The Function of the Piston Connecting Rod Assembly

[HeidiAnn]

The piston works together with the cylinder head and cylinder wall to form the combustion chamber, and it bears the gas pressure inside the cylinder. The force is transmitted through the piston pin to the connecting rod, which drives the crankshaft to rotate. Piston Head: The piston is a component of the combustion chamber, and its shape depends on the type of combustion chamber. Common piston head shapes include flat-top, concave-top, and convex-top designs. Piston Ring Grooves: Piston rings are installed in the piston ring grooves. A gasoline engine typically has 2 to 3 ring grooves. The upper 1 to 2 grooves are used to install compression rings to seal the cylinder, while the bottom groove is for the oil ring. Many radial oil return holes are drilled on the bottom surface of the oil ring groove. When the piston moves downward, the oil ring scrapes excess oil from the cylinder wall, which then flows back to the oil pan through the return holes. If the temperature is too high, the first ring is prone to carbon buildup, leading to overheating and seizure.