Piston Rings – NPR

Piston Rings

A piston ring must have both spring-like tension and the properties to become a true circle when closed. In the combustion chamber of engine, NPR’s piston rings serve to seal combustion gas, control lubricating oil, dissipate heat, and prevent wear and seizure under the severe conditions of operation. Now that engines are required to be more compact, lighter, and more sophisticated in performance, the choice of piston ring materials has been widened to include steel in addition to the traditional cast iron. Moreover, in order to enhance their wear resistance and durability, they also undergo various surface treatments including nitriding and PVD treatment.

09a

Gasoline Engines

In these environmentally aware times, progress is being made in the introduction of low-emission cars for NOX and HC reductions and in the control of fuel consumption for CO2 reduction. To achieve these purposes, the following techniques have been developed and incorporated in the design of piston rings.

– Piston ring combination for low-friction
– Thinner width compression-and oil control rings
– Advanced surface treatments, and high-durability, low-cost materials
– Optimum design through tuning techniques

09a

Diesel Engines – Passenger Car

This is a ring set to meet high speed use and high durability. Steel material is adopted on 1st ring and 2 piece oil ring. Nitriding or PVD treatment is made on 1st ring and oil ring.

10a

Cylinder Liner

Located within the cylinder block, the inside of the cylinder liner constitutes the combustion chamber of the engine. There are a variety of liners, including wet liners whose external circumference is directly exposed to cooling water, dry liners which are fitted into machined cylinder blocks, and aluminum cast-in liners whose inner periphery is machined after being cast into aluminum blocks.

As with piston rings, the development of cylinder liners is now being pursued through liner-piston ring combination techniques in order to meet the CO2, NOX, PM, and other emission control standards as well as the requirement for higher fuel efficiency (reduction in weight).

    Request a Free Quote