V-Belts and Film Belts
It is commonly known that there are some general types of belts. In addition to flat belts and timing belts, the V-belts and film belts also have many characteristics and applications. V-belts are the basic strength-transmission kind, providing the best combination of traction, operating speed, bearing load, and service life. They are typically endless, with a trapezoidal cross section which runs in a pulley with a V-shaped groove. The wedging action of them in the pulley groove allows them to transmit higher torque at less width and tension than flat ones.
They are far superior to flat belts at small center distances and high reduction ratios. They require larger pulleys than flat belts because of their greater thickness. Several individual belts running on the same pulley in separate grooves are often used when the strength to be transmitted exceeds that of a single belt. These are called multiple-belt drives. When an endless belt does not fit the need, jointed and link v-belts may be employed. A link v-belt is a number of rubberized fabric links held together by metal fasteners. They are length adjustable by disassembling and removing links when needed.
Film belts are often classified as a variety of flat belt, but truly they are a separate kind. They consist of a very thin belt (0.5-15 millimeters or 100-4000 microns) strip of plastic and sometimes rubber. They are generally intended for low-strength (10 hp or 7 kW), high-speed uses, allowing high efficiency (up to 98%) and long life. These are seen in business machines, tape recorders, and other light-duty operations.
All of the different types of belts have their features. They can find their own roles during the applications. Of course, it is also the same to the above mentioned types. Although they nevertheless have many disadvantages, their advantages outweigh their disadvantages. consequently, they nevertheless play a very important part in many industries.