Detailed Info of IX-85000_8-97190-927-0 Crankshaft
The crankshaft is the most important part of the engine. It bears the force from the connecting rod and transforms it into torque. The torque is output through the crankshaft and drives other accessories on the engine. The crankshaft is subjected to the combined action of the centrifugal force of rotating mass, periodically varying gas inertia force and reciprocating inertia force and the crankshaft bearing is subjected to bending and torsion loads. Therefore, the crankshaft should have sufficient strength and stiffness and the surface of the journal needs to be wear resistant, uniform and balanced.
In order to reduce the crankshaft mass and the centrifugal force generated during movement, the crankshaft journal is often hollow. Oil holes are made on the surface of each journal so that oil can be introduced or drawn to lubricate the journal surface. In order to reduce the stress concentration, the spindle neck, the crank pin and the crank arm are connected by a transitional arc.
The crankshaft balance weight (also known as counterweight) is used to balance the rotating centrifugal force and its torque, sometimes it can also be used to balance the reciprocating inertial force and its torque. When the force and torque are self-balanced, the balance weight can be used to reduce the load of the main bearing. The number, size and position of the balance weight should be in accordance with the number of cylinders, cylinder arrangement and crankshaft shape of the engine. The balance weight is usually cast or forged into one crankshaft. However, high-power diesel engine balance weight and crankshaft are manufactured separately, and then bolted together.
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