Traditional engines usually have one intake valve and one exhaust valve per cylinder. This two-valve valve mechanism is relatively simple and the manufacturing cost is low. For ordinary engines with low output power requirements, they can get more Satisfactory engine output power and torque performance. Engines with larger displacement and higher power should adopt multi-valve technology. The simplest multi-valve technology is a three-valve structure, that is, an intake valve is added to the two-valve structure with one inlet and one row. In recent years, most of the newly developed cars of the world's major automobile companies have adopted a four-valve structure. In the four-valve valve train, each cylinder has two intake valves and two exhaust valves.
On January 29, 1886, the German Karl Benz installed his own four-stroke single-cylinder fuel engine on a three-wheeled car and obtained the patent right. From this day on, the world truly had a car. It can be said that the engine created the car. The basic structure of the engine is composed of cylinder 1, piston 2, connecting rod 3, crankshaft 4 and other main parts. Each cylinder has at least two valves, one intake valve (blue) and one exhaust valve (orange).
The valve device is an integral part of the engine's valve train and plays a very important role in engine work. The working operation of a fuel engine consists of four working processes: intake, compression, work and exhaust. To make the engine run continuously, it is necessary to make these four working processes go round and round, and cycle work in sequence and timing.
Two of the working processes, the intake and exhaust processes, need to rely on the engine's valve train to accurately deliver combustible mixture (gasoline engine) or fresh air (diesel engine) in accordance with the working sequence of each cylinder, as well as exhaust the burned air. Exhaust gas. For the other two working processes, compression and work processes, it is necessary to isolate the cylinder combustion chamber from the outside air intake and exhaust passages to prevent gas from leaking out to ensure the normal operation of the engine. The part responsible for the above work is the valve in the valve train. It is like a human respiratory organ, inhaling in and out, it is indispensable.
With the development of technology, the speed of automobile engines has become higher and higher. The speed of modern car engines generally can reach more than 5500 revolutions per minute. It only takes 0.005 seconds to complete the four working processes. The traditional two-valve is no longer competent at this. The completion of the ventilation work in a short time limits the improvement of engine performance. The only way to solve this problem is to expand the space for gas in and out. In other words, space is exchanged for time. Multi-valve technology is the best way to solve the problem. It was not until the 1980s that the promotion of multi-valve technology made a qualitative leap in the overall quality of the engine.
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