Crankshaft 3073707 for M11 QSM11 Engines

Crankshaft 3073707 for M11 QSM11 Engines

The most important part of the engine. It bears the force from the connecting rod and converts it into torque. It outputs through the crankshaft and drives other accessories on the engine. The crankshaft is subjected to the combined action of centrifugal force of rotating mass, periodic gas inertia force and reciprocating inertia force, which makes the crankshaft bear bending and torsion load. Therefore, the crankshaft is required to have sufficient strength and stiffness, 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 produced during its motion, the crankshaft journal is often made hollow. There are oil holes on the surface of each journal to introduce or lead out the oil to lubricate the journal surface. In order to reduce the stress concentration, the joints of the main journal, crank pin and crank arm are all connected by transition arc.

The function of crankshaft counterweight (also called counterweight) is to balance the rotating centrifugal force and its torque, sometimes it can also balance the reciprocating inertia force and its torque. When these forces and moments are in balance, the counterweight can also be used to reduce the load on the main bearing. The number, size and location of counterweight should be considered according to the number of cylinders, cylinder arrangement and crankshaft shape. The counterweight is usually cast or forged into one body with the crankshaft. The balance weight of high-power diesel engine is manufactured separately from the crankshaft, and then connected together by bolts.

Cummins MTA11 ISME truck diesel engine motor parts 3973707 crankshaft, with list of crankshafts for Cummins engines, as below:

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