Sprockets is usually classified into typical sprockets, HK sprockets and various sprockets.
1. Common sprocket
Typical sprockets are ANSI sprockets which could be engaged with conventional series roller chains. See P125 for dimensions.
You’ll find two kinds of tooth profiles: U-tooth and S-tooth.
two. HK sprocket
HK sprockets is usually engaged with HK series roller chains, and individuals for single strand chains are identical to typical sprockets. However, sprockets for numerous strand chains are distinctive from common sprockets in sprocket tooth profile.
three. Other sprockets
Other sprockets are made according for the following calculation formulas to suit respective specialty chains.
The sprockets utilized for your following chains would be the similar because the normal sprockets in tooth gap kind, but distinct in tooth thickness (sprocket tooth profile).
four. Calculation of sprocket dimensions
The dimensions of normal sprockets and various common sprockets are calculated as follows. At first, the diameters of sprockets are calculated through the following calculation formulas.
Following, sprocket tooth profile (the shape with the tooth dependant upon its thickness) is calculated in the following calculation formulas. (The values proven during the following pages had been calculated by these formulas and thought to be the regular 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 suitable for any chain pitch of 1 mm are respectively identified as pitch diameter aspect, tip diameter element and caliper diameter component. The respective variables for respective numbers of teeth are listed beneath. If these aspects are multiplied by chain pitch, the essential dimensions with the corresponding sprocket can be obtained.
Illustration:
In the case of 80 (25.40 mm pitch) with 35 teeth Pitch diameter (Dp) = P×Pitch diameter aspect
Calculation formulas for tooth gap kinds
Because the most rational tooth gap forms in which the pressure angle alterations in response towards the elongation of the smoothly rotated roller chain with the lapse of support time, ANSI specify two sorts of tooth profiles: U-type and S-type. Generally, S-type tooth profiles are adopted in accordance with ANSI, and our common sprockets also have S-tooth profiles.