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1、BRITISH STANDARD BS 6107-1: 1981 ISO 1132:1980 Rolling bearings: tolerances Part 1: Glossary of terms ISO title: Rolling bearings Tolerances Definitions UDC 621.822.6:621.753.1:001.4 BS 6107-1:1981 This British Standard, having been prepared under the direction of the Mechanical Engineering Standard
2、s Committee, was published under the authority of the Executive Board and comes into effect on 30 April 1981 BSI 10-1999 The following BSI references relate to the work on this standard: Committee reference MEE/30 Draft for comment 79/77401 DC ISBN 0 580 12095 3 Cooperating organizations The Mechani
3、cal Engineering Standards Committee, under whose direction this British Standard was prepared, consists of representatives from the following: Associated Offices Technical CommitteeDepartment of Trade (Marine Division) Association of Consulting EngineersDepartment of Transport Association of Hydraul
4、ic EquipmentElectricity Supply Industry in England and ManufacturersWales Association of Mining Electrical andEngineering Equipment Users Association* Mechanical EngineersFederation of Manufacturers of Construction British Compressed Air SocietyEquipment and Cranes British Electrical and Allied Manu
5、facturersHealth and Safety Executive Association (BEAMA)Institution of Gas Engineers British Gas CorporationInstitution of Mechanical Engineers* British Gear Manufacturers AssociationInstitution of Plant Engineers British Internal Combustion EngineInstitution of Production Engineers* Manufacturers A
6、ssociationLloyds Register of Shipping British Pump Manufacturers AssociationLondon Transport Executive British Steel CorporationMachine Tool Industry Research Association* British Steel IndustryMinistry of Defence* British Valve Manufacturers Association Ltd.National Coal Board* CbmpeOil Companies M
7、aterials Association Chartered Institution of Building ServicesProcess Plant Association Crown Agents for Oversea Governments andRailways Industry Association of Great AdministrationsBritain Department of IndustrySociety of Motor Manufacturers and Traders (Mechanical Engineering)Limited Department o
8、f Industry (National EngineeringTelecommunication Engineering and Laboratory)Manufacturing Association (TEMA) Department of the Environment (PSA)Water-tube Boilermakers Association The organizations marked with an asterisk in the above list, together with the following, were directly represented on
9、the Technical Committee entrusted with the preparation of this British Standard: Ball and Roller Bearing ManufacturersSociety of British Aerospace Companies AssociationLimited North East Coast Institution of Engineers and Shipbuilders Amendments issued since publication Amd. No.Date of issueComments
10、 BS 6107-1:1981 BSI 10-1999i Contents Page Cooperating organizationsInside front cover National forewordii 1Scope and field of application1 2General conditions1 3Axes, directions, planes1 4Boundary dimensions1 4.1Bore diameter1 4.2Outside diameter2 4.3Form2 4.4Width and height2 4.5Ring chamfer dimen
11、sion3 5Running accuracy3 5.1Radial runout3 5.2Face runout with raceway3 5.3Face runout with bore4 5.4Raceway parallelism with face4 5.5Outside surface inclination4 5.6Thickness variation4 6Internal clearance4 6.1Radial clearance4 6.2Axial clearance4 BS 6107-1:1981 ii BSI 10-1999 National foreword Th
12、is Part of this British Standard has been prepared under the direction of the Mechanical Engineering Standards Committee and forms part of a series implementing corresponding International Standards in the development of which the United Kingdom has played an active part. This Part of BS 6107 is ide
13、ntical with the English text of ISO 1132:1980 (E/F) “Rolling bearings Tolerances Definitions” prepared by Technical Committee ISO/TC 4, Rolling bearings, of the International Organization for Standardization (ISO). Further Parts of this standard will implement ISO 4921) “Rolling bearings Radial bear
14、ings Tolerances” and ISO 57531) “Rolling bearings Radial internal clearance”. Terminology and conventions. The English text of the International Standard has been approved as suitable for publication as a British Standard without deviation. Some terminology and certain conventions are not identical
15、with those used in British Standards; attention is especially drawn to the following. Wherever the words “International Standard(s)” appear, referring to this standard, they should be read as “British Standard(s)”. A British Standard does not purport to include all the necessary provisions of a cont
16、ract. Users of British Standards are responsible 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, pages 1 to 4 and a back cover.
17、This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. 1) In course of preparation; at present ISO/DIS 492 and ISO/DIS 5753. BS 6107-1:1981 BSI 10-19991 1 Scope and field of application Th
18、is International Standard defines terms used in International Standards specifying tolerances for boundary dimensions, running accuracy and internal clearance for rolling bearings. In addition, it specifies general conditions under which these tolerances apply and gives symbols for a number of the c
19、oncepts defined. 2 General conditions At a temperature of + 20 C, and provided that the bearing parts are completely unstressed by external forces, including measuring loads and the gravitational force on the part itself, a boundary dimension of a bearing or bearing part should not deviate from the
20、nominal dimension by more than the tolerance to be applied. Only the low deviation of a bore diameter tolerance and the high deviation of an outside diameter tolerance apply to the entire width of the bore and outside surfaces of bearing rings. In other respects, the definitions in clauses 4.1, 4.2
21、and 4.3 only concern the surfaces between ring chamfers. Unless there is an indication to the contrary, the terms “ring”, “inner ring” and “outer ring” as used in this International Standard, include washer, shaft washer and housing washer, respectively. 3 Axes, directions, planes 3.1 inner ring axi
22、s: Axis of the cylinder inscribed in a basically cylindrical bore or of the cone inscribed in a basically tapered bore. 3.2 outer ring axis: Axis of the cylinder circumscribed around a basically cylindrical outside surface. 3.3 bearing axis: Identical to the inner ring axis. 3.4 reference face of a
23、ring: Face so designated by the manufacturer of the bearings and which may be the datum for measurements. 3.5 radial plane: Plane perpendicular to the bearing or ring axis. It is, however, acceptable to consider radial planes referred to in the definitions as being parallel with the plane tangential
24、 to the reference face of a ring. 3.6 radial direction: Direction through the bearing or ring axis in a radial plane. 3.7 axial plane: Plane containing the bearing or ring axis. 3.8 axial direction: Direction parallel with the bearing or ring axis. It is, however, acceptable to consider axial direct
25、ions referred to in the definitions as being perpendicular to the plane tangential to the reference face of a ring or back face of a thrust bearing washer. 3.9 middle of raceway: Point or line on a raceway surface, halfway between the two edges of the raceway. 3.10 raceway contact diameter: Diameter
26、 of the theoretical circle through the nominal points of contact between the rolling elements and the raceway. NOTEFor roller bearings, the nominal point of contact is generally at the middle of the roller. 3.11 cylinder and cone: Cylinder and cone, respectively, circular in sections perpendicular t
27、o its axis. 4 Boundary dimensions Diameter (width) variations and mean diameters (width) defined in this clause, are the differences and arithmetical means of the actual largest and smallest single dimensions, not of the permissible limits for the single dimensions. 4.1 Bore diameter 4.1.1 nominal b
28、ore diameter, d: Diameter of the cylinder containing the theoretical bore surface of a cylindrical bore. Diameter, in a designated radial plane, of the cone containing the theoretical bore surface of a tapered bore. NOTEFor rolling bearings, the nominal bore diameter is generally the reference value
29、 (basic diameter) for deviations of the actual bore surface. 4.1.2 single bore diameter, ds: Distance between two parallel tangents to the line of intersection of the actual bore surface and a radial plane. 4.1.3 deviation of a single bore diameter, ds (of a basically cylindrical bore): Difference b
30、etween a single bore diameter and the nominal bore diameter, %ds= ds d. 4.1.4 bore diameter variation, Vds (of a basically cylindrical bore): Difference between the largest and the smallest of the single bore diameters of an individual ring. 4.1.5 mean bore diameter, dm (of a basically cylindrical b
31、ore): Arithmetical mean of the largest and the smallest of the single bore diameters of an individual ring. 4.1.6 mean bore diameter deviation, dm (of a basically cylindrical bore): Difference between the mean bore diameter and the nominal bore diameter, dm= dm d. 4.1.7 single plane mean bore diamet
32、er, dmp: Arithmetical mean of the largest and the smallest of the single bore diameters in a single radial plane. BS 6107-1:1981 2 BSI 10-1999 4.1.8 single plane mean bore diameter deviation, dmp (of a basically cylindrical bore): Difference between a single plane mean bore diameter and the nominal
33、bore diameter, dmp= dmp d. 4.1.9 bore diameter variation in a single radial plane, Vdp: Difference between the largest and the smallest of the single bore diameters in a single radial plane. 4.1.10 mean bore diameter variation, Vdmp (of a basically cylindrical bore): Difference between the largest a
34、nd the smallest of the single plane mean bore diameters of an individual ring. 4.2 Outside diameter 4.2.1 nominal outside diameter, D (of a basically cylindrical outside surface): Diameter of the cylinder containing the theoretical outside surface. NOTEFor rolling bearings, the nominal outside diame
35、ter is generally the reference value (basic diameter) for deviations of the actual outside surface. 4.2.2 single outside diameter, Ds: Distance between two parallel tangents to the line of intersection of the actual outside surface and a radial plane. 4.2.3 deviation of a single outside diameter, Ds
36、 (of a basically cylindrical outside surface): Difference between a single outside diameter and the nominal outside diameter, Ds= Ds D. 4.2.4 outside diameter variation, VDs (of a basically cylindrical outside surface): Difference between the largest and the smallest of the single outside diameters
37、of an individual ring. 4.2.5 mean outside diameter, Dm (of a basically cylindrical outside surface): Arithmetical mean of the largest and the smallest of the single outside diameters of an individual ring. 4.2.6 mean outside diameter deviation, Dm (of a basically cylindrical outside surface): Differ
38、ence between the mean outside diameter and the nominal outside diameter, Dm= Dm D. 4.2.7 single plane mean outside diameter, Dmp: Arithmetical mean of the largest and the smallest of the single outside diameters in a single radial plane. 4.2.8 single plane mean outside diameter deviation, Dmp (of a
39、basically cylindrical outside surface): Difference between a single plane mean outside diameter and the nominal outside diameter, Dmp= Dmp D. 4.2.9 outside diameter variation in a single radial plane, VDp: Difference between the largest and the smallest of the single outside diameters in a single ra
40、dial plane. 4.2.10 mean outside diameter variation, VDmp (of a basically cylindrical outside surface): Difference between the largest and the smallest of the single plane mean outside diameters of an individual ring. 4.3 Form 4.3.1 deviation from circular form (of a basically circular line on a surf
41、ace): Greatest radial distance between the circle inscribed in the line (inside surface) or circumscribed around the line (outside surface) and any point on the line. 4.3.2 deviation from cylindrical form (of a basically cylindrical surface): Greatest radial distance, in any radial plane, between th
42、e cylinder inscribed in the surface (inside surface) or circumscribed around the surface (outside surface) and any point on the surface. 4.3.3 deviation from spherical form (of a basically spherical surface): Greatest radial distance, in any equatorial plane, between the sphere inscribed in the surf
43、ace (inside surface) or circumscribed around the surface (outside surface) and any point on the surface. 4.4 Width and height 4.4.1 nominal ring width, B (inner ring) or C (outer ring): Distance between the two theoretical side faces of a ring. NOTEFor rolling bearings, the nominal width is generall
44、y the reference value (basic dimension) for deviations of the actual width. 4.4.2 single ring width, Bs or Cs: Distance between the points of intersection of the two actual side faces of a ring and a straight line perpendicular to the plane tangential to the reference face of the ring. 4.4.3 deviati
45、on of a single ring width, Bs or Cs: Difference between a single ring width and the nominal ring width, Bs= Bs B and Cs= Cs C. 4.4.4 ring width variation, VBs or VCs: Difference between the largest and the smallest of the single widths of an individual ring. 4.4.5 mean ring width, Bm or Cm: Arithmet
46、ical mean of the largest and the smallest of the single width of an individual ring. 4.4.6 nominal bearing width, B, C or T (radial bearing): Distance between the two theoretical ring faces designated to bound the bearing width. NOTEThe nominal bearing width is generally the reference value (basic d
47、imension) for deviations of the actual bearing width. Symbol B is used where the nominal width is the distance between the inner ring faces, as well as where inner and outer rings are equally wide and their faces nominally flush. Symbol C is used where the nominal width is the distance between the o
48、uter ring faces (providing Symbol B is not applicable). Symbol T is used where the nominal width is the distance between one inner ring face and the outer ring face on the opposite side. BS 6107-1:1981 BSI 10-19993 4.4.7 actual bearing width, Ts (radial bearing where one inner ring face and one oute
49、r ring face are designated to bound the bearing width): Distance between the points of intersection of the bearing axis and the two planes tangential to the actual ring faces designated to bound the bearing width. NOTEFor a single-row tapered roller bearing this is the distance between the points of intersection of the bearing axis and two planes, one tangential to the actual back face of the cone and one tangential to that of the cup, the cone and cup raceways and the cone back face rib being in contact with all the rollers. 4.4.8