Dimensions of Sprocket

Sprockets is usually classified into conventional sprockets, HK sprockets and other sprockets.
one. Normal sprocket
Standard sprockets are ANSI sprockets which can be engaged with typical series roller chains. See P125 for dimensions.
There are actually two kinds of tooth profiles: U-tooth and S-tooth.
2. HK sprocket
HK sprockets can be engaged with HK series roller chains, and people for single strand chains are identical to typical sprockets. On the other hand, sprockets for a number of strand chains are unique from normal sprockets in sprocket tooth profile.
three. Other sprockets
Other sprockets are intended according for the following calculation formulas to suit respective specialty chains.
The sprockets utilised for that following chains would be the very same because the standard sprockets in tooth gap type, but various in tooth thickness (sprocket tooth profile).
4. Calculation of sprocket dimensions
The dimensions of typical sprockets and also other standard sprockets are calculated as follows. To start with, the diameters of sprockets are calculated from your following calculation formulas.
Upcoming, sprocket tooth profile (the shape with the tooth determined by its thickness) is calculated in the following calculation formulas. (The values shown in the following pages were calculated by these formulas and regarded as the conventional values.)
Calculation formulas for diameters and tooth gap types Calculation formulas for diameters
Calculation of pitch diameter, tip diameter and caliper diameter
The essential dimensions of a sprocket ideal for any chain pitch of one mm are respectively identified as pitch diameter element, tip diameter component and caliper diameter component. The respective elements for respective numbers of teeth are listed below. If these elements are multiplied by chain pitch, the basic dimensions from the corresponding sprocket could be obtained.
Illustration:
From the case of 80 (25.40 mm pitch) with 35 teeth Pitch diameter (Dp) ＝ P×Pitch diameter element
Calculation formulas for tooth gap varieties
Because the most rational tooth gap forms by which the pressure angle changes in response for the elongation of the smoothly rotated roller chain using the lapse of service time, ANSI specify two sorts of tooth profiles: U-type and S-type. In general, S-type tooth profiles are adopted in accordance with ANSI, and our conventional sprockets also have S-tooth profiles.