SPROCKETS 101
SPROCKETS 101
Small and Large Roller Double Pitch Sprockets:
QD ® Sprockets: This type of sprocket is used in applications where higher working loads are prevalent, and high clamp loading on the drive shaft is desirable. Sprockets with tapered bushings will fall into the QD ® , Split-Taper or TAPER-LOCK ® family. QD ® bushings are flanged, and most commonly utilize large anchor bolts around the circumference of the flange to retain itself to the sprocket. However, this style of bushing is also available in a weld on hub configuration. One of the primary advantages the QD ® bushing offers is its ease of installation and removal. It also provides superior clamp force, and aligns the sprocket 90 0 to the drive shaft to assure proper alignment. Please refer to Figure 10 for an illustration of a QD ® sprocket. TAPER-LOCK ® Sprockets: TAPER-LOCK ® bushings are similar to QD ® style bushings in that they both utilize a split through the taper and flange to provide a true clamp on the shaft that is equivalent to a shrink fit. This type of bushing is retained to the sprocket with a series of set screws on the outside diameter of the bushing running parallel to the shaft, or can be welded to the sprocket itself. With TAPER-LOCK ® bushings, there is no need for a set screw over the drive shaft key. TAPER-LOCK ® bushings offer flexibility in that they allow multiple sized bores for a single bushing size. Please refer to Figure 11 for an illustration of a TAPER- LOCK ® sprocket. Steel Split Sprockets: Split sprockets are slit through the entire diameter of the sprocket to allow ease of installation and removal. The sprocket halves are held together by bolts located on either side of the hub. This particular style is available in chain pitch sizes of 40 through 240, and bore diameters of 3/4" through 6" depending on chain pitch selected. Figure 12 provides an illustration of a steel split sprocket.
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Used with double pitch conveyor series roller chains. These chains are available with either the standard small roller diameter (i.e.: 2040, 2050, 2060, 2080, 2100) or a larger diameter chain roller style (i.e.: 2042, 2052, 2062, 2082, 2102). Sprockets are available from stock to accommodate either style. This type of sprocket is primarily used in conveying applications where torque requirements are lower, and long service life is critical. Please refer to Figure 7 for an illustration of a standard and double pitch sprocket for comparison purposes. Multiple-Strand Sprockets: This type of sprocket is commonly used in applications where higher torque and power requirements are needed. The spacing between the rows of teeth corresponds with the center-line of chain strands. Due to the added width of chain, the “LTB” of multiple strand sprockets is correspondingly longer. This style of sprocket is available in 40 through 160 chain pitch with plain, finished or TAPER-LOCK ® /QD ® style hubs. Please refer to Figure 8 for an illustration of a Multiple-Strand sprocket. DOUBLE PLUS ® Sprockets: This type of sprocket is specifically designed to work with DOUBLE PLUS ® chain. This style of sprocket is used in conveyor applications where product on the conveyor is propelled at twice speed of the drive system powering the conveyor. The main benefit of incorporating DOUBLE PLUS ® chain and sprockets is less noise and longer chain life. Please refer to Figure 9 for an illustration of a DOUBLE PLUS ® sprocket.
Figure 7 - Small and large roller double pitch sprockets
Figure 10 - QD ® sprocket
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Figure 8 - Multiple-Strand sprockets
Figure 11 - TAPER-LOCK ® sprocket
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Figure 9 - DOUBLE PLUS ® sprockets
Figure 12 - Steel Split sprocket
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