A pivoted lever that transmits the action of the pushrod to the valve stem. (Pushrod upward action is converted to downward push on the valve stem. )
It is a pivoted lever which transmits the action of the pushrod to the valve stem.
The part you see under the valve cover. This part transmits the pushing force from the PRs to the valve stems by pivoting on a center shaft. Stock rocker arms have an output to input ratio of 1.1:1 but they can commonly be bought in the ratios 1.25:1, 1.4:1 for more valve lift without having to change the cam. Before using the high ratio rockers, check with your cams manufacturer to see if those rockers will work well with the cam.
a lever pivoted at the center; used especially to push a valve down in an internal-combustion engine
a simple device located on a cam on the camshaft
A lever that rocks on a central pivot, with one end moved up and down by the camshaft, and the other end operating an inlet or exhaust valve.
A lever which rotates around a shaft pushing down (opening) the valve with an end when the other end is pushed up by the pushrod. Spring pressure will later close the valve. Figure 24 Typical rocker arm and shaft assembly
A lever located on a fulcrum or shaft, one end on the valve stem and the other either on the push rod or directly on the camshaft lobes. As the camshaft rotates, the arms rock on their fulcrums causing the valves to open and close.
On an engine a rocker arm is a lever that transmits the motion of the camshaft to open and close the valves.