Study On The CAD/CAE Integrated Technology Of Involute Gear In Pump

Gear pump is used widely in the hydraulic system such as machine tool, light industry, shipping, oil chemicals etc. The quality and capability of gear pump affect the characteristics of machines directly. With the progress of hydraulic system, it is appealing the high quality gear pump. The higher quality gear pump is requested.The new CAD and CAE technologies are appearing with the development of science and technology. At the same time the manufacturing is bringing informationilization into effect. The base of informationilization is digital design. In order to use digital design in the gear pump field, an integrated system of CAD/CAE for involute gear is developed in this dissertation. This system is high efficient and intelligent. Although this system was developed depended on the features of gear pump, it can be used in all kinds of cylindrical involute gear. This system has great significance for realizing digital design, for shortening the time of design, for improving the quality of gear, etc. The main results and the creative ideas are summarized as follows:1. Based on the profile features of involute gear in gear pump, the active profile and the fillet of gear are analyzed according to the mesh theory. The equations of involute profile and fillet are worked out. Based on analysis of the mesh process of gears, it's pointed out that the traditional calculation formula of involute gear's contact ratio is not suited for calculating the gear's contact ratio in the pumps with some parameters, and a suitable formula is offered in this dissertation.2. Depended on the profile equations of involute gear, the intersection points ofthese curves are worked out by numerical method. The effective ranges of these curves are determined by these points. The whole profile can get by linking these effective curves together in proper order. A Visual Basic 6.0 program is developed to draw the whole profile automatically.3. Selected the ZRCAE as a CAE software, the form of input data was dissected deeply. The input data of ZRCAE was gained from the results of CAD calculation for gear. This process realized the seamless integrated of parameters design and CAE for involute gear. This can let designer to get rid of the constraint of modeling of involute gear completely, improves the efficiency and quality of gear design greatly.4. An automatic 3D modeling of involute gear is gained by a Visual Basic program depended on the precise profile and SolidWorks. The 3D modeling is the foundations of dynamic imitation and simulative assemble.5. Referenced other gear pump optimizing calculation and combined the feature of gear pump, a kind of optimizing calculation method of gear pump is put forward. And the optimized model of involute gear for gear pump is built. These can improve the characteristics of gear pump.