1、INTERNATIONAL STANDARD 1340 Cylindrical gears - Information to be given to the manufacturer by the purchaser in order to obtain the gear required Engrenages cylindriques - Indications B fournir au tailleur dengrenages par le client pour obtenir la denture d these documents are now in the process of
2、being trans- formed into International Standards. As part of this process, Technical Committee lSO/TC 60 has reviewed IS0 Recommendation R 1340 and found it technically suitable for transformation. International Standard IS0 1340 therefore replaces IS0 Recommendation R 1340-1971 to which it is techn
3、ically identical. IS0 Recommendation R 1340 was approved by the Member Bodies of the following countries : Australia Austria Belgium Chile Czechoslovakia Egypt, Arab Rep. of Finland France Germany Greece India Israel Italy Japan Korea, Rep. of Netherlands New Zealand Paraguay Poland South Africa, Re
4、p. of Spain Sweden Switzerland Thailand Turkey United Kingdom U.S.S.R. Yugoslavia The Member Bodies of the following countries expressed disapproval of the Recommendation on technical grounds : Hungary* l Subsequently. this Member Body approved the Recommendation. No Member Body disapproved the tran
5、sformation of ISO/R 1340 into an International Standard. $3 International Orgmizrtion for Standardization, 1976 l Printed in Switzerland Copyright International Organization for Standardization Provided by IHS under license with ISONot for ResaleNo reproduction or networking permitted without licens
6、e from IHS-,-,-INTERNATIONAL STANDARD IS0 1340-1976 (E) Cylindrical gears - Information to be given to the manufacturer by the purchaser in order to obtain the gear required 1 SCOPE AND FIELD OF APPLICATION This International Standard specifies the information which should be stated on all cylindric
7、al gear drawings. For each particular case they should be completed by such infor- mation as may be necessary or useful. 2 REFERENCES IS0 53, Cylindricalgears forgeneral and heavy engineering - Basic rack. I SO/R 468, Surface roughness. IS0 1302, Technical drawings - Method of indicating surface tex
8、ture on drawings. IS0 1328, Parallel involute gears - IS0 system of accuracy. IS0 2203, Technical drawings - Conventional represen- tation of gears. 3 GENERAL DIMENSIONS AND CHARACTERISTICS TO BE INDICATED ON THE DRAWING - Tip diameter and tolerance - Facewidth - Bore diameter and tolerance (or diam
9、eter and tolerance for the part of the shaft used for setting on the cutting machine) - Locating face - Surface finish of the tooth flank and, if applicable, of the root surface and of the filletslj 4 INFORMATION TO BE GIVEN IN A TABLE The following information should preferably be given in the uppe
10、r right-hand corner of the drawing : - Module or diametral pitch (normal, in the case of helical gears) - Number of teeth (for a sector : total number of teeth of the gear from which the sector is taken) - Basic rack (give the number of the corresponding national standard or the pressure angle of 20
11、; if the basic rack differs from the standard rack, its character- istics should be specified, preferably by a figure) - Value of the helix angle - Helix direction (for double helix teeth, the helix direction should be shown by a symbol in accordance with IS0 2203) - Reference diameter - Addendum mo
12、dification coefficient (to be expressed in unit module) - Tooth thickness : basic value and upper and lower deviations (the basic value may be given in three differ- ent ways : Wildhaber measurement, measurement of constant chord, or measurement over pins or balls. For the first method, the number o
13、f teeth over which the measurement is to be carried out should be stated, and, for the third method, the diameter of the pins or balls) - All useful information on tolerances (see IS0 1328) - Centre distance of gear pair and tolerance - Number of teeth and drawing number of the mating gear. NOTE - T
14、he features outllned In clauses 3 and 4 are those which are considered essential. Any other useful Information should be given to the gear manufacturer for the manufacture and Inspectton of the teeth as required by the particular form and characterlstlcs of the gear. In particular : a) the necessity
15、 of ensuring firm locatlon of the body of the gear on the cutting machlne will require that the support and clamplng faces (which should be perpendicular to the axIs. and their permissible axial run-out should be Indicated. bl for shafted plnlons and wheels the bores of which wall not be used as ref
16、erence for centring, it IS necessary to specify rhe maxlmum radtal run-out of the surface which serves as datum for checking the centnng before commencemenf of cutttng: cl checking the accuracy of the teeth may necessctate the lndtcatlon of certain characterlstlcs (for example, the dlamerer of the b
17、ase cyhnder) or of special dlmenslon and form tolerances for certain elements which serve as datum for measurement (for example, the tip cylinder). 1) Specifications concerning surface texture and the symbols used should be in accordance with ISO/R 468 and IS0 1302. Copyright International Organizat
18、ion for Standardization Provided by IHS under license with ISONot for ResaleNo reproduction or networking permitted without license from IHS-,-,-IS0 1340-1976 (E) 5 EXAMPLE Dimensions in millimetres M: Locating face Chwactwistii of the to& Module 5 Number of teeth 44 Basic rack IS0 53 - 20“ Helix an
19、gle 23.5565“ or 23“3323.4“ I Direction of helix angle Reference diameter right hand 240 mm Addendum modification coefficient 0 I Tooth thickness : base tangent length over k teeth (k = 61 Quality class) 6 I Centre distance 240 f 0.02 mm I Mating gear 2=44 drawing No. 12345 I 2) I 2) 2) 1) According to IS0 1328, or to a corresponding national standard. 2) Complementary information which may be necessary or useful. 2 Copyright International Organization for Standardization Provided by IHS under license with ISONot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
