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Introduction and use of small module gears


"Modulus" refers to the ratio of the pitch t between two adjacent gear teeth on the same side tooth profile to the circumference ratio ¶– (m=t/¶–), in millimeters. Modulus is one of the most basic parameters of modular gear teeth. The greater the modulus, the higher and thicker the gear teeth. If the number of gear teeth is certain, the radial specification of the wheel is also greater. Modulus series specifications are drawn up according to the requirements of planning, production and inspection. Regarding gears with non-straight teeth, there are differences in modulus between normal modulus mn, end face modulus ms, and axial modulus mx. They are all based on their respective tooth pitches (normal pitch, end face pitch and axial The ratio of the pitch) to the circumference ratio is also in millimeters. Regarding bevel gears, the modulus is divided into large-end modulus me, uniform modulus mm and small-end modulus m1. Regarding the tool, there are corresponding tool modulus mo and so on. The specification modulus is widely used. In metric gear drives, worm drives, synchronous toothed belt drives and ratchets, gear couplings, splines and other parts, the norm modulus is the most basic parameter. It plays the role of basic parameters for the planning, production and maintenance of the above-mentioned parts (see cylindrical gear transmission, worm transmission, etc.).

Small modulus gears are gears whose modulus is less than or equal to 1mm. Small modulus gears are widely used in aviation machinery, electronic products, precision machinery, instrumentation and timing organizations. The basic principle of the processing method of small module gears is the same as that of large and medium module gears.

Standard spur gear calculation formula:

Addendum circle diameter = modulus * (number of teeth + 2)

Diameter of the index circle = modulus * number of teeth

Calculation method of helical gear:

Addendum circle diameter=(modulus*number of teeth)/cos¶¬+2*module

Classification of small module gear transmission:

According to the meshing principle of small module gears, it can be divided into:

Involute gear transmission, including involute gear transmission for timing instruments. Cycloidal gear transmission includes various modified cycloidal gear transmissions.

The planetary gear transmission consists of a sun gear, several planetary gears and a gear ring and then reaches the effect of increasing the torque.

Small modulus gears are generally used in precision equipment, such as miniature gearboxes, robots, cars, home electronics, cameras, printers, mobile phones, etc.