What are the basic parameters of gears?

1, pitch circle diameter d', graduation circle diameter d-two tangent circles on the connecting line O 1O2 are called pitch circles. For a single gear, as the reference circle for calculating the dimensions of each part when designing and manufacturing gears, it is also a toothed circle, which is called a secant circle. Standard gear d = d'.

2. The diameter of the tooth top circle da-the circle passing through the tooth top of the gear is called the tooth top circle.

3. Tooth root circle diameter df-the circle passing through the root of the tooth slot is called the tooth root circle.

4. Tooth crest height ha Tooth root height hf Tooth height H- The radial distance between the tooth crest circle and the indexing circle is called tooth crest height; The radial distance between the cyclotron and the root circle is called the root height; The radial distance between the tooth top circle and the tooth root circle is called tooth height. Its size relationship is: h=ha+hf.

Extended data:

The most basic types of cylindrical gears are cylindrical spur gear mechanism and cylindrical helical gear mechanism, which transmit motion between parallel shafts.

According to the different tooth profile curves of gears, they can be divided into involute gears, cycloidal gears and circular-arc gears, among which involute gears are the most widely used.

The center distance, angular velocity ratio and relative steering of the two wheels can be adjusted by changing the spiral angle A and the gut line. This makes the gear mechanism more flexible in transmission geometry and easy to meet the requirements of motion transmission between arbitrary staggered shafts.

Baidu encyclopedia-cylindrical gear