Motorcycle Mount Anti-Rotation Pin Shear Mechanism
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Solution Overview
Problem
Conventional vehicle mounts for motorcycles often fail to securely attach portable devices due to loose threaded connections, which can lead to dangerous situations during use and potential injury in accidents, as they may dislodge and become projectiles.
Innovation Solution
The vehicle mount incorporates anti-rotation pins that seat within cavities, providing resistance to relative movement under normal conditions but shearing under severe forces, allowing the mount to 'give way' and prevent dislodgment of devices during accidents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If threaded connections are used to secure the mount components, then the mount can be easily assembled and disassembled, but the connections can loosen over time due to vibration and jarring
Solution Approach 1:
The connection system is divided into two independent functional elements: threaded fasteners for assembly/disassembly operations and anti-rotation pins for maintaining connection stability during vibration. This segmentation allows each element to optimize its specific function without compromising the other.
Solution Approach 2:
The anti-rotation pins create an asymmetric constraint system that prevents rotational loosening of the threaded connections. The pins are positioned to provide non-uniform rotational restraint, effectively counteracting the loosening tendency caused by vibrational forces.
2Adaptability or versatility
If threaded connections are used to secure the mount components, then the mount can be adjusted to different positions, but the connections may become loose and cause the mount to pivot to undesirable positions
Solution Approach 1:
The positioning system is segmented into adjustable threaded connections that enable position changes and anti-rotation pins that maintain positional stability. The pins are strategically placed to prevent unwanted pivoting while allowing intentional adjustment when needed.
Solution Approach 2:
The system allows changes in positional parameters through the threaded connections during normal operation, while the anti-rotation pins maintain the stability parameter by preventing unintended rotational movement that would alter the mount position.
3Reliability
If the mount uses strong connections to prevent dislodgment, then the device is securely attached, but in an accident the mount may become a projectile and cause injury
Solution Approach 1:
The anti-rotation pins are designed to shear at predetermined locations under extreme force, converting the harmful effect of severe accidents into a beneficial safety feature. The controlled failure of the pins allows the mount to detach safely rather than becoming a dangerous projectile, while still providing secure attachment during normal operation.
Solution Approach 2:
The pin design incorporates predetermined shear locations that act as built-in weak points, providing beforehand cushioning against the harmful effects of severe impacts. This pre-planned failure mechanism protects against the worse outcome of the mount becoming a projectile during accidents.
4Reliability
If anti-rotation pins are added to prevent loosening, then connection stability is improved, but the device complexity increases
Solution Approach 1:
The anti-rotation pins are designed as simple, inexpensive components that can be easily manufactured and installed. Their simplicity and low cost mean that even though they add to the component count, the overall device complexity increase is minimal while the reliability benefit is significant.
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
The anti-rotation pin system effectively secures devices during normal operation while ensuring that in the event of an accident, the mount components rotate rather than separate, preventing the device from becoming a projectile and reducing the risk of injury.
Implementation Method 1
The anti-rotation pin connections help resist relative movement at such locations under normal operating conditions of the vehicle
Implementation Method 2
These pin connections help resist relative movement at such locations under normal operating conditions of the vehicle, but may be severed in response to the application of a severe force to the mount
Data Source
AI summary
A mount for motorcycles and other vehicles is provided that resists relative rotational movement at the connection between the mount and the vehicle, and at the connection between the mount and a plate that supports a portable device such as a GPS, toll transponder, radar collector and the like, while permitting disengagement at such connections in response to the application of a force to the mount.