Definition of gear modulus
The modulus is the factor that determines the tooth size. The gear module (gear module) is defined as a basic parameter of a modular gear tooth, which is an artificially abstracted number used to measure the scale of the gear tooth. The purpose is to standardize gear cutters and reduce costs. For the modules of straight teeth, helical teeth and bevel gears, please refer to the standard module series table.
With the continuous improvement of industrial development level, many customized mass-produced gears use non-standard modules, which weakens their significance.
If the number of teeth of the gear is constant, the larger the modulus, the larger the radial size of the wheel. Modulus series standards are formulated according to the requirements of design, manufacture and inspection.
For gears with non-straight teeth, the modulus has the difference of normal modulus mn, end face modulus ms and axial modulus mx, and they are based on their respective pitches (normal pitch, end face pitch and axial modulus Tooth pitch) to the ratio of pi, also in millimeters.
For bevel gears, the modulus is divided into big end modulus me, average modulus mm and small end modulus m1.
For tools, there are corresponding tool modulus and so on.
The application of standard modulus is very wide. In metric gear transmission, worm drive, synchronous belt drive and ratchet, gear coupling, spline and other parts, the standard modulus is the most basic parameter. It plays the role of basic parameters for the design, manufacture and maintenance of the above-mentioned parts (see cylindrical gear transmission, worm drive, etc.).
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