8 RS Roller Chain Installation and Layout
Speed Ratio and Chain Lap The speed ratio of RS Roller Chain can range up to 7:1 under normal conditions. However, a speed ratio of 10:1 is possible if the required speed is very slow. Chain lap on the small sprocket must be at least 120 degrees. Distance Between Shafts Optimum distance between sprockets is 30 to 50 times the pitch of the chain, except when there is a pulsating load. In such cases, the distance can be up to 20 times the pitch of the chain. Layout When arranging the roller chain drive, the centerline of both sprockets should be as close to horizontal as possible, though the angle of installation can be up to 60 degrees. If installation is close to vertical, slight chain elongation can cause the chain to easily slip off the sprockets. In this case, an idler or guide stopper is recommended.
Figure 8-1: General Arrangement
Note: Driving shaft is shown by oblique lines. It is best to keep the angle of installation within 60 degrees. If the angle must be more than 60 degrees, refer to the instructions for vertical centerlines (No. 3) in the next section.
RS R OLLER C HAIN I NSTALLATION AND L AYOUT 13
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