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 entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising there
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3、ublication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE. TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada) Tel: +1 724-776-497
4、0 (outside USA) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org SAE values your input. To provide feedback on this Technical Report, please visit http:/www.sae.org/technical/standards/J636_201211SURFACE VEHICLE STANDARD J636 NOV2012 Issued 1915-08 Revised 2012-11 S
5、uperseding J636 DEC2001 V-Belts and Pulleys RATIONALE Although antiquated in design compared to todays serpentine belt drives, V belts and pulleys are still common in many emerging markets. Additionally more economical manufacturing methods have been introduced over the years for the manufacture of
6、the V belt pulleys. The scope of the revisions are to introduce the industry acceptable tolerance of the alternate manufacturing method of spinning in comparison to cast/machined components. 1. SCOPE This specification covers standard dimensions, tolerances, and methods of measurement of V-belts and
7、 pulleys for automotive V-belt drives. 2. REFERENCES There are no referenced publications specified herein. 3. V-BELT TYPES Automotive V-belts are produced in a variety of constructions in a basic trapezoidal shape. The inside circumference of the V-belt can be a plain straight line or corrugated by
8、 means of cogs or notches for the purpose of increasing the belt(s) flexibility for use with pulleys in the lower proposed diameter. Belts are to be dimensioned in such a way that they are functional in pulleys dimensioned as described in subsequent sections. 4. PULLEYS Pulleys are to conform to req
9、uirements of Figure 1 and Tables 1A, 1B, 2A, and 2B. SAE J636 Revised NOV2012 Page 2 of 9 FIGURE 1 - V-BELT PULLEY DIMENSIONS SAE J636 Revised NOV2012 Page 3 of 9 TABLE 1A - V-BELT PULLEY DIMENSIONS, MM SAE Size Recommended1Min Effective Dia A Groove2Angle (deg) 0.5 W Effective Groove Width D Groove
10、Depth Min d Ball or Rod Dia (0.013)2K 2X Ball3Extension 2X4S Groove5Spacing (0.38) 6A 57 36 6.3 7 5.558 4.16 1.0 8.00 8A 57 36 8.0 9 7.142 5.63 1.3 10.49 10A 61 36 9.7 11 7.938 3.77 1.5 13.74 11A 70 36 11.2 13 9.525 5.88 1.8 15.01 13A 76 36 12.7 14 11.113 7.99 2.0 16.79 15A 76 34 6.42 Over 102 36 15
11、.2 14 12.700 7.02 0 19.76 Over 152 38 7.56 17A 76 34 8.21 Over 102 36 16.8 15 14.288 8.82 0.5 21.36 Over 152 38 9.38 20A 89 34 11.77 Over 114 36 20.0 18 17.463 12.42 1.0 24.54 Over 152 38 13.02 23A 102 34 15.67 Over 152 36 23.1 21 20.638 16.33 1.5 27.71 Over 203 38 16.94 1Pulley effective diameters
12、below those recommended should be used with caution, because power transmission and belt life may be reduced. 21.0 for spun fabricated pulleys. 32K dimensions are calculated in millimeters. 42X is to be subtracted from the effective diameter to obtain “pitch diameter“ for speed ratio calculation. 5T
13、hese values are intended for adjacent grooves of the same effective width (W). Choice of pulley manufacture or belt design parameter may justify variance from these values. The S dimension shall be the same on all multiple groove pulleys in a drive using matched belts. SAE J636 Revised NOV2012 Page
14、4 of 9 TABLE 1B - V-BELT PULLEY DIMENSIONS, IN SAE Size Recommended6Min Effective Dia A Groove7Angle (deg) 0.5 W Effective Groove Width D GrooveDepth Min d Ball or Rod Dia (0.0005)2K 2X Ball Extension 2X8S Groove9Spacing (0.015) 0.250 2.25 36 0.248 0.276 0.2188 0.164 0.04 0.315 0.315 2.25 36 0.315 0
15、.354 0.2812 0.222 0.05 0.413 0.380 2.40 36 0.380 0.433 0.3125 0.154 0.06 0.541 0.440 2.75 36 0.441 0.512 0.3750 0.231 0.07 0.591 0.500 3.00 36 0.500 0.551 0.4375 0.314 0.08 0.661 11/16 (0.600) 3.00 34 0.597 0.551 0.500 0.258 0.00 0.778 Over 4.00 36 0.280 Over 6.00 38 0.302 3/4 (0.660) 3.00 34 0.660
16、0.630 0.5625 0.328 0.02 0.841 Over 4.00 36 0.352 Over 6.00 38 0.374 7/8 (0.790) 3.50 34 0.785 0.709 0.6875 0.472 0.04 0.966 Over 4.50 36 0.496 Over 6.00 38 0.520 1 (0.910) 4.00 34 0.910 0.827 0.8125 0.616 0.06 1.091 Over 6.00 36 0.642 Over 8.00 38 0.666 6Pulley effective diameters below those recomm
17、ended should be used with caution, because power transmission and belt life may be reduced. 71.0 for spun fabricated pulleys. 82X is to be subtracted from the effective diameter to obtain “pitch diameter“ for speed ratio calculation. 9These values are intended for adjacent grooves of the same effect
18、ive width (W). Choice of pulley manufacture or belt design parameter may justify variance from these values. The S dimension shall be the same on all multiple groove pulleys in a drive using matched belts. SAE J636 Revised NOV2012 Page 5 of 9 TABLE 2A - MEASURING PULLEY DIMENSIONS, MM SAE Size d1Eff
19、ective Dia (0.05) Effective Pulley Circumference A Groove Angle (deg) 0.15 W Effective Groove Width D Groove Depth Min d Ball or Rod Dia (0.013) d2Dia10Over Balls or Rods (0.05) 6A 97.03 304.8 36 6.3 7 5.558 101.18 8A 97.03 304.8 36 8.0 9 7.142 102.66 10A 97.03 304.8 36 9.7 11 7.938 100.80 11A 97.03
20、 304.8 36 11.2 13 9.525 102.91 13A 97.03 304.8 36 12.7 14 11.113 105.02 15A 97.03 304.8 34 15.2 14 12.700 103.45 17A 97.03 304.8 34 16.8 16 14.288 105.24 20A 121.29 381.0 34 20.0 18 17.463 133.06 23A 121.29 381.0 34 23.1 21 20.638 136.96 TABLE 2B - MEASURING PULLEY DIMENSIONS, IN SAE Size US d1Effec
21、tive Dia (0.002) Effective Pulley CircumferenceA Groove Angle (deg) 0.15 W Effective Groove Width D Groove Depth Min d Ball or Rod Dia (0.0005) d2Dia Over Balls or Rods (0.002) 0.250 3.820 12.000 36 0.248 0.276 0.2188 3.984 0.315 3.820 12.000 36 0.315 0.354 0.2812 4.042 0.380 3.820 12.000 36 0.380 0
22、.433 0.3125 3.974 0.440 3.820 12.000 36 0.441 0.512 0.3750 4.051 0.500 3.820 12.000 36 0.500 0.551 0.4375 4.134 11/16 (0.600) 3.820 12.000 34 0.597 0.551 0.5000 4.078 3/4 (0.660) 3.820 12.000 34 0.660 0.630 0.5625 4.148 7/8 (0.790) 4.775 15.000 34 0.785 0.709 0.6875 5.247 1 (0.910) 4.775 15.000 34 0
23、.910 0.827 0.8125 5.391 10d2dimensions are calculated in millimeters. SAE J636 Revised NOV2012 Page 6 of 9 5. V-BELT MEASUREMENT Belt length and SAE size are defined by using effective length and rideout as measured in standard pulleys. These are determined by use of a measuring fixture comprised of
24、 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. The fixture is shown schematically in Figure 2. Specifications for measuri
25、ng pulley dimensions are given in Tables 2A and 2B and Figure 3. FIGURE 2 - DIAGRAM OF A FIXTURE FOR MEASURING V-BELTS FIGURE 3 - MEASURING PULLEY DIMENSIONS SAE J636 Revised NOV2012 Page 7 of 9 5.1 Length To measure the length, the belt is placed on the measuring fixture at the force shown in Table
26、s 3A and 3B, and rotated around the pulleys at least two revolutions of the belt to seat the belt properly in the pulley grooves and to divide the total force equally between the two strands of the belt. The mid-point of the center distance travel of the movable pulley defines the center distance an
27、d will be measured through one revolution of the belt minimum after the two seating revolutions. The belt effective length is equal to two times the center distance plus the effective pulley circumference. Standard belt center distance tolerances are shown in Tables 4A and 4B. TABLE 3A - MEASURING C
28、ONDITIONS AND RIDEOUT, SI UNITS SAE Size Metric Total Measuring Force, N Rideout11mm Rideout(11)Tolerance mm 6A 222 0.8 0.8 8A 222 0.8 0.8 10A 267 1.5 1.1 11A 267 1.0 1.1 13A 267 1.5 1.1 15A 267 2.3 1.1 17A 356 2.3 1.1 20A 445 2.3 1.1 23A 534 2.3 1.1 TBALE 3B - MEASURING CONDITIONS AND RIDEOUT, U.S.
29、 CUSTOMARY UNITS SAE Size In Total Measuring Force, lbf Rideout12in Rideout(12)Tolerance in 0.250 50 0.031 0.031 0.315 50 0.031 0.031 0.380 60 0.060 0.045 0.440 60 0.040 0.045 0.500 60 0.060 0.045 11/16 (0.600) 60 0.090 0.045 3/4 (0.660) 80 0.090 0.045 7/8 (0.790) 100 0.090 0.045 1 (0.910) 120 0.090
30、 0.045 11The belt rideout, as measured along the circumference of the belt, must fall within the specified tolerance at all points with the exception of measurements at points of dimension variations inherent to the manufacturing process or product such as material splices, belt identifications, etc
31、. 12The belt rideout, as measured along the circumference of the belt, must fall within the specified tolerance at all points with the exception of measurements at points of dimension variations inherent to the manufacturing process or product such as material splices, belt identifications, etc. SAE
32、 J636 Revised NOV2012 Page 8 of 9 TABLE 4A - STANDARD BELT CENTER DISTANCE TOLERANCES, MM Belt Length Tolerance on Center Distance 1270 and less 3.0 Over 12701524, incl. 4.1 Over 15242032, incl. 4.8 Over 20322540, incl. 5.6 TABLE 4B - STANDARD BELT CENTER DISTANCE TOLERANCES, IN Belt Length Toleranc
33、e on Center Distance 50 and less 0.12 Over 5060, incl. 0.16 Over 6080, incl. 0.19 Over 80100, incl. 0.22 5.2 Rideout The rideout standard and rideout tolerance are shown in Table 3. The rideout of a belt section is determined by measuring from a straight edge across the top of the belt to the rim of
34、 the measuring pulley, as shown in Figure 4. FIGURE 4 - MEASURING BELT RIDE 5.3 Matched Belt Sets For V-belts used in sets of two or more for a general application, the difference in center distance between the belts cannot exceed the values shown in Table 5. SAE J636 Revised NOV2012 Page 9 of 9 TAB
35、LE 5A - MAXIMUM CENTER DISTANCE DIFFERENCE FOR BELTS IN A SET, MM SAE Size 6A 0.8 8A 0.8 10A 1.0 11A 1.0 13A 1.0 15A 1.5 17A 1.5 20A 1.5 23A 1.5 TABLE 5B - MAXIMUM CENTER DISTANCE DIFFERENCE FOR BELTS IN A SET, IN SAE Size 0.250 0.03 0.315 0.03 0.380 0.04 0.440 0.04 0.500 0.04 11/16 (0.600) 0.06 3/4
36、 (0.660) 0.06 7/8 (0.790) 0.06 1 (0.910) 0.06 6. STANDARD LENGTHS Standard lengths up to and including 2032 mm (80 in) are to be 12.7 mm (1/2 in) increments. Standard lengths over 2032 mm (80 in) up to and including 2540 mm (100 in) are to be 25.4 mm (1 in) increments without fractions. 7. NOTES 7.1
37、 Marginal Indicia A change bar (l) 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 (AUTOMOTIVE) SYSTEMS COMMITTEE
