TECHNOLOGY OF MODIFICATION AND RECOVERY OF THE ELEMENTS OF FUEL INJECTION EQUIPMENT
Applied in the elements of fuel injection systems of automobile, to strengthen plunger pairs of fuel pumps of diesel, needles of atomizers.
Technology characteristics Plunger pairs and injector spray nozzles are precision pairs of a friction. 
The working medium for these pairs of a friction is diesel fuel, having 300 times lower tribotechnical characteristics compared to oils. In the study of a large number of plunger pairs of fuel pumps, it was found that the greatest wear of the plunger surface is observed on its head from the side opposite to the working cut off spiral in the zone where the impact of the maximum pressing forces of impact character is superimposed on the action of the plunger movement at maximum speed.
On normally working sections of the precision surface of the plungers and spray needles, thin layers oriented along the direction of motion are fixed, and numerous cases of failure of solid particles of secondary friction structures of complex composition containing sulfur, phosphorus and other elements present in the additives are recorded. These particles abrasively wear the working surfaces of precision details. As a result of the wear, the surface microrelief changes, manifested as scoring, longitudinal grooves with torn edges. The wear of this kind is observed on the surfaces of the following parts: the plunger head section, located opposite the inlet window of the sleeve — the area around the inlet window of the sleeve. The developed technology of deposition of multilayer coatings on the basis of carbon makes it possible to increase the service life of the fuel systems elements by reducing the coefficients of friction, wear and hardening of the contacting surfaces. It is possible to precipitate an outer layer based on fluoropolymer in order to render the system hydrophobic in oils and fuels.
Advantages of the coatings developed
- Increase in the resource of work for more than 3 times.
- High anti-seize, abrasive resistance of friction pairs.
- Hydrophobic effect in oils and fuels.
- Environmentally friendly technology.
Parameters of technology
- Thickness of coatings is 0.5-1.5 μ
- Hardness up to 25,0 GPa.
ALEXANDER ROGACHEV,
DIRECTOR OF PHYSICO-CHEMICAL RESEARCH AND DEVELOPMENT INSTITUTE,
CORRESPONDING MEMBER OF THE NATIONAL ACADEMY OF SCIENCES OF THE REPUBLIC OF BELARUS,
DOCTOR OF CHEMICAL SCIENCES, PROFESSOR,
tel. (+375 232) 50 38 03, fax (+375 232) 51 00 77,
e-mail: rogachevav@mail.ru,
http://nis.gsu.by