Aiming at the problems that the pin anti-rotation mechanism of electric scroll compressors was prone to wear and even fracture due to large contact loads, several methods were studied to optimize the load on the mechanisms. By analyzing the orbiting moments of the orbiting scroll, the variation laws of the orbiting moments induced by gas forces and rotating back-pressure oil forces with rotational speed were investigated. A mechanics model of the pin anti-rotation mechanisms with clearances under the orbiting moments was established, and the contact angles between the ring and pins were calculated for different numbers of pins. Load reduction methods were studied from three aspects: the number of pins, tooth tip modification, and the bottom plate structure of the orbiting scrolls. The anti-rotation mechanisms of a prototype was optimized using these methods, and the contact loads and lubrication conditions of the pins were compared before and after optimization. The results show that the orbiting moments caused by back-pressure oil increase with rotational speed. Increasing the number of pins, reducing the modification angle and offset of tooth tips, adjusting the position of the primary balance groove, and adding an inner pin at the center of the ring groove when the number of pins is even may effectively reduce the contact loads on the pins. After optimization, the peak contact forces of the pins decrease by 70.1%, the average contact forces decrease by 61.3%, and the lubrication conditions of the pins are improved.
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