Analysis And Improvement Of Mechanism Dynamics Of Swash Plate Variable Displacement Compressor

Swash plate type variable displacement automotive air conditioning compressor can automatically adjust the displacement of compressor in any engine speed according to the temperature inside car, its efficiency and comfort was significantly better than swash plate type fixed displacement compressor, so air conditioning systems of medium-high grade car increasingly choose to use swash plate type variable displacement compressor, Noise and Vibration of swash plate variable displacement compressor therefore cause more and more concerns.In this paper, the standard structure and several different structure of 6SE16 compressor are tested to its noise and vibration performance. Experimental data shows noise of compressor at idling non-working state is too large, sometimes even greater than noise of stable working state. Further analysis shows mechanical noise of compressor mainly come from the impact of friction between piston and sliding shoe, dynamic unbalance of spindle swash plate structure, the reset spring elasticity and valve slice.Dynamic unbalance is an excitation source of compressor’ noise and vibration, the dynamic unbalance of compressor and its parts including drive plate, swash plate hub, swash plate and piston are calculated. According to varying characteristics of dynamic unbalance, the appropriate objective optimization function, design variables and optimization algorithms are selected. Based on optimization result, the quality and centroid position of drive plate and swash plate hub are practically changed in projects. It shows noise and vibration values of improved compressor significantly reduced when comparing before and after improved compressor.According to dynamic simulation of 6SE16 compressor, unbalance inertia force of the left and right bearing is fit with theoretical calculations. Based on theoretical calculation, the piston gas force and interaction forces between the various parts are simulated, which can provide guides for mechanism improvement structural and components design.