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INTERNATIONAL

SURFACEVEHICLESTANDARD

SAEJ1459REV.

AUG1997

400 Commonwealth Drive, Warrendale, PA 15096-0001IssuedRevised

1984-081997-08

Submitted for recognition as an American National StandardSuperseding J1459 AUG88

(R) V-Ribbed Belts and Pulleys CQNTROLLED.

1. Scope-This SAE Standard covers dimensions, tolerances, and methods of measurement of V-ribbed beltsand pulleys for use on automotive 1drives.

2. References

2.1 Applicable Publications-The following publication forms a part of the specification to the extent specifiedherein.-

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

RMA Engineering Standard IP-26

3. V-Ribbed Belts-V-ribbed belts are produced in a variety of cross-sectional sizes which are given letterdesignations. It has been determined that the "PK" ("K") and "PL" ("L") section V-ribbed belts are applicablefor automotive use. Because of different constructions and different methods of manufacture, the cross-sectional shape, dimensions, and includer.l an!J!e Detween the sidewalls of the belt may differ with differentmanufacturers. Belt~ ~~:: :g-~ dimensioned in such a way that they are functional in pulleys dimensioned asdc:>cribea in a subsequent section.

.'

.4. Pulleys For V-RibbedBelts-Pulleys are to conform to requirements of Figure 1 and Tables 1Aor 1B.

1. For non-automotive drives, see RMA Engineering Standard 1P-26. Pulleys produced to RMA Engineering Standard IP-26 willmeet all of therequirements of this standard.

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

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

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

SAE J1459 Revised AUG1997

T'w'O

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tS

l

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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.CANNOT PHYSICALLYBE MEASUREDON PULLEY. THEY ARE F"CRREF"ERENCEONLY.

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

~ TRUN:~TED VITH STRAIGHT LINEPARAL~~L TO PULLEY AXIS HAVINGrt CORNER RADII TANGENT TO80T~ T:-iE GROOVESIDEWALL ANDTHE 'TR:..JNCATlON UNE.

. EXAMPLE SHOVN IS F"OR 'PK' GROOVE

FOR CALCULATION PURPOSES ONLYEFFECTIVE DIAMETERPITCH DIAMETERAPEX DIAMETER

Db- 0.99Db+2.01Db- 0.03

FIGURE 1-STANDARD GROOVE DIMENSIONS

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t...t... WW a:::a:::: <i.-4:- W:I: >-U I--I-- U- Wa.. t...

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SAE J1459 Revised AUG1997

TABLE 1A-GROOVE DIMENSIONS-MILLIMETERS

1. Summation of the deviations from Sg for anyone belt groove set in a pulley shall not exceed :to.30 mm.2. Ft is measured from the actual ride position of the ball or rod in the pulley.3. This number may vary with belt manufacturer.

1. Summation of the deviations from Sg for anyone belt groove set in a pulley shall not exceed :to.012 in.2. Ft is measured from the actual ride position of the ball or rod in the pulley.3. This number may vary with belt manufacturer.

5. V-RibbedBelt Size-The belt cross-sectionalsize can be determinedby the basic dimensionSg' The beltwidth for a cross section is determined by the number of ribs. The belt length is determined by measurementas described in a subsequent section. Belt size is designated by a standard series of alphanumericcharacters. Belts measured on a metric length system are designated by the number of ribs followedby thebelt cross-sectional size ("PK"or "PL")and the effective length in millimeters. For example, 6PK1370 signifiesa 6-rib "PK"section belt, with an effective length of 1370 mm. Belts measured on an inch-length system aredesignated by the effective length to the nearest tenth of an inch followedby the belt cross-sectional size ("K"or ilL") and the number of ribs. For example, 540K6 signifies a belt with an effectivelength of 54.0 inches, a "K"cross section, and 6 ribs.

6. V-Ribbed Pulley Size-Pulley size is designated by the effective diameter, the groove cross-sectional size,and the number of grooves. The effective diameter can be determined by measuring the diameter over theballs or rods and subtracting 2k. The groove-cross-sectional size can be determined by measuring thedimension Sg' The pulleywidthfor a cross section is determined by the number of grooves. .

7. Measurement Of V-RibbedBelts-The lengthof a V-ribbedbelt is determinedby use of a measuringfixturecomprised of two pulleys of equal diameter, a method of applying force, and a means of measuring the centerdistance between the two pulleys. One of the two pulleys is fixed in position whilethe other is movable along agraduated scale. Both pulleys are allowed to rotate. The fixture is shown schematically in Figure 2. Grooves'Ofmaster inspection pulleys shall be machined to dimension tolerances shown inTables 1Aand 2A, or 1Band2B, treated to resist wear, and checked periodicallyforwear and damage.

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MinimumCross Recommended

Section Effective Sg(1) Se rt rt rb Ft(2) <I>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 1 B-GROOVE DIMENSIONS-INCHES

MinimumCross Recommended

Section Effective Sg(1) Se rt rt rb Ft<2) <I>BALLSize Diameter :to.002 Min min max max max 2a 2k 2x(3) :to.0004

K 1.8 0.140 0.100 0.014 0.020 0.020 0.039 0.001 0.039 0.118 0.0984

L 3.0 0.185 0.130 0.D16 0.028 0.016 0.069 0.032 0.093 0.061 0.1378

SAE J1459 Revised AUG1997

TOTALMEASURING FORCE

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

FIGURE 2-DIAGRAM OF A FIXTURE FOR MEASURING V-RIBBED BELTS

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

Diameter OverBall or Rods

:to.10

96.48

161.51

TotalMeasuring Force

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

Diameter OverBall or Rods

:to.004

3.798

6.359

Total

Measuring ForcePer Rib

(Ib)

22

45

7.1 Length-To measure the length, the belt is placed on the measuring fixture at the total measuring force shownin Tables 2A and 2B, and rotated around the pulleys at least two revolutions to seat the belt properly in thepulley grooves and to divide the total force equally between the two strands of the belt. The midpoint of thecenter distance travel of the movable pulley defines the center distance and will be measured through aminimum of one revolution of the belt after the two seating revolutions. The belt effective length is equal to twotimes the center distance plus the pulley effective circumference. Standard belt center distance tolerances areshownin Tables3A and 3B. Forcenterdistancetoleranceslessthan standard,the belt manufacturershoul<:.~

be consulted.

TABLE 3A-STANDARD BELT CENTER DISTANCETOLERANCES-MILLIMETERS

Belt Length1250 and less

Over 1250 - 1600, incl

Over 1600 - 2000, incl

Over 2000 - 2500, Incl

Over 2500 - 3150, incl

Over 3150 - 4000, incl

Tolerance onCenter Distance

:t3.2:t4.0:t4.8:t5.6:t6.4:t7.2

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-.~--~

SAE J1459 Revised AUG1997

TABLE 3B-STANDARD BELT CENTER DISTANCETOLERANCES-INCHES

--

Belt Length

49 and less

Over 49- 63, incl-Over 0" ~-79rincl

Over 79 - 98, incl

Over 98 - 124, incl

Over 124 - 157, incl

Tolerance onCenter Distance

:to.13

:to.16

:to.19

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

:to.28

B. Standard Lengths-Standard lengths up to and including 2000 mm (79 in) are to be in 10 mm (0.4 in)increments. Standard lengths over 2000 mm (79 in) up to and including4000 mm (157 in) are to be in 25 mm(1.0 in) increments.

NOTE 1-The sides of the groove are to be 3.2 f.1m(125 f.1in)A.A. maximum............

NOTE2-Radial and axial run-out is not to exceed 0.35 mm (0.014 in) full indicator movement (FIM). Run-outin the two directions is measured separately with a ball mounted under spring pressure to followthegroove as the pulley is rotated.

NOTE3- The diameters over the ball gauges are not to vary from groove to groove more than 0.25 mm(0.010 in) foranyone belt groove set in a pulley.

NOTE 4-Centerline of gr~o bt::-go.Odegrees :I:0.5 degrees with pulley axis.-- . ~ diameter is used for calculation of speed ratio. The "x"dimension is radial. "2x"is to be-I-- - added to the effective diameter to determine the pitch diameter.

NOTE6- The apex diameter may be helpful for layout of pulley grooves or production tooling. "2a" issubtracted from the diameter over the balls to determine the apex diameter.

9. Notes

" " Marginal Indicia- The change bar (I) located in the left margin is for the convenience of the user in locatingareas where technical revisions have been made to the previous issue of the report. An (R)symbol to the leftofthe document titles indicates a complete revision of the report.

PREPARED BY THE SAE BELT DRIVE SYSTEMS COMMITTEE

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SAE J1459 Revised AUG1997

Rationale-Not applicable.

Relationship of SAE Standard to ISO Standard-Not applicable.

Application-This SAE Standard covers dimensions, tolerances, and methods of measurement of V-ribbedbelts and pull~ys for use on automotive drives.

Reference Section

RMA Engineering Standard IP-26 -----Developed by the SAE Belt-Drive Systems Committee

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