"Editor's note" of Zhang 700bike, throw the product itself, but full of feeling, and belt drive back to our vision. NET author of Lei Feng is an experienced riding enthusiast, with chain drive and belt drive to talk to you about those things.
Because bicycle structural reasons, we tread on the power from the drive wheel (sprocket wheel) to the gear (flywheel on the rear wheel) in the machinery industry, for such a large center distance of the transmission methods common chain and belt drive two (hereinafter referred to as the chain drive or belt drive).
Why, then, in the cycling world, but the vast majority of bicycles using chain drive, little belt drive products?
First of all, let us take a look at the structure transmission in two ways.
By drive sprocket chain drive and driven sprockets and composed around two rounds of closed chains, chain and sprocket gearing to transmit motion and power between. GUCCI case for iphone 6 plus
In our daily lives most common chain for roller chains. Roller chain from the Board, outside the chain within the chain plates, pins, bushings and rollers, and inner chain plates and sleeves, outer chain plates are fit with the pins, bushings and pins for clearance fits, forming a join. Relative deflection between the inner and outer link when the sleeve is free to rotate around the PIN. In order to reduce the wear between pin and sleeve, lubrication should be carried out in between them. Roller Looper out of the sleeve, mesh along the sprocket tooth profile roller when scrolling in order to reduce the wear between the chain and sprocket teeth. Inner and outer chain plates are usually 8-shaped so that the cross section of the plate roughly the same tensile strength and reduces weight and inertia force of the chain.
See roller chain and sprocket structure it is not difficult to understand the advantages and disadvantages of chain drive.
Advantages of chain drive:
1, the presence of a large center distance power transmission.
2, at low speed and heavy load and high temperature conditions, such as non-ideal working environment.
3 featuring a precise, reliable, higher transmission power.
4, little tension, shaft and bearing the burden of load is low.
5, high transmission efficiency, up to 95%~98%.
Although the chain has very obvious advantages, but the disadvantage is obvious:
1, because the presence of lubricating oils, chain easily, maintaining and cleaning is a hassle.
2, are usually steel, rust.
3, improper maintenance and wear will increase, seriously affecting life.
4, chain and chain length an integer multiple of the number unable to adjust length.
Center is far from power transmission, in addition to outside the chain drive, common in the industry another form of transmission is belt driven, usually by the driving wheels, gear and tensioning ring belt in two rounds.
Compare with chain transmission is mainly driven by meshing force, a common transmission is usually caused by the tension of the belt or friction between master and slave gear to drive.
While the length can be freely selected, structure is relatively simple, but if the belt tension is not enough, the belt it is easy to slip, which dangerously in the bike. If tension put on the shaft and bearing larger force, will reduce the efficiency of transmission.
(Gates Carbon Drive synchronous belt drive systems)
On the bike, we need another special belt drive system: synchronous belts (hereinafter referred to as synchronous belt).
Synchronous belt drive consists of a closed ring of the root surface evenly spaced teeth belt and toothed belt wheel composition, operation, with convex tooth belt pulley grooves mesh, to transmit motion and power, with the chain drive is different in essence.
Compared to conventional belt drive systems, timing belt belt has the following advantages:
1, when sliding has the exact transmission ratio.
2, high transmission efficiency, up to a maximum of 98%.
3, transmission ratio range, simple structure.
4, low noise, good wear resistance, without oil lubrication, also works in a harsh environment, virtually maintenance-free.
Timing belt not only has the advantage of chain drive, also has many chain of transmission does not have quiet operation, maintenance, and more prominent advantages, but why the timing belt but has not been widely used for what in the bike?
In the category of exercise bikes, synchronous belt drive systems are widely used not the reason seems simple. Multilevel transmission system used in the sport bike, chain, derailleur and Zhang Lianqi's role before the next, can give the driver brings a wide range of gear ratios to meet the needs of different road conditions.
(Bike chain drive system)
While chain bending angle, slightly skew the used belt features do not have.
In addition, belt-type transmission due to material limitations and need strength, could not be done and narrow like a chain, strong, and belt drive, from the wheels of the plane to keep in the same plane, otherwise it will cause belt wear and even fall off. Synchronous belt transmission usually occurs only in a single-speed transmission on the bike, although there are a number of multistage speed can be achieved through a single-speed transmission system, but due to the complex structure of variable speed, heavy weight and low transmission efficiency, at the more expensive price and other reasons have not been widely applied.
But why single speed, belt drive products are numbered? Perhaps from the Gates Carbon Drive belt drive systems, we can get an answer.
Gates is a newly involved in the bike industry's old belt transmission provider, Gates Carbon Drive systems is a Gates belt drive system specifically developed for bicycle, Friction abroad Facts (friction) on the transmission system efficiency testing, Gates Carbon Drive belts typically only 1W power consumption more than chain drive, 208W and belt system will become more efficient.
This transmission efficiency difference for most cyclists don't feel any difference. But we cannot ignore the other details, the typical tensile strength of chain drive for 2 pounds, while Gates Carbon Drive belt drive system tensile forces to 85 points in order to prevent skidding when punches. (Imagine your bike in the shaft and rear always has a pull of 40 kg, the frame could feel how cool acid? ）
As a popular means of transport, bicycle design simplicity and low cost, high tensile forces for using chain drive frames are a big test. And with the existing large number of quantitative production of low cost compared to the chain drive system, whether it is to replace the entire transmission system or a tensile force for high again redesigned the frame will eventually lead to rising business costs.
In General, efficiency is not a problem, cost is what allows many bicycle manufacturers to abandon the main cause of a belt drive system. GUCCI case for iphone 6 plus
At present, the application of belt-driven bicycle final analysis due to lack of development manufacturers less mature, perfect facilities, resulting in high costs.
But quiet, lightweight, reliable and maintenance-free advantages have attracted many companies set out to develop the low cost of a belt drive system, so we can expect, when after the mature technology and mass production, such as problem solving, belt-driven bicycle of mass production is just a matter of time.
231 votes
700bike street bike
Frame Shang, used double conduction structure and "h" shaped not symmetric Hou Shang fork design; seat pad Shang, using Super fiber leather, increased has seat wide, upgrade riding line comfortable degrees; selection automatically within speed drum, can according to riding line speed automatically switch document bit; custom of cave pulled anti-puncture tire, solution glass, and nail caused of tied tire and burst tire problem; put State location used embedded type display, through and 700Bike App connection, achieved
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