Sprockets might be classified into normal sprockets, HK sprockets along with other sprockets.
one. Normal sprocket
Typical sprockets are ANSI sprockets which might be engaged with conventional series roller chains. See P125 for dimensions.
There are actually two kinds of tooth profiles: U-tooth and S-tooth.
two. HK sprocket
HK sprockets may be engaged with HK series roller chains, and those for single strand chains are identical to conventional sprockets. Nevertheless, sprockets for a number of strand chains are unique from regular sprockets in sprocket tooth profile.
three. Other sprockets
Other sprockets are designed in accordance for the following calculation formulas to suit respective specialty chains.
The sprockets used for the following chains will be the same as the normal sprockets in tooth gap form, but unique in tooth thickness (sprocket tooth profile).
four. Calculation of sprocket dimensions
The dimensions of conventional sprockets and various general sprockets are calculated as follows. In the beginning, the diameters of sprockets are calculated from your following calculation formulas.
Following, sprocket tooth profile (the shape on the tooth dependant upon its thickness) is calculated through the following calculation formulas. (The values proven in the following pages have been calculated by these formulas and regarded as the common 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 the sprocket ideal for a chain pitch of one mm are respectively termed pitch diameter factor, tip diameter factor and caliper diameter issue. The respective factors for respective numbers of teeth are listed beneath. If these variables are multiplied by chain pitch, the basic dimensions from the corresponding sprocket could be obtained.
Illustration:
Inside the situation of 80 (25.40 mm pitch) with 35 teeth Pitch diameter (Dp) = P×Pitch diameter issue
Calculation formulas for tooth gap types
Since the most rational tooth gap varieties through which the pressure angle improvements in response towards the elongation of a smoothly rotated roller chain with the lapse of services time, ANSI specify two kinds of tooth profiles: U-type and S-type. Normally, S-type tooth profiles are adopted in accordance with ANSI, and our typical sprockets also have S-tooth profiles.