What are the advantages and disadvantages of timing belts?
The timing belt has been applied in the engine for a long time, the technology is mature, the cost is low, and the noise is small, but it needs to be checked and maintained regularly. Normally, the belt needs to be replaced within 50,000 to 100,000 kilometers. The timing chain has significant advantages such as compact structure, high transmission power, high reliability and wear resistance, and lifetime maintenance-free, but the noise is generally slightly larger than the conventional timing belt. But nothing is absolute. With the advancement of technology, some cars use a toothed muted chain, and the noise is even lower than the timing belt. It is believed that the wide use of this timing chain will bring more convenience to the majority of automotive users.
The common timing chain is mainly divided into two types: sleeve roller chain and toothed chain. Among them, the roller chain is affected by its innate structure, the rotation noise is more obvious than the timing belt, and the transmission resistance and inertia are also relatively large. Our commonly used “silent chain” adopts a toothed structure design. When the gear is driven, the teeth are softer, the impact is smaller, the operation is also more stable, and in addition, there is no chain roller structure that will generate noise, so the noise level performance It is better than the traditional timing belt.
The fact that the timing belt is not broken does not mean it has no problem. As the belt becomes more and more used, the extent of its stretching tends to exceed the range that the tensioning device can compensate, thus producing a timing sprocket slip. The wear of gear teeth, the presence of lubricating oil, etc. can also lead to slipping. During the inspection, if the belt has a phenomenon of reduced hardness, abrasion, fiber breakage, or cracks or cracks, it indicates that the belt has been damaged and cannot be used. Next, check the sprocket failure. Damaged sprockets can "burn" the belt material and aggravate belt tooth wear. Sprocket failure may also cause the valve train to produce greater resistance to the timing belt.