Forms and causes of piston ring wear
The function of the piston ring is to seal the gap between the piston and the cylinder wall. The piston ring has a gas ring and an oil ring. The function of the Air ring is to ensure the sealing of the gas in the cylinder, and to transmit the heat from the upper part of the piston to the cylinder wall, which is emitted to the atmosphere by cooling water or air. The oil ring is used to scrape off the excess lubricating oil on the cylinder wall, prevent the oil from burning and losing, make the oil evenly distributed on the cylinder wall, and improve the lubrication conditions of the piston, piston ring and cylinder wall. Because the piston ring works under the conditions of high temperature, high pressure, high speed and extremely difficult lubrication, the piston ring material is made of wear-resistant and heat-resistant high-quality gray cast iron, and the working surface of the piston ring is porous chrome plated. Porous chrome plating has high hardness and can store a small amount of engine oil to improve lubrication conditions and prolong the service life of the ring by 2-3 times. There are two forms of piston ring wear: abrasive wear and napping wear. Abrasive wear: mainly caused by dust and mechanical impurities entering the cylinder. These sharp impurities attach to the cylinder wall, causing abrasive wear of piston rings and Pistons, and are transmitted everywhere through lubricating oil. The first air ring has a large ring pressure and wears the fastest. Napping wear: napping is a melting process, that is, due to the high temperature, small gap and serious friction between the higher part of the friction surface, the small pieces of the piston ring are temporarily melted, and welding and napping occur. The Napping of the piston ring usually occurs at the position where the first air ring reaches the top dead center of the cylinder. Because the temperature here is the highest, the lubrication is the worst, and the ring has a short stay relative to the cylinder wall, the napping is most likely to occur. Once the napping starts, it expands rapidly. When the napping continues to expand, the sealing effect of the Air ring and the oil ring is destroyed, air leakage occurs and the consumption of lubricating oil increases.
GUANGZHOU HEARTEN AUTO PARTS CO,LTD. is different from other companies as we provide timely and unique services to our respected clients.
We humbly ask you to use custom piston rings and we guarantee that you would be in a great delight with using the product.
We are professional in manufacturing custom piston rings, and always emphasize the technology and quality during the producing procedure.
Our PVD Ion Plating Piston Ring is manufactured with advanced multi-arc ion plating technology under high vacuum conditions. Stable arc discharge between cathode and anode generates high-energy plasma, which deposits dense, uniform coatings such as TiN, CrN, ZrN onto the piston ring surface under workpiece bias voltage.
With excellent adhesion and high bonding strength, the coating stays firm without peeling. Hardness reaches 1800–2500 HV, 4–6 times higher than base materials, recognized as a super-hard coating. Friction coefficient is 0.4, delivering 10× improved wear resistance and outstanding corrosion resistance. Ideal for heavy-load engines, construction machinery and commercial vehicles, it greatly extends service life and reduces maintenance costs.
Backed by professional PVD coating equipment and strict quality control, Hearten Auto Parts upholds Precision Craftsmanship, Technological Leadership to provide reliable high end piston ring solutions.
Our Ceramic Titanium Piston Ring uses cutting-edge nano ceramic coating and multi-arc ion plating process. In a high vacuum environment, high-energy plasma reacts and deposits uniformly to form high-performance coatings like TiN, TiC, ZrN, ensuring strong bonding with the substrate.
It features ultra-strong adhesion and high compactness. Hardness reaches 2200–2500 HV, 3–12 times higher than raw materials, classified as a super-hard coating. With friction coefficient 0.4, wear resistance is improved by 150 times, providing outstanding durability under extreme working conditions. The high-density coating also delivers superior corrosion resistance and stable low-friction performance.
Designed for high-performance engines and heavy-duty machinery, our ceramic titanium piston rings combine advanced technology with strict quality control, fully embodying Precision Craftsmanship, Technological Leadership.
Our CKS (CID) Piston Ring adopts upgraded Chromium-based Composite Ceramic technology, an industry breakthrough that meets Euro IV emission standards and delivers double the wear resistance of conventional chrome plating.
The process forms uniform mesh textures inside the outer chrome layer, filled with wear resistant particles to enhance anti-friction performance. The mesh structure also provides excellent oil storage capacity, effectively lowering friction and protecting cylinder liners. The ring body is strengthened by nitriding treatment, boosting hardness, strength and impact resistance.
The bad piston ring may be related to the air leakage caused by its wear or coke connection with the piston ring groove. If after cutting off a cylinder, the exhaust gas no longer from the oil or vent vent, the cylinder piston is not good use.
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