There are many reasons for the oil saw cylinder, for the general users and even many technicians engaged in the relevant work, to be quick and accurate.
It is not easy to determine the cause of the failure. Today, I made an analysis of several major reasons for the cylinder, hoping to be able to.
It will be helpful to users and maintenance personnel.
When the engine is working, the piston and piston ring are reciprocating in the cylinder. The large expansion thrust, piston and work produced by the mixture combustion.
The plug rings are closely connected with the inner wall of the cylinder through the oil film formed by the oil. In normal circumstances, the piston and the piston work due to the isolation and cushioning of the oil film.
The plug rings are not directly in contact with the cylinder, but in certain cases, the two will contact directly, causing sliding friction and producing a large number of them.
Heat, if the heat dissipation condition cannot be improved effectively, may melt piston, piston ring or cylinder inner wall metal surface, make sliding friction surface fuse in.
Together, in the piston high speed movement to produce the longitudinal pull mark, in serious time both hold the death, namely the so-called pull cylinder phenomenon.
The main reasons are as follows:
1. The engine is running low in the initial stage, and the cylinder is caused by high-speed operation.
For the newly assembled engine, the seemingly smooth surface of the cylinder and the outer surface of the piston and piston rings are in fact measured by numerous microns.
The uneven bumps make up, before the engine can actually run as it wants, it has to be combined with the surface before it is cut off.
The sharp peak, make the surface smooth, the force is uniform, the slide is not interlocking, the operation can smooth. Therefore, the new engine must come in after assembly.
To a certain degree of grinding. Otherwise, in the piston, piston ring and cylinder on the high rise on the surface, will bear the concentrated load, its unit surface.
The pressure of the product is very large, the temperature rises after friction, and the protrusion softens and melts, so that the cylinder is pulled.
2. Cylinder caused by overheating of piston.
Local abnormal expansion occurs when the piston overheats. Due to the piston deformation, the piston ring groove is twisted into a wavy shape, and the piston ring and ring groove are short.
Even a long bite together, causing the piston ring to be unable to work properly. At this time, the edge of the piston ring with extremely high unit area pressure and cylinder.
The direct contact of the inner wall causes the piston ring not only to lose the function of sealing gas, but also to destroy the oil film on the inner wall of the cylinder.
Cause the cylinder.
The main causes of piston overheating are:
The poor quality of gasoline produces high temperature caused by abnormal combustion of mixture.
The oil supply system, ignition setting or adjustment is bad, resulting in the abnormal combustion of the mixture and the high temperature;
The piston body design is bad or the density difference of the piston aluminum parts makes the piston overheat due to the insufficient heat transfer from the piston to the cylinder.
The external cooling of the engine is not sufficient to cause overheating.
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