1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA
2、NET SYSTEM only. Unless specific permission has been granted, this document MAY NOT be sent or given to staff members from other companies or organizations. Doing so would constitute a VIOLATION of SABS copyright rules. 2. Indemnity The South African Bureau of Standards accepts no liability for any
3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. ISBN 987-0-626-19662-2 SANS 10823:2007Edition 1ISO 10823:2004Edition 2SOUTH AFRICAN NATIONAL STANDARD Guidelines for the selection of roller chain drives
4、 This national standard is the identical implementation of ISO 10823:2004 and is adopted with the permission of the International Organization for Standardization. Published by Standards South Africa 1 dr lategan road groenkloof private bag x191 pretoria 0001 tel: 012 428 7911 fax: 012 344 1568 inte
5、rnational code + 27 12 www.stansa.co.za Standards South Africa SANS 10823:2007 Edition 1 ISO 10823:2004 Edition 2 Table of changes Change No. Date Scope National foreword This South African standard was approved by National Committee StanSA SC 5120.09C, Mining equipment Chains and chain wheels for p
6、ower transmission and conveyors, in accordance with procedures of Standards South Africa, in compliance with annex 3 of the WTO/TBT agreement. This standard was published in April 2007. Reference numberISO 10823:2004(E)ISO 2004INTERNATIONAL STANDARD ISO10823Second edition2004-02-01Guidelines for the
7、 selection of roller chain drives Mthode de slection des transmissions par chane rouleaux SANS 10823:2007This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 10823:2004(E) PDF disclaimer This PDF file may contain embedded typefaces. In accorda
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10、g. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. ISO 2004 All rights reserved. Unless otherwise specified, no part of this pub
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12、eva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2004 All rights reservedSANS 10823:2007This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 10823:2004(E) ISO 2004 All
13、rights reserved iiiContents Page Foreword iv 1 Scope 1 2 Normative references . 1 3 Symbols . 1 4 Basic equations. 1 4.1 Input power 1 4.2 Corrected power 1 5 Drive design specifications . 2 6 Sprocket selection 3 7 Chain calculations and selection 3 7.1 Normal operating conditions and drive capacit
14、ies for chains . 3 7.2 Correction for other operating conditions for chains. 7 7.3 Chain selection 9 7.4 Chain length 9 7.5 Chain speed. 9 8 Maximum sprocket centre distance 10 9 Lubrication. 11 9.1 Methods of lubrication 11 9.2 Oil viscosity . 12 10 Good practice in drive design . 12 10.1 Sprocket
15、centre distance . 12 10.2 Chain adjustment 14 10.3 Idlers. 14 10.4 Drive layout 15 Annex A (informative) Example of chain drive selection . 16 Annex B (informative) Power rating equations 19 SANS 10823:2007This s tandard may only be used and printed by approved subscription and freemailing clients o
16、f the SABS .ISO 10823:2004(E) iv ISO 2004 All rights reservedForeword 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 carried out through ISO technical commi
17、ttees. 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 work. ISO collaborates closely with the I
18、nternational 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 International Standards. Draft Internationa
19、l 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 the elements of this document may be the
20、 subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 10823 was prepared by Technical Committee ISO/TC 100, Chains and chain wheels for power transmission and conveyors. This second edition cancels and replaces the first edition (ISO 10823:19
21、96), which has been technically revised. SANS 10823:2007This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .INTERNATIONAL STANDARD ISO 10823:2004(E) ISO 2004 All rights reserved 1Guidelines for the selection of roller chain drives 1 Scope This In
22、ternational Standard gives guidelines for the selection of chain drives, composed of a roller chain and sprockets conformant with ISO 606, for industrial applications. The selection procedures and the chain ratings it describes provide for roller chain drives operating under specified conditions, as
23、 defined in 9.1, 9.2 and in Clause 10, with a life expectancy of approximately 15 000 h. Owing to the wide variations in loading characteristics, environmental conditions and achieved maintenance, it is desirable that the supplier of the chains and sprockets be consulted to ensure that the performan
24、ce of the product meets the requirements specified both by the user and by this International Standard. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the
25、latest edition of the referenced document (including any amendments) applies. ISO 606, Short-pitch transmission precision roller chains and chain wheels 3 Symbols The symbols and units used in this International Standard are given in Table 1. 4 Basic equations 4.1 Input power The power to be transmi
26、tted is the input P, in kilowatts, to the drive sprocket. If input torque is the known requirement, then P can be derived from the following equation: 19 550M nP= (1) 4.2 Corrected power To allow for the characteristics of the drive system and the type of load to be transmitted, the input power, P,
27、is multiplied by factors to obtain the corrected power, Pc. c12PPff= (2) SANS 10823:2007This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 10823:2004(E) 2 ISO 2004 All rights reservedTable 1 Symbols, designations and units Symbol Designation
28、 Unit a Maximum centre distance mm a0Approximate centre distance mm f1Application factor to allow for the operating conditions (see Table 2) f2Factor for number of teeth on small sprocket see Figure 4 and Equation (5) f3Factor for calculation of the number of links with different number of teeth (se
29、e Table 5) f4Factor for the calculation of the centre distance with different numbers of teeth (see Table 6) i Speed ratio M Input torque Nm n1Input sprocket speed min1n2Output sprocket speed min1nsSmall sprocket speed min1p Chain pitch mm P Input power kW PcCorrected power kW v Chain speed ms1X Num
30、ber of pitches in chain X0Calculated number of pitches in chain z1Number of input sprocket teeth z2Number of output sprocket teeth zsNumber of small sprocket teeth 5 Drive design specifications The following design features should be specified before the chain and sprockets are selected: a) power to
31、 be transmitted; b) type of driver and driven machinery; c) speeds and sizes of the driver and driven shafts; d) centre distance and layout of the shafts; e) environmental conditions. NOTE Shaft sizes, unusually long or short centre distances, and/or a complex layout could influence the drive select
32、ion. SANS 10823:2007This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 10823:2004(E) ISO 2004 All rights reserved 36 Sprocket selection Determine the number of teeth on the sprockets using the following procedure: a) select the desired numbe
33、r of teeth for the input sprocket; b) determine the speed ratio, i, using the equation: 12nin= (3) c) determine the number of teeth on the output sprocket, z2, using the equation: 21z iz= (4) It is good practice to use sprockets with not less than 17 teeth and not more than 114 teeth. If the chain d
34、rive operates at high speed or if it is subjected to impulse loads, the small sprocket should have at least 25 teeth and the teeth should be hardened. 7 Chain calculations and selection 7.1 Normal operating conditions and drive capacities for chains The typical capacity rating charts shown in Figure
35、s 1, 2 and 3 apply to chain drives operating under the following conditions: a) a chain drive with two sprockets on parallel horizontal shafts; b) a small sprocket with 19 teeth; c) a simplex chain without cranked link; d) a chain length of 120 pitches (different chain lengths will affect chain life
36、); e) a speed ratio of from 1:3 to 3:1; f) an expected life of 15 000 h; g) an operating temperature between 5 C and +70 C; h) sprockets correctly aligned and chain maintained in correct adjustment (see Clause 10); i) uniform operation without overload, shocks or frequent starts; j) clean and adequa
37、te lubrication throughout the chains life (see Clause 9). Figures 1, 2 and 3 can be used to select the size of chain suitable for a chain drive as a function of the corrected power, Pc, and the small sprocket rotational speed, ns. The capacity rating charts given in Figures 1, 2 and 3 are representa
38、tive of those published by chain manufacturers. Individual manufacturers can rate their chains differently. It is therefore recommended that the appropriate manufacturers rating chart be consulted. SANS 10823:2007This s tandard may only be used and printed by approved subscription and freemailing cl
39、ients of the SABS .ISO 10823:2004(E) 4 ISO 2004 All rights reservedKey Pccorrected power nssmall sprocket speed NOTE 1 The power rating of duplex chain can be calculated by multiplying the value of Pcfor simplex chain by 1,7. NOTE 2 The power rating of triplex chain can be calculated by multiplying
40、the value of Pcfor simplex chain by 2,5. Figure 1 Typical capacity chart for selection of Type A simplex chains based on a 19-tooth sprocket conforming with ISO 606 SANS 10823:2007This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 10823:2004
41、(E) ISO 2004 All rights reserved 5Key Pccorrected power nssmall sprocket speed NOTE 1 The power rating of duplex chain can be calculated by multiplying the value of Pcfor simplex chain by 1,7. NOTE 2 The power rating of triplex chain can be calculated by multiplying the value of Pcfor simplex chain
42、by 2,5. Figure 2 Typical capacity chart for selection of Type A heavy-series simplex chains based on a 19-tooth sprocket conforming with ISO 606 SANS 10823:2007This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 10823:2004(E) 6 ISO 2004 All r
43、ights reservedKey Pccorrected power nssmall sprocket speed NOTE 1 The power rating of duplex chain can be calculated by multiplying the value of Pcfor simplex chain by 1,7. NOTE 2 The power rating of triplex chain can be calculated by multiplying the value of Pcfor simplex chain by 2,5. Figure 3 Typ
44、ical capacity chart for selection of Type B simplex chains based on a 19-tooth sprocket conforming with ISO 606 SANS 10823:2007This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 10823:2004(E) ISO 2004 All rights reserved 77.2 Correction for
45、other operating conditions for chains 7.2.1 Power correction If the characteristics of the chain drive and its operating conditions are different from those described in 7.1, the transmitted power shall be corrected by using Equation (2). The derivation of factors f1and f2are given in 7.2.2 and 7.2.
46、3. 7.2.2 Application factor f1Factor f1takes into account dynamic overloads dependant on the chain drive operating conditions and resulting, in particular, from the nature of the driver and driven elements. The value of factor f1can be selected directly or by analogy using Table 2 in conjunction wit
47、h the definitions given in Tables 3 and 4. Table 2 Application factor f1Driver machine characteristics (see Table 3) Driven machine characteristics (see Table 4) Smooth running Slight shocks Moderate shocks Smooth running 1,0 1,1 1,3 Moderate shocks 1,4 1,5 1,7 Heavy shocks 1,8 1,9 2,1 Table 3 Defin
48、itions of characteristics of driver machines Driver machine characteristics Machine type examples Smooth running Electric motors, steam and gas turbines and Internal combustion engines with hydraulic coupling Slight shocks Internal combustion engines with six cylinders or more with mechanical coupli
49、ng, electric motors subjected to frequent starts (more than two per day) Moderate shocks Internal combustion engines with less than six cylinders with mechanical coupling Table 4 Definitions of characteristics of driven machines Characteristics of driven machine Machine type examples Smooth running Centrifugal pumps and compressors, printing machines, uniformly loaded belt conveyors, paper calendars, escalators, liquid agitators and mixers, rotary dryers, fans Moderate shocks Reciproc
