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The Martin needle bearing idler sprocket is suitable for use with the series 35 chain, has a 3/8” pitch, and with 13 or 19 teeth, offers application deployment flexibility. Made from high carbon steel, it has high strength and durability.
The idler sprocket has the following options: 13 or 19 teeth; outer diameter encompassing the entire idler sprocket of 1.75” or 2.47”; stock bore size of 0.50” or 1.00”; length through bore size of 0.75” or 1.00”; tooth width of 0.168”; hub diameter of 1.18” or 1.84”; and a weight of 0.20 pounds or 0.50 pounds. The radial load capacity for a stock bore size of 0.50” is 1,021 pounds at 100 RPM, 630 pounds at 500 RPM, 512 pounds at 1,500 RPM, 416 pounds at 2,000 RPM, and 389 pounds at 2,500 RPM. For a stock bore size of 1.00”, the radial load capacity is 2,751 pounds at 100 RPM, 1,698 pounds at 500 RPM, 1,379 pounds at 1,000 RPM, 1,221 pounds at 1,500 RPM, 1,120 pounds at 2,000 RPM and 1,048 pounds at 2,500 RPM. Ratings are based on an average bearing life of 2,500 hours. All Martin sprockets meet or exceed ANSI standards.
As chains wear, they elongate, which can cause issues that affect performance and wear characteristics. Idler sprockets can be used to take up slack caused by elongation, to change the direction of rotation of a driven shaft, to guide chain around an obstruction, or to help provide more wrap (more teeth engaged with the chain) on another sprocket.
A sprocket is a wheel with teeth around the perimeter that meshes with a chain, track, or other perforated or indented material. Unlike gears that mesh with another gear, sprockets mesh with a chain, which then interacts with another sprocket. Gears can be used to transmit power around a corner, based on how they fit together. Sprockets with chains only work in straight lines. Some common benefits of chain-drive systems include minimal slippage, a fixed ratio between rotating shafts, and versatility with many different chain attachments and sprocket material selections. An example of a power transmission system is a standard bicycle, which has a sprocket and a chain to deliver power from the rider’s legs to the wheels making the bike move.
Martin Sprocket & Gear, founded in 1951, manufactures power transmission and conveying products using machining, fabrication, forging, casting, plastic injection molding, and powered metal technology. It has facilities throughout the U.S., as well as in Canada, Mexico, China, and Brazil.
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