Elaborate Analysis Of Transmission Strength About Spiral Bevel Gear Drive

Spiral bevel gear transmission is used most extensively in the industry of aviation, sailing, car, tractor, and machine tool as the base transmission part; it is used to transmit of the motion and power of concurrent axes. It has the character of stable transmission, low noise and large range power. The inactivation of the spiral bevel gear causes heavy accident, because it is used in high-speed and heavy-duty drive occasion. It is necessary to do some research of the tooth contact analysis to improve the drive reliability and quality. With the development of computer technology, the Finite Element Method (FEM) is used widely in the analysis of gear transmission intensity. The reason for it is that FEM can deal with mechanical boundary condition and the mechanics of the loaded tooth contact surface very well, and therefore it can provide an exact stress and deformation analysis for gear transmission system.The traditional methods to analysis the transmission strength about the spiral bevel gear is translate it into equivalence column gear, calculate the contact stress and bending stress according to the gear inaction form, so the results error is big. The FEM method to plot the three-dimensional model mostly was from the manufacturing procedure to create the mathematical mode, consequently obtain the data of the contact tooth. Because this method require lots of contact rationale knowledge and data manipulation, it is not easy to master by engineers and technicians.Applying the powerful entity shape function of Pro/E software, by input the parameter of the number of tooth, module, pressure angle, pitch angle and the modification coefficient to plot the three-dimensional model and assembled; and then use the interface programs to import the assemble model to the pre-process and post-process software MSC. Patran. According to symmetrical characteristic of gear and the characteristic of the FEM analysis, choose three teeth which was in contact partly, use eight node hex element to mesh it by manual labor, and generate the MSC. Marc program document; input the document, and then define the boundary condition, material property and contact body in MSC. Marc, therefore complete the FEM process from the geometrical model, net mesh and the boundary condition, then perform the static contact analysis by define the tangential force on the rotate surface, compare the results with theory calculation data, verify the FEM model; and then define control rigid body, perform dynamic contact analysis by define velocity and moment with the rigid body based on the static contact FEM model, obtain the state of the stress distribution. Supply an effective check means for the engineering practice.