Sprockets might be classified into regular sprockets, HK sprockets and various sprockets.
one. Normal sprocket
Conventional sprockets are ANSI sprockets which could be engaged with regular series roller chains. See P125 for dimensions.
You will 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 standard sprockets. Nevertheless, sprockets for a number of strand chains are different from normal sprockets in sprocket tooth profile.
3. Other sprockets
Other sprockets are made in accordance towards the following calculation formulas to suit respective specialty chains.
The sprockets made use of for the following chains will be the exact same as the normal sprockets in tooth gap form, but distinct 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. Initially, the diameters of sprockets are calculated in the following calculation formulas.
Subsequent, sprocket tooth profile (the form of the tooth based upon its thickness) is calculated in the following calculation formulas. (The values proven in the following pages were 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 termed pitch diameter factor, tip diameter factor and caliper diameter element. The respective factors for respective numbers of teeth are listed under. If these elements are multiplied by chain pitch, the basic dimensions of the corresponding sprocket is usually obtained.
Instance:
In the situation of 80 (25.forty mm pitch) with 35 teeth Pitch diameter (Dp) ＝ P×Pitch diameter aspect
Calculation formulas for tooth gap forms
Because the most rational tooth gap forms in which the pressure angle adjustments in response to the elongation of a smoothly rotated roller chain together with the lapse of support time, ANSI specify two varieties of tooth profiles: U-type and S-type. On the whole, S-type tooth profiles are adopted in accordance with ANSI, and our conventional sprockets also have S-tooth profiles.