13011-3110A Piston Ring Set HINO Engine P11C

The main functions of piston rings in engines are:

1.Sealing the combustion chamber so that there is minimal loss of gases to the crank case.
2.Improving heat transfer from the piston to the cylinder wall.
3.Maintaining the proper quantity of the oil between the piston and the cylinder wall
4.Regulating engine oil consumption by scraping oil from the cylinder walls back to the sump.

What is a piston ring?

Between the piston and cylinder, the piston ring is a part that is needed for an engine to work efficiently. Piston Rings have 2 main functions.

Piston ring function 1 :Seal for combustion gas

Function is to fully maintain in-cylinder airtightness between the piston and cylinder wall

It works hard to keep a lid on combustion gas leaking into the gap between the piston and cylinder created at the time of an explosion.
If combustion gas leaked, full power could not be realized and fuel consumption would increase, which is detrimental both economically and environmentally.

Function 2: Control lubricating oil (engine oil)

Function to constantly create the minimum required lubricating oil layer to prevent burn

Inside an engine's cylinder, the piston ring is subject to high-temperature combustion gas, and, with the piston, must travel and return many thousands of times a minute, or even more.
To ensure the piston ring and cylinder do not burn, and to prevent excess lubricating oil getting inside the combustion chamber, the cylinder wall lubricating oil layer is controlled at the minimum required.

1.Force:

The force acting on the piston ring is the gas pressure,the ring's own elastic force,the inertial force of the ring reciprocating motion,the friction between the ring and the cylinder and the ring groove,as shown in the figure.Due to these forces,the ring will produce basic motions such as axial motion,radial motion,and rotary motion.In addition,due to its motion characteristics,the piston ring is accompanied by irregular movement,and inevitably,floating and axial vibrations caused by axial irregular motion,radial irregular motion and vibration,twisting motion,and the like are inevitable.These irregular movements often prevent the piston ring from functioning.When designing the piston ring, it is necessary to give full play to the favorable movement and control the unfavorable side.

2.Thermal conductivity:

The high heat generated by the combustion is transmitted to the cylinder wall through the piston ring,so that it can function as a cooling piston.The heat radiated from the piston ring to the cylinder wall can generally reach 30-40% of the heat on the top of the piston.