We all know that the engine is on take in air and fuel mixture into the engine cylinder combustion explosion to generate the power, and then burned exhaust fumes, and agency is in charge of the four stroke engine intake and exhaust valve.
within one of the important parts, valve is engine valve are divided into inlet valve (
intakevalve)
And the exhaust valve (
exhaustvalve)
The shape of the, it looks like horn.
Inlet valve is responsible for the air into the intake manifold and fuel mixture (
Direct injection (gdi) is within the cylinder oil)
After going into the control inside the cylinder, and the exhaust valve is in charge of the combustion in cylinder after the emission control outside the cylinder.
Before each cylinder engine is only one set of inlet and an exhaust valve, the design is simple and low cost, low speed of the vehicle response is good, but low efficiency at high speed, then in order to improve the inlet and exhaust efficiency, improve the performance of the vehicle, nowadays most of the engines are using multiple valve design, the most common is the design of the 4 valves per cylinder, with four cylinder engine as an example, 4 valves per cylinder four cylinder is 16 valve, namely we often see in magazines or on the Internet '16 v.
the valve movement is through the crankshaft link CAM belt or metal chain drive the camshaft, again by the protuberant part camshaft drive valve to open, to carry out the action of air intake and exhaust, and the action of the closure will is responsible to valve
springs.
Today most of the valve spring of cylindrical helical spring, it is depend on the tension of the spring to open valve quickly returned to the closed position, and to prevent movement of the valve in the engine caused by inertial forces in the process of clearance, to ensure that the valve in the closed position can fit closely, but also prevent the valve during vibration damage sealing by beating.
due to the valve and valve spring must work under the harsh environment, especially the valve is directly contact with high temperature gas, so the material must have sufficient strength and rigidity on the heat resistance.
Today most of the valve adopts JISSUH3 burn-in hardening special heat-resistant alloy, JISSUH36 (
21 -
4 n)
High alloy steel, STELLITE material such as tungsten cobalt chromium alloy steel is made character.
Valve springs for the most part by the carbon in the chrome vanadium steel wire manufactured or silicon chromium steel wire, spring has sufficient rigidity and fatigue resistance, to withstand frequent compression load and maintain proper tension.
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