1、UDC 621.833.2 : 744.426 DEUTSCHE NORMEN August 197 Information on Gear Teeth in Drawings Information on Straight Bevel Gear Teeth DIN 3966 Part 2 Angaben fr Verzahnungen in Zeichnungen; Angaben fr Geradzahl-Kegelradverzahnungen In this Standard the information contained in the International Standard
2、 IS0 1341 - 1976 has been adopted analog- ously and supplemented by additional data. For provisions relating to the representation of gears in drawings see DIN IS0 2203. This Standard contains only such information as is necessary and adequate, apart from the usual data on material, heat treatment a
3、nd hardness, for clearly denoting the straight bevel gear teeth in manufacturing drawings. If neces- sary, further details may be added, e. g. if the gearcutting or manufacturing method to be applied, or agreements on testing and acceptance, make this necessary. The terms, designations and symbols u
4、sed agree with DIN 3971 (subsequent edition at present still in draft form), DIN 3998 Part 3 and DIN 3999. O 1 1.1 1.2 1.3 1.4 1.5 1. 1. 1. 1. I. O D D D D Length dimensions in mm Con tents Page Page Other relevant Standards. 1 2 Data in separate table . 2 Dimensions and symbols in the drawing . 2 2
5、.1 Nominal dimensions of gear teeth . 2 Tip diameter with allowances. . 2 2.2 Gear tooth tolerances and their test dimensions 3 F acewidth 2 2.3 Gearpairing . 3 Tip angle . 2 Complementof backconeangle. . 2 3 Data on preparatory treatment 3 ComDlement of the inner cone anale Anwenderinformation Die
6、Originalfassung der Norm enthlt Elemente, z.B. farbige Abbildungen oder Tabellen, die in dieser gescannten Form der Norm nicht originalge- treu darstellbar sind. Dies mu bei der Anwendung den jeder DIN-Norm ist deren Originalfassung mit id gear lear bercksichtigt werden. Magebend fr das Anwen- dem n
7、euesten Ausgabedatum. Vergewissern Sie sich bitte in den DIN-Mitteilungen, im .aktuellen .m) ion sition; DIN-Katalog mit dem neuesten Ergnzungsheft IS oder in der aktuellen Ausgabe der PERINORM. ;2t06 Explanations on page 6 DIeaaIe rightsof German Siandarda(D1N-Normen) are with BeuthVerlag GmbH, Ber
8、lin30 DIN 3966 Teil 2 engl. Preisgr. 11.91 Vertr.-Nr. O106 UDC 621.833.2 : 744.426 DEUTSCHE NORMEN August 197 Information on Gear Teeth in Drawings Information on Straight Bevel Gear Teeth DIN 3966 Part 2 Angaben fr Verzahnungen in Zeichnungen; Angaben fr Geradzahl-Kegelradverzahnungen In this Stand
9、ard the information contained in the International Standard IS0 1341 - 1976 has been adopted analog- ously and supplemented by additional data. For provisions relating to the representation of gears in drawings see DIN IS0 2203. This Standard contains only such information as is necessary and adequa
10、te, apart from the usual data on material, heat treatment and hardness, for clearly denoting the straight bevel gear teeth in manufacturing drawings. If neces- sary, further details may be added, e. g. if the gearcutting or manufacturing method to be applied, or agreements on testing and acceptance,
11、 make this necessary. The terms, designations and symbols used agree with DIN 3971 (subsequent edition at present still in draft form), DIN 3998 Part 3 and DIN 3999. Length dimensions in mm Con tents Page O Other relevant Standards. 1 1 Dimensions and symbols in the drawing . 2 1.1 Tip diameter with
12、 allowances. . 2 1.2 Facewidth 2 1.3 Tipangle . 2 1.5 Complement of the inner cone angle (if required) . 2 1.6 Denoting the reference element 2 1.7 Concentricity and camming tolerance of the gear body 2 1.8 Axial distances from the reference face . 2 1.9 Symbols of surfaces for the tooth flanks to D
13、IN IS0 1302 or DIN 3141 2 1.10 Denoting the working flank in the trans- verse section (if required) 2 1.4 Complement of back cone angle 2 . 2 2.1 2.2 2.3 3 4 4.1 4.2 4.3 Page Data in separate table . 2 Nominal dimensions of gear teeth . 2 Gear tooth tolerances and their test dimensions 3 Gear pairin
14、g . 3 Data on preparatory treatment 3 Examples for Tables according to Section 2 3 Table for a straight bevel gear having the reference cone apex coincident with the tip cone apex 3 Table for a straight bevel gear for con- stant clearance . 4 Table for a straight bevel gear with con- stant tooth dep
15、th . 5 Other relevant Standards DIN IS0 1302 Technical drawings; indication of sur- DIN 3998 face condition in drawings DIN IS0 2203 Technical drawings; representation of gears DIN 3141 (Preliminary Standard) Surface symbols in drawings; assignment of peak-to-valley heigts meters for bevel gears and
16、 bevel gear pairs DIN 3999 DIN 7168 DIN 3971 (Draft May 1978) Definitions and para- DIN 7184 Part 3 Denominations on gears and gear pairs; bevel and hypoid gears and gear pairs Symbols for gear teeth Part 2 (at present still in draft form) General tolerances, form and position Part 1 Tolerances of f
17、orm and position; definitions; indications on drawings Continued on pages 2 to 6 Explanations on page 6 Solesale rightsof German Siandards(D1N-Normen) are with BeuthVerlag GmbH, Berlin30 11.91 DIN 3966 Teil 2 engl. Preisgr. Vertr.-Nr. O106 Page 2 DIN 3966 Part 2 A A Figure 1. Dimensions and symbols
18、in the drawing 1 Dimensions and symbols in the drawing 1.1 Tip diameter with allowances 1.2 Facewidth 1.3 Tip angle 1.4 Complement of back cone angle 1.5 Complement of the inner cone angle (if required) 1.6 Denoting the reference element The reference element for concentricity and camming tolerancin
19、g is the gear axis. The method of indicating shall be in accordance with DIN 7184 Part 1. 1.7 Concentricity and camming tolerance of the gear body Where the reference to general tolerances according to DIN 7168 Part 2 *) is not sufficient, concentricity and camming tolerances to DIN 7184 Part 1 are
20、to be speci- fied. The test locations are to be designated. In detail the following are to be indicated: Permissible concentricity deviation of the tip cone sur- face or of special test surfaces relative to the centre of the borehentre of the journal or relative to the bore envelopejournal envelope;
21、 the plane of measurement is to be stated if necessary. Permissible camming of a face, which is thereby declared to be the reference face, or of special test faces relative to the centre of the borehentre of the journal or relative to the bore envelope/journal envelope; the measuring circle is to be
22、 stated if necessary. If required, the permissible camming of a second face serving as an auxiliary plane is to be stated. Remark: If required, individual teeth on one side of a gear, which is declared in this way to be the front side, can be de- noted as tooth l and tooth 2, the counting direction
23、being specified at the same time (preferably in the clock- wise direction). The front side is the criterion for deter- mining the right flank and left flank, see DIN 868. 1.8 Axial distances from the reference face 1.8.1 Apex to back distance N o t e : In general, the actual apex to back distance is
24、 determined on the finished workpiece and indicated on the workpiece. 1.8.2 Outer tip distance 1.8.3 Inner tip distance 1.8.4 Auxiliary plane distance This is to be toleranced as necessary. 1.9 Symbols of surfaces for the tooth flanks to DIN IS0 1302or DIN 3141, if necessary for the tooth root and r
25、oot radiusing surfaces. 1 .IO Denoting the working flank in a transverse section (if required), e. g. by the note “working flank“, see DIN 868. 2 Data in separate table In a table those parameters are to be stated which are necessary, for the particular case concerned, for select- ing the tool produ
26、cing the gear teeth, for setting the gear tooth production machine and for testing the gear teeth. The table may either be incorporated in the drawing sheet or attached to the drawing as a separate sheet. The data apply to octoid gear teeth unless another gear tooth profile is stated; see Section 2.
27、2.3. 2.1 Nominal dimensions of gear teeth 2.1.1 Modulem The module mp on the crown gear reference circle is stated. N o t e : The International Standard IS0 678 “Straight bevel gears for general mechanical engineering and heavy machinery; modules and diametral pitches“ has not been adopted in the DI
28、N Standard because the bevel gear cutting machines operating by the planing method can have their tools set to any desired module. For straight bevel gears, therefore, standard module values are not provided. 2.1.2 Number of teeth z If the gear teeth on the workpiece consist only of one or more sect
29、ors, the number of teeth of the complete bevel gear tooth system shall be stated in the table, and additionally in brackets (optionally in the table or draw- ing) the number of teeth of the sectors. 2.1.3 Reference cone angle 6 2.1.4 Outer reference diameter de 2.1.5 Cone distance Re 2.1.6 Crown gea
30、r teeth zp 2.1.7 Tooth thickness half angle +p *) Subsequent edition at present still in draft form DIN 3966 Part 2 Page 3 Reference cone angle 2.1.8 Dedendum angle 6f or root angle 6, 2.1.9 Pressure angle at a point ap 2.2 Gear tooth tolerances and their test dimensions 2.2.1 Gear tooth quality Dat
31、a according to DIN 3965 Part 1 (at present still in draft form). Agreements on the quality of bevel gear teeth and their testing are to be made as necessary between the customer and the manufacturer of the bevel gears. 2.2.2 Tooth thickness and tooth thickness allowances In the Table the nominal dim
32、ension of the normal chordal tooth thickness in the back cone together with the allowances and the corresponding height above the chord are to be stated unless some other test dimension is specified. 2.2.3 Supplementary data When required, supplementary data can be indicated, e. g. regarding the sta
33、ndard basic rack tooth profile. It may also be necessary to fix provisions regarding non- geometrical parameters. In the case of plastic gears it may be necessary, for example, to provide data regard- ing storage at certain temperatures. 2.3 Gear pairing The pairing of gears in gear transmissions ca
34、n be indi- cated in the Table by the following data: 2.3.1 Reference number of the mating gear 2.3.2 Number of teeth z of the mating gear 2.3.3 Shaft angle 2 in the transmission housing with allowances 24,5?0 (24“3+42“) 3 Data on preparatory treatment If necessary, data regarding preparatory treatme
35、nt (machining allowances, measured quantities) may be inserted in a special panel. 26.57 Tooth thickness half angle 4% Dedendum angle f 4 Examples for Tables according to Section 2 4.1 Table for a straight bevel gear having the reference cone apex coincident with the tip cone apex 2,710 Z0 4.2 36“ 2
36、,390 2 47 24“) Straight bevel gear Pressure angle at a point Gear tooth quality aP Module mP I 3,2 zoo - Number of teeth z I 16 Outer reference diameter 51 (20 Cone distance Crown gear teeth zp I 38,48376 Dr root angle 6f I Normal chordal tooth - 0.03 ! i; thickness in the backcone I srsl 0,08 - 4,3
37、s I225 .Q O L/ Height above chord h .U- Additional gear tooth tolerances and test data Mating Reference number 54 32.1 Shaft angle in housing with allowances 90 2 0,03O Supplementary data (if required): 5.825 4.228 Standard basic rack tooth profile I- 64 4 Figure 2. Drawing relating to example accor
38、ding to Section 4.1 Page 4 DIN 3966 Part 2 4.2 Table for a straight bevel gear for constant clearance u) Eu. a E .g E z ;5; Straight bevel gear Module mP Normal chordal tooth thiCKneSS in the back cone 7 Height above chord h - Number of teeth 2 Reference cone angle 6 Outer reference diameter de Cone
39、 distance Re Crown gear teeth ZP Tooth thickness half angle 4p Dedendum angle Of or root angle 6, Pressure angle at a point UP Gear tooth quality Additional gear tooth tolerances and test data Shaft angle in housing with allowances c Supplementary data (if required): 4,233 21 45O 88,90 62, %b2 zoo 4
40、,32 789.03 21 wo* O,OZSO /i / 18,SC b=2-Ji - Figure 3. Drawing relating to example according to Section 4.2 DIN 3966 Part 2 Page 5 4.3 Table for a straight bevel gear with constant tooth depth Straight bevel gear Wodule mP Number of teeth 2 Reference cone angle 6 3uter reference diameter de Cone dis
41、tance Crown gear teeth ZP Tooth thickness half angle p Dedendum angle 4 3r root angle 6f _ Pressure angle at a point UP Gear tooth quality thickness in the back cone S - - Additional gear tooth tolerances and test data ,lating Reference number Shaft angle in housing with allowances L Supplementary d
42、ata (if required): 3,32 20 (3605855” 36,982O 66,40 55,489 33,ZWSS 36,9820 ZOO ( 3658 55? 2.5 281 /2 33 Figure 4. IDrawing relating to example according to section 4.3 Page 6 DIN 3966 Part 2 Further Standards DIN 868 General definitions and parameters for gears, gear pairs and gear trains DIN 3965 Pa
43、rt 1 (at present still in draft form) Tolerances for bevel gear teeth, bases DIN 3966 Part 1 Information on gear teeth in drawings; information on involute teeth for cylindrical gears Explanations This Standard includes the data from the International Standard IS0 1341 - 1976 which has been suppleme
44、nted by additional particulars. DIN 3966 Part 2 supersedes DIN 869 Part 2, March 1931 edition. The definitions and parameters in this Standard relate to DIN 3971 “Definitions and para- meters for bevel gears and bevel gear pairs“ (subsequent edition at present still in draft form). The designations
45、have been coordinated with DIN 3998 Part 3 “Designations of gears and gear pairs; bevel gears and bevel gear pairs, hypoid gears and hypoid gear pairs“, and the symbols with DIN 3999 “Symbols for gear teeth“. Only one basic type has been used for the examples of data in the Table; this is intended t
46、o be used as far as possible as an example for all cases. For the angle dimensions occurring in the Table data the units stated should be the degree with decimal subdivision and, in brackets, the units degreee, minutes and seconds. For angle dimen- sions in calculation sheets it may be found in syst
47、ems with a limited stock of symbols (tele- printers, data processing) that the unit symbols for degree, minute and second cannot be repre- sented by the superscript symbols o “. For such cases DIN 66 030 “Representation of unit names in systems with a limited stock of characters“ (subsequent edition at present still in draft form) provides for the following representations of the unit names: deg or DEG for degree (angle) mnt or MNT for minute (angle) sec or SEC for second (angle). For further abbreviations of the unit names, d, m and s are recommended, e. g. 2d42m36s.
