Automotive engine timing chain

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We know that the main role of the engine timing belt is to drive the engine's air distribution mechanism so that the engine intake and exhaust valves are opened or closed at appropriate times to ensure that the engine cylinders can normally inhale and exhaust. In some models, such as the Volkswagen Jetta (EFI), Santana 2000, Polaris, Audi, etc., the timing belt also carries the task of driving the water pump.

With the continuous improvement of the technical level and industrial development of Rover, part of the timing belt of the engine has been replaced by the engine chain. Compared with the traditional belt drive, the chain drive method has reliable transmission, good durability and space saving. The entire system is composed of gears, chains and tensioning devices. The hydraulic tensioner can automatically adjust the tension, so that the chain tension is consistent and maintenance-free for a lifetime, which makes it the same life with the engine, not only safe, The reliability has been improved, and the use and maintenance costs of the engine have been reduced considerably.

For all engines, the timing belt must not jump or break. If the tooth jumping occurs, the engine will not work properly, and there will be phenomena such as unstable idling, poor accelerating, or failure to drive. If the timing belt breaks, the engine will immediately stall, and the multi-valve engine will also cause the piston to bend the top valve, which will seriously damage the engine as a whole.

Rubber Timing Belts As the engine operating time increases, belts and other accessories such as tensioners, tensioners, and pumps will wear or deteriorate. Therefore, all manufacturers equipped with timing belts will have stringent requirements to periodically replace timing belts and accessories within the specified period. The timing chain made of stronger steel can solve this problem. As we all know, the strength of metal is far greater than that of rubber, which leads to a significant reduction in the degree of deformation, jumping and breaking. The chance of happening is also minimal.


For a precision instrument like an engine, every mechanical component has strict technical and process specifications, which makes the operational quality requirements very high throughout the assembly process. The timing chain is an integral part of the car's core. Of course, it also has a certain degree of assembly difficulty. Some timing chains on the engine will have several obvious signs to ensure accuracy while reducing some of the installation. Difficulty.

Let's take a look at the advantages and disadvantages of timing chains compared to vintage belts in several ways. First, for manufacturers, the cost of producing timing chains is significantly higher than that of timing belts, and because the chains are all lifelong. Maintenance-free, and therefore the subsequent benefits of this part of the manufacturer will also be reduced, in addition, the timing chain compared to the belt will also have a certain impact on engine dynamics. We consider from the consumer point of view, due to the timing belt life limit, the user's follow-up car costs will increase, while the timing chain life and the same engine, so no need to replace, of course, there is no need to pay the relevant costs.


Finally, compare the advantages and disadvantages of the two material and structure timing systems: timing belt noise, transmission resistance, transmission inertia is small, can improve the engine's power and acceleration performance, and easy to replace. However, the disadvantage is that it is easy to age, the failure rate is high, and the owner's use cost is relatively high. The advantage of the timing chain is that it has a long service life, a low failure rate, and is less likely to cause the car to break down due to a timing drive failure. However, it also has some disadvantages, such as large chain rotation noise, large transmission resistance, and transmission. The inertia is also large, which increases the fuel consumption and reduces the performance from a certain point of view. Although the formal structures of the two materials have some advantages and disadvantages, the timing chain will be applied to more engines for the current development trend. I believe that as designers continue to improve the use of the The cost of car use will also be lower and lower.


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