BS ISO 5295-2017 Synchronous belts Calculation of power rating and drive centre distance《同步带 功率定额和驱动中心距离的计算》.pdf

《BS ISO 5295-2017 Synchronous belts Calculation of power rating and drive centre distance《同步带 功率定额和驱动中心距离的计算》.pdf》由会员分享，可在线阅读，更多相关《BS ISO 5295-2017 Synchronous belts Calculation of power rating and drive centre distance《同步带 功率定额和驱动中心距离的计算》.pdf（14页珍藏版）》请在麦多课文档分享上搜索。

1、Synchronous belts Calculation of power rating and drive centre distanceBS ISO 5295:2017BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06 ISO 2017Synchronous belts Calculation of power rating and drive centre distanceCourroies synchrones Calcul de la puissance transmis

2、sible et de lentraxeINTERNATIONAL STANDARDISO5295Third edition2017-04Reference numberISO 5295:2017(E)National forewordThis British Standard is the UK implementation of ISO 5295:2017.The UK participation in its preparation was entrusted to Technical Committee MCE/10, Belts the belt width; the mass of

3、 a linear metre of belt; the allowable working tension in the belt; the angular velocity of the smaller pulley; the number of teeth of the smaller pulley; the number of teeth in mesh on the smaller pulley. ISO 2017 All rights reserved 1BS ISO 5295:2017ISO 5295:2017(E)4 SymbolsSymbol Description Unit

4、sPbpitch of the teeth of the belt and pulleys mmbswidth of the belt to be rated mmbsobase width of the widest standard belt of pitch Pb(see Table 2) mmm linear mass of a belt having a width bsokg/mTaallowable working tension of a belt having a width bsoNw angular velocity of the smaller pulley rad/s

5、v belt velocity m/sz1number of teeth of the smaller pulleyz2number of teeth of the larger pulleyzbnumber of teeth of the beltZmnumber of teeth in mesh on the smaller pulleyc centre distance of the pulleys mmPopower rating of a belt of base width bsokWP power rating of a belt of base width bskWkwwidt

6、h factorkzteeth in mesh factorent integer part only of the expression following5 Basic power ratingThe basic power rating of a belt of base width, bso, is given by the Formula (1):PTmvvoa=( )21000(1)where the belt velocity, v, has the value given by Formula (2):vPz=b13102pi(2)Formula (1) is valid on

7、ly if the number of teeth in mesh zm 6 (see Clause 6 for zm 6).The values of Taand m depend upon the construction and the type of belt; these shall be supplied by the belt manufacturer.6 Power rating6.1 Exact formulaThe power rating of a belt of width, bs, having zmteeth in mesh on the smaller pulle

8、y, is given by Formula (3):PkkTbmvbv=zwasso2310 (3)See Clauses 9 and 10 for kzand kw, respectively.2 ISO 2017 All rights reservedBS ISO 5295:2017ISO 5295:2017(E)4 SymbolsSymbol Description UnitsPbpitch of the teeth of the belt and pulleys mmbswidth of the belt to be rated mmbsobase width of the wide

9、st standard belt of pitch Pb(see Table 2) mmm linear mass of a belt having a width bsokg/mTaallowable working tension of a belt having a width bsoNw angular velocity of the smaller pulley rad/sv belt velocity m/sz1number of teeth of the smaller pulleyz2number of teeth of the larger pulleyzbnumber of

10、 teeth of the beltZmnumber of teeth in mesh on the smaller pulleyc centre distance of the pulleys mmPopower rating of a belt of base width bsokWP power rating of a belt of base width bskWkwwidth factorkzteeth in mesh factorent integer part only of the expression following5 Basic power ratingThe basi

11、c power rating of a belt of base width, bso, is given by the Formula (1):PTmvvoa=( )21000(1)where the belt velocity, v, has the value given by Formula (2):vPz=b13102pi(2)Formula (1) is valid only if the number of teeth in mesh zm 6 (see Clause 6 for zm 6).The values of Taand m depend upon the constr

12、uction and the type of belt; these shall be supplied by the belt manufacturer.6 Power rating6.1 Exact formulaThe power rating of a belt of width, bs, having zmteeth in mesh on the smaller pulley, is given by Formula (3):PkkTbmvbv=zwasso2310 (3)See Clauses 9 and 10 for kzand kw, respectively.2 ISO 20

13、17 All rights reserved ISO 5295:2017(E)6.2 Approximate formulaThe power rating may be calculated approximately by simplification of Formula (3) as given by Formula (4):P kzkwPo(4)7 Centre distance7.1 Exact formulaFirst, calculate the auxiliary angle, , using Formula (5): =pizzzzb221(5)where inv = ta

14、n ; the value of (see Figure 1) can be determined by iteration or from involute tables.The centre distance, C, is then given by Formula (6):CPz z=()bcos212pi (6)The method according to Formula (5) and (6) is valid in any case. However, it should not be used if the ratio z2/z1is close to unity, becau

15、se the expression for C becomes the ratio of two small quantities. In this case, the method according to 7.2 is recommended.Key1 C 3 Z1teeth2 4 Z2teeth5 ZbteethFigure 1 Centre distance ISO 2017 All rights reserved 3BS ISO 5295:2017ISO 5295:2017(E)7.2 Approximate formulaFirstly, calculate M by Formul

16、a (7)MPzzz=()bb8212(7)then the centre distance, C, by Formula (8):CM MPz z=+ ()221218bpi(8)This method is to be avoided when the ratio z2/z1is large. In this case, the method according to 7.1 shall be used.8 Number of teeth in meshThis number is given by Formula (9):zz PzCzzmbent= ()1 122122pi(9)in

17、which 122pimay be replaced by 120for ease of calculation.9 Factor kzThe factor kzis given by Formulae (10) and (11):If zm 6, kz= 1 (10)If zm 6, kz= 1 0,2(6 zm) (11)10 Factor kwThe factor kwis given by Formula (12):kbbwsso=114,(12)where bsodepends upon the pitch code as given in Table 1.The resulting

18、 calculation of kwis rounded off to two decimal places according to the usual convention.4 ISO 2017 All rights reservedBS ISO 5295:2017ISO 5295:2017(E)7.2 Approximate formulaFirstly, calculate M by Formula (7)MPzzz=()bb8212(7)then the centre distance, C, by Formula (8):CM MPz z=+ ()221218bpi(8)This

19、method is to be avoided when the ratio z2/z1is large. In this case, the method according to 7.1 shall be used.8 Number of teeth in meshThis number is given by Formula (9):zz PzCzzmbent= ()1 122122pi(9)in which 122pimay be replaced by 120for ease of calculation.9 Factor kzThe factor kzis given by For

20、mulae (10) and (11):If zm 6, kz= 1 (10)If zm 6, kz= 1 0,2(6 zm) (11)10 Factor kwThe factor kwis given by Formula (12):kbbwsso=114,(12)where bsodepends upon the pitch code as given in Table 1.The resulting calculation of kwis rounded off to two decimal places according to the usual convention.4 ISO 2

21、017 All rights reserved ISO 5295:2017(E)Table 1 Base widthsDimensions in millimetresPitch code bsoMXL6,4XXLXL 9,5L 25,4H 76,2XH 101,6XXH 127 ISO 2017 All rights reserved 5BS ISO 5295:2017This page deliberately left blankThis page deliberately left blankBSI is the national body responsible for prepar

22、ing British Standards and other standards-related publications, information and services.BSI is incorporated by Royal Charter. British Standards and other standardization products are published by BSI Standards Limited.British Standards Institution (BSI)About usWe bring together business, industry,

23、government, consumers, innovators and others to shape their combined experience and expertise into standards -based solutions.The knowledge embodied in our standards has been carefully assembled in a dependable format and refined through our open consultation process. Organizations of all sizes and

24、across all sectors choose standards to help them achieve their goals.Information on standardsWe can provide you with the knowledge that your organization needs to succeed. Find out more about British Standards by visiting our website at or contacting our Customer Services team or Knowledge Centre.B

25、uying standardsYou can buy and download PDF versions of BSI publications, including British and adopted European and international standards, through our website at where hard copies can also be purchased. If you need international and foreign standards from other Standards Development Organization

26、s, hard copies can be ordered from our Customer Services team.Copyright in BSI publicationsAll the content in BSI publications, including British Standards, is the property of and copyrighted by BSI or some person or entity that owns copyright in the information used (such as the international stand

27、ardization bodies) and has formally licensed such information to BSI for commercial publication and use.Save for the provisions below, you may not transfer, share or disseminate any portion of the standard to any other person. You may not adapt, distribute, commercially exploit, or publicly display

28、the standard or any portion thereof in any manner whatsoever without BSIs prior written consent.Storing and using standardsStandards purchased in soft copy format: A British Standard purchased in soft copy format is licensed to a sole named user for personal or internal company use only. The standar

29、d may be stored on more than 1 device provided that it is accessible by the sole named user only and that only 1 copy is accessed at any one time. A single paper copy may be printed for personal or internal company use only.Standards purchased in hard copy format: A British Standard purchased in har

30、d copy format is for personal or internal company use only. It may not be further reproduced in any format to create an additional copy. This includes scanning of the document.If you need more than 1 copy of the document, or if you wish to share the document on an internal network, you can save mone

31、y by choosing a subscription product (see Subscriptions).Reproducing extractsFor permission to reproduce content from BSI publications contact the BSI Copyright & Licensing team.SubscriptionsOur range of subscription services are designed to make using standards easier for you. For further informati

32、on on our subscription products go to British Standards Online (BSOL) youll have instant access to over 55,000 British and adopted European and international standards from your desktop. Its available 24/7 and is refreshed daily so youll always be up to date. You can keep in touch with standards de

33、velopments and receive substantial discounts on the purchase price of standards, both in single copy and subscription format, by becoming a BSI Subscribing Member. PLUS is an updating service exclusive to BSI Subscribing Members. You will automatically receive the latest hard copy of your standards

34、when theyre revised or replaced. To find out more about becoming a BSI Subscribing Member and the benefits of membership, please visit a Multi-User Network Licence (MUNL) you are able to host standards publications on your intranet. Licences can cover as few or as many users as you wish. With updat

35、es supplied as soon as theyre available, you can be sure your documentation is current. For further information, email .RevisionsOur British Standards and other publications are updated by amendment or revision. We continually improve the quality of our products and services to benefit your business

36、. If you find an inaccuracy or ambiguity within a British Standard or other BSI publication please inform the Knowledge Centre.Useful ContactsCustomer ServicesTel: +44 345 086 9001Email (orders): Email (enquiries): SubscriptionsTel: +44 345 086 9001Email: Knowledge CentreTel: +44 20 8996 7004Email: Copyright & LicensingTel: +44 20 8996 7070Email: NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Group Headquarters389 Chiswick High Road London W4 4AL UKBSI Back Cover.indd 1 27/01/2016 14:20