Rocker arm
-From Wikipedia
-Overview
A rocker arm (in the context of an internal combustion engine of automotive, marine, motorcycle and reciprocating aviation types) is an oscillating lever that conveys radial movement from the cam lobe into linear movement at the poppet valve to open it. One end is raised and lowered by a rotating lobe of the camshaft (either directly or via a tappet (lifter) and pushrod) while the other end acts on the valve stem. When the camshaft lobe raises the outside of the arm, the inside presses down on the valve stem, opening the valve. When the outside of the arm is permitted to return due to the camshafts rotation, the inside rises, allowing the valve spring to close the valve.
Some overhead cam engines employ short rocker arms in which the cam lobe pushes down (rather than up) on the rocker arm to open the valve. On this type of rocker arm, the fulcrum is at the end rather than the middle, while the cam acts on the middle of the arm. The opposite end opens the valve. These types of rocker arms are particularly common on dual overhead cam motors, and are often used instead of direct tappets.
-Material
For car engines the rocker arms are generally steel stampings, providing a reasonable balance of strength, weight and economical cost. Because the rocker arms are, in part, reciprocating weight, excessive mass especially at the lever ends limits the engine's ability to reach high operating speeds. For this reason, aluminum is often used for high performance, aftermarket rocker arms for pushrod engines as well as many OEM rocker arms on OHC engines. Aluminum rockers on OHC engines often have a steel pad or roller where the cam contacts the rocker arm in order to reduce wear. Truck engines (mostly diesel) use stronger and stiffer rocker arms made of cast iron (usually ductile), or forged carbon steel. We can supply high efficiency manufacturing facility/machine/equipment with professional technology to your casting iron/steel parts of rocker arm production line, which can help you to produce a ball valve product with better quality and competitive price.Welcome inquiry.
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