Hi am Vipin Raushan Rai i would like to get details on chainless drive shaft system ppt ..My friend vicky said chainless drive shaft system ppt will be available here

chainless bicycle

A chainless bicycle is a bicycle that transmits power to the driven wheel through a mechanism other than a metal chain.A shaft-driven bicycle is a bicycle that uses a drive shaft instead of a chain to transmit power from the pedals to the wheel. Shaft drives were introduced over a century ago, but were mostly supplanted by chain-driven bicycles due to the gear ranges possible with sprockets and derailleurs. Recently, due to advancements in internal gear technology, a small number of modern shaft-driven bicycles have been introduced.

Shaft-driven bikes have a large bevel gear where a conventional bike would have its chain ring. This meshes with another bevel gear mounted on the drive shaft. The use of bevel gears allows the axis of the drive torque from the pedals to be turned through 90 degrees. The drive shaft then has another bevel gear near the rear wheel hub which meshes with a bevel gear on the hub where the rear sprocket would be on a conventional bike, and canceling out the first drive torque change of axis.

The 90-degree change of the drive plane that occurs at the bottom bracket and again at the rear hub uses bevel gears for the most efficient performance, though other mechanisms could be used, e.g. hobson's joints, worm gears or crossed helical gears.

The drive shaft is often mated to a hub gear which is an internal gear system housed inside the rear hub. Manufacturers of internal hubs suitable for use with shaft drive systems include NuVinci, Rohloff, Shimano, SRAM, and Sturmey-Archer.
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Abstract

A shaft-driven bicycle is a bicycle that uses a drive shaft instead of a chain to transmit power from the pedals to the wheel. Shaft drives were introduced over a century ago, but were mostly supplanted by chain-driven bicycles due to the gear ranges possible with sprockets and derailleurs. Recently, due to advancements in internal gear technology, a small number of modern shaft-driven bicycles have been introduced.

Shaft-driven bikes have a large bevel gear where a conventional bike would have its chain ring. This meshes with another bevel gear mounted on the drive shaft. The use of bevel gears allows the axis of the drive torque from the pedals to be turned through 90 degrees. The drive shaft then has another bevel gear near the rear wheel hub which meshes with a bevel gear on the hub where the rear sprocket would be on a conventional bike, and canceling out the first drive torque change of axis.

The 90-degree change of the drive plane that occurs at the bottom bracket and again at the rear hub uses bevel gears for the most efficient performance, though other mechanisms could be used, e.g. hobson's joints, worm gears or crossed helical gears.

The drive shaft is often mated to a hub gear which is an internal gear system housed inside the rear hub. Manufacturers of internal hubs suitable for use with shaft drive systems include NuVinci, Rohloff, Shimano, SRAM, and Sturmey-Archer.

Bike chains and their associated hassles keep many people from pedalling off on the world’s most efficient form of transport. We done what we can to highlight chain alternatives, such as drive belts, hydraulics, and one or two bikes using the intriguing shaft drives. Well, now we have happened upon the folk who seem to have the patent on these shaft drive transmissions. Sussex Enterprises, of Taiwan, reckon they’ve been making then for the past 15 years but it’s only since the advent of the Shimano Nexus 7 and 8 speed internal hubs that they have started to get some traction, so to speak. The aluminium casing hides 35° bevel gears that the pedals spin to rotate an aluminium shaft, which turn turns a gear at the other end connected the Nexus hub. No external crank, no chain, no derailleur, no grease and grunge. Dynamic, one of the distributors, have a wealth on info on how it all works and they figure the eight speed option is equal to 20 speeds from a standard geared bike, plus a constant 94% efficiency is claimed from a system that needs next to no maintenance.