SAE J 1596-1989 Automotive V-Ribbed Belt Drives and Test Methods Recommended Practice.pdf

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1、SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirelyvoluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefro

2、m, is the sole responsibility of the user.”SAE reviews each technical report at least every five years at which time it may be reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions.QUESTIONS REGARDING THIS DOCUMENT: (724) 772-8512 FAX: (724) 776-0243TO PLACE A DOCUMENT

3、 ORDER; (724) 776-4970 FAX: (724) 776-0790SAE WEB ADDRESS http:/www.sae.orgCopyright 1989 Society of Automotive Engineers, Inc.All rights reserved. Printed in U.S.A.SURFACEVEHICLE400 Commonwealth Drive, Warrendale, PA 15096-0001RECOMMENDEDPRACTICESubmitted for recognition as an American National Sta

4、ndardJ1596ISSUEDJUN89Issued 1989-06AUTOMOTIVE V-RIBBED BELT DRIVES AND TEST METHODSForewordThis Document has not changed other than to put it into the new SAE Technical Standards BoardFormat.1. ScopeThe following information covers engine accessory drive layout details and testing methods andinclude

5、s test configurations, pulley diameters, power loads, and guidance for interpreting test data. Thisinformation has been prepared from existing literature, including standards and data supplied by bothproducers and users of V-ribbed belts.When the engine is used to drive an external unit equipped wit

6、h industrial type V-pulleys and belts, it isrecommended that the power takeoff pulley on the engine be grooved according to the appropriate industrialstandard. These standards are published by RMA-MPTA (Rubber Manufacturers Association - MechanicalPower Transmission Association); ISO (International

7、Standards Organization) and ASAE (American Society ofAgricultural Engineers). The grooves in those standards differ from each other in the reference dimensions,and they are not interchangeable with SAE grooves, which are standardized for engine accessory drives ascovered in SAE J636 and J1459.1.1 Pu

8、rposeThis recommended practice is intended as a guide to be used for evaluating V-ribbed beltconstruction, source approval, or quality audit.2. References2.1 Applicable PublicationsThe following publications form a part of this specification to the extent specifiedherein. Unless otherwise indicated,

9、 the latest version of SAE publications shall apply.2.1.1 SAE PUBLICATIONSAvailable from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001.SAE J636V-belts and PulleysSAE J1459V-ribbed Belts and Pulleys3. General Drive Layout Considerations3.1 Belt SpeedIt is recommended that the pulley diameter

10、s be as large as possible without exceeding 50 m/sbelt speed.COPYRIGHT Society of Automotive Engineers, Inc.SAE J1596 Issued JUN89-2-3.2 Pulley SizesThe inside pulleys should never be smaller than the tension pulley diameter specified in Tables1 and 2 of this standard; however, belt life is directly

11、 related to pulley diameter. A more practical minimumpulley diameter, for increased belt life, would be 50 mm. (See 3.5 for backside pulley diameterrecommendations.)3.3 Belt LengthThe calculation of the belt effective length (E.L.) for a specific drive involves several designconsiderations, includin

12、g provision for adequate installation and take-up.To allow for belt installation and take-up, one pulley should be adjustable from its initial position with the meanlength belt at installation tension. This formula gives the minimum allowance for easy installation of the beltwithout prying or otherw

13、ise forcing it over the sides of the grooves.3.3.1 The following formula can be used to calculate the recommended minimum belt E.L. for installation:“K“ Section: Inside pulleysMin. Belt E.L.= 1.003(L1)+L2+.77+6.28(h)“K“ Section: Flat backside pulleyMin. Belt E.L. = 1.003(L1)+L2+6.28(h)“L“ Section: I

14、nside pulleysMin. Belt E.L. = 1.005(L1)+L2+1.15+6.28(h)“L“ Section: Flat backside pulleyMin. Belt E.L. = 1.005(L1)+L2+6.28(h)NOTEThe last pulley, over which the belt can be installed, should be considered and the appropriate beltinstallation formula used.L1 - The effective belt length (addition of s

15、pan lengths and effective arc lengths on the pulleys) around thedrive with the tensioning pulley in the minimum position. The 1.003 (“K“ section) and 1.005 (“L“ section)factors provide for length change from slack to measuring tension.L2 - The 2 X negative belt manufacturing center distance toleranc

16、e (Tables 3A and 3B, SAE J1459).h - The flange height.This formula also allows for full contact belt rib height for V-ribbed pulleys - 0.77 (“K“ section) and 1.15 (“L“section).The metric formulas are the same with the following exception:“K“ section - 0.77 value is 20“L“ section - 1.15 value is 29Th

17、e belt length, flange height, and manufacturing tolerance are in inches in the English system andmillimeters in the metric system.3.3.2 Select a belt to be used that has a nominal effective length equal to or greater than the recommendedminimum E.L.SAE J1596 Issued JUN89-3-3.3.3 Calculate the maximu

18、m required effective length path around the drive to provide for take-up:The maximum required belt path length = “K“ section: (1.0145)L3+L4+L5“L“ section: (1.0190)L3+L4+L5L3 - The nominal effective belt length as defined in 3.3.2. The 1.0145 (“K“ section) and 1.0190 (“L“ section)factors account for

19、elongation from measuring to installation tension and 1% for belt stretch and wear.L4 - “K“ section - 0.12“L“ section - 0.19Values for belt seating factorL5 - Positive manufacturing tolerance for belt length. (Tables 3A and 3B SAE J1459.)The formulas are in English units with belt length in inches.

20、The metric units will be belt length in millimetersand the following seating factor changes:“K“ section - 0.12 value is 3.0“L“ section - 0.19 value is 4.83.4 Pulley MisalignmentThe recommended maximum misalignment between pulleys is 0.58 mm per 100 mm(0.069 in/ft) of span length or approximately 0.3

21、3 deg.3.5 Backside PulleysThe application design with backside pulleys is acceptable provided their minimumdiameter is 90 mm (3.54 in) for PK (K) section, and 140 mm (5.5 in) for PL (L) section.4. V-Ribbed Belt Fatigue Test Method4.1 Test ConfigurationThe belt shall be mounted on a test fixture layo

22、ut as shown in Figure 1 with the pulleydiameters and speeds as given in Tables 1 and 2 and the installation clearance factor as shown in Table 3.4.2 Test LoadThe kilowatts (horsepower) to be absorbed at the driven pulley shall be as shown in Tables 1 and2.4.2.1 The driver pulley speed (rpm) shall be

23、 used in the torque load calculation, and the torque load shall be keptconstant without compensation for loss of driven pulley rpm resulting from belt slippage.(Eq. 1)4.2.2 The test equipment shall be maintained to minimize parasitic loads due to bearing losses, lubricants, etc.4.2.3 The belt tensio

24、ning force shall be equal in the number of Newtons to sixty times the number of specifiedkilowatt units (in number of pounds to ten times the number of horsepower units).4.3 TemperatureThe ambient temperature of the test fixture shall be controlled to 80C 3 (175 F 5) within asuitable enclosure.Torqu

25、e, Nm Specified kilowatts9549Driver rpm-Torque, lbfinSpecified horsepower63025Driver rpm-=SAE J1596 Issued JUN89-4-4.4 Test ProcedureThe test procedure shall be as follows:4.4.1 Set the required torque load.4.4.2 Install the belt on the test fixture and apply the required belt tension. Condition the

26、 belt by running it for 5 minwithout the dynomometer load. Maintain a constant tension during this period by operating with the tensionpulley center position unlocked. Stop the machine, allow it to stand for a minimum of 10 min and lock thetension pulley center position midway of the limits of trave

27、l during belt rotation.4.4.3 Start the machine. Adjust the torque to the proper setting. Adjust the temperature to the proper setting.4.4.4 Whenever the slip reaches 8%, stop the machine, allow it to stand for a minimum of 20 min, unlock thetension pulley center, restore the initial tension per 4.2.

28、3 relock, and restart the machine.4.4.5 (Exclusive of the 5 min run-in)Record the number of hours run and the number of re-tensions.5. Test Performance Guidelines5.1 Test LifeThe test life, which a belt must attain, shall be according to agreement between the manufacturerand user.5.2 Acceptable Numb

29、er of Re-tensionsThe acceptable number of re-tensions after the initial 5 min run-in shallbe according to agreement between the manufacturer and user.5.3 Failure CriteriaA belt shall be considered failed when it no longer transmits the specified power because ofbreakage or it exceeds the number of a

30、greed re-tensions. The belt manufacturer and user may agree on otheracceptance/rejection criteria.5.4 Length vs. Life RelationshipGenerally speaking, the belt test life is a function of the belt length. Therelationship shall be according to agreement between the belt manufacturer and user.5.5 Defini

31、tion of Construction SpecificationsThe belt manufacturers test data on belts of a certainconstruction specification shall be considered valid for evaluation of all belts of the same constructionspecification when they are the same with respect to the manufacturers cross section dimensions, materials

32、pecifications, and method of manufacture.5.6 Belt Test LengthsThe test belt range will be: 10201400 mm (4055) in) with recommended length being1200 mm (47.24 in). When evaluating for part source approval and for production quality surveillance, the testdata from one belt length will be representativ

33、e of all belt lengths of the same construction.5.7 Statistical RelationshipsWhether testing is performed for part source approval or for productionsurveillance, a realistic statistical guide to acceptability would be “not more than 10% of the test lives shall bepermitted to fall below 50% of the spe

34、cified average life“.SAE J1596 Issued JUN89-5-FIGURE 1V-RIBBED BELT FATIGUE TESTSAE J1596 Issued JUN89-6-PREPARED BY THE SAE V-BELT COMMITTEETABLE 1TEST CONDITIONS - METRICSAEBeltSizeEffectiveDiameterDriverPulleySpeedrpm2%Load(KW)NumberofRibsBelt Length RangeDriverandDrivenPulleys0.25TensionPulley0.

35、25IdlerPulley0.25Total PreferredPK 120.6 44.45 76.2 4900 10.4 3 10201400 1200PL b b b b b b 10201400 1200a = Groove details per SAE J1459b = Not developed for Automotive beltsTABLE 2TEST CONDITIONS - ENGLISHSAEBeltSizeEffectiveDiameterDriverPulleySpeedrpm2%Load(HP)NumberofRibsBelt Length RangeDriver

36、andDrivenPulleys0.010TensionPulley0.010IdlerPulley0.010Total PreferredK 4.750 1.750 3.000 4900 14 3 40.1755.14 47.26L b b b b b b 40.1755.14 47.26TABLE 3CLEARANCE FACTOR FOR BELT INSTALLATIONSAE BELT SIZE C VALUEMetric English mm inPK K 3.07 0.12PL L 4.52 0.18SAE J1596 Issued JUN89RationaleNot appli

37、cable.Relationship of SAE Standard to ISO StandardNot applicable.ApplicationThe following information covers engine accessory drive layout details and testing methods andincludes test configurations, pulley diameters, power loads, and guidance for interpreting test data. Thisinformation has been prepared from existing literature, including standards and data supplied by bothproducers and users of V-ribbed belts.Reference SectionSAE J636 FEB87V-belts and PulleysSAE J1459 AUG88V-ribbed Belts and PulleysDeveloped by the SAE V-Belt Committee