Design contact area and transmission error of hypoid gear tooth surface of drive axle

Under the actual working condition, due to the meshing dislocation of the drive axle hypoid gear under the load, the load meshing performance will change with the load. Therefore, it is necessary to carry out the load contact analysis (LTCA) to obtain the tooth surface meshing performance of the hypoid gear under the actual working condition. Before LTCA analysis, it is necessary to determine the contact area and transmission error in the tooth surface design stage.

The gear grinding parameters of large wheel and small wheel of hypoid gear are obtained by Gleason cage software according to the design requirements.

Large wheel model Small wheel model

The mathematical model of hypoid gear grinding is established. Through the discrete numerical solution of hypoid gear tooth surface, the three-dimensional models of small wheel and large wheel can be obtained, as shown in Figure 1. By establishing the tooth surface meshing mathematical model of hypoid gear, the TCA analysis equation is constructed, and the tooth grinding parameters of hypoid gear are simulated by TCA. The simulation results are shown in Fig. 2.

Tooth surface contact area
Transmission error

As can be seen from Fig. 2, the contact area of hypoid gear tooth surface is located at the small end in the middle of the tooth surface, which is in diagonal contact; The transmission error is in the shape of parabola with opening downward, the curves are symmetrical and cross each other, and the amplitude is – 38.4 μ rad; The tooth surface design of hypoid gear is more reasonable.

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