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 revised, reaffirmed, stabilized, or cancelled. SAE invites your written comments and suggestions. Copyright 2012 SAE International All rights reserved. No part of this p
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/ARP5483/7A AEROSPACE RECOMMENDED PRACTICE ARP5483/7 REV. A Issued 2002-12 Revised
5、 2012-09 Superseding ARP5483/7 Dynamic Radial Load Test, Track Roller Bearings RATIONALE ARP5483/7A is a five-year review with only minor editorial changes. 1. SCOPE This test method outlines the recommended machine function, fixtures and procedures for performing dynamic radial load tests on track
6、roller bearings for airframe applications. Bearings covered by this test method shall be yoke and stud type track roller, needle bearings. 2. APPLICABLE DOCUMENTS The following publications form a part of this document to the extent specified herein. The latest issue of SAE publications shall apply.
7、 The applicable issue of other publications shall be the issue in effect on the date of the purchase order. In the event of conflict between the text of this document and references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable law
8、s and regulations unless a specific exemption has been obtained. 2.1 SAE Publications Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970 (outside USA), www.sae.org. AS39901 Bearings, Roller, Needle, Airframe,
9、 Antifriction, Inch 3. GENERAL REQUIREMENTS 3.1 Test Machine The test machine shall be capable of applying a radial load equivalent to the Capacity as a Track Roller to the bearing, as defined in the applicable drawing standard, with either reversing or rotating motion. Instructions for operating an
10、d maintaining the test machine are required. SAE ARP5483/7A Page 2 of 6 3.1.1 Design A test machine may test any number of bearings simultaneously, providing all bearings are being subjected to the same test conditions and that all measured values can be individually determined. The support structur
11、e, drive motor or system, tracks, and mechanisms should be designed for continuous operation and high reliability. 3.1.2 Test Fixtures The test fixtures shall be similar to the illustration in Figures 1 and 2. The rigid support shall be of steel construction. FIGURE 1 - TEST FOR DYNAMIC LOAD RATING,
12、 AS A YOKE TYPE TRACK ROLLER FIGURE 2 - TEST FOR DYNAMIC LOAD RATING, AS AN INTEGRAL STUD TYPE TRACK ROLLER SAE ARP5483/7A Page 3 of 6 3.1.3 Load Application The load can be applied by any means providing the magnitude of load to each test bearing is verifiable. The load must remain constant within
13、2% for the duration of each test. 3.1.4 Rotational Speed The speed of the bearing outer diameter shall be controllable within the speed range of the applicable procurement standard. 3.1.5 Re-lubrication Provisions Provisions shall be available for re-lubrication of the bearings during testing, as re
14、quired. 3.2 Safety Provisions The test machine shall be configured to the extent necessary to provide safety of personnel operating the test. In particular, moving shafts, belts, chains and mechanisms shall be shrouded or otherwise protected. Electrical controls shall be housed in consoles to avoid
15、shock hazards. Automatic shutoffs shall be provided for the test machine to detect mechanical, electrical or hydraulic problems that endanger personnel or cause property damage due to fire, smoke or explosion. 3.3 Quality Assurance Verify and document that the following items have been checked and a
16、re acceptable: a. Operating instructions and maintenance procedures for the test machine are prepared and are understood by the operator of the test machine. b. Safety requirements have been met and no additional safety hazards exist. c. Test machine is operational and all required test parameters a
17、re within specified limits. d. All instrumentation is functional and within calibration limits. 3.4 Specimen 3.4.1 Test Bearing Sizes and quantities of the test bearings shall be as specified in the applicable procurement standard. 3.4.2 Disposition of Test Bearings The test bearings shall be remove
18、d from the test machine for post-test inspections as required by the procurement standard. Disposition of the tested bearings shall be in accordance with that standard. 3.5 General The bearing shall be mounted in the appropriate test fixture similar to that shown in Figures 1 and 2 and installed in
19、the test machine. A load shall be applied so that the load requirements of the applicable drawing standard are met and maintained throughout the operation of the test. The linear velocity of the bearing outside diameter shall be as specified in the applicable procurement standard. If the motion is p
20、eriodically reversed, the bearing shall rotate at least one complete revolution before direction is reversed. Testing on a rotating circular cam or track is an acceptable method, without reversal of direction. When the applicable procurement standard permits, the test bearing may be re-lubricated on
21、 a periodic basis. Testing shall continue until bearing failure or until the minimum number of revolutions specified by the applicable procurement standard have been completed. SAE ARP5483/7A Page 4 of 6 3.5.1 Failure During Test Stop the test if the bearing seizes or a component fractures. 4. DETAI
22、LED REQUIREMENTS 4.1 Test Bearing Analysis Bearings reaching the required number of revolutions shall be removed from the test fixture, disassembled and examined. Records of the bearings condition shall be maintained with the test data and pre-test measurements. 4.1.1 Premature Removal Bearings fail
23、ing to reach the required number of revolutions shall also be examined to determine the cause of failure, and recorded. 5. NOTES 5.1 Intended Use This test method is intended to provide a means for evaluating the performance of yoke and stud type track roller type rolling bearings for airframe appli
24、cations under dynamic radial loads. 5.2 Method of Reference This test method shall be referenced in procurement standards, drawings or bearing standards for track roller type airframe bearings. Specific test and data requirements are given in the applicable standard. The following note shall be used
25、 to reference this test method: NOTE: The bearings shall be tested in accordance with ARP5483/7. 5.3 Test Data 5.3.1 Test Parameters Specific test requirements are given in the referencing document. Test requirements shall include the following test parameters as applicable: a. Test specimen design
26、envelope b. Shaft and housing configuration c. Radial load d. Track speed e. Number of revolutions, including partial revolutions, in each direction of rotation f. Original grease pre-pack, including grease specification and brand name g. Frequency of re-lubrication if applicable (in terms of bearin
27、g revolutions) h. Test duration (revolutions) i. Failure criteria (breakage, etc.) SAE ARP5483/7A Page 5 of 6 5.3.2 Data Requirements Specific load requirements are specified in the applicable specification. Data requirements shall include the following measurements as applicable: a. Radial load b.
28、Track speed c. Number of revolutions completed before removal from test d. Reason for removal from test e. Analysis of bearing condition following removal from test 5.3.3 Test Records A log shall be maintained during the test and shall include a record of revolutions, loads, start and stop times, ma
29、intenance performed on the test machine, and any other pertinent information relating to the test. Data indicating the progress of the test shall be recorded at sufficient intervals to produce an accurate record of the test progress. Data sheets shall be filled out when data is taken during the test
30、. Test data sheets shall include but not be limited to the following: a. Test machine number b. Test number/Request number c. Bearing number and serial number d. Initial test start date e. Load per bearing - lbf f. Bearing speed - rpm g. Initial lubrication type h. Re-lubrication date/revolution i.
31、Date/clock - am/pm j. Hours to date k. Temperature - bearing/ambient l. Remarks Readings from computers, gages, controls or any other recording devices shall be taken at specified intervals and the records maintained sufficiently to support reporting of the test results. SAE ARP5483/7A Page 6 of 6 5
32、.3.4 Test Report The recorded data shall be summarized in report form and shall contain the following: 5.3.4.1 Bearing Description a. Part number b. Identification c. Manufacturer d. A dated drawing completely describing the test bearing, including the dimensions, material and the rating 5.3.4.2 Tes
33、t Machine-Description a. Model number, serial number and a brief description b. Calibration data c. Photograph 5.3.4.3 Test Parameters See 5.3.1. 5.3.4.4 Data Sheets The data collected shall be summarized in the test report. Data sheets shall be kept on permanent file at the testing facility for rev
34、iew on request (see 5.3.3). 5.3.4.5 Any test malfunction resulting in an invalid test or in an interruption in the test shall be noted. 5.3.4.6 Results of all inspections. 5.3.4.7 To ensure accuracy of test data, the bearing suppliers (or testing laboratory) shall certify that the data presented is
35、performance data for all bearings tested in the report and that no data has been deleted. 5.4 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 (
36、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 SAE SUBCOMMITTEE ACBG-2, ROLLING ELEMENT OF COMMITTEE ACBG, AIRFRAME CONTROL BEARINGS STEERING GROUP
