There are certainly plenty of chainless concept bikes out there like the Stigo electric bike and the Sada hubless bike, which folds down to the size of an umbrella. Luckily, other types of chainless bikes that don't cost near as much have made it to market like the string bike and the hydraulic bicycle. The hydraulic bicycle I heard a lot about for many years but never actually got to see one launched to market until I recently came across someone in Russia by the name of Ziv Brosh who has actually built a proper working hydraulic bike that he'll be launching to market.
He calls it ChainFree and it's powered by hydraulic oil and works based on the rotation of a crankshaft connected to a hydraulic pump that builds enough pressure for the rear wheel hydraulic motor to operate. This hydraulic bike actually allows automatic and continuous sequential transmission, which is pretty cool!
Here is a video below As far as the stringbike, the inventor behind it is based in Hungary and goes by the name of Mihaly Lantos. The Stringbike works by having a lever pivot when pushing down on a pedal, and pulleys attached to the lever go forward pulling the cables with them to propel the back wheel.
From wooden scooter-like bicycles with no pedals to string and hydraulic powered bicycles, the evolution of the bicycle is surely a fascinating one! I can only imagine how uncomfortable early bicycles without suspension nor pneumatic tyres had to be on cobbled stone streets!
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Invest in good quality Traditional backpacking has really come along way from the days The expression out with the old, in with the new is very fitting It does not come as a surprise that hit and run driving is more common than The biggest energy losses are simply due to the change in rotation direction — once at the crankset and once again at the rear hub. After 10km of riding or approximately an hour the shaft drive bike would be four minutes behind the chain drive bike watts power output.
Then again, chains and belts lose efficiency in wet or muddy riding conditions. Friction Facts has found a chain to be Or another way to look at it, a shaft in good conditions is as efficient as a chain in super muddy ones.
A shaft system also requires very heavy-duty components, resulting in a weight penalty of kilograms compared to a chain or belt drivetrain. These heavy components are absolutely necessary as shaft drivetrains undergo very high forces when a rider starts from a standstill.
This is a particularly big hurdle on shaft drivetrains as they use small radius bevel gears. It results in much higher forces and distortions when compared to chain or belt drive. Or to be more technical, the moment arm on a shaft drivetrain is approximately x shorter than a chain or belt cog, so it needs to be engineered to handle x more force. These high forces also put a lot of stress on the bearings and bevel gears, which can wear out very quickly if not engineered to the right specifications.
In order to reduce wear and increase drive efficiency, there is an optimal distance for the bevel gears to mesh. All bicycle frames flex under a load, but if a frame is not stiff enough for a shaft system, it can result in imprecise gear meshing. A proposed solution has been to use CV joints at both ends of the shaft.
This would allow the frame to flex, but would also introduce more friction, weight and complexity. A shaft system also needs to be constructed to very tight tolerances to achieve the optimal gear meshing, and additionally, the rear bevel gears need to be easily aligned by the user when installing the rear wheel. Gear alignment is a very solvable problem but requires the appropriate frame, manufacturing tolerances and way to achieve the optimal distance between bevel gears. Thursday, 11 November, Trending Tags inventions Future Maker Experiments.
Trending Tags. All Stories of Innovation Young Phenomena. All Environment Health Tourism. All Inventions Inventors Stories. Newsstand Subscribe Account Menu. Home Gadget. Driven: the first chainless bicycle comes from Denmark by Alessio Iannicelli. Condividi su Facebook Condividi su Twitter. How does Driven, the first chainless bicycle, work? Tags: Bicycle chain chainless engineering Environment health news startup transports. Share Tweet Share Send. Related Posts.
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