1、 Tapered Roller Bearings, Radial Inch Design ANSI/ABMA 19.2:2013 Secretariat American Bearing Manufacturers Association ANSI/ABMA 19.2:2013 Revision of ANSI/ABMA 19.2:1994 Accredited Standards Committee B3 ii AMERICAN NATIONAL STANDARD (This is not an approved part of the standard) Approval of an Am
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7、ww.ANSI.org. Published by American Bearing Manufacturers Association 2025 M Street, N.W., Suite 800 Washington, DC 20036 Copyright 2013 by American Bearing Manufacturers Association All rights reserved. No part of this publication may be reproduced in any form, in an electronic retrieval system or o
8、therwise, without prior written permission of the publisher. Printed in the United States of America iii Tapered Roller Bearings Radial Inch Design CONTENTS SECTION PAGE 1. Scope 1 2. Part Numbering Systems 1 2.1 Identification Code 1 2.2 ABMA Standard 19.2 Designation System . 1 3. Symbols and Nome
9、nclature 5 3.1 Dimension Symbols 6 3.2 Cone and Cup Chamfer Dimensions 7 4. Boundary Dimensions . 9 4.1 General . 9 4.2 Cup Small Inside Diameter . 9 4.3 Cup Large Inside Diameter . 9 4.4 Contact Angle 9 4.5 Cage Axial Clearance . 9 4.6 Effective Load Center . 9 4.7 Bearing Assembly Types 9 4.8 Spac
10、ers . 9 5. Tolerances 30 5.1 General . 30 5.2 Component Stand Gauging and Overall Bearing Width Tolerance 30 5.3 Tolerance Classes 33 5.4 Tolerance Symbols . 33 6. Fitting Practices 37 6.1 Scope 37 6.2 Surface Finish of Bearing Seats . 37 6.3 Definition of Operating Characteristics . 37 6.4 Heavy Du
11、ty Fitting Practice for Shafts 37 6.5 Heavy Duty Fitting Practice for Precision Bearings 37 Appendix Appendix A Previous Part Numbering System of Tapered Roller Bearings Radial, Inch Design 41 List of Tables . iv List of Figures iv iv LIST OF TABLES TABLE NUMBER PAGE 1. Bearing Assembly Types 10 2.
12、Spacer Type Designations 10 3. Type TS Boundary Dimensions 11 4. Type TSF Boundary Dimensions 21 5. Type TDI Boundary Dimensions . 25 6. Type TDO, TDOCD Boundary Dimensions 27 7. Bearing Tolerances . 34 8. Recommended Fitting Practices . 38 LIST OF FIGURES FIGURE NUMBER PAGE 1. Single-row Tapered Ro
13、ller Bearing Nomenclature . 5 2. Boundary Dimension Symbols 5 3. Chamfer Symbols . 7 4. Special Cone Back Face Compound Radius 8 5. TDO Assembly 27 6. TDOCD Assembly . 27 7. Single Cup, High Stand, Back face, Non-flanged . 32 8. Single Cup, Low Stand, Back face, Non-flanged 32 9. Single Cup, High St
14、and, Back face, Flanged 32 10. Single Cup, Low Stand, Back face, Flanged 32 11. Double Cup, Stand over Double Plugs . 32 12. Single Cone, High Stand, Back face . 32 13. Single Cone, Low Stand, Back face . 32 14. Double Cone, Stand over Master Cups 32 1 Tapered Roller Bearings Radial Inch Design 1. S
15、COPE This standard covers inch design radial tapered roller bearings of various types, part numbering systems, boundary dimensions, tolerances, and fitting practices. Tapered roller thrust bearings are covered in a separate ABMA standard. General ABMA standards which apply to various types of bearin
16、gs should be consulted for tolerance definitions, gauging practices, mounting accessories, and method of evaluating load ratings. 2. PART NUMBERING SYSTEMS 2.1 Identification Code. Inch design tapered roller bearings are numbered in an identical manner or reference is made to the universal number by
17、 all producers. Therefore, an identification code for the use of bearing users to provide a universal language for describing and identifying these products is not required. 2.1.1 Individual Component Part Numbers. Unlike other bearing types, tapered roller bearing cones and cups are individually nu
18、mbered. The cone is assembled with rollers and a cage, and when used with a cup, makes a complete bearing assembly. Both cone and cup numbers are required to identify a complete bearing assembly. The cone number followed by the cup number is the preferred practice. 2.2 ABMA Standard 19.2 Designation
19、 System. The current part numbering system for tapered roller bearings attempts to describe each bearing on the basis of dimensional and functional interchangeability. The system has been in use since 1950. Another system for bearings designated prior to 1950 is described in Appendix A. 2.2.1 Genera
20、l Arrangement. The cone and cup part numbers, consisting of prefix letters, numerical designators, and suffix letters, are divided into five sections as shown below and described in the following paragraphs. COMPONENT PART NUMBER Section 1 Section 2 Section 3 Section 4 Section 5 Series Prefix Angle
21、Code Basic Series Component Number Modification Suffix HM 9 032 49 A HM 9 032 10 2 2.2.2 Section 1 Series Prefix. The series prefix consists of one or two letters which designate the duty class of the series based on the 1948 radial capacity formula. A complete list of prefixes and their designation
22、 follows; Series Prefix Series Designation EH Extra Heavy Series EL Extra Light Series H Heavy Series HH Heavier than Heavy Series HM Heavy-Medium Series L Light Series LL Lighter than Light Series LM Light-Medium Series M Medium Series J Indicates a metric component. Refer to ABMA standard 19.1. A
23、prefix other than shown above, or the absence of a prefix, indicates the original part numbering system. Refer to Appendix A. 2.2.3 Section 2 Angle Code. The 1st digit following the series prefix is an indicator of the angularity of the bearing series according to the following code. Included Cup An
24、gle Code 0 to 23 59 59.99” 1 24 to 25 29 59.99” 2 25 30 to 26 59 59.99” 3 27 to 28 29 59.99” 4 28 30 to 30 29 59.99” 5 30 30 to 32 29 59.99” 6 32 30 to 35 59 59.99” 7 36 to 44 59 59.99” 8 45 and over, excluding thrust 9 2.2.4 Section 3 Basic Series. The 2nd, 3rd, and 4th digits following the series
25、prefix letters are reserved for the basic series indication, which can be indicated by one digit, or by two digits, or by three digits. It can be indicated by a single digit 0 to 9 inclusive, or by a double digit 00 to 99 inclusive, or by a triple digit 000 to 999 inclusive. The basic series indicat
26、ion is related to the diameter of the cone raceway at the small end of the roller, in order that smaller numbers will indicate smaller sizes of bearings and larger numbers will indicate larger sizes of bearings. For the present, the series numbers indicated by the absence of any digit or by the sing
27、le digit 0 to 9 inclusive are reserved for future development of extremely small sized tapered roller bearings, if required. Likewise, the numbers 900 to 999, inclusive, are reserved for future development of extremely large bore tapered roller bearings, if required. 3 The selection of the basic ser
28、ies indication in relation to the cone raceway diameter at the roller small end is in accordance with the following tabulation. Cone Raceway Diameter at the Roller Small End (inches) Basic Series Indication Cone Raceway Diameter at the Roller Small End (inches) Basic Series Indication Over Incl. Ove
29、r Incl. 0 1 00 - 19 incl. 15 16 640 - 659 incl. 1 2 20 - 99 incl. 16 17 660 - 679 incl. 000 - 029 incl. 17 18 680 - 694 incl. 2 3 030 - 129 incl. 18 19 695 - 709 incl. 3 4 130 - 189 incl. 19 20 710 - 724 incl. 4 5 190 - 239 incl. 20 21 725 - 739 incl. 5 6 240 - 289 incl. 21 22 740 - 754 incl. 6 7 29
30、0 - 339 incl. 22 23 755 - 769 incl. 7 8 340 - 389 incl. 23 24 770 - 784 incl. 8 9 390 - 429 incl. 24 25 785 - 799 incl. 9 10 430 - 469 incl. 25 30 800 - 829 incl. 10 11 470 - 509 incl. 30 35 830 - 859 incl. 11 12 510 - 549 incl. 35 40 860 - 879 incl. 12 13 550 - 579 incl. 40 50 880 - 889 incl. 13 14
31、 580 - 609 incl. 50 72.5 890 - 899 incl. 14 15 610 - 639 incl. 2.2.5 Section 4 Component Number. The last two numeric digits indicate the part number of the bearing component. Roller numbers are indicated by the digits 01 to 04, inclusive, but these numbers do not appear on the bearings. They are us
32、ed for manufacturing identification. Cage numbers are indicated by the digits 05 to 09, inclusive. These numbers do not appear on the bearings. They are used for manufacturing identification. Cup numbers are indicated by the digits 10 to 19, inclusive, the first cup made to minimum section (minimum
33、OD) in any series starting with the number 10. If more numbers are required in any series, numbers 20 to 29 are utilized where available. Cone numbers are indicated by the digits 30 to 49, inclusive, the first cone made to minimum section (maximum bore) in any series being numbered 49. If more numbe
34、rs are required for the cones in any one series, numbers 29 to 20 are utilized where available. The numbers 20 to 29 are, therefore, reserved for cone and cup number overflow. The numbers 50 to 99 are reserved for additional overflow in the case of an extremely crowded series. Any major change in a
35、series involving new part numbers which are not interchangeable with the old is accommodated through the use of this upper range of numbers. 4 2.2.6 Section 5 Modification Suffix. Following the numbers identifying the bearing component, there may be a suffix. The suffix consists of one, two, or thre
36、e letters which designate type or external modification from the basic number according to the following tabulation. Modification Suffix Cone or Cup Explanation A Cone & Cup Different bore, OD, width or radius from basic part number. AB Cup Flanged cup. AS Cone & Cup Different bore, OD, width or rad
37、ius from basic part number. AX Cone & Cup Different bore, OD, width or radius from basic part number. B Cup Flanged cup. B Cone Cone using a brass cage. CD Cup Double cup with lubrication groove and holes, one hole counterbored to accept recommended locking pin. D Cone & Cup Double cone or double cu
38、p with lubrication groove and holes. DC Cup Double cup with lubrication hole counterbored to accept recommended locking pin. NA Cone Non-Adjustable. Two single cones with front faces contacting, mated with a double cup to form a double row bearing with internal clearances pre-set. NW Cone “NA” type
39、cone with slotted front face. S Cone & Cup Different bore, OD, width or radius from basic part number. SW Cone & Cup Slot or keyway. T Cone Tapered bore. TD Cone Tapered bore double cone. W Cone & Cup Slot or keyway. X Cone & Cup Different bore, OD, width or radius from basic part number. XB Cup Fla
40、nged cup. XD Cone & Cup Double cone or double cup without lubrication groove and holes. XE Cup Different OD, width or radius from basic part number. YD Cup Double cup with lubrication hole but no groove. 2.2.7 Spacer Part Numbering. Multi-row bearing assembly types may use spacers between the cones
41、and/or cups. These spacers generally carry the same basic part number as the cone or cup, with a suffix which is assigned sequentially and has no significance in describing the spacer type. 5 3. SYMBOLS AND NOMENCLATURE The symbols shown in Figure 2 and the values given in the Boundary Dimension Tab
42、les 3 to 6 refer to nominal dimensions unless otherwise specified. Figure 1 Single-row Tapered Roller Bearing Nomenclature TS TSF TDI TDO TDOCD Figure 2 Boundary Dimension Symbols 6 3.1 Dimension Symbols. B = cone width C = cup width C2 = cup flange width D = cup outside diameter D1 = cup flange out
43、side diameter d = cone bore diameter E = cup small inside diameter F = cup large inside diameter G = double cup, OD counterbore diameter, CD cup type H = double cup, OD counterbore depth, CD cup type r = cone back face chamfer dimension r1 = cup back face chamfer dimension r2 = cone and cup front fa
44、ce chamfer dimension T = bearing width = contact angle 7 3.2 Cone and Cup Chamfer Dimensions Figure 3 Chamfer Symbols rs min = smallest permissible single chamfer dimension of cone back face rs max = largest permissible single chamfer dimension of cone back face r1s min = smallest permissible single
45、 chamfer dimension of cup back face r1s max = largest permissible single chamfer dimension of cup back face r2s min = smallest permissible single chamfer dimension of cone or cup front face r2s max = largest permissible single chamfer dimension of cone or cup front face In order to ensure that taper
46、ed roller bearing chamfers are compatible with the dimensions of parts which come into contact with the rolling bearings, values of the chamfer dimension limits are required, of which the minimum limit is of primary interest to the bearing user and application designer. The exact shape of the chamfe
47、r surface is not specified, but its contour in an axial plane shall not be allowed to project beyond the imaginary circular arc, of radius rs min, r1s min or r2s min tangential to the ring face and the bore or outside cylindrical surface of the ring. Refer to Figure 3. The largest single shaft or ho
48、using radius must not exceed the smallest single chamfer dimension of the cone or cup. No values are given in this standard for the single cone or single cup front face chamfer dimension r2, however, the front face corners shall not be sharp. 8 3.2.1 Special Cone Back Face Compound Radius Design. Ce
49、rtain cone part numbers listed in the Boundary Dimension Tables (3-6) incorporate a special compound radius design at the back face. Details of the radius design, and the affected part numbers are shown below. Figure 4 Special Cone Back Face Compound Radius Cone Part Number Minimum Chamfer rs min Minimum Radius ra min Minimum Radius rb min Chamfer Angle Radial Direction Axial Direction LM67048 0.140 0.
