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The difference between chain drive and belt drive

2022-12-16

 The technical choice of the valve train determines the general characteristics of the engine design and has a significant impact on its construction. Most of the car engine gas distribution transmission mechanism adopts two transmission types of toothed belt and chain transmission technology. The selection of the most suitable valve transmission mechanism for a specific application should be based on the evaluation of the target specifications at the engine system level, and comprehensive consideration of friction loss, fatigue strength, maintenance, and changes in valve timing throughout the service life , dynamic performance, acoustic characteristics, quality, installation space and manufacturing costs and other factors.
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The gas distribution mechanism directly affects the fuel consumption of the engine through its friction loss, so the low friction design of the gas distribution mechanism is becoming more and more important. Compared with the bush chain and the roller chain, the toothed chain presents a larger friction Defects.
When the length of the engine must be the shortest, chain drive is better than belt drive; most gasoline engines and some diesel engines use hydraulic camshaft phase adjusters, and chain drive and wet belt drive are more cost-effective gas distribution drive schemes. The belt drive can achieve a high valve timing accuracy throughout the service life, which will become more and more important for future exhaust emissions and fuel consumption. Due to the higher and higher injection pressure, the torque of the fuel injection pump is very important for the belt and chain. The service life is decisive.
 
In order to achieve the best level of NVH, friction and dynamic performance, it is necessary to carefully design and optimize the shape of the belt curve, but it has nothing to do with the type of valve transmission, so there will continue to be tension between belt drive and chain drive competition.