Sprockets is usually classified into normal sprockets, HK sprockets and various sprockets.
one. Normal sprocket
Standard sprockets are ANSI sprockets which may be engaged with standard series roller chains. See P125 for dimensions.
There are two sorts of tooth profiles: U-tooth and S-tooth.
2. HK sprocket
HK sprockets could be engaged with HK series roller chains, and these for single strand chains are identical to common sprockets. Even so, sprockets for multiple strand chains are distinct from conventional sprockets in sprocket tooth profile.
three. Other sprockets
Other sprockets are intended in accordance towards the following calculation formulas to suit respective specialty chains.
The sprockets utilised for that following chains will be the similar as the regular sprockets in tooth gap kind, but unique in tooth thickness (sprocket tooth profile).
4. Calculation of sprocket dimensions
The dimensions of typical sprockets and various general sprockets are calculated as follows. At the outset, the diameters of sprockets are calculated in the following calculation formulas.
Following, sprocket tooth profile (the form on the tooth determined by its thickness) is calculated from the following calculation formulas. (The values shown inside the following pages were calculated by these formulas and regarded as the regular values.)
Calculation formulas for diameters and tooth gap kinds Calculation formulas for diameters
Calculation of pitch diameter, tip diameter and caliper diameter
The fundamental dimensions of the sprocket appropriate for a chain pitch of 1 mm are respectively known as pitch diameter component, tip diameter element and caliper diameter element. The respective things for respective numbers of teeth are listed beneath. If these variables are multiplied by chain pitch, the essential dimensions with the corresponding sprocket could be obtained.
Illustration:
Within the case of 80 (25.forty mm pitch) with 35 teeth Pitch diameter (Dp) ＝ P×Pitch diameter component
Calculation formulas for tooth gap forms
Since the most rational tooth gap forms during which the pressure angle adjustments in response to your elongation of a smoothly rotated roller chain with all the lapse of services time, ANSI specify two sorts of tooth profiles: U-type and S-type. On the whole, S-type tooth profiles are adopted in accordance with ANSI, and our standard sprockets also have S-tooth profiles.