Study On Close Type Of The Double Enveloping Cycloidal Planetary Transmission

The project originates from the National Science and Technology Supporting Program, named"The Research on Cycloid Enveloping Planetary Precision Transmission"(No. 2006BAF01B08). Precision transmission is a kind of mechanical transmission mainly focuses on transmitting movement and power in high precision, it is widely used in many areas, such as aviation and spaceflight, NC machine tools, weaponry and equipment, robot, printing and packaging machinery, precision machinery, transportation machinery, medical apparatus and so on. Precision transmission is an important basic component in manufacturing and equipment industry, national defense industry. The double-enveloping cycloidal planetary transmission is a new kind of transmission, which is the innovation and development in the field of cycloid type planetary transmission. The cycloidal meshing pairs possess the characteristics of multi-tooth meshing, and double line contact of the pair of gear tooth in some field are also existed. Furthermore, the induced normal curvature of contacting point approaching to zero. It is exactly these characteristics improving the load capacity and lubricity of the sets. Besides, the contact point's increasing plays the averaging effect of errors fully, which is beneficial to improving the transmission precision. Therefore, it has important theoretical significance and reference value in the engineering practice to develop studies deeply and systematically on the structure design and experimental research.Major contents of the thesis as follows:â‘ Based on brief introduction of the theory about double-enveloping planetary transmission, the basic meshing characteristics of it is discussed. And the foundation of the design on cycloidal meshing pairs is established.â‘¡By the analysis of the existing double-enveloping planetary transmission, learn more about the basic principle of double-enveloping and planetary transmission. Do structure innovation on double-enveloping planetary transmission found on the principle, three structure forms were discussed and one double-enveloping planetary prototype was designed.â‘¢Complete the engineering drawing of all parts for the prototype. Selecting materials and thermal treatment mode based on the characteristic, discussed the processing technology and finished the assembling and debugging about the prototype. â‘£Experimental equipments are developed or refitted. Experimental study on doube-enveloping planetary prototype is carried out, which includes transmission precision and backlash, and the experimental date are analyzed and discussed.