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1、STD-IS0 SOLL-ENGL 1797 4851903 0705q74 Sqb W I NT E R NAT I O N AL STANDARD IS0 901 1 Second edition 1997-04-01 Synchronous belt drives - Automotive pulleys Transmissions synchrones par courroies - Poulies pour la construction automobile This material is reproduced from IS0 documents under Internati
2、onal Organization for Standardization (EO) Copyright License number IHSIICCi1996. Not for resale. No part of these IS0 documents may be reproduced in any form, electronic retrieval system or otherwise, except as allowed in the copyright law of the country of use, or with the prior written consent of
3、 IS0 (Case postale 56,1211 Geneva 20, Switzerland, Fax +41 22 734 I O 79), IHS or the IS0 Licensors members. Reference number IS0 901 1 :I 997(E) STD-IS0 SOLL-ENGL 1777 4851903 0705475 882 IS0 901 1:1997(E) Foreword IS0 (the International Organization for Standardization) is a worldwide federation o
4、f 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 established has the right to be represented on that committee. In
5、ternational organizations, governmental 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 electrotechnical standardization. Draft International Standards adopted by the technical
6、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. International Standard IS0 901 1 was prepared by Technical Committee iSO/TC 41, Pulleys and belts (including veebelts), Subcommi
7、ttee SC 4, Synchronous belt drives. This second edition cancels and replaces the first edition (IS0 901 1 :1987), which has been technically revised. Q IS0 1997 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, ele
8、ctronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. International Organization for Standardization Case postale 56 CH-121 1 Genve 20 Switzerland Internet centralQso.ch X.400 c=ch; a=400net; p=iso; o=isocs; s=central Printed in Switzerland ii
9、 STD.ISO 7013-ENGL 3777 4853703 070547b 719 m INTERNATIONAL STANDARD Q IS0 IS0 901 1:1997(El Synchronous belt drives - Automotive pulleys 1 Scope This International Standard specifies the characteristics of synchronous pulleys for use in automotive applications of synchronous endless belt drives. Th
10、e characteristics include - tooth dimensions and tolerances; - pulley tolerances and quality specifications. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the
11、editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and IS0 maintain registers of curre
12、ntly valid International Standards. IS0 254:-1), Belt drives - Pulleys - Quality, finish and balance. IS0 901 0:1997, Synchronous belt drives - Automotive belts. 3 Pulley types The following types of synchronous pulleys for automotive applications are standardized: - type ZA: trapezoidal tooth; - ty
13、pe ZB: trapezoidal tooth; - type ZH: curvilinear tooth, “H“ system; - type YH: curvilinear tooth, “H“ system; 1) To be published. (Revision of IS0 254:1990) 1 -,-,- STD-ISO 9011-ENGL 1997 4851903 0705477 b55 IS0 901 1:1997(E) - type ZR: curvilinear tooth, “R“ system; - type YR: curvilinear tooth, “R
14、“ system; - type ZS: curvilinear tooth, “S“ system; - type YS: curvilinear tooth, “S“ system. Corresponding belts are standardized in IS0 901 O. 4 Designation IS0 A pulley for a synchronous drive for automobiles is characterized by the number of teeth, the tooth pitch and profile and the width. It i
15、s identified, as is the belt, by a series of numbers and letters as follows: - the first letter “P“ indicates a pulley; - the first set of numbers indicates the number of teeth; - the second letter indicates tooth pitch; - the third letter indicates tooth profile; - the second set of numbers indicat
16、es the corresponding nominal belt width in millimetres as specified in IS0 9010 (see 6.3 for the actual pulley width recommended). EXAMPLE P 40 2 A 19 Pulley3 T T T Number of teeth Tooth pitch A I Tooth profile Width imm) 5 Tooth profile 5.1 Pulleys of types ZA and ZB (involute tooth profile) Dimens
17、ions and tolerances for the generating tool rack for the involute profile of automotive synchronous pulleys of types ZA and ZB are given in table 1 and shown in figure 1. A A - Figure 1 - Generating tool rack for Qpes ZA and ZB 2 -,-,- Q IS0 2,59 STDOIS0 SOLL-ENGL 3997 H 4853703 0705478 591 IS0 9011
18、:1997(E) 1 ,O4 1.42 4,24 1,47 0,686 Table 1 - Generating tool rack dimensions and tolerances for types ZA and ZB Dimensions in millimetres, angle in degrees pulley I z I *0,012 I f0,12 z a 19 9,525 19 S z S 20 z 2 21 9,525 + : : o 5 I + i 0 5 I f 0,03 r I f 0,03 r2 I a I 0,686 2,13 3,1 0.86 0.71 5.2
19、 Pulleys of types ZH and YH Dimensions and tolerances for the generating tool rack for automotive synchronous pulleys of types ZH and YH are given in table 2 and shown in figures 2, 3 and 4. Blend I Pb - LBLend Figure 2 - Generating tool rack for type ZH (17 through 26 teeth) l K I I Figure 3 - Gene
20、rating tool rack for type ZH (27 through 52 teeth) 3 STD-IS0 SOLL-ENGL 1777 4851903 0705479 428 IS0 9011:1997(E) Type N u m b d twth in WIbY z ZH 17Qzd26 27 c z c 52 YH 2 0 3 1 z 2 32 Q IS0 pb B g 4 3 hg r l r2 r3 r4 X Y K f 0,012 I 0.01 5 I 0 . 0 1 2 I 0.01 2 f 0.01 2 f 0.01 2 9.525 3,43 2 . 4 1 0,
21、95 6.67 0,058 1.02 3.7 9.525 3.44 2.5 0.95 0,94 3,61 8 5,28 3 3.02 2,22 0 . 8 2 1 . 5 0,80 3.22 8 5,08 3,11 3,06 2,17 0.67 1 8 1 0,89 3.06 Figure 4 - Generating tool rack for type YH Table 2 - Generating tool rack dimensions and tolerances for types ZH and YH Dimensions in millimetres 5.3 Pulleys of
22、 types ZR and YR Dimensions and tolerances for the generating tool rack for automotive synchronous pulleys of types ZR and YR and given in table 3 and shown in figure 5. I -1 Figure 5 - Generating tool rack for types ZR and YR 4 Q IS0 Type Numbarof teeth in pulley STD=ISO SOLL-ENGL 1997 9 4851903 07
23、05480 L4T IS0 901 1:1997(E) Tooth form parameter Table 3 - Generating tool rack dimensions and tolerances for types ZR and YR ZR YR Z pb B C l A C a h, r a K e f f0.01 + 0,05 f 0.02 O z 20 9,407 5,9 1,865 2,053 0,75 3.45 1 18 0,858 2,726 2,759 20 2 9 7,893 5,6 2,788 1,066 0,75 2,92 0,8 15 1,496 2,64
24、1 2,327 5.4 Pulleys of types ZS and YS Dimensions and tolerances for the pulley groove profile automotive synchronous pulleys of types ZS and YS are given in table 4 and shown in figure 6. Figure 6 - Pulley groove profile for types ZS and YS 5 -,-,- STD-IS0 SOLL-ENGL 1777 4851703 O705LiL Ob IS0 9011
25、:1997(E) I Type IS0 Numberof teeth in pulley z Pb B, Reference“ + 0,1 O Table 4 - Pulley groove dimensions and tolerances for types ZS and YS 2s YS Dimensions in millimetres z) 17 9,525 6,19 6.31 z 3 20 8 5 2 5,3 d0 49 d d , d 99 rs + 0,l O Between any two adjacent teeth Total within a 90“arc) 0,03
26、o, 1 100 d do S 178 179 S d , 305 h, f 0.03 0.03 0,13 0.03 0,15 3.37 2.83 Range 49 d do d 99 rl + 0.1 O Tolerance + 0.1 O 0,48 0.4 r2 + 0,l O 0,89 0,75 1) See table 5 for pulley tooth pitch tolerance. I 6 Pulley dimensions and tolerances 6.1 Pitch tolerances Tolerances on the deviation of pulley pit
27、ch between adjacent teeth and on the total deviation with a 90“ arc or a full tooth past a 90“ arc of a pulley are given in table 5. This tolerance applies to the distance between the same point on either the right or left corresponding flanks of adjacent teeth. Table 5 - Pitch tolerances Dimensions
28、 and tolerances in millimetres I Allowable deviation of pitch I Outside diameter I “ I 1) The allowable deviation of pitch is to include the next full tooth past a 90“ arc. I 6.2 Pulley outside diameter tolerances Tolerances on pulley outside diameters are shown in table 6. Table 6 - Pulley outside
29、diameter tolerances Dimensions and tolerances in millimetres I Outside diameter I 179dd0s305 I + 0.13 O +0.15 O 6 -,-,- IS0 STD-IS0 SOLL-ENGL 1797 4851703 O705482 T I 2 IS0 9010:1997(E) 6.3 Minimum pulley width The minimum widths bf, b;, and figure 7 for a belt with a nominal width of b, are defined
30、 by the following formulae: relative to the toothed part of the flanged and unflanged pulleys indicated in bf = b, + 1,2 mm (double-flanged pulley) b = b, + 5 mm (unflanged pulley) by = bS + 3 mm (single-flanged pulley) Oouble-flanged pulley Unflanged pulley Single-flanged pulley Figure 7 - Minimum
31、pulley width 6.4 Flange dimensions The pulley flange dimensions are shown in figure 8. Dimensions in millimetres Break sharp corners Flange thickness Figure 8 - Flange dimensions 6.5 Other pulley tolerances 6.5.1 Axial runout See table 7. 7 -,-,- STD.ISO 703iL-ENGL 1777 4851703 0705V83 757 W 100 d d
32、o d 254 do 254 IS0 901 1:1997(E) 0,001 per millimetre of outside diameter 0.25 + 0,000 5 per millimetre of outside diameter over 254 Q IS0 49 d do d 202,35 do 203 6.5.2 Radial runout See table 8. 0,13 0,13 + 0,000 5 per millimetre of outside diameter over 203 6.5.3 Parallelism Teeth shall be paralle
33、l to the axis of the bore within 0,001 mm per millimetre of width. 6.5.4 Taper The maximum taper shall be 0,001 mm per millimetre of face width provided that the outside diameter is within the tolerance given in table 6. 7 Quality specification The quality, finish and balance of pulleys shall comply
34、 with the requirements specified in IS0 254. Table 7 - Axial runout Dimensions and tolerances in millimetres I I - Outside diameter l FIM l) I max. Table 8 - Radial runout Dimensions and tolerances in millimetres Outside diameter FIM l) I i d n I max. I 8 -,-,- STD=ISO SOLL-ENGL 1797 985L903 0705984 875 = IS0 901 1:1997(E) Q IS0 ICs 43.060.10 Descriptors: automotive engineering, internal combustion engines, synchronous transmission, belt drives, pulleys, characteristics, dimensions, dimensional tolerances, designation. Price based on 8 pages