Sprockets is often classified into standard sprockets, HK sprockets together with other sprockets.
1. Conventional sprocket
Standard sprockets are ANSI sprockets which may be engaged with regular series roller chains. See P125 for dimensions.
You’ll find two forms of tooth profiles: U-tooth and S-tooth.
2. HK sprocket
HK sprockets may be engaged with HK series roller chains, and those for single strand chains are identical to normal sprockets. Having said that, sprockets for many strand chains are various from normal sprockets in sprocket tooth profile.
three. Other sprockets
Other sprockets are designed according on the following calculation formulas to suit respective specialty chains.
The sprockets employed for the following chains will be the similar since the standard sprockets in tooth gap kind, but distinctive in tooth thickness (sprocket tooth profile).
four. Calculation of sprocket dimensions
The dimensions of regular sprockets together with other standard sprockets are calculated as follows. At first, the diameters of sprockets are calculated through the following calculation formulas.
Upcoming, sprocket tooth profile (the form from the tooth based upon its thickness) is calculated in the following calculation formulas. (The values shown in the following pages have been calculated by these formulas and regarded as the standard 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 any chain pitch of one mm are respectively identified as pitch diameter aspect, tip diameter element and caliper diameter issue. The respective elements for respective numbers of teeth are listed beneath. If these elements are multiplied by chain pitch, the fundamental dimensions of the corresponding sprocket may be obtained.
Example:
During the situation of 80 (25.40 mm pitch) with 35 teeth Pitch diameter (Dp) ＝ P×Pitch diameter factor
Calculation formulas for tooth gap kinds
As the most rational tooth gap types during which the stress angle alterations in response to the elongation of a smoothly rotated roller chain using the lapse of services time, ANSI specify two forms 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.