Sprockets is usually classified into standard sprockets, HK sprockets and other sprockets.
1. Standard sprocket
Normal sprockets are ANSI sprockets which can be engaged with normal series roller chains. See P125 for dimensions.
You’ll find two varieties of tooth profiles: U-tooth and S-tooth.
two. HK sprocket
HK sprockets is usually engaged with HK series roller chains, and those for single strand chains are identical to normal sprockets. Nonetheless, sprockets for a number of strand chains are different from conventional sprockets in sprocket tooth profile.
three. Other sprockets
Other sprockets are made according towards the following calculation formulas to suit respective specialty chains.
The sprockets applied for that following chains would be the exact same as the standard sprockets in tooth gap form, but various in tooth thickness (sprocket tooth profile).
four. Calculation of sprocket dimensions
The dimensions of standard sprockets as well as other basic sprockets are calculated as follows. At first, the diameters of sprockets are calculated from the following calculation formulas.
Subsequent, sprocket tooth profile (the shape from the tooth depending on its thickness) is calculated from your following calculation formulas. (The values shown while in the following pages had been calculated by these formulas and regarded as the standard values.)
Calculation formulas for diameters and tooth gap types Calculation formulas for diameters
Calculation of pitch diameter, tip diameter and caliper diameter
The basic dimensions of a sprocket appropriate to get a chain pitch of 1 mm are respectively known as pitch diameter component, tip diameter component and caliper diameter element. The respective variables for respective numbers of teeth are listed under. If these aspects are multiplied by chain pitch, the essential dimensions in the corresponding sprocket is usually obtained.
Example:
Inside the case of 80 (25.40 mm pitch) with 35 teeth Pitch diameter (Dp) ＝ P×Pitch diameter factor
Calculation formulas for tooth gap types
Because the most rational tooth gap varieties by which the strain angle improvements in response on the elongation of the smoothly rotated roller chain using the lapse of service time, ANSI specify two forms of tooth profiles: U-type and S-type. On the whole, S-type tooth profiles are adopted in accordance with ANSI, and our conventional sprockets also have S-tooth profiles.