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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