毕业论文求英文翻译i，不要网上在线翻译~~~谢谢~~~

The rotation of ball screw nut inside the ball from rolling motion as compared to the conventional sliding screw with high mechanical efficiency, the need to slide the screw torque is only 1 / 3 of the following, we can use a small twist have a great moment of the axial force. Ball Screw loop structure are: internal circulation structure, outside the loop structure, cover structure, back to the bead groove structure. Which, outside the circle of class size is generally connected to the installation of ball screw with the specifications than the internal cycled large. Loop structure within the shape of the reverse variety of devices, used mainly round and oval shape. The inverter with a floating circular adaptive function, also known as floating inverter internal circulation, better than the smooth elliptical structure of the oval-shaped structure of manufacturing is relatively simple, so the two forms has become mainstream. The graduation project is based on the outer loop based on ball screw geometry modeling