Abstract
The development of scientific hypotheses and approaches to improve the strategy of maintenance and repair of agricultural machinery is becoming one of the most relevant areas in the agro-industrial complex, since it is of paramount importance in the technical support of the machine and tractor fleet throughout the entire life cycle of machines. (Research purpose) The research purpose is in studying the methods of searching for defects of internal combustion engine on the example of the connecting rod of the tractor engine K-744. (Materials and methods) The study of methods and means of controlling parts of automotive internal combustion engines during defects and repairs are conducted. Authors developed an automated interactive system with software for monitoring these parameters on the example of the connecting rod of the K-744 tractor engine. The article proposes a new maintenance strategy based on the use of multiple tolerances, each tolerance corresponding to a certain wear rate of the part. As a result of this strategy, the failure rate is significantly reduced and the average service life increases. (Results and discussion) The article presents the experimental data on the wear of the surface of the lower connecting rod head by the angle of rotation of the internal meter. Measurements were carried out on a special installation consisting of a controlled connecting rod of the YaMZ, an internal measuring device of the NI brand-75-100-1, two metal washers with a diameter of 93 and a thickness of 7 millimeters and a micrometer of 0-100 mm, designed for calibration of the internal measuring device. (Conclusions) The experimental dependences of the surface wear of the lower connecting rod head on the angle of rotation of the internal meter for different connecting rods in three sections in height at an equal distance between themselves are 13, 20 and 27 millimeters in height of the lower connecting rod head.
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