Sprockets is often classified into normal sprockets, HK sprockets and other sprockets.
one. Conventional sprocket
Conventional sprockets are ANSI sprockets which can be engaged with typical series roller chains. See P125 for dimensions.
You can find two forms of tooth profiles: U-tooth and S-tooth.
2. HK sprocket
HK sprockets is usually engaged with HK series roller chains, and individuals for single strand chains are identical to conventional sprockets. Having said that, sprockets for multiple strand chains are distinctive from normal sprockets in sprocket tooth profile.
three. Other sprockets
Other sprockets are created according to the following calculation formulas to suit respective specialty chains.
The sprockets made use of for your following chains are the similar as the normal sprockets in tooth gap form, but different in tooth thickness (sprocket tooth profile).
four. Calculation of sprocket dimensions
The dimensions of common sprockets and other common sprockets are calculated as follows. To start with, the diameters of sprockets are calculated from the following calculation formulas.
Following, sprocket tooth profile (the form with the tooth determined by its thickness) is calculated in the following calculation formulas. (The values shown in the following pages have been calculated by these formulas and regarded as the regular values.)
Calculation formulas for diameters and tooth gap kinds Calculation formulas for diameters
Calculation of pitch diameter, tip diameter and caliper diameter
The basic dimensions of the sprocket appropriate to get a chain pitch of one mm are respectively termed pitch diameter factor, tip diameter element and caliper diameter element. The respective components for respective numbers of teeth are listed under. If these things are multiplied by chain pitch, the fundamental dimensions with the corresponding sprocket can be obtained.
Instance:
From the situation of 80 (25.forty mm pitch) with 35 teeth Pitch diameter (Dp) ＝ P×Pitch diameter factor
Calculation formulas for tooth gap types
As the most rational tooth gap types by which the pressure angle improvements in response to the elongation of the smoothly rotated roller chain together with the lapse of support time, ANSI specify two kinds of tooth profiles: U-type and S-type. Generally, S-type tooth profiles are adopted in accordance with ANSI, and our normal 
sprockets also have S-tooth profiles.
