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Knowledge of modulus of gear in gear reducer motor
Nov 08, 2018

Gear reducer motor plays an important role in the operation of plant equipment, because for this equipment, one of its key knowledge points is the gear module in gear reducer, which is still vague for some factory operators, especially for some novices. We will focus on this knowledge for everyone to collate and analyze.


The concept of gear modulus:

Modulus is the factor determining the size of the tooth. Gear modulus is defined as a basic parameter of modular gear system. It is a number abstracted artificially to measure the size of gear teeth. The aim is to standardize gear cutting tools to reduce costs. The modulus of straight teeth, helical teeth and conical gears can be referenced by standard modulus series tables.

With the continuous improvement of industrial development level, many custom mass production gears use non-standard modulus, which weakens its significance.

If the number of teeth of the gear is constant, the larger the modulus is, the larger the radial dimension of the wheel is. The modular series standards are formulated according to the requirements of design, manufacture and inspection.


Computational Formula

Modulus M = standard pitch diameter D / teeth z = tooth number P /circumference ratio π


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National standard parameters:

Standard module series of China (GB/T 1357-1987)

First Series
0.1
0.12
0.15
0.2
0.25
0.3
0.4
0.5
0.6
0.8
1
1.25
1.5
2
2.5
3
4
5
6
8
10
12
16
20
25
32
40
50


Second Series
0.35
0.7
0.9
1.75
2.25
2.75
(3.25)
3.5
(3.75)
4.5
5.5
(6.5)
7
9
(11)
14
18
22
28
(30)
36
45

Note: When choosing modulus, the first series should be preferred, followed by the second series. The modulus in parentheses should not be used as far as possible.


The main problem of gear modulus in gear reducer is that if the higher the modulus gear teeth are, the thicker the modulus is. The modulus refers to the ratio of teeth pitch t to circumference ratio π (m=t/π) between the two adjacent teeth on the same side of the tooth profile in millimeters. Modulus is one of the most basic parameters of the modular gear. The larger the modulus. If the number of teeth is certain, the radial size of the wheel is also larger. For gears with non-straight teeth, modulus series standards are formulated according to the requirements of design, manufacture and inspection. Modulus has the difference between normal modulus Mn end face modulus MS and axial modulus Mx. Both of them are based on the ratio of their respective pitches (normal pitch, end face pitch and axial pitch) to the circumference ratio, and are also based on millimeters. In addition, we also need to know that for bevel gear module, there are big end modulus Me average modulus Mm and small end modulus M1. For cutting tools, there are corresponding tool modules Mo and so on, and the specification modulus is widely used.


The operation of gear reducer motor is highly efficient, because it has been in the process of efficient operation for a long time, so for operators, the structure of each part of the equipment and the knowledge points of each part must be understood, in order to avoid problems in the work and do not know how to deal with them.

*For more detailed parameters,size,price.Pls contact the Hangzhou Starred-River Machinery Co., Ltd.

Tel:+86-571-89988755

E-mail:802@china-sr.com

Website:http://www.srgearboxes.com

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