Dimensions of Sprocket

Sprockets could be classified into common sprockets, HK sprockets and other sprockets.
one. Typical sprocket
Common sprockets are ANSI sprockets which could be engaged with conventional series roller chains. See P125 for dimensions.
You’ll find two forms of tooth profiles: U-tooth and S-tooth.
2. HK sprocket
HK sprockets could be engaged with HK series roller chains, and these for single strand chains are identical to common sprockets. Even so, sprockets for various strand chains are various from regular sprockets in sprocket tooth profile.
3. Other sprockets
Other sprockets are intended in accordance to the following calculation formulas to suit respective specialty chains.
The sprockets employed for that following chains are the identical because the regular sprockets in tooth gap kind, but different in tooth thickness (sprocket tooth profile).
4. Calculation of sprocket dimensions
The dimensions of standard sprockets and other standard sprockets are calculated as follows. To start with, the diameters of sprockets are calculated through the following calculation formulas.
Up coming, sprocket tooth profile (the form on the tooth based upon its thickness) is calculated from the following calculation formulas. (The values shown during the following pages had been calculated by these formulas and thought to be the common values.)
Calculation formulas for diameters and tooth gap forms Calculation formulas for diameters
Calculation of pitch diameter, tip diameter and caliper diameter
The essential dimensions of the sprocket appropriate for any chain pitch of one mm are respectively known as pitch diameter element, tip diameter component and caliper diameter factor. The respective things for respective numbers of teeth are listed beneath. If these factors are multiplied by chain pitch, the fundamental dimensions on the corresponding sprocket can be obtained.
Illustration:
In the situation of 80 (25.forty mm pitch) with 35 teeth Pitch diameter (Dp) ＝ P×Pitch diameter aspect
Calculation formulas for tooth gap varieties
As the most rational tooth gap varieties by which the pressure angle alterations in response to the elongation of the smoothly rotated roller chain using the lapse of services time, ANSI specify two varieties of tooth profiles: U-type and S-type. Usually, S-type tooth profiles are adopted in accordance with ANSI, and our regular sprockets also have S-tooth profiles.