# Shape of contact area of spiral bevel gear

Taking the spiral bevel gear pair with 47 big teeth and 33 small teeth as an example, when the meshing point transitions from the root of the big wheel to the top of the big tooth, the shape of the contact area at different times is as follows. Fig. 1 is the shape of the contact area at different times when the transmission torque of the gear pair is 400nm, Fig. 2 is the shape of the contact area at different times when the transmission torque of the gear pair is 600nm, and Fig. 3 is the shape of the contact area at different times when the transmission torque of the gear pair is 800nm.

Taking the spiral bevel gear pair with 39 large teeth and 13 small teeth as an example, when the meshing point transitions from the root of the large wheel to the top of the large tooth, the shape of the contact area at different times is as follows. Fig. 4 is the shape of the contact area at different times when the transmission torque of the gear pair is 400nm, Fig. 5 is the shape of the contact area at different times when the transmission torque of the gear pair is 600nm, and Fig. 6 is the shape of the contact area at different times when the transmission torque of the gear pair is 800nm.

According to the shape of the contact area at different times, when the meshing point transitions from the root of the big wheel to the top of the big wheel, the center of the contact area gradually shifts from the small end to the large end. At the same time, it can be seen from the above two examples that when the torque transmitted by the spiral bevel gear pair changes from small to large, the center of the contact area also shifts to the large end for the same meshing position.

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