Piston rings are one of the key components of an engine, and their performance directly affects the engine's performance. At the same time, piston rings are also vulnerable parts. When testing piston rings, the piston is usually lifted out. Therefore, the time for testing or replacing piston rings is often taken into account. The piston rings of the engine are one of the key components of the engine, and their performance directly affects the engine's performance. At the same time, piston rings are also vulnerable parts. When testing piston rings, the piston is usually lifted out. Therefore, the time for testing or replacing piston rings is often regarded as the next testing period for the engine.

In recent years, as engines have been developing towards high speed and strengthening, the working conditions of piston rings have become increasingly strict, and higher requirements have been put forward for their wear resistance.

Wear of piston rings and its influencing factors

automotive interior accessories The wear between the piston rings and cylinder liners of the engine has the following several characteristics:

1. The piston rings perform a backward movement between the high and low dead centers, with the speed changing from a stationary state to approximately 30m/s. This process is repeated with significant changes.

2. When performing the reverse cycle, the cylinder pressure changes significantly during the intake, compression, power generation and exhaust strokes of the working cycle.

3. Due to the influence of the incineration process, the movement of piston rings often takes place at high temperatures, especially for gas-gas rings. Under the influence of high temperature and high pressure as well as the chemical effects produced by incineration products, the oil film is difficult to break, making it rather challenging to achieve complete lubrication and often leaving them in a critical lubrication state.

According to the wear mechanism, piston ring wear can be classified into abnormal wear, fusion wear, abrasive wear and corrosion wear. However, these signs of wear and tear do not occur alone but coexist and influence each other. According to the worn parts, piston ring wear can be further classified into sliding surface wear and high and low end face wear. Individually speaking, the wear on the sliding surface is greater than that on the high and low end faces. The main types of wear on the sliding surface are fused wear and abrasive wear. The wear on the high and low end faces is mainly caused by the impact resulting from the piston's movement back.

The wear of the sliding surface of the piston ring often occurs at the top dead center of the cylinder. This is because the high-temperature gas at this location damages the oil film, creating an environment prone to melting and thus accelerating the wear of the piston ring. The so-called abnormal wear usually includes slight melting wear and abrasive wear. The wear amounts of the sliding surfaces of each ring are different. For instance, the wear amount of the gas ring and the second ring is approximately half of that of the oil ring. For example, after a 500-hour durability test of the piston rings installed on the Steele WD615 engine, the wear of the opening gap of the gas ring is 0.4 to 0.6mm, and that of the second ring is 0.25 to 0.4mm. The wear of the oil ring opening gap is 0.3 to 0.55mm. However, sometimes the wear of the oil ring is even greater than that of the several adjacent rings. This is due to the influence of the nominal lubricating oil distribution in the cylinder and the adsorption of impurities.

The wear of the high and low end faces of piston rings is mainly due to the mechanical grinding formed by hard residues in engine oil and fuel as well as dust particles mixed in from the atmosphere on the high and low end faces. In essence, it is abrasive wear. However, when abnormal thermal deformation of the piston occurs and the side clearance of the ring groove decreases, molten wear may also happen.

There are many factors that affect the wear of piston rings, among which the material and shape of the piston rings, the material and structure of the cylinder liner piston, the lubrication condition, the structural form of the engine, the operating conditions, and the quality of fuel and lubricating oil are important factors. Of course, in the same cylinder, the influence of lubrication conditions on the wear of piston rings is... State. The imagined lubrication between the annular surfaces is that there is a uniform oil film between the two sliding surfaces. However, this situation does not actually exist, especially for the Dao gas ring. Due to the influence of high temperature, it is difficult to achieve a more imagined lubrication condition.

The anti-friction methods for piston rings

Because there are many factors influencing the wear of piston rings, and these factors are often intertwined. In addition, the wear of piston rings varies greatly depending on the type of engine and its application conditions. Therefore, the problem cannot be solved merely by improving the structure and materials of the piston rings themselves. It is important to start from the following aspects: the materials of the piston rings and cylinder liners and their good matching. Nominal processing; Structural condition; Selection of lubricating oil and additives; Deformation of cylinder liners and pistons caused by heat during assembly and operation, etc.

automotive interior accessories https://www.yuanda-export.com/aluminum-alloy-floor-for-denza-d9-accessories-luxury-high-level.html