1、ICS 21.100.20Wlzlager Radial-Schrgkugellager Teil 6: Einreihig, Berhrungswinkel 15 und 25Ref. No. DIN 628-6 : 1999-07English price group 13 Sales No. 011312.00DEUTSCHE NORM July 1999628-6Continued on pages 2 to 18. No part of this translation may be reproduced without the prior permission ofDIN Deut
2、sches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).Translation by DIN-Sprachendienst.In case of doubt, the German-language original should be consulted as the authoritative text.Single-row, angular conta
3、ct radial ball bearingswith contact angles of 15 and 25In keeping with current practice in standards published by the International Organization for Standardization(ISO), a comma has been used throughout as the decimal marker.ForewordThis standard has been prepared by the Arbeitsausschuss Wlzlager (
4、Rolling Bearings Standards Commit-tee) and conforms in substance to ISO 12044 : 1995.All dimensions are in millimetres.1 ScopeThis standard defines concepts and specifies dimensions, tolerances, preloading forces, the rigidity anddesignation of single-row angular contact radial ball bearings with co
5、ntact angles of 15 and 25, as well asfor sets of such bearings. Angular contact ball bearings are predominantly used in machine tool spindles.This standard gives users a selection of designs based on the general plan for rolling bearings specified inDIN 616.2 Normative referencesThis standard incorp
6、orates, by dated or undated reference, provisions from other publications. Thesenormative references are cited at the appropriate places in the text, and the titles of the publications arelisted below. For dated references, subsequent amendments to or revisions of any of these publicationsapply to t
7、his standard only when incorporated in it by amendment or revision. For undated references, thelatest edition of the publication referred to applies.DIN 616 Rolling bearings General planDIN 620-2 Tolerances for radial ball bearingsDIN 620-6 Chamfer dimension limits for rolling bearingsDIN 623-1 Desi
8、gnation system for rolling bearingsDIN 17230 Steel for rolling bearings Technical delivery conditionsISO 76 : 1987 Rolling bearings Static load ratingsISO 281 : 1990 Rolling bearings Dynamic load ratings and rating lifeISO 12044 : 1995 Rolling bearings Single-row angular contact ball bearings Chamfe
9、r dimensions forouter ring non-thrust sidePage 2DIN 628-6 : 1999-073 Concepts3.1 Contact angleThe contact angle, a, is the angle between a plane perpendicular to a bearing axis and the nominal line of actionof the resultant of the forces transmitted by a bearing ring to a rolling element.3.2 Axial r
10、igidityThe axial rigidity, ca, is the ratio of the external axial load acting on a preloaded bearing set to the axial springdeflection resulting from the elastic deformation at the ball/raceway contacts.NOTE: For practical purposes, it is assumed that the rings are rigid and there is no radial widen
11、ing. Only elasticdeformation at the ball/raceway contacts due to Hertzian pressure is taken into consideration.3.3 Axial preloadThe axial preload, Fva, is the force applied to the rings of a bearing or bearing set to align them axially in orderto improve rigidity and running accuracy.NOTE 1: For pra
12、ctical purposes, it is assumed that the rings are rigid and there is no radial widening. Onlyelastic deformation at the ball/raceway contacts due to Hertzian pressure is taken into consideration.NOTE 2: The size of the preload is defined for each bearing. In practice, the prescribed load is reached
13、whenthe faces of the inner and outer rings lie in the same axial plane (with no overhang).3.4 Preload classesBearings as in this standard are classified according to the size of the preload (and thus their rigidity) into thefollowing three classes: L for light preload, M for medium preload and H for
14、 heavy preload.3.5 Universal matching bearingA bearing which, when used together with one or more similar bearings, yields predetermined characteristicsin a paired or stack set.4 Dimensions and designation4.1 GeneralThe dimensions specified here comply with series 19 dimensions (bearing series 719 C
15、 and 719 D) ) and series10 dimensions (bearing series 70 C and 70 D) as specified in DIN 616.The design shown is for illustrative purposes only, but the dimensions shall be as specified.Figure 1: Single-row angular contact radial ball bearing (notation)4.2 DesignationBearing DIN 628 TermDIN numberBe
16、aring seriesBore diameterContact angleCage materialTolerance classDesignation of bearing arrangement (or G for universal bearings)Preload class/eDedr4r2r2r2r1r1r3r1BaPage 3DIN 628-6 : 1999-074.3 Examples of designationDesignation of angular contact ball bearings of bearing series 719 (719), with a b
17、ore diameter, d, of 30 mm (06),a contact angle, a, of 15 (C; 25 = D), and a plastic cage (T), of tolerance class P4S (P4S), and of preloadclass L (L):Designation of a universal matching bearing (G):Angular contact ball bearing DIN 628 71906 CT/P4SGLDesignation of a set of two universal matching bear
18、ings (G), with no specified arrangement (D):Angular contact ball bearing DIN 628 71906 CT/P4SDGLDesignation of a set of two bearings in back-to-back arrangement (DB):Angular contact ball bearing DIN 628 71906 CT/P4SDBL4.4 Dimensions and symbolsTable 1: Dimensions and symbols1)Symbolfor a contact ang
19、le of(continued)See subclauses 6.1 and 6.2 for tolerances.Values as in ISO 12044.Page 4DIN 628-6 : 1999-075 MaterialsRolling elements and rings shall be made of steel as specified in DIN 17230. Cages shall be made of fibrereinforced plastic (type T as in DIN 623-1).6 Design6.1 TolerancesTolerances a
20、re of classes P4 and P2 as in DIN 620-2 (for dimensions DBsand DCs, the modified tolerancesapply).Tables 2 and 3 of this standard specify the values for tolerance class P4S (i.e. dimensional tolerances shall beof class P4, while for running accuracy, class P2 shall apply, both as in DIN 620-2).6.2 C
21、hamfer dimensionsChamfer boundary dimensions shall be as specified in DIN 620-6.Table 1 (concluded)1)Symbolfor a contact angle ofSee page 3 for 1) and 2).Page 5DIN 628-6 : 1999-076.3 Axial preload and rigidity6.3.1 Matched pairsTables 5 to 8 specify minimum values for the axial preload and rigidity
22、of matched pairs of bearings of the samesize and design, in either the face-to-face or back-to-back arrangement (cf. subclause 7.1.2).The values for rigidity refer to an external preload up to 2,5 times the minimum value specified for the relevantpreload class.Nominal values for use in designing spi
23、ndles are given in Appendix A.6.3.2 Matched stacksFor matched stacks consisting of three or more bearings of the same size and design and mounted in face-to-face, back-to-back or tandem arrangement (see subclauses 7.1.3 to 7.1.5), the axial preload and rigidity shallbe calculated by multiplying the
24、values given in tables 5 to 8 by the factors given in table 4. The values obtainedrefer to an external axial load acting in the direction of the maximum axial loadbearing capacity of the stack.Table 4: Multiplication factors for calculating axialpreload and axial rigidity of matched stacksTable 2: I
25、nner ring (tolerance class P4S)1)Over Up toValues shall be taken from the relevant tables in DIN 620-2.DeviationModifieddeviationUpper LowerUpper Lower Upper LowerDeviationTable 3: Outer ring (tolerance class P4S)1)Over Up toDeviationModifieddeviationUpper LowerUpper Lower Upper LowerDeviationValues
26、 shall be taken from the relevant tables in DIN 620-2.Arrangement1)Factor foraxial preload, Fvaaxial rigidity, ca6.4 Shoulder diameterThe shoulder diameter, dk, and the contact area between the mating ring faces in a tandem arrangement, A,shall be designed so that the surface pressure under axial lo
27、ad does not exceed 60 N/mm2 (see figure 2).The maximum axial load, Fa, is given by:See Appendix B for C0.See subclauses 7.1.3 to 7.1.5 for designations of arrangements.38030,a=CF.Page 6DIN 628-6 : 1999-076.5 LubricationThe inner geometry shall be such that full lubrication (using grease or greased a
28、ir) via the gap between cage andinner ring is possible (see figure 3). Values for this dimension are specified in Appendix A.Figure 3: Lubrication of bearing(dimension dT)Table 5: Axial preload, Fva,and axial rigidity, ca,for bearings of series 719 C, with a = 15Minimum values for Fvaand caforclass
29、L class M class HFigure 2: Shoulder diameter(dimension dk)edkedTedTAPage 7DIN 628-6 : 1999-07Table 6: Axial preload, Fva,and axial rigidity, ca,for bearings of series 719 D, with a = 25Minimum values for Fvaand caforclass L class M class HcacacaFvaFvaFvaPage 8DIN 628-6 : 1999-07Table 7: Axial preloa
30、d, Fva,and axial rigidity, ca,for bearings of series 70 C, with a = 15Minimum values for Fvaand caforclass L class M class HFvaFvaFvacacacaPage 9DIN 628-6 : 1999-07Table 8: Axial preload, Fva,and axial rigidity, ca,for bearings of series 70 D, with a = 25Minimum values for Fvaand caforclass L class
31、M class HFvaFvaFvacacaca6.6 Measurement of preload and rigidity6.6.1 Measuring arrangementFigures 4 and 5 show the arrangements for measuring axial preload and rigidity, respectively.6.6.2 Measuring conditionsSet up the test arrangement so that the rings do not buckle or are pressed together under t
32、he test load FPa(i.e. the rings are suitably rigid).Before testing rigidity, preload the bearing set with the defined preload. This shall be deemed to have beenreached when there is no clearance between neighbouring ring end faces.During measurement, the inner ring shall be rotated (with about ten r
33、evolutions per minute).6.6.3 Measurement procedure6.6.3.1 PreloadApply the axial load, Fpa, increasing it until the inner and outer ring end faces lie in the same plane (i.e. thereis no overhang) (cf. figure 4). The axial force required to achieve this condition corresponds to the preload ofthe bear
34、ing.6.6.3.2 RigidityAfter preloading, apply an additional load, FPa, which shall be no greater than 2,5 times the minimum of Fva(seetables 5 to 8). Then, measure the deflection, sa. Calculate the rigidity, ca, in N/m, using the following equation:ca= FPa/ sa7 Symbols for bearing arrangements7.1 Matc
35、hed sets7.1.1 GeneralAngular contact ball bearings may be arranged in several ways to form a set. Symbols for the most commonarrangements are given below, a differentiation being made between matched sets and sets of universalmatching bearings.Figure 4: Measuring preload Figure 5: Measuring rigidity
36、Page 10DIN 628-6 : 1999-07FPaFPasasaMatched sets Sets of universalmatching bearings1)7.1.2 Paired sets7.1.3 Sets of three bearings7.1.4 Sets of four bearings7.1.5 Sets of five bearings7.2 Individual universal matching bearingsWhen not provided as a set, universal matching bearings shall be designate
37、d by the letter G.1) Irrespective of arrangement2) Direction of greatest axial loadbearing capacity.Symbol: DGFigure 6: Back-to-back(O-arrangement)Symbol: DBFigure 7: Face-to-face(X-arrangement)Symbol: DFFigure 8: TandemSymbol: DTFigure 9: Tandem and back-to-back combinationSymbol: TBTFigure 10: Bac
38、k-to-backSymbol: QBCFigure 12: Tandem and back-to-backcombinationSymbol: PBCFigure 11: Tandem and back-to-backcombinationSymbol: QBTFigure 13: Tandem and back-to-backcombinationSymbol: PBTSymbol: TGSymbol: QGSymbol: PGPage 11DIN 628-6 : 1999-078 Requirements8.1 Requirements for matched sets8.1.1 Gen
39、eralStandard angular contact ball bearings are supplied in sets comprising two or more bearings. Subclause 7.1illustrates the various arrangements, along with their designations.Bearings shall be manufactured to have the required preload, and to bear the load uniformly, when mounted.8.1.2 Bore diame
40、ter and outside diameterThe bore and outside diameters shall not vary by more than one-half of the relevant specified diameter toler-ance.8.1.3 Additional markingsTo ensure that the bearings in a set can be properly arranged when the set is mounted, a suitable mark shallbe made on their outer surfac
41、e. The marking shall be used to maintain a correct arrangement when mounting.Figure 14 shows a recommended marking (a V extending across the set).Where a P4 tolerance class is specified for a bearing, the points at which the ring thickness between the racewayand outer surface (for outer rings) or be
42、tween the raceway and bore (for inner rings) is greatest shall be markedon the end faces of the rings (see figure 15).The marking indicating the bearing arrangement shall be marked on the outer ring in such a manner that thedirection of the maximum axial load which can be borne by the set is clearly
43、 defined (e.g. in the direction of thepoint of the V mark shown in figure 14). Where a P4 tolerance class is specified, this designation shall also beat the point where the outer ring thickness is greatest (see figure 15).8.2 Requirements for universal matching bearings8.2.1 GeneralUniversal matchin
44、g bearings are manufactured so that they may be assembled in any arrangement (e.g. asregards preloading and rigidity).NOTE: The specified preload and rigidity values are obtained by manufacturing the universal bearings tocertain combinations of characteristics (e.g. number of balls and size of balls
45、, hardness, overhang, etc.).This combination may vary among manufacturers.When assembling the bearing sets, care shall be taken that each bearing in a set comes from the samemanufacturer. If bearings from different manufacturers are mixed together, there is no longer any guaranteethat they will have
46、 the desired characteristics.8.2.2 Bore diameter and outside diameterAs a rule, universal bearings are bought individually and then assembled by the customer.To improve the bearings performance, the bore and outside diameters of bearings intended for the same setcan be matched before assembly, thus
47、ensuring an even more uniform load distribution. In this case, the boreand outside diameters should not vary by more than one-half of the relevant specified diameter tolerance.If universal bearings are ordered as a set, this coordination of the bore and outside diameters is performed bythe manufactu
48、rer, in which case the V mark described in subclause 8.1.3 is not necessary.Figure 15: Marking greatest ring thicknessand direction of axial load1 Greatest ring thicknessFigure 14: Marking arrangementof bearingsPage 12DIN 628-6 : 1999-078.2.3 Additional markingsTo facilitate the coordination of the
49、bore and outside diameters, mark the actual mean deviation from thenominal bore diameter, Ddm, and that from the nominal outside diameter, DDm, at a suitable place on thebearing.Where a P4 tolerance class is specified for a bearing, the points at which the ring thickness between the racewayand outer surface (for outer rings) or between the raceway and bore (for inner rings) is greatest shall be markedon the end faces of the rings (see figure 16).1 Greatest ring thicknessFigure 16: Marking universal bearings8.2.4 Ordering informationWhen order
