Caterpillar camshaft in the gas distribution system provides the main function - the timely opening and closing of the valves, thereby bringing in fresh air and exhaust gases. In general, the camshaft controls the gas exchange process in the engine.
To reduce inertia loads, increase the stiffness of the elements of the gas distributing mechanism, the camshaft must be located as close to the valves as possible. Therefore, the standard position of the camshaft on a modern engine in the cylinder head.
The basis of the design of the camshaft are cams. For each valve, as a rule, one cam is used. The cam has a complex shape that allows the valve to open and close at the set time, and raise it to a certain height. Depending on the design of the gas distribution mechanism, the cam interacts with either the pusher or the rocker.
From the longitudinal movement of the camshaft, the thrust bearings, located near the drive gear (sprocket), are held.The camshaft is lubricated under pressure. Individual oil supply to each bearing is preferred. The effectiveness of the gas distribution mechanism with the use of various systems of variable valve timing significantly improves, which allows achieving increased power, fuel efficiency, and reducing the toxicity of exhaust gases. There are several approaches to changing the phases of gas distribution:
Turn the camshaft in various modes of operation;
Use multiple cams with different profiles per valve;
Change the position of the axis of the rocker arm.
A small list of camshafts for Caterpillar engines you will find online at our CAT parts store