Sprockets is often classified into standard sprockets, HK sprockets and various sprockets.
one. Regular sprocket
Regular sprockets are ANSI sprockets which might be engaged with regular series roller chains. See P125 for dimensions.
You’ll find two sorts of tooth profiles: U-tooth and S-tooth.
two. HK sprocket
HK sprockets may be engaged with HK series roller chains, and these for single strand chains are identical to regular sprockets. Having said that, sprockets for several strand chains are distinctive from conventional 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 to the following chains are the identical because the typical sprockets in tooth gap type, but different in tooth thickness (sprocket tooth profile).
4. Calculation of sprocket dimensions
The dimensions of conventional sprockets together with other basic sprockets are calculated as follows. At the outset, the diameters of sprockets are calculated in the following calculation formulas.
Up coming, sprocket tooth profile (the form with the tooth based upon its thickness) is calculated in the following calculation formulas. (The values shown during the following pages have been calculated by these formulas and thought to be the conventional values.)
Calculation formulas for diameters and tooth gap varieties 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 aspect and caliper diameter aspect. The respective variables for respective numbers of teeth are listed below. If these aspects are multiplied by chain pitch, the fundamental dimensions on 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 the smoothly rotated roller chain with all the lapse of support time, ANSI specify two kinds of tooth profiles: U-type and S-type. Generally, S-type tooth profiles are adopted in accordance with ANSI, and our typical sprockets also have S-tooth profiles.