Sprockets may be classified into typical sprockets, HK sprockets and various sprockets.
1. Common sprocket
Standard sprockets are ANSI sprockets which might be engaged with standard series roller chains. See P125 for dimensions.
You’ll find two styles of tooth profiles: U-tooth and S-tooth.
2. HK sprocket
HK sprockets might be engaged with HK series roller chains, and individuals for single strand chains are identical to conventional sprockets. Even so, sprockets for multiple strand chains are unique from conventional sprockets in sprocket tooth profile.
3. Other sprockets
Other sprockets are built according for the following calculation formulas to suit respective specialty chains.
The sprockets applied for that following chains will be the same because the normal sprockets in tooth gap form, but different in tooth thickness (sprocket tooth profile).
four. Calculation of sprocket dimensions
The dimensions of conventional sprockets as well as other common sprockets are calculated as follows. At first, the diameters of sprockets are calculated through the following calculation formulas.
Following, sprocket tooth profile (the form on the tooth determined by its thickness) is calculated in the following calculation formulas. (The values proven from the following pages were calculated by these formulas and thought to be the common 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 the sprocket appropriate for a chain pitch of one mm are respectively known as pitch diameter factor, tip diameter component and caliper diameter element. The respective things for respective numbers of teeth are listed under. If these variables are multiplied by chain pitch, the essential dimensions of the corresponding sprocket is often obtained.
Illustration:
While in the situation of 80 (25.40 mm pitch) with 35 teeth Pitch diameter (Dp) = P×Pitch diameter factor
Calculation formulas for tooth gap types
Since the most rational tooth gap types through which the stress angle alterations in response to your elongation of the smoothly rotated roller chain with all the lapse of services time, ANSI specify two sorts 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.