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RV reducer (Rotate Vector Reducer) is a high-precision, high-reduction ratio, and high-rigidity reducer. It is often used in the J1~J3 axis of the general six-axis robot arm. The J1~J3 axis needs to bear a large torque. The RV reducer, a key component in the joint, needs to have a greater rigidity requirement. This paper mainly focuses on the preload simulation analysis of the core parts of the reducer, the cooperation between the cycloidal wheel, the ring gear pins and the ring gear pins seat. By changing the diameter of the ring gear pins, it is observed that the cycloidal gear teeth are simulated under different preloads. The surface equivalent stress value and the contact situation between the cycloid wheel and the ring gear pins, so that the stress value is controlled within the acceptable range of the material fatigue strength. The internal clearance of the needle wheel and the cycloid wheel is controlled at a negative clearance, and the pre-compression fit is simulated, so that the pre-pressure during operation is controlled within a reasonable range as the goal. In this paper, a mathematical model of the cycloid wheel is established and programmed. By adjusting the parameters of the offset modification amount and the isometric modification amount in the mathematical model, the tooth profile of the cycloid wheel with different linear shapes is generated, and the tooth profile is imported into the drawing The software performs 3D modeling of the cycloid, ring gear pins,eccentric shaft and planetary support, and then imports the drawn model into HyperMesh for pre-processing operations such as finite element model meshing and material load setting, and uses LS-DYNA for finite element Analyze, export the calculation results to LS-PrePost for dynamic simulation, use LS-PrePost to observe the tooth surface stress distribution and export the equivalent stress of the tooth surface.
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