Sprockets is often classified into standard sprockets, HK sprockets and also other sprockets.
1. Normal sprocket
Regular sprockets are ANSI sprockets which might be engaged with regular 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 is often engaged with HK series roller chains, and individuals for single strand chains are identical to conventional sprockets. Nevertheless, sprockets for a number of strand chains are diverse from typical sprockets in sprocket tooth profile.
three. Other sprockets
Other sprockets are developed according on the following calculation formulas to suit respective specialty chains.
The sprockets applied for your following chains would be the similar as the conventional sprockets in tooth gap type, but distinct in tooth thickness (sprocket tooth profile).
4. Calculation of sprocket dimensions
The dimensions of normal sprockets along with other general sprockets are calculated as follows. Initially, the diameters of sprockets are calculated in the following calculation formulas.
Following, sprocket tooth profile (the shape from the tooth dependant upon its thickness) is calculated in the following calculation formulas. (The values shown within the following pages have been calculated by these formulas and regarded as the conventional values.)
Calculation formulas for diameters and tooth gap varieties Calculation formulas for diameters
Calculation of pitch diameter, tip diameter and caliper diameter
The fundamental dimensions of a sprocket ideal to get a chain pitch of 1 mm are respectively named pitch diameter component, tip diameter element and caliper diameter element. The respective elements for respective numbers of teeth are listed below. If these components are multiplied by chain pitch, the essential dimensions of the corresponding sprocket is often obtained.
Example:
From the case of 80 (25.40 mm pitch) with 35 teeth Pitch diameter (Dp) ＝ P×Pitch diameter issue
Calculation formulas for tooth gap types
Because the most rational tooth gap types during which the stress angle changes in response on the elongation of the smoothly rotated roller chain with the lapse of support 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 common sprockets also have S-tooth profiles.