1、BRITISH STANDARD BS ISO 2790:2004 Belt drives V-belts for the automotive industry and corresponding pulleys Dimensions ICS 43.060.10 BS ISO 2790:2004 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 7 July 2005 BSI 7 July 2005 ISBN 0 580 45933
2、 0 National foreword This British Standard reproduces verbatim ISO 2790:2004 and implements it as the UK national standard. The UK participation in its preparation was entrusted to Technical Committee MCE/10, Belts and pulley drives, which has the responsibility to: A list of organizations represent
3、ed on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using th
4、e “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from l
5、egal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed; monitor related international and European developments and promulgate them in the UK. Sum
6、mary of pages This document comprises a front cover, an inside front cover, the ISO title page, pages ii to iv, pages 1 to 7 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsIN
7、TERNATIONAL STANDARD ISO 2790 Fourth edition 2004-09-15 Reference number ISO 2790:2004(E) Belt drives V-belts for the automotive industry and corresponding pulleys Dimensions Transmissions par courroies Courroies trapzodales pour la construction automobile et poulies correspondantes DimensionsBS ISO
8、 2790:2004ii BS ISO 2790:2004iii Contents Page 1 Scope 1 2 Normative references 1 3 Terms, definitions and symbols . 1 4 Belts 1 4.1 General . 1 4.2 Cross-section and pitch zone 1 4.3 Measurement of the effective length of a belt and its ride-out . 2 4.4 Centre distance variations . 4 5 Service pull
9、eys . 4 5.1 Dimensions 4 5.2 Checking of effective diameter 6 5.3 Designation 7 BS ISO 2790:2004iv Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally c
10、arried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the wor
11、k. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare Inter
12、national Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of th
13、e elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO2790 was prepared by Technical Committee ISO/TC41, Pulleys and belts (including veebelts), Subcommittee SC 1, Friction. This fourth edition cancels and
14、 replaces the third edition (ISO 2790:1989), subclauses 4.1, 4.2 and 5.1, Tables 1, 2, 4 and 5, of which have been technically revised and a new Figure 5 added. BS ISO 2790:20041 Belt drives V-belts for the automotive industry and corresponding pulleys Dimensions 1S c o p e This International Standa
15、rd specifies the requirements for belts and pulleys for V-belt drives used for driving auxiliaries of internal combustion engines for the automotive industry. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only
16、the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 1081, Belt drives V-belts and V-ribbed belts, and corresponding grooved pulleys Vocabulary ISO 8370-1:1993, Belt drives Dynamic test to determine pitch zone locati
17、on Part 1: V-belts ISO 9608, V-belts Uniformity of belts Test method for determination of centre distance variation 3 Terms, definitions and symbols For the purposes of this document, the terms, definitions and symbols relating to drives using V-belts (i.e. belts and grooved pulleys) defined in ISO
18、1081 apply. 4B e l t s 4.1 General A belt is defined by its cross-section (groove profile AV 10 to AV 17) and by its effective length, in millimetres, measured under specified conditions. 4.2 Cross-section and pitch zone A cross-section of a belt is defined by the nominal top width, (see Figure 1 an
19、d Table 1). The position of the belt pitch zone in the pulley groove is defined by the effective line differential, (see Figure 4 and Table 1). The nominal belt included angle is unless agreed otherwise between customer and belt manufacturer. w b e 40 BS ISO 2790:20042 4.3 Measurement of the effecti
20、ve length of a belt and its ride-out Set the belt up on two identical pulleys, having the dimensions shown in Table 2 and mounted on a horizontal bench, and apply to the sliding pulley the measurement tension (see Figure 2). Rotate the belt at least twice to seat it properly. The effective length of
21、 the belt, , is given by the equation: where is the measured maximum centre distance of the pulleys; is the measured minimum centre distance of the pulleys; is the effective circumference of one pulley: The ride-out, , of the belt (see Figure 3) shall be such that: for each type of belt. a Notched (
22、optional). Figure 1 Profile of the belt Table 1 Dimensions of belt cross-sections Dimensions in millimetres Parameter Symbol AV 10 AV 13 AV 17 Wrapped belt Raw-edged belt Wrapped belt Raw-edged belt Wrapped belt Raw-edged belt Nominal top width 10 10 13 13 17 17 Effective line differential aaaaaa a
23、Values of for the different types of belt are not standardized. They can be determined in accordance with ISO 8370-1:1993, 7.2. w b e b e F L e L e =E max +E min +C e E max E min C e C e =d e = 300 mm f 0f2,4 mm BS ISO 2790:20043 Key 1 sliding pulley Figure 2 Measuring device Figure 3 Groove for mea
24、suring V-belts Table 2 Dimensions of checking pulley and measuring force Parameter Symbol Unit Groove profiles AV 10 AV 13 AV 17 Groove angle degrees Effective diameter mm 95,49 95,49 95,49 Outside diameter mm Diameter of balls or rods for checking the pulley grooves mm Distance from external tangen
25、t planes to ball or rods mm Minimum depth of groove mm 11 13,75 16 Te n s i o n a N 267 267 356 a The tension on each strand of the belt shall be equal to one half of the values shown. 36 0 1036 0 1034 0 10d e d o 95,5 0,2 95,5 0,2 95,5 0,2 d 7,95 0 0,025 11,124 0 0,025 14,288 0 0,025 K 99,31 0,05 1
26、03,53 0,05 103,71 0,05 P F BS ISO 2790:20044 4.4 Centre distance variations Centre distance variations are given in relation to the belt top width given in Table 3. They are determined in accordance with ISO 9608. 5 Service pulleys 5.1 Dimensions The dimensions of service pulleys are shown in Figure
27、s 4 and 5 and given in Tables 4 and 5. The demands of modern accessory drives often make it necessary to use belts in sets. The dimensions of the grooves and groove spacings shown are for multiple belt drives or drives using joined belts. Table 3 Centre distance variations Dimensions in millimetres
28、Belt length Top width Over Up to (inclusive) 1 0 0 01 , 2 1 000 2 000 1,6 2 000 5 000 2 5 000 2,5 Tolerances of axial and radial run-out in millimetres Key is the pitch diameter Figure 4 Groove for service pulley w 25 E d p BS ISO 2790:20045 Table 4 Dimensions of grooved pulleys Dimensions in millim
29、etres, angles in degrees Parameter Symbol Groove profiles AV 10 AV 13 AV 17 Effective width of groove 9,7 12,7 16,8 Groove angle a Minimum groove depth 11 13,75 16 Minimum curved radius of sides at top of groove 0,8 0,8 0,8 The sides of the groove shall be smooth. The axial and radial run-outs shall
30、 be measured separately as the total indicator reading of the movement of the ball mounted under spring pressure, to follow the groove as the pulley is rotated. The optional bottom corner radii, if used, shall be below the depth . The axis of symmetry of any cross-section of the groove shall make an
31、 angle of , with a maximum deviation of , with a half-plane passing through the axis of the pulley. a For pulley diameters less than , and respectively for AV 10, AV 13 and AV 17, it is recommended that the groove angle be reduced to . Tolerances of axial and radial run-out in millimetres Figure 5 M
32、ultigrooved pulleys w e 36 0 3036 0 3036 0 30P r P 90 2 57 mm 70 mm 102 mm 34 d o d e 1,4 mm BS ISO 2790:20046 5.2 Checking of effective diameter Place two balls or rods, the diameters of which are shown in Table 6, in contact with the groove to be checked and displaced by . Then measure the distanc
33、e between the external tangent planes to the balls or rods and parallel to the axis of the pulley. The effective diameter shall be such that:does not vary more than In the case of each groove in a multigrooved pulley of the same nominal dimensions, the distance over balls shall not vary from groove
34、to groove by more than:per of diameter with a top limit of:for diameters and above. Table 5 Dimensions of multigrooved pulleys Dimensions in millimetres, angles in degrees Parameter Symbol Groove profiles AV 10 AV 13 AV 17 Effective width of groove 9,7 12,7 16,8 Groove angle Minimum groove depth 11
35、13,75 16 Minimum curved radius of sides at top of groove 0,8 0,8 0,8 Ball diameter Corrective term 3,8 8 8,21 Groove pitch Centre of groove to face The sides of the groove shall be smooth. The axial and radial run-outs shall be measured separately as the total indicator reading of the movement of th
36、e ball mounted under spring pressure, to follow the groove as the pulley is rotated. The optional bottom corner radii, if used, shall be below the depth . The axis of symmetry of any cross-section of the groove shall make an angle of , with a maximum deviation of , with a half-plane passing through
37、the axis of the pulley. NOTE The sum tolerance on the groove pitch, , for more than 2 grooves is . Table 6 Dimensions of balls or rods Dimensions in millimetres Parameter Symbol Groove profiles AV 10 AV 13 AV 17 Diameter of balls or rods Corrective term 3,8 8 8,21 w e 36 0 3036 0 3036 0 30P r d 7,95
38、 0 0,025 11,124 0 0,025 14,288 0 0,025 2x e 12,6 0,3 15,9 0,3 21,36 0,4 f 8 0,6 10 0,6 15 0,8 P 90 2 e 0,6 mm 180 d 7,95 0 0,025 11,124 0 0,025 14,288 0 0,025 2x K d e =K 2x d e + 2x 0,6 mm K 0,01 mm 5 mm 0,3 mm 152 mm BS ISO 2790:20047 5.3 Designation A pulley is designated by: the effective diamet
39、er, , expressed in millimetres; the number of grooves; the groove profile (AV 10, AV 13 or AV 17). EXAMPLE (effective diameter number of grooves profile) In the case of integral pulleys with different grooves: successive designation of the elements: d e 671A V10 901A V13 671A V10 BS ISO 2790:2004BS
40、ISO 2790:2004 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions Bri
41、tish Standards are updated by amendment or revision. Users of British Standards should make sure that they possess the latest amendments or editions. It is the constant aim of BSI to improve the quality of our products and services. We would be grateful if anyone finding an inaccuracy or ambiguity w
42、hile using this British Standard would inform the Secretary of the technical committee responsible, the identity of which can be found on the inside front cover. Tel: +44 (0)20 8996 9000. Fax: +44 (0)20 8996 7400. BSI offers members an individual updating service called PLUS which ensures that subsc
43、ribers automatically receive the latest editions of standards. Buying standards Orders for all BSI, international and foreign standards publications should be addressed to Customer Services. Tel: +44 (0)20 8996 9001. Fax: +44 (0)20 8996 7001. Email: ordersbsi-. Standards are also available from the
44、BSI website at http:/www.bsi-. In response to orders for international standards, it is BSI policy to supply the BSI implementation of those that have been published as British Standards, unless otherwise requested. Information on standards BSI provides a wide range of information on national, Europ
45、ean and international standards through its Library and its Technical Help to Exporters Service. Various BSI electronic information services are also available which give details on all its products and services. Contact the Information Centre. Tel: +44 (0)20 8996 7111. Fax: +44 (0)20 8996 7048. Ema
46、il: infobsi-. Subscribing members of BSI are kept up to date with standards developments and receive substantial discounts on the purchase price of standards. For details of these and other benefits contact Membership Administration. Tel: +44 (0)20 8996 7002. Fax: +44 (0)20 8996 7001. Email: members
47、hipbsi-. Information regarding online access to British Standards via British Standards Online can be found at http:/www.bsi- Further information about BSI is available on the BSI website at http:/www.bsi-. Copyright Copyright subsists in all BSI publications. BSI also holds the copyright, in the UK
48、, of the publications of the international standardization bodies. Except as permitted under the Copyright, Designs and Patents Act 1988 no extract may be reproduced, stored in a retrieval system or transmitted in any form or by any means electronic, photocopying, recording or otherwise without prior written permission from BSI. This does not preclude the free use, in the course of implementing the standard, of necessary details such as symbols, and size, type or grade designations. If these details are to be used for any other purpose than implementation then t
