What is the cross-sectional shape of piston rings?
1 Answers
Piston rings have the following cross-sectional shapes: 1. By overall cross-sectional structure: rectangular, trapezoidal, and wedge-shaped; 2. By outer surface shape: cylindrical, conical, micro-conical, barrel-shaped, and asymmetric barrel-shaped; 3. By inner notch style: upper inner step, upper inner chamfer, lower inner step, lower inner chamfer; 4. By twist type: positive twist and negative twist. Main functions of piston rings: 1. Sealing: Piston rings maintain sealing between the piston and cylinder wall, minimizing gas leakage; 2. Heat conduction: They distribute high heat generated by combustion to the cylinder wall, cooling the piston; 3. Oil control: They scrape oil adhering to the cylinder wall and maintain normal oil consumption; 4. Support: Piston rings move up and down in the cylinder, preventing direct contact between the piston and cylinder, providing support.