1、AECMA STANDARD NORME AECMA AECMA NORM Declassification approved Comments should be sent within six months after the date of publication to prEN 2905 Edition P 2 September 1998 C4 Chairman PUBLISHED BY THE EUROPEAN ASSOCIATION OF AEROSPACE INDUSTRIES (AECMA) Gulledelle 94 - B-1200 BRUXELLES - Tel. (+
2、32) 2 775 81 10 - Fax. (+32) 2 775 81 11 ICs: Supersedes issue P 1 April 1989 Descriptors: ENGLISH VERSION Aerospace series Rubber cushionings for clamps Dimensions - Masses Srie arospatiale Profils en caoutchouc pour colliers Dimensions - Masses Luft- und Raumfahrt Profilgummi fr Schellen Mae - Mas
3、sen This “Aerospace Series“ Prestandard has been drawn up under the re of AECMA-Members. It has been technically app Technical Committee following comment by the Mem Subsequent to the publication of this Pr an extent that interchangeability is of the standard. After examination nt shall not be chang
4、ed to y, without re-identifica tion rd Checking Centre INPSI and formal it will be submitted as a draft ation) for formal vote. Replace page 1 of the previous issue by this page 1998-09-30 AECMA Gulledelle 94 8-1 200 BRUXELLES Mr Staib aecrna 1998 COPYRIGHT Association Europeene Des Constructeurs de
5、 Materiel AerospaceLicensed by Information Handling ServicesIssue P 1 prEN 2905 Page 2 Contents 1 2 References 3 Required characteristics Scope and field of application 3.1 Material 3.2 Types - Pimensions - Tolerances - Masses 4 Designation 5 Techn ica I specification COPYRIGHT Association Europeene
6、 Des Constructeurs de Materiel AerospaceLicensed by Information Handling Services- AECMA PREN2705 87 W 1012311 0004382 5 - _ Issue P 1 prEN 2905 Page 3 1 Scope and field of application This standard specifies the required characteristics of rubber cushionings used on clamps to EN 2901, EN 2902 and E
7、N 2904 for the flexible guidance and support of aerospace tubings of all kinds. For temperature range see IS0 6771, type II. 2 References IS0 6771 EN 2261 EN 2429 EN 2838 EN 2842 EN 2901 EN 2902 EN 2904 - Aerospace construction - Fluid systems and components - Pressure -Aerospace series - Oil resist
8、ant silicone rubber VMQI - Hardness - Aerospace series - Ethylene-propylene rubber (EPM and EPMj - - Aerospace series - Heat resistant polychloraprene rubber (CRj - - Aerospace series - Mineral oil resistant acrylonitrile-butadiene -Aerospace series - Clamps, loop IP type) with rubber cushioning - A
9、erospace series - Clamps, loop (P-type) with rubber cushioning -Aerospace series - Clamps, saddle in aluminium alloy - and temperature - Classifications 70 - Characteristics 1) Hardness 60 - Characteristics 1) Hardness 70 - Cliaracteristics i) rubber (NBR) - Hardriess 70 - Charecteristics 1) in corr
10、osion resisting steel - Dimensions - Masses 21 in aluminium alloy - Dimensions - Masses 21 Diinensions - Masses 2) 3 Required characteristics 3.1 Material 4) (Code letter C) - chloroprene rubber (Codo letter PI - acrylonitrile-butadiene rubber (Code letter SI - silicone rubber Code letter E) - ethyl
11、ene - propylene rubber 3.2 Types - Dimensions - Toleraiices - Masses Tlie configuration shall correspond with the figures. Dimensions shall correspond with the table. 1) In preparation 2) Published as AECMA prc-standard 3) Published as AECMA standard 4) The inaterial to be used is to be agreed betwe
12、en the manufUcturer and the user, pending publication of material standards. COPYRIGHT Association Europeene Des Constructeurs de Materiel AerospaceLicensed by Information Handling ServicesIssue prEN Size A B C D E HU Y UN 1) without I with +0,6 +0,3 +0,3 +0,6 wedge O O O 0 mm2 1 1K 95 12,3 2,5 0,8
13、3 27 6 to 17 to 28 28 3,4 33 4,3 47 - 5 - Table 1 - Dimensions Dimensioris in mi ttimetres - Wedge mass (negligible, about 0,l to 0,3 CJ) .Required cushion length in mm Cushion section in mm2 (see table 11 Elastomer specific mass in g/crn3 Cushion unit mass in y i) Diameter DN of the clamps see EN 2
14、901, EN 2902 and EN 2904 Length x results from the dimensions given in these dimensionai standards. Untoleranced dimensions : + - 0,4. The corresponding unit mass of cushion is given by the form : Types see table) Form without wedge : sizes according to code number (no code letter) Form with wedge (
15、form at manufacturers option) : sizes according to code number and code letter. COPYRIGHT Association Europeene Des Constructeurs de Materiel AerospaceLicensed by Information Handling ServicesAECMA PREN2905 A7 W LOL23LL OOOL1384 9 M - - Issue P 1 prEN 2905 Page 5 Number of EN standard 4 Designatiori
16、 Rubber cirshionings shall only be designated as in following example : Identity block I Description block I( or L = Cade letter for wedge, if required 25 = Cushion length X in rnm (for types with wedge only), Note : if necessary the originator code 19005 may be introduced between the description bl
17、ock and the identity block. 5 Technical specification The teclirical specification concerning the cushioning material to be used is to be agreed between the manufacturer and the user, pending publication of material standards. COPYRIGHT Association Europeene Des Constructeurs de Materiel AerospaceLicensed by Information Handling Services
