Belt identification and selection v belt and synchronous belt installation proper tensioning sheave and sprocket alignment improving drive performance problemsolution guidelines and troubleshooting tools total productive maintenance tpm gates belts are designed around advanced tpm principles to help customers minimize inventory. It is advisable to use a custom designed belt tension testing device for accurate and. Tensioning tension should be applied guidelines listed. V belt tensioning adjustment can be made using a tensionmeter or other type spring scale, using the following procedure. Technical manual rubber timing belt drives optibelt. The balance should read 11 lb 5 kg for a used belt, lb 6 kg for new belt. The belt can break due to a number of reasons, but the most common is age. Engine timing systems utilize one or more of following components. After tensioning and alignmentstart the machine, and s after a running period of 48 hours the tension on the new belts should be rechecked and if necessary retightened to correct any mid span deflection that exceeds the tension specification. When a belt is installed with a snug but not overly tight fit, longer belt life, less bearing wear and more quiet.
Adjust the camshaft belt tension the belt with the help of an m6 screw. There is no slippage or creep as with plain flat belts. If you require the ability to apply pretension, then tensioning clamps are available in six different types including standard, interchangeable and high load. On drives using a low installation tension, small pulleys, and light loads, the backlash of the. Pull the spring balance until the edge of the belt is in line with a raised mark on the waterpump intakehose stub. To store the belt parameters to a key, the belt span and mass parameters must first be entered and then immediately after release of either the span or mass. If the tensioner is bad, it can cause the belt to come loose or cause the pulley to seize, making the belt come off. Clamps and tensioning clamps clamps are used to attach the ends of an openended timing belt. B 204 b timing belt manufacturer pulley manufacturer. If there is damage to a timing belt, gates recommends that these parts be changed as well. Correct v belt tensioning is the single most important factor necessary for long, satisfactory operation. The guidelines for the new belt installation tension and retension amounts are given below.
Includes a warranty equal to the oe replacement interval. Gates timing belts must be installed, tensioned and maintained according to the vehicle. Simplified procedure for tensioning standard 2pulley timing belt drives with a compression tensioning pencil or. Timing belt tensioning treadclimber in case the tension on the timing belts is too loose or tight, please follow these instructions.
Apply force at right angles to the center of the span see diagram below. Com i r 1 2 3 4 5 6 7 8 9 10 11 12 t 14 15 a timing belts, pulleys, chains and sprockets handbook of. Replacement intervals are recommendations only and are based on average vehicle operations under normal. For maximum safety, when the timing belt is replaced. Apply the appropriate belt tension as specified in the relevant catalog and design documents. The world leader in polyurethane timing belts product. Timing belt driven water pumps should always be replaced. Belts and components the product range continental industry. A belt malfunction can cause the pistons to strike the valves and result in catastrophic engine failure.
Belt tensioning instructions timing belt htb, standard and metric timing belts should be installed to fit pulleys snugly, neither too tight nor too loose. Skf belt frequency meter user manual industrial gp ro. Do not cut a belt while tension is applied, otherwise the belt may burst out and cause personal injury. Position large oring on the tester scale at this measured length. Our engineers and product experts ensure every tensioner we manufacture is built to rigid tolerances and specifications that guarantee fit, form and function for your application.
Forcedeflection and sonic testing meters are 2 ways to correct this. How to check a faulty timing belt tensioner yourmechanic. A predetermined force is applied to the open span of the belt drive fig. They are equally suited to drives with high duty cycles or stopstart applications up to a maximum 10,000 rpm. How to fit the timing belt tensioner, how to tense the. To prevent timing belt failure, refer to the vehicles owners manual for recommended change intervals. Downloadableprintable timing belt identification and replacement.
Observe proper guidelines if your belts have match numbers. To adjust tension using the plunger method, youll need a spring. Despite the break in the tension cords at the finger spliced joint, the welded timing belts still achieve at least 50 % of the permissible tractive force achieved by belts with. Published standards standards under development withdrawn standards projects deleted. This static electric charge can be considerable and may increase the danger of ignition at the moment of discharge. Loose timing belt tensioning acts like a looselyheld piece of string, with a snapping action as in a high torque situation the string or timing belt will break because the added stress is more than the timing belt was designed to take. Place the large end of the tester on one belt, at the center of the span. Check belt tension to assure it falls between the maxi. The timing belt most vehicles on the road today are equipped with a toothed timing belt. Gates tpu belting is the leading manufacturer of innovative thermoplastic polyurethane power transmission and conveyor belts. These combined energy losses affecting belt efficiency will be released in the form of heat the belt will run hotter on the drive. Classical typesuper torquemegatorque timing belt design manualp217. For applications in other pulleys, please contact the optibelt application engineering department.
The teeth on a timing belt are responsible for the intermeshing action that occurs when a timing belt and pulley are engaged. Serpentine drives with multiple pulleys and drives with large pulleys are particularly vulnerable to belt tensioning problems resulting from the belt teeth being only partially. The minimum pulley diameters recommended for standard v belts are shown in table 3. Gates timing belts provide quiet, reliable, low maintenance performance, with a superior resistance to contamination, heat, and wear. Place the belt so that the mark is opposite the marks on the crankshaft and camshaft gear. Prying a belt damages cables in the belt, leading to early belt failure. Using these methods you can quickly, easily and accurately measure the belt tension and identify if adjustments need to be made. Timing belts break most often at startup and shutdown of the engine when the maximum amount of tension is placed on the belt. Handbook of timing belts, pulleys, chains and sprockets. The belts positive grip eliminates the need for high initial tension. Today, one out of every five passenger cars and light trucks use a timing belt to transmit power from the crankshaft to the camshafts. Gemex belt tensioning systems are available in standard models for belt drives from 1 kw up to 500kw. Timing belt drive and basic tribomechanical systems 1 2.
Features made to rma, mpta, and iso standards standard bore sizes include inch, metric. The factoryrecommended replacement interval for the timing belt is 60,000 miles, but more conservative. Habasync teeth are homogeneously formed through extrusion. Belt tensioning instructions jason industrial, inc. The most common method for drive tensioning is force deflection. Tools required phillips screw driver 6mm allen wrench 1. Required belt tension is low, therefore producing very small bearing loads. With a full line of over 500 tensioners globally, you can count on gates to supply premium quality belt tensioners for your power transmission system. The memory keys allow up to 3 sets of belt parameters to be stored in the meter registry. Abrasion resistant white tpu with 92 shore a yields good oil and chemical resistance.
The belt s positive grip eliminates the need for high initial tension. Timing belt information during the belt installation process, it is very important that the belt be fully seated in the pulley grooves before applying final tension. There are two general procedures for determining proper belt tension. Center distance and belt length the relation between center distance and length is given by the following formula. They mesh with matching pulleys to yield accurate positioning of the belt, allowing the component or product being conveyed to be in the right place. Incorrect belt tension methods quickly deteriorate the reliability and efficiency of pulley belt driven systems. The value of the static electric charge is dependent on the materials used for the timing belt, synchronous pulleys, tension rollers andor support rollers. Gates engineers automotive timing belts in partnership with dozens of top automotive oems around the world, and bring the same quality, durability, and oe fit to our aftermarket solutions. Optibelt technical manual rubber timing belt drives. Endless timing belts are supplied in standard lengths see.
Deflecting the belt midspan to predetermined distance and confirming proper deflection force. Characteristically, these drives employ the positive engagement of two sets of meshing teeth. Remove all shrouds underneath the treadles to gain free access to the cable system. Tensioners and idlers are important components that work handinhand with the timing belt. How to use the belt tension tool use these steps to measure timing belt tension. Timing belts are basically flat belts with a series of evenly spaced teeth on the inside circumference, thereby combining the advantages of the flat belt with the positive grip features of chains and gears. The belt and the pulley may be extremely hot after the operation.
How to fit the timing belt tensioner, how to tense the belt 1. A practical guide to pulley alignment plant services. Hutchinson develops and manufactures complete power transmission system incorporating ribbed belts for hvac, conveying, industrial motors, agriculture and energy supply markets to meet all the expectations of the market, hutchinson has expanded its product portfolio with a range of hutchinson v belts, timing belts and pulleys. A toothed belt tension warning system, which can give early warning of a belt problem, was added in my 1985.
Pdf pages of our catalog view or download product sections or the complete catalog. Water pumps are designed and built for long lasting, efficient cooling. Fit the camshaft belt check that the lock pin is in place. Belt pitch is the distance in millimetres between two adjacent tooth centres as measured on the pitch line of the belt. Quickly, easily, and accurately design industrial synchronous or vbelt drive systems that fit your specific design parameters, so you can determine every potential belt drive solution for your specific application without wasting any time or money. Belt tension is the single most important factor in ensuring long life of v belts, pulleys and supporting bearings. Download catalog medium and heavy duty truck water pumps 20 catalog. Correct alignment and belt tension gives your belts, pulleys, and bearings longer and more consistent life, while also providing the conditions for maximum efficiency. Proper belt tension is a critical step when installing a belt. The world of timing belts section 1 introduction timing belts are parts of synchronous drives which represent an important category of drives. Belt pretension initial tension, ti, is the tension set by an adjustable idler pulley. How to check a faulty timing belt tensioner yourmechanic advice. This covers the standard procedure for each type of the various tension tools now available, to suit all v belt types.
Check that the belt is fitted correctly remove the special tool. Belt life varies greatly depending on not only how the belt is installed, but on how the belt is tensioned at installation. Our stateofart pulley manufacture line allows for very precise machining standards. Quick guidelines for determining belt tension on standard. If not, please use a hydraulic jack large enough for the load, and work on a hard, flat, stable surface. Doublesided timing belts for drives with reversible speed can be delivered. Fit the hook to the belt midway between the camshaft and crankshaft sprockets, at the level of the waterpump intakehose stub.
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. Pretension prevents belt slackside sagging and ensures proper tooth meshing. Timing belt pulleys are also available in 3mm, 5mm, 8mm, htd pitch, 15 pitch, and 38 pitch. The timing belt is a critical component which controls the opening of the valves by the cam shaft while precisely synchronising the engine timing. All gates polyurethane belts are made out of abrasionresistant polyurethane that provides thermoplastic flexibility, and longlasting, energy efficient belt system solutions for even the most demanding. Bando vbelttiming belt installations all world machinery. Belt drives vribbed belts, joined vbelts and vbelts including wide section belts and hexagonal belts electrical conductivity of antistatic belts. Make sure the belt is properly set into the pulley groove before use.
The timing belt is a critical part of the automotive engine. Slide the small oring flush with the barrel of the tester. Includes new construction serpentine belt, tensioner, timing belt, timing belt tensioner idlers, water pump and oil seals. The application dictates the precision of registration needed, torque carrying capabilities, antiratcheting characteristics, and also quietness of the drive system. If the deflection is too small, drive tension is excessive, and must be reduced. Robin kent, in energy management in plastics processing third edition, 2018. When tensioning new drive belts, it is important to tension the belt to a specified tension, then after 3 to 5 minutes of engine runin, retension the belt to compensate for the loss of tension due to the belt seating into the pulleys. While a taut string or timing belt can stand a strong pull. Timing belt replacement interval guide gates corporation. Power transmission belt drive system installation, maintenance. Rolling causes low belt tension resulting in low belt life due to slip and heat build up. Timing belt driven water pumps should always be replaced when the timing belt is replaced. The perfect meshing of timing belt and pulley teeth is crucial for satisfactory performance and long service life of any belt drive. These numbers indicate a standard trade size and will help in identifying the specifics of the cog belt.
The proper way to check belt tension is to use a tension tester. This formula can be solved for center distance instead of belt length as follows. Improper application of a belt may cause its premature failure or personal injury. Belt tensioning instructions engineering information. The browning belt tension checker, shown at left, is ideal for this procedure. Timing pulleys and belts mxl xl, l, h for general use are compliant with jis and iso standards. Pressing the mem 1 key recalls the first set of belt parameters and likewise for mem 2 and mem 3. If the timing belt is changed on schedule, theres little risk of a problem. Check the tension at least twice during the first day.
Speed losses are the result of slip and belt creep. Replacing the timing belt is within the capabilities of a competent diy do it yourself owner, but access to the shop manuals and some special tools are required. Use special tools 999 5434 and 999 5435 correct tension. Measure the vibration frequency of the belt using the btm. Modifications can be quickly made when your design calls for a non standard item. Cogged belts have a greatly reduced bending resistance compared to standard v belts and can be used on the same pulleys as equivalent v belts. Conveyor belts, systems and related products catalogs.
The timing belt tooth profile describes the shape of the tooth that is designed specifically for the type of application on which the timing belt pulley will be used. Synchronous drives are especially wellsuited for lowspeed, hightorque applications. This covers the standard procedure for each type of the various tension tools now available, to suit all vbelt types. Endless timing belts for high power applications brecoflex timing belts with endlessly wound tension members are recommended for all high power drive applications. Skf belt tensioner pulleys for timing system are based on stateoftheart technology. Timing belt theory synchropower polyurethane belting. Hence, they do not slip and there is no relative motion between the two elements in mesh. Avoid engine damage with the gates timing belt replacement interval guide, a guide for replacing your timing belt based on your specific belt manufacturer and model. If this is not possible, the timing belt must be installed together with one or both of the timing belt pulleys. All gates polyurethane belts are made out of abrasionresistant polyurethane that provides thermoplastic flexibility, and longlasting, energy efficient belt system solutions for even the mos. Installation with the use of the force is not permissable at any time. Pull down on the gage until the calculated deflection is reached and observe the scale reading. The smaller the pulley diameter, the less the belt life.
Timing belt pdf 8,738kb v belt jis pdf 9,089kb v belt rma pdf 8,599kb v belt din pdf 5,829kb catalogs. The schwaben timing belt tensioning tool uses a micrometerstyle adjustment and springloaded tensioner barrel with sliding scale to measure cam belt tension accurately. Kit reduces overall labor time and expense when repairing accessory or timing belt systems. Megatorque exg ii pdf 885kb gigatorque gx pdf 2,331kb smart tension pdf 542kb page top.
Conti synchroflexpolyurethane timing belts overall. May 06, 2016 there are 2 main methods for adjusting belt tensioning in a system. The efficiency of standard v belts will decrease over time from a peak of 9598% to less than 93% due to ageing and failure to adjust the belt tension. For manual calculation of accurate tensions for each drive, please see appendix vi calculating belt tension. Htb, standard and metric timing belts should be installed to fit pulleys snugly, neither too tight nor too loose. Gates recognizes that drive maintenance can, perhaps more than any other single source, affect belt efficiency, thus energy losses. The years of experience accumulated by skf in the design and supply of belt tensioner pulleys to the worlds automotive manufacturers provides assurance of high quality and performance of each belt tensioner unit included in the skf product range. Belt id chart, single belts, synchronous belts, powerband joined belts, round belts, longlength belting keywords. Standard timing belts habasync standard timing belts offer reliable conveying and linear movement with their trapezoid or curvilinear tooth shapes in metric and imperial pitches. Our timing component kits with water pump offer the same oe components as our tcks with the addition of a water pump. The timing belt is widely used by car manufacturers because of its advantages over chain, namely reduced space, as well as lighter and quieter running. The force f you apply should be what is shown in the table. The tooth engagements occur based on involute motion that closely assimilates the profiles of both teeth, thus minimizing backlash and making the scheme.
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