As standard, V-belt pulleys (also known as belt pulleys) are available in undrilled, pre-drilled or clamping bush variants. The clamping bush variant is equipped as standard with a conical bore and threaded holes to fasten the bush to the shaft. The undrilled and pre-drilled variants must first be provided with a bore hole and possibly with a keyway and a threaded hole.
The most common types of pre-drilled V-belt pulleys are SPZ, SPA, SPB and SPC. In addition to these types, other V-belt pulley profiles are also available.
V-belt pulleys are mostly made of cast iron (GG) and steel, and are available for special applications in other materials such as aluminium, plastic or stainless steel. If the ambient conditions of the drive require, it is of course also possible to deploy pulleys with an additional surface treatment. Furthermore, we supply V-belt pulleys to match customer specifications, and in our turning shop we can machine standard pulleys according to customer requests or designs.
Depending on the power to be transmitted, several belts can run parallel on one V-belt drive. Therefore V-belt pulleys are not only available with different pitch circle diameters, but also with multiple grooves. Pulleys with a diameter of more than 125 mm are statically balanced. On request, the pulleys can be supplied with quality class Q 6.3 dynamic balancing. Dynamic balancing is recommended where the rotational speed is over 30 m/s, or where the diameter/width ratio is below 4 in combination with a rotational speed of over 20 m/s.
Several factors determine which V-belt type is best suited to a particular drive. These include the application (what is being driven?), the power to be transferred, the desired speed (acceleration or deceleration) as well as the centre distance of the pulleys and any possible impact loads. 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 V-belt drives include: DIN2211, DIN2217, DIN7867, ISO4183, ISO5290, ISO1940 and ISO9981.