1、UDC 621.833.1-213 621.753.1 DEUTSCHE NORMEN November 1980 Deviations of Shaft Centre Distances and Shaft Position Tolerances of Casings for Cylindrical Gears 1 DIN 3964 z : 2 E 2 o - o L B Achsabstandsabmasse und Achslagetoleranzen von Gehusen fr Stirnradgetriebe 3 Shaft centre distance deviations T
2、he IS0 tolerance zones js 5 to js 11 in accordance with ISO/R 286 - 1962 are used for the shaft centre distance deviations. They are, therefore, dependent on the nominal dimension of the shaft centre distance. In addition, the accuracy class of the shaft position is correlated, see Section 4. Table
3、1. Shaft centre distance deviations A, and A, in prn 1 Field of application The data in this Standard apply to the deviations defined in DIN 3960, viz.: - Shaft centre distance deviation A, - Shaft centre distance tolerance Ta A distinction is made between the upper deviation A, (+) and the lower de
4、viation A, (-). Accuracy class of shaft position 4 to 6 see also note 3. - Shaft inclination fx, - Shaft skew fxp over 10 upto 18 over 18 UP to 30 over 30 2 Other relevant standards DIN 3960 DIN 3962 Part 2 DIN 3967 Definitions and parameters for cylindrical gears and cylindrical gear pairs with inv
5、olute teeth Tolerances for cylindrical gear teeth; tolerances for tooth trace deviations System of gear fits; backlash, tooth thickness deviations and tooth thickness tolerances; bases ISO-Tolerance zone js 5 6 7 8 9 10 11 + 4 + 5.5 +9 + 13,5 + 21.5 + 35 + 55 4 - 5.5 -9 - 13.5 - 21,5 - 35 - 55 + 4.5
6、 + 6.5 + 10.5 + 16,5 + 26 + 42 + 65 - 4.5 - 6.5 - 10,5 - 16,5 - 26 - 42 - 65 + 5.5 +8 + 12.5 + 195 + 31 +50 + 80 up to 50 over 50 UP to 80 over 80 - 5;5 -8 - 1.215 - 19:5 - 31 - 50 -80 4 6.5 -t 9,5 + 15 + 23 + 37 +60 + 95 - 6,5 - 9,5 - 15 - 23 - 37 - 60 - 95 + 7.5 + 11 + 17.5 + 27 + 43.5 + JO + 110
7、upto 630 over 630 Upto 800 over 800 pto 1000 over 1000 upto 1250 over 1250 -14 - 22 - 35 - 55 - 87 - 140 - 220 + 16 + 25 f 40 + 62 f 100 + 160 + 250 -16 - 25 - 40 - 62 - 100 - 160 - 250 + 18 + 28 + 45 + 70 + 115 + 180 + 280 -18 , -28 - 45 - 70 - 115 - 180 - 280 + 21 + 33 + 52 + 82 + 130 -t 210 + 330
8、 -21 - 33 - 52 - 82 - 130 - 210 - 339 + 25 + 39 + 62 + 97 + 155 + 250 + 390 UP to 1600 -25 - 39 - 62 - 97 - 155 - 250 - 390 over 1600 + 30 +46 + 75 + 115 + 185 + 300 + 460 upto 2000 -30 - 46 - 75 - 115 - 185 - 300 - 460 over 2000 + 35 + 55 + 87 + 140 + 220 + 350 + 550 upto 2500 -35 - 55 - 87 - 140 -
9、 220 - 350 - 550 up to 3150 -43 - 67 - 105 - 165 - 270 - 430 -675 over 2500 +43 + 67 + 105 + 165 + 270 + 430 +675 Continued on pages 2 to 4 Sole sale rights of German Standards (DIN-Normen) ara with Beuth Verlag GmbH. Berlin 30 04.88 DIN 3964 engi. Preisgr. 4 Vertr.-Nr. O104 Page 2 DIN 3964 34 8 10
10、12 10 12 16 On the drawing, the shaft centre distance deviations may be entered both with their IS0 tolerance zone and also with their numerical value. The IS0 tolerance zone may in addition be entered in the gear tooth tables of the gears apper- taining to the drawings. In the case of gear transmis
11、sions in which one gear drives several other gears (or vice versa) e.g. in the case of epicyclic gear transmissions with several planet gears or in the case of transfer gearboxes or power take-off gears, it may become necessary to restrict the shaft centre distance deviations additionally by means o
12、f a permissible shaft centre distance fluctuation. This represents the range within which the shaft centre distances may differ within the tolerancing of a gear- box casing (or of a planet carrier). Permissible shaft centre distance fluctuations must be specified on the drawing or mutually agreed be
13、tween manufacturer and purchaser. The criterion for the minimum backlash of the gear teeth is the minimum dimension of the shaft centre distance in the case of external gear pairs, and the maximum dimension of shaft centre distance in the case of internal gear pairs. See DIN 3960, July 1980 edition,
14、 Section 9 and DIN 3967 for the effect of the shaft centre distance deviations on the backlash. The larger shaft centre distance deviations should preferably be allocated to the larger amounts of backlash, and the smaller deviations to the smaller amounts of backlash. 56 7 8 9 10 11 12 16 20 25 32 4
15、0 50 63 20 25 32 40 50 63 80 1- 4 Shaft position tolerances The shaft position tolerances are graded according to the R 10 preferred number series, with a differentiation according to the accuracy classes 1 to 12. They are dependent on the magnitude of the bearing centre distanceLG. The shaft posi-
16、tion accuracy class takes account of the gear tooth quality, but does not necessarily have to agree with it. - over 280 upto 560 over 560 up to 1000 over 1000 up to 1600 over 1600 up to 2500 over 2500 up to 3150 Table 2. Tolerances for shaft skew Pxcp and for shaft inclination fz6 (shaft position to
17、lerances) in pm 12 12 16 16 2o 2o 25 25 32 III2 8 up Over to 125 50 1 I over 125 I I upto 280 Shaft position accuracy class 32 1 :l. I 1 1 1: 1 80 I 100 1 125 I 160 1 200 1 250 40 100 125 160 200 250 320 The shaft inclination in respect of the casing seating surface or of the casing reference surfac
18、e is not toleranced by way of fz or fz. It should however not be disregarded in cases where precise alignment with the shafts of motors or machines to be coupled to the gearbox is required. Unless something to the contrary has been mutually agreed, an amount equal to five times the permissible shaft
19、 skew or shaft inclination applies. “Shaft skew fx and shaft inclination fz 6” shall be entered on the drawing of the casing in the manner indicated in the example of entering the particulars on the drawing. The added words “in accordance with DIN 3964“ in the middle box of the tolerance frame indic
20、ate that the position tolerances (deviating from DIN 7184) apply to the commonaxis formed by the two bores designated by indicating arrowheads. DIN 3964 Page 3 Entry on the drawing Example of entry of shaft position tolerances on a casing with: Bearing centre distance: 196 mm Shaft skew fzp in accor
21、dance with shaft position accuracy class 5 (in accordance with Table 2): 20 pm = 0.02 mm Shaft inclination fx6 in accordance with shaft position accuracy class 7 (in accordance with Table 2): 32 prn = 0.032 mm (refer to use of tolerance families in accordance with DIN 3961) Reference length L, to be
22、 entered (numerical value of bearing centre distance, rounded up): 200mm fq = 0,02/200 in accordance N O t e 1 : The shaft position tolerances selected for the casing (shaft position accuracy class and numerical values for f and fx6) may also be indicated in the drawings of the associated gears or i
23、n the table of the toothing data. N o te 2 : The shaft skew and the shaft inclination act upon the effective flank line angular deviation fH in accord- ance with DIN 3962 Part 2 in accordance with the following equations: Wherein: AfHp b Width of tooth face L, Bearing centre distance fz Shaft skew f
24、xs Shaft inclination aWt Working pressure angle Additional amounts of skew can arise in gear trains as a result of the deformation of component parts and as a result of displacement in the case of overhung gears. In principle, the specified shaft position tolerances should only be utilized to the ex
25、tent that the shaft centre distance tolerances resulting therefrom are not exceeded and vice versa. or h fH (6) Alteration of the effective flank line angular deviation fH by virtue of the influence of the shaft skew or of the shaft inclination Page 4 DIN 3964 N o te 3 : In accordance with DIN 3960,
26、 the following applies: Re shaft inclination fzh The shaft inclination is the deviation of the wheel shaft 2 from absolute parallelism to wheel shaft I in the centre plane I. In Fig. 1 it is given in plane I as the perpendicular distance fx,g to the intersection line 1- 1 of the bearing centre point
27、s of wheel shaft 2 projected in the centre plane. Re shaft skew fzp The shaft skew is the deviation of the wheel shaft 2 from absolute parallelism to wheel shaft 1 in the plane Il which is per- pendicular to the centre plane. In Fig. 1 it is given in plane il as the perpendicular distance fxP to the
28、 intersection line 1- 1 of the bearing centre points of wheel shaft 2 projected in plane Il. 1-1 2-2 o2 O1 I II l-Ir 2-2 21-2 Figure 1 Wheel shaft 1 Wheel shaft 2 Midpoint of wheel shaft 2 Foot of the perpendicular from O2 onto wheel shaft 1 Centre plane of wheel shafts Plane perpendicular to the ce
29、ntre plane, and parallel to 1-1 Intersection line of planes I and II Projection of 2-2 in the plane I Projection of 2-2 in the plane II Deviations from parallelism of the shaft positions Further standards DIN 3961 DIN 3962 Part 1 DIN 3962 Part 3 DIN 3963 DIN 3999 Tolerances for cylindrical gear teeth; bases Tolerances for cylindrical gear teeth; tolerances for deviations of individual parameters Tolerances for cylindrical gear teeth; tolerances for pitch-span deviations Tolerances for cylindrical gear teeth; tolerances for hobbing deviations Symbols for gear tooth systems
