In a new video, YouTuber Robert Murray-Smith presents a 3D printable model for an automatically operating CVT system (Continuously Variable Transmission). The underlying design is based on a patented mechanism for continuous torque transmission, in which centrifugal force and spring tension dynamically adjust the transmission ratio. The 3D model is available free of charge as an open source file via Thingiverse.
In his current project, Robert Murray-Smith demonstrates how key principles of power transmission can be reproduced on a small scale using 3D printing. The model presented depicts a continuously variable transmission system in which centrifugal weights, springs, ratchets and drive rods interact with each other. A central element is a mechanism that reacts to changes in rotational speed and load. The effective radius of the lever arms changes depending on the rotational speed – the transmission ratio adapts automatically. The design is based on an openly accessible patent, which is linked in the video.
The design is modular. All that is required are standard springs, round rods and printable plastic components. The building instructions are explained step by step in the video and the associated CAD files are available free of charge via Thingiverse. The system already works with two active units, but can be improved with additional modules. Additions such as a spring coupling could further stabilize the movement.
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