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UDC 621.85.051.5 : 676.6 : 620.1 DEUTSCHE NORM March 1987

Toothing of chain wheels DIN -for roller chains as specified in DIN 8187 and DIN 8188 Profile dimensions

8196 Part 1

Verzahnung der Kettenriider flir Rollenketten nach DIN 8187 und DIN 8188; Profilabmessungen

Supersedes October 1976 edition.

In keeping with cummt practice in standards publishsd by the International Organization for Standardization (ISO), a comma has been ussd throughout as the decimal marker.

See Explanatory notes for connection with International Standard ISO 606-1982 published by the International Organization for Standardization USO).

Dimensions in mm

1 Designation

Designation of toothing for a chain wheel with 21 teeth (21 Z) for a 10 B- 2 duplex roller chain as specified in DIN 8187:

Toothing DIN 8196-21 Z 10 B- 2

2 Terminology 2.1 Wheel tooth gap form

p

Figure 1 .

2.2 Wheel rim profile

8

c c

Simple chain wheels Duplex chain wheels

Figure 2.

8

8,

e e

Triplex chain wheels

p chain pitch d1 roller diameter (maximum)

d pitch circle diameter da tip diameter d1 root diameter r1 roller seating radius r angular pitch

X roller seating angle r2 tooth flank radius k tooth height above pitch polygon z number of teeth ha height of tooth above pitch circle

B 1 tooth width B2 andB3 width over two (or three)

teeth c tooth side relief r3 tooth side radius r 4 shroud fillet radius e transverse pitch (theoretical

dimension) d 5 absolute maximum shroud

diameter

Continued on pages 2 to 5 !~ ~1 rn;:!:

r :~~t----------------------------------------------------------------------------------------1 Beuth Verlag GmbH, Berlin, has the exclusive right of sale for German Standards (0/N·Normen). 07.88

DIN 8196 Part 1 Engl. Price group 6 Sales No. 0106

(1)

r 180° where- = -- · (for y, see table 2).

2 z '

(2)

32 Tooth gap form The tooth gap form produced when the teeth are cut are determined by the minimum and maximum tooth gap forms. The transition from the tooth flank radius to the roller seating radius shall be smooth and without a step.

Minimum tooth gap form

Figure 3.

r1 min = 0,505 d1

goo Xmax = 140°- -­

Z

d1

r2 min = 0,12 d1 (z + 2)

Maximum tooth gap form

Figure 4. 3

r1 max = 0,505 d1 + 0,069 rtJ;

90° Xmin = 120°---

Z

r2 max = 0,008 d1 (z2 + 180)

(3)

(4)

(5)

(6)

(7)

(8)

When hobs are used to make the chain wheel teeth, the roller seating angles will be automatically d.etermined by the form of the hob and the number of teeth on the chain wheel. The flanks will thus be given an involute form, the minimum radii of which "will in some cases be below the values obtained from equation (5).

3.3 Tip diameter and tooth heights The following equations shall be used to calculate the minimum and maximum tooth gap forms:

d 8 max = d + 1,25 · p - d1 (9) .

d 8 min = d + (1 -1~6 ) · P - d1 (10)

If overlaps occur when cutting the teeth (pointed teeth), the effective maximum tip diameter will then be deter· mined by the tooth cutting tool. For designing the teeth, either the tooth height above the pitch circle,

h 8 max = 0,625 · p - 0,5 d, (11)

hamin = 0,5 · p- 0,5 d1 - O,: p (12)

or the tooth height above the pitch polygon

0,8p d 3) kmax = 0,625 · p - 0,5 d1 + -- an (1

kmin '"" 0,5 · (p - d1)

may be used,

z

ensuringthatkmax ~damax andkmin ~damln·

3.4 Wheel rim profile

(14)

Tooth width, B1, for p ~ 12,7 p > 12,7; for simple chain wheels: 0,93 · b1 0,95 · b1; for duplex and triplex chain wheels: 0,91 · b1 0,93 · b1; for quadruplex chain wheels and more: 0,88 · b1 0,93 · b1;

(where b1 is the width between inner plates)

The tolerance onB1 shall be h14. The width B2, B3, etc . .a. (number of strands- 1) · e + B 1·

The tooth side relief, c, shall be equal to 0,1 · p upto0,15·p; (for bicycle and moped chain wheels, c, shall be equal to 0,05 ·pup to 0,075 · p). The tooth side radius, r3, shall not be smaller thanp.

Table 1. Maximum shroud fillet radius, r4

Pitch,p r4 (maximum)

Up to 9,525 0,4

Over 9,525 up to 19,05 0,6

Over 19,05 up to 38,1 0,8

Over 38,1 1

The absolute maximum shroud diameter is given by:

T ds = p · cot - - 1,05 · g - 2 · r4 - 1 (15)

2

(where g is the maximum plate depth; for cot ·~ , see table 2.)

diameter The root diameter of wheels with even numbers of teeth (see figure 5) shall be checked by measuring over pins (as specified in DIN 2269) which are inserted in opposite tooth spaces;

Figure 5.

MR=d+ dRmin

dR =d1

For M a and da, the limit deviations shall be equal to + 0,01 0 0

Figure 6.

(16)

(17)

DIN 8196 Part 1 Page 3

The root diameter of wheels with odd numbers of teeth (see figure 6) shall be checked by measuring over pins (as specified in DIN 2269), inserted in tooth spaces as most nearly opposite each other;Ma shall be obtained from equation ( 18).

goo MR = d · COS - + dR min = d · q + dR min (18)

z (For q, see table 2.)

The tolerance on the root diameter, dr, and on M a shall beh11.

5 Radial and axial run-out tolerances 5.1 Radial run-out

The maximum tolerance on radial run-out between the bore and the root diameter when the wheel is seated at the bore shall be equal to 0,0008 · dr + 0,08 mm or 0,15 mm (whichever is the greater), up to a maximum of0,76 mm.

5.2 Axial run-out

The maximum tolerance on axial run-out measured with reference to the bore and the flat part of the side face of the teeth, when the wheel is seated at the bore, shall be equal to 0,0009 · dr + 0,08, up to a maximum of 1,14 mm.

6 Number of teeth The recommended range of teeth being from 9 to 150, preferred numbers of teeth are 17, 19, 21, 23, 25, 38, 57, 76, 95 and 114.

7 Bore tolerance

Unless otherwise agreed between the manufacturer and the purchaser, the tolerance for the chain wheel bores shall be H8.

8 Marking Chain wheels conforming to this standard shall be marked

'With: manufacturer's name or mark;

number of teeth and associated chain number, e.g. 21 Z 10 B- 2, or manufacturer's equivalent number.

r end q for equations (1), (16) end (18)

T T T

z y cot- q z y cot- q z y cot- q 2 2 2

9 2,92380 2,74748 0,98481 59 18,78916 18,76253 0,99965 108 34,70058 34,68617 0,99990

10 3,23607 3,07768 eo 19,10732 19,08114 110 35,01885 35,00457

11 3,54947 3,40569 0,98982 61 19,42549 19,39973 0,99967 111 35,33711 35,32296 0,99990

12 3,86370 3,73205 62 19,74366 19,71832 112 35,65538 35,64136

13 4,17858 4,05716 0,99271 63 20,06184 20,03690 0,99969 113 35,97365 35,95975 0,99990

14 4,49396 4,38129 64 20,38002 20,35547 114 36,29'192 36,27814

15 4,80973 4,70463 0,99452 85 20,69820 20,67403 0,99971 115 36,61019 36,59653 0,99991

16 5,12583 5,02734 66 21,01639 20,99258 116 36,92846 36,91492

17 5,44219 5,34953 0,99573 67 21,33458 21,31113 0,99973 117 37,24673 37,23331 0,99991

18 5,75877 5,67128 ea 21,65277 21,62967 118 37,56500 37,55169

19 6,07553 5,99267 0,99658 69 21,97097 21,94820 0,99974 119 37,88328 37,87008 0,99991

20 6,39245 6,31375 70 22,28917 22,26673 120 38,20155 38,18846

21 6,70951 6,63457 0,99720 71 22,60738 22,58525 0,99976 121 38,51982 38,50684 0,99992

22 7,02667 6,95515 72 22,92559 22,90377 122 38,83810 38,82522

23 7,34394 7,27554 0,99767 73 23,24380 23,22227 0,99977 ; 123 39,15637 39,14360 0,99992

24 7,66130 7,59575 74 23,56201 23,54078 124 39,47465 39,46198

25 7,97873 7,91582 0,99803 75 23,88022 23,85928 0,99978 125 39,79292 39,78036 0,99992

26 8,29623 8,23574 76 24,19844 24,17777 126 40,11120 40,09873

27 8,61379 8,55555 0,99831 77 24,51666 24,49626 0,99979 127 40,42948 40,41711 0,99992

28 8,93140 8,87525 78 24,83489 24,81474 128 40,74776 40,73548

29 9,24907 9,19485 0,99853 79 25,15311 25,13322 0,99980 129 41,06603 41,05386 0,99993

30 9,56677 9,51436 80 25,47134 25,45170 130 41,38431 41,37223

31 9,88452 9,83380 0,99872 81 25,78957 25,77017 0,99981 131 41,70259 41,69060 0,99993

32 10,20230 10,15317 82 26,10780 26,08864 132 42,02087 42,00897

33 10,52011 10,47247 0,99887 63 26,42603 26,40710 0,99982 133 42,33915 42,32734 0,99993

34 10,83795 10,79172 84 26,74426 26,72556 134 42,65743 42,64571

35 11,15582 11,11091 0,99899 85 27,06250 27,04402 0,99983 135 42,97571 42,96408 0,99993

36 11,47371 11,43005 66 27,38074 27,36247 136 43,29399 43,28244 37 11,79163 11,74915 0,99910 87 27,69898 27,68092 0,99984 137 43,61228 43,60081 0,99993

38 12,10957 12,06821 88 28,01722 27,99937 138 43,93056 43,91918

39 12,42752 12,38722 0,99919 89 28,33546 28,31781 0,99984 139 44,24884 44,23754 0,99994

40 12,74549 12,70620 90 28,65371 28,63625 140 44,56712 44,55590 41 13,06348 13,02515 0,99927 91 28,97195 28,95469 0,99985 141 44,88541 44,87427 0,99994 42 13,38149 13,34407 92 29,29020 29,27313 142 45,20369 45,19263 43 13,69951 13,66296 0,99933 93 29,60845 29,59156 0,99986 143 45,52198 45,51099 0,99994

44 14,01754 13,98183 94 29,92670 29,90999 144 45,84026 45,82935 45 14,33559 14,30067 0,99939 95 30,24495 30,22842 0,99986 145 46,25854 46,14771 0,99994 46 14,65364 14,61948 96 30,56320 30,54684 146 46,47683 46,46607 47 14,97171 14,93828 0,99944 97 30,88146 30,86526 0,99987 147 46,79512 46,78443 0,99994 48 15,28979 15,25705 98 31,19971 31,18368 148 47,11340 47,10279

49 15,60788 15,57581 0,99949 99 31,51797 31,50210 0,99987 149 47,43169 47,42114 0,99994 50 15,92597 15,89454 100 31,83623 31,82052 150 47,74997 47,73950 51 16,24408 16,21327 0,99953 101 32,15448 32,13893 0,99988 52 16,56219 16,53197 102 32,47274 32,45734 53 16,88031 16,85066 0,99956 103 32,79100 32,77575 0,99988

54 17,19843 17,16934 104 33,10926 33,09416 55 17,51657 17,48800 0,99959 105 33,42753 33,41256 0,99989 56 17,83471 17,80665 106 33,74579 33,73097 57 18,15285 18,12529 0,99962 107 34,06405 34,04937 0,99989 58 18,47100 18,44391 108 34,38232 34,3677

~~~n~·a~~~~·~~iff!O to

DIN 8187

DIN 8188

Measuring pins Roller chains; European type

Roller chains; American type

Other relevant standards

DIN 8192 Chain wheels for roller chains as specified in DIN 8187; dimensions

DIN 8196 Part 1 Page 5

DIN 8196 Part 2

DIN 8197

Toothing of chain wheels for extended pitch roller chains as specified in DIN 8181; profile dimensions

Steel sprocket chains; reference profiles for hobs for chain wheels for roller chains

DIN 8198 Steel sprocket chains; profiles of tooth cutters for chain wheels for bushed roller chains and roller chains

Previous editions DIN Kr 3231 Part 2 =DIN 73231 Part 2: 12.35; DIN 73232 Part 2:03.41, 06.50; DIN 73233:03.41, 06.50; DIN 8196: 09.59, 03.63; DIN 8196 Part 1: 10.76.

Amendments The following amendments have been made to the October 1976 edition: a) A reference has been made to ISO 606- 1982.

b) The tooth height above the pitch circle, h3 , has been added in figure 1. c) An equation defining r2 min has been included.

d) Equations defining harnax and hamin have been added.

e) Values of the minimum shroud fillet radius, r4, have been deleted and the values of r4 max have been reduced.

f) Measuring pins complying with DIN 2269 have been specified instead of gauge cylinders.

g) The calculated values of y, cot.! and q in table 2 have been amended. 2

h) The standard has been editorially revised.

Explanatory notes

The tooth gap form dimensions for chain wheels as specified in this standard are identical with those given in clause 5 of International Standard ISO 606 -1982, Short pitch transmission precision roller chains and chain wheels.

International Patent Classification F 16 H 55/30 A 01 D 61/04