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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 entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefr
2、om, 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) 776-0243 TO PLACE A DOCU
3、MENT ORDER; (724) 776-4970 FAX: (724) 776-0790 SAE WEB ADDRESS http:/www.sae.org Copyright 1989 Society of Automotive Engineers, Inc. All rights reserved.Printed in U.S.A. SURFACE VEHICLE 400 Commonwealth Drive, Warrendale, PA 15096-0001 RECOMMENDED PRACTICE Submitted for recognition as an American
4、National Standard J1596 ISSUED JUN89 Issued1989-06 AUTOMOTIVE V-RIBBED BELT DRIVES AND TEST METHODS ForewordThis Document has not changed other than to put it into the new SAE Technical Standards Board Format. 1.ScopeThe following information covers engine accessory drive layout details and testing
5、methods and includes test configurations, pulley diameters, power loads, and guidance for interpreting test data. This information has been prepared from existing literature, including standards and data supplied by both producers and users of V-ribbed belts. When the engine is used to drive an exte
6、rnal unit equipped with industrial type V-pulleys and belts, it is recommended that the power takeoff pulley on the engine be grooved according to the appropriate industrial standard. These standards are published by RMA-MPTA (Rubber Manufacturers Association - Mechanical Power Transmission Associat
7、ion); ISO (International Standards Organization) and ASAE (American Society of Agricultural 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 as covered
8、in SAE J636 and J1459. 1.1PurposeThis recommended practice is intended as a guide to be used for evaluating V-ribbed belt construction, source approval, or quality audit. 2.References 2.1Applicable PublicationsThe following publications form a part of this specification to the extent specified herei
9、n. Unless otherwise indicated, the latest version of SAE publications shall apply. 2.1.1SAE PUBLICATIONSAvailable from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001. SAE J636V-belts and Pulleys SAE J1459V-ribbed Belts and Pulleys 3.General Drive Layout Considerations 3.1Belt SpeedIt is reco
10、mmended that the pulley diameters be as large as possible without exceeding 50 m/s belt speed. SAE J1596 Issued JUN89 -2- 3.2Pulley SizesThe inside pulleys should never be smaller than the tension pulley diameter specified in Tables 1 and 2 of this standard; however, belt life is directly related to
11、 pulley diameter. A more practical minimum pulley diameter, for increased belt life, would be 50 mm. (See 3.5 for backside pulley diameter recommendations.) 3.3Belt LengthThe calculation of the belt effective length (E.L.) for a specific drive involves several design considerations, including provis
12、ion 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 mean length belt at installation tension. This formula gives the minimum allowance for easy installation of the belt without prying or otherwise f
13、orcing it over the sides of the grooves. 3.3.1The following formula can be used to calculate the recommended minimum belt E.L. for installation: “K“ Section: Inside pulleys Min. Belt E.L.= 1.003(L1)+L2+.77+6.28(h) “K“ Section: Flat backside pulley Min. Belt E.L. = 1.003(L1)+L2+6.28(h) “L“ Section: I
14、nside pulleys Min. Belt E.L. = 1.005(L1)+L2+1.15+6.28(h) “L“ Section: Flat backside pulley Min. 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 belt installation formula used. L1 - The effective belt length (additio
15、n of span lengths and effective arc lengths on the pulleys) around the drive 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
16、 tolerance (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 - 1.1
17、5 value is 29 The belt length, flange height, and manufacturing tolerance are in inches in the English system and millimeters in the metric system. 3.3.2Select a belt to be used that has a nominal effective length equal to or greater than the recommended minimum E.L. SAE J1596 Issued JUN89 -3- 3.3.3
18、Calculate the maximum 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+L5 L3 - The nominal effective belt length as defined in 3.3.2. The 1.0145 (“K“ section) and 1.0190 (“L“ secti
19、on) factors account for elongation from measuring to installation tension and 1% for belt stretch and wear. L4 - “K“ section - 0.12 “L“ section - 0.19 Values for belt seating factor L5 - Positive manufacturing tolerance for belt length. (Tables 3A and 3B SAE J1459.) The formulas are in English units
20、 with belt length in inches. The metric units will be belt length in millimeters and the following seating factor changes: “K“ section - 0.12 value is 3.0 “L“ section - 0.19 value is 4.8 3.4Pulley MisalignmentThe recommended maximum misalignment between pulleys is 0.58 mm per 100 mm (0.069 in/ft) of
21、 span length or approximately 0.33 deg. 3.5Backside PulleysThe application design with backside pulleys is acceptable provided their minimum diameter 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 Method 4.1Test ConfigurationThe belt shall
22、 be mounted on a test fixture layout as shown in Figure 1 with the pulley diameters and speeds as given in Tables 1 and 2 and the installation clearance factor as shown in Table 3. 4.2Test LoadThe kilowatts (horsepower) to be absorbed at the driven pulley shall be as shown in Tables 1 and 2. 4.2.1Th
23、e driver pulley speed (rpm) shall be used in the torque load calculation, and the torque load shall be kept constant without compensation for loss of driven pulley rpm resulting from belt slippage. (Eq. 1) 4.2.2The test equipment shall be maintained to minimize parasitic loads due to bearing losses,
24、 lubricants, etc. 4.2.3The belt tensioning force shall be equal in the number of Newtons to sixty times the number of specified kilowatt units (in number of pounds to ten times the number of horsepower units). 4.3TemperatureThe ambient temperature of the test fixture shall be controlled to 80C 3 (17
25、5 F 5) within a suitable enclosure. Torque, N m Specified kilowatts9549 Driver rpm - - Torque, lbf in Specified horsepower63025 Driver rpm -= = SAE J1596 Issued JUN89 -4- 4.4Test ProcedureThe test procedure shall be as follows: 4.4.1Set the required torque load. 4.4.2Install the belt on the test fix
26、ture and apply the required belt tension. Condition the belt by running it for 5 min without the dynomometer load. Maintain a constant tension during this period by operating with the tension pulley center position unlocked. Stop the machine, allow it to stand for a minimum of 10 min and lock the te
27、nsion pulley center position midway of the limits of travel during belt rotation. 4.4.3Start the machine. Adjust the torque to the proper setting. Adjust the temperature to the proper setting. 4.4.4Whenever the slip reaches 8%, stop the machine, allow it to stand for a minimum of 20 min, unlock the
28、tension pulley center, restore the initial tension per 4.2.3 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 Guidelines 5.1Test LifeThe test life, which a belt must attain, shall be according to agr
29、eement between the manufacturer and user. 5.2Acceptable Number of Re-tensionsThe acceptable number of re-tensions after the initial 5 min run-in shall be according to agreement between the manufacturer and user. 5.3Failure CriteriaA belt shall be considered failed when it no longer transmits the spe
30、cified power because of breakage or it exceeds the number of agreed re-tensions. The belt manufacturer and user may agree on other acceptance/rejection criteria. 5.4Length vs. Life RelationshipGenerally speaking, the belt test life is a function of the belt length. The relationship shall be accordin
31、g to agreement between the belt manufacturer and user. 5.5Definition of Construction SpecificationsThe belt manufacturers test data on belts of a certain construction specification shall be considered valid for evaluation of all belts of the same construction specification when they are the same wit
32、h respect to the manufacturers cross section dimensions, material specifications, and method of manufacture. 5.6Belt Test LengthsThe test belt range will be: 10201400 mm (4055) in) with recommended length being 1200 mm (47.24 in). When evaluating for part source approval and for production quality s
33、urveillance, the test data from one belt length will be representative of all belt lengths of the same construction. 5.7Statistical RelationshipsWhether testing is performed for part source approval or for production surveillance, a realistic statistical guide to acceptability would be “not more tha
34、n 10% of the test lives shall be permitted to fall below 50% of the specified average life“. SAE J1596 Issued JUN89 -5- FIGURE 1V-RIBBED BELT FATIGUE TEST SAE J1596 Issued JUN89 -6- PREPARED BY THE SAE V-BELT COMMITTEE TABLE 1TEST CONDITIONS - METRIC SAE Belt Size Effective Diameter Driver Pulley Sp
35、eed rpm 2% Load (KW) Number of Ribs Belt Length Range Driver and Driven Pulleys 0.25 Tension Pulley 0.25 Idler Pulley 0.25 TotalPreferred PK 120.6 44.45 76.2 490010.43102014001200 PL b b b bbb102014001200 a = Groove details per SAE J1459 b = Not developed for Automotive belts TABLE 2TEST CONDITIONS
36、- ENGLISH SAE Belt Size Effective Diameter Driver Pulley Speed rpm 2% Load (HP) Number of Ribs Belt Length Range Driver and Driven Pulleys 0.010 Tension Pulley 0.010 Idler Pulley 0.010 TotalPreferred K 4.750 1.7503.000 4900 14340.1755.1447.26 L b b b bbb40.1755.1447.26 TABLE 3CLEARANCE FACTOR FOR BE
37、LT INSTALLATION SAE BELT SIZEC VALUE MetricEnglishmmin PKK3.070.12 PLL4.520.18 SAE J1596 Issued JUN89 RationaleNot applicable. Relationship of SAE Standard to ISO StandardNot applicable. ApplicationThe following information covers engine accessory drive layout details and testing methods and include
38、s test configurations, pulley diameters, power loads, and guidance for interpreting test data. This information has been prepared from existing literature, including standards and data supplied by both producers and users of V-ribbed belts. Reference Section SAE J636 FEB87V-belts and Pulleys SAE J1459 AUG88V-ribbed Belts and Pulleys Developed by the SAE V-Belt Committee