1、UDC 621.833.1 : 001.4 DEUTSCHE NORMEN September 1976 Denominations on Gears and Gear Pairs Cylindrical Gears and Gear Pairs - DIN 1 3998 I Pari 2 Benennungen an Zahnrdern und Zahnradpaaren; Stirnrder und Stirnradpaare (Zylinderrder und Zylinderradpaare) This Standard contains the denominations of th
2、e international dictionary of definitions for gear tooth geometry, 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 p
3、airs. Supplementary Sheet 1 to DIN 3998 lists the keywords of the terminology 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
4、the consecutive numbering in DIN 3998 Part 1 to Part 4 agree with ISO/R 11 22. The denominations are stated in English and French. Con ten is 2 Cylindrical gears and gear pairs . 2 Ser. No. Page 2.1 Cylindrical gears . 2 2.1.1 Cylinders . 2 2.1.2 Helices of helical gears 4 2.1.3 Addendum and dedendu
5、m . 6 2.1.4 Transverse dimensions 6 2.1.5 Normal dimensions (helical gears) . 7 2.1.6 Chords and base tangent length 8 2.1.8 Tooth generation . 1 O 2.1.9 Generating cutting tools . 11 2.2 Cylindrical gear pairs 12 2.2.2 Depths and clearances 13 2.2.3 Contact ratio (gear pairs with parallel axes) 14
6、2.2.4 Length of path of contact (involute gear pairs with parallel axes) 15 2.2.5 Addendum and centre distance modifications . 16 2.1.7 Typesof cylindrical gears 9 2.2.1 Types of cylindrical gear pairs . 12 Continued on pages 2 to 17 Explanations on page 17 DIN 3998 Teil 2 engi. Prekgr. 11 einverkau
7、f der Normen durch Beuth Verlag GmM, Berlin 30 und Kln 1 07.79 Vertr.-Nr. O1 11 Page 2 DIN 3998 Part 2 Ser. No.) 2 2.1 2.1.1 2.1.1.1 2.1.1.2 2.1 . 1 .3 2.1.1.4 Denomination Cylindrical gears and gear pairs Roues et engrenages cylindriques Cylindrical gears Roues cylindriques Cylinders Cylindres Refe
8、rence cylinder Cylindre primitif de rfrence Pitch cylinder Cylindre primitif de fonctionnement Tip cylinder Cylindre de tete Root cylinder Cylindre de pied Transverse profile Profil (profil apparent) Examples of design 1 ) Number according to ISO/R 11 22 DIN 3998 Part 2 Page 3 Ser. No. 1) 2.1.1.5 -
9、2.1.1.6 2.1.1.7 - See pa5 Denomination Reference circle Cercle primitif de rfrence Pitch circle Cercle primitif de fonctionnement Reference diameter Diamtre primitif de rfrence Pitch diameter Diamtre primitif de fonctionnement Tip circle Cercle de tte Root circle Cercle de pied 2 Examples of design
10、Tip circle Root circle Root circle Tip circle Page 4 DIN 3998 Part 2 Ser. No. 1) 2.1.1.8 2.1.1.9 2.1.2 2.1.2.1 2.1.2.2 2.1.2.3 Denomination Tip diameter Diamtre de tte Root diameter Diamtre de pied Facewidth Largeur de denture Examples of design Tip circle Root circle I t-t Helices of helical gears
11、Hlices de roues hlicodales Reference helix Hlice primitive de rfrence Pitch helix Hlice primitive de fonctionnement Base helix Hlice de base 1 ) See page 2 DIN 3998 Part 2 Page 5 Denomination Helix angle Angle dhlice Base helix angle Angle dhlice de base Lead angle Inclinaison Base lead angle Inclin
12、aison de base Lead Pas hlicoidal Axial pitch Pas axial Examples of design ,_-. 1 ) See page 2 Page 6 DIN 3998 Part 2 No. Ser. 1) I Denomination Saillie et creux 2.1.3.1 Tooth depth Hauteur de dent 2.1.3.2 I Addendum Saillie 2.1.3.3 Dedendum Creux 2.1.4 2.1.4.1 2.1.4.2 2.1.4.3 2.1 A.4 - Transverse di
13、mensions Dimensions apparentes Transverse pressure angle at a point Angle dincidence apparent Transverse pressure angle Angle de pression apparent Transverse pitch Pas apparent Angular pitch Pas angutaire Examples of design IA 1 ) See page 2 DIN 3998 Part 2 Page 7 Denomination Ser. No. 1) Examples o
14、f design 2.1.4.5 Transverse spacewidth Intervalle apparent 2.1.4.6 t 2.1.4.7 2.1.4.8 2.1.5 2.1.5.1 2.1 5.2 2.1.5.3 2.1.5.4 2.1 5.5 Transverse module Module apparent Transverse diametral pitch Diametral pitch apparent Transverse tooth thickness Epaisseur apparente I Normal dimensions (helical gears)
15、Dimensions relles (roues hlicoiales) incidence rel Normal pressure angle Angle de pression rel Normal pitch Pas rel Normal module Module rel Normal diametral pitch Diametral pitch rel 1 ) See page 2 Page 8 DIN 3998 Part 2 Denomination Normal tooth thickness Ser. No.) Examples of design 2.1.5.6 Epais
16、seur relle 2.1.5.7 Normal spacewidth Intervalle rel 2.1.6 2.1.6.1 2.1.6.2 2.1.6.3 2.1.6.4 2.1.6.5 Chords and base tangent length Cordes et cartement Normal chordal tooth thickness Corde Chordal height Saillie la corde Constant chord Corde constante M Constant chord height Saillie la corde constan te
17、 Base tangent length Ecartement 1 1 See page 2 DIN 3998 Part 2 Page 9 Denomination Types of cylindrical gears Types de roues cylindriques Rack Crmailire Cycloidal gear Roue cyclodale Cylindrical lantern gear Roue cylindrique fuseaux Involute cylindrical gear Roue cylindrique dveioppante Base circle
18、Cercle de base Base cylinder Cylindre de base Examples of design I ,I I h 1) See page 2 Page 10 DIN 3998 Part 2 Denom inat ion Ser. No. 1) Examples of design 2.1.7.7 2.1.7.8 2.1.7.9 Base diameter Diamtre de base Transverse base pitch Pas de base apparent Normal base pitch Pas de base rel Transverse
19、this also contains possible points of contact outside the limits of the length of path of contact concerned. See DIN 868 and DIN 3960. 3) In ISO/R 1122 - 1969 the associated total arc of transmission is defined. Since however the pitch circles are the criterion for the contact conditions of a spheri
20、cal gear pair, a departure was made in this case from the IS0 definition. DIN 3998 Part 2 Page 1 5 Total contact ratio Rapport total de conduite Ser. No. 1) I I 2.2.3.6 2.2.3.7 2.2.3.8 2.2.3.9 2.2.4 2.2.4.1 2.2.4.2 2.2.4.3 Denomination Examples of design Overlap angle Angle de recouvrement overlap a
21、rc 3) Arc de recouvrement 1 Transverse contact ratio Rapport de conduite apparent Overlap ratio Rapport de recouvrement Length of path of contact (involute gearpairs with parallel axes) Longueur de conduite (engrenages paralleles dveloppan te) Plane of action Plan daction Length of path of contact 2
22、) Longueur de conduite Approach contact Contact dapproche 1 ) See page 2 2) and 3) see page 14 4) In ISO/R 1122 - 1969 the illustrations of Serial No. 2.2.4.2 and Serial No. 2.2.4.6 have been transposed. Page 16 DIN 3998 Part 2 I Ser. No. 1) 2.2.5.4 2.2.5.5 2.2.4.4 Gear pair with reference centre di
23、stance Engrenage entraxe de rfrence Gear pair with modified centre distance Engrenage entraxe modifi 2.2.4.5 2.2.4.6 2.2.4.7 Denom ination Examples of design I Recess contact Contact de retraite - Length of approach path Longueur dapproche Length of recess path Longueur de retraite Overlap length Lo
24、ngueur de recouvrement 2.2.5 Addendum and centre distance modifications Dport et modification dentraxe 2.2.5.1 X-zero gear pair Engrenage sans dport 2.2.5.2 X-gear pair Engrenage avec dport 2.2.5.3 Reference centre distance Entraxe de rfrence I i 2.2.5.6 Centre distance modifica tion coe f ficien i
25、Coefficient de modification dentraxe 1) See page 2 DIN 3998 Part 2 Page 17 Other rele vant standards DIN 3960 Definitions and specif ication factors for cylindrical gears and cylindrical gear pairs with involute gear teeth DIN 3998 Part 1 Denominations on gears and gear pairs; general definitions DI
26、N 3998 Part 3 Denominations on gears and gear pairs; bevel and hypoid 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 tee
27、th Explanations This Standard lays down the English technical terminology relating to gear teeth in order to facilitate understanding and orderly 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 a
28、gree with the Recommendation issued by the International Organization for Standard- ization (ISO) ISO/R 1122 - 1969 *) Glossary of gears; geometrical definitions Vocabulaire des engrenages; dfinitions gomtriques In this Standard certain technical denominations additional to those stated in ISO/R 11
29、22 - 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 cyl
30、indrical 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 arelisted in alphabetical or
31、der 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 12 522 also - not only the denominations but also the definitions for geometrical specifi- cation factors for gears and gear
32、pairs. The definitions have not been included in DIN 3998 because the definitions 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 respect ive1 y. *) Obtainable through DIN Deutsches Institut fr Normung e.V., Berlin
