Where: M C – eccentric mass of the cam ω – rotation speed R – eccentricity of the cam.Īccording to the formula, an increase of the rotation speed by three times raises the force by a factor of nine. The inertia force of the cam may be expressed by the formula: F = M C * ω 2 * R However, at high rotation speed, the dynamic forces generated by the rotating cams may compensate for the load transmitted by the pushrods. Thus, in the overhead valvetrain design, the lower part of the bearings may potentially fail. Such force produces a load applied to the lower part of camshaft bearings. The force required for opening the valve counteracts the cylinder pressure, the spring force and the dynamic forces of the accelerating and decelerating (reciprocating) parts: valve, rocker arm, pushrod. The cams transmit the load through the pushrod to the rocker arm which presses the valve and displaces it from the closed position. The camshaft of OHV is mounted in the cylinder block. Overhead valve engines are also called pushrod engines.
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