Sprockets can be classified into common sprockets, HK sprockets and also other sprockets.
1. Standard sprocket
Typical sprockets are ANSI sprockets which could be engaged with regular 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 often engaged with HK series roller chains, and individuals for single strand chains are identical to typical sprockets. On the other hand, sprockets for several strand chains are diverse from typical sprockets in sprocket tooth profile.
3. Other sprockets
Other sprockets are made in accordance to your following calculation formulas to suit respective specialty chains.
The sprockets applied to the following chains would be the same because the regular sprockets in tooth gap form, but unique in tooth thickness (sprocket tooth profile).
four. Calculation of sprocket dimensions
The dimensions of conventional sprockets together with other basic sprockets are calculated as follows. At the outset, the diameters of sprockets are calculated from the following calculation formulas.
Following, sprocket tooth profile (the form on the tooth dependant upon its thickness) is calculated from the following calculation formulas. (The values shown inside the following pages have been 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 termed pitch diameter component, tip diameter aspect and caliper diameter factor. The respective elements for respective numbers of teeth are listed beneath. If these elements are multiplied by chain pitch, the fundamental dimensions with the corresponding sprocket is usually obtained.
Example:
Within the case of 80 (25.forty mm pitch) with 35 teeth Pitch diameter (Dp) ＝ P×Pitch diameter element
Calculation formulas for tooth gap forms
Because the most rational tooth gap forms in which the stress angle alterations in response for the elongation of a smoothly rotated roller chain with 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 typical sprockets also have S-tooth profiles.