Skateboard Gear Transmission for Stable Low-Effort Propulsion
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Solution Overview
Problem
Existing skateboards are difficult to maneuver on horizontal floors and slopes using body twisting techniques, particularly for beginners who struggle to maintain balance.
Innovation Solution
A skateboard design incorporating a deck, truck, box, transmission, axle, wheels, bevel gears, unidirectional bearings, input and output gears, and an acceleration mechanism with epicyclic gearings that convert mild user movements into significant propulsion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the user twists his or her body significantly to move the skateboard, then the skateboard can be propelled, but it is difficult for beginners to maintain balance
Solution Approach 1:
The patent replaces the direct mechanical connection between user body movement and skateboard propulsion with a transmission system. The transmission system includes a pinion gear engaged with a rack on the truck, and bevel gears that transfer motion from vertical body twists to horizontal wheel rotation, enabling propulsion with minimal body twisting while maintaining balance
Solution Approach 2:
The transmission system acts as an intermediary between the user's body movement and the skateboard's motion. The pinion-rack mechanism and bevel gears serve as mediators that convert small vertical movements into effective horizontal propulsion, reducing the need for significant body twisting and improving balance stability for beginners
2Productivity
If a transmission system with multiple gears is added, then mild user movement can be transformed into considerable skateboard movement, but the device complexity increases
Solution Approach 1:
The transmission system is segmented into distinct functional components: a pinion gear for initial motion transfer, bevel gears for directional change and mechanical advantage, and an acceleration mechanism with additional bevel gears. This segmentation allows each component to be optimized for its specific function while maintaining overall system manageability
Solution Approach 2:
The transmission system incorporates dynamic elements including spring-loaded followers that engage and disengage gear teeth, and movable components that adapt to varying user input forces. This dynamic design allows the complex transmission system to respond naturally to different propulsion intensities, from mild user movements to more forceful pushes
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
Facilitates easy and stable propulsion of the skateboard by transforming gentle user actions into substantial movement, enhancing maneuverability and balance.
Implementation Method 1
the acceleration mechanism turns mild movement of the user into considerable movement of the skateboard
Implementation Method 2
The transmission includes a pinion and a driving bevel gear connected to the pinion so that they are rotatable with each other
Implementation Method 3
The unidirectional bearings respectively support the driven bevel gears on the hollow shaft
Data Source
AI summary
A rolling unit includes a truck, a box, a transmission, an axle, two wheels, a hollow shaft, two driven bevel gears, two unidirectional bearings, an input gear, an output gear and an acceleration mechanism. The truck is connected to a deck of a skateboard. The box is pivotally connected to the truck. The transmission includes a driving bevel gear connected to the pinion. The pinion is located out of the box and engaged with a rack of the truck. The driving bevel gear is located in the box. The wheels are connected to the axle. The hollow shaft wraps the axle. The driven bevel gears are engaged with the driving bevel gear. The unidirectional bearings support the driven bevel gears on the hollow shaft. The input gear is connected to the hollow shaft. The output gear is connected to the axle. The acceleration mechanism is arranged between the input and output gears.