V-belts
130Pages

TECHNICAL HANDBOOK

INDEX Introduction to V-belts Product range Technical calculation Belt selection charts Calculation example Length measuring and groove pulleys Storage maintenance and useful advices Belt installation Belt data Classical wrapped belts Extra - Oleostatic - Oleostatic Gold Narrow wrapped V-belts DIN Extra - Oleostatic Gold Narrow wrapped V-belts RMA Oleostatic Classical raw edge V-belts Linea Gold Narrow raw edge V-belts DIN Linea X, Linea Gold Variable speed V-belts Varisect Double V-belts Esaflex X-tra duty V-belts XDV2 Banded V-belts Pluriband Useful formulas and conversion table Data...

INTRODUCTION TO V-BELTS Megadyne V-belts have been used for decades in the most different industries and applications, offering drive solutions to customers all over the world. Applied technology guarantees such a dimensional precision in V-belts which allows them to be suitable for multiple transmissions. This dimensional stability continues also during belt use. The variety of belt sizes available allows the application of Megadyne V-belt in a wide range of drive applications, such as: • • • • • • Machine tools Industrial washing machines Textile machines Continuous paper machines High...

INTRODUCTION TO V-BELTS WRAPPED V-BELTS EXTRA Extra belts were designed to offer durable and reliable performances on light and medium-duty drives. They represent an affordable solution for transmission systems of all industrial sectors. OLEOSTATIC Oleostatic rubber belts are developed with high resistant tensile elements, they are characterised by high performances, length stability during belts life, conductivity, oil and heat resistance. They are particularly suitable for centrifugal pumps, compressor, tool machines, generators, high power mills and stone mills. OLEOSTATIC GOLD Different...

INTRODUCTION TO V-BELTS RAW EDGE V-BELTS LINEA X These belts have been specifically developed to run where small pulleys diameters and high transmission ratios put a limit to the use of wrapped belts of the same section. Compared to wrapped belts, the Linea X family offers important improvements, like specific compounds and special production technology. In particular the transverse orientation of the fibers improves the cord support capacity of the body section and reinforces its transverse rigidity, while maintaining, (due to the cogged profile and the precision-ground sidewalls) the...

PRODUCT RANGE CLASSICAL WRAPPED V-BELTS CLASSICAL RAW EDGE V-BELTS (Extra - Oleostatic - Oleostatic Gold) (Linea Gold) NARROW WRAPPED V-BELTS DIN NARROW RAW EDGE V-BELTS DIN (Extra - Oleostatic Gold) (Linea X - Linea Gold) NARROW WRAPPED V-BELTS RMA (Oleostatic) SECTIONS 3V 5V 8V V-BELTS megadynegroup.com

PRODUCT RANGE VARIABLE SPEED V-BELTS XTRA DUTY V-BELTS DOUBLE V-BELTS BANDED V-BELTS (Pluriband) SECTIONS

TECHNICAL CALCULATION pitch diameter of smaller pulley pitch diameter of bigger pulley theoretical center distance effective center distance transmission ratio calculated pitch length external length (Lp+∆e) internal length (Lp-∆i) pitch length (effective) speed of smaller pulley (faster) speed of bigger pulley (slower) actual power of the transmission basic performance of a single belt corrected power difference to Pb due to K≠1 number of belts static belt tension peripheral belt speed V-BELTS megadynegro

TECHNICAL CALCULATION BELT SECTION Necessary data for selection of the belt section: P speed in RPM of the smaller pulley speed in RPM of the bigger pulley It is necessary to correct the power P by a coefficient Cc (see table 1 page 6) which considers into account the actual operating conditions. Corrected power Pc is given by: Pc = P • Cc The graphs gives a guiding criterion for the section of the belt. TRANSMISSION RATIO Transmission ratio is calculated as follows: i= where D is the pitch diameter of larger pulley and d is the pitch diameter of the smaller pulley. Peripheral speed of the...

TECHNICAL CALCULATION PITCH LENGTH OF THE BELT AND CORRECT CENTER DISTANCE Whenever the shaft center distance I is not predetermined by the layout of the drive, the optimum distance may be chosen as follows: 13 The pitch length is determined by: L’~– =2 • I+1,57 • (D+d)+ From the list of belt sizes, should be selected the belt pitch lenght L p nearest to the value of L’ above calculated. Since L’ ≠ L p the center distance “I” may be varied by subtracting half L’ - Lp. Therefore the effective center distance of the drive will be: Ie = I - NUMBER OF BELTS The basic performance P b is the...

TECHNICAL CALCULATION Table 2 (bottom of this page) and 3 (see belt family pages) give values of the coefficients C γ and C L taking into account the operating conditions. The arc of contact g of the belt on the smaller pulley is determined by: γ = 180° - 57 The number of belts Q necessary for the transmission of the power P c is determined by: Q= The number of belts actually is obtained in general by rounding up Q to the next highest whole number. TABLE 1 - TYPE OF MOTOR Daily operating hours Light use Centrifugal pumps and compressors, belt conveyors, (light materials) fans and pumps up...

BELT SELECTION CHARTS 1000 CLASSICAL WRAPPED V-BELTS OLEOSTATIC GOLD V-BELTS megadynegroup.com

BELT SELECTION CHARTS 2000 NARROW WRAPPED V-BELTS DIN 200 OLEOSTATIC GOLD NARROW WRAPPED V-BELTS RMA OLEOSTATIC 10000

BELT SELECTION CHARTS RAW EDGE V-BELTS CLASSICAL RAW EDGE V-BELTS LINEA GOLD NARROW RAW EDGE V-BELTS DIN LINEA X LINEA GOLD V-BELTS megadynegroup.com

CALCULATION EXAMPLE BELT SELECTION From selection charts, for P c = 28,6 and n 1 = 1200 RPM it is appropriate to choose section B. TRANSMISSION RATIO The transmission ratio can be calculated as follows: i= Considering diameter d = 250 mm for the smaller pulley, the pitch diameter of the larger pulley is: D = i • d = 1,82 • 250 = 455 mm Peripheral speed of the belts is determined by v= EXAMPLE P = 22 kW n 1 = 1200 RPM n 2 = 660 RPM BELT PITCH LENGTH AND CORRECT CENTER DISTANCE For i = 1,82 (i.e. 1 < i < 3) the center distance is given by: (i+1) • d +d 4 Textile machine operating time: 12...