Sprockets is often classified into regular sprockets, HK sprockets and other sprockets.
one. Standard sprocket
Regular sprockets are ANSI sprockets which could be engaged with conventional series roller chains. See P125 for dimensions.
You will discover two varieties of tooth profiles: U-tooth and S-tooth.
two. HK sprocket
HK sprockets could be engaged with HK series roller chains, and individuals for single strand chains are identical to conventional sprockets. Even so, sprockets for various strand chains are diverse from typical sprockets in sprocket tooth profile.
3. Other sprockets
Other sprockets are built in accordance to your following calculation formulas to suit respective specialty chains.
The sprockets utilized for the following chains would be the similar because the common sprockets in tooth gap type, but unique in tooth thickness (sprocket tooth profile).
four. Calculation of sprocket dimensions
The dimensions of standard sprockets along with other common sprockets are calculated as follows. To start with, the diameters of sprockets are calculated through the following calculation formulas.
Following, sprocket tooth profile (the shape on the tooth based upon its thickness) is calculated in the following calculation formulas. (The values proven while in the following pages had been calculated by these formulas and regarded as the regular values.)
Calculation formulas for diameters and tooth gap forms 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 1 mm are respectively named pitch diameter component, tip diameter component and caliper diameter factor. The respective elements for respective numbers of teeth are listed below. If these factors are multiplied by chain pitch, the fundamental dimensions of your corresponding sprocket is often obtained.
Instance:
In the case of 80 (25.forty mm pitch) with 35 teeth Pitch diameter (Dp) ＝ P×Pitch diameter factor
Calculation formulas for tooth gap forms
Because the most rational tooth gap kinds in which the pressure angle changes in response on the elongation of a smoothly rotated roller chain with all the lapse of support time, ANSI specify two kinds of tooth profiles: U-type and S-type. Usually, S-type tooth profiles are adopted in accordance with ANSI, and our regular sprockets also have S-tooth profiles.