Sprockets could be classified into conventional sprockets, HK sprockets and other sprockets.
1. Normal sprocket
Regular sprockets are ANSI sprockets which might be engaged with standard series roller chains. See P125 for dimensions.
You can find two varieties of tooth profiles: U-tooth and S-tooth.
2. HK sprocket
HK sprockets might be engaged with HK series roller chains, and people for single strand chains are identical to regular sprockets. Even so, sprockets for several strand chains are diverse from standard sprockets in sprocket tooth profile.
three. Other sprockets
Other sprockets are made in accordance to the following calculation formulas to suit respective specialty chains.
The sprockets utilised to the following chains will be the very same as the normal sprockets in tooth gap type, but distinct in tooth thickness (sprocket tooth profile).
4. Calculation of sprocket dimensions
The dimensions of conventional sprockets and other general sprockets are calculated as follows. To start with, the diameters of sprockets are calculated from the following calculation formulas.
Next, sprocket tooth profile (the shape in the tooth according to its thickness) is calculated in the following calculation formulas. (The values proven in the following pages have been calculated by these formulas and thought to be the regular values.)
Calculation formulas for diameters and tooth gap types Calculation formulas for diameters
Calculation of pitch diameter, tip diameter and caliper diameter
The essential dimensions of a sprocket appropriate to get a chain pitch of one mm are respectively known as pitch diameter element, tip diameter component and caliper diameter component. The respective aspects for respective numbers of teeth are listed beneath. If these things are multiplied by chain pitch, the fundamental dimensions with the corresponding sprocket could be obtained.
Illustration:
Within the situation of 80 (25.40 mm pitch) with 35 teeth Pitch diameter (Dp) ＝ P×Pitch diameter element
Calculation formulas for tooth gap types
Since the most rational tooth gap types through which the stress angle alterations in response on the elongation of the smoothly rotated roller chain together with the lapse of service time, ANSI specify two varieties of tooth profiles: U-type and S-type. On the whole, S-type tooth profiles are adopted in accordance with ANSI, and our typical sprockets also have S-tooth profiles.