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The Crankshaft Is The Most Important Part Of The Engine
Aug 08, 2018

The crankshaft is the most important component in the engine. It takes the force from the connecting rod and converts it into torque through the crankshaft output and drives other accessories on the engine. The crankshaft is subjected to a centrifugal force of a rotating mass, a cyclically varying gas inertial force, and a reciprocating inertial force to cause the crankshaft to undergo a bending torsional load. Therefore, the crankshaft is required to have sufficient strength and rigidity, and the journal surface needs to be wear-resistant, work evenly, and have good balance.

The most important part of the engine. It takes the force from the connecting rod and converts it into torque through the crankshaft output and drives other accessories on the engine. The crankshaft is subjected to a centrifugal force of a rotating mass, a cyclically varying gas inertial force, and a reciprocating inertial force to cause the crankshaft to undergo a bending torsional load. Therefore, the crankshaft is required to have sufficient strength and rigidity, and the journal surface needs to be wear-resistant, work evenly, and have good balance.

In order to reduce the mass of the crankshaft and the centrifugal force generated during the movement, the crankshaft journal is often made hollow. Oil holes are formed in each journal surface to introduce or withdraw oil to lubricate the journal surface. In order to reduce the stress concentration, the transition of the main journal, the crank pin and the crank arm is connected by a circular arc.

The function of the balance weight of the crankshaft (also called the counterweight) is to balance the centrifugal force and its torque, and sometimes to balance the reciprocating inertial force and its moment. When these forces and moments are themselves balanced, the counterweight can also be used to relieve the load on the main bearing. The number, size and placement of the counterweights should be considered based on factors such as the number of cylinders in the engine, the arrangement of the cylinders, and the shape of the crankshaft. The balance weight is generally integrated with the crankshaft casting or forging. The high-power diesel engine balance weight is manufactured separately from the crankshaft and then bolted together.