides the reinforcement function, thus reducing device complexity while maintaining load-bearing capacity.
2Strength
If the down frame and rear frame are formed as a single large member, then structural integrity is improved, but delivery and component storage become difficult
Solution Approach 1:
The rear frame is segmented into a rear frame front half portion and a rear frame rear half portion, which can be manufactured and transported separately. The rear frame rear half portion is then joined to the front half portion to form the complete structure. This segmentation allows for easier delivery and storage of components while maintaining the structural integrity of the assembled frame.
3Ease of manufacture
If the down frame and rear frame are separate members joined by welding, then manufacturing flexibility is improved, but the joint requires additional reinforcing members for rear cushion loads
Solution Approach 1:
The rear frame rear half portion is extended in the longitudinal dimension to reach and join with the cross frame, creating a three-dimensional triangular reinforcement structure. This dimensional extension provides the necessary joint strength for rear cushion loads without requiring additional reinforcing members, while preserving the manufacturing flexibility of separate components.
4Strength
If the cross frame is made larger and stronger to support heavy seats and storage boxes, then load-bearing capacity is improved, but the vehicle width increases
Solution Approach 1:
The cross frame is designed with a curved profile rather than a straight rectangular shape. This curvature allows the cross frame to achieve greater structural strength and load-bearing capacity while maintaining a compact width, as the curved geometry distributes stresses more effectively without requiring increased dimensional size.
Data Source
Figure 1
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AI summary
A rear frame (R) extending rearward and upward from a down frame (A) is constituted by joining a rear frame front half portion (B) and a rear frame rear half portion (C) left and right rear frame front half portions (B) are connected by a cross frame (49); and the rear frame rear half portion (C) extends further forward from its joint with the rear frame front half portion (B) and is joined to the cross frame (49). The cross frame (49A) supports a seat (16) through a storage box (34).