Sprockets could be classified into conventional sprockets, HK sprockets along with other sprockets.
1. Common sprocket
Normal sprockets are ANSI sprockets which can be engaged with regular series roller chains. See P125 for dimensions.
You will find two kinds of tooth profiles: U-tooth and S-tooth.
2. HK sprocket
HK sprockets is often engaged with HK series roller chains, and people for single strand chains are identical to standard sprockets. Even so, sprockets for various strand chains are unique from standard sprockets in sprocket tooth profile.
3. Other sprockets
Other sprockets are developed according for the following calculation formulas to suit respective specialty chains.
The sprockets made use of to the following chains would be the same as the common sprockets in tooth gap form, but different in tooth thickness (sprocket tooth profile).
4. Calculation of sprocket dimensions
The dimensions of normal sprockets and other common sprockets are calculated as follows. To start with, the diameters of sprockets are calculated through the following calculation formulas.
Subsequent, sprocket tooth profile (the shape with the tooth based on its thickness) is calculated from your following calculation formulas. (The values shown from the following pages were calculated by these formulas and thought to be 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 suitable to get a chain pitch of 1 mm are respectively referred to as pitch diameter issue, tip diameter element and caliper diameter issue. The respective factors for respective numbers of teeth are listed beneath. If these variables are multiplied by chain pitch, the fundamental dimensions with the corresponding sprocket may be obtained.
Example:
While in the situation 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 varieties by which the pressure angle modifications in response towards the elongation of a smoothly rotated roller chain with the lapse of service time, ANSI specify two kinds of tooth profiles: U-type and S-type. On the whole, S-type tooth profiles are adopted in accordance with ANSI, and our standard sprockets also have S-tooth profiles.