Automotive Air Conditioning Compressor Motion Accuracy Analysis And Tolerance The Optimization Design

Variable displacement SD7V16 automotive air conditioning compressor, the key institutions swinging oblique disc drive mechanism, Spindle of highspeed rotation, can be passed for piston compression and exhaust, expansion and breathe in the working process of the four.The change of inclined plate Angle SD7V16 used to change the piston stroke, so as to realize displacement can change continuously, finally realizes the SD7V16 corresponding refrigerating capacity can be matched at any time according to actual working condition.SD7V16 automotive air conditioning compressor has seven piston and cylinder, by a minor deviations deviation caused by the displacement of the piston stroke may not feel the macro.For the main shaft to allow continue to speed up to 7000 r/min, if the seven pistons have a certain degree of deviation, for a period of accumulation of total displacement deviation, cannot be ignored, may even affect the macro on automobile air conditioning refrigeration effect.Therefore, the transmission mechanism on the swing SD7V16 swashplate motion accuracy analysis and tolerance optimization design is of great significance.In this paper, in order to SD7V16 swing swashplate transmission mechanism as the main research object, on considering the capacity of key parts size tolerance optimization design.The full text specific research content is as follows:1.Introduced the structure of SD7V16, analysis SD7V16 automotive air conditioning compressor thermal control principle and control principle of displacement.Also introduced the refrigerant R134 a, refrigeration performance parameters COP and displacement and refrigerating capacity calculation.For SD7V16 swash plate Angle and the relationship between the piston stroke experiment, 24 groups of data, the curve fitting of experimental data and theory to calculate the equation of the curve comparison and analysis.On a certain condition SD7V16 refrigerating capacity was calculated.2.According to the key institutions SD7V16 transmission principle, mathematical model is set up, the kinematics analysis was carried out on the key institutions.The piston is obtained the formula of displacement, velocity, acceleration, and then the geometry algorithm of displacement.Introduction of key parts size deviation, this paper analyses the piston movement precision, and its influence on displacement movement precision. SD7V16 key institutions through Adams virtual prototype simulation, simulation results verify the feasibility based on the mathematical model of theory, calculation result is correct.3. According to the calculated displacement as a function of the key dimensions, and according to the displacement as a function of refrigerating capacity.And then calculate the capacity as a function of the key dimensions.When solving the maximum 24 ° inclined plate Angle, refrigerating capacity deviation ?Q0 and compressor size tolerance of partial differential equation. The key parts as the key components of size tolerance optimization performance constraints.Finally introduce the key machining precision parts size tolerance of economic constraints, combined with the survey data. To the quality loss cost with processing cost to Summation as the objective function. Based on MATLAB genetic algorithm, solving consider product cooling performance of tolerance optimization design.