Automobile engine parts valve and valve spring action
As you know, an engine is a mixture of air and oil, which goes into the engine cylinder and burns and explodes to generate power, and then exhausts the burned exhaust gas. The control mechanism for the intake and exhaust of a four-stroke engine is the valve.
The valve is one of the most important parts in the engine. The valves are divided into inlet valves and exhaust valves and are shaped like horns. The INTAKE VALVE IS RESPONSIBLE FOR CONTROLLING THE AIR AND FUEL MIXTURE ENTERING THE intake manifold (direct injection IS used TO supply oil TO THE cylinder), and the exhaust valve is responsible for discharging the internal combustion waste gas. Cylinder. External control. Previous engines had only one intake valve and one exhaust valve per cylinder. This design is simpler and cheaper. The vehicle is responsive at low speeds, but inefficient at high speeds. Later improvements were made to improve the efficiency of intake and exhaust. Vehicle performance, today's engines are mostly multi-valve designs,
The FUNCTION OF THE VALVE IS TO DRIVE THE CAMSHAFT THROUGH a BELT OR metal CHAIN CONNECTED TO THE CAMSHAFT THROUGH THE CRANKshaft, and then the convex part of the CAMshaft pushes the valve downward to perform the intake and exhaust actions, and then the closing action is handed over to the valve. The valve spring is responsible. Today's valve springs are mostly cylindrical helical springs, which rely on the tension of their springs to quickly return the open valve to the closed position and prevent the valve from generating gaps due to inertial forces during engine movement.The valve can be tightly fit in the closed state, also can prevent the valve due to vibration when beating and damage to the seal.
Because VALVES AND VALVE SPRINGS MUST OPERATE IN HARSH ENVIRONMENTS, ESPECIALLY WHEN THE VALVE IS in DIRECT CONTACT WITH HIGH TEMPERATURE GASES, THE MATERIAL MUST HAVE SUFFICIENT STIFFNESS AND heat resistance. Now the valves are mostly made of hardened JISSUH3 special heat resistant alloy, JISSUH36 (21-4N) advanced heat resistant alloy steel, STELLITE cobalt chromium tungsten alloy steel. The valve spring is made of carbon chromium vanadium steel wire or silicon chromium steel wire, so that the spring has enough stiffness and fatigue resistance, can withstand frequent compression load, and maintain the appropriate spring force.
