When the timing belt is an important part of the engine gas distribution system to ensure accurate intake and exhaust by the time and connected to the crankshaft with a certain gear ratio.
1. The timing belt with the principles of action
during operation of an automobile engine, continue to occur inside the cylinder intake, compression, explosion, exhaust four process, and each step the timing must be compatible with the motion and position of the piston, the piston and the intake and exhaust lift each other up and coordination, timing belt inside the engine played a “bridge” role, driven by the crankshaft to pass power to corresponding parts.
When the timing belt is to play the role of connecting link, is connected to an upper portion of the engine head timing pulley, is connected to a lower portion of a crankshaft timing pulley; timing pulley connected camshaft, a cam on the camshaft, the contact point is its small rocker, rocker pressure generated by the timing belt brings power, play the role of top; from the top of the intake valve of the role is to make atomization gasoline into the cylinder, when the door is pushed up so that the exhaust gas discharged cylinder; recess when the camshaft (Note: not projection areas) of theWhen a small party while in contact with the rocker, this time the intake and exhaust valves are closed, the compression ratio to produce, distributor ignition, combustion and began to generate power!
In a four cylinder vehicle, for example, his firing sequence is 1,3,4,2, 1,2,4,3 we may start with a cylinder from:
a cylinder intake valve, an exhaust valve are closed to generate an internal combustion;
At this time the two cylinder almost immediately closing the intake valve, the exhaust valve is closed;
At this time the three cylinders the intake valve is opened almost completely sucked into the gasoline, the exhaust valve closing;
this four-cylinder internal combustion completion time of the intake valve is closed, the exhaust valve is fully open exhaust.
2. Disadvantages timing belt
small timing belt noise, low driving resistance, the drive inertia is small, and possible to improve the dynamic performance of the engine acceleration, and easily replace. But the downside is that easy to aging, the failure rate is high cost, the owner is relatively high.
3. The timing belt replacement cycle
belongs to a timing belt rubber member, as the engine operating time, the timing belt and the timing belt attachment, such as timing belt tension pulley, timing belt tensioner and water pumps are worn or aged. Therefore, any of the engine with the timing belt, manufacturers will have strict requirements, and a timing belt replacement attachments periodically within a predetermined period, the replacement cycle of the engine with different configurations vary, generally in the vehicle travels to 6 when should million to 100,000 km replacement, the replacement cycle should be based on vehicle maintenance manual instructions shall prevail.
Of course, we can not travel alone to determine the timing belt of life, in order to ensure safety in abnormal engine feel, for example, appear not beat the fire engine and so on, you need to check the prompt. Timing belt break can cause serious or even scrapped engine.