Straddle Vehicle Leg Shield Overlap Fastening Rigidity

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Solution Overview

Problem

Existing straddle type vehicles face challenges in reducing weight while maintaining rigidity, particularly in the design of the leg shield which often requires multiple parts and lacks efficient structural integration for improved running performance.

Innovation Solution

The design incorporates an overlapping portion between the front cowl and the upper and lower members of the leg shield, secured with fasteners, which enhances the rigidity of the body cover and allows for the formation of storage spaces with fewer parts, improving the vehicle's structural integrity and running performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the leg shield is composed of multiple members to form storage spaces, then the storage function is improved, but the device complexity and weight increase

Engineering Contradiction:

Improvestorage functionVSAvoidnumber of parts

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent combines the storage space formation with the leg shield structure itself by making the upper member extend rearward to form the storage space boundaries, rather than adding separate storage components. This merging approach provides storage functionality while reducing the number of discrete parts.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The upper member of the leg shield serves multiple functions: it provides structural shielding for the rider's legs and simultaneously forms the boundaries of the storage space by extending rearward. This multi-functionality reduces the need for separate components for storage.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Adaptability or versatility

If the leg shield is composed of multiple members, then the storage function is improved, but the weight increases

Engineering Contradiction:

Improvestorage functionVSAvoidvehicle weight

Core Design Contradiction:

Adaptability or versatilityVSWeight of moving object

Solution Approach 1:

The storage space is formed by the extension of the upper member itself rather than adding separate storage containers or compartments. This merging of storage function into the existing structure adds minimal weight while providing useful storage capacity.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The upper member is designed as a thin-walled structural component that forms the storage space boundaries without requiring thick or heavy materials, achieving storage functionality with minimal weight addition.

Inventive Principle:

Principle #30Flexible shells and thin films

3Strength

If the front cowl and leg shield are integrated with overlapping portions secured by fasteners, then the rigidity is improved, but the device complexity increases

Engineering Contradiction:

Improvebody cover rigidityVSAvoidfastening structure

Core Design Contradiction:

StrengthVSDevice complexity

Solution Approach 1:

The body cover is divided into separate front cowl and leg shield components that can be manufactured and assembled independently, with the overlapping portion providing structural connection. This segmentation allows for simplified manufacturing while maintaining rigidity through the overlap-fasten connection.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The front cowl and leg shield overlap in such a way that one component partially covers the other, creating a nested arrangement that provides structural rigidity while using a simple fastening mechanism rather than complex joints.

Inventive Principle:

Principle #7Nested doll (Nesting)

Data Source

PatentEP2017168B1Straddle type vehicle

Publication Date: 2010.09.15 YAMAHA MOTOR CO LTD

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AI summary

A front cowl (410), and an upper member (441) and a lower member (442) of a leg shield (440) have an overlapping portion (460), and such overlapping portion (460) is tightened up with fasteners. The rigidity of the body cover (400) can be improved by this arrangement. Also, the number of fasteners for tightening up the body cover (400) can be reduced, and the tightening-up process can be simplified.