Calculate the design horsepower from the following equation. In all cases the program will automatically calculate the belt s cut length. Have you ever been out in the field or to a customers site only to discover a broken belt. Mptab7i2007r 20 calculation of vbelt tensions and shaft loads mechanical power transmission association 5672 strand court, suite 2, naples, fl 34110. V belts need larger pulleys for their thicker crosssection than flat belts. The links are made of plies of polyester fabric and polyurethane that resist heat, oil, water, and many chemicals. As power transmission experts for over a century, gates is driving your vehicles belt drive with our automotive vbelts for your passenger cars, light duty trucks, and personal vehicles. Technical manual vbelt drives this technical manual contains all important technical information and methods for the design and calculation of drives with optibelt v belts and v grooved pulleys for industrial applications. Tension at a halt after the belt finished operating. Service factors for different kinds of driven machines combined with different types of.
The calculation of the classical vbelt life with different. Belt has been categorized into four types which are. If your fan system has developed a squeak the root cause could be due to the belt wearing out, dirty pulleys, belt is too loose, incorrect belt type, poor belt quality, oil on the belts, a bad bearing in a pulley, worn idler pulley, motor going bad, or belt misalignment. The highest quality belts still lose nearly 50% of installed tension, while lower quality belts lose over 70% of installed tension. If a belt or cable runs around a fixed shaft, friction between the belt and the shaft can cause the efficiency to be low, and the cable can rapidly wear. Optibelt technical manual rubber timing belt drives. Our application technology experts offer you free support service regarding the application of our products and also help. Any v belt s ability to drive pulleys depends on wrapping the belt around a sufficient angle of the pulley to provide grip. Step 2 determine if the vbelt is wrapped or notched style. It has been mentioned that, the calculations for vbelt drives are based on pitch diameter. Just put the information into the calculator below for a quick result.
Do not use a screw driver or other sharp objects when replacing the belt as this might result in damage. In effect, this v belt configuration combines the function of the flat belt and the v belt. Belt conveyors for bulk materials practical calculations. Quantity, availability and prices on b2b chiaravalli dp p.
A new formula which can figure out the life of the vbelt with different reliability is presented, and a calculating example by the new method has been provided. Belt tensioning instructions engineering information. V belt design manual to give attentive consideration to both humanity and nature. It was also specially designed for shock loaded drives. V belt drive advantages efficiency tests of carlisle multiple v belt drives have shown them to be 94 98% efficient. Therefore, to arrive at the inside length, the following relationship is useful. Vbelt drive selection handbook baldor electric company.
Abrasive dust, rust, oil and acids reduce service life. Lp is given by the pulleys pitch diameter d and center distance a in the formula. The exact belt pitch length, in inches, can be found as follows. Besides, the step by step calculation for each calculation performed by using this belt length calculator let the users to know how to perform such calculations manually. V elts ax, x, x type v elts medium and high horsepower applications for industrial single or multiple v elt drives ogged construction allows belt to flex around drive sheave and run cooler than the no cogged standard v elt design. Sep 01, 2001 link type belts are used to make instant v belt replacements these belts can transmit the same horsepower as classic v belts. The insulation characteristics vary depending on the belt type. However, there is still a wide range of tension which a belt will operate satisfactorily. These extra heavyduty v belts are constructed with a treated fabric cover, aramid. Belts are not measured by diameter nor folding the belt in half. All vbelts have a 40 angle between the faces, except the v series aka harvester or wedge belts, which have a 30 angle between the faces.
The intent is to find this proper range for any vbelt drive. Then, to maintain performance, recheck belt tension after 2448 hours. V belt is the rubber belt that drives things such as the alternator, air conditioning compressor, power steering pump and waterpump. A special rubber compound wiht textile fibres oriented across the belt length resists deformation of the belt and provides great wear resistance.
When you install a new set of belts, use the gauge to establish correct tension. Mptab7i2007r 20 calculation of v belt tensions and shaft loads mechanical power transmission association 5672 strand court, suite 2, naples, fl 34110. Where a single v belt is limited to a simple convex shape, it can adequately wrap at most three or possibly four pulleys, so can drive at most three accessories. You can also use our browning belt rule that includes a gauge to help easily identify belt type. Designed for the tension testing of a drive with two or more belts, this pocketsized tool measures v belts from 10 to 170 and up to 35 pounds of tension. Rma standard, are a compromise of all belt types and belt manufacturers. In its simplest form a drive of this type consists of an endless belt fitted tightly over two pulleys driving and driven transmitting motion from the driving to the receiving pulley by. Foreword this foreword is provided for informational purposes only and is not to be construed to be part of any technical specification. How to measure v belts correctly determine my v belt size. V belts also style vbelts, vee belts, or, less commonly, wedge rope solved the slippage and alignment problem. Solution based on power input possible belt type is a or b assumption belt type a, minimum sheave 75mm. For example, a vbelt with a top width of 22 and a depth of 716 is a b belt. Vbelts which allows them to be suitable for multiple transmissions. The disadvantage of the v belt is that, due to the wedging action of the belt and increased bending and windage losses the efficiency of the belt is about 3% lesser than the other type of belts.
The outside of the poly v belt is flat and has several v shaped grooves along the inside. The moulded cog provides high flexibility and a good fit in the pulley grooves as well as a lower operating temperature which extends teh. Most design catalogs provide force and deflection formulas. If the centre distance c is known, belt length or pitch length can be determined as follows. Contact us for information on insulation properties, which vary in belt type. The most common application that results in an overhung load on the shaft is a v belt drive. Applied technology guarantees such a dimensional precision in.
They may be used as a source of motion, to efficiently transmit power, or to track relative movement. K y factor for calculating the force of belt and load flexure over the idlers. How to increase belt life keep sheaves and belts clean. For highpower requirements, two or more v belts can be joined sidebyside in an arrangement called a multi v, running on matching multigroove sheaves. Power transmission the following are the major types of power transmission. In order to find the maximum tension is necessary to calculate the effective tension, that is, the force required to move the conveyor and the load at a constant speed. It is used where low power is required and speed is more. How to calculate belt length if the centre distance c is known, belt length or pitch length can be determined as follows. The inside length of the belt is typically 2 less for a 4l belt, and 112 less for a.
V and flat belt design engineering data v belt suppliers. If the drive being calculated is of the vflat type one v pulley and one flat. How to identify a v belt pulley the easiest way to identify a v belt pulley is by finding the part number or identification components on the pulley its self. This is known as a multiple v belt drive or sometimes a classical v belt drive. If the belt you have is notched add an x to the type. V belt tensioning adjustment can be made using a tensionmeter or other type spring scale, using the following procedure.
Transmission ratio for v belt generator is determined for each driven pulley and idler. Hvac the basics of vbelts micrometl corporations blog. Generally, the shaft distance is between 5 to 10 meters. When the free span of a belt is plucked, tapped, or struck it will vibrate at a frequency known as its natural frequency. The payoff is maximum belt life, reduced downtime and uninterrupted equipment service. Belt length calculator distance between pulleys calculator. You will notice that the inside edge of the belt is wider than the base of the v in a vbelt pulley the belt touches the pulley only on the sides. The speed ratio would be stable if slippage did not occur. Belt conveyors for bulk materials fifth edition chapter 6. Grainger approved engineering tech sheet, keyway formulas. Belt tension checker 5 0 1 0 0 1 5 0 s p a n i n c h e s 0 5 10 15 20 25 30 5 0 10 1 5 0 s p a n i n c h e s 0 5 1 0 5 2 0 2 5 3 0 belt span tensioning v belt drives with a powerdrive tension checker belt tension checker powerdrive instruction sheet read and follow all instructions carefully. Standard bearings in the electric motor will handle the radial load imposed by a v belt drive provided the v belt drive is designed in accordance with see appendix a.
This formula can be solved for center distance instead of belt length as follows. Pdf the calculation of the classical vbelt life with different reliability. The intent is to find this proper range for any v belt drive. This type of drive is used when the power is to be transmitted from one shaft to other which is at a distance. How can i identify the correct vbelt type when the belt. After seating the belts in the groove and adjusting center distance so as to take up slack in the belts, further increase the tension until only a slight bow on the slack side is apparent while the drive is operating under load. Youll learn how to read v belt numbers, to measure a belt and use the belt codes to find an exact match. Link type belts are used to make instant v belt replacements. Vbelt and flat belt design and engineering formulas. If two roll v return idlers are used, increase a i value by 5%. Vbelt pulleys for taper bushes vbelt pulleys for taper bushes 5 spz type taper bushes cad drawings available on our site. In the case of long conveyors or very high belt speed over 1,000 fpm refer to cema member companies for more speci.
Adhere to the following procedure when changing or installing a v belt drive, regardless of the application. A pulle y reduces these effects with rolling contact between the cable and. In a belt drive system, a ratio is used to determine the speed relation between two v belt pulleys. The final measurement is the complete overall width of the pulley. The variety of belt sizes available allows the application of megadyne vbelt in a wide range of drive applications, such as. One or more v belts may be used on a drive, as required, to transmit the horsepower load. The roflex rex narrow v belt is a rawedge type with moulded cog. How to read vbelt numbers automotive belts start with either 4l 12. Belt drives a belt is a looped strip of flexible material, used to mechanically link two or more rotating shafts.
Other than direct coupling, v belt drives are the most common and easiest way of connecting a motor to the load. The selection of a v belt drive for any application should be based on the nature of the load and the type of driving unit. Service factors for different kinds of driven machines combined with different types of driving units are shown in table. With too little tension in a v belt drive, slippage can occur and lead to spin burns, cover wear, overheating of the belt. This manual covers vbelt drives used primarily for power transmission in. When replacing sets of vbelts, here are some very important reminders.
So if you know the distance between the center points of the pulleys, and their diameters, you can calculate the length of belt you need using this formula. For the total design of power transmission belt, we recommend our application designing program for belts, it can be downloaded at. Multi v belts have the advantage of preventing the belts from turning over or getting thrown off the drive even when belt vibration occures. Looking for grainger approved engineering tech sheet, keyway formulas 5dfe9. Electric motor shaft load due to belt loading equations and calculator. The driven machines are representative examples only. Therefore, one should not use feel to judge the correct tension of a belt. This lateral rigidity keeps the belt running in a straight line into the grooves even under violent pulsating or shock loads.
Variety of conveyor belting options to fit all needs including fast delivery belts, application specific belts, and belt splices. Technical manual v belt drives this technical manual contains all important technical information and methods for the design and calculation of drives with optibelt v belts and v grooved pulleys for industrial applications. In general, the drives are in the integralhorsepower class as distiguished from light duty of fractional horsepower drives. Cclassical vbelts for rma mptalassical vbelts for rma. One poly v belt has as much traction power as several traditional v belts working together. The below mathematical formula is used in mechanical engineering to calculate the v or flat belt length required to connect two pulleys for mechanical power transmission. Older methods use a fish scale with a ruler to apply load to the belt and measure its deflection. The v shape of the belt tracks in a mating groove in the pulley or sheave, so that the belt cannot slip off. Sense, vance explains the meaning behind v belt codes. Recommended for all multiple v belt drives exposed to pulsating loads or heavy shock loads.
The new pitch diameter values are equal to the outside diameter of a standard not deep groove or combination groove sheave, since this is judged to be the best approximation of the pitch line location of most belt products manufactured. Belt belts are looped over pulleys belt drive when a belt is used for power transmission it is called a belt drive. This manual covers v belt drives used primarily for power transmission in industrial applications. Use of a different type may cause premature failure, and you mi ght suffer injuries. Use the same type of belts or pulleys as those originally used. Too much tension results in excessive stress on belts, bearings, and shafts. Designed for the tension testing of a drive with two or more belts, this pocketsized tool measures vbelts from 10 to 170 and up to 35 pounds of tension. You take a closer look only to realize that the belt is old and worn and you cant make out a single word on it. Vbelts drives types, characteristic and industrial. Usual belt slip magnitude is 1% 2% what results in s 0,01 0,02. Double v belts double v belts are recommended for serpentine drives where the power must be. If the drive being calculated is of the vflat type one v pulley and one flat pulley it is. Multi v belts are made up of two or more standard v belts connected together at the top of the belts. With reference to a belt drive system, the formula to find rim speed, or belt.
Motor shaft load due to belt loading equations and calculator. V belt tension gauge proper tension is the key to long, efficient, troublefree belt operation. Belt length calculator distance between pulleys calculator belt, unkown length. Gates vbelts are engineered to run maintenancefree to keep your vehicles moving without the need for lubrication or. The number following it is the outside length of the belt in tenths of inches. Design manual v belt cclassical v belts for rma mptalassical v belts for rma mpta mmaxstar wedge v belts for rma mptaaxstar wedge v belts for rma mpta nnarrow v belts for dinarrow v belts for din rma rma. They provide the best combination of traction, speed of movement, load of the bearings, and long service life. However, vbelts are designated with nominal inside length this is easily measurable compared to pitch length. For applications in other pulleys, please contact the optibelt application engineering department. Drive belts optibelt red power 3 high performance wedge belts.
This manual covers three vbelt cross sections and pulley groove sizes designated 3v, 5v and 8v. This will in most cases designate the belt type or series used. Never let belts run against belt guards or other obstructions. This dimensional stability continues also during belt use. V belts are friction devices and depend on tension in the belts to prevent slipping.
Calculation methods conveyor belts content 1 terminology 2 unit goods conveying systems 3 takeup range for loaddependent takeup systems 8 bulk goods conveying systems 9 calculation example unit goods conveying systems 12 conveyor and power transmission belts made of modern synthetics worldwide leaders in technology, quality and service. Vbelts drives types, characteristic and industrial application. Because of the wide variety of belt sizes available, almost any type of drive application can be. The v belt consists of steel wires, base rubber compound, and protective cover. Vbelt application and design considerations within industry. Banded vbelts 70 pluriband useful formulas and conversion table 73. Developed and patented by gates, these hipower ii powerband belts pull like multiple v belts, yet have additional lateral rigidity to eliminate problems caused by whipping belts that turn over or come off the drive.
How to measure vbelt pulleys identifying vbelt pulleys. Design to obtain the full advantages of a sit belt. Industrial v belts vbelt construction, types, by size. Contitech offers a highquality tension testing tool. A pulle y reduces these effects with rolling contact between the cable and the machine, but it must be of sufficient size, typi. V belt application and design considerations engineers edge.
The motor size limits the center distance to at least 550 mm. There are flat belt and v belt used for the power transmission. The most accurate way to measure the circumference of a v belt is with a v belt measuring tool or using a cloth tape measure not a steel tape measure or ruler. V belts are the workhorse within industry, available from virtually every distributor and adaptable to practically any drive. A v belt squealing is usually caused by belt slip, often due to undertensioning. One or more vbelts may be used on a drive, as required, to transmit the horsepower load.
Apart from this the belt does have the tendency to slip at high loads and gets easily damaged during slipping. The belt slip occurs on the driver pulley so the speed of all driven pulleys and idlers is influenced by the same slip. Step 2 determine if the v belt is wrapped or notched style if the belt you have is notched add an x to the type. The article describes on the constructional aspects of vbelts, the types of v belts and their advantages and disadvantages. Belt type vbelt tension calculator mitsuboshi belting. Engineering formulas a ratio is a proportional factor between two similar objects of different sizes. The frequency of vibration is directly related to the tension of the belt, i. If the belt wedges in a v pulley and does not rest on the root diameter, enter the diameter that is defined by the belt s outside edge. Proper vbelt tensioning all belts do not feel the same when properly tensioned due to different materials and tension cables used in their manufacturing processes. The design is best suited for small sheaves and can be operated at high.
336 1376 164 401 649 1103 961 211 766 1144 134 1080 40 1192 962 1452 457 427 749 642 1130 280 1476 395 695 1655 1050 1417 379 1012 201 1147 307 1392 210