| As a new type spiral bevel gear transmission,double circular arc spiral bevel gear (DCAPSBG) mesh at convex and concave tooth profile in both longitudinal and latitudinal direction which applied double-circular arc tooth on spiral bevel gear. Therefore, it has higher tooth surface contact strength and tooth root bending strength than Gleason spiral bevel gear, which has been proved by product experiments. For the reason that gear tooth surface geometry of DCAPSBG is complex and lack of researchers and further study, these limit its popularization and application in our country. Research meshing characteristics of DCAPSBG using simulation analysis is an effective way to further study its meshing performance. Thus based on the meshing theory of DCAPSBG, this paper researches on the meshing performance of DCAPSBG applying line graph method, tooth contact analysis (TCA) and virtual simulation manufacturing and experiment, and lays a foundation for further study, application and popularization of DCAPSBG.In the thesis, the research achievements and creative contents include:1)According to cutting principle of DCAPSBG, cutting and meshing analysis is carried on, equation of generating gear tooth surface and the equation of action line in the processing of cutting tooth as well as the tooth surface equations of DCAPSBG are established using kinematics method.2) According to contact ratio definition of the spiral bevel gear, the contact ration definition of DCAPSBG is proposed; The meshing process is analyzed using line graph method firstly, calculation methods of the contact ration, multi-point contact coefficient and multi-pair contact coefficient are established; The conditions of continuous transmission are proposed. Through the line graph method, the DCAPSBG tooth meshing process can be displayed visually, which has important significance for the design, strength calculation, reasonable selection of gear geometrical parameters and further study of its transmission performance.3) Based on TCA analysis principle, tooth contact analysis method which is suitable for DCAPSBG is established firstly; Geometric characteristics of DCAPSBG are analyzed, and TCA analysis software are developed using the hybrid programming method; In term of the developed software, contact point location, contact ellipse size, tooth surface contact area as well as the transmission error curve and other relevant graphics can be output. Which provide effective means and methods for the design of DCAPSBG.4) On the basis of DCAPSBG machining principle, the thesis proposed method and transformation formulas of machine adjustment parameters from traditional milling machine to CNC gear generator with Gleason milling machine as object; The program of solve parameters of axes motion is developed, which can generate NC (Numerical Control, NC) program; Simulation model (including the machine tool model, machine controllers, cutter header model and gear blanks solid model etc.) of DCAPSBG is established by Pro/E and VERICUT; Virtual simulation machining and actual generating tooth are completed with good effect.5)The influence of several individual installation errors on meshing quality of DCAPSBG is analyzed in the thesis; The correctness of the contact ratio formula is verified by using TCA; The results of simulation and experiments demonstrate that: there are two contact paths on gear tooth surface, the installation error impacts on tooth depth greater and impacts on the tooth length less. We should control dimensional tolerance errors and machine setting parameters errors strictly when generating DCAPSBG tooth.The thesis is supported by scientific and technological projects of the Education Department of Shanxi Province (No. 200811006).
|
PDF Full Text Request