Research on loading-transport machine parts in order to determine the causes of defects

  • 1 University of Chemical Technology and Metallurgy, Sofia, Bulgaria
  • 2 University of Chemical Technology and metallurgy, Sofia, Bulgaria


Possible defects in the system: piston-cooling jacket occur for various reasons. This system work in severe conditions: heat load; variable gas pressure and mechanical friction, which requires high strength, good wear resistance with limited lubrication and overall high resistance to abrasion, corrosion and other wear.The operation of the cylinder-piston group with insufficient or poor quality oil is the most common cause of overheating or engine blockage. Seizing of one or more pistons leads to major engine repairs or even scrappin g. Damaged fuel injectors, inaccurate injection or ignition timing can also cause the mechanism to melt or puncture. Therefore, it is essential to identify the exact causes of defects in the system and look for ways to prevent them.
Studied details were functioned under the identical conditions of good lubrication and no overheating. The reason, apart from the ones mentioned above, which led to their destruction, has been established.



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