Sprockets may be classified into common sprockets, HK sprockets and also other sprockets.
1. Typical sprocket
Standard sprockets are ANSI sprockets which could be engaged with conventional series roller chains. See P125 for dimensions.
You’ll find two styles of tooth profiles: U-tooth and S-tooth.
2. HK sprocket
HK sprockets can be engaged with HK series roller chains, and these for single strand chains are identical to regular sprockets. On the other hand, sprockets for multiple strand chains are diverse from normal sprockets in sprocket tooth profile.
3. Other sprockets
Other sprockets are made in accordance towards the following calculation formulas to suit respective specialty chains.
The sprockets utilised for your following chains would be the same since the common sprockets in tooth gap type, but various in tooth thickness (sprocket tooth profile).
four. Calculation of sprocket dimensions
The dimensions of typical sprockets together with other basic sprockets are calculated as follows. Initially, the diameters of sprockets are calculated in the following calculation formulas.
Up coming, sprocket tooth profile (the shape in the tooth based upon its thickness) is calculated from the following calculation formulas. (The values shown from the following pages were calculated by these formulas and regarded as the regular 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 ideal for a chain pitch of one mm are respectively named pitch diameter aspect, tip diameter aspect and caliper diameter issue. The respective elements for respective numbers of teeth are listed beneath. If these variables are multiplied by chain pitch, the fundamental dimensions from the corresponding sprocket could be obtained.
Illustration:
During the case of 80 (25.forty mm pitch) with 35 teeth Pitch diameter (Dp) ＝ P×Pitch diameter component
Calculation formulas for tooth gap types
Since the most rational tooth gap types through which 
the pressure angle alterations in response towards the elongation of a smoothly rotated roller chain using the lapse of support time, ANSI specify two kinds of tooth profiles: U-type and S-type. On the whole, S-type tooth profiles are adopted in accordance with ANSI, and our normal sprockets also have S-tooth profiles.
