As standard, tooth belt pulleys are available in undrilled, pre-drilled or clamping bush variants. The clamping bush variant, also known as a taper or taperlock variant, is always used in combination with the associated clamping bush. The undrilled and pre-drilled variants must first be provided with a bore hole and possibly with a key way and a threaded hole.
The clamping bush variant is equipped as standard with a conical bore and threaded holes for fastening the bush to the shaft. The associated clamping bushes are available with bore holes in various sizes and with a key way in both metric and imperial dimensions. They are supplied together with the appropriate socket head screws. The major advantages with using a clamping bush lie in the fact that the pulley and shaft do not have to be modified beforehand and that mounting and removal are very easy.
The most common tooth belt pulleys are stocked, e.g. the Powergrip HTD, Powergrip GT and Poly Chain GT pulleys, all in standard or clamping bush variants. Metric pulleys (T and AT) and those with imperial profiles (such as MXL, XL, L, H and XH) are mostly available directly from our stock. Depending on the variant and number of teeth, the pulleys use either flanges and/or a hub as standard. Furthermore, we supply tooth belt pulleys to match customer specifications, and we can machine standard pulleys according to customer requests or drawings.
Tooth belt pulleys are generally made of steel, cast iron (GG) or aluminium. Pulleys are also available in other materials such as plastic or stainless steel for specialised applications. Of course, it is also possible to apply a particular surface treatment to the pulleys if the ambient conditions require it.
Several factors determine which toothed belt type is best suited to a particular drive, for example the application (what is being driven?), the power to be transferred, the desired speed (acceleration or deceleration) and the centre-to-centre distance between the pulleys. It is also important to know what ambient conditions are present and whether there are any space limitations (what is the maximum permissible diameter and width of the pulleys?).
Common standards for toothed belt drives are DIN 7721 and ISO 5294. Finally, it is important to consider whether the drive needs to be static-conductive to meet ISO 9563 (ATEX environments).