Shape and characteristics of piston ring
1. Trapezoidal ring: the cross section of trapezoidal ring is trapezoidal, and its main advantage is good adhesion resistance. For some diesel engines with large load, the first ring is easy to bond in the ring groove due to glue, and after trapezoidal ring is adopted, when working, the trapezoidal ring constantly changes its position in the compression stroke and the power stroke with the direction of the piston being subjected to lateral pressure. In this way, the carbon deposit deposited in the ring groove will be squeezed out, thus avoiding the ring from being broken due to sticking in the ring groove, prolonging the service life of the ring, and being more conducive to starting the cold car. In addition, there is a semi-trapezoidal ring, which has the characteristics of an inner twisted ring. The main disadvantages of trapezoidal ring are difficult processing and high precision requirements. It is generally used as the first air ring of diesel engine. 2. Barrel surface ring: the outer circular surface of the barrel surface ring is an externally convex circular arc, and the circular surface is in contact with the circular arc of the cylinder wall, thus effectively avoiding angular load, it has good adaptability to cylinder surface and piston yaw, and has good sealing and running-in. It can form a wedge-shaped oil film in the cylinder whether it goes up or down, floating the ring, thus reducing the wear of the ring and the cylinder wall. Its main disadvantage is that it is difficult to process convex arc surface. 3. Oil ring: the function of the oil ring is to distribute oil upstream and scrape oil downstream. It has three types: slot type, slot spring type and steel belt combination type, and the latter two are commonly used at present. Relatively speaking, the steel belt combined oil ring has more advantages, stronger oil scraping and oil distribution effects, and stronger adaptability to cylinder loss and piston deformation, so it is more and more widely used. However, it generally needs to be made of high quality steel and has high cost. Finally, let's talk about the selection and installation of piston rings. The piston ring is the same as the piston. It is divided into standard size and enlarged size. When selecting, the size level of the ring should be consistent with the size level of the piston.
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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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