NEEDLE SLEEVE AND METHOD OF ITS MANUFACTURE, AND METHOD FOR DETERMINING CONNECTION STRENGTH Russian patent published in 2023 - IPC F02F1/00 F16J10/04 

FIELD: needle sleeve.

SUBSTANCE: invention can be used in a needle sleeve containing protrusions on the surface. The needle sleeve contains one or multiple tapered protrusions (10) on the surface. The number of tapered protrusions (10) per 100 mm² of all protrusions is designated as Pc. The average height of the protrusions (10) is indicated as h (mm). The average maximum thickness of any 20 protrusions (10) of all tapered protrusions (10) is indicated as dw (mm). The average minimum thickness of any 20 protrusions (10) of all tapered protrusions (10) is indicated as dn (mm). The sum of (I) and (II) as defined below is 1.55 or greater. The quantity (I) is defined as (I) = Pc×[(0,35hπ/12)×(2dw²-dw×dn-dn²)]. The quantity (II) is defined as (II) = Pc×{(dn²/4)× π×0,35h}. A method for determining the strength of a complex connection, a method for manufacturing a needle sleeve, and a needle sleeve are disclosed.

EFFECT: improving the strength of the connection when combined with metal on the side of the outer peripheral surface.

8 cl, 5 dwg, 2 tbl