| Now the engines have the characteristics of high heat efficiency, heavy power and high torque, so the engineers always concentrate on their structure strength in the design and production, including the engine gear driving system. The tradition computation formulation of the structure stress and the strength check is not enough precise, because not reflect every position's stress of the structure. In opposite, using the modern FEM, the engineers can acquire the highly precise stress distribution expediently and rapidly. In this paper, CAD/CAE software-based, studies and analyzes the heavy power engine's gear. This paper includes the following contents:1,Using different parameter formulation, establishes accurate 3D parameterization model of involutes gear, spur gear. This 3D parameterization model can be generated spur gear, left helical gears or right helical gears by the parameter change. Considering actual gear processing, establishes fillet curve. According to gears' plane of action, carries out non-interference assembly, and acquire optional gear engagement state.2,Using FEM, calculate the gear's steady bend and contact stress. Much previous processing the 3D model, using ISOMESH method, generate efficient hexahedron element. In the calculation of the steady bend stress, consider actual action contact line. In the calculation of the steady contact stress, analyzes the special gears' action state and exerts torque using MPC method. At last, researches the reasonable of the stress result, and according to the result, acquires a lot of conclusion.3,Calculates the changing stress under the gears low-speed running. According to the feature of MSC.Marc software, the rigid body controls the deformation body, exerting low speed for the driving gear, exerting resistance force moment for the driven gear. Thus the software may simulate stress change in the gears low-speed running. At last, researches the friction affection on the contact stress, detailed analyzes the stress change of one tooth action period.4,Using MSC.Fatigue software, analyzes the gear's bend fatigue life. The software iterates the steady bend stress of the tooth root. In the paper, acquires the fatigue life of the tooth root, and according to the fatigue analysis result, makes the optimal design and load's sensitivity analysis.In the process of the engine reliability design, the engineers may acquire the basic data. After completing this paper, may improve the design quality, reduce the product cost. In one word, the paper has high actual engineering meaning. |
