I need to achieve a bevel gear transmission with a shaft intersection angle ∑ of 90°, and it is required to have a high bearing capacity, frequent forward and reverse rotations, and a very compact structure size. Then, is it more appropriate to use spiral bevel gears? However, will reverse rotation cause changes in axial force? Can the use of straight bevel gears avoid this problem?
Straight bevel gears have the defect of too small a contact ratio coefficient, which will lead to a reduction in their bearing capacity and also generate relatively large noise. In contrast, choosing spiral bevel gears is more ideal! As mentioned above, a reasonable backlash needs to be designed because frequent forward and reverse rotations pose a huge challenge to the strength of the teeth, especially in terms of impact strength. If the structural conditions permit, hypoid gears are also a good choice.
It should be noted that forward and reverse rotations have an impact on axial force, not negligible as some opinions think! Where possible, cross-mounted installation can be chosen because cantilever installation has many drawbacks.
In conclusion, it mainly depends on the type of structure you choose and the specific situation of the space size. The situation here is very complex and specific analysis must be carried out for specific problems.