Correct option is D
The module (m) of a gear is defined as the ratio of the pitch circle diameter (D) to the number of teeth (T). It is a fundamental parameter in gear design that determines the size and spacing of teeth. The module is expressed in millimeters (mm).
m = D/T
Where:
· m = Module (mm)
· D = Pitch Circle Diameter (mm)
· T = Number of Teeth
The module is crucial because it ensures proper meshing of gears. Gears with the same module can engage correctly, regardless of the number of teeth.
The circular pitch (p) is related to the module by the formula: p = πm
In the imperial system, "diametral pitch (DP)" is used instead of the module, where: DP = T/D The module is the metric equivalent of diametral pitch.
