Baotou North Ben heavy truck accessories piston ring is one of the key parts of the engine, its work directly affects the performance of the engine. At the same time, the piston ring is a consumable part, repair piston ring, usually to lift the piston, therefore, often to repair or replace the piston ring time as the engine of the first maintenance period.

As the Baotou North Ben heavy truck accessories to the high speed and strengthen the direction of development, the piston ring working conditions more and more harsh, its wear resistance also put forward higher requirements.

Wear and Influencing Factors of Piston Ring

The wear between the piston rings of the engine and the cylinder liner has the following characteristics:

1. Piston ring reciprocating motion between the upper and lower points, the speed changes from the static state to up to 30m / s or so, so repeatedly to make a significant change.

2. When reciprocating, the cylinder pressure varies greatly during the intake, compression, work and exhaust strokes of the working cycle.

3. Because of the impact of the combustion process, the movement of the piston ring is often carried out at high temperatures, especially the first gas ring, in the high temperature and pressure and combustion products produced by the chemical effect, the oil film is difficult to establish, to achieve complete Lubrication is more difficult, and often in a critical lubrication state.

According to the wear mechanism, the piston ring wear can be divided into normal wear and tear, wear wear (scratch, scratch), abrasive wear and corrosion wear. But these wear phenomena do not appear alone, but at the same time exist and interact with each other. According to the wear parts, the piston ring wear can be divided into sliding surface wear and wear and tear on the upper and lower face. In general, the sliding surface wear and tear than the upper and lower end face wear and tear, sliding surface is mainly melting wear and abrasive wear; upper and lower end face is due to the piston to do reciprocating movement caused by the impact of wear and tear.

The maximum wear of the piston ring sliding surface often appears in the cylinder top dead center position, because the high temperature gas, damage the oil film, causing easy to melt conditions, thus accelerating the piston ring wear. Usually the so-called normal wear and tear actually contains a slight wear and abrasive wear. Each ring ring sliding surface wear is not the same, the first air ring wear the largest, the second ring is about half of the first road, the oil ring wear the smallest. But sometimes the oil ring wear is greater than the middle of a few rings, which is due to the cylinder surface lubricating oil distribution and adsorption of impurities.

The wear on the upper and lower end faces of the piston ring is mainly due to the abrasive wear of the hard residue in the engine oil and the dust particles formed in the upper and lower end faces of the dust particles mixed into the atmosphere. However, when there is abnormal heat distortion of the piston, the groove side gap becomes small, it may occur melting wear.

There are many factors that affect the wear and tear of the piston ring. The material and shape of the piston ring, the material and structure of the cylinder liner piston, the lubrication state, the structure of the engine, the operating conditions, the quality of the fuel and lubricating oil are the main factor. Of course, in the same cylinder, the lubrication of the piston ring on the impact of wear is the largest, state. The ideal ring between the lubrication between the two sliding surface is a layer of uniform oil film, but this situation does not exist, especially the first air ring, due to the impact of high temperature, it is difficult to establish a better lubrication The

Piston ring of the anti-wear measures

There are many factors that affect the wear of the piston ring, and these factors are often intertwined. In addition, the type of engine and the use of different conditions, the piston ring wear is also very different, and thus can not only improve the piston ring itself, the structure and materials to solve the problem, mainly from the following aspects: piston ring and cylinder Materials and good match; surface treatment; structural state; choice of lubricants and additives; due to assembly and operation of the heat caused by the cylinder liner and piston deformation.