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 2009 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: +1 724-776-4970 (outside U
4、SA) 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/ARP5483/3A AEROSPACE RECOMMENDED PRACTICE ARP5483/3 REV. A Issued 2003-03 Revised 2009-12 Sup
5、erseding ARP5483/3 Rolling Element Bearing Axial and Radial Internal Clearance RATIONALE Change: Added missing Tables 2 and 3. 1. SCOPE This test method outlines the standard procedure for measuring the radial and axial internal clearance of rolling element bearings used in airframe controls. 2. REF
6、ERENCES 2.1 Applicable Documents None 2.2 Definitions AXIAL INTERNAL CLEARANCE: The axial distance through which one of the rings may be displaced relative to the other, from one axial extreme position to the opposite extreme position, using a specific gage thrust load exerted parallel to the bearin
7、g axis. RADIAL INTERNAL CLEARANCE: The radial distance through which one of the rings may be displaced relative to the other, from one eccentric position to the diametrically opposite extreme position using a specific gage radial load exerted perpendicular to the bearing axis. 2.3 Order of Precedenc
8、e Text of standards and specifications that reference this test method takes precedence over the text of this document. 3. GENERAL REQUIREMENTS 3.1 Test Apparatus The test fixtures shall be as shown in Figures 1 to 4. Indicator gage forces and gage point radii shall be as shown in Table 1. SAE ARP54
9、83/3A Page 2 of 9 TABLE 1 - INDICATOR GAGE FORCES AND GAGE POINT RADII Basic Bore Diameter d, Inch Over Including Indicator Gage Force Gage Point Radii 0 0.254 Not to exceed 7 Oz. (2N) 0.032 inch (0.8mm) 0.254 0.762 Not to exceed 7 Oz. (2N) 0.098 inch (2.5mm) 0.762 Up Not to exceed 12 Oz. (3.5N) 0.0
10、98 inch (2.5mm) Basic Outside Diamter D, Inch Indicator Gage Force Gage Point Radii All Sizes Not to exceed 7 Oz. (2N) 0.098 inch (2.5mm) 3.2 Test Specimen The quantities of test specimens shall be in accordance with the applicable specification. Only new bearings shall be subjected to this test. 3.
11、3 Disposition After Test Bearings that are not damaged after axial and radial internal clearance tests may be shipped and/or used if within required limits. 4. DETAIL REQUIREMENTS 4.1 Axial Internal Clearance The outer ring of the bearing shall be held rigidly as shown in Figure 1, and tested at a t
12、emperature of 77 F 10 F. With an indicator gage set to record the axial movement of the inner ring, the following steps shall be taken: a. The load specified in Table 2 shall be applied axially to the inner ring. b. While under load, the inner ring shall be oscillated through an angle of 10 to seat
13、the rolling elements. c. When oscillation ceases, the indicator reading shall be taken. d. The specified load shall be applied to the inner ring in the opposite direction. e. Repeat steps b and c. f. The difference in the indicator readings from steps c and e shall be recorded as the axial internal
14、clearance, and shall be within the limits specified in the applicable document. SAE ARP5483/3A Page 3 of 9 FIGURE 1 - Axial Clearance Test TABLE 2 LOADS FOR AXIAL INTERNAL CLEARANCE Bearing Type Load Applied (lbs.) Needle Roller 5.5 Roller 22 Ball 5.5 4.2 Radial Internal Clearance The preferred meth
15、od to determine radial internal clearance for needle roller, ball and roller bearings shall be to measure the components (rolling elements, inner and outer raceway diameters). When that method is not feasible, the following steps shall be taken to measure the radial internal clearance. Testing shall
16、 be performed at a temperature of 77 F 10 F. 4.2.1 Roller and Needle Roller Bearings 4.2.1.1 Mounting of Bearings The bearings shall be mounted for the test as follows: 4.2.1.1.1 Track Roller Bearings The inner ring of bearings shall be held rigidly as shown in Figures 2A and 2B. SAE ARP5483/3A Page
17、 4 of 9 FIGURE 2A - RADIAL CLEARANCE TEST FIGURE 2B - RADIAL CLEARANCE TEST INTEGRAL STUD TYPE BEARINGS SAE ARP5483/3A Page 5 of 9 4.2.1.1.2 Heavy-Duty Needle Roller Bearings The bearings shall be mounted in a ring having an inner diameter equal to the maximum outside diameter shown on the applicabl
18、e document, and the inner ring shall be held rigidly as shown in Figure 3. 4.2.1.1.3 Thin Shell Single Row Bearings The bearings shall be pressed into a ring gage equal in size to the low limit housing bore size shown on the applicable document. The inner ring shall be rigidly held as shown in Figur
19、e 3. 4.2.1.1.4 Self-Aligning Roller Bearings The bearings shall be mounted in a test fixture as shown in Figure 3. FIGURE 3 - RADIAL CLEARANCE TEST NON-TRACK ROLLER NEEDLE BEARINGS AND SELF-ALIGNING BALL AND ROLLER BEARINGS 4.2.1.2 Measuring Radial Internal Clearance With an indicator gage set at th
20、e center of the outer ring or ring gage to record the radial movement, the following steps shall be taken: a. The load specified in Table 3 shall be applied to the outer ring or ring gage. b. While under load, the outer ring shall be oscillated through an angle of 10 to seat the rolling elements. c.
21、 When oscillation ceases, the indicator reading shall be taken. d. The specified load shall be applied to the outer ring or ring gage in the opposite direction. SAE ARP5483/3A Page 6 of 9 e. Repeat steps b and c. f. The difference in the indicator readings from steps c and e shall be recorded as the
22、 radial internal clearance, and shall be within the limits specified in the applicable document. TABLE 3 LOADS FOR RADIAL INTERNAL CLEARANCE Bearing Type Load Applied (lbs.) Track Roller 5.5 Heavy- Duty Needle Roller 5.5 Thin Shell Single Row Needle Roller 5.5 Self-Aligning Roller 22 4.2.2 Ball Bear
23、ings When measuring the radial internal clearance directly employing simple means and without the use of a master bearing, the following procedure shall be used. 4.2.2.1 Use of Shims Fasten the inner ring of the assembled bearing on a horizontal flat plate with a shim as shown in Figure 4. When hand
24、ling small bearings, it is acceptable to use a piece of ordinary writing paper (0.002 to 0.003 inch thick). When handling large bearings, it is acceptable to use 2 to 3 pieces of ordinary writing paper. FIGURE 4 - RADIAL CLEARANCE TEST BALL BEARINGS 4.2.2.2 Seating of Balls Position a sensitive indi
25、cator against the center of the outer ring outside diameter on the middle of the raceway. Hold the outer ring in contact with the rest of the bearing in direction A as shown in Figure 4. With care not to lift the opposite side, move repeatedly at this point up and down and oscillate circumferentiall
26、y (for purpose of moving the balls to the bottom of the raceway) until the indicator gives a maximum reading. 4.2.2.3 Maximum Reading: While continuing to hold the outer ring gently in contact with the rest of the bearing in direction A as shown in Figure 4, move the outer ring at this point first u
27、p and then down without circumferential motion. When the balls pass through the bottom of the raceways, the indicator will show a maximum reading, which shall be recorded. SAE ARP5483/3A Page 7 of 9 4.2.2.4 Seating of Balls (new location) Without changing the general location of the outer ring, perf
28、orm sub-section 4.2.2.2 procedure in direction B until the indicator gives a minimum reading. 4.2.2.5 Minimum Reading Perform sub-section 4.2.2.3 procedure in direction B and record the minimum reading. The difference between the maximum and minimum readings is the radial internal clearance. 4.2.2.6
29、 Several Readings Required To compensate for possible out-of-roundness of the outer ring, repeat the same procedure several times at different angular positions of the outer ring relative to the indicator. To compensate for possible out-of-roundness of the inner ring, repeat the same procedure with
30、this ring at different angular positions in relative to the indicator. Take the average of several readings as the clearance of the bearing. NOTE: If the indicator needle does not pass through a clear maximum or minimum reading, respectively, the shim is probably too thin. 4.2.2.7 Large Bearings Whe
31、n handling large and heavy bearings, it is helpful to insert three flat pieces, each about 1/2 inch (12.7 mm) thick, between the flat plate and both bearing rings to allow room for the operators fingers. These pieces shall be located radially with two of them relatively close together, one on each s
32、ide of the indicator point, and the third directly opposite the indicator. The paper shims, in this case, shall be placed between the inner ring and these pieces. 4.2.2.8 Small Bearings When handling small bearings, it is helpful to use a rubber tipped stick for moving the outer ring. 4.2.3 Roller B
33、earings For self-aligning roller bearings, the test bearing shall be mounted in a test fixture as shown in Figure 3 and the following steps shall be taken: a. A 22 pound radial load shall be applied to the outer ring. b. While under load, the ring shall be oscillated through an angle of 10 to seat t
34、he rolling elements. c. When oscillation ceases, the indicator reading shall be taken. d. A 22 pound radial load shall be applied to the outer ring in the opposite direction. e. Repeat steps b and c. The difference in indicator readings between step c and e shall be the radial internal clearance. Th
35、e radial internal clearance shall be within the limits specified on the applicable document. SAE ARP5483/3A Page 8 of 9 5. DOCUMENTATION 5.1 Test Parameters The following parameters shall be specified in the individual specification or standard: a. Shaft and housing configuration b. Internal clearan
36、ce limits c. Failure criteria (breakage, tolerance, etc.) 5.2 Test Data The following information shall be recorded in report format: 5.2.1 Bearing Description a. Part Number b. Lot Identification c. Manufacturer 5.2.2 Test Equipment a. Equipment Name, Model Number, and Serial Number b. Calibration
37、Data c. Operator Name d. Date tested 5.2.3 Results a. Requirements b. Measured values c. Measurement Units 5.2.4 Failures or Problems a. Description of failures b. Corrective action taken c. Description of any malfunction resulting in an invalid or interrupted test. SAE ARP5483/3A Page 9 of 9 6. NOT
38、ES 6.1 Intended Use This test method is intended to provide a means for evaluating the axial and radial internal clearance of rolling element bearings. 6.2 Method of Reference The test method shall be referenced in general and detailed specifications, standards, or drawings for airframe bearings. Sp
39、ecific test and data requirements are given in the applicable document. The following statement shall be used to reference this test method: The bearings shall be tested in accordance with ARP5483/3. 6.3 A change bar (I) located in the left margin is for the convenience of the user in locating areas
40、 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 SAE COMMITTEE ACBG, AIRFRAME CONTROL BEARINGS
