A particularly want to do not understand, the two meshing gears, same modulus, tooth number is different, so different pitch diameter, base diameter is different, it is how to keep the wheel gear module two the same, because the base circle is different, it is certainly not a kind of involute, how can let the two teeth exactly the same, doubt. Even though the modulus is the same, the two teeth are not exactly the same. thank you very much indeed
The modulus is determined according to the different conditions, and each pair of gears must be of the same modulus. The role of two different gears reaching the two gears is exactly the same. Addendum circle and root circle position by displacement coefficient change, and the influence of involute and the base circle, and the center distance.
We should make clear the nature of involute, especially the character of gear meshing line. Two gear meshing line of base circle in common is the gear meshing point trajectory, the same side (involute tooth profile) meshing line section is the length of the base pitch, this is the correct gear engagement principle, equal base circle pitch.
Make sure that the correct meshing condition of the gear is a pair of gears, which must be of equal pitch. That is, a gear rolling over a base pitch, another gear must also roll over a base pitch; because the gear processing has been standardized, and the dividing circle parameters and corresponding calculation parameters of base circle, so the actual "has reflected the" two gear modulus, pressure must be angle must be equal to the correct meshing.
First of all, to clear the two basic concepts, basic circle is the "basic gear circle", is decided involute (shape) root circle; pitch circle of gear design is "reference circle", the gear parameters, calculation, generally by dividing circle as a benchmark, for example, modulus, pressure angle, tooth pitch, tooth thickness, etc., if no special instructions, generally refers to the reference circle (parameters).
