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Betw een the tension members ( cords) and the rubber cushion. however, notice the diferences in cord materials, body compounds, cov- er configurations, temperature ranges and application requirements. use the following method to determine the v- belt tension. 25 - fa) x hp fa x v t2 : slack side tension ( pounds) fa : arc of contact.
measuring belt tension this article discusses several methods for measuring the belt tension for v- belts commonly chart used in hvac applications. v- belt tensioning for the initial installation of optibelt red power 3 v- belts, the same methods are used as for standard optibelt v- belts. the tension can be seen to drop slowly in this type of belt, with retension requirements from 2 hours to 24 hours. home knowledge center calculators belt tension calculator calculators belt tension calculator proper belt tension ensures optimum performance of a vehicle' s accessory belt drive system. over tensioning shortens belt and bearing life. then, to maintain performance, re- check belt tension after 24- 48 hours. all belts do not feel the same when properly tensioned. most v- belt problems are due to improper tensioning. keep belts free of foreign material which may cause slip.
check tension frequently during the first 24 hours of operation. v- belt tension is a function of two parameters: belt deflection and its force. some feel very rigid and yet are still not properly tensioned. 1 recommended method for calculating and measuring belt static tension based on drive parameters v- belt drives can operate satisfactorily over a wide range of tensions. v- belts operate on friction; the friction is multiplied by the mechanical advantage of the wedging principle. tensioning v- belt drives with a powerdrive tension checker general rules of tensioning ideal tension is the lowest tension at which the belt will not slip under peak load conditions. tension members the tension cords are made from polyester yarn. fa/ a technical bulletin for engineers, contractors and students in the air pdf movement and control industry. calculate deflection see tables below for correct deflection force.
v- belt tensioning adjustment can be made using a tension gauge or other type spring scale, using the following pro- cedure. be sure deflection = belt span. table c – new installations for narrow v belt tension chart pdf v- belts. dayco® engineers recommend speci c guidelines be followed when tensioning new and/ or used drive belts. read up) table a – new installations for classical v- belts. note: the value of t s is for an individual v - belt. tension drop value seen is less than the typical cord elon- gation seen in standard wrapped belts. retension 1 – the drive will need to be stopped, and then set up to reset the tension. calculate the recommended minimum and maximum deflection forces ( p), in pounds: t s + y ( 1. belt id chart belt i.
determine the deflection distance by dividing span length ( t) by 100, e. table b – new installations for narrow v- belts. figure 2: force- deflection method for v- belt tensioning; span length ( a), deflection length ( b), and force or tension caused by the deflection ( c) measure the v- belt span length ( figure 2 labeled a) using tape. when you install a new set of belts, use the gauge to establish correct tension. improperly tensioned belts can cause slippage, squealing, heat build- up, and premature failure. apply tension a- 7 a- 8 all v- belt drives must operate under proper tension to produce the wedging pdf action of the belt against the groove sidewall. proper belt tension is a pdf critical step when installing a belt. when installing new drive belts, it is important to tension the belt to its speci ed tension, then after 3 to 5 minutes of engine “ run- in. select from the dropdown options below to find the appropriate belt tension for your belt. if a banded v - chart belt is used, refer to òelongation method.
correct v- belt tensioning is the single most important factor necessary for long, satisfactory operation. make v- drive inspection on a periodic basis. the tension values are to be calculated on the same basis or to be taken from the table on page 147. the ideal pdf tension is the lowest tension at which the belts will not slip excessively at the highest load condition. the payoff is maximum belt life, reduced downtime and uninterrupted equipment service. chart single v- belts predatortm v- belts 1” 5/ 8” 7/ 8” 21/ 32” v belt tension chart pdf 1/ 2” 5/ 16” 13/ 32” 17/ 32” 7/ 8” 35/ 64” 22mm 16mm 13mm ap bp cp 5vp 8vp aramid tensile cords provide superior service on high impact, shock- loaded drives. t c = add- on tension allowance for centrifugal force, from t able 31 on page 7.
5 x t s) + y p min = 16. the browning® belt tension chart checker, shown at left, is ideal for this procedure. 05 dq tst = – – – – – – – – ms 2 + ( chart lbdd ( for drives with a service factor less than 1. a well- established rule of thumb is that the best tension for a v- belt drive is the least tension at which the drive will not slip under peak load. k : a constant for v- belt design ( 0. 3) pdf where: tst = static tension per span ( lbs) dq = pdf driver design torque ( lb• in) = driver pitch diameter pdf ( in) = belt speed/ 1000 ( ft/ min) where belt speed = ( driver pitch diameter x driver rpm) / 3. rubber cushion the rubber cushion is a fibre loaded giving good transverse belt rigidity. check the tension at least twice during the first day of operation, and periodically thereafter. tensioning procedure measure the span length ( t) in cm.
once correctly tensioned optibelt red power 3 v- belts need no re- tensioning. 82 = mass factor from table 19. application areas some brands of belts feel somewhat spongy even when properly tensioned. take a look at the accompanying chart ( figure 1). check after jog start or 1- 3 minutes of operation, at 8 hours, 24 v belt tension chart pdf hours, 100 hours and periodically thereafter are recommended.
figure # 1: belt static tension 3. spbp v belt tension chart pdf 18mm spcp super hctm & super hc xptm v- belts 1” 1” 5/ 8” 5/ 8” 3/ 8” 3/ 8” 35/ 64” 7/ 8” 35/ 64” 21/ 64” 21/ 64”. pre- loading the cords during their rubber impregnation process results in low stretch during operation. 5123) q : arc of contact ( ° ) tight side tension t1 = 41, 250 x hp fa x v t1 : v belt tension chart pdf tight side tension ( pounds) hp : horsepower ( hp) fa : arc of contact correction factor v : belt speed ( feet per minute) slack side tension t2 = 33, 000 ( 1. large pdf o- ring v- belt tension gauge proper tension is the key to long, eficient, trouble- free belt operation. each of these belts has a 1⁄ 2- inch top width and chart 50- inch circum- ference. apply force at right angles to the center of the span ( see diagram below). basic information critical information on proper tensioning of single and banded v- belt drives 1.
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