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1、BRITISH STANDARD BS 6889:1987 Specification for Generating racks for synchronous belt drive pulleys UDC 621.852.86.05 Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 05:25:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6889:1987 This British Standard, having been prepared under the directio
2、n of the Machinery and Components Standards Committee, was published under the authority of the Board of BSI and comes into effect on 30 November 1987 BSI 10-1999 The following BSI references relate to the work on this standard: Committee reference MCE/10 Draft for comment 86/74323 DC ISBN 0 580 161
3、78 1 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Machinery and Components Standards Committee (MCE/-) to Technical Committee MCE/10, upon which the following bodies were represented: Agricultural Engineers Association British Coal Br
4、itish Gear Association British Rubber Manufacturers Association Society of Motor Manufacturers and Traders Limited Amendments issued since publication Amd. No.Date of issueComments Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 05:25:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6889:1987
5、 BSI 10-1999i Contents Page Committees responsibleInside front cover Forewordii 1Scope1 2Definitions1 3Dimensions and tolerances1 Figure 1 The profile of the generating rack1 Table 1 Dimensions and tolerances for racks for generating grooves in pulleys2 Publications referred toInside back cover Lice
6、nsed Copy: sheffieldun sheffieldun, na, Tue Dec 05 05:25:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6889:1987 ii BSI 10-1999 Foreword This British Standard has been prepared under the direction of the Machinery and Components Standards Committee. It specifies the dimensions and tolerances for
7、racks used to generate the groove profile on pulleys as used in various industrial synchronous belt drive systems included in BS 4548:1987. It also includes racks for pulleys for automotive belt drives (pitch code ZA) as specified in BS AU 218. Because this particular aspect of manufacture of synchr
8、onous belt drives is primarily confined to one sector of the industry, it is more convenient to include the requirements for all racks in one standard. The requirements for racks for industrial pulleys were previously described in BS 4548:1970 but are excluded from the 1987 revision of that standard
9、. This standard for racks is aligned with the dimensional details of BS 4548:1987 and BS AU 218, all of which are as agreed in discussions in the International Organization for Standardization (ISO). A British Standard does not purport to include all the necessary provisions of a contract. Users of
10、British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 and 2, an inside back cover and a back
11、 cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 05:25:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6889:1987 BSI 1
12、0-19991 1 Scope This British Standard specifies the dimensions and tolerances for racks that are used for generating grooves in pulleys for synchronous belt drives. NOTEThe titles of the publications referred to in this standard are listed on the inside back cover. 2 Definitions For the purposes of
13、this British Standard, the following definitions apply. 2.1 generating rack profile the shape of the generating rack (see Figure 1) 2.2 pitch code a code designating different sections of belts and associated pulleys (see Table 1) 3 Dimensions and tolerances The dimensions and tolerances for racks f
14、or generating grooves in types of pulleys as defined by the appropriate pitch code shall be as given in Table 1. NOTEThis figure shows the symbols assigned to the various dimensional parameters specified. Figure 1 Profile of the generating rack Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05
15、05:25:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6889:1987 2 BSI 10-1999 Table 1 Dimensions and tolerances for racks for generating grooves in pulleys Pitch code Number of grooves in pulley PbAhrbgr1r22a 0.003 0.0001 0.12+ 0.05 0 + 0.002 0 + 0.05 0 + 0.002 0 0.03 0.001 0.03 0.001 XL10 and over
16、 mm 5.080 in 0.2000 degrees 25 mm 1.40 in 0.055 mm 1.27 in 0.050 mm 0.61 in 0.024 mm 0.61 in 0.024 mm 0.508 in 0.020 L10 and over9.5250.3750202.130.0843.100.1220.860.0340.530.0210.7620.030 H 14 to 19 12.7000.5000202.590.1024.240.1671.470.058 1.040.041 1.3720.054 20 and over1.420.056 XH18 and over22.
17、2250.8750206.880.2717.590.2992.010.0791.930.0762.7940.110 XXH18 and over31.7501.25002010.290.40511.610.4572.690.1062.820.1113.0480.120 MXL 10 to 23 2.0320.0800 28 0.640.025 0.610.024 0.300.0120.230.0090.5080.020 24 and over200.670.0265 ZA19 and over9.525202.133.100.860.711.372 Licensed Copy: sheffie
18、ldun sheffieldun, na, Tue Dec 05 05:25:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6889:1987 BSI 10-1999 Publications referred to BS 4548, Specification for synchronous belt drives for industrial applications1). BS AU 218, Specification for automotive synchronous belt drives1). 1) Referred to i
19、n the foreword only. Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 05:25:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6889:1987 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It
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28、implementation then the prior written permission of BSI must be obtained. If permission is granted, the terms may include royalty payments or a licensing agreement. Details and advice can be obtained from the Copyright Manager. Tel: 020 8996 7070. Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 05:25:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI