SAE J2432 pdf download

SAE J2432 pdf download.Performance Testing of PK Section V-Ribbed Belts.
1. The following information covers accessory drive belt testing methods and includes test configurations, pulley diameters, power loads, and guidance for interpreting test data. This information has been prepared from existing lite.ature, induding standards and data supplied by producers and users of Vribbed belts.
1.1 Purpose—This SAE Standard is intended to provide methods to evaluate the performance. source approval, andor Quality audit of V-fibbed belt constructions.
1.2 Test Sample Size—The number of test samples should be statistically significant based on the requirements agreed to between each manufacturer and user.
1.3 Belt Test Lengths—The test belt range is 1200 mm ± 10 mm, Test data from bells 04 this length wiN be considered valid for all belt lengths 04 the same construction and specification.
1.4 Definition of Construction Specirication—The belt manufacturers test data on belts of a certain construction shall be considered valid for evaluation of all bells, with respect to the manufactures cross section dimensions, material specifications, and method of manufacture.
1.5 Belt Temperature Rating—Belts shall be rated according io temperature capability. Belt types have been defined in 4.2 and 5.2. Belts capable of passing the extreme temperature tests shall be given a two letter designation, the first letter being the High Temperature capability and the second letter being the low temperature capability. For example, an ‘AA’ belt is rated for 121 C to -43 C. a ‘BA’ belt is for 107 C to – 43 C.
1.6 Pulley Construction—Unless otherwise specified, all pulleys used on test fixtures should be machined steel pulleys, manufactured to SAE measurement puley tolerances as shown in SAE J1459.
5.4 Test Fixture Setup
541 Hot FixntE Scrup—The four puley stand is shown in Figure 1.
5.4.1.1 Tension—The tension wiN be maintawied either with a dead weight device or an automatic tensioner. If an automatic tensioner is used, the tension must be within ±5% at all times, or the test must be started over with a new belt.
5.4.1.2 Power Absorber—The driven pulley is to be attached to a power absorption unit capable ol handling the power indicated previously.
5.4.1.3 Motor—The life testing unit is driven by a motor sized to handle the sustained horsepower load pkis system losses at the RPM indicated previously A torque recovery system may be used.
5.4.1.4 Temperature Control—The test stand should be mapped and proven to be capable of no more than ±2 C variation throughout the test area. statically. Test stand must have at least one thermocouple centered on the horizontal centerline of the small pulleys. midway between the centers ol these pulleys for test stand control. It is recommended that stands be recertified when modified or annually if rio modifications ere performed.
5.4.1.5 MIscellaneous—A governor capable of stopping the dnver motor is to be mounted on the driven puley. Test stand pulley misalignment should be less than 0.5 degree.
5.4.2 CoLD FIXTURE SETUP—The four pulley stand is shown in Figure 1.
5.4.2.1 Tension—The tension wiN be maintained either with a dead weight device or an automatic tensioner, If an automatic tensioner Is used, the tension must be within ±5% at all times, or the test must be started over with a new baIt.
5.4.2.2 Temperature Control—Thermocouples to be located at each of the 4 pulley interfaces. No greater than
2 °C vaflation among these 4 thermocouples at the end of the presoak will be allowed to assure the minimization of thermal gradients.
5.4.2.3 Motor—The life testing unit is driven by a motor sized to handle system losses at the RPM Indicated previously.
5.4.2.4 Miscellaneous—A governor capable of slopping the driver motor is to be mounted on the driven pulley. Belt misalignment shotid be less than 0.5 degree.
5.5 Test Procedure
5.5.1 Hot TEST PROCEDURE
5.5.1.1 Remove any grease, rubber, or other foreign material from the pulley grooves.
5.5.1.2 Weigh belt and instal the belt on the test fixture and apply the required belt tension. The belt tension must be maintained constant throughout the life of the test. Tension tolerance Is ±5% for the constant tension test.
5.5.1.3 Set and maintain the driver pulley at speed.