DK28 diesel engine accessories introduces the role of the clearance between the rocker arm and the valve

The rocker arm is used to transfer the action between the camshaft and the valve; The material of the rocker arm is generally medium carbon steel, and some use ductile cast iron or alloy cast iron. Valve clearance In the cold state of the engine, when the valve is closed, the gap between the valve and the transmission is called the valve clearance.

The function of the valve rocker arm is to complete the engine and exhaust function by matching the opening mode of the camshaft. Marine diesel engine accessories, the valve rocker arm is a two-arm lever, with the rocker arm shaft as the fulcrum, the two arms are not equal in length. The short arm end is machined with a threaded hole for screwing in the valve clearance adjustment screw. The long arm end is machined into an arc surface, which is the working face of the driving valve.

The rocker arm seat is a component of the intake and exhaust mechanism in an overhead valve engine. The intake and exhaust mechanism is composed of camshaft, tappet, rocker arm, rocker arm shaft, rocker arm seat, valve, valve spring and other parts. The opening and closing of the valve is completed by the tappet and rocker arm action. The rocker arm is installed on the rocker arm seat through the rocker arm shaft. One end is driven from the camshaft through the tappet, and the other end is pushed on the valve rod and the spring acts together to control the opening and closing of the valve.