1、UDC 621.833 : 001.4 DEUTSCHE NORMEN September 1976 . Denominations on Gears and Gear Pairs General Definitions DIN 3998 Part 1 Benennungen an Zahnrdern und Zahnradpaaren; Allgemeine Begriffe This Standard contains the denominations of the international dictionary of definitions for gear tooth geomet
2、ry, 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. Supple- mentary Sheet 1 to DIN 3998 lists the keywords of
3、 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. Thesequenceof thedenominationsand theconsecutive numbering in DIN 3998 Part 1 to Part 4 agree with
4、ISO/R 1122. The denominations are stated in English and French. Contents 1 General definitions 2 1.1 Kinematic definitions 2 1 .I .I Relative position of axes. . 2 1.1.2 Matinggears., . 4 Ser. No, Page 1.1.3 Relative speeds . 5 1 .I .4 Pitch and reference surfaces 6 1.2 Teeth characteristics. 6 1.2.
5、1 Dimensions and coefficients 6 1.2.2 Tip and root surfaces . 7 1.2.3 Flanks and profiles 8 1.2.4 Flanks-qualifications . 9 1.2.5 Parts of flanks .IO 1.2.6 Definitions in terms of tooth traces . 10 1.3 Tooth generation .I2 of the flank shape .I2 1.3.1 1.3.2 Definitions in termsof tooth generation .
6、.I3 1.4 Geometrical and kinemetical notions used in gears .I4 1.4.1 Geometrical lines . 14 1.4.2 Geometrical surfaces .I6 1.4.3 Instantaneous axis .I6 Generating gear, interference and modification Continued on pages 2 to 17 Explanations on page 17 Alleinverkauf der Normen durch Beuth Verlag GmbH. B
7、erlin 30 und Kln 1 07.79 DIN 3998 Teil 1 engl. Preisgr. 1 1 Vertr.-Nr. O1 11 Page 2 DIN 3998 Part 1 Denomination General definitions Definitions gnrales Kinematic definitions Dfinitions cinmatiques Relative position of axes Position relative des axes Toothed gear Roue dengrenage Gear pair Engrenage
8、Train of gears Train dengrenages Gear pair with parallel axes Engrenage parallle Gear pair with intersecting axes Engrenage concourant Examples of design 1) Number according to ISO/R 11 22 DIN 3998 Part 1 Page 3 Denomination Gear pair with non-parallel non-intersecting axes Engrenage gauche Centre d
9、istance Entraxe Shaft angle Angle des axes Epicycloidal or planetary gear train Train plantaire ou picycloidal Examples of design 1) See page 2 Page 4 DIN 3998 Part 1 Denomination Mating gears Roues conjugues Ma ring gear Roue conjugue Pinion Pignon Wheel or gear Roue Driving gear Roue menante Drive
10、n gear Roue mene Sun gear Roue solaire Ring gear Couronne de train plantaire ion 1) See page 2 DIN 3998 Part 1 Page 5 No.) Ser. I Denomination 1.1.2.8 Planet gear Roue plantaire 1.1.3 1.1.3.1 1.1.3.2 1.1.3.3 1.1.3.4 1.1.3.5 1.1.3.6 Rela tive speeds Vitesses relatives Gear ratio Rapport dengrenage Tr
11、ansmission ratio Rapport de transmission Speed reducing gear pair (or train) Engrenage (ou train) rducteur Speed increasing gear pair (or train) Engrenage (ou train) multiplicateur Speed reducing ratio Rapport de rduction Speed increasing ratio Rapport de multiplication Examples of design 1) See pag
12、e 2 Page 6 DIN 3998 Part 1 Ser. No. 1.1.4 1.1.4.1 1.1.4.2 1.1.4.3 1 .I .4.4 12 1.2.1 1.2.1 .I 1.2.1.2 1.2.1.3 1.2.1.4 1.2.1.5 Denom i nat io n Pitch and reference surfaces Surfaces primitives Pitch surface Surface primitive de fonctionnement Reference surface Surface primitive de rfrence Reference .
13、 . . . . . de rfrence Working . . . . de fonctionnement Examples of design I Teeth characteristics Caractristiques de denture Dimensions and coefficients Dimensions et coefficients Gear tooth Dent Tooth space Entredent Dimensions Dimensions Module Module Diametral pitch Diametral Pitch Reduced value
14、 of a dimension Valeur dduite dune dimension 1) See page 2 DIN 3998 Part 1 Page 7 Ser. No. 1) 1.2.2.1 1.2.2.2 1.2.2.3 1.2.2.4 1.2.2.5 Denomination Examples of design Tip and root surfaces Surfaces de tte et de pied Tip surface Surface de tte Crest Sommet Root surface Surface de pied Bottom of the to
15、oth spaces Fond des entredents Internal gear Roue intrieure External gear pair Engrenage ext6rieur 1) See page 2 Page 8 DIN 3998 Part 1 I Ser. No.?) Denomination 1.2.2.6 Internal gear pair Engrenage intrieur 1.2.3 1.2.3.1 1.2.3.2 1.2.3.3 1.2.3.4 1.2.3.5 Flanks and profiles Flancs et profils Tooth fl
16、ank Flanc Tooth trace Ligne de flanc Tooth profile Profil Transverse profile Profil apparent Normal profile Profil rel Examples of design 1) See page 2 DIN 3998 Part 1 Page 9 Ser. No.) 4 C) C Denomination Examples of design AY; nrnfh I .L.J.U I rini-, J.“ Profil axial I Flanks-qualifications Qualifi
17、catifs de flancs Mating flank Flanc conjugu Right (or left) flank Flanc de droite (ou de gauche) Corresponding flanks Flancs homologues Opposite flanks Flancs an ti-homologues Working flank Flanc avant Non-working flank Flanc arrire 1) See page 2 Page 10 DIN 3998 Part 1 I Ser. No.) 1.2.5 1.2.5.1 1.2
18、.5.2 1.2.5.3 1.2.5.4 1.2.6 1.2.6.1 1.2.6.2 Denomination Parts of flanks Parties des flancs Addendum flank Flanc de saillie Dedendum flank Flanc de creux Active flank Flanc actif Usable flank Flanc utilisable Fillet Flanc de raccord Examples of design Definitions in terms of tooth traces Dfinitions e
19、n fonction des lignes des flanc Spur gear for gear pair) Roue droite (ou engrehge droit) cylindrique Straight bevel gear for gear pair) Roue droite fou engrenage droit) conique 1) See page 2 DIN 3998 Part 1 Page 11 Denomination Helical gear (or gear pair) Roue hlicodale (ou engrenage hlicoiclall Hel
20、ical bevel gear (or gear pair) Roue hlicodale (ou engrenage hlicodal) conique Right-hand teeth Denture droite Left-hand teeth Denture gauche Double helical gear (or gear pair) Roue (ou engrenage) en chevron Spiral gear lor gear pair) Roue (ou engrenage) spirale Examples of design 1) See page 2 Page
21、12 DIN 3998 Part 1 Denomination Tooth generation Gnration de la denture Generating gear, interference and modification of the flank shape Roue gnratrice, interfrence et modification de la forme du flanc Generating gear of a gear Roue gnratrice dune roue Meshing interference Interfrence dengrnement C
22、utter in terference Interfrence de taillage Tip relief Dpouille de tte Root relief Dpouille de pied Undercut Dgagement de pied Examples of design i? 1) Seepage2 DIN 3998 Part 1 Page 13 Ser. No. 1) 1.3.1.6 1.3.1.7 1.3.2 1.3.2.1 1.3.2.2 1.3.2.3 1.3.2.4 Denomination Crowning Bomb End relief Dpouille de
23、xtrmit Definitions in terms of tooth generation Dfinitions en fonction de la gnration de la denture Cylindrical gear Roue cylindrique Bevel gear Roue conique Cylindrical gear pair Engrenage cylindrique Bevel gear pair Engrenage conique Examples of design 1) See page 2 Page 14 DIN 3998 Part 1 Denomin
24、ation Ser. No.) 1.3.2.5 - Examples of design 1.3.2.6 1.3.2.7 1.3.2.8 1.3.2.9 1.4 1.4.1 1.4.1 .I Worm vis Worm wheel Roue vis Worm gear pair Engrenage vis Hypoid gear pair Engrenage h ypoie I Hypoid gear Roue h ypoie Geometrical and kinematical notions used in gears Notions gomtriques et cinmatiques
25、utilises dans les engrenages Geometrical lines Lignes cylindrical gears and gear pairs Denominations on gears and gear pairs; bevel and hypoid gears and gear pairs Denominations on gears and gear pairs; worm gear pairs 3998 Part 2 3998 Part 3 3998 Part 4 Denominations on gears and gear pairs; alphab
26、etical index of equivalent terms Explana fions 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 ad
27、ditional French denominations agree with the Recommendation issued by the International Organization for Standardization (ISO) ISO/R 1122 - 1969 *) Glossary of gears; geometrical definitions Vocabulaire des engrenages; definitions gomtriques In this Standard certain technical denominations additiona
28、l to those stated in ISO/R 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
29、definitions, Part 2 for cylindrical 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 Supple- mentary Sheet 1 to DIN 3998 the keywords of the denominations in English and French
30、 are listed in alphabetical order and with the serial number under which thedenominations 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 specification fact
31、ors for gears and gear 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 respectively. *) Obtainable through DIN Deutsches Institut fr Normung e.V., Berlin
