,. ,t. ~A r TheEngineeringSociety~ ForAdvancingMobility

~ LandSeaAirandSpace@INTERNATIONAL

SURFACEVEHICLESTANDARD

SAEJ1459REV.

AUG1997

400 Commonwealth Drive, Warrendale, PA 15096-0001IssuedRevised

1984-081997-08

Submittedforrecognitionas an AmericanNationalStandardSuperseding J1459 AUG88

(R)V-RibbedBeltsandPulleys CQNTROLLED.

1. Scope-This SAE Standardcoversdimensions,tolerances,and methodsof measurementof V-ribbedbeltsandpulleysforuseonautomotive1drives.

2. References

2.1 Applicable Publications-The followingpublicationformsa partof the specificationto theextentspecifiedherein.-

2.1.1 RMA ENGINEERINGSTANDARDIP-Available from RubberManufacturersAssociation,Inc., 1400K Street,NW,Washington,DC 20005.

RMA EngineeringStandardIP-26

3. V-RibbedBelts-V-ribbed belts are producedin a varietyof cross-sectionalsizes whichare given letterdesignations.It has beendeterminedthatthe"PK" ("K")and "PL" ("L")sectionV-ribbedbeltsareapplicablefor automotiveuse. Because of differentconstructionsand differentmethodsof manufacture,the cross-sectionalshape,dimensions,and includer.lan!J!eDetweenthe sidewallsof the beltmaydifferwithdifferentmanufacturers.Belt~~~:::g-~ dimensionedinsucha waythattheyare functionalin pulleysdimensionedasdc:>cribeaina subsequentsection.

.'

.4. PulleysForV-RibbedBelts-Pulleysaretoconformtorequirementsof Figure1andTables1Aor1B.

1. Fornon-automotivedrives,see RMA EngineeringStandard1P-26. Pulleysproducedto RMA EngineeringStandardIP-26willmeetallof therequirementsof thisstandard.

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 therefrom, 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)772-8512FAX: (724)776-0243TO PLACE A DOCUMENT ORDER; (724)776-4970FAX: (724)776-0790

SAE WEB ADDRESS http://www.sae.org

Copyright 1997 Society of Automotive Engineers, Inc.All rights reserved. Printedin U.S.A.

SAE J1459 Revised AUG1997

T'w'O

a::::w

tS

l

~

~.

4: :::~

Se

END OFPULLEY

ALLOW'ABLE CONFIGURATIONS

(VIEW' A ENLARGED)DrA.OVER BALLS (Db)

IF"t

--1.--:~ roti .\

~F"ULL RADIUS TANG~NT TO GROOVESIDEV ALLS

NOTE. APEX. EF"F"ECTIVE:,8. PITCH DIA.CANNOTPHYSICALLY BE MEASUREDON PULLEY. THEY ARE F"CRREF"ERENCEONLY.

IT IS RECOMMENDEDTHE F"OLLOVINGTABLE BE USED ON THE DRAVING.Db =DIA. OVER BALLS

~ TRUN:~TEDVITH STRAIGHT LINEPARAL~~L TO PULLEY AXIS HAVINGrt CORNER RADII TANGENT TO80T~ T:-iEGROOVESIDEWALL ANDTHE 'TR:..JNCATlON UNE.

. EXAMPLE SHOVNIS F"OR'PK' GROOVE

FOR CALCULATIONPURPOSES ONLYEFFECTIVE DIAMETERPITCH DIAMETERAPEX DIAMETER

Db- 0.99Db+2.01Db- 0.03

FIGURE 1-STANDARDGROOVE DIMENSIONS

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t...t... WW a:::a:::: -U I--I-- U- Wa.. t...

L..W

SAE J1459 Revised AUG1997

TABLE 1A-GROOVE DIMENSIONS-MILLIMETERS

1. Summationof thedeviationsfromSg foranyone beltgrooveset ina pulleyshallnotexceed:to.30mm.2. Ft is measuredfromtheactualridepositionof theballor rodinthepulley.3. This numbermayvarywithbeltmanufacturer.

1. SummationofthedeviationsfromSg foranyone beltgroovesetina pulleyshallnotexceed:to.012in.2. Ft is measuredfromtheactualridepositionof theballor rodin thepulley.3. This numbermayvarywithbeltmanufacturer.

5. V-RibbedBeltSize-Thebeltcross-sectionalsizecanbedeterminedbythebasicdimensionSg' Thebeltwidthforacrosssectionisdeterminedbythenumberofribs.Thebeltlengthisdeterminedbymeasurementas describedin a subsequentsection. Beltsize is designatedby a standardseriesof alphanumericcharacters.Beltsmeasuredona metriclengthsystemaredesignatedbythenumberofribsfollowedbythebeltcross-sectionalsize("PK"or"PL")andtheeffectivelengthinmillimeters.Forexample,6PK1370signifiesa 6-rib"PK"sectionbelt,withaneffectivelengthof 1370mm. Beltsmeasuredonaninch-lengthsystemaredesignatedbytheeffectivelengthtothenearesttenthofaninchfollowedbythebeltcross-sectionalsize("K"orilL")andthenumberofribs.Forexample,540K6signifiesabeltwithaneffectivelengthof54.0inches,a"K"crosssection,and6ribs.

6. V-RibbedPulleySize-Pulleysizeis designatedbytheeffectivediameter,thegroovecross-sectionalsize,andthenumberof grooves.Theeffectivediametercanbedeterminedbymeasuringthediameterovertheballsor rodsandsubtracting2k. The groove-cross-sectionalsizecan be determinedbymeasuringthedimensionSg' Thepulleywidthforacrosssectionisdeterminedbythenumberofgrooves. .

7. MeasurementOfV-RibbedBelts-ThelengthofaV-ribbedbeltisdeterminedbyuseofameasuringfixturecomprisedoftwopulleysofequaldiameter,a methodofapplyingforce,anda meansofmeasuringthecenterdistancebetweenthetwopulleys.Oneofthetwopulleysisfixedinpositionwhiletheotherismovablealongagraduatedscale.Bothpulleysareallowedtorotate.ThefixtureisshownschematicallyinFigure2. Grooves'OfmasterinspectionpulleysshallbemachinedtodimensiontolerancesshowninTables1Aand2A,or1Band2B,treatedtoresistwear,andcheckedperiodicallyforwearanddamage.

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MinimumCross Recommended

Section Effective Sg(1) Se rt rt rb Ft(2) BALLSize Diameter :to.OS Min min max max max 2a 2k 2x(3) ::1:0.010

PK 45 3.56 2.50 0.39 0.50 0.50. 1.00 0.03. 0.99 3.0 2.500

PL 75 4.70 3.30 0.40 0.70 0.40 1.75 0.82 2.36 1.54 3.500

TABLE 1B-GROOVE DIMENSIONS-INCHES

MinimumCross Recommended

Section Effective Sg(1) Se rt rt rb Ft

SAE J1459 RevisedAUG1997

TOTALMEASURING FORCE

1'1'1""'1' ,'I

FIGURE 2-DIAGRAM OF A FIXTURE FOR MEASURING V-RIBBEDBELTS

TABLE 2A-MEASURING CONDITIONS-MILLIMETERS

CrossSection

Size

EffectiveDiameter

(reference)

95.49

159.15

EffectiveCircumference

(reference)

300

500

PK

PL

dBBall or RodDiameter:to.010

2.500

3.500

DiameterOverBall or Rods

:to.10

96.48

161.51

TotalMeasuringForce

Per Rib(N)

100

200

TABLE 2B-MEASURING CONDITIONS-INCHES

CrossSection

Size

EffectiveDiameter

(reference)

3.759

6.266

EffectiveCircumference

(reference)

11.8

19.7

K

L

dgBall or RodDiameter:to.0004

0.09840.1378

DiameterOverBall or Rods

:to.004

3.798

6.359

Total

MeasuringForcePer Rib

(Ib)

22

45

7.1 Length-Tomeasurethe length,thebeltis placedonthemeasuringfixtureatthetotalmeasuringforceshownin Tables2A and2B, and rotatedaroundthe pulleysat leasttwo revolutionsto seatthe beltproperlyin thepulleygroovesandto dividethetotalforceequallybetweenthetwostrandsof thebelt. The midpointof thecenterdistancetravelof the movablepulleydefinesthe centerdistanceand will be measuredthroughaminimumofone revolutionof thebeltafterthetwoseatingrevolutions.The belteffectivelengthis equaltotwotimesthecenterdistanceplusthepulleyeffectivecircumference.StandardbeltcenterdistancetolerancesareshowninTables3Aand3B. Forcenterdistancetoleranceslessthanstandard,thebeltmanufacturershoul

-.~--~

SAE J1459 Revised AUG1997

TABLE 3B-STANDARD BELT CENTER DISTANCETOLERANCES-INCHES

--BeltLength49 andless

Over49- 63,incl-Over0"~-79rincl

Over 79- 98, inclOver 98- 124,inclOver124- 157,incl

ToleranceonCenterDistance

:to.13

:to.16

:to.19

:!;Q,.22_:to.25

:to.28

B. StandardLengths-Standard lengthsup to and including2000 mm (79 in) are to be in 10 mm (0.4 in)increments.Standardlengthsover2000mm(79in)uptoandincluding4000mm(157in)aretobein25mm(1.0in)increments.

NOTE 1-The sidesofthegroovearetobe 3.2f.1m(125f.1in)A.A. maximum............

NOTE2-Radial andaxialrun-outisnottoexceed0.35mm(0.014in)fullindicatormovement(FIM).Run-outinthetwodirectionsismeasuredseparatelywitha ballmountedunderspringpressuretofollowthegrooveasthepulleyisrotated.

NOTE3- Thediametersovertheballgaugesarenotto varyfromgrooveto groovemorethan0.25mm(0.010in)foranyonebeltgroovesetina pulley.

NOTE 4-Centerline ofgr~o bt::-go.Odegrees:I:0.5degreeswithpulleyaxis.-- . ~ diameteris usedforcalculationofspeedratio.The"x"dimensionis radial."2x"istobe-I-- - addedtotheeffectivediametertodeterminethepitchdiameter.

NOTE6- The apexdiametermaybe helpfulfor layoutof pulleygroovesor productiontooling."2a"issubtractedfromthediameterovertheballstodeterminetheapexdiameter.

9. Notes

" " MarginalIndicia-Thechangebar(I) locatedintheleftmarginisfortheconvenienceoftheuserinlocatingareaswheretechnicalrevisionshavebeenmadetothepreviousissueofthereport.An(R)symboltotheleftofthedocumenttitlesindicatesacompleterevisionofthereport.

PREPARED BY THE SAE BELT DRIVE SYSTEMS COMMITTEE

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SAE J1459 Revised AUG1997

Rationale-Not applicable.

Relationshipof SAE Standardto ISO Standard-Not applicable.

Application-This SAE Standardcoversdimensions,tolerances,and methodsof measurementof V-ribbedbeltsandpull~ysforuseonautomotivedrives.

ReferenceSection

RMA EngineeringStandardIP-26 -----Developedby theSAE Belt-DriveSystemsCommittee

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