Sprockets could be classified into common sprockets, HK sprockets and other sprockets.
one. Common sprocket
Common sprockets are ANSI sprockets which can be engaged with regular series roller chains. See P125 for dimensions.
You will discover two styles of tooth profiles: U-tooth and S-tooth.
two. HK sprocket
HK sprockets may be engaged with HK series roller chains, and those for single strand chains are identical to regular sprockets. However, sprockets for numerous strand chains are distinctive from standard sprockets in sprocket tooth profile.
3. Other sprockets
Other sprockets are made according to the following calculation formulas to suit respective specialty chains.
The sprockets employed for the following chains are the same because the standard sprockets in tooth gap kind, but diverse in tooth thickness (sprocket tooth profile).
4. Calculation of sprocket dimensions
The dimensions of standard sprockets along with other common sprockets are calculated as follows. At first, the diameters of sprockets are calculated in the following calculation formulas.
Up coming, sprocket tooth profile (the shape from the tooth based upon its thickness) is calculated through the following calculation formulas. (The values proven from the following pages have been calculated by these formulas and regarded as the conventional values.)
Calculation formulas for diameters and tooth gap types Calculation formulas for diameters
Calculation of pitch diameter, tip diameter and caliper diameter
The essential dimensions of a sprocket appropriate for a chain pitch of 1 mm are respectively called pitch diameter element, tip diameter aspect and caliper diameter component. The respective variables for respective numbers of teeth are listed under. If these components are multiplied by chain pitch, the essential dimensions of your corresponding sprocket may be obtained.
Example:
From the situation of 80 (25.forty mm pitch) with 35 teeth Pitch diameter (Dp) = P×Pitch diameter aspect
Calculation formulas for tooth gap forms
Because the most rational tooth gap varieties during which the stress angle changes in response to the elongation of the smoothly rotated roller chain with all the lapse of services 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 common sprockets also have S-tooth profiles.