1、BRITISH STANDARD CONFIRMED FEBRUARY 1986 BS 4582-2: 1978 Specification for Fine pitch gears (metricmodule) Part 2: Hobs and cutters UDC 621.833:621.914.6BS4582-2:1978 This British Standard, having been prepared under the directionof the Mechanical Engineering Standards Committee, was published under
2、the authority of theExecutive Board on 31October1978 BSI 11-1999 The following BSI references relate to the work on this standard: Committee reference MEE/127 and MEE/17 Draft for comment 76/72738 DC ISBN 0 580 09809 5 Cooperating organizations The Mechanical Engineering Standards Committee, under w
3、hose direction this British Standard was prepared, consists of representatives from the following Government departments and scientific and industrial organizations: The organizations marked with an asterisk in the above list, together with the following, were directly represented on the committee e
4、ntrusted with the preparation of this British Standard: Associated Offices Technical Committee Department of Trade (Marine Division) Association of Consulting Engineers Department of Transport Association of Hydraulic Equipment Electricity Supply Industry in England and Manufacturers Wales Associati
5、on of Mining Electrical and Engineering Equipment Users Association Mechanical Engineers Federation of Manufacturers of Construction British Compressed Air Society Equipment and Cranes British Electrical and Allied Manufacturers Health and Safety Executive Association (BEAMA) Institution of Gas Engi
6、neers British Gas Corporation Institution of Mechanical Engineers British Gear Manufacturers Association* Institution of Production Engineers* British Internal Combustion Engine Research London Transport Executive Institute Limited Machine Tool Industry, Research Association British Pump Manufacture
7、rs Association Ministry of Defence* British Steel Corporation National Coal Board British Steel Industry Process Plant Association Chartered Institution of Building Services Railway Industry Association of Great Britain Crown Agents for Oversea Governments and Society of Motor Manufacturers and Admi
8、nistrations Traders Limited Department of Industry, Mechanical Telecommunication Engineering b) quantity of hobs required; c) normal module; d) grade of accuracy of cutter; e) hand (right or left) 1) ; f) tooth form; g) diameter and length and bore if different from that given inTable 1; Example One
9、 off: 0.8module, gradeA hob to BS4582-2, right-hand. h) type of drive. a) Normal module x m n b) Normal pressure angle at reference cylinder x n c) Tooth lead angle xx d) Cutting depth x mmCD e) Grade of accuracy of cutter A, B or C as appropriate f) Gash lead (if-gash is helical) x mm GL g) Right-h
10、and or left-hand R or L h) Single start SS i) Number and year of this British Standard BS4582-2:1978 j) Topping or non-topping t or N k) Involute Inv l) Cycloidal Cy m) Double circular arc Circ arc 1) Unless otherwise specified by the purchaser, the hobs supplied in accordance with this standard wil
11、l be right-hand.BS4582-2:1978 BSI 11-1999 3 Figure 1 Hob termsBS4582-2:1978 4 BSI 11-1999 NOTEFor internal gears the addendum is0.850 instead of1.000. All dimensions are in millimetres. Figure 2 Basic gear rack profiles NOTEThe angular relationship between the keyway and hob teeth is not important.
12、Figure 3 Gear hob with axial keywayBS4582-2:1978 BSI 11-1999 5 Table 1 Dimensions of gear hobs for fine pitch gears for preferred ametric modules (seeFigure 3) All dimensions are in millimetres. 1 2 3 4 5 6 7 Module Outside diameter Overall length Bore Approx. bearing length b Boss Diameter c Length
13、 d m n D l 1 d l 3 D 1 l 2min. 0.08 40 34 19.050 1/3 of overall length for all modules 27 2.5 for all modules 32 22 10 20 24 16max. 8 16 0.1 40 34 19.050 27 32 22 10 20 24 16max. 8 16 0.12 40 34 19.050 27 32 22 10 20 24 16max. 8 16 0.16 40 34 19.050 27 32 22 10 20 24 16max. 8 16 0.2 40 34 19.050 27
14、40 34 13 27 32 22 10 20 24 16max. 8 16 0.25 40 34 19.050 27 40 34 13 27 32 22 10 20 24 16max. 8 16 0.3 40 34 19.050 27 40 34 13 27 32 22 10 20 24 16max. 8 16 0.4 40 34 19.050 27 40 34 13 27 32 22 10 20 24 16max. 8 16 0.5 48 34 19.050 35 40 34 13 27 32 22 10 20 24 16max. 8 16 0.6 48 34 19.050 35 40 3
15、4 13 27 32 22 10 20 24 16max. 8 16 0.7 48 34 19.050 35 48 34 16 35 40 34 13 27 32 22 10 20 24 16max. 8 16BS4582-2:1978 6 BSI 11-1999 Table 1 Dimensions of gear hobs for fine pitch gears for preferred ametric modules (seeFigure 3) All dimensions are in millimetres. 1 2 3 4 5 6 7 Module Outside diamet
16、er Overall length Bore Approx. bearing length b Boss Diameter c Length d m n D l 1 d l 3 D 1 l 2min. 0.8 48 34 19.050 35 48 34 16 35 40 34 13 27 32 22 10 20 24 16max. 8 16 0.9 48 34 19.050 35 48 34 16 35 40 34 13 27 32 22 10 20 1.0 48 34 19.050 35 48 34 16 35 40 34 13 27 32 22 10 20 a For dimensions
17、 of non-preferred module hobs, the dimensions recommended for use are those of the next larger preferred module hob. b Hob bores may be unrecessed or have more than one recess in the bore. In such cases, the bearing lengths quoted do not apply. c The boss periphery may be used as a datum surface sub
18、ject to its permissible run-out. d The overall length of the boss may be increased as required should tenon drive be specified (see4.8). Although dimensions for the boss diameter are given, this feature should be as large as possible. Bosses need not be provided on gradesB andC hobs and in such case
19、s the length of the hob may be reduced by twice the boss length. For gradeA hobs, single or double bosses may be provided depending upon the purchasers requirements. Figure 4 Keyway in hobBS4582-2:1978 BSI 11-1999 7 Table 2 Dimensions of keyway in hob (seeFigure 4) Table 3 Tolerances for parallel ar
20、bor diameters and dimensions of key in arbor (seeFigure 5) All dimensions are in millimetres. 1 2 3 4 5 6 7 Nominal bore Width of keyway Diameter of bore plus depth of keyway Corner radius d a b c r nom. tol. C11 nom. tolerance max. tolerance 8 No keyway provided 10 13 3 14.6 0.4 16 4 17.7 0.6 19.05
21、0 3.175 b 20.9 + 0.36 a 0 0.8 b a Bore tolerances are given inTable 4. b These dimensions are based on established UK practice and therefore are not taken from ISO240 (seeforeword). Figure 5 Key for arbor All dimensions are in millimetres. 1 2 3 4 5 6 7 8 9 Nominal diameter of arbor Nominal size of
22、key Width of key Dimension over arbor and key Depth of key Edge chamfer d b 1 c 1 h 1 s 45 nom. tol. h4 nom. tol. h9 nom. tol. nom. tol. h9 nom. tol. 8 No keyway provided 10 13 3 3 14.2 3 0.16 16 4 4 17.2 4 0.25 19.050 3.175 a 3.175 a 20.6 a 3.175 a 0.8 a a These dimensions are based on established UK practice and therefore are not taken from ISO240 (seeforeword). +0.145 +0.070 +0.10 +0 0.1 +0.10 +0 0.2 +0.145 +0.070 +0 0.30 +0.004 0 +0.005 0 +0.030 0 +0.1 0 +0.030 0.09 +0 0.15 +0 0 +0.006 0 +0.030 0 +0.1 0 +0.030 0.15 +0
