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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.
Figure 10 - QD sprocket
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Figure 11 - TAPER-LOCK sprocket
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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.
Figure 12 - Steel Split sprocket
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