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Identyfikacja mechanizmu powstawania uszkodzeń aparatury wtryskowej silników o zapłonie samoczynnym

Ignaciuk P., Gil L., Walczak M.

Postępy Nauki i Techniki

2012

Nr 12

53-60

W pracy zaprezentowano rezultaty badań sekcji tłoczących pomp wtryskowych. Do badań zużycia i morfologii powierzchni sekcji tłoczących wykorzystano metodę mikroskopii skaningowej, analizę EDX i profilomet stykowy. Celem badań było określenie wpływu biopaliw i oleju napędowego na zużycie sekcji tłoczących. Przedstawiono wyniki badań zużycia sekcji tłoczących pompy wtryskowej firmy MOTORPAL wykorzystywanej w silniku 4CT90.

The results of a study of the pumping sections of injection pumps are presented. The wear and surface morphology of pumping sections were studied by using scanning electron microscopy with electron diffraction spectroscopy and profilemeasurement gauge. The aim of the study was to evaluate the influenceof biofuel and diesel fuel on wear of pumping sections. Verificationwas done using injection pump Motorpal used in a 4CT90 diesel engine.

Surface durability of steel rollers lubricated by fresh and used engine oils in comparison with gear oil

Ishibashi A., Sonoda K., Sunagawa Y., Shoji R.

International Journal of Applied Mechanics and Engineering

2004

Vol. 9, no spec.

79-85

The lubricating oil used for the gasoline engine of passenger cars has been exchanged for a fresh oil after running a distance in the range of 3.000 to 10.000km, in Japan, in most cases. In the present investigation, used engine-oils were obtained by two different methods; (1) the oils were gathered at a car service centre, or (2) produced using test cars and fresh engine oils. The fresh and used engine-oils were chemically analysed and the amounts of nine elements (S, Cl, P, Zn, Pb, Mo, Fe, Al, Ca) in the oils were compared with those of a gear lubricating oil. Using a four ball tester, scoring load for the test oils were measured and then surface durability tests were conducted using a two roller testing machine. Many pits occurred at a Hertzian contact pressure of 1.000MPa on the steel rollers with a hardness of 180HB when a fresh engine-oil or the gear oil was used for lubricating the rollers. However, not a single pit occurred at the same contact pressure up to 10 million rotations when the used engine-oil was used. The reason for the higher surface durability was explained using the results of the chemical analyses and scoring tests.