What is roller chain

A roller chain is a type of chain used to transmit mechanical power. It is a type of chain drive and is widely used in household, industrial and agricultural machinery, including conveyors, plotters, printing machines, automobiles, motorcycles, and bicycles. It consists of a series of short cylindrical rollers linked together and driven by a gear called a sprocket, which is a simple, reliable and efficient power transmission device.

Roller chain standard

GB/T1243-1997 stipulates that roller chains are divided into A and B series, among which A series is used for high speed, heavy load and important transmission, which is more commonly used, and its main parameters are shown in the table. The chain number in the table is consistent with the corresponding international standard number, and the chain number multiplied by 25.4/16mm is the pitch value. B series is used for general transmission. The marking of the roller chain is: chain number one row number one chain link number one standard number. For example: 10A-1-86-GB/T1243-1997 means: A series roller chain, the pitch is 15.875mm, single row, the number of chain links is 86, and the manufacturing standard is GB/T1243-1997.
Application and transmission characteristics of roller chain

advantage

Compared with the belt drive, it has no elastic sliding, can maintain an accurate average transmission ratio, and has high transmission efficiency; the chain does not require a large tension force, so the load on the shaft and bearing is small; it will not slip, the transmission is reliable, and the overload Strong ability, can work well under low speed and heavy load.

shortcoming

Both the instantaneous chain speed and the instantaneous transmission ratio change, the transmission stability is poor, and there are shocks and noises during operation. It is not suitable for high-speed occasions, and it is not suitable for frequent changes in the direction of rotation.

Chain drive is widely used in various machinery in various industries such as agriculture, mining, metallurgy, petrochemical industry and lifting transportation. The power that the chain transmission can transmit can reach 3600kW, and it is usually used for power below 100kW; the chain speed can reach 30~40m/s, and the commonly used chain speed is below 15m/s; ~2.5 is suitable.

The invention of the roller chain

According to research, the application of chains in our country has a history of more than 3,000 years. In ancient times, the rural areas of our country used rollovers and waterwheels to lift water from low to high, similar to modern conveyor chains. In the "Xinyixiangfayao" written by Su Song in the Northern Song Dynasty, it is recorded that what drives the rotation of the armillary sphere is like a chain transmission device made of modern metal. It can be seen that my country is one of the earliest countries in chain application. However, the basic structure of the modern chain was first conceived and proposed by Leonardo da Vinci (1452-1519), a great scientist and artist in the European Renaissance. Since then, in 1832, Galle of France invented the pin chain, and in 1864, the British Slater sleeveless roller chain. However, it was the Swiss Hans Reynolds who really reached the level of modern chain structure design. In 1880, he perfected the shortcomings of the previous chain structure, designed the chain into the popular sleeve roller chain, and obtained the roller chain in the UK. chain invention patent.

Benefits of Roller Chains

1. The roller chain effectively transmits power

Because it won't slip. The speed ratio is fixed and absolute.

2. Roller chain compliance is 98%

Under good lubrication, the performance of any load is quite good. This function can be maintained in the service life limit.

3. Universality of roller chain

It can still operate effectively in harsh environments such as dirt, oil, and mixed gas. A single power source can drive multiple shafts at the same time, and the speed can be adjusted by means of ratchet gears.

4. The vibration absorption capacity of the roller chain

The chain itself is elastic, and when the oil film exists in each component, it can protect the shaft and motor from impact and strain.

5. Light weight and small space occupation

The width is narrow, and it can be installed in a very small space, and the space occupied by the unit transmission horsepower is small.

6. The roller chain is durable

Because the load is shared by many teeth on the ratchet gear, the force on each single gear is small to ensure the service life.

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