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How Much Do You Know About The Wear And Influence Of Engine Tool? Sep 07, 2017

How much do you know about the wear and influence of Engine Tool?
In recent years, due to the engine to the high-speed and strengthen the direction of development, Engine Tool working conditions more and more harsh, its wear resistance also put forward higher requirements. Today we are under the Engine Tool wear and influence factors
Automotive engine Engine Tool and the wear between the cylinder liner has the following characteristics:
1. Engine Tool in the upper and lower points between the reciprocating motion, the speed changes from the static state to up to 30m / s or so, so repeatedly to make a significant change.
2. In the reciprocating motion, the cylinder pressure changes 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 Engine Tool 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, It is difficult to achieve complete lubrication, and often in a critical lubrication state.
According to the wear mechanism, the Engine Tool wear can be divided into normal wear and tear, wear wear (scratches, abrasions), abrasive wear and corrosion wear. But these wear phenomena do not appear alone, but at the same time exist and interact with each other. In accordance with the wear and tear, the Engine Tool wear can be divided into sliding surface wear and wear and tear face up and down. In general, the sliding surface wear and tear than the upper and lower face wear and tear, the sliding surface is mainly the wear and abrasive wear and tear; upper and lower end face is due to the piston reciprocating movement caused by the impact of wear and tear.
The maximum wear of the Engine Tool's sliding surface often occurs at the top of the cylinder because it is subject to high temperature gas and destroys the oil film, creating conditions that are easy to melt, thus accelerating the wear of the Engine Tool. Often 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. For example, the Engine Tool installed on the Steyr WD615 engine after 500h reliability test, the first air ring opening gap wear 0.4 ~ 0.6mm, the second opening gap wear 0.25 ~ 0.4mm, oil ring opening gap Wear is 0.3 ~ 0.55mm. 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 of the upper and lower end faces of the Engine Tool is mainly due to the mechanical abrasion of the hard residue in the engine oil and the dust particles formed from the atmosphere into the upper and lower end faces, which are essentially abrasive wear. However, when there is abnormal hot deformation of the piston, ring groove backlash becomes small, it may occur melting wear.
There are many factors that affect the wear of the Engine Tool. The material and shape of the Engine Tool, the material and structure of the cylinder liner piston, the lubrication state, the engine structure, the operating conditions, the quality of the fuel and lubricating oil are the main factors. Of course, in the same cylinder, the lubrication of the Engine Tool wear is the greatest impact, it can be said that the Engine Tool wear depends largely on the lubrication 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 T
 Engine Tool are usually cast with gray cast iron, to improve wear resistance, mostly chrome plated or sprayed copper. Tests show that chrome can increase the wear resistance of the ring 2-3 times, the maximum wear of the cylinder can also be reduced by 20% -30%. As mentioned earlier, wear generally occurs in the abnormal state, if repeated this problem, the owner should review their own driving habits and maintenance methods. The following describes the main form of Engine Tool wear.