What is a Crankpin?

A crankpin is a cylindrical metal component that is part of the crankshaft in an internal combustion engine. The crankpin is located on the crankshaft and serves as a pivot point for the connecting rod, which connects the piston to the crankshaft.

The crankpin is typically made of forged steel or cast iron, and it is designed to withstand the high stresses and loads that are generated by the engine's operation. The crankpin is usually located at the center of the crankshaft and is surrounded by the bearing journals, which allow the crankshaft to rotate smoothly.

The connecting rod is attached to the piston through a small pin called the wrist pin, which is located at the top of the piston. The wrist pin is connected to the crankpin through a bearing called the wrist bearing, which allows the connecting rod to move up and down as the piston reciprocates.

Overall, the crankpin plays a critical role in the operation of the engine by transferring the force generated by the combustion process to the connecting rod and ultimately to the piston.