Improving the Reliability of Automotive Engines Improve Turbocharger Bearing Assembly Lubrication.
Keywords:
bearing, turbocharger, lubrication, automotive enginesAbstract
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 thelow 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.
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