Sprockets is usually classified into typical sprockets, HK sprockets along with other sprockets.
1. Standard sprocket
Common sprockets are ANSI sprockets which can be engaged with regular series roller chains. See P125 for dimensions.
You’ll find 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 typical sprockets. Nevertheless, sprockets for many strand chains are unique from regular sprockets in sprocket tooth profile.
three. Other sprockets
Other sprockets are developed in accordance to the following calculation formulas to suit respective specialty chains.
The sprockets utilised for the following chains are the same because the normal sprockets in tooth gap kind, but various in tooth thickness (sprocket tooth profile).
four. Calculation of sprocket dimensions
The dimensions of common sprockets and also other standard sprockets are calculated as follows. At first, the diameters of sprockets are calculated in the following calculation formulas.
Upcoming, sprocket tooth profile (the form with the tooth based on its thickness) is calculated from the following calculation formulas. (The values proven from the following pages had been calculated by these formulas and thought to be the typical values.)
Calculation formulas for diameters and tooth gap varieties Calculation formulas for diameters
Calculation of pitch diameter, tip diameter and caliper diameter
The essential dimensions of a sprocket appropriate to get a chain pitch of one mm are respectively named pitch diameter factor, tip diameter aspect and caliper diameter aspect. The respective things for respective numbers of teeth are listed below. If these elements are multiplied by chain pitch, the fundamental dimensions on the corresponding sprocket might be obtained.
During the case of 80 (25.40 mm pitch) with 35 teeth Pitch diameter (Dp) = P×Pitch diameter issue
Calculation formulas for tooth gap types
Because the most rational tooth gap varieties by which the stress angle alterations in response on the elongation of a smoothly rotated roller chain with all the lapse of service time, ANSI specify two types of tooth profiles: U-type and S-type. On the whole, S-type tooth profiles are adopted in accordance with ANSI, and our typical sprockets also have S-tooth profiles.