Sprockets is often classified into standard sprockets, HK sprockets and other sprockets.
one. Common sprocket
Typical sprockets are ANSI sprockets which can be engaged with conventional 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 could be engaged with HK series roller chains, and people for single strand chains are identical to conventional sprockets. On the other hand, sprockets for several strand chains are various from regular sprockets in sprocket tooth profile.
3. Other sprockets
Other sprockets are created according to your following calculation formulas to suit respective specialty chains.
The sprockets used to the following chains are the similar as the regular sprockets in tooth gap form, but various in tooth thickness (sprocket tooth profile).
four. Calculation of sprocket dimensions
The dimensions of regular sprockets together with other common sprockets are calculated as follows. In the beginning, the diameters of sprockets are calculated from the following calculation formulas.
Up coming, sprocket tooth profile (the shape from the tooth according to its thickness) is calculated from your following calculation formulas. (The values shown inside the following pages were 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 ideal for a chain pitch of 1 mm are respectively called pitch diameter issue, tip diameter aspect and caliper diameter aspect. The respective elements for respective numbers of teeth are listed beneath. If these aspects are multiplied by chain pitch, the essential dimensions in the corresponding sprocket is often obtained.
Illustration:
During the case of 80 (25.40 mm pitch) with 35 teeth Pitch diameter (Dp) ＝ P×Pitch diameter element
Calculation formulas for tooth gap varieties
Since the most rational tooth gap forms by which the pressure angle alterations in response to the elongation of a smoothly rotated roller chain together with the lapse of service time, ANSI specify two types of tooth profiles: U-type and S-type. Usually, S-type tooth profiles are adopted in accordance with ANSI, and our normal sprockets also have S-tooth profiles.