1、- c c o o u D m 0 I Key I Keyway r :a L L For shaft diame ter c c a ._ e - calculated 30 33 36 37,5 39 42 45 c - E 5 hll min. max. perm. var 10 10,3 + 0.2 11,4 O 11 12 12,4 12,9 13,4 1 12 12,5 13 14 14,4 15 15.4 .- i o m 3 t! O _ 48 51 54 DEUTSCHE NORMEN September 1974 DC 621.886.6 blN 268 Tangentia
2、l Keys and Tangential Keyways for Alternating Shock Loads .- _. 16 16,4 17 17,4 Y8 18.4 I Tangentkeile und Tangentkeilnuten fr stoBartige Wechselbeanspnichungen 90 96 For connection with IS0 Draft IsO/DIS 3117-1912 published by the International Organisation for Standardization (BO), see Explanation
3、s. 30 30,4 32 32,4 -=i t2 r Dimensions in mm S P sxL5O J 75 25 78 26 84 28 2,5 max. 1 1,6 2.5 min. *I 220 240 250 2 Table continued on page 2 1 The length L is dependent upon the design in question and must be quoted. It is recommended that a length be chosen which is some 10 to 15 % greater than th
4、e length of the hub. Continued on page 2 Explanations on page 3 4: c 2% oc. I60 4:s Ed IL2r Alleinverkouf der Normen durch Beuth Verlag GmbH, Berlin 30 und Kln 1 DIN 268 engl. Preisgr.4 177 Vertr.-Nr O104 Page 2 Dm 268 I I I Keyway r min. For shaft diameter d 1 ca1;edI I min. 114 38 120 40 3 pl +23
5、50.5 I - - I pl 60,5 I 63.5 I max. 3 71 400 I I 2,5 p1 480 (5001 530 630 i St 60-2 according to DIN 17100 Other grades of steel, e.g., high-grade and fine steel, are to be specially agreed. In the case of values lying between the shaft diameters listed in the Table, it is recommended that the key th
6、ickness ti of the next smaller shaft diameter be selected. The width b is cal- culated from b - /-. For shaft diameters larger than 630 mm, tl I 0.1 , b - 0.3 d are recomaended. If no alternating shock loads occur, tangential keys according to DIN 271 are recommended. The shaft diameter 125 mm accor
7、ding to IS0 Recommendation R 775 and the proposed IC0 Bec- ommendation on tangential keys is not included in DIN 7% Part I. Application Far dimefisions d, t, t2 and b sea pages 1 and 2 The two tangential keys can also be arranged at an angle of 1800 should an angle of la0 present assembly difficulti
8、es. DIN 268 Page 3 Explanations The present Standard corresponds in subetance to the IS0 Draft ISO/DIS 3117-1973 Tangential keying Clavetage par clavettes tangentielles While it is true that this IS0 Draft deals only with tangential keys and keyways for constant loads (DIN 27l), it none the less ind
9、icates that, for alternating shock loads, tangential keys with t = 0.1 d and b = 0.3 d are recommended. As compared with the April 1924 Issue of DIN 268, the following amendments and additions should be noted: a) The shaft diameters were partly changed to conform to I80 Recommendation R 775 and al60
10、 to correspond to DIN 748 Part 1. b) While existing cross-sections of keys and keyways have been retained, changea hava in aome cases been made in the slope of the keys and in the rounding of the bottom of the keyways. c) Shaft diameters above 630 IIPI have been omitted. Should it be necessary, however, tangential kejs and keyways for larger shaft diameters can be determined from the formulae quoted. d) The contents of the Standard have been revised and supplemented, e.g., by the inclusion of an example of designation and details of materiala.
