1、DEUTSCHE NORM Julv 1998 Plain bearings Part 5: Thermoset bushes DIN 1850-5 ICs 21.100.10 Descriptors: Plain bearings, bushes, thermosets. Supersedes August 1975 edition. Gleitlager - Teil 5: Buchsen aus Duroplasten In keeping with current practice in standards published by the International Organiza
2、tion for Standardization (ISO), a comma has been used throughout as the decimal marker. Dimensions in mm Foreword This standard has been prepared by the Normenausschu Gleitlager (Plain Bearings Standards Committee). Amendments The standard has been completely revised. Previo us edit ions DIN 16902:
3、1944-10; DIN 1850-1: 1959-05; DIN 1850-5: 1975-08. 1 Scope This standard specifies dimensions, tolerances, materials, finish and test methods for thermoset *) bushes used as plain bearings, with or without lubrication grooves as in IS0 121 28. 2 Normative references This standard incorporates, by da
4、ted or 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 standa
5、rd only 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 7708-2 Types of plastic moulding materials - Phenolic moulding materials DIN 7724 Classificatio
6、n of polymer materials on the basis of the effect of temperature on their mechanical behaviour - Principles and concepts DIN 16901 Plastics mouldings - Tolerances and acceptance conditions for linear dimensions DIN 5001 4 Artificial climates in technical application - Standard atmospheres IS0 286-1
7、: 1988 IS0 system of limits and fits - Part 1 : Bases of tolerances, deviations and fits IS0 2768-1 : 1989 General tolerances - Part 1 : Tolerances for linear and angular dimensions without individual tolerance indications IS0 121 28 : 1995 Plain bearings - Lubrication holes, grooves and pockets - D
8、imensions, types, desig- nation and their application to bearing bushes *) See DIN 7724 for classification of polymer materials. Continued on pages 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
9、 translation may be reproduced without the prior permission of Ref. No. DIN 1850-5 : 1998-0 V Deutsches Institut fur Normung e. V., Berlin. Luth Verlag 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
10、-5 : 1998-07 3 Dimensions and designation General tolerances shall be class m tolerances as in IS0 2768-1. The tolerance grade (IT) shall be based on d, for coaxiality tolerances and on d, for axial runout tolerances. Type P Cylindrical bearing Type R Flanged bearing Designation for a P type cylindr
11、ical bearing made from type Hgw 2088 thermoset material, with an inside diameter, d, of 18 mm and a width, b, of 20 mm, and having helical grooves on the outside (W), a 15“ chamfer (Y), and an undercut (Z) in place of radius r. Bearing DIN 1850 - P 18 x 20 WYZ - Hgw 2088 Table 1: Dimensions and tole
12、rances NOTE: Sizes in brackets are for special applications 01 I I I 1 1 1 50 I 60 I 68 1 40 I 50 I 60 I 5 I 0.8 1 0.8 55 65 73 40 50 70 5 0,8 0,8 60 75 83 40 60 80 7.5 0.8 0.8 I I I I 1 111 65 I 80 I 88 I 50 I 60 I 80 I 7.5 I 1 I 1 I I I I 1 75 90 100 50 70 90 73 1 1 I I I I 1 I I I , , I I I I 1 1
13、 1 1 I I I I 1 1 1 1 100 I120 I130 I 80 I100 I120 I10 I 1 1 1 I I I l 1 1 1 1 105 I125 I135 I 80 I100 I120 I10 I 1 1 1 I I I I 1 1 1 1 110 I130 I140 1 80 I100 1120 I10 I 1 I 1 I I I I 1 120 I140 I150 I 100 I120 1150 110 I 1 I 1 130 I150 I160 I100 I120 1150 Il0 I 2 I 2 140 I160 I 170 I 100 I150 1 180
14、 Il0 I 2 I 2 150 160 170 180 190 200 21 o 220 230 - - 240 250 and should be avoided if Dossible. Page 3 DIN 1850-5 : 1998-07 Over dl UP to Limit deviations Over d, UP to - 6 10 14 18 24 30 40 50 65 80 100 120 140 160 180 200 220 6 10 14 18 24 30 40 50 65 80 100 120 140 160 180 200 220 250 +O09 +O13
15、+O17 +O22 +O27 +O34 +O42 +O50 +O60 +O73 +O89 +lo4 +li9 +134 +i49 +164 +187 t205 +0:07 +0:10 +0:14 +0:18 +0:22 +0:28 +0:35 +Or42 +0:51 +0:63 +0:78 +O192 +1:06 +1:20 +1:34 +1:48 +1:70 +1:87 - 10 16 20 24 30 38 50 60 80 95 120 140 160 185 210 230 250 10 16 20 24 30 38 50 60 80 95 120 140 160 185 210 23
16、0 250 280 Limit deviations 4 Material Thermoset bushes may be made, for example, from grade FS 74 material as specified in DIN 7708-2. Details shall be a matter of agreement between customer and supplier. +0,06 +O08 +0,11 +0,14 t0,17 +O21 +O26 +O31 +O37 +O45 +O56 +O65 to74 +O83 to92 +lo1 ti 16 ti27
17、+0,03 +0:05 +0,07 +0,09 +0,11 +0:14 +0:18 +0:22 t0:27 +0:34 t0:44 +0:52 +0:60 +O: t0:76 +0:84 +0:98 +1:08 5 Design and finish Surface roughness shall be as follows, using the ten point height of irregularities, Ra, or the arithmetic deviation of the profile, RZ, as specified in DIN 4763, by agreemen
18、t. a :RZ=2,5pm Ra = 6,5 pm (y:;:,= 1;: Edges shall be free of burrs, the type of edge-finishing being optional. With a 45“ chamfer, no extra specification is necessary in the order; however, with a 15“ chamfer, the order designation shall include the letter Y. All other chamfers shall be subject to
19、agreement between customer and supplier. If bushes are to be both press-fitted and bonded, the outside may be provided with helical grooves up to 3 mm wide and 0,3 mm deep. NOTE: Other tolerances and surface finishes may be more suitable for bushes which are to be bonded, because they need not alway
20、s be press-fitted. All other surface finishes shall be agreed when ordering, and custom- ers are referred to the manufacturers of the adhesive or the bearings. The letter W shall be used to specify helical grooves on the outside, with form and number being optional, and the letter Z to specify an un
21、dercut in place of radius r, of a type to be determined by the manufacturer. The recommended tolerance class forthe housing bore is H7 and that forthe shaft is h7. Bearings manufactured in accordance with this standard are usually produced by machining semi-finished material orthey are machine- fini
22、shed, taking into account the limit deviations given in table 2. For bearings which are not machine-finished, see DIN 16901. 6 Testing The following factors shall be observed when testing plain bearings: a) The influence of external conditions Because of the influence of ambient conditions on the di
23、mensions of plain bearings made from plastics, a standard atmosphere should be agreed on. Since plastics are poor conductors of heat, the bearings shall be given sufficient time to reach the agreed test temperature. NOTE: Bearings made from plastics which tend to absorb moisture can be kept in a sta
24、ble state (dry or with specific water content) by sealing them in polyethylene. b) Plastics are less rigid and softer than metals If too much pressure is used in testing, elastic deformation may occur and falsify the test results. Bearings made from plastics should therefore be measured with equipme
25、nt which requires a low contact pressure or is contactless, such as micrometers, calipers, snap gauges, ring gauges or plug gauges. NOTE: Ring gauges and plug gauges are the preferred measuring tools. c) Test schedule Testing shall be carried out at least 24 hours after the test piece has been manuf
26、actured, or after any subsequent treatment, in DIN 5001 4-23/50-2 standard atmosphere. The method of testing and any after-treatment, such as conditioning or heat treatment, are subject to agreement between customer and supplier. Page 4 DIN 1850-5 : 1998-07 6.1 Scope of testing Test A The outside di
27、ameter shall be measured using a ring gauge; the inside diameter shall be measured using a plug gauge. Test B The outside diameter shall be measured using a ring gauge; the wall thickness shall be measured using a two- point contact gauge ). Test C The inside diameter shall be measured using a plug
28、gauge; the wall thickness shall be measured using a two- point contact gauge ). Test D The inside diameter shall be measured using an inside gauge”; the wall thickness shall be measured using a two-point contact gauge I). 6.2 Test procedure a) Measuring the outside diameter with a ring gauge A GO an
29、d a NOTGO ring gauge shall be used to measure the outside diameter of the bearing. The bearing shall pass through the GO gauge without changing shape when manual pressure is exerted, but shall not pass through the NOT GO gauge. NOTE: Changes to the shape of the bearing are those which could cause gr
30、ooves or bumps in subsequent use. Ring gauges shall be manufactured to a tolerance equal to IYz IT 3 as in IS0 286-1. b) Measuring the inside diameter with a plug gauge The bearing shall be inserted into a ring gauge with a diameter in the middle of the tolerance zone of the bearing outside diameter
31、, and whose width shall be equal to the width of the bearing. After the bearing has been inserted, the inside diameter shall be measured with two plug gauges (GO and NOT GO). This method shall also be used for random testing where changes to the shape of the bearing cannot be ruled out. Ring and plu
32、g gauges shall be manufactured to a tolerance equal to IYz IT 3 as in IS0 286-1. c) Measuring the inside diameter with an inside gauge The bearing shall be inserted into an adapter ring similar in width and material to the bearing ring employed in normal use, and whose inside diameter is equal to th
33、e maximum measured bearing outside diameter. Referring to the drawing and using a ring gauge, the inside gauge shall be set at zero for the nominal inside diameter. The bearing shall then be inserted into the adapter ring and its actual inside diameter determined. The sum of the difference between t
34、his measurement and the nominal inside diameter gives the actual inside diameter. d) Measuring the wall thickness with calipers A set of calipers shall be used to measure the wall thickness by comparing the actual thickness with the nominal thickness with the help of gauge blocks. The actual thickne
35、ss shall be determined by means of the measuring points soldered to the tips of the calipers. The nominal thickness shall be established, the dial set to zero, and the mean difference from three subsequent measurements of the wall thickness calculated. This value shall be added to the nominal wall t
36、hickness, taking the sum as the actual wall thickness. Other relevant standards DIN 1850-3 Plain bearings - Sintered bushes DIN 1850-4 Plain bearings - Artificial carbon bushes DIN 1850-6 Plain bearings - Thermoplastic bushes IS0 4379 : 1993 Plain bearings - Copper alloy bushes I) The use of calipers is preferable forthese measurements, because atwo-point contact gauge exerts constant z, An inside gauge can also be used where thermal expansion or moisture has caused the bearing to change pressure. shape.
