What is a chain drive? Chain drive is a transmission method that transmits the movement and power of a driving sprocket with a special tooth shape to a driven sprocket with a special tooth shape through a chain.
The chain drive has a strong load capacity (high allowable tension) and is suitable for transmission between parallel shafts over long distances (several meters). It can work in harsh environments such as high temperature or oil pollution. It has low manufacturing and installation accuracy and low cost. However, the instantaneous speed and transmission ratio of the chain drive are not constant, so the transmission is less stable and has a certain impact and noise. It is mostly used in mining, agriculture, petroleum, motorcycle/bicycle and other industries and machinery, and a large number of hardware, home appliances, and electronic industries. The production line also uses double-speed chains to transport tools.
The so-called double speed chain is a roller chain. The moving speed V0 of the chain remains unchanged. Generally, the speed of the roller = (2-3) V0.
Ordinary automation equipment rarely uses chain drives, because the load capacity requirements under general working conditions are not high, and more emphasis is placed on high speed, high precision, low maintenance, low noise, etc. These are the weaknesses of chain drives. Generally, the power shaft of the early mechanism design drives the equipment of multiple mechanisms through chain transmission. This “one axis, multiple movements” equipment mechanism model seems to have technical content, but it is not popular now (poor flexibility, inconvenient adjustment, high design requirements), because a large number of applications within the enterprise are mainly pneumatic equipment, and various mechanisms All have independent power (cylinder), and the movements can be easily controlled flexibly through programming.
What is the composition of the chain drive?
Chain drive is a transmission method in which the chain transmits power through the meshing of the rollers and the teeth of the sprocket. The parts involved in the chain drive include sprockets, chains, idlers and related accessories (such as tension adjusters, chain guides), which can be flexibly matched and applied according to the actual situation. Among them, the chain is composed of rollers, inner and outer plates, bushings, pins and other parts.
The important parameters of the chain drive cannot be ignored.
1. Pitch. The distance between the centers of two adjacent rollers on a roller chain. The larger the pitch, the larger the size of the parts, which can transmit higher power and bear greater loads (for low-speed and heavy-load roller chain transmission, the pitch should be selected large size). In general, you should choose a chain with the minimum pitch that has the required transmission capacity (if the single-row chain has insufficient capacity, you can choose a multi-row chain) to obtain low noise and stability.
2. Instantaneous transmission ratio. The instantaneous transmission ratio of the chain drive is i=w1/w2, where w1 and w2 are the rotation speeds of the driving sprocket and the driven sprocket respectively. i must meet certain conditions (the number of teeth of the two sprockets is equal, and the tight side length is exactly the integer of the pitch times), is a constant.
3. Number of pinion teeth. Appropriately increasing the number of pinion teeth can reduce motion unevenness and dynamic loads.
Post time: Sep-23-2023