Sprockets is usually classified into regular sprockets, HK sprockets as well as other sprockets.
one. Typical sprocket
Normal sprockets are ANSI sprockets which could be engaged with conventional series roller chains. See P125 for dimensions.
There are 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 common sprockets. On the other hand, sprockets for numerous strand chains are various from normal sprockets in sprocket tooth profile.
3. Other sprockets
Other sprockets are developed according for the following calculation formulas to suit respective specialty chains.
The sprockets utilised to the following chains would be the same as the regular sprockets in tooth gap kind, but diverse in tooth thickness (sprocket tooth profile).
four. Calculation of sprocket dimensions
The dimensions of conventional sprockets and also other basic sprockets are calculated as follows. At the outset, the diameters of sprockets are calculated through the following calculation formulas.
Up coming, sprocket tooth profile (the form from the tooth based on its thickness) is calculated from your following calculation formulas. (The values proven in the following pages have been calculated by these formulas and regarded as the common values.)
Calculation formulas for diameters and tooth gap forms Calculation formulas for diameters
Calculation of pitch diameter, tip diameter and caliper diameter
The fundamental dimensions of the sprocket appropriate for any chain pitch of one mm are respectively termed pitch diameter issue, tip diameter factor and caliper diameter issue. The respective things for respective numbers of teeth are listed below. If these things are multiplied by chain pitch, the basic dimensions on the corresponding sprocket is often obtained.
Illustration:
During the case of 80 (25.forty mm pitch) with 35 teeth Pitch diameter (Dp) ＝ P×Pitch diameter element
Calculation formulas for tooth gap forms
As the most rational tooth gap varieties through which the pressure angle modifications in response to the elongation of the smoothly rotated roller chain with all the lapse of support time, ANSI specify two forms of tooth profiles: U-type and S-type. On the whole, S-type tooth profiles are adopted in accordance with ANSI, and our normal sprockets also have S-tooth profiles.