1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA
2、NET SYSTEM only. Unless specific permission has been granted, this document MAY NOT be sent or given to staff members from other companies or organizations. Doing so would constitute a VIOLATION of SABS copyright rules. 2. Indemnity The South African Bureau of Standards accepts no liability for any
3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. ICS 21.100.10 ISBN 0-626-16534-2 SANS 2795:2005Edition 1ISO 2795:1991Edition 4SOUTH AFRICAN NATIONAL STANDARD Plain bearings Sintered bushes Dimensions a
4、nd tolerances This national standard is the identical implementation of ISO 2795:1991 and is adopted with the permission of the International Organization for Standardization. Published by Standards South Africa 1 dr lategan road groenkloof private bag x191 pretoria 0001 tel: 012 428 7911 fax: 012 3
5、44 1568 international code + 27 12 www.stansa.co.za Standards South Africa SANS 2795:2005 Edition 1 ISO 2795:1991 Edition 4 Table of changes Change No. Date Scope Abstract Specifies the dimensions and tolerances applicable to sintered bearings for specific ranges of inside diameters. Keywords bearin
6、gs, dimensional tolerances, dimensions, plain bearings, sintered products. National foreword This South African standard was approved by National Committee StanSA TC 5120.02, Bearings, in accordance with procedures of Standards South Africa, in compliance with annex 3 of the WTO/TBT agreement. INTER
7、NATIONAL STANDARD IS0 2795 Fourth edition 1991-1 l-01 - Plain bearings - Sintered bushes - Dimensions and tolerances Paliers lisses - Coussinets fritths - Dimensions et tolhar7ces - - - - - -.-y-y _._ _ _ _._. - -. - Reference number IS0 2795:1991(E) IS0 2795:1991(E) Foreword IS0 (the International
8、Organization for Standardization) is a worldwide federation of national standards bodies (IS0 member bodies). The work of preparing International Standards is normally carried out through IS0 technical committees. Each member body interested in a subject for which a technical committee has been esta
9、blished has the right to be represented on that committee. International organizations, govern- mental and non-governmental, in liaison with ISO, also take part in the work. IS0 collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electr-otechnical standard
10、ization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an lnter- national Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard IS0 2795 was prepared by Technical Comm
11、ittee ISO/TC 123, Plain bearings, Sub-Committee SC 3, Dimensions, toler- ances and construction details. This fourth edition cancels and replaces the third edition (IS0 2795:1986), of which it constitutes a minor revision. 0 IS0 1991 All rights reserved. No part of this publication may be reproduced
12、 or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. International Organization for Standardization Case Postale 56 l Cl-i-1211 Genkve 20 l Switzerland Printed in Switzerland ii IS0 2795:1991(E) In
13、troduction The sizes given in this International Standard are based on a range of shaft diameters which are considered to correspond to the requirements of industry. For all except the smallest sizes, a thin-wall series is pro- vided in addition to the normal series in order to introduce an element
14、of choice and, more importantly, to provide for the possibility of the same sizes being adopted for plain bearings made from other materials. It is envisaged that as far as possible the same outside diameters will be recommended for all types of plain bearings. . . . III This page intentionally left
15、 blank . INTERNATIONAL STANDARD IS0 2795:1991 (E) Plain bearings - Sintered bushes - Dimensions and tolerances 1 Scope This International Standard specifies the dimensions and tolerancesl) applicable to sintered bearings for the following ranges of inside diameters: - Cylindrical bearings: 1 mm to 6
16、0 mm - Flanged bearings: 1 mm to 60 mm - Spherical bearings: 1 mm to 20 mm 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publi- cation, the editions indicated were valid. A
17、ll stan- dards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of ap- plying the most recent editions of the standards in- dicated below. Members of IEC and IS0 maintain registers of currently valid International S
18、tandards. IS0 28641988, ISO system of limits and fits - Part I: Bases of tolerances, deviations and fits. IS0 286-23988, IS0 system of limits and fits - Part 2: Tables of standard tolerance grades and limit deviations for ho/es and shafts. IS0 5755-13987, Sintered metal materials - Specifi- cations
19、- Part 1: Materials, for bearings, impregnated with liquid lubricant. 3 Materials Materials used for manufacturing sintered bearings shall conform to IS0 5755-l. 4 Cylindrical bearings 4.1 Dimensions See figure 1 and tables I and 2. -.-_ 1) See IS0 286-l and IS0 286-2 for the limit deviations and to
20、lerance grades specified in this International Standard. IS0 2795:1991 (E) I .o b orf2 A* Inside diameter n l- Outside diameter, I T Length11 Normal series Thin series2) L 1 3 - l-2 195 4 - l-2 2 5 - 2-3 23 6 - 2-3 3 6 5 3-4 4 8 7 5 9 8 6 10 9 7 11 10 8 12 11 9 14 12 10 16 14 12 18 16 14 20 18 15 21
21、 19 16 22 20 18 24 22 - 3-4-6 4-5-8 4-6-10 5-8-10 6-8-12 6-10-14 8-10-16 8-12-20 10-14-20 10-15-25 12-16-25 12-18-30 20 26 25 15-20-25-30 22 28 27 15-20-25-30 25 32 30 20-25-30-35 28 36 33(34) 20-25-30-40 30 38 35(36) 20-25-30-40 32 40 38 20-25-30-40 35 45 41 25-35-40-50 38 48 44 25-35-45-55 40 50 4
22、6 30-40-50-60 42 52 48 30-40-50-60 45 55 51 35-45-55-65 48 58 55 35-50-70 50 60 58 35-50-70 55 65 63 40-55-70 60 72 68 50-60-70 Figure 1 Table 1 Dimensions in m llimetres 1) As from inside diameter 20 mm (included), the last value for the length is not applicable to the thin series. 2) Dimensions in
23、 parentheses shall be used as “2nd choice”. Table 2 Dimensions in miliimetres Wall thickness D-d 2 Chamfer C above up to and incl. max. 1 072 2 03 3 094 4 076 5 017 -.- 018 4.2 Tolerances The tolerances on the bearings after fitting and the tolerances on the housing and insertion pin are given below
24、. In addition, tolerances on the inside and outside diameters of the bearing before fitting are given. NOTE 1 Since the actual tolerances and combinations of tolerances in the as-delivered state depend upon the characteristics of the materials and the manufacturing methods, they should be discussed
25、with the manufacturer. As-delivered: - on outside diameter D: in the ranges r6 to s7, for D s 50 mm r7 to s8, for I 50 mm - on inside diameter n: in the ranges F7 to G7, for II) 50 mm - on bearing length I,: js13 - on coaxiality of the outside diameter with respect to the inside surface diameter (to
26、lerance based on the outside diameter, 11): t1 = IT 9 for II 50 mm Insertion pin: in the range m5 to m6 Housing: H7 Bearing bore after fitting (assuming the housing is rigid): H7, for D 50 mm IS0 2795:1991(E) 5 Flanged bearings Table 3 Dimensions in millimetres 5.1 Dimensions See figure2 and tables
27、3 to 5. Figure 2 Inside Outside Flange Flange diameter diameter diameter thickness Length d I3 11 e L Normal series 1 115 2 235 3 3 5 4 6 -I- 5 a 6 9 6 9 4 a 12 5 9 13 6 IO 14 7 11 15 a 12 16 9 14 19 10 16 22 12 ia 24 14 20 26 15 21 27 16 22 28 ia 24 30 2 2 295 3 3 3 3 3 3 3-4-6 4-5-8 4-6-10 5-a-10
28、6-8-12 6-10-14 8-10-16 8-12-20 10-14-20 10-15-25 12-16-25 12-18-30 20 26 32 3 15-20-25-30 22 28 34 3 15-20-25-30 25 32 39 395 20-25-30 28 36 44 4 20-25-30 30 38 46 4 20-25-30 32 40 48 4 20-25-30 35 45 55 5 25-35-40 38 48 58 5 25-35-45 40 50 60 5 30-40-50 42 52 62 5 30-40-30 45 55 65 5 35-45-55 48 58
29、 68 5 35-50 50 60 70 5 35-50 55 65 75 5 40-55 60 72 84 6 50-60 10 14 18 12 16 20 14 18 22 15 19 23 16 20 24 18 22 26 20 25 30 295 15-20-25 22 27 32 295 15-20-25 25 30 35 275 20-25-30 Thin series - 8-10-16 8-12-20 10-14-20 10-15-25 12-16-25 12-18-30 IS0 2795:1991(E) Table 4 Dimensions in millimetres
30、Wall thickness D-d 2 Chamfer c above up to and incl. max. -. 1 072 1 2 03 2 3 074 3 4 076 4 5 077 5 - 03 Table 5 Dimensions in millimetres Outside diameter L3 above up to and inch _- 12 12 30 30 - r max. 073 076 078 5.2 Tolerances The tolerances on the bearings after fitting and the tolerances on th
31、e housing and insertion pin are given below. In addition, tolerances on the inside and outside diameters of the bearing and on the flange before fitting are given. NOTE 2 Since the actual tolerances and combinations of tolerances in the as-delivered state depend upon the characteristics of the mater
32、ials and the manufacturing methods, they should be discussed with the manufacturer. As-delivered: - on outside diameter II: in the ranges r6 to s7, for I 50 mm - on inside diameter d: in the ranges F7 to G7, for I) 50 mm - on bearing length 1,: js13 - on flange diameter D,: js13 - on flange thicknes
33、s e: js13 - on coaxiality of the outside diameter with respect to the inside surface diameter (tolerance based on the outside diameter, 1): 4 = IT 9, for 11 50 mm Insertion pin: in the range m5 to m6 Housing: H7 Bearing bore after fitting (assuming the housing is rigid): H7, for D 50 mm IS0 2795:199
34、1(E) 6 Spherical bearings 6.1 Dimensions See figure 3 and table 6. Figure 3 NOTE 3 A cylindrical surface is permissible on the sphere at the centre of the bearing length, the diameter of which should be agreed between the user and the manufacturer. Table 6 Dimensions in millimetres Inside Spherical
35、diameter diameter d 4 Length L Chamfer C max. 1 195 2 2,5 3 4 5 6 7 8 9 10 IO 12 14 15 16 18 20 3 495 5 6 8 IO - 12 - 14 16 16 18 20 22 22 24 27 28 30 36 I 25 093 095 6.2 Tolerances Inside diameter, d: H7 Spherical diameter, D,: hll Bearing length, I,: js13 Tolerance for the housing diameter should normally be HI0 but this depends on the method of assembly. Where an easier fit is preferred for lighter self- alignment, GIO is suggested. Standards South AfricaThis s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .
