5 Sprockets for RS Roller Chain Good quality sprockets are essential for maximum power transmission efficiency. The tooth configurations of U.S. Tsubaki Sprockets conform to JIS and ANSI standards. All U.S. Tsubaki Sprockets are precision components with finely balanced boss and rim parts that are exactly in accordance with U.S. Tsubaki’s stated specifications.
A Type
B Type
C Type
Double-strand Double-strand B Type C Type
Figure 5-1: Sprocket Types
Sprocket Materials Suitable sprocket materials should be selected according to the working conditions and requirements of the application. Proper selection will result in higher performance and better cost-effectiveness.
Table 5-1: Sprocket Materials Sprocket Type
Material
A Type
Low Carbon Steel
B Type
High Carbon Steel
Ductile Cast Iron (RS40~RS120) Cast Iron (RS140~RS160)
C Type
High Frequency Hardening for Tips of Sprocket Teeth Roller chain is often used for high-speed power transmission. For these applications, use standard sprockets with fewer teeth that have been hardened at the tooth tips by high frequency hardening, such as single-row, B Type Sprockets for RS35~RS100 chain and double-row, B Type Sprockets for RS40~RS100. Hardening for the tips of sprocket teeth is required in the following cases: 1. For sprockets with up to 24 teeth used at speeds of more than one-eighth of the maximum speed specified for RS Roller Chain 2. For small sprockets and speed ratios of more than 1:4 3. For use with heavy loads at low speeds 4. For use in abrasive conditions Shaft Hole Processing If the shaft hole is to be processed by the customer, processing should be based on the tooth bottom. Keyway and shaft hole dimensions are required for processing done by U.S. Tsubaki.
8 I NSTALLATION & M AINTENANCE
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