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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 there
2、from, 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. Copyright 2007 SAE International All rights reserved. No part of this publication m
3、ay 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: 724-776-4970 (outside USA)
4、 Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org J2489 REV. APR2007 SURFACE VEHICLE RECOMMENDED PRACTICE Issued 2000-04 Revised 2007-04 Superseding J2489 APR2000 SAE No. 2 Friction Test Machine Durability Test RATIONALE a. Dropped reference to GM, Ford and DC publi
5、cations as they were deemed not specific to be helpful nor widely available. b. Made changes in Section 7 data table references. Clarified chart references, removed appendix reference error. 1. SCOPE This SAE Recommended Practice is intended as the definition of a standard test, but may be subject t
6、o frequent change to keep pace with experience and technical advances. This should be kept in mind when considering its use. The SAE No 2 Friction Test Machine is used to evaluate the friction characteristics of automatic transmission plate clutches with automotive transmission fluids. It can also b
7、e used to conduct durability tests on wet friction systems. The specific purpose of this document is to define a Durability Test based on a specific power level selected from either the 3600 r/min Stepped Power Test or from the 6000 r/min Stepped Power Test, for the evaluation of wet friction system
8、 performance variation as a function of number of cycles. This standard procedure is intended for common use by both suppliers and end users to allow objective comparisons of wet friction material system performance. The only variables selected by the supplier or user of the friction system are: a.
9、Friction Material b. Fluid c. Reaction Plates These three variables must be clearly identified when reporting the results of this test. If any of the test parameters or system hardware as described in this document are changed, other than the friction material, test fluid, or reaction plates, the da
10、ta may not be reported as having been obtained using this document. This procedure is not intended to evaluate the initial coefficient or break-in characteristics. For this information, refer to SAE J2490 SAE No. 2 Friction Test Machine PVT Test. 2. REFERENCES 2.1 Applicable Publications The followi
11、ng publications form a part of this specification to the extent specified herein. Unless otherwise indicated, the latest version of SAE publications shall apply. Copyright SAE International Provided by IHS under license with SAELicensee=Defense Supply Ctr/5913977001 Not for Resale, 12/04/2007 18:58:
12、09 MSTNo reproduction or networking permitted without license from IHS -,-,- SAE J2489 Revised APR2007 - 2 - 2.1.1 SAE Publications Available from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970 (outside USA), www.sae.org. SAE J1646 G
13、lossary of TermsLubricated Friction Systems SAE J2487 SAE No. 2 Friction Test Machine 3600 r/min Stepped Power Test SAE J2488 SAE No. 2 Friction Test Machine 6000 r/min Stepped Power Test SAE J2490 SAE No. 2 Friction Test Machine PVT Test 2.2 Related Publications The following publications are for i
14、nformation purposes only and are not a required part of this specification. 2.2.1 SAE Publications Available from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970 (outside USA), www.sae.org. SAE J286 SAE No. 2 Clutch Friction Test Mach
15、ine Guidelines SAE J1499 SAE Band Friction Test Machine (SAE) Test Machine Guidelines 3. TEST EQUIPMENT As described in SAE J2487 and SAE J2488. 4. TYPICAL OPERATING CONDITIONS AND TEST PARAMETERS As described in SAE J2487 and SAE J2488 depending upon the conditions selected for the Durability Test.
16、 5. GENERAL TEST INFORMATION As described in the SAE J2487 and SAE J2488. 5.1 Test Description The Durability Test consists of 200 conditioning cycles, wherein the stop time is stabilized, followed by a specified number of cycles at the desired power level of either the 3600 r/min Stepped Power Test
17、 or the 6000 r/min Stepped Power Test. The conditioning cycles are run under the conditions of the first level of the Stepped Power Test selected for the Durability Test. The Durability cycles are accumulated by repeating the 200 dynamic cycles and breakaway cycle of the selected level of the Steppe
18、d Power Test. An example of test parameter reporting is detailed in Appendix B. 5.2 End of Level Inspection Shut down test stand. At the completion of the required dynamic engagements and the breakaway measurement, the housing is opened and the clutch pack carefully removed with special attention to
19、 ensure that the plates can be reinstalled in the exact same location and order relative to adjoining plates and fixed locations in the housing. Measurements are made of the friction element thickness as noted in 5.4 of SAE J2487 and J2488. Observations of the conditions of the reaction plates and f
20、riction elements and the fluid are recorded. Photographs may be taken to show the condition of the plates and assemblies. Copyright SAE International Provided by IHS under license with SAELicensee=Defense Supply Ctr/5913977001 Not for Resale, 12/04/2007 18:58:09 MSTNo reproduction or networking perm
21、itted without license from IHS -,-,- SAE J2489 Revised APR2007 - 3 - 6. DATA ACQUISITION 6.1 Data Acquisition Rate For digital data acquisition systems, the data is to be recorded at 1000 samples per second per channel using a 15 ms time constant RC filter. (Filtering can skew data. Preferred method
22、 is to record all raw data and manipulate later.) 6.2 Coefficient Calculations Coefficients are calculated for the following dynamic coefficients at every 25th engagement. (Reference SAE J1646) a. Midpoint dynamic 50%d b. Endpoint dynamic 100msdmax (Based on raw data single point value) The breakawa
23、y coefficients, obtained every 200 dynamic engagements, is defined as: Breakaway coefficient 1.0s4.37 6.3 Data Averaging and Filtering Data is to be averaged at the specified location in either the time or speed domain as specified in 6.1 with midpoint coefficient average values calculated using dat
24、a points 80 ms on both sides of the required calculation point. Endpoint coefficient average values are calculated from non-filtered peak torque data measured in the last 100 ms of the engagement. For the 1000 Hz-sampling rate, the averages are based on 161 data points. 7. DATA REPORTING 7.1 Data Ta
25、bles A data table detailing the friction material, spacer plate, test energy level and fluid along with the system performance at each 200 cycle test sequence in terms of the coefficients as described in 6.2 along with the average wear values and calculated E/M ratio are to be included in the report
26、. Example Figure A1 is given in Appendix A. 7.2 Figures There are two figures required in reporting the results of this test. Examples of the two figures are given in Appendix A, Figure A2. a. Figure of the midpoint dynamic coefficient and the cumulative average plate wear versus the test sequence n
27、umber. b. Figure of the E/M ratio and breakaway coefficient versus test sequence number. If the system does not successfully complete both the 200 dynamic engagement and the breakaway test, there is no data reported for that level. Alternatively, only data for the successful completion of a test seq
28、uence are to be reported. Failure is defined as complete destruction of the friction material/system. (Report number of cycles into level at which failure occurred.) 7.3 Optional Data Instantaneous plots of the 50th and 200th dynamic engagements at each test sequence may be provided. Additionally, c
29、omments and photographs on the condition of the plates at the end of each test sequence may also be included. Examples of such optional data are shown in Appendix A, Figure A3. Copyright SAE International Provided by IHS under license with SAELicensee=Defense Supply Ctr/5913977001 Not for Resale, 12
30、/04/2007 18:58:09 MSTNo reproduction or networking permitted without license from IHS -,-,- SAE J2489 Revised APR2007 - 4 - 8. NOTES 8.1 Marginal Indicia The change bar (l) located in the left margin is for the convenience of the user in locating areas where technical revisions have been made to the
31、 previous issue of the report. An (R) symbol to the left of the document title indicates a complete revision of the report. PREPARED BY THE SAE AUTOMATIC TRANSMISSION FRICTION STANDARDS COMMITTEE Copyright SAE International Provided by IHS under license with SAELicensee=Defense Supply Ctr/5913977001
32、 Not for Resale, 12/04/2007 18:58:09 MSTNo reproduction or networking permitted without license from IHS -,-,- SAE J2489 Revised APR2007 - 5 - APPENDIX A Examples of data tables, graphs and photos used in the reporting the results of this test are provided in this appendix. At a minimum the data tab
33、le and the midpoint coefficient plots must be presented. Optional data such as instantaneous plots and photographs may also be included. FIGURE A1 - DURABILITY TEST DATA CHART Copyright SAE International Provided by IHS under license with SAELicensee=Defense Supply Ctr/5913977001 Not for Resale, 12/
34、04/2007 18:58:09 MSTNo reproduction or networking permitted without license from IHS -,-,- SAE J2489 Revised APR2007 - 6 - FIGURE A2 - DURABILITY TEST GRAPHS Copyright SAE International Provided by IHS under license with SAELicensee=Defense Supply Ctr/5913977001 Not for Resale, 12/04/2007 18:58:09 M
35、STNo reproduction or networking permitted without license from IHS -,-,- SAE J2489 Revised APR2007 - 7 - FIGURE A3 - DURABILITY TEST INSTANTANEOUS DATA PLOTS Copyright SAE International Provided by IHS under license with SAELicensee=Defense Supply Ctr/5913977001 Not for Resale, 12/04/2007 18:58:09 M
36、STNo reproduction or networking permitted without license from IHS -,-,- SAE J2489 Revised APR2007 - 8 - APPENDIX B - TEST PARAMETER DETAIL EXAMPLE FIGURE B1 - TEST PARAMETER REPORTING FORMAT EXAMPLE Copyright SAE International Provided by IHS under license with SAELicensee=Defense Supply Ctr/5913977001 Not for Resale, 12/04/2007 18:58:09 MSTNo reproduction or networking permitted without license from IHS -,-,-