1、BRITISH STANDARD BS 5686:1986 ISO 14-1982 Specification for Straight-sided splines for cylindrical shafts: metric nominal dimensions, tolerances and gauging requirements ISO title: Straight-sided splines for cylindrical shafts with internal centering Dimensions, tolerances and verification UDC 621.8
2、24.43BS5686:1986 This British Standard, having been prepared under the directionof the Machinery and Components Standards Committee, was published under the authority of the Board of BSI and comes intoeffect on 29 August1986 BSI 03-1999 First published December 1979 First revision August 1986 The fo
3、llowing BSI references relate to the work on this standard: Committee reference MCE/2 Draft for comment 80/75958 DC ISBN 0 580 15291 X Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Machinery and Components Standards Committee (MCE/-) t
4、o Technical Committee MCE/2, upon which the following bodies were represented: British Gear Manufacturers Association British Pump Manufacturers Association Department of Trade and Industry (National Engineering Laboratory) Institution of Engineers and Shipbuilders in Scotland Institution of Product
5、ion Engineers Lloyds Register of Shipping Milling Cutter Association The following bodies were also represented in the drafting of the standard, through subcommittees and panels: Agricultural Engineers Association Association of Hydraulic Equipment Manufacturers British Engine Group of the Society o
6、f Motor Manufacturers and Traders Limited Gauge and Tool Makers Association Institution of Engineering Designers Ministry of Defence Society of British Aerospace Companies Limited Society of Motor Manufacturers and Traders limited Amendments issued since publication Amd. No. Date of issue CommentsBS
7、5686:1986 BSI 03-1999 i Contents Page Committees responsible Inside front cover National foreword ii 1 Scope and field of application 1 2 Dimensions 1 3 Designation 1 4 Tolerances on holes and shafts 2 5 Gauging 2 6 Definitions of gauges 4 Figure Active length and engagement length 4 Table 1 Nominal
8、 dimensions 1 Table 2 Tolerances on holes and shafts 2 Table 3 Tolerances on symmetry 2 Table 4 Diameter for fitting Minor diameter 7 Table 5 Diameter not ensuring fitting Major diameter 9 Table 6 Width of splines Sliding, close sliding or fixed type mounting 11 Table 7 Measuring part of GO gauges M
9、inimum length 13 Table 8 Measuring part of NOT GO segmental gauges Recommended length 13 Publications referred to Inside back coverBS5686:1986 ii BSI 03-1999 National foreword This British Standard has been prepared under the direction of the Machinery and Components Standards Committee. It is ident
10、ical with ISO14-1982 “Straight-sided splines for cylindrical shafts with internal centering Dimensions, tolerances and verification”, which was prepared by Technical Committee ISO/TC32 of the International Organization for Standardization (ISO) and in the development of which the United Kingdom play
11、ed an active part. This edition of BS5686 supersedes the1979 edition, which is withdrawn. For the first time, BS5686 includes tolerances and gauging requirements for straight-sided splines. Terminology and conventions. The text of the international standard has been approved as suitable for publicat
12、ion as a British Standard without deviation. Some terminology and certain conventions are not identical with those used in British Standards; attention is drawn especially to the following. The comma has been used as a decimal marker. In British Standards it is current practice to use a full point o
13、n the baseline as the decimal marker. Wherever the words “International Standard” appear, referring to this standard, they should be read as “British Standard”. Cross-references. The Technical Committee has reviewed the provisions of ISO/R1938 and ISO3670, to which reference is made in the text, and
14、 has decided that they are acceptable for use in conjunction with this standard. NOTETypographical error. In the title of clause 4, delete “shaft” and substitute “shafts”. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are respon
15、sible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages1 to 14, an inside back cover and a back cover. This standard has bee
16、n updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on theinside front cover.BS5686:1986 BSI 03-1999 1 1 Scope and field of application This International Standard lays down dimensions, in millimetres, of straight-sided splines for c
17、ylindrical shafts with internal centering, light series and medium series. This International Standard also specifies control methods and corresponding gauges. 2 Dimensions The nominal dimensions common to shaft and hub, d, D and B are given in Table 1. The tolerances are indicated in Table 2 and Ta
18、ble 3. 3 Designation The profile of a splined shaft or hub shall be designated by stating, in the following order: the number of splines N, the minor diameter d and the outside diameter D, these three numbers being separated by the sign ; for example: Shaft (or hub) 6 23 26 Table 1 Nominal dimension
19、s d mm Light series Medium series Designation N D mm B mm Designation N D mm B mm 11 13 16 18 6 11 14 6 13 16 6 16 20 6 18 22 6 6 6 6 14 16 20 22 3 3,5 4 5 21 23 26 28 6 23 26 6 26 30 6 28 32 6 6 6 26 30 32 6 6 7 6 21 25 6 23 28 6 26 32 6 28 34 6 6 6 6 25 28 32 34 5 6 6 7 32 36 42 46 8 32 36 8 36 40
20、 8 42 46 8 46 50 8 8 8 8 36 40 46 50 6 7 8 9 8 32 38 8 36 42 8 42 48 8 46 54 8 8 8 8 38 42 48 54 6 7 8 9 52 56 62 8 52 58 8 56 62 8 62 68 8 8 8 58 62 68 10 10 12 8 52 60 8 56 65 8 62 72 8 8 8 60 65 72 10 10 12 72 82 92 10 72 78 10 82 88 10 92 98 10 10 10 78 88 98 12 12 14 10 72 82 10 82 92 10 92 102
21、 10 10 10 82 92 102 12 12 14 102 112 10 102 108 10 112 120 10 10 108 120 16 18 10 102 112 10 112 125 10 10 112 125 16 18BS5686:1986 2 BSI 03-1999 4 Tolerances on holes and shaft Table 2 Tolerances on holes and shafts Table 3 Tolerances on symmetry The dimensional tolerances on holes and shafts are g
22、iven in Table 2, whilst Table 3 indicates tolerances on symmetry. With certain milling cutters, it is possible for special applications to produce splines without bottom tool clearance with a very reduced fillet radius between the spline side and the minor diameter d (for example, milling cutters wi
23、th fixed working positions). The tolerances in Table 2 above relate to entirely finished workpieces (shafts and hubs). Tooling should therefore be different for untreated workpieces or workpieces treated before machining and for workpieces treated after machining. The tolerance specified on B includ
24、es the index variation (and the symmetry variation). For alignment errors, see5.7. 5 Gauging 5.1 General This clause gives general information concerning gauges and gauge control; all the other requirements concerning gauges are given in clause6 for the case where limit gauges are used, which is not
25、 compulsory. Direct measurement gauging can be permitted by previous agreement between the parties concerned according to rules to be defined to the best of requirements. 5.2 Reference temperature The standard reference temperature of industrial measurements is20C. The dimensions prescribed for part
26、s and gauges are measured at this temperature and shall normally be checked at this temperature. Tolerances on hole Tolerances on shaft Mounting type Not treated after broaching Treated after broaching B D d B D d B D d H9 H10 H7 H11 H10 H7 d10 a11 f7 Sliding f9 a11 g7 Close sliding h10 a11 h7 Fixed
27、 Dimensions in millimetres Spline width B 3 3,5 4 5 6 7 8 9 10 12 14 16 18 Tolerance of symmetry t 0,010 (IT7) 0,012 (IT7) 0,015 (IT7) 0,018 (IT7)BS5686:1986 BSI 03-1999 3 If measurements are carried out at a different temperature, the result shall be corrected taking account of the linear expansion
28、 coefficients of workpieces and gauges respectively. Unless otherwise specified, measurements are understood with reference to a zero measuring force. If measurements are carried out with a measuring force differing from zero, the results shall be corrected consequently. Correction however is not re
29、quired for comparative measurements carried out using the same means of comparison and the same measuring force between similar elements of the same material and surface finish. 5.3 Conditions of application A workpiece is conventionally acknowledged good when its splines are found satisfactory usin
30、g gauges according to the requirements of clauses5 and6 of this International Standard which are authoritative for gauging. Consequently, if the customer uses his own gauges for acceptance purposes, they shall be close enough to the external limits prescribed not to reject splines already accepted b
31、y the manufacturers gauges. In the case of dispute, both the manufacturer and customer should make their gauges available to each other for checking at their respective sites. In the event of continuing dispute the gauges shall be referred to a recognized calibration authority. 5.4 Shaft gauging 5.4
32、.1 GO side Shaft gauging on the GO side is carried out using a spline GO ring gauge simultaneously checking those characteristics relating to: 5.4.1.1 fitting, i.e.: spline minor diameter. 5.4.1.2 mounting, i.e.: spline major diameter; spline thickness; major and minor diameter concentricity; spline
33、 angular position; spline position and orientation with respect to the axis. 1) 5.4.2 NOT GO side Shaft gauging on the NOT GO side is carried out using segmental NOT GO gauges checking each element separately, i.e.: for spline major diameters: a calliper gauge or a plain ring gauge; for spline minor
34、 diameters: a calliper gauge (with appropriate special anvils, if necessary); for spline thicknesses: a calliper gauge (of appropriate external shape if necessary). 5.5 Hole gauging 5.5.1 GO side Hole gauging on the GO side is carried out using a spline GO plug gauge simultaneously checking those ch
35、aracteristics relating to: 5.5.1.1 fitting, i.e: spline minor diameter. 5.5.1.2 mounting, i.e: spline major diameter; spline space width; major and minor diameter concentricity; spline angular position; spline position and orientation with respect to the axis. 1) 5.5.2 NOT GO side Hole gauging on th
36、e NOT GO side is carried out using NOT GO segmental gauges checking each element separately, i.e.: for spline minor diameters: a cylindrical plain plug gauge; for spline major diameters: a cylindrical plate gauge with appropriate measuring faces; for spline space widths: a plate gauge. 5.6 Additiona
37、l gauging Workpiece (hole or shaft) gauging on the GO side by means of spline (plug or ring) gauges does not make it possible, if a workpiece is rejected by the gauge, to determine which element of the workpiece has provoked rejection. In case such indications are required, they may be obtained by a
38、dditional gauging (to be prescribed explicitly) using segmental gauges controlling each element separately on the GO side. 5.7 Influence of active length and engagement length Length of engagement g * : The axial length of contact between mating splines. Active length g w : The maximum axial length
39、in contact (when working) with the mating spline. For sliding splines, the active length exceeds the length of engagement. 1) Spline position and orientation with respect to the axis need be verified only where gauges are lacking.BS5686:1986 4 BSI 03-1999 As gauges are generally smaller than gauged
40、workpieces, the active length and length of engagement can influence the maximum permissible errors of alignment of splines (errors of parallelism of splines with respect to the axis). If the active length is equal to the length of engagement, spline alignment errors will in general and unless other
41、wise specified be included in dimensional tolerances and checked simultaneously. If the active length is longer than the length of engagement, it might be necessary to prescribe spline alignment errors independent of dimensional tolerances; such tolerances may then be checked separately, for example
42、, by direct measurement. If spline alignment tolerances are to be prescribed, it shall be considered that they must generally be all the smaller as the active length is longer. 5.8 Conditions of use of gauges 5.8.1 GO side GO gauges (spline ring or plug gauge) shall slide without clearance over the
43、whole length of the gauged workpiece under their own weight or in accordance with a fixed working load, gauging being carried out at three angular positions at least, evenly distributed over the surface. The gauge may be moved slightly to and fro in order to minimise the effects of friction. 5.8.2 N
44、OT GO side NOT GO segmental gauges are used in the same way as gauges intended for plain workpiece checking. Gauging is carried out at all angular positions. 5.9 Gauge control 5.9.1 GO side GO gauges are normally controlled by direct measurement. 5.9.2 NOT GO side NOT GO segmental gauges are control
45、led under the same conditions as gauges for plain workpiece gauging. 6 Definitions of gauges 6.1 General This clause defines the positions and values of tolerances for GO and NOT GO gauges and their permissible wear limits on the GO side. It also specifies the length of gauge measuring parts. The ge
46、neral indications concerning gauges and gauge control are given in clause5. NOTE 1When gauges are manufactured at the maximum material limit, they shall not present form errors outside permitted tolerances. NOTE 2To limit the number of gauges, only one GO spline plug gauge is provided to check the m
47、inimum limits of hub dimensions (whether treated or not after broaching). NOTE 3In the following texts, the phrase zero gauge line has been used to designate the theoretical line from which GO gauges are positioned in analogy with the zero assembly line (nominal dimension). The position of the “zero
48、 gauge line” has been determined as a function of workpiece limits at the maximum material condition, in order to satisfy assembly and operation requirements taking account of the fact that GO gauges are not segmental gauges but full form gauges. The “zero gauge line” is in some cases coincident wit
49、h the zero assembly line (or nominal dimension of assembly). NOTE 4In conformity with clause4, the minor diameter serves for workpiece fitting. This diameter has therefore been taken as reference for the control of geometrical defects on other elements (i.e.the other diameter of width B of splines). Figure Active length and engagement lengthBS5686:1986
