Sprockets is often classified into conventional sprockets, HK sprockets and various sprockets.
1. Standard sprocket
Common sprockets are ANSI sprockets which could be engaged with normal series roller chains. See P125 for dimensions.
You will find two kinds of tooth profiles: U-tooth and S-tooth.
2. HK sprocket
HK sprockets is often engaged with HK series roller chains, and those for single strand chains are identical to normal sprockets. Nevertheless, sprockets for several strand chains are distinctive from typical sprockets in sprocket tooth profile.
3. Other sprockets
Other sprockets are created 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 form, but various in tooth thickness (sprocket tooth profile).
four. Calculation of sprocket dimensions
The dimensions of conventional sprockets and other basic sprockets are calculated as follows. At the outset, the diameters of sprockets are calculated through the following calculation formulas.
Next, sprocket tooth profile (the shape from the tooth depending on its thickness) is calculated from your following calculation formulas. (The values proven from the following pages had been calculated by these formulas and regarded as the standard 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 appropriate to get a chain pitch of 1 mm are respectively known as pitch diameter issue, tip diameter issue and caliper diameter aspect. The respective aspects for respective numbers of teeth are listed under. If these elements are multiplied by chain pitch, the fundamental dimensions from the corresponding sprocket is often obtained.
Example:
While in the case of 80 (25.40 mm pitch) with 35 teeth Pitch diameter (Dp) ＝ P×Pitch diameter factor
Calculation formulas for tooth gap kinds
As the most rational tooth gap kinds by which the stress angle alterations in response for the elongation of the smoothly rotated roller chain with the lapse of services time, ANSI specify two varieties of tooth profiles: U-type and S-type. Normally, S-type tooth profiles are adopted in accordance with ANSI, and our typical sprockets also have S-tooth profiles.