Sprockets may be classified into standard sprockets, HK sprockets and also other sprockets.
one. Regular sprocket
Normal sprockets are ANSI sprockets which could be engaged with conventional series roller chains. See P125 for dimensions.
You will discover two varieties of tooth profiles: U-tooth and S-tooth.
2. HK sprocket
HK sprockets may be engaged with HK series roller chains, and these for single strand chains are identical to normal sprockets. However, sprockets for numerous strand chains are distinct from common sprockets in sprocket tooth profile.
3. Other sprockets
Other sprockets are designed according towards the following calculation formulas to suit respective specialty chains.
The sprockets utilized for the following chains would be the exact same since the typical sprockets in tooth gap type, but various in tooth thickness (sprocket tooth profile).
four. Calculation of sprocket dimensions
The dimensions of normal sprockets as well as other common sprockets are calculated as follows. To start with, the diameters of sprockets are calculated in the following calculation formulas.
Subsequent, sprocket tooth profile (the shape of the tooth dependant upon its thickness) is calculated through the following calculation formulas. (The values shown while in the following pages have been calculated by 
these formulas and thought to be the standard values.)
Calculation formulas for diameters and tooth gap types Calculation formulas for diameters
Calculation of pitch diameter, tip diameter and caliper diameter
The fundamental dimensions of a sprocket suitable for a chain pitch of one mm are respectively referred to as pitch diameter component, tip diameter issue and caliper diameter component. The respective things for respective numbers of teeth are listed under. If these factors are multiplied by chain pitch, the fundamental dimensions in the corresponding sprocket is usually obtained.
Illustration:
In the situation of 80 (25.40 mm pitch) with 35 teeth Pitch diameter (Dp) ＝ P×Pitch diameter issue
Calculation formulas for tooth gap forms
Because the most rational tooth gap varieties in which the pressure angle changes in response on the elongation of the smoothly rotated roller chain with all the lapse of services time, ANSI specify two forms of tooth profiles: U-type and S-type. Generally, S-type tooth profiles are adopted in accordance with ANSI, and our regular sprockets also have S-tooth profiles.
