What is the function of automobile timing belt?

As an important part of the engine valve distribution system, the timing belt of Pacific Auto Network ensures the accuracy of intake and exhaust time by connecting with the crankshaft and matching with a certain transmission ratio. The timing belt is connected with the timing wheel of the engine cylinder head at the upper part and the crankshaft timing wheel at the lower part.

What is an automobile timing belt? Automobile timing belt is an important part of engine valve system. It is connected with the crankshaft and cooperates with a certain transmission ratio to ensure the accuracy of intake and exhaust time.

Function of timing belt in automobile Timing belt is an important part of engine valve system. It is connected with the crankshaft and cooperates with a certain transmission ratio to ensure the accuracy of intake and exhaust time. Timing belt plays a connecting role. The upper part is connected with the timing wheel of the engine cylinder head, and the lower part is connected with the crankshaft timing wheel. The timing wheel is connected with the camshaft, which has a cam, and its contact point is a small rocker arm, which generates pressure through the power brought by the timing belt and plays a top role. The function of jacking up the intake valve is to let atomized gasoline enter the cylinder, and when jacking up the exhaust valve, it is to let exhaust gas out of the cylinder; When the concave part of the camshaft touches the small rocker arm at the same time, the intake valve and the exhaust valve are closed, resulting in a compression ratio, the distributor is ignited, and internal combustion is started and power generation is generated.

Advantages and disadvantages of timing belt

1, advantages of synchronous belt: synchronous belt is much more affordable, and the noise of rubber products rubbing against metal is very small. After passing through the sound insulation layer of the engine compartment, the noise can be ignored. Moreover, the friction between rubber products and metal is also small, and the transmission resistance of the belt is small, which can ensure the normal power output and acceleration performance of the engine. It should be noted that you should also take good care of your hands and feet. Bad habits such as frequent rapid acceleration and high-speed gear shifting will affect the service life of the belt. Timing belt is quieter than timing chain, and the transmission resistance is small.

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2. Disadvantages of timing belt The life of timing belt is limited. In addition, it is exposed outside the engine. After a long time, the surface of the belt begins to age, and problems such as cracks and belt slippage will follow. The aging and fracture of the belt will lead to the abandonment of the engine overhead valve, valve, piston and crankshaft.

How many kilometers does the synchronous belt of the car need to be replaced? The timing belt must be replaced after driving 60,000 to 80,000 kilometers. Moreover, once the timing belt is broken, the camshaft will definitely not run according to the timing. At this time, it is very likely that the valve will collide with the piston and cause serious damage, so the timing belt must be replaced according to the mileage or time specified by the original factory.

Symptoms of automobile timing belt fracture

1, slight (small deviation) will cause the car to be weak and can't afford to refuel uphill;

2. In severe cases, there will be no idle speed or the engine will shake seriously at idle speed. When refueling, the exhaust pipe will make a blasting sound, and occasionally there will be a dead fire to refuel with the blasting sound;

3. When the car is driving, it suddenly appears unstable idle speed, which is easy to stall, mainly because the fuel door is not smooth and the acceleration is weak. When this problem occurs, if the throttle and other circuit components are excluded, it is necessary to consider whether there is a timing problem;

4. The engine suddenly shuts down while driving. If you hear the high speed of the starter when you re-ignite, you feel that there is no compression, that is, the timing belt is broken;

5. Pay attention to the abnormal sound of the engine tensioner or hear the abnormal sound of the engine pulley when accelerating.

(Photo/Text/Photo: Pacific Auto Network Q&A called Beast)