Engine internal parts: valve and valve spring

We all know thatEngineRely on absorption into the air and fuel mixture entering the engine cylinder combustion explosion was used to generate power, and then burnt exhaust emissions, while the charge of four-stroke engine, intake and exhaust valve bodies are. Valve is a very important part within the engine, one of valve into the intake valve (intake valve) and the exhaust valve (exhaust valve), it looks like a horn shape. The intake valve is responsible for air into the intake manifold and fuel oil mixture (GDIIs the oil in the cylinder) to enter the cylinder after the control, while the exhaust valve is responsible for combustion in the cylinder after the cylinder of exhaust emissions outside the control.

Before the engine is only one intake valve per cylinder and an exhaust valves, so that the design of relatively simple low-cost, low-speed vehicles in response to good, but less efficient at high speeds, and later in order to enhance Jin, exhaust efficiency, enhance vehicle performance, the majority of today’s multi-valve engines are designed, the most common four-valve per cylinder design, a four-cylinder engine, for example, four valves per cylinder 16-valve four-cylinder that is, that is, we often in a magazine or network, see the “16V”. Valve actuation link through the crankshaftCamshaftThe belt or metal chain driven camshaft, and then promoted by the camshaft lobe valve down to open the intake and exhaust to carry out the action, as the action is to close the valve spring is responsible for.

Today most of the valve springs are mostly cylindrical spiral spring, its role is to rely on their spring tension so that the steam to open the door quickly returned to the closed position, and to prevent the movement of the engine valves due to inertial forces resulting gap, to ensure that valve in the closed state, is close fitting, but also to prevent the valve in the beating and damage due to vibration seal. As the valve and valve spring to be in harsh harsh working environment, in particular the valve even more direct contact with the hot gas, and therefore must have sufficient material on the strength and heat resistance, rigidity. Most of today’s valve sclerosis with JIS SUH3 burned into a special heat-resistant alloys, JIS SUH36 (21-4N) High heat-resistant alloy steel, STELLITE cobalt-chromium alloy and other materials made of tungsten. Valve spring is mostly Chinese and carbon chrome vanadium steel wire or chrome wire made of silicon, so that spring has sufficient rigidity and resistance to fatigue strength to withstand the compression load and frequent maintenance of an appropriate stretch.

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