J1459_200912 V-Ribbed Belts and Pulleys

2024年2月8日发(作者：)

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SURFACE

VEHICLE

STANDARD

V-Ribbed Belts and Pulleys

RATIONALE

J1459 DEC2009

Issued 1984-08

Revised 2009-12

Superseding J1459 SEP2001

This document has been revised to update the pulley cross sections, specifically the definition of pulley flanges to improve

robustness against belt misinstallation.

1. SCOPE

This SAE Standard covers the dimensioning technique, tolerances, and methods of measurement of V-ribbed belts and

mating pulleys for use on automotive accessory drives.

2. REFERENCES

There are no referenced publications specified herein.

3. V-RIBBED BELTS

Although several v-ribbed cross sections are available, this document shall be confined to “PK” (K) section belts which are

used in automotive applications, including trucks at least up to Class 3. Belts shall conform to Figure 1.

4. PULLEYS MATING WITH V-RIBBED BELTS

It is the intention of this document to relate the belt profile to the pulley profile using the variables associated with the

2.50 mm ball used in measuring pulley diameters. Pulleys shall conform to Figures 2, 3 and 4. Figure 2 shows a split

pulley section, Figure 3 a folded pulley section – both preferred constructions. Figure 4 shows an optional folded pulley

section.

4.1 Pulley Diameter Definitions

The diameter over balls (DoB) is the only diameter measured on a pulley in the groove/flange area. There are other

diameters used that are calculated from this value. The ball diameter is defined as 2.500 mm ± 0.010 mm. See Tables

1A and 1B.

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TABLE 1A - PULLEY DIAMETER - 40 DEGREES GROOVE

(for calculation purposes only - 40 degrees groove)

Diameter Definition

Effective

Db - 0.99 (Groove Dia. with 0.25R Tip)

Effective

Db - 1.706 (Groove Dia. with 0.48R Tip)

Apex Db - 0.03 (Flank Intersect.)

Pitch

Db + 2PBΔg (To Cord Line)

Db + 2.01 Ref. (Previous Defined Estimate)

TABLE 1B - PULLEY DIAMETER - 37 DEGREES GROOVE

(for calculation purposes only - 37 degrees groove)

Diameter Definition

Effective

Db - 0.82 (Groove Dia. with 0.25R Tip)

Effective

Db - 1.648 (Groove Dia. with 0.48R Tip)

Apex Db - 0.26 (Flank Intersect.)

Pitch

Db + 2PBΔg (To Cord Line)

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J1459 Revised DEC2009 Page 3 of 9

FIGURE 1 - BELT DIMENSIONING TEMPLATE

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J1459 Revised DEC2009 Page 4 of 9

Notes:

1. This template applies to pulleys with DoB >70mm except where

shown

2. All dimensions apply unpainted

3. Dimensioning and tolerancing to ASME Y 14.5M-1994

4. Digital profilometer/vision system required for production metrology

5. Points B & C must be on a line at a greater diameter than the tangent

point of the root radii

6. Points D & E must be on a line at a greater diameter less than the tip

radii

Y and Z are functions of material thickness and supplier processes; to

be defined numerically on the drawing.

Coating must be smooth and even within AREA A

Tolerances are recommended values, and may be modified based on

metrological data by agreement between OEM and supplier

Unless otherwise specified:

Max imbalance = 44/R g-cm (R = highest pulley ratio for this pulley)

Stamped surfaces

α±1°α/2 ±1°

Providing α±1° is maintained. Groove

angle assessed when mounted on

datum feature with gage

centerplane established by datum

α = 40° for DoB>70mm

α=37°forDoB<70mm

Pulleys with DoB <70mm

is surface feature parallel to the sheave plane

is axis of rotation or feature perpendicular to

or may be primary depending upon

application (e.g. push-on versus bolt-on)

FIGURE 2 - 'SPLIT' PULLEY DIMENSIONING TEMPLATE (6) GROOVE SHOWN (TYPICAL)

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J1459 Revised DEC2009 Page 5 of 9

Notes:

1. This template applies to pulleys with DoB >70mm except where

shown

2. All dimensions apply unpainted

3. Dimensioning and tolerancing to ASME Y 14.5M-1994

4. Digital profilometer/vision system required for production metrology

5. Points B & C must be on a line at a greater diameter than the tangent

point of the root radii

6. Points D & E must be on a line at a greater diameter less than the tip

radii

Y and Z are functions of material thickness and supplier processes; to

be defined numerically on the drawing.

Coating must be smooth and even within AREA A

Tolerances are recommended values, and may be modified based on

metrological data by agreement between OEM and supplier

Unless otherwise specified:

Max imbalance = 44/R g-cm (R = highest pulley ratio for this pulley)

Stamped surfaces

α±1°α/2 ±1°

Providing α±1° is maintained. Groove

angle assessed when mounted on

datum feature with gage

centerplane established by datum

α = 40° for DoB>70mm

α=37°forDoB<70mm

Pulleys with DoB <70mm

is surface feature parallel to the sheave plane

is axis of rotation or feature perpendicular to

or may be primary depending upon

application (e.g. push-on versus bolt-on)

FIGURE 3 - 'FOLDED' PULLEY DIMENSIONING TEMPLATE (6) GROOVE SHOWN (TYPICAL)

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J1459 Revised DEC2009 Page 6 of 9

Notes:

1. This template applies to pulleys with DoB >70mm except where

shown

2. All dimensions apply unpainted

3. Dimensioning and tolerancing to ASME Y 14.5M-1994

4. Digital profilometer/vision system required for production metrology

5. Points B & C must be on a line at a greater diameter than the tangent

point of the root radii

6. Points D & E must be on a line at a greater diameter less than the tip

radii

Y and Z are functions of material thickness and supplier processes; to

be defined numerically on the drawing.

Coating must be smooth and even within AREA A

Tolerances are recommended values, and may be modified based on

metrological data by agreement between OEM and supplier

Unless otherwise specified:

Max imbalance = 44/R g-cm (R = highest pulley ratio for this pulley)

Stamped surfaces

α±1°α/2 ±1°

Providing α±1° is maintained. Groove

angle assessed when mounted on

datum feature with gage

centerplane established by datum

α = 40° for DoB>70mm

α=37°forDoB<70mm

Pulleys with DoB <70mm

is surface feature parallel to the sheave plane

is axis of rotation or feature perpendicular to

or may be primary depending upon

application (e.g. push-on versus bolt-on)

FIGURE 4 - OPTIONAL 'FOLDED' PULLEY DIMENSIONING TEMPLATE (6) GROOVE SHOWN (TYPICAL)

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5. MEASUREMENT METHOD

J1459 Revised DEC2009 Page 7 of 9

Since the templates in Figures 1 to 4 have profile of a line callouts, it is necessary to capture the entire profile digitally and

compare it to the drawing dimensions. This requires a digital profilometer or digital vision system and eliminates the

optical comparator as acceptable for metrology. Because of the inherent speed of these devices, the frequency of audit

may have to be reduced, depending on the process used in production. If verification of ongoing quality requires more

frequent measurement, the audit with the profilometer is still required, while the supplier can use traditional methods to

measure additional belts or pulleys to satisfy an internal process control characteristic, if they feel the need.

6. BELT DIMENSION DETERMINATION

The shape of the belt profile changes with bending, either as profiled back bent, if it is not molded, or between

manufacture and measurement. The intent of the document is to achieve a precise mating of the belt as bent around a

grooved pulley. The 37 degree pulley standard deals with the distortion of the belt around small diameter pulleys. For

larger pulleys, the 40 degree belt rib angle is to be defined on a 127 mm pulley as measured in an arch with a dental

compound casting, or equivalent. The detail drawing is to show the rib dimensions as measured in production with the

digital profilometer (usually flat). These dimensions may be different from those measured in the arch. Once the

relationship between the arch and the production measurements due to the rubber distortion is established, the arch

dimensions shall not be measured on an ongoing basis, but rather the detail drawing dimensions representing the flat

profilometer method.

7. METROLOGICAL ISSUES

In order to facilitate the execution of the programs for digital profilometers to measure both belts and pulleys, it is

permissible to calculate the points defined on the flanks of the belt ribs or pulley grooves. This can be done from the line

defined by points along the rib/groove flank line between the tangent points of the tip and root radii. Gage R&R improves

with increasing distance between the points selected. Precise methodology can be mutually agreed upon between

supplier and OEM.

8. V-RIBBED BELT SIZE

Belt size is designated by a standard series of alphanumeric characters. Belts measured on a metric length system are

designated by the number of ribs followed by the belt cross-sectional size (“PK” or “PL”) and the effective length in

millimeters. For example, 6PK1370 signifies a 6-rib “PK” section belt, with an effective length of 1370 mm.

9. MEASUREMENT OF V-RIBBED BELTS

The length of a V-ribbed belt is determined by use of a measuring fixture comprised of two pulleys of equal diameter, a

method of applying force, and a means of measuring the center distance between the two pulleys. One of the two pulleys

is fixed in position while the other is movable along a graduated scale. Both pulleys are allowed to rotate. The fixture is

shown schematically in Figure 5. Grooves of master inspection pulleys shall be machined to dimension tolerances shown

in Table 2, treated to resist wear, and checked periodically for wear and damage.

FIGURE 5 - DIAGRAM OF A FIXTURE FOR MEASURING V-RIBBED BELTS

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J1459 Revised DEC2009

TABLE 2 - MEASURING CONDITIONS - MILLIMETERS

Page 8 of 9

Total dB

Ball or Rod Diameter Over Measuring Force Cross Effective Effective

Diameter Ball or Rods Per Rib Section Diameter Circumference

±0.010 ±0.10 (N) Size (reference) (reference)

PK 95.49 300 2.500 96.48 100

9.1 Length

To measure the length, the belt is placed on the measuring fixture at the total measuring force shown in Table 2, and

rotated around the pulleys at least two revolutions to seat the belt properly in the pulley grooves and to divide the total

force equally between the two strands of the belt. The midpoint of the center distance travel of the movable pulley defines

the center distance and will be measured through a minimum of one revolution of the belt after the two seating

revolutions. The belt effective length is equal to two times the center distance plus the pulley effective circumference.

Standard belt center distance tolerances are shown in Table 3. For center distance tolerances less than standard, the

belt manufacturer should be consulted.

TABLE 3 - STANDARD BELT CENTER DISTANCE

TOLERANCES(1) - MILLIMETERS

Belt Length

0 – 1200

Over 1200 – 2000

Over 2000 – 2500

Over 2500 – 3000

Tolerance on

Center Distance

± –4.0

± –5.0

± –6.0

± –7.0

1. These tolerances are for reference only, and depend on manufacturing

process as well as cost. Supplier and OEM agreement must be

reached on each application.

10. OTHER DIMENSIONAL NOTES

Standard lengths up to and including 2000 mm are to be in 10 mm increments. Standard lengths over 2000 mm up to

and including 4000 mm are to be in 25 mm increments.

NOTE 1: The sides of the groove are to be 3.2 µm A.A. maximum.

NOTE 2: Radial and axial run-out is not to exceed 0.25 mm full indicator movement (FIM). Run-out in the two directions

is measured separately with a ball mounted under spring pressure to follow the groove as the pulley is rotated.

NOTE 3: The diameters over the ball gauges are not to vary from groove to groove more than 0.25 mm for any one belt

groove set in a pulley.

NOTE 4: Centerline of groove is to be 90.0 degrees ± 0.5 degrees with pulley axis.

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11. NOTES

11.1 Marginal Indicia

J1459 Revised DEC2009 Page 9 of 9

A change bar (I) located in the left margin is for the convenience of the user in locating areas where technical revisions,

not editorial changes, have been made to the previous issue of this document. An (R) symbol to the left of the document

title indicates a complete revision of the document, including technical revisions. Change bars and (R) are not used in

original publications, nor in documents that contain editorial changes only.

PREPARED BY THE SAE BELT DRIVE SYSTEMS COMMITTEE