1、UDC 621.833.38 : 001.4 DEUTSCHE NORMEN SeDtember 197 Denominations on Gears and Gear Pairs Worm Gear Pairs I 3998 Pari 4 Benennungen an Zahnrdern und Zahnradpaaren; Schneckenradstze This Standard contains the denominations of the international dictionary of definitions for gear tooth geometry, Part
2、1 being concerned with general denominations, Part 2 with cylindrical gears and cylindrical gear pairs, Part 3 with bevel gears and bevel gear pairk 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 of the denomi
3、nations 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 Part 1 to Part 4 agree with ISO/
4、R 11 22. The denominations are stated in English and French. Contents Ser. No. Page 4 Wormgearpairs . 2 4.1 General . 2 4.1.2 Terminology for worm gear pairs and their wheels 2 4.2 Worm (cylindrical) 3 4.2.1 Reference elements 3 4.2.2 Pitch, addendum, dedendum 4 4.2.3 Main form of the flanks . 5 4.3
5、 Wormwheels (cylindrical) (for shaft angle 90“) . 6 4.3.1 Reference elements 6 4.3.2 Reference and overall dimensions . 8 4.3.3 Working elements . 10 4.3.4 Addendum, dedendum 10 . 4.1.1 Toric surfaces and lines . 2 4.4 Worm gear pairs (cylindrical) (Shaft angle 90“) . 11 4.4.1 Gear ratio, depth and
6、clearance 11 4.4.2 Equivalent basic rack of an open gear pair . 11 Continued on pages 2 to 12 Explanations on page 12 Alleinverkauf der Normen durch Beuth Verlag GmbH. Berlin 30 und Kln 1 07.79 DIN 3998 Teil 4 engl. Preisgr. 8 Vertr.-Nr. O108 Page 2 DIN 3998 Part 4 1 Ser. No.) 4 4.1 4.1.1 4.1.1.1 4.
7、1.1.2 4.1.1.3 4.1.1.4 4.1 .I .5 - 4.1.2 4.1.2.1 4.1.2.2 Denomination Worm gear pairs Engmnages vis General Gnralits Toric surfaces and lines Surfaces et lignes toriques I Toroid Tore Generant of the toroid Cercle snrateur du tore Mid-plane of the toroid Plan mdian du tore Middle circle of the toroid
8、 Cercle moyen du tore Inner circle of the toroid Cercle intrieur du tore Examples of design Generant Middle circle / I Mid-plane Terminology for worm gear pairs and their wheels Dnomination des engrenages vis etdeleurs roues (cylindrical) worm Vis (cylindrique) (Cylindricall worm wheel Roue vis (cyl
9、indrique) 1) According to ISO/R 1122 - 1969/Add. 2 - 1972 DIN 3998 Part 4 Page 3 - Ser. No. 1) 4.1.2.3 4.1.2.4 4.1.2.5 4.1 -2.6 4.2 4.2.1 4.2.1.1 4.2.1.2 (Cylindrical) worm gear pair Engrenage vis (cylindrique) Enveloping worm Vis globique Enveloping wormwheel Roue vis globique Double enveloping wor
10、m gear pair Engrenage vis globique Examples of design Worm (cylindrical) Vis (c ylindrique) Reference elements Elments de rfrence Thread Filet Reference cylinder Cylindre de rfrence 1 1 See page 2 Page 4 DIN 3998 Part 4 Worm facewidth Longueur de vis Ser. No.) t 4.2.1.3 4.2.1.4 4.2.1.5 4.2.2 4.2.2.1
11、 4.2.2.2 4.2.2.3 4.2.2.4 4.2.2.5 4.2.2.6 Denomination Examples of design Reference diameter Diamtre de rfrence Reference helix Hlice de rfrence Pitch, addendum, dedendum Pas, saillie, creux Axial profile Profil axial Lead Pas hlicodal Axial pitch Pas axial Axial module Module axial Axial diametral p
12、itch Diametral pitch axial Diametral quotient Quotient diamtral 1) See page 2 DIN 3998 Part 4 Page 5 Ser. No. 1) 4.2.2.7 4.2.2.8 4.2.2.9 4.2.3 4.2.3.1 4.2.3.2 Denomination Examples of design Tooth depth Hauteur de dent Addendum Saillie Dedendum Creux Main form of the flanks Principales formes des fl
13、ancs Straight sided axial worm (type ZA) Flancs dfinis en profil axial (type ZA) Straight sided normal worm (type ZNJ Flancs dfinis en profil normal (type ZN) Cutting tool _ Geargenerator Cutting tool Milling cutter 1 ) See page 2 Ser. No. 1) 4.2.3.3 4.2.3.4 4.3 4.3.1 Denomination Mille helicoid wor
14、m (type ZK) Flancs engendrs par outil disque (type ZKI Involute helicoid worm (type 21) Flancs en hlicode dveloppable (type Zl) Examples of design 1 ) See page 2 DIN 3998 Part 4 Page 7 Denomination Mid-plane Plan mdian Reference toroid Tore de rfrence Tip surface Surface de tte Tip cylinder Cylindre
15、 extrieur Gorge Gorge Root toroid Tore de pied Examples of design 1) See page 2 Page 8 DIN 3998 Part 4 Denomination Ser. No. 1) Examples of design 4.3.1.7 4.3.1.8 4.3.1.9 4.3.2 4.3.2.1 4.3.2.2 4.3.2.3 Circle at root of gorge Cercle fond de gorge Root circle Cercle de pied Reference and overall dimen
16、sions Dimensions de rfrence et dencombrement Tip diameter Diamtre extrieur Diameter at root of gorge Diamtre fond de gorge Root diameter Diamtre de pied 1 ) See page 2 DIN 3998 Part 4 Page 9 Ser. No.) 4.3.2.4 4.3.2.5 4.3.2.6 4.3.2.7 4.3.2.8 Denomination Reference diameter Diamtre de rfrence Referenc
17、e pitch Pas de rfrence Face width Largeur de denture Width angle Angle de largeur Gorge radius Rayon de gorge Examples of design 1) See page 2 Page 10 DIN 3998 Part 4 Ser. No.) 4.3.3 4.3.3.1 4.3.3.2 4.3.3.3 4.3.3.4 4.3.3.5 4.3.4 4.3.4.1 4.3.4.2 Denomination Working elements Elments de fonctionnement
18、 Pitch circle Cercle de fonctionnement Pitch diameter Diamtre de fonctionnement Pitch Pas Addendum modification Dport Addendum modification coefficient Coefficient de dport Examples of design I Addendum, dedendum Saillie, creux Tooth depth Hauteur de dent Reference addendum Saillie de rfrence 1) See
19、 page 2 DIN 3998 Part 4 Page 11 Ser. No. 1) 1 I Denomination Examples of design 4.3.4.4 4.3.4.3 Reference dedendum Creux de rfrence Working addendum Saillie de fonctionnement 4.4.2 4.4.2.1 Equivalent basic rack of an open gear pair Engrenage roue-crmaillre quivalent Equivalent wheel gear pair Engren
20、age roue-crmaillre quivalent I I 4.3.4.5 Working dedendum Creux de fonctionnement 4.4 4.4.1 4.4.1.1 4.4.1.2 4.4.1.3 4.4.1.4 4.4.1.5 Worm gear pairs (CylindricalJ (Shaft angle 90“) Engrenages vis (cylindrique) (Angle des axes 9PJ Gear ratio, depth and clearance Rapport, hauteurs et jeux Gear ratio Ra
21、pport dengrenage Working depth Hauteur u tile Bottom clearance Vide fond de dent Circum ferentil backlash Jeu primitif Normal backlash Jeu entre dents Page 12 DIN 3998 Part 4 Other relevant standards DIN 3975 Definitions on cylindrical worm gear pairs with shaft angle 90 DIN 3998 Part 1 Denomination
22、s on gears and gear pairs; general definitions DIN 3998 Part 2 Denominations on gears and gear pairs; cylindrical gears and gear pairs DIN 3998 Part 3 Denominations on gears and gear pairs; bevel and hypoid gears and gear pairs DIN 3998 Supplementary Sheet 1 Denominations on gears and gear pairs; al
23、phabetical index of equivalent terms DIN 3999 Symbols for gear teeth Explana rions This Standard lays down the English technical terminology relating to gear teeth in order to facilitate unterstanding and orderly arrangement of terms. The sequence of technical terms and their consecutive numbering i
24、n Part 1 to Part 4 as well as the additional French denominations agree with the Recommendation issued by the International Organization for Standard- ization (ISO) ISO/R 1122-1969/Add.2-1972*) Glossary of gears; geometrical definitions, worm gears Vocabulaire des engrenages; definitions geometrique
25、s, engrenages a vis In this Standard certain technical denominations additional to those stated in ISO/R 11 22 - 1969/Add. 2 - 1972 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 cas
26、es the non-bracketed terms are the ruling ones. DIN 3998 is subdivided into Part 1 for general 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,
27、 in Supplementary Sheet 1 to DIN 3998 the keywords of the denominations in English and French are listed in alphabetical order and with the serial number under which the denominations appear in Part 1 to Part 4. Recommendation ISO/R 1122 - 1969/Add. 2 - 1972 contains - like,for example, the Swiss St
28、andard VSM 15 522 also -not only thedenominations but also thedefinitionsfor geometrical specification factors for gears and gear pairs. The definitions have not been included in DIN 3998 because the definitions and specificationfactors are laiddown in DIN 868, DIN 3960, DIN 3971 and DIN 3975. Stand
29、ardization 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
