Sprockets might be classified into conventional sprockets, HK sprockets and other sprockets.
one. Common sprocket
Normal sprockets are ANSI sprockets which may be engaged with normal series roller chains. See P125 for dimensions.
You can find two kinds of tooth profiles: U-tooth and S-tooth.
2. HK sprocket
HK sprockets may be engaged with HK series roller chains, and people for single strand chains are identical to regular sprockets. However, sprockets for several strand chains are distinct from normal sprockets in sprocket tooth profile.
3. Other sprockets
Other sprockets are intended according to your following calculation formulas to suit respective specialty chains.
The sprockets utilised to the following chains would be the very same because the normal sprockets in tooth gap type, but distinctive in tooth thickness (sprocket tooth profile).
four. Calculation of sprocket dimensions
The dimensions of common sprockets as well as other standard sprockets are calculated as follows. In the beginning, the diameters of sprockets are calculated through the following calculation formulas.
Next, sprocket tooth profile (the shape of the tooth according to its thickness) is calculated from the following calculation formulas. (The values shown from the following pages had been calculated by these formulas and regarded as the normal values.)
Calculation formulas for diameters and tooth gap kinds Calculation formulas for diameters
Calculation of pitch diameter, tip diameter and caliper diameter
The fundamental dimensions of a sprocket appropriate for any chain pitch of 1 mm are respectively called pitch diameter aspect, tip diameter aspect and caliper diameter element. The respective factors for respective numbers of teeth are listed below. If these elements are multiplied by chain pitch, the fundamental dimensions from the corresponding sprocket is usually obtained.
Example:
While in the situation of 80 (25.40 mm pitch) with 35 teeth Pitch diameter (Dp) ＝ P×Pitch diameter factor
Calculation formulas for tooth gap varieties
Because the most rational tooth gap varieties through which the strain angle improvements in response for the elongation of a smoothly rotated roller chain with all the lapse of service time, ANSI specify two kinds of tooth profiles: U-type and S-type. Generally, S-type tooth profiles are adopted in accordance with ANSI, and our typical sprockets also have S-tooth profiles.