Motorcycle Rear Radar Layout for Tail Light Clearance
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Solution Overview
Problem
Straddled vehicles face challenges in integrating a radar on the rear portion without obstructing the tail light's emitted light and being susceptible to vibration due to limited space and low rigidity of rear fenders and seat cowl structures.
Innovation Solution
The radar is positioned on the seat frame, specifically arranged forward of the tail light, downward from the seat frame's upper end, rearward from the rear fender's front end, and upward from the rear fender's lower end, supported by a robust seat frame that minimizes vibration transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the radar is made larger to improve detection performance, then the radar detection capability is improved, but the radar blocks emitted light from the tail light
Solution Approach 1:
The radar is repositioned from the traditional rear fender area to the seat frame structure, utilizing the three-dimensional space above and behind the seat. This spatial relocation allows the radar to maintain its detection function while being positioned forward relative to the tail light, eliminating the light blockage issue.
2Ease of manufacture
If the radar is attached to the rear fender to simplify installation, then the ease of manufacture is improved, but the radar is influenced by vibration due to low rigidity of the rear fender
Solution Approach 1:
The radar is extracted from the rear fender mounting location and relocated to the seat frame. This separation removes the radar from the vibration-prone rear fender structure while maintaining ease of installation through the seat frame's integrated mounting points.
3Illumination intensity
If the radar is arranged upward of the tail light to avoid blocking light, then the tail light visibility is improved, but the radar is attached to the seat cowl which has low rigidity and is susceptible to vibration
Solution Approach 1:
The seat frame serves as an intermediary structure between the radar and the vehicle body. By mounting the radar on the rigid seat frame rather than directly on the tail light assembly or rear fender, the system achieves both good tail light visibility and reduced vibration influence through the seat frame's structural properties.
4Object-affected harmful factors
If the rigidity of the rear fender is increased to reduce vibration influence on the radar, then the vibration resistance is improved, but the size and weight of the rear fender increase
Solution Approach 1:
Instead of modifying the rear fender to increase its rigidity, the radar is extracted from the rear fender mounting location and relocated to the seat frame. This approach achieves vibration reduction without requiring any changes to the rear fender's weight or size.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This arrangement allows for a larger radar without blocking tail light visibility and reduces vibration influence, ensuring stable operation and compact integration.
Implementation Method 1
The radar includes a transmitter that transmits radio waves, a receiver that receives radio waves (reflected waves) that have been reflected off objects such as other vehicles
Implementation Method 2
a receiver that receives radio waves (reflected waves) that have been reflected off objects such as other vehicles
Data Source
Figure 1
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AI summary
A motorcycle (1) includes a radar (20) including a transmitter (21) that transmits radio waves, a receiver (22) that receives radio waves, and a casing (23) that houses the transmitter (21) and the receiver (22). The radar (20) is supported on a seat frame (10). At least a portion of the radar (20) is arranged forward relative to a rear end (14b) of a tail light (14), downward relative to an upper end (10t) of the seat frame (10), rearward relative to a front end (12f) of a rear fender (12) and upward relative to a lower end (12d) of the rear fender (12).