BS EN 2288-2019 pdf free download.Aerospace series – Bush, flanged, corrosion resisting steel, with self-lubricating liner – Dimensions and loads
This European standard specifies the characteristics of flanged bushes in corrosion resisting steel with self-lubricating liner and the design recommendation of shafts and housings.
The bushes are intended for operation within the temperature range of -55。C to 163 °C and assembly with an interference fit into fixed and moving aerospace parts.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
EN 2311, Aerospace series – Bushes with self-lubricating liner – Technical specification
EN 2424, Aerospace series – – Marking of aerospace products
EN 3161, Aerospace series – Steel FE-PM3801 (X5CrNiCu17-4) 一Air melted, solution treated and precipitation treated, bar a or D≤200 mm, Rm≥930 MPa
EN 3490，Aerospace series – Steel FE-PM3901 (X15CrNi17-3)- Air melted 一Hardened and tempered一Bar for machining- De ≤200 mm- 900 MPa≤Rm s1100 MPa .
3.Requirements
3.1 Configuration – Masses
Configuration: according to Figure 1.
Dimensions, masses: according to Figure 1 and Table 1.
3.2 Surface roughness
According to Figure 1.
3.3 Material
Bush: Steel according to EN 3490 or EN 3161.
Liner: Self-lubricating wear resistant material consistent with the requirements of EN 2311.
5 Marking
In addition to the manufacturer’s own marking, each bush and its package shall be marked with the identity block specifed in clause 4 of this standard.
The technology used by the manufacturer shall be stated within the identity block.
Marking position and method are at manufacturer’s option and shall not have any detrimental effect on the bush.
Bushes which are too small to be marked with the full information required shall have this on the package only.
See also EN 2424.
6 Technical specification
According to EN 2311. .
7 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 ensured if the following mounting is applied.
Hardness of the shaft: 50 HRC min.
Surface roughness of the shaft: according to 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).
When applied in actual usage, the coefficient of friction under load could be different from that defined in EN 2311, since it depends on the following shaft definitions: material, hardness, surface finish,surface treatment and installation conditions.
8 Quality management system
The manufacturer’s operations shall be an approved production organisation for aerospace products and shall demonstrate that it has implemented and is able to maintain a quality management system [e. g. according to EN 9100 or an equivalent aerospace accepted and established quality management system).BS EN 2288 pdf download.