Sprockets is usually classified into common sprockets, HK sprockets together with other sprockets.
one. Typical sprocket
Typical sprockets are ANSI sprockets which may be engaged with normal series roller chains. See P125 for dimensions.
You’ll find two types of tooth profiles: U-tooth and S-tooth.
2. HK sprocket
HK sprockets may be engaged with HK series roller chains, and individuals for single strand chains are identical to typical sprockets. On the other hand, sprockets for a number of strand chains are different from normal sprockets in sprocket tooth profile.
3. Other sprockets
Other sprockets are built in accordance on the following calculation formulas to suit respective specialty chains.
The sprockets used to the following chains would be the similar as the common sprockets in tooth gap kind, but diverse in tooth thickness (sprocket tooth profile).
4. Calculation of sprocket dimensions
The dimensions of typical sprockets as well as other general sprockets are calculated as follows. To start with, the diameters of sprockets are calculated in the following calculation formulas.
Following, sprocket tooth profile (the shape on the tooth depending on its thickness) is calculated from your following calculation formulas. (The values proven while in the following pages have been calculated by these formulas and thought to be the normal values.)
Calculation formulas for diameters and tooth gap varieties Calculation formulas for diameters
Calculation of pitch diameter, tip diameter and caliper diameter
The basic dimensions of a sprocket suitable for a chain pitch of one mm are respectively termed pitch diameter aspect, tip diameter factor and caliper diameter aspect. The respective components for respective numbers of teeth are listed beneath. If these factors are multiplied by chain pitch, the basic dimensions with the corresponding sprocket may be obtained.
Example:
Inside the case of 80 (25.forty mm pitch) with 35 teeth Pitch diameter (Dp) ＝ P×Pitch diameter factor
Calculation formulas for tooth gap forms
As the most rational tooth gap forms during which the strain angle improvements in response towards the elongation of the smoothly rotated roller chain with all the lapse of support time, ANSI specify two types 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.