The Archimedes Drive is based on the same configuration as a planetary transmission, however uses friction instead of gear teeth to transmit torque. A planetary transmission uses the sun wheel in the center as the input. This sun wheel is surrounded by planet wheels, which are rolling over the teeth of a grounded output annulus. The difference in the speed of the planets moving around the drive compared to the input rotational velocity results in the desired gear ratio and an increase in torque.
This is a robust solution and used is for a countless amount of applications. However, the gear ratio of a single stage is limited relying on multiple drives in series. Our technology solves this by combining this with two other principles: the compound principle and tractional torque.
Best of all worlds
Combining the planetary configuration with traction torque transmission and the compound principle, means that the drive has two annuli and each planet has two diameters. With one annulus being fixed and the other the output. The sun wheel is used as input, driving the planet wheels. These planets are hollow and are compressed between the sun wheel and the annuli, generating the required force for tractional torque transfer.
Sky high ratio’s
The difference in diameter within the planets is largely responsible for the gear ratio. This makes it possible to produce drives with extremely high single stage ratios of up to 10,000:1, more than 25 times higher than what is available today.
|Type||Single stage Planetary Drive||Single stage Strain Wave Gear||Single stage Archimedes Drive|
|Max gear ratio||Medium||High||Very High|
Gears throughout history
The traditional wooden gearbox used in Dutch windmills made it possible to improve the lives of many. They allowed grain to be milled and made it possible to pump water, increasing food production and irrigation.
The herring bone gear was an instrumental innovation, it allowed the transferring of torque without producing an additional axial load. This sparked an industrial revolution allowing complex manufacturing processes to be simplified.
With almost no backlash, light weight and high single stage gear ratios, the strain wave gear pushed the boundaries of transmissions even further. While it made it possible to communicate with people on the moon, it also formed the foundation of robotics.
Like its predecessors, the Archimedes Drive will help initiate the fourth industrial revolution, drastically altering the world we live in today. With its numerous advantages, it will improve current technologies and enable new areas of innovation.