General Guidelines for Silent Chain Drive Selection

GENERAL GUIDELINES FOR SILENT CHAIN DRIVE SELECTION 

Selecting a silent chain drive consists of choosing a chain and sprockets that best satisfy the specified requirements. In most cases, this is a multistep process, the first step of which is obtaining a chain and sprockets that fit in the available space and that will work at the required loads and speeds. Often, more than one combination of chain and sprocket sizes will work in a given situation, so it is good practice to consider two or three alternatives. A final selection is made from the alternatives by considering other important factors such as cost, stock availability, and desired life. 

Most chain manufacturers offer drive selection manuals and technical assistance to aid in the selection of their products. Many also offer computer programs to simplify the selection process. One should consult the chain manufacturer for help when selecting drives that have large capital costs or operate in unusual and extreme conditions. 

Generally, small pitches operate smoother at high speeds. Larger pitches offer higher torque capacity, but at lower speeds. 

Silent chain power capaeity is rated in units of power per unit of chain width. For any given pitch, increased chain width results in greater chain strength, increased power capacity, and increased cost. When several chain widths satisfy the specified requirements, narrower chain widths are generally more readily obtained and less costly. Wider chains will provide a more robust, shock-resistant drive. 

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