Sprockets may be classified into common sprockets, HK sprockets along with other sprockets.
one. Normal sprocket
Conventional sprockets are ANSI sprockets which might be engaged with typical series roller chains. See P125 for dimensions.
There are actually two forms of tooth profiles: U-tooth and S-tooth.
2. HK sprocket
HK sprockets could be engaged with HK series roller chains, and individuals for single strand chains are identical to typical sprockets. On the other hand, sprockets for various strand chains are distinct from normal sprockets in sprocket tooth profile.
three. Other sprockets
Other sprockets are built in accordance on the following calculation formulas to suit respective specialty chains.
The sprockets used for the following chains are the very same because the common sprockets in tooth gap type, but diverse in tooth thickness (sprocket tooth profile).
4. Calculation of sprocket dimensions
The dimensions of normal sprockets and also other standard sprockets are calculated as follows. In the beginning, the diameters of sprockets are calculated in the following calculation formulas.
Following, sprocket tooth profile (the form on the tooth according to its thickness) is calculated through the following calculation formulas. (The values shown in the following pages were calculated by these formulas and thought to be the normal values.)
Calculation formulas for diameters and tooth gap varieties Calculation formulas for diameters
Calculation of pitch diameter, tip diameter and caliper diameter
The fundamental dimensions of a sprocket ideal for any chain pitch of one mm are respectively named pitch diameter aspect, tip diameter aspect and caliper diameter component. The respective factors for respective numbers of teeth are listed below. If these components are multiplied by chain pitch, the basic dimensions with the corresponding sprocket may be obtained.
Instance:
During the situation of 80 (25.forty mm pitch) with 35 teeth Pitch diameter (Dp) = P×Pitch diameter element
Calculation formulas for tooth gap varieties
Since the most rational tooth gap forms through which the pressure angle changes in response to the elongation of a smoothly rotated roller chain with all the lapse of support time, ANSI specify two types of tooth profiles: U-type and S-type. In general, S-type tooth profiles are adopted in accordance with ANSI, and our regular sprockets also have S-tooth profiles.