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REPUBLIC OF SERBIA MINISTRY OF DEFENCE
MINISTRY OF DEFENCE Material Resources Sector Defensive Technologies Department
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DETERMINING OF WORKING TEMPERATURE OF ISOLATION BAR IN "START RESISTANCE BOX" OF COMBAT VEHICLES PREHEATER MOTOR AND INVESTIGATION OF POSSIBLE REPLACEMENT MATERIAL FOR BAR
Dragi LakiČeviĆ Military Technical Institute, Belgrade, dragilakicevic@gmail.com Jovan RaduloviĆ Military Technical Institute, Belgrade, vti@vti.vs.rs Goran Jerkin Military Technical Institute, Belgrade, goranjer@yahoo.com Dragan Munitlak Technical Overhaul DEPARTMENT, Čačak, draganmunitlak63@gmail.com
Abstract: Problems, work methodology, realization procedure and testing of the proposed solution of possible replacement material for production of an isolation bar in "start resistance box" (SRB) which is used as resistor carrier, in current circle of electromotor of combat vehicles motor preheater are presented. The basic goal of this paper is investigation of possible material for production mentioned bar instead of previously used and now not available material based on asbestos paper, melamine and phenol resins. The cause of a degradation of bar in SRB, as well as a way a working temperature measurement in real exploiting conditions, are described. Results of temperature measurement in critical places on a bar, necessary for a choice of possible replacement material for bar, are presented. Based on the obtained temperature and other parameters’ measurements results, among eventually possible materials replacements for bar production, pressed material based on nature resin (shellak) and mica was chosen. The working tempеrature measurement in conditions very close to the real ones, using bar made of possible replacement material, are repeated. The obtained acceptable results were a base for further activities, which implies determination of possible replacement material properties in laboratory and investigation of bar in real exploitation conditions. Кey words: Combat vehicles, preheater motor, isolation bar, material replacement.
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