How much does the camshaft rotate after one revolution of the crankshaft

One revolution of the crankshaft and one half revolution of the camshaft mean one revolution of the camshaft, two revolutions of the crankshaft, and two revolutions of the crankshaft of a four cylinder engine, 720 degrees, are evenly divided into four strokes of 180 degrees for each cylinder. These four strokes are then evenly divided into the valve distribution system of a single cylinder, which is the opening and closing angles of the intake and exhaust of the camshaft.

The crankshaft is the most important component in an engine. It bears the force transmitted from the connecting rod and converts it into torque, which is output through the crankshaft and drives other accessories on the engine to work. The crankshaft is subjected to the combined action of the centrifugal force of the rotating mass, the periodically varying gas inertia force, and the reciprocating inertia force, making the crankshaft withstand the bending and torsional load. Therefore, the crankshaft is required to have sufficient strength and stiffness, and the surface of the journal should be wear-resistant, work evenly, and have good balance.

In order to reduce the mass of the crankshaft and the centrifugal force generated during movement, the crankshaft journal is often made hollow. An oil hole is opened on each journal surface to introduce or lead out oil for lubrication of the journal surface. To reduce stress concentration, the main journal, crank pin, and crank arm are connected by a transition arc.