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Rocker arm introduction

08 Oct 2016 - Rocker arm
      A rocker arm is the arm that sits on top of the valve stem and connects to the push rods 'the push rods sit on the cam so when engine is running, the push rods go up and down in a timed sequence and with the rocker arms, open and close the inlet and exhaust valves. the rocker arm is located inside the valve(rocker) cover One component was left out. 

      A rocker arm lever reciprocates in order to transfer radial movement from the cam into linear movement, enabling the poppet valve to open. "Cam" refers to linkage used to convert one form of motion, such as rotary, into another form, such as linear. Poppet valves comprise a hole and valve stem. When the cam lifts the rocker arm’s outside end, the inside of the arm lowers, exerting pressure on the poppet valve stem and opening the valve.

     A rocker arm is a valvetrain component in internal combustion engines. As the arm is acted on by a camshaft lobe, it pushes open either an intake or exhaust valve. This allows fuel and air to be drawn into the combustion chamber during the intake stroke or exhaust gases to be expelled during the exhaust stroke. Rocker arms were first invented in the 19th century and have changed little in function since then. Improvements have been made, however, in both efficiency of operation and construction materials. Many modern rocker arms are made from stamped steel, though some applications can make use of heavier duty materials.

     In many internal combustion engines, rotational motion is induced in the crank shaft as the pistons cause it to rotate. This rotation is translated to the camshaft via a belt or chain. In turn, lobes on the camshaft are used to push open the valves via rocker arms. 

     This can be achieved either through direct contact between a camshaft lobe and rocker arm or indirectly though contact with a lifter driven pushrod. Overhead cam engines have lobes on the camshaft which contact each rocker arm directly, while overhead valve engines utilize lifters and pushrods. In overhead cam engines, the camshaft can be located in the head, while overhead valve engines have the camshaft in the block. 

     Oumurs Motorcycle Parts CO.,LTD located in Guangzhou which engaging in all kinds of motorcycle spare parts such as rocker arm, piston kit cylinder kit, coil, motor etc. It manufacture a screw to the whole motorcycle for 16 years . Respect every customer,meet every request, consider everything for you" is our principle, because of our wide range of products, fine quality, favorable price and professional service,we have accumulated a large number of loyal clients.
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