Improving the Reliability of Automotive Engines Improve Turbocharger Bearing Assembly Lubrication.

Abstract

In work the results of research directed on increase of reliability of turbocompressors of autotractor diesel engines are presented. The analysis of refusals of turbocompressors of TKP7H-1, their low resource, design features of a turbocompressor, and also theoretical consideration of course of working processes in its bearing knot allowed to draw a conclusion on insufficient efficiency of the organization of greasing of the bearing knot leading to braking of rotation of a shaft of a rotor due to formation of the closed cavity in bearing knot, and the 
low consumption of oil through a turbocompressor conducts to an overheat of the case, its thermal deformation and the subsequent jamming of a shaft of a rotor, and also the accelerated aging and waste of engine oil. The design solution proposed in work realized in the form of a repair kit and the developed technology of repair of turbocompressors of TKP7H-1, allowed to improve considerably conditions of greasing of bearing knot that led to decrease in hydraulic resistance to rotation of a shaft of a rotor and increased its frequency of rotation for 
12700 min–1. Owing to increase of frequency of rotation of a shaft pressure of pressurization increased by 0,014 MPas that improved technical and operational indicators of the engine. The increase in a consumption of oil through a turbocompressor led to decrease in temperature of the case of a turbocompressor to 32 %, and oil temperature from 10,3 to 12 % depending on temperature condition of work. The proposed solution allowed to lower a share of refusals of turbocompressors in operation by 35 % due to decrease in thermal intensity of the case that excluded emergence of such refusal as jamming of a shaft of a rotor and excluded an oil overheat that led to increase of reliability of work of a turbocompressor.