Sprockets is usually classified into normal sprockets, HK sprockets and also other sprockets.
one. Regular sprocket
Typical sprockets are ANSI sprockets which may be engaged with typical series roller chains. See P125 for dimensions.
There are two sorts of tooth profiles: U-tooth and S-tooth.
2. HK sprocket
HK sprockets may be engaged with HK series roller chains, and those for single strand chains are identical to common sprockets. Nevertheless, sprockets for a number of strand chains are distinct from common sprockets in sprocket tooth profile.
three. Other sprockets
Other sprockets are made in accordance to the following calculation formulas to suit respective specialty chains.
The sprockets employed to the following chains would be the very same as the standard sprockets in tooth gap kind, but unique in tooth thickness (sprocket tooth profile).
4. Calculation of sprocket dimensions
The dimensions of normal sprockets and various general sprockets are calculated as follows. At the outset, the diameters of sprockets are calculated in the following calculation formulas.
Subsequent, sprocket tooth profile (the shape from the tooth according to its thickness) is calculated from the following calculation formulas. (The values shown inside 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 a sprocket suitable for any chain pitch of 1 mm are respectively termed pitch diameter component, tip diameter element and caliper diameter aspect. The respective variables for respective numbers of teeth are listed beneath. If these elements are multiplied by chain pitch, the fundamental dimensions with the corresponding sprocket could be obtained.
Instance:
In the case of 80 (25.forty mm pitch) with 35 teeth Pitch diameter (Dp) ＝ P×Pitch diameter component
Calculation formulas for tooth gap forms
Because the most rational tooth gap forms 
during which the pressure angle adjustments in response on the elongation of a smoothly rotated roller chain using the lapse of service time, ANSI specify two varieties of tooth profiles: U-type and S-type. Normally, S-type tooth profiles are adopted in accordance with ANSI, and our conventional sprockets also have S-tooth profiles.
