Sprockets is often classified into normal sprockets, HK sprockets and various sprockets.
one. Common sprocket
Normal sprockets are ANSI sprockets which could be engaged with common series roller chains. See P125 for dimensions.
You’ll find two forms of tooth profiles: U-tooth and S-tooth.
two. HK sprocket
HK sprockets might be engaged with HK series roller chains, and individuals for single strand chains are identical to regular sprockets. However, sprockets for a number of strand chains are distinctive from regular 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 utilized for that following chains would be the identical because the typical sprockets in tooth gap kind, but different in tooth thickness (sprocket tooth profile).
four. Calculation of sprocket dimensions
The dimensions of standard sprockets and other general sprockets are calculated as follows. Initially, the diameters of sprockets are calculated in the following calculation formulas.
Following, sprocket tooth profile (the shape of the tooth based on its thickness) is calculated in the following calculation formulas. (The values shown during the following pages were calculated by these formulas and thought to be 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 basic dimensions of the sprocket appropriate for any chain pitch of one mm are respectively identified as pitch diameter component, tip diameter element and caliper diameter element. The respective variables for respective numbers of teeth are listed below. If these aspects are multiplied by chain pitch, the fundamental dimensions with the corresponding sprocket is often obtained.
Illustration:
While in the case of 80 (25.40 mm pitch) with 35 teeth Pitch diameter (Dp) ＝ P×Pitch diameter aspect
Calculation formulas for tooth gap varieties
Because the most rational tooth gap kinds in which the stress angle alterations in response to your elongation of a smoothly rotated roller chain with all the lapse of support time, ANSI specify two varieties of tooth profiles: U-type and S-type. Generally, S-type tooth profiles are adopted in accordance with ANSI, and our conventional sprockets also have S-tooth profiles.