Applications
RS (single pitch) Top Roller Chain can only be equipped with an S-roller. R- rollers and S-rollers are available for RF (double pitch) Top Roller Chain. The features of Top Roller Chain include the following points: (1) High maximum allowable tension. (2) Economical cost. (3) Lower stability than Side Roller Chain, because Top Roller Chain is narrower. (4) Snap covers are not available for Top Roller Chain. It is difficult to prevent small objects from falling in between chain components. (5) Noise levels during operation are higher than those for DOUBLE PLUS ® Chain. (Noise is about equal to Side Roller Chain.) (6) Top Roller Chain installation kits, including the guide rails and other components, are not commonly available. Sprockets Standard sprockets can be used with RS (single pitch) chain and with RF (double pitch) chain with S-rollers. Other types of Top Roller Chain require special sprockets. Selection and Handling Top Roller Chains are available with R-rollers and with S-rollers. The use of R-rollers is preferred, especially if either of the following conditions exists: • The overall length of the equipment is more than 10 m. • The chain speed is more than 20 m/min. R-rollers have lower coefficient of friction (without lubrication, R-roller: 0.12; S-roller: 0.21). Chains for Special Applications Top Roller Chains can be made of stainless steel, carbon steel, or plated carbon steel. LAMBDA ® Top Roller Chain is available for lube-free operations. Engineered plastic top rollers should be used in this construction because they are lube-free. Two types of Top Roller Chains have higher stability than standard Top Roller Chains (Figure 5.13). They are: • TG-form with SK attachments that point downward. • Double Strand Top Roller Chain. Please refer to Plus α Alpha catalog for additional information.
Special Attachment for Prevention of Turnover
Double Strand Top Roller
TG
TR
Figure 5.13 Types of Higher Stability Top Roller Chain
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