PV-belts technical handbook
46Pages

TECHNICAL HANDBOOK

INDEX Megadyne PV-Belts introduction Megadyne Rollpower TM introduction Belt cross sections and dimensions Pulleys & Idlers PV standard belt range Rubber Standard belt range PU Standard belt range Megadyne Rollpower™ range Symbols, units, terms Drive calculation procedure Table 8: Performance parameters PH - rubber Table 9: Performance parameters PJ - rubber Table 10: Performance parameters PK Table 11: Performance parameters PL Table 12: Performance parameters PM Table 13: Performance parameters PH - polyurethane Table 14: Performance parameters PTB2 Table 15: Performance parameters PJ -...

MEGADYNE PV-BELTS INTRODUCTION MEGADYNE PV-BELTS HAVE BEEN USED FOR DECADES IN THE MOST DIFFERENT INDUSTRIES AND APPLICATIONS, GIVING DRIVE SOLUTIONS TO CUSTOMERS ALL OVER THE WORLD. Megadyne PV-ribbed belts are endless rubber or polyurethane belts with longitudinal V shaped grooves. They transmit the motor power by friction from the driver to the driven side of the machine. PV-Belts provide high flexibility and great power performance as they combine the benefits of Flat and V-belts. PV-belts are also available in elastic version for applications with fixed centre distance, made of...

MEGADYNE ROLLPOWER TM INTRODUCTION MEGADYNE ROLLPOWER™ IS THE NEW ELASTIC RIBBED RUBBER BELT DESIGNED TO OUTPERFORM OTHER BELT TYPES FOUND ON ROLLER CONVEYORS USED IN WAREHOUSING AND MANUFACTURING ENVIRONMENTS. Typical areas of use include receiving lines, order picking, sortation, transfers, and diverters. Relevant for the Logistics and Material Handling sectors, Megadyne Rollpower™ is also used in applications for Airport, Household Appliances and Fitness markets. Stable tension over time Smooth, reliable, and quiet running Long belt life due to superior wear, and abrasion resistance Fast...

BELT CROSS SECTIONS AND DIMENSIONS PV-belts are divided in six different profiles to cover the needs of a wide range of applications. The dimensions and properties of each profile, are summarised in the following table: GHII GRXW D p: The pitch diameter is used to calculate the transmission ratio and the belt speed. D eff: For grooved pulleys, the effective diameter is equal to the outside diameter. D out: Depending if the pulley is flat or grooved the value h or hr have to be added in order to calculate the pitch diameter of the pulleys. TABLE 1 - BASIC DESIGN DATA MATERIAL BELT DIMENSIONS...

PULLEYS & IDLERS BASIC PULLEY DATA To provide the best working conditions, it is recommended to use steel, cast iron or anodised aluminium pulleys. The use of other materials will reduce the transmission efficiency due to loss of friction. All pulleys should be manufactured according to ISO 9982 with a surface finish of Ra = 1.6 [μm]. and have to be dynamically balanced. TABLE 3 - BASIC PULLEY DATA PH Idlers simplify the assembly and disassembly of belts. They have to be used on the slack side of the transmission and may be installed in the inside or the outside part of the drive. In order...

RUBBER PV-BELT RANGE TABLE 6A - STANDARD BELT LENGTH For measuring method and belt length tolerance please refer to ISO 9982.

RUBBER PV-BELT RANGE TABLE 6A - STANDARD BELT LENGTH EFFECTIVE LENGTH PV-BELTS megadynegroup.com

POLYURETHANE PV BELT RANGE STANDARD LENGTH STANDARD LENGTH STANDARD LENGTH TABLE 6A - STANDARD BELT LENGTH

ROLLPOWERTM BELT RANGE TABLE 6A - STANDARD BELT LENGTH ROLLPOWERTM BELTS STANDARD ELASTIC BELTS BELT CODE LENGTH (inches) BELT CODE LENGTH (inches) PV-BELTS megadynegroup.com

SYMBOLS, UNITS, TERMS ARC OF CONTACT ON THE SMALL PULLEY POWER CORRECTION FACTOR FOR BELT LENGTH POWER CORRECTION FACTOR FOR ARC OF CONTACT EFFECTIVE DIAMETER OF SMALL PULLEY EFFECTIVE DIAMETER OF LARGE PULLEY OUTSIDE DIAMETER OF SMALL PULLEY OUTSIDE DIAMETER OF LARGE PULLEY PITCH DIAMETER OF SMALL PULLEY PITCH DIAMETER OF LARGE PULLEY LOAD ON THE FIRST BEARING LOAD ON THE SECOND BEARING DYNAMIC FORCE SERVICE FACTOR DYNAMIC SHAFT LOAD SPEED RATIO CENTRE DISTANCE STANDARD CENTRE DISTANCE BEARING/ PULLEY DISTANCE BEARINGS DISTANCE EFFECTIVE BELT LENGTH PITCH BELT LENGTH BELT STANDARD LENGTH...

DRIVE CALCULATION PROCEDURE DESIGN CRITERIAS To evaluate a drive and to select the correct PV-belts cross section, the following parameters must be known: 1. 2. 3. 4. 5. 6. 7. Type or part of the machine where the belt will be installed. Drive working conditions. Type of motor and its nominal power. Revolutions of the driver pulley. Requested revolutions of the driven pulley. Pulley dimension or required drive ratio. Approximate centre distance. Once all required data is known, follow the method as shown on the next pages. It explains the drive calculation procedure taking in consideration...

DRIVE CALCULATION PROCEDURE DESIGN CRITERIAS TABLE 7 - DETERMINATION OF THE SERVICE FACTOR SERVICE FACTOR CLASS A AC Motor: Asynchronous, Synchronous, Normal Torque DC Motor: Shunt wound Internal combustion engines: Multicylinders speed > 700 rpm AC Motor: Vector control, Reluctance Motor, High Torque DC Motor: Compound wound Internal combustion engines: Turbines speed < 700 rpm Duty cycle category Intermittent service Normal service Continuous service Normal service Continuous service Category 1: LIGHT DUTY DRIVES Blowers, Vacuum cleaners, Magnetic agitators, Domestic gadgets, Fans and...

DRIVE CALCULATION PROCEDURE GRAPHIC DESIGN POWER VS. RPM REVOLUTIONS ON SMALL PULLEY MOTOR POWER REVOLUTIONS ON SMALL PULLEY MOTOR POWER PV-BELTS megadynegroup.com

DRIVE CALCULATION PROCEDURE COMMENT DATA/ FORMULA STEP 3. CALCULATE SPEED RATIO AND EFFECTIVE DIAMETERS. STEP 3A. Determine the speed ratio. Determine the small pulley pitch diameter. Calculate the large pulley pitch diameter. In this case Grooved pulley!! STEP 3D. Calculate the large pulley outside diameter. If flat pulley, use: Dout Dp < 2 u h STEP 4. CALCULATE THE LINEAR SPEED OF THE BELT. STEP 4A. Calculate the linear speed. STEP 4B. Check if the result matches the requirements. Compare the resulting linear speed to the one defined for each profile. v = 8.61 [m/s]< 50 [m/s] Belt section...