SPROCKETS 101
SPROCKETS 101
11. 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.
14. British Standard Sprockets: This style of sprocket is similar to an ANSI style sprocket with the exception of the fact that it is designed to propel British Standard Chain. British Standard Chain has slightly different dimensions with regard to chain pitch and roller diameter. ANSI Standard chain pitch is measured in 1/8” increments (pin to pin), whereas British Standard follows a 1/16” pin to pin spacing. . 15. Double Single Sprockets: This type of sprocket is commonly used in applications where two or more items are powered by a common drive shaft. The space between the sprocket plates is wider than a multi-strand sprocket, and allows two separate strands of chain to engage without contacting each other. With this type of sprocket, one strand of chain may exit in a different direction than the other. For example, one strand exiting towards the ceiling and the other running parallel to the floor.
P
P
Measuring British Standard Chain
QD ® sprocket
12. 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.
Double Single Sprocket
16. Idler Sprockets: This type of sprocket is used in applications where the drive chain may experience slack due to long lengths, non-adjustability of the driven shaft, or where the chain has to be guided around an obstruction. Use of Idler Sprockets prevents chain whipping and uneven distribution of load. This type of sprocket can also be used in applications where the drive chain may experience direction reversal, or in applications where the chain may experience whipping. Having idler sprockets touching the outside of the chain would be beneficial.
TAPER-LOCK ® sprocket
13. 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.
Idler Sprocket
Steel Split sprocket
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