BS ISO 2790-2005 Belt drives - V-belts for the automotive industry and corresponding pulleys - Dimensions《带传动 汽车工业用V带及带轮 尺寸》.pdf

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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

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