What is the role of the wrist pin (piston pin)?

The wrist pin, also known as the piston pin, serves a crucial function in the operation of an internal combustion engine by connecting the piston to the connecting rod. This pin allows for the movement of the piston as it travels up and down in the cylinder during the power cycle of the engine. The design enables the piston to pivot slightly as the connecting rod moves, which is essential for maintaining efficient performance and avoiding stress on the piston structure.

This connection is vital because the connecting rod translates the linear motion of the piston into the rotational motion of the crankshaft. Additionally, the wrist pin must be durable and capable of withstanding the high pressures and temperatures encountered during engine operation. Thus, its role is fundamental in the mechanical link between the piston and the connecting rod, which is critical for converting combustion energy into mechanical energy.

Understanding the wrist pin's function is important when learning about engine assembly and operation, as it directly impacts the engine's efficiency and longevity.