1、EUROPEAN STANDARD EN 2285 NORME EUROPENNE EUROPISCHE NORM 2ecember 1989 UDC : 629.7.02+05:621.887-408.2-72.004.1:669.71. Key words : Aeronautical industry, bush, aluminium alloy, liner, self-lubricating piece, dimension. English version Aerospace series Bushes, plain aluminium alloy with self-lubric
2、ating liner Dimensions and loads Srie arospatiale Bagues cylindriques en alliage daluminium a garniture autolubrifiante Dimensions et charges Luft- und Raumfahrt Buchsen ohne Flansch a us Al um in um- Legierung mit selbstschmierender Beschichtung Ma,e und Belastungen This European Standard was accep
3、ted by CEN on 1988-1 1-03. CEN members are bound to comply with the requirements of CEN Internal Regulations which stipulate the conditionsfor giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such natio
4、nal standards may be obtained on application to the CEN Central Secretariat or to any CEN member. This European Standard exists in three official versionc(English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and
5、notified to CEN Central Secretariat has the same status as the official versions. CEN members are the national standards organizations of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxemburg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and Uni
6、ted Kingdom. CEN European Committee for Standardization Comite Europen de Normalisation Europisches Komitee fr Normung Central Secretariat : Rue Brderode 2, B-1 O00 Bruxelles CEN 1989 Copyright reserved to all CEN members - Ref. Nr EN 2285 : 1989 E I CEN EN*Z285 89 m 3404589 OOLbL4b 2 m EN 2285 Page
7、 2 This Europea (AECM A). Si dard has bee Brief history prepared by the European Ass ciation of Aerospace Manufacturers After inquiries and votes carried out in accordance with the rules of this Association, this Standard has successively received the approval of the National Associations and the Of
8、ficial Services of the member countries of AECMA, prior to its presentation to CEN. According to the Common CEN/CENELEC Rules, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxemburg, Nethe
9、rlands, NorGay, Portugal, Spain, Zwe:ez, Switzerland and United Kingdom. 1 Scope T1j s standard specifies the characteristics of plain bushes in aluminiurr! o11-0 with self-lubricating liner and t5e deslpn recommendation of shafts and housings, 2 Fjeld of application The bushes are 5,ntended for ope
10、ration within the temperature range of -55 OC: to +150 C: and assembly with an interference fit into fixed and moving aerospace parts. 3 References E4 2086, Aluminium alloy 2618A-T851 (Al-Pll-T851 - Forged bars 2nd slabs a 150 mm - Aerospace series 1) Aerospace series - Chrcmic acid anodizing OC -a!
11、.uminium and wrought aluminium allovs 1) - EN 2101, EN 2284, Aerospace series - Sulphuric acid anodizing of aluminium and wrought aluminium al!.oys 1 ) EN ?311, Aerospace series - Bushes w7th self lubricating liners - Technical s p e c i f j. ca t i on 4 Required characteristics 4.1 Configuration -
12、Dimensions - Tolerances - Masses Configuration : see figure I. Dimensions, tolerances and masses : see figure 1 and table 1. Dimensions and tolerances apply after surface treatment. 4.2 Surface roughness See figure 1. 4.3 Materials Bush : Aluminium alloy EN 2086. Liner : Self-lubricating wear ressta
13、nt material. consistent with the recuire- mints of EN 2311. 4.4 Surface treatment Chromic acid anodizing EN 2101A or Sulphuric acfd anodfzing EN 22846. I.) Published as AECMA standard. CEN EN*Z285 89 3404589 OOLbL48 b “ EN 2285 Page4 Figure 1 Table 1 Dimensions in millimetres 8 10 - 12 15 16 - - 18
14、20 - 22 25 - 28 30 32 - 35 40 45 - 50 f 21 f5 f 33 t6 - t 40 tl - E 48 I-9 X (2,5:1) + 0,25 or5 0 si II harnfer or radius - u,4 I 6 8 10 12 15 i6 18 20 22 25 28 30 32 35 40 45 50 _- 2 5. Mass in kg/l O00 pieces I= Only bushes whose masses lie within lhe bold lines are standard. The recommended sizes
15、 are indicated by . Table 2 12 8 d mm 24.7 20.6 22 103.0 85.8 40- 18.2 15.4 25 118.5 98.8 8 10 12 15 - 16 18 20 Permissible tadial load Permissible radiai load Permissible radial load Static Dynamic d Dynamic mm hm d L mm mm Static Dynamic cs 1 c25 2) c25 2) cs 1) c25 2) 153.8 197.8 164.8 I kN k# k#
16、 kN kN mm 6 42 4,l 15 I 538 44.7 32 6 6.6 5.5 20 I 74,2 61.8 20 12.: 10.3 81,6 68.0 165.8 138.2 10 16.5 13,8 22 I 90.6 75.5 201,9 168.3 198.3 3 I 230.7 I 192,3 I 35 I 271,9 I 226.6 15 8 40.2 I 33.5 19.6 16.5 15 I 750 62.5 20 103.8 86.5 28 22 115.4 96.2 25 132.7 110.6 45 28 150,O 125.0 1 15 1 80.3 66
17、.9 260.9 259.6 216.3 305.9 254.9 352.3 293.6 398.5 332.1 15 16 - 10 12 - 15 18 - 38.4 123.6 103.0 29.7 24.8 142,l 118,4 37. 30.9 1 25 I 236.9 I 197.4 30 288.4 240.3 1 35 I 339.9 I 283.3 50 40 391.4 I 326.2 442.9 369.1 494.4 41 2.0 1) Ct = 0,206d (L - 21 kN. 2) Definitions for C25 ad ultimate static
18、loads, see EN 231 1. CEN EN*K2285 89 m 3404589 00LbL50 4 =! 3- _. EN 2285 Page 6 Description block Identity block EN2285-1208 - 6 Marking In addition to the manufacturers om marking each bush and its package shall be marked with the identity block specified in clause 5 of this standard. Marking posi
19、tion and method are at manufacturers option, and shall not have any detrimental effect on the bush. 7 Technical specification Bushes supplied to this standard shall conform with the requirements of techni- cal specification EN 2311. The loads given in table 2 of this standard are only applicable und
20、er the conditions given in EN 2311. 8 Design recommendation Bushes defined by this standard are intended to be installed by interference fit methods (see figure 2). Therefore, the loads given in table 2 can only be insured if the following mounting is applied. - Shaft Figure 2 Hardness of the shaft : 45 HRC Surface roughness of the shaft : See figure 2 The reduction in bore diameter d (see figure 1) due to interference fit of the bush in the housing has been taken into account when selecting tolerances for the shaft : f6 (clearance fit) or j6 (transition fit).
