1、Denominations on Gears and Gear Pairs Bevel and Hypoid Gears and Gear Pairs Benennungen an Zahnrdern und Zahnradpaaren; Kegelrder und Kegelradpaare, Hypoidrder und Hypoidradpaare DIN 3998 Part 3 This Standard contains the denominations of the international dictionary of definitions for gear tooth ge
2、ometry, Part 1 being concerned with general denominations, Part 2 with cylindrical gears and cylindrical gear pairs, Part 3 with bevel gears and bevel gear pairs as well as with hypoid gears and hypoid gear pairs, and Part 4 with worm gear pairs. Supplementary Sheet 1 to DIN 3998 lists the keywords
3、of the denominations in English and French in alphabetical order. For connection with Recommendation ISO/R 1122 - 1969 issued by the International Organization for Standardization (ISO), see Explanations. The sequence of the denominations and the consecutive numbering in DIN 3998 Pari 1 to Part 4 ag
4、ree with ISO/R 1122. The denominations are stated in English and French. Contents 3 Bevel and hypoid gears and gear pairs . 2 Ser. No. Page 3.1 Bevelgears . 2 3.1.1 Cones . 2 3.1.2 3.1.3 3.1.4 3.1.5 3.1.6 3.1.7 3.1.8 3.1.9 Dimensions of cones . 4 Longitudinal dimensions. 5 Addendum and dedendum . 6
5、Transverse dimensions (straight bevel gears) 7 Chords (straight bevel gears) 9 Types of bevel and hypoid gears. . 9 Teeth generation (straight bevel gear) 10 Generating cutting tools . 10 3.2 Bevel and hypoid gear pairs 11 3.2.1 Types of gear pairs 11 3.2.2 Depths and clearances (gear pairs with int
6、ersecting axes) 11 3.2.3 Addendum and shaft angle modification 12 Continued on pages 2 to 14 Explanations on page 14 Alleinverkauf der Normen durch Beuth Verlag GrnbH. Berlin 30 und Koln 1 07.79 DIN 3998 Part 3 engl. Prekgr. 9 Vertr.-Nr. O109 Page 2 DIN 3998 Part 3 Denomination Bevel and hypoid gear
7、s and gear pairs Roues et engrenages coniques et hypoides Bevel gears Roues coniques Cones Cnes Reference cone Cbne primitif de rfrence Reference cone apex Sommet Pitch cone Cne primitif de fonctionnement Tip cone Cne de tte Root cone Cne de pied Examples of design 1 ) Number according to ISO/R 11 2
8、2 DIN 3998 Part 3 Page 3 Denomination Back cone Cne complmentaire Inner cone Cne complmentaire in terne Middle cone Cne complmentaire moyen Inner. . . . . . interne Middle. . . . . . moyen Back cone tooth profile Profil (par abrviation de ,profil apparent”) Virtual cylindrical gear of a bevel gear R
9、oue cylindrique quivalente Examples of desigi 1 ) See page 2 Page 4 DIN 3998 Part 3 Ser. No. 1) 3.1.2 3.1.2.1 3.1.2.2 3.1.2.3 3.1.2.4 3.1.2.5 Denomination Dimensions of cones Dimensions de cnes Reference cone angle Angle primitif de rfrence Pitch angle Angle primitif de fonctionnement Reference circ
10、le Cercle primitif de rfrence Reference diameter Diamtre primitif de rfrence Tip angle Angle de tte Root angle Angle de pied Examples of design 1) See page 2 DIN 3998 Part 3 Page 5 I Ser. No. 1) 3.1.3 3.1.2.6 Longitudinal dimensions Dimensions longitudinales 3.1.2.7 Denom inat ion Tip circle Cercle
11、de tte Root circle Cercle de pied Tip diameter Diamtre de tte Root diameter Diamtre de pied Examples of design 3.1.3.1 Facewidth Largeur de denture 3.1.3.2 Cone distance Gnratrice ) See page 2 Page 6 DIN 3998 Part 3 Ser. No. 1) 3.1.3.3 3.1.3.4 3.1.3.5 Denomination Locating face Face de dpart Locatin
12、g distance Distance de dpart Tip distance Distance de tte Examples of design 3.1.4 Addendum and dedendum Saillie et creux 3.1.4.1 I Tooth depth Hauteur de dent 3.1.4.2 Addendum Saillie 1 ) See page 2 D IN 3998 Part 3 Page 7 Ser. No. 1) 3.1.4.3 3.1.4.4 3.1.4.5 3.1.5 3.1.5.1 3.1 5.2 Denomination Adden
13、dum angle Angle de saillie Dedendum Creux Dedendum angle Angle de creux Transverse dimensions (straight bevel gears) Dimensions (roues coniques droites) Pressure angle at a point Angle dincidence Pressure angle Angle de pression Examples of design 11 See page 2 Page 8 DIN 3998 Part 3 Denomination Pi
14、tch Pas Module Module Diametral pitch Diametral pitch Tooth thickness Epaisseur Spacewidth In tervalle Tooth thickness half angle Demi-angle dpaisseur Spacewidth half angle Demi-angle dintervalle Examples of design t-l II- 1) See page 2 Ser. No. 1) 3.1.6 3.1.6.1 3.1.6.2 3.1.7 3.1.7.1 3.1.7.2 3.1.7.3
15、 3.1.7.4 3.1.7.5 DI N 3998 Part 3 Page 9 Denomination Examples of design roues coniques Chordal tooth thickness Corde Saillie la corde Types of bevel and hypoid gears Types de roues coniques et hypodes Crown gear Roue plate Contrate gear Roue de champ Skew bevel gear Roue conique hlicodale Offset of
16、 tooth trace Excentrement des lignes de flancs Octoid gear (so-called ,involute bevel gear) Roue octode (dite ,roue conique dveloppante“) 1 ) See page 2 Page 10 DIN 3998 Part 3 I Ser. No.) I 3.1.8 3.1.8.1 3.1.8.2 3.1.8.3 3.1.8.4 3.1.8.5 3.1.9 3.1.9.1 3.1.9.2 3.1.9.3 Denom inat ion Examples of design
17、 Teeth generation (straight bevel gear) Gnration de la denture (engrenage conique droit) Standard basic rack tooth profile of bevel gears Trac de rfrence de mues coniques Addendum modification of a bevelgear 2) port dune roue conique Addendum modification coefficient 2, Coefficient de general defini
18、tions DIN 3998 Part 2 Denominations on gears and gear pairs; cylindrical gears and gear pairs DIN 3998 Part 4 Denominations on gears and gear pairs; worm gear pairs DIN 3998 Supplementary Sheet 1 Denominations on gears and gear pairs; alphabetical index of equivalent terms DIN 3999 Symbols for gear
19、teeth Explanations This Standard lays down the English technical terminology relating to gear teeth in order to facilitate understanding and oderly arrangement of terms. The sequence of technical terms and their consecutive numbering in Part 1 to Part 4 as well as the additional French denominations
20、 agree with the Recommendation issued by the International Organization for Standard- ization (ISO) ISO/R 1 122 - 1969 *) Glossary of gears; geometrical definitions Vocabulaire des engrenages; dfinitions gomtriques In this Standard certain technical denominations additional to those stated in ISO/R
21、1122 - 1969 have been included where this appeared necessary for the sake of complete coverage. Moreover, in some cases existing expressions have been added in brackets. In all cases the non-bracketed terms are the ruling ones. DIN 3998 is subdivided into Part 1 for general definitions, Part 2 for c
22、ylindrical gears and cylindrical gear pairs, Part 3 for bevel gears and bevel gear pairs as well as hypoid gears and hypoid gear pairs, and Part 4 for worm gear pairs. In addition, in Supplementary Sheet 1 to DIN 3998 the keywords of the denominations in English and French are listed in alphabetical
23、 order and with the serial number under which the denominations appear in Part 1 to Part 4. Recommendation ISO/R 1122 - 1969 contains - like,for example, the Swiss Standard VSM 15 522 also - not only the denominations but also the definitions for geometrical specifi- cation factors for gears and gea
24、r pairs. The definitions have not been included in DIN 3998 becausethedefinitions and specification factors are laid down in DIN 868, DIN 3960, DIN 3971 and DIN 3975. Standardization of the denominations in all DIN standards dealing with gear teeth is envisaged on the basis of the present survey DIN 3998. Some of the illustrations have been taken from the standards VSM 15 522 and NEN 5276 with the approval of the Swiss Standards Association and the Netherlands Standards Institution respectively . *) Obtainable through DIN Deutsches Institut fr Normung e.V., Berlin
