Introduction of Pistons and Piston Rings for Marine Diesel Engine Parts

1. Piston

The function of the piston is to withstand the pressure of the gas in the cylinder and transmit this force to the connecting rod. The top of the piston also forms a combustion chamber together with the cylinder head, and the fuel entering the cylinder is burned in this space.

2. Piston ring (trapezoid ring, cone ring, oil ring)

Piston rings are divided into two types: gas rings and oil rings. Their functions and requirements are different, so they also have their own characteristics in structure. The function of the gas ring is to ensure the seal between the piston and the cylinder wall and prevent the high pressure gas on the upper part of the piston from leaking into the crankcase. In addition to the sealing function, the gas ring also plays a heat transfer function. Most of the heat absorbed by the top of the piston is transmitted to the cylinder wall through the gas ring, and then taken away by the external cooling medium. There are many cross-sectional shapes of gas rings. The most common shapes are as follows: rectangular ring, twisted ring, micro-cone ring, barrel ring and trapezoidal ring; oil rings are divided into ordinary oil rings and combined oil rings. The function of the oil ring is mainly to scrape off the excess oil on the cylinder wall and flow back to the crankcase to reduce the consumption of oil.