Learn the Optimization of Rocker ARM

 In internal combustion engines a rocker arm is a valve train component. As rocker arm is acted on with the help of a camshaft lobe, it pushes and opens either the intake or exhaust valve. This during the intake stroke or exhaust gases to be expelled during the exhaust stroke allows fuel and air to be drawn into the combustion chamber. In the 19th-century rocker arms were first invented and since then they have been changed a little in function. However, in both efficiencies of operation and construction materials there have been improvements made.

By using composite materials we analyze rocker arms. In optimizing Rocker Arm, strength, stability, durability, high dimension, wear resistance, toughness, material cost and economic play major role.

Conveying radial movement into linear movement at the poppet valve from the cam lobe, a rocker arm is an oscillating lever that so that it can be opened. Lash adjusters are also used for this purpose. While the other end acts on the valve stem, by a rotating lobe of the camshaft, one end is raised and lowered.   The inside presses down on the valve stem opens the valve only when the camshaft lobe raises the outside of the arm. Due to the camshafts rotation, when the outside of the arm is permitted to return the inside rises, the valve spring results in closing of the valve. 

To actuate the inlet and exhaust valves motion the rocker arm is used as directed by the cam and follower. It can be made of malleable iron, cast iron or cast steel. I-section is used for the high speed engines in order to reduce inertia of the rocker arm and it may be rectangular section for low speed engines. The rocker arms for the exhaust valve are the most heavily loaded in four stroke engines. Though to operate the inlet valve the force required is relatively small, yet it is usual practice to make the rocker arm for the inlet valve of the same dimensions as that for exhaust valve.

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