The role of timing belt?

The timing belt is used to support the upper and lower wheels. The upper connection is the timing wheel of the engine cylinder head, the lower connection is the crankshaft timing wheel; the timing wheel is connected to the camshaft, and the camshaft has a cam and its contact point. It is a small rocker arm, and the rocker arm generates pressure through the power brought by the timing belt to play the role of jacking up; the function of jacking up the intake valve is to let the atomized gasoline enter the cylinder block, and when the exhaust valve is jacked up, it is Exhaust gas is discharged from the cylinder; when the camshaft is recessed (note: not a raised place), the intake valve and the exhaust valve are closed at the same time, the compression ratio is generated, the distributor is fired, and the internal combustion is performed. Start and generate motivation!