Rear Fender Bending Structure for Saddle-Ride Vehicle
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Solution Overview
Problem
The existing rear structure for saddle-ride type vehicles, where the tip end portions of the sidewall are engaged with the bottom portion, fails to effectively utilize the space on the bottom portion of the rear fender.
Innovation Solution
A rear fender structure with a bottom portion and integrally formed bending portions that can be bent upright to form a second side portion, allowing the tip ends to be free from engagement with the bottom, enabling the utilization of space and preventing inclining of the first and second side portions, with a joint portion covered to prevent water entry and electrical components positioned lower to lower the vehicle's center of gravity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the tip end portions of the sidewall portions are engaged with the bottom portion, then the manufacture of the rear fender is facilitated, but the space on the bottom portion cannot be effectively utilized
Solution Approach 1:
The sidewall portions are divided into first side portions extending upward integrally from the bottom portion, and bending portions that are bent upright to form second side portions. This segmentation allows the second side portions to be formed separately from the bottom portion, effectively utilizing the bottom portion space while maintaining ease of manufacture through integral formation.
Solution Approach 2:
The bending portions are bent upright from the bottom portion to form the second side portions, transitioning from a flat configuration to a three-dimensional structure. This dimensional change allows the second side portions to extend upward without occupying bottom portion space, resolving the contradiction between manufacturing ease and space utilization.
2Area of stationary object
If the second side portion is formed by bending and standing the bending portion from the bottom portion, then the space on the bottom portion is effectively utilized, but the first side portions and the second side portion may incline relative to the bottom portion
Solution Approach 1:
The first side portions and second side portions are joined together at joint portions where they partially overlap in the lateral direction of the vehicle. This merging creates a unified structure that prevents inclining of the side portions relative to the bottom portion while maintaining effective utilization of the bottom portion space.
Solution Approach 2:
The joint portions act as intermediary elements connecting the first side portions and second side portions. These joint portions provide structural support and alignment, preventing inclining while allowing the bending portions to be formed separately from the bottom portion.
3Object-affected harmful factors
If the joint portion is covered with a cover member, then water entry through the joint portion is prevented, but the structure complexity increases
Solution Approach 1:
The cover member acts as an intermediary element that covers the joint portions where the first side portions and second side portions are joined. This simple covering structure effectively prevents water entry through the joint portions without significantly increasing the overall structure complexity.
Data Source
Figure 1
Figure 2
Figure 3(a)~3(b)
AI summary
A rear structure for a saddle-ride type vehicle includes a rear fender (10) configured to cover an upper side of a rear wheel WR, in which the rear fender (10) includes: a bottom portion (20) configured to face the rear wheel; a first side portion extending upward integrally from each of left and right portions of the bottom portion (20); and a bending portion (40) formed integrally with the bottom portion (20) to be bendable at a hinge portion (41) provided therebetween. The bending portion (40) can be bent and stood upright from the bottom portion (20), and joined to the first side portion (30) to form a second side portion (40). There is thus no need to engage a tip end of the bending portion (40) with the bottom portion (20), and this makes it possible to effectively utilize a space on a bottom portion of a rear fender.