Motorcycle Grab Bar Attachment via Under-Seat Extraction
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Solution Overview
Problem
Existing motorcycle grab bar designs require increased size and weight for sufficient attachment strength and rigidity, leading to higher costs and a compromised external appearance due to visible notches for attachment sections.
Innovation Solution
A grab bar design with attachment sections that extend through a space below the rear seat toward the front and connect to the body frame, eliminating the need for notches on the side covers and minimizing wall thickness, while incorporating expanding sections and a projecting section for enhanced rigidity and aesthetics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the attachment sections are made larger and thicker to secure sufficient attachment strength and rigidity, then the attachment strength and rigidity are improved, but the weight and cost of the motorcycle increase
Solution Approach 1:
The attachment sections extend in the vehicle width direction (lateral dimension) rather than increasing thickness in the vertical dimension. This dimensional shift allows the attachment sections to achieve sufficient rigidity through increased span and attachment points to the body frame, while maintaining a slender profile that does not increase weight
Solution Approach 2:
The attachment sections are divided into left and right separate components that can be independently attached to the body frame. This segmentation allows for optimized distribution of attachment forces and enables the use of thinner individual sections while maintaining overall structural integrity through the distributed attachment architecture
2Strength
If the attachment sections extend inward through notches in the side covers, then the attachment strength is improved, but the external appearance deteriorates due to visible notches
Solution Approach 1:
The attachment sections are extracted from the visible exterior region and repositioned to extend through the space below the seat toward the front. This extraction removes the attachment sections from the aesthetic field of view, eliminating the need for notches in the side covers and preserving the smooth external appearance of the motorcycle
Solution Approach 2:
The attachment sections are repositioned to extend in the vehicle front-rear direction through the space below the seat, rather than extending inward through the side covers. This dimensional repositioning places the attachment mechanism in a hidden zone beneath the seat, where it does not affect the external appearance while still providing secure attachment to the body frame
Data Source
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AI summary
The present invention relates to a motorcycle, comprising a body frame, a seat supported by the body frame, and a grab bar having a grab main body to be grabbed by a rider and at least one attachment section, with which the grab body is attached to the body frame, wherein at least one attachment section extends through a space below a rear end of the seat toward the front, and is connected with the body frame below the seat.