Gear module is one of the essential parameters in gear design and manufacturing in the field of mechanical engineering. It not only affects the geometric shape and size of the gear but also directly influences the transmission performance, strength, and overall operational stability of the mechanical system. Before delving into the understanding of gear module, it’s necessary to grasp the basic concepts of gears and the principles of gear transmission.
For those who have come into contact with gears, we often mention the concept of gear module! But do you know what this module is?
Gear module is a parameter used to describe the size and geometric shape of gears, and it’s an important parameter in the model of gears. The gear module is usually represented by the letter “M” and signifies the ratio of the number of teeth on the gear to its diameter. Specifically, the module refers to the ratio of the number of teeth on the gear (i.e., the quantity of teeth on each gear) to the gear diameter.
The formula for calculating gear module is as follows:
M = D / N
Where: M represents the module; D represents the diameter of the gear; N represents the number of teeth on the gear.
So how do we choose the module?
In fact, the module multiplied by pi equals the pitch, and the pitch is the distance between adjacent teeth. Therefore, increasing the module will increase the thickness of a single tooth and the strength of the gear. However, it’s not that a larger module is always better. For example, in gears with limited space, a larger module means fewer teeth in mesh, which is not conducive to transmission. On the contrary, under conditions where strength and structure permit, a smaller module should be chosen (as shown in the figure below). But how do you choose the module?
Generally, the module is initially selected based on the center distance, and after determining the module range, the next step is to select from the standard module series.
Here, I have collected the first and second series of standard modules as well as the small module series, with values in parentheses indicating modules that are not recommended for use. Usually, the module cannot be just any decimal; it should be selected based on the above standard module series. After determining the module, the next step is to select the number of teeth.
Standard Modulus First Series： 1、1.25、1.5、2、2.5、3、4、5、6、8、10、12、16、20、25、32、40、50
Standard module second series： 1.125、1.375、1.75、2.25、2.75、3.5、4.5、5.5、（6.5）、7、9、11、14、18、22、28、36、45
Modulus less than 1: (GB/T1357-2008 has been cancelled)： 0.1、0.12、0.15、0.2、0.25、0.3、0.35
The module is a critical parameter in gear design, affecting the gear ratio, size, and strength of the gear. Typically, as the gear module increases, the number of teeth on the gear decreases, and the gear diameter increases, and vice versa. When designing gear transmission systems, it’s necessary to choose the appropriate gear module according to specific engineering requirements and conditions.
Thank you for reading. Looking forward to serving you with our exceptional gear solutions. #BeyondGears
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