What is the effect of a notch in the outer circle of a piston ring?
According to the classification of functions, piston rings can be divided into gas rings dominated by airtight functions and oil rings dominated by oil control functions. 1 Air ring Air ring is divided into installation positions, including the first compression ring, the second compression ring and the third compression ring. The air ring is divided into structural shapes, including rectangular ring, barrel surface ring, conical ring, trapezoidal ring and twisted ring. The twisted ring includes inner chamfer ring, inner step ring, outer step ring, nose ring and wedge ring. (1)Rectangular ring, section is rectangular gas ring. The geometric shape is simple, has sufficient sealing under normal working conditions, and is easy to process. It was often used for medium and small power diesel engines. However, with the increasing strengthening of the engine, the thermal load of the piston increases and the thermal deformation increases, the swing of the piston head is intensified and other reasons cause the rectangular ring to lose its good fit with the cylinder wall during operation. The upper edge of the rectangular ring contacts the cylinder wall while the lower edge leaves the cylinder wall, thus no oil scraping effect can be achieved, on the contrary, the oil is pumped upward to increase the oil consumption, so the use of rectangular rings is limited and is widely used in low-speed crosshead engines. (2) The surface shape of the barrel surface ring is mostly convex and circular. Generally, half of the nominal diameter is taken as the radius of the barrel surface (That is the pack of radius is equal to cylinder radius). It is mainly used as the first air ring (Usually chrome plated), Often used in series with conical ring. Its advantages are as follows: a because both sides of the barrel surface ring are wedge-shaped and the inlet clearance of the oil is large, the oil enters by wedge-shaped and generates an oil pressure that floats the ring to form liquid lubrication, therefore, wear can be reduced; B there is a line contact between the barrel surface ring and the cylinder, which can adapt to the shaking of the piston and reduce the occurrence of adhesive wear due to the improvement of contact conditions; C has good running-in performance, and the barrel surface ring is essentially a two-way micro-conical ring, so it is easy to run-in; D good sealing performance. The ring is in contact with the cylinder line and can maintain good contact even when the surface is deformed. (3) Conical ring the outer circle of the conical ring is tapered and the taper is generally 8. 7 ~ 26. 2mR (0. 5 ° ~ 1. 5 °)Coating or non-coating structure is adopted. The conical ring is a very small bevel on the outer circular surface of the piston ring. As the contact surface between the ring and the cylinder wall is reduced, the surface contact pressure is increased, which is beneficial to running-in and air tightness. At the same time, when the piston goes down, easy to scratch oil; When the piston is upwards, it can 'float' on the oil film due to the 'oil wedge' effect of the oblique angle, without causing melting wear. The bevel angle of conical ring must be selected properly, generally at 20 ~ Within the range of 60. Pay attention to the bevel angle during installation, otherwise it will cause great oil leakage. Generally used for intermediate rings. (4)Trapezoidal ring, air ring with inclined sides. Due to the trapezoidal profile, when the ring moves radially, the backlash will change continuously, thus minimizing carbon deposition in the combustion chamber.
Nowadays, the adoption of custom piston rings in auto diesel piston ring company industry is quite common.
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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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