PROCEDURE FOR IN-PLACE DIAGNOSTICS OF MAIN BEARINGS WEAR IN INTERNAL COMBUSTION ENGINE Russian patent published in 2014 - IPC G01M15/04 G01M15/09 G01M13/04 

FIELD: instrumentation.

SUBSTANCE: invention can be used in diagnostics of internal combustion engines. The method consists in the measurement of oil flow rate through a bearing and determination of the degree of main bearings' wear. The method implementation involves setting of nominal rotation speed of a crankshaft, measurement of oil density, then pressure from oil cavities of every main bearing is supplied in turn to the diaphragm throttle device with the help of switches at built-in hydraulic lines, pressure difference at the diaphragm is measured by a differential pressure gauge, and the oil flow rate in the hydraulic line of the bearing being checked is calculated. Estimated value of clearance in it is defined as per the formula $$s_i\approx {(k\rho Q_i^2/\Delta p_i)}^{1/4},$$ where k stands for a trial coefficient (predefined for each engine type by measuring the required clearance with the engine pan demounting); ρ - for the engine oil density; Q_i - for the engine oil flow rate in the hydraulic line of a bearing; Δp_i - for the pressure difference at the throttle device diaphragm. Degree of wear for each main bearing is defined by comparing the obtained estimated clearance value to its permissible value for this bearing.

EFFECT: upgraded accuracy of determination of main bearing technical state.

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