Gear center distance problem for help! ! !

The standard center distance is equal to the sum of the teeth number of a pair of meshing gears multiplied by the modulus and then divided by 2, that is, (z1+z2) m/2;

When a pair of gears are engaged, the modulus and pressure angle must be equal;

When two pairs of gears are engaged, the modulus of the two pairs of gears may not be equal; Because the number of teeth must be an integer, the standard center distance of gears with the same center distance may not be equal.

When the standard center distances of two pairs (multiple pairs) of gears are not equal, but very close, the actual center distances can be made equal by gear displacement.

In the gear accuracy standard GB 10095-88, there is a "standard regulation" of the center distance limit deviation.