Sprockets is usually classified into standard sprockets, HK sprockets as well as other sprockets.
1. Common sprocket
Typical sprockets are ANSI sprockets which could be engaged with typical series roller chains. See P125 for dimensions.
There are actually two varieties of tooth profiles: U-tooth and S-tooth.
2. HK sprocket
HK sprockets might be engaged with HK series roller chains, and those for single strand chains are identical to normal sprockets. Nonetheless, sprockets for many strand chains are unique from conventional sprockets in sprocket tooth profile.
three. Other sprockets
Other sprockets are developed according towards the following calculation formulas to suit respective specialty chains.
The sprockets used to the following chains will be the same because the typical sprockets in tooth gap form, but distinctive in tooth thickness (sprocket tooth profile).
four. Calculation of sprocket dimensions
The dimensions of conventional sprockets along with other common sprockets are calculated as follows. At the outset, the diameters of sprockets are calculated from the following calculation formulas.
Subsequent, sprocket tooth profile (the form from the tooth determined by its thickness) is calculated in the following calculation formulas. (The values proven in the following pages had been calculated by these formulas and thought to be the typical 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 a sprocket ideal for a chain pitch of 1 mm are respectively called pitch diameter aspect, tip diameter issue and caliper diameter component. The respective factors for respective numbers of teeth are listed below. If these elements are multiplied by chain pitch, the essential dimensions with the corresponding sprocket may be obtained.
Example:
During the case of 80 (25.40 mm pitch) with 35 teeth Pitch diameter (Dp) = P×Pitch diameter element
Calculation formulas for tooth gap types
Since the most rational tooth gap varieties through which the strain angle improvements in response on the elongation of the smoothly rotated roller chain together with the lapse of service time, ANSI specify two forms of tooth profiles: U-type and S-type. On the whole, S-type tooth profiles are adopted in accordance with ANSI, and our standard sprockets also have S-tooth profiles.