Sprockets might be classified into regular sprockets, HK sprockets and other sprockets.
one. Regular sprocket
Standard sprockets are ANSI sprockets which could be engaged with regular series roller chains. See P125 for dimensions.
You’ll find two types of tooth profiles: U-tooth and S-tooth.
2. HK sprocket
HK sprockets is often engaged with HK series roller chains, and individuals for single strand chains are identical to standard sprockets. Even so, sprockets for many strand chains are different from typical sprockets in sprocket tooth profile.
3. Other sprockets
Other sprockets are intended in accordance towards the following calculation formulas to suit respective specialty chains.
The sprockets used for the following chains will be the exact same as the common sprockets in tooth gap form, but diverse in tooth thickness (sprocket tooth profile).
four. Calculation of sprocket dimensions
The dimensions of common sprockets together with other standard sprockets are calculated as follows. At first, the diameters of sprockets are calculated from your following calculation formulas.
Up coming, sprocket tooth profile (the form of your tooth based upon 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 kinds Calculation formulas for diameters
Calculation of pitch diameter, tip diameter and caliper diameter
The basic dimensions of a sprocket suitable for a chain pitch of 1 mm are respectively called pitch diameter component, tip diameter factor and caliper diameter issue. The respective things for respective numbers of teeth are listed under. If these elements are multiplied by chain pitch, the basic dimensions in the corresponding sprocket may be obtained.
Illustration:
During the situation of 80 (25.forty mm pitch) with 35 teeth Pitch diameter (Dp) = P×Pitch diameter factor
Calculation formulas for tooth gap forms
Because the most rational tooth gap forms by which the stress angle alterations in response to the elongation of a smoothly rotated roller chain with the lapse of support time, ANSI specify two varieties of tooth profiles: U-type and S-type. Usually, S-type tooth profiles are adopted in accordance with ANSI, and our typical sprockets also have S-tooth profiles.