1、DEUTSCHE NORM Julv 1998 Plain bearings Part 6: Thermoplastic bushes I DIN I 1850-6 ICs 21.100.10 Descriptors: Plain bearings, bushes, thermoplastics. Gleitlager - Teil 6: Buchsen aus Thermoplasten Supersedes February 1979 edition. In keeping with current practice in standards published by the Intern
2、ational Organization for Standardization (ISO), a comma has been used throughout as the decimal marker. Dimensions in mm Foreword This standard has been prepared by Normenausschu Gleitlager (Plain Bearings Standards Committee). Amendments The standard has been completely revised. Previo us edit ions
3、 DIN 1850-6: 1975-08. 1979-02. 1 Scope This standard specifies dimensions and tolerances, materials, finish and test methods for press-fitted thermoset bushes used as plain bearings, with or without lubrication grooves as in IS0 121 28. 2 Normative references This standard incorporates, by dated or
4、undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text, and the titles of the publications are listed below. For dated references, subsequent amendments to or revisions of any of these publications apply to this standard only
5、 when incorporated in it by amendment or revision. For undated references, the latest edition of the publication referred to applies. DIN 4763 Grading of values for surface roughness parameters DIN 6784 Workpiece edges - Terminology, finishes and indications on drawings DIN 50014 Artificial climates
6、 in technical applications - Standard atmospheres IS0 6691 : 1989 Thermoplastics for plain bearings - Classification and designation IS0 121 28 : 1995 Plain bearings - Lubrication holes, grooves and pockets - Dimensions, types, designa- tion and their application to bearing bushes Continued on pages
7、 2 to 4. Translation by DI N-Sprachendienst. In case of doubt, the German-language original should be consulted as the authoritative text No pari of this translation may be reproduced without the prior permission of Ref. No. DIN 1850-6 : 1998-0 V Deutsches Institut fur Normung e. V., Berlin. Luth Ve
8、rlag GmbH, D-10772 Berlin, hac the exclusive right of sale for German Standards (DIN-Normen). English price group 05 Sales No. 0105 03.99 Page 2 DIN 1850-6 : 1998-07 d, 3 Dimensions and designation The tolerance grade (IT) shall be based on d, for coaxiality tolerances and on d, for axial runout tol
9、erances. f max. Type S Cylindrical bearing Type T Flanged bearing r s I 16 22 + 0,33 +0,11 Designation for a S type cylindrical bearing made from type PA 6 thermoplastic material, tolerance class A, with an inside diameter, d, of 20 mm and a width, b, of 20 mm: Bearing DIN 1850 - S 20 A 20 - PA 6 Ta
10、ble 1: Dimensions and tolerances B I d13 I h13 I h13 t0,21 + 0,07 10 I 16 I + 0.27 + 0,09 22 20 25 10 15 20 3 15 I 21 I 1271101151201 3 I 18 I 24 I 20 26 I I zbll 32 20 30 1341151201301 3 + 0,45 +0,15 1361151201301 3 I 25 I 32 38 20 30 40 4 40 20 30 40 4 (27) I 34 I 1421201301401 4 1441201301401 4 +
11、 0,60 + 0,20 46 20 30 40 4 48 20 30 40 5 (continued) Page 3 DIN 1850-6 : 1998-07 I 4 Limit deviation for tolerance class Table 1 (concluded) d, 6, 62 f r 4 (nominal size) Nom in a I size A 73 83 B I d13 1 h13 1 h13 I rnax. I 40 50 70 5 12 03 40 60 80 7,5 12 0,8 95 1 O0 105 50 70 90 7,5 13 1 50 70 90
12、 795 1,5 1 60 80 1 O0 7,5 13 1 120 125 130 60 80 120 10 1,5 1 60 1 O0 120 10 13 1 80 1 O0 120 10 1,5 1 135 140 80 1 O0 120 10 13 1 80 1 O0 120 10 13 1 220 230 150 180 250 15 3 2 150 180 250 15 3 2 + 0,69 C0.23 54 30 40 50 58 30 40 60 60 30 40 60 63 30 40 60 66 40 50 60 68 40 50 60 zbll 45 55 48 58 6
13、0 +0,90 + 0.30 BY agree- ment +-+ 75 90 I 88 I 50 I 60 I 80 I 7,5 I 1,5 I 1 +-+ 110 I 110 I 60 I 80 I 100 I 7,5 I 1,5 I 1 105 125 150 160 zal 1 %J+ 21 o 220 200 I 230 Sizes in brackets are for special applications only and should be avoided if possible. Depending on the material used, the wall thick
14、ness shall be designed so that the inside diameter, d, of the fitted bearing lies within tolerance C11 or D12. 4 Material Thermoplastic bushes may be made, for example, from type PA 6, cast PA 6, PA 66, PA 12, PBT, PET, PE, or POM plastics, as specified in IS0 6691. Details concerning modified versi
15、ons or other types of thermoplastics shall be subject to agreement between customer and supplier. NOTE: Thermoplastics have a greater coefficient of linear thermal expansion than metals. In addition, plastics of types PA 6, cast PA 6 and PA 66 absorb more moisture than the other types listed above,
16、and will therefore also increase in volume. Page 4 DIN 1850-6 : 1998-07 The tolerances and fits specified in this standard consider the following: a) The bearing clearance allows for a working temperature of -10 to +50 “C and a relative humidity of between 20 and 1 O0 YO. b) The interference fit of
17、the bearing depends on the tolerance on d, and the fit is maintained at working temperatures of -1 O to +50 “C. c) The shaft and bush are made from steel or from material with a similar coefficient of linear thermal expansion. Where different service conditions prevail, the clearance and the method
18、of fitting the bearing shall be checked. The tolerances given here apply to bearings in a conditioned state, .e., they have reached a temperature and moisture content which correspond to those of a DIN 5001 4 - 23/50-2 standard atmosphere. Bearings made from thermoplastics of type PA 6, cast PA 6 or
19、 PA 66 must be kept in the atmosphere given above (cf. DIN 50014 - 23/50-2) or under airtight seal. 5 Design and finish The edges of the bearing shall be free of burrs with a D 3 type finish as specified in DIN 6784. The edges of the bore shall be chamfered or rounded so that the outside of the bear
20、ing is not damaged by fitting. If bushes are to be both press-fitted and bonded, helical grooves may be added to the outside. Table 2: Finishes and tolerances Tolerance Manufacturing group process Injection-moulded Machine-finished *) RZ or Ra, by agreement. Surface roughness of bearing*) (cf. DIN 4
21、763), in pm Tolerance on d, Tolerance for Tolerance for press-fitting the bore the shaft 25 6,3 100 25 pl c11 H7 h9 6 Testing The bearing shall be tested in its fully conditioned state (cf. note in clause 4). In order to measure diameter d, the bearing shall be inserted consecutively into two ring g
22、auges, of which one corresponds to the maximum size and one to the minimum size of tolerance H7 of the bore. When the bearing is inserted into the smaller of the two ring gauges, its inside diameter shall be not less than the lower deviation for tolerance D12 or C1 1 . When the bearing is inserted i
23、nto the larger of the two ring gauges, its inside diameter shall be not more than the upper deviation for tolerance D12 or C1 1 . The width of ring gauges shall be greater than that of the bearing. For gauging, equipment is recommended which permits bores to be measured which are not absolutely cylin- drical. Bibliography DIN 1850-3 DIN 1850-4 DIN 1850-5 IS0 4379 : 1993 Plain bearings - Sintered bushes Plain bearings - Artificial carbon bushes Plain bearings - Thermoset bushes Plain bearings - Copper alloy bushes
