Virtual Prototype Design Of TI Worm Driving And Structural Modal Analysis

Involute single enveloping hourglass worm driving as single enveloping TI worm driving, consists of involute helical gear and hourglass worm enveloped by the gear. TI worm driving has the advantages of high transmission efficiency, big carrying capacity and other characteristics, it is a very promising drive form. This paper mainly research on single enveloping theory, accurate three-dimensional model, dynamic simulation analysis and structural modal analysis of TI worm driving. The main research contents are as follows:Firstly, according to the theory of gear meshing, the equations of TI worm tooth surface are deduced, the mathematical model of TI worm driving is established.Secondly, due to the complexity of TI worm tooth surface, traditional software has much difficulty to establish the precise model directly, so summarize forefathers’experiences, propose a modeling method of TI worm driving based on UG in this paper. The solid models of TI worm and involute helical gear are established combine with UG/Open GRIP language and all kinds of UG Boolean operations, and the assembly model of TI worm driving is completed. This modeling method avoids the interface problem for using multiple softwares, and maximizes realization of the parametric design, greatly facilitates model modification.Again, the virtual prototype model of TI worm driving is established in software ADAMS and simulates it, by entering the movement of active worm, the speed of driven bevel gear shaft and the change law of the meshing force of worm driving are obtained. The problems in the model can be founded as soon as possible, and also certain basis for physical prototype manufacturing are provided, shorten the product development cycle, reduce the development cost by using virtual prototype technology.Finally, according to the theory of vibration, the modal analysis of structures which TI worm and involute helical gear is completed. Dynamic characteristic parameters are obtained by modal calculation, they can provide reliable basis for the fault diagnosis of system as well as laid the foundation for the dynamic response calculation and analysis of system.