IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0408018
(1989-09-15)
|
우선권정보 |
FR-0007981 (1987-06-09) |
발명자
/ 주소 |
- Barbier Bruno J. M. (Sannois FRX) Michaud-Soret Jean A. (Paris FRX)
|
출원인 / 주소 |
- Societe Nationale Industrielle Aerospatiale (Paris FRX 07)
|
인용정보 |
피인용 횟수 :
17 인용 특허 :
4 |
초록
▼
The blade of composite materials and its manufacturing process according to the invention are such that the spar includes at least one bundle (10a, 10b) extending longitudinally in the shell (4), between the fillings of the leading edge (12a) and the trailing edge (12c) and which adheres directly to
The blade of composite materials and its manufacturing process according to the invention are such that the spar includes at least one bundle (10a, 10b) extending longitudinally in the shell (4), between the fillings of the leading edge (12a) and the trailing edge (12c) and which adheres directly to the laminated pressure face and suction face coverings, (4a, 4b) of the rigid shell (4). Beyond the blade footing (3), the spar is shaped to form a root loop flexible in torsion (8) and passing round an attaching socket (9) on the hub. Application to variable pitch multi-blade propellers for the streamlined tail rotors of helicopters.
대표청구항
▼
Process for manufacturing a blade, by means of a lower half-mould and an upper half-mould providing complementary impressions having respective forms of a pressure face portion and a suction face portion of the blade, comprising: desposting in the lower half-mould a panel of each of separate layers
Process for manufacturing a blade, by means of a lower half-mould and an upper half-mould providing complementary impressions having respective forms of a pressure face portion and a suction face portion of the blade, comprising: desposting in the lower half-mould a panel of each of separate layers of fabric and mats or sheets of reinforcing fibers with high mechanical strength impregnated with a polymerisable synthetic resin, and designed to constitute a pressure face covering of a shell of the blade, putting in place, over the panels, materials constituting filling bodies, and in an area of a blade footing, the layers of fabric and mats or sheets of reinforcing fibers, impregnated with a polymerizable synthetic resin, of the pressure face portion of the shell, putting in place, over the panels and layers of fabric and mats or sheets of fibers for reinforcing the pressure face portion of the blade, and between the filling bodies, end portions, designed to be fixed in the shell, of two bundles of an elongated skein folded back on itself, constituted by rovings of aramide fibers agglomerated by a polymerisable synthetic resin designed to form a spar of the blade, and arranging, beyond a corresponding end of the panels, layers of fabrics and mats or sheets of reinforcing fibers and filling bodies, the portions of the two bundles that are in the vicinity of an area of folding so as to form a loop designed to constitute a root portion of the spar, and that passes round a metallic socket placed in the lower half-mould, a putting in place, in the area of the blade footing and over the spar, the layers of fabric and mats or sheets of reinforcing fibers impregnated with a polymerizable synthetic resin of the suction face portion of the shell, arranging on the whole thus formed in the lower half-mould, a panel of each of the layers of fabrics and mats or sheets of fibers with high mechanical strength impregnated with a polymerizable synthetic resin designed to constitute a suction face covering of the shell, placing the upper half-mould on the lower half-mould placing the rovings of the two bundles of the skein of the spar in longitudinal traction, substantially parallel to a longitudinal axis of the blade, closing the mold, polymerising the resin or resins impregnating and/or agglomerating all of the elements enclosed in the mould, so as to mould the blade in a single operation, maintaining traction on the rovings throughout polymerisation; and after polymerisation is complete, removing the blade from the mould.
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