Introduction. Up to 23% of all cylinder blocks of used engines D-245 and D-260 have worn out sockets for the liner sleeve collar in-depth and shall be discarded. The aim of the study was to increase the durability of the cylinder blocks of the mentioned above engines by processing the sockets in the repair size with the subsequent installation of adjusting washers. Materials and Methods. In the article, the method of dimensional analysis was used to solve the problems. Based on the data presented in the technical documentation, the dimension chains were calculated when the piston moves to the lower and upper dead center. Results. The conducted studies of dimension chains found that when the piston moves to the lower and upper dead center with gaps in the joints corresponding to the new units, the distance between the bottom of the piston and the head of the unit can be from 0.488 to 1.592 mm, and with gaps corresponding to the permissible during operation – from ‒0.035 to 1.15 mm. According to the results of calculations, the depth of the socket under the liner collar in the boring process should be within 9,4+0,08+0,04 mm, i.e. in the range of 9.44...9.48 mm. Discussion and Conclusion. As a result of the study, the dimensional analysis found that the permissible value for milling the block stopping plane is 0.35 mm, and the depth of the liner collar when installing the adjusting washer with a thickness of 0.4 mm shall be from 9.45 to 9.47 mm.
Introduction. In this article the study subject is the power supply system of the pre-start heater. The purpose of the study is to evaluate the possibility of using a thermoelectric generator to power the liquid preheater with optimization of the flow section of the thermoelectric generator heat exchanger. Materials and Methods. It is proposed to use a thermoelectric generator as an additional energy source to reduce electric power consumption by a pre-start heater. In the course of the study, various structures of the flow section of the thermoelectric generator heat exchanger have been modeled. The thermal and hydrodynamic analyses were carried out in the software environment ANSYS Workbench, Solidworks Flow Simulation to develop the most effective design for the flow section of the thermoelectric generator heat exchanger Results. An experimental installation was assembled and the dependence of the temperature modes of the pre-start heater on the output parameters of the thermoelectric generator was determined. Discussion and Conclusion. It has been proved the possibility of reducing the power consumption of the vehicle battery during thermal preparation of the internal combustion engine by using a thermoelectric generator adapted to the power supply system of the liquid pre-start heater.
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