What are gear modulus, pressure angle and index circle diameter?

1. What is the gear modulus?

The modulus represents the size of the gear teeth, which is the ratio of the pitch of the indexing circle to the circumference ratio (π), and the unit is millimeters (mm).DecidegearThe two major factors of size are modulus and number of teeth.

In addition to the modulus, CP (peripheral section) and DP (diameter section) also indicate the size of gear teeth.

The diameter pitch (DP) refers to the number of teeth occupied per inch according to the diameter of the gear index circle (calculated in inches).

Diameter pitch and modulus have this relationship: m=25.4/DP

CP1/8模=25.4/DP8=3.175 3.175/3.1416(π)=1.0106模

CP (peripheral pitch) is the circumferential tooth pitch on the index circle.The unit is the same as the modulus for millimeters.

CP divided by the pi (π) gives M (modulus).

The relationship between M (modulus) and CP is as follows:

M (modulus) = CP/π (circular ratio)

Both are units that indicate the size of gear teeth.

Divided circumference=πd=zp d=zp/π p/π is called modulus.

2. What is the gear pressure angle?

Generally speaking, the pressure angle refers to the pressure angle of the index circle, that is, the acute angle between the radial line of the intersection of the tooth profile and the index circle and the tangent line of the tooth profile at that point.

最为普遍地使用的压力角为20°，但是，也有使用14.5°、15°、17.5°、22.5°压力角的齿轮。

3. What is the gear index circle diameter?

The index circle diameter is the reference diameter of the gear, which is equal to the product of the number of teeth and the modulus (end face).

The above is the relevant description of the gear modulus, pressure angle and index circle diameter, for reference, more relevant content can be obtained from EP Gear processing Technology asks for help.