Sprockets can be classified into normal sprockets, HK sprockets and other sprockets.
1. Normal sprocket
Common sprockets are ANSI sprockets which could be engaged with regular series roller chains. See P125 for dimensions.
There are two forms of tooth profiles: U-tooth and S-tooth.
2. HK sprocket
HK sprockets is often engaged with HK series roller chains, and individuals for single strand chains are identical to regular sprockets. Having said that, sprockets for numerous strand chains are distinctive from standard sprockets in sprocket tooth profile.
3. Other sprockets
Other sprockets are designed according to the following calculation formulas to suit respective specialty chains.
The sprockets employed for your following chains will be the exact same since the common sprockets in tooth gap type, but unique in tooth thickness (sprocket tooth profile).
4. Calculation of sprocket dimensions
The dimensions of normal sprockets together with other basic sprockets are calculated as follows. To start with, the diameters of sprockets are calculated from the following calculation formulas.
Next, sprocket tooth profile (the form on the tooth based on its thickness) is calculated from your following calculation formulas. (The values proven during the following pages have been calculated by these formulas and regarded as the common values.)
Calculation formulas for diameters and tooth gap kinds Calculation formulas for diameters
Calculation of pitch diameter, tip diameter and caliper diameter
The fundamental dimensions of the sprocket suitable for a chain pitch of 1 mm are respectively termed pitch diameter factor, tip diameter factor and caliper diameter element. The respective aspects for respective numbers of teeth are listed beneath. If these aspects are multiplied by chain pitch, the essential dimensions of the corresponding sprocket can be obtained.
Illustration:
Inside the case of 80 (25.forty mm pitch) with 35 teeth Pitch diameter (Dp) ＝ P×Pitch diameter aspect
Calculation formulas for tooth gap types
Since the most rational tooth gap kinds by which the stress angle changes in response to the elongation of the smoothly rotated roller chain with all the lapse of support 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 common sprockets also have S-tooth profiles.