Papers by Keyword: Transmission Gear

Abstract: Based on the MASTA cylindrical gear manufacturing module, the hobbing process and heat treatment of automotive transmission gear were simulated. The simulation results show that the hobbing process has a lot of excellent process characteristics, such as good adaptability, continuous cutting, no extra stroke, higher productivity. By the MASTA software simulation the maximum value of the gear heat treatment deformation is about 70 um. The trend of thermal deformation first increases, then decreases, and then increases.

Abstract: Based on the theory of gear dynamics and contact, the paper uses multi-rigid-body dynamics software ADAMS to build transmission simulation model. The model takes the highest shift gears of a transmission as objects to finish gear meshing simulation analysis. The corresponding meshing force and its Fourier transform results are acquired based on the analysis to get the transmission gears meshing properties.

Abstract: A combination method of virtual simulation techniques was proposed for fatigue life of vertical shiplifts big modulus gear. A Three-dimensional assembly model of rack and pinion mechanism was established by SolidWorks and its plug GearTrax, then dynamics simulation was conducted based on ADAMS, the relative error between simulation results and static load was 2.2%, indicating the accuracy of the simulation. Bending stress of the big modulus gear was analysed by ANSYS, the error was 1.6% compared with the theoretical value. Using the obtained load history data and bending stress results, the big modulus gears fatigue life was predicted based on nominal stress method, the result showed that the big modulus gear could well meet the design requirements.

Abstract: On the basis of the analysis of special demand of helical gear of automotive transmission, gear precision modeling and finite element analysis of bending stress were carried out in this paper. In UG three-dimensional modeling environment, helical gear model was generated and imported into ANSYS software. Then the meshing on the geometric model and influence on gear strength with different radius of root fillet were discussed. The paper provided certain methods to guide the gear parametric design, strength analysis and improve optimization design efficiency of transmission gear parts.

Abstract: On the basis of the analysis of special demand of helical gear of automotive transmission, gear precision modeling and finite element analysis of flexural strength were carried out in this paper. In UG three-dimensional modeling environment, helical gear model was generated and imported into ANSYS software through data exchange interface. Then meshed on the geometric model, discussed the tooth contact area and the detrimental loading position, and compared the influence on gear strength with different tooth root fillet radius. The paper provided certain methods to guide the gear parametric design, strength analysis and improving optimization design efficiency of transmission gear parts.

Abstract: A method for transmission gearbox fault diagnosis is put forward in this paper by using radial basis function neural network (RBF network). A RBF neural network is created to simulate the gearbox fault diagnosis using Matlab neural network toolbox. Compared with BP neural network, RBF network is superior to the former in accuracy and speed according to the simulate results. This method is accurate and credible in gear fault diagnosis, and it has a broad application prospect in mechanical fault diagnosis.

Abstract: The model of thermoelastohydrodynamic (TEHL) analysis of a transmission gear in a fuel cell bus was developed. The influence of rotating speed on the frictional pair was investigated numerically on the base of the mathematical model. The pressure field, the temperature field, the oil film thickness were calculated under different rotating speeds. It is shown that the worst lubrication in the tooth root occurs and the minimum film thickness increases with growth of the rotating speed. The temperature of lubricant is up to 140oC at 4000rpm.

Abstract: A motorcycle transmission gear of chromium-molybdenum steel with 0.2%C was carburized in carrier gas. Carburizing process including heating, carburizing, diffusing and quenching was simulated using elastoplastic finite element method. The carbon content, hardness, residual strain and residual stress fields of gear were analyzed. The unstressed lattice plane spacing and residual strains of the interior near the internal spline of gear were experimentally measured by synchrotron x-ray and neutron diffraction methods. As a result, the analyzed carbon content and hardness gradients of gear accorded with the experimental results. The radial, hoop and axial directions of cylindrical gear were found to be not always principal axes of residual stress field. On the other hand, the analyzed residual strains in the radial, hoop and axial directions of gear slightly discorded with the experimental results. Although correlation between the measured three strains was similar to that of the weighted average of analyzed strains, residual strain and stress fields of motorcycle transmission gear could not be accurately predicted at the present finite element analysis. It was concluded that carbon diffusion phenomenon and resultant hardening could be analyzed by the finite element method, and the actual interior residual strain and stress fields should be nondestructively measured by neutron diffraction method.