Akademik Veri Yönetim Sistemi
Tezin Türü: Yüksek Lisans
Tezin Yürütüldüğü Kurum: Marmara Üniversitesi, Fen Bilimleri Enstitüsü, Türkiye
Tezin Onay Tarihi: 2024
Tezin Dili: İngilizce
Öğrenci: HÜSEYİN GÖKBERK TARÇIN
Danışman: Cenk Sayın
Özet:
In gasoline vehicles, the fuel pressurized
in the pump is carried to the injectors with the rail and the injector keeps
the fuel it receives inside the cylinder block at the desired angle. This
phenomenon is called direct injection. In these systems where the injector is
located, the tightness of the fuel and hot air gases plays a major role in
terms of function and safety. The connection between the injector and the rail
where the tightness is seen is used by several different methods in the
industry, and the most common techniques among these are rubber O-rings and
threaded apparatuses. The use of rubber-based O-rings in the automotive
industry is regulated by DIN, ISO and EN standards. The surface geometries and
O-ring materials on which the parts can be used are also specified in these
standards. However, the determination of these values directly depends on
private institutions.
Due to the differences between the fuel
standards of the countries, the fuels that the O-rings are exposed to vary.
However, the wear rates of the fuels vary within themselves and their effects
on the O-rings are also different. In this thesis, the behavior of gasoline
injector O-rings under fuels with different abrasion values will be examined by
experimental fuel tests, and the wear correlation between O-ring and fuel will
be determined through volumetric, hardness and strength changes. In order for
the test results to be comparable, the O-ring material and geometry will be
accepted as the whole singular value, while other parameters will vary.
O-rings with round cross-sectional area are
mostly used in the industry, and the geometry where the part will be kept is
adjusted to suit the radial insulation configuration, and this area where the
insulation is made is called the hydraulic connection. In this configuration,
the geometric parameters determine how much the pressed O-ring will swell. If
the part does not swell enough after pressing, the sealing function cannot be
fulfilled, which causes fuel leakage and pressure drop in the system.
While the fact that the fuel does not leak
in the hydraulic connection is taken as a basis, the assembly, materials,
weight, and price of the parts are also the values that are taken into
consideration. In this sense, in the thesis, it is aimed to create different
configurations of the hydraulic connection in accordance with the ISO 3601
standard by mathematical modeling and to present the optimal configuration.
The output of the studies aims to provide a guide for the sealing
function of gasoline injectors used and to be used in the industry, and to
provide a content that will be useful in determining the conditions of use of
the existing parts.