What Are the Correct Meshing Conditions for a Pair of Gears?

[DiJesse]

The conditions for correct meshing of gears are equal modulus, equal pressure angle, and equal base circle tooth pitch. The following are the specific conditions for correct meshing of gears: Equal modulus and equal pressure angle: The modulus of the two gears must be equal, and the tooth profile angle on the pitch circle of the two gears must be equal. The meshing conditions of helical cylindrical gears are that the cross-sectional modulus of the two gears is equal, the tooth profile angle is equal, the helix angle is equal, and the helix direction is opposite. The meshing conditions of straight bevel gears are that the large end modulus and tooth profile angle of the two gears are equal respectively. Equal base circle tooth pitch: The base circle tooth pitch of a pair of gears must be equal. Because the processing tools for involute gears are standardized, the meshing condition of gears is that the pressure angle on the pitch circle of the two gears is equal, the modulus of the two gears is equal, and equal to the national standard value, etc. The continuous meshing condition of gears is that the contact ratio must be greater than 1.