A dynamic model for pin coupling anti-rotation mechanism of automotive scroll compressor

Pin coupling anti-rotation mechanism is adopted in mechanically driven automotive scroll compressor due to its simple structure and high reliability. However, the sidewall of anti-rotation hole in pin coupling anti-rotation mechanism is easy to be worn out, deteriorating the performance of scroll compressor. To figure out the cause and take measures, a dynamic model for pin coupling anti-rotation mechanism is developed in this paper. The dynamic model takes two important factors into consideration, offsetting scroll wraps and radial compliance mechanism. Using the dynamic model, the contact force between the anti-rotation pin and anti-rotation hole can be determined, thus the wear zone can be predicted during one rotation cycle. A simulation program adopting the above dynamic model is developed to predict the performance of automotive scroll compressor. The error between simulated shaft power of compressor and experimental result is no more than 4% for all test conditions. The wear zone predicted by the simulation program agrees well with the actual scroll compressor which survived a durability test.