What is the gear modulus and how to calculate it?

For those who are new to gear transmission equipment, what is the gear modulus, how to calculate it, and what is the calculation formula, etc.?It may not be very clear.In order to allow you to better select products, EP Processing has shared the following content with you for reference.

XNUMX. Gear module description:

Modulus is a number artificially abstracted to measure the scale of gear teeth. It is a factor that determines the size of the teeth and is one of the most basic parameters for making gear teeth.Modulus and index circle, pressure angle, number of teeth, tooth pitch, etc.gearSeveral important parameters of the product.

1. Modulus series standards are formulated according to the requirements of design, manufacturing and inspection.The modules of spur, helical and bevel gears can all refer to the standard module series table.

2. Many customized mass production gears use non-standard modules.

3. For gears with non-straight teeth, the modulus has the difference between normal modulus mn, end face modulus ms and axial modulus mx. They are all based on their respective tooth pitch (normal tooth pitch, end face pitch and The ratio of the axial tooth pitch) to the circumference ratio is also in millimeters.

4. For bevel gears, the modules are divided into large-end module me, average module mm and small-end module m1.

XNUMX. How to calculate the gear modulus?What is the formula?

1. Calculation formula of helical gear modulus:

a. Calculation of dividing circle diameter Do=(number of teeth Z*modulus m)/trigonometric function cosB

b. Diameter calculation Dk=((number of teeth Z*modulus m)/trigonometric function cosB)+(modulus m*2)

c. Calculation of the circumference of a gear revolution Z = the diameter of the indexing circle Do * the circumference ratio π

Note: The algorithm of the installation center distance from the gear center point to the bottom surface of the rack: installation center distance Hb=(index circle diameter Do/2) + occlusal center line Ho.

2,Spur gearModulus calculation formula:

a. Index circle diameter technology Do=number of teeth Z*modulus m

b. Diameter calculation Dk=(number of teeth Z*modulus m)+(modulus m*2)

c. Calculation of the circumference of a gear revolution Z = the diameter of the indexing circle Do * the circumference ratio π

Note: The algorithm of the installation center distance from the gear center point to the bottom surface of the rack: installation center distance Hb=(index circle diameter Do/2) + occlusal center line Ho.

If the number of teeth of the gear is constant, the larger the modulus, the larger the radial dimension of the wheel; the larger the modulus, the higher and thicker the gear teeth; if the modulus is constant, the greater the number of teeth, the smoother the involute will be , The tooth thickness of the addendum and the thickness of the tooth root are correspondingly thicker; in the case of constant number of teeth, the larger the modulus, the larger the gear teeth and the stronger the ability to resist breaking. Of course, the larger the gear wheel blank, The larger the space size.

Therefore, when selecting gear products, comprehensive consideration of various parameters is required, and a suitable model and specification product is selected according to the actual application requirements. EP precision gear processing can be made from 0.3 to 15 molds, with a complete range of models and specifications. If you are unclear or related to requirements, you can click the consultation window on the right to consult for free.