Flapping restrainer device for rotorcraft rotor blades, and rotor head comprising said device
First Claim
1. A flapping restrainer device for the blades of a rotorcraft main rotor, of the type including a hub mast assembly having a retaining means for the retention and articulation of the blades on the hub and at least one tubular part below the retaining means, comprising:
- lower flapping restrainer means for restraining flapping of the blades, said lower flapping restraining means comprising at least one rigid component for support of the blades, said at least one rigid component being mounted to slide radially on a support fixed coaxially in the tubular part of the hub mast assembly;
each said blade having a lower supporting runner connected for movement with a root of the respective said blade so as to limit the displacement of each respective said blade in a downward direction by engagement with said at least one rigid component;
wherein said at least one rigid component is a plate having a plurality of branches;
resilient restoring means for resiliently biasing said plate toward a predetermined position;
wherein the number of said branches is equal the number of said blades, said plurality of branches being regularly distributed in a circumferential direction about said plate, each of said plurality of branches extending outwardly in a direction which is substantially radial in relation to said plate;
each of said plurality of branches being engaged in respective openings disposed in said hub mast assembly, wherein each said lower supporting runner is disposed substantially entirely externally of said hub mast assembly, and wherein each said lower supporting runner is restrained against said external radial end of a corresponding one of said branches to limit downward flapping of each corresponding said blade.
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Accused Products
Abstract
The invention relates to a flapping restrainer device for the blades of a rotorcraft main rotor, and a rotor head comprising the same. The lower restrainers comprise a reciprocal star-shaped plate (32), having as many radial branches (33) as blades, and each one of the branches being engaged into a radial opening (6) of the hub (3). Outside the latter, the star-shaped plate (32) cooperates with supporting runners (47) integral with the blades. The upper restrainers comprise, for each blade, a stop which is retractable by the effect of the centrifugal force and which is composed of a lever (52), pivoting on a pivot (53) carried by the hub (3), and a first arm (55) of which constitutes a stop finger directed towards an upper supporting component (60) integral with the blade, while a second arm (56) carries a governor weight (57) and a nose (58) for support against a shoulder (59) integral with the hub (3).
20 Citations
21 Claims
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1. A flapping restrainer device for the blades of a rotorcraft main rotor, of the type including a hub mast assembly having a retaining means for the retention and articulation of the blades on the hub and at least one tubular part below the retaining means, comprising:
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lower flapping restrainer means for restraining flapping of the blades, said lower flapping restraining means comprising at least one rigid component for support of the blades, said at least one rigid component being mounted to slide radially on a support fixed coaxially in the tubular part of the hub mast assembly; each said blade having a lower supporting runner connected for movement with a root of the respective said blade so as to limit the displacement of each respective said blade in a downward direction by engagement with said at least one rigid component;
wherein said at least one rigid component is a plate having a plurality of branches;resilient restoring means for resiliently biasing said plate toward a predetermined position; wherein the number of said branches is equal the number of said blades, said plurality of branches being regularly distributed in a circumferential direction about said plate, each of said plurality of branches extending outwardly in a direction which is substantially radial in relation to said plate;
each of said plurality of branches being engaged in respective openings disposed in said hub mast assembly, wherein each said lower supporting runner is disposed substantially entirely externally of said hub mast assembly, and wherein each said lower supporting runner is restrained against said external radial end of a corresponding one of said branches to limit downward flapping of each corresponding said blade. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A rotor head, for a rotorcraft main rotor having a plurality of blades, of the type comprising a hub mast assembly having at least one tubular part in communication with the exterior of said assembly by openings, the number of which is equal to that of the blades of said rotor and which are formed in said assembly and regularly distributed in a circumferential direction on the latter about an axis of rotation of said rotor, below means for the retention and articulation on said hub of pieces for connecting said blades to said hub, as well as a flapping restrainer device incorporating lower restrainers comprising a reciprocal central restrainer mounted to slide radially on a support fixed coaxially in said tubular part of said hub mast assembly and, for each of said plurality of blades, a lower supporting runner fixed on said corresponding connecting piece, in such a manner as to limit displacement of said blade in a downward direction by cooperation with said reciprocal central restrainer, wherein said flapping restrainer device comprises
lower flapping restrainer means for restraining flapping of the blades, said lower flapping restraining means comprising at least one rigid component for support of the blades, said at least one rigid component being mounted to slide radially on a support fixed coaxially in the tubular part of the hub mast assembly; -
each said blade having a lower supporting runner connected for movement with a root of the respective said blade so as to limit the displacement of each respective said blade in a downward direction by engagement with said at least one rigid component;
wherein said at least one rigid component is a plate having a plurality of branches;resilient restoring means for resiliently biasing said plate toward a predetermined position; and wherein the number of said branches is equal the number of said blades, said plurality of branches being regularly distributed in a circumferential direction about said plate, each of said plurality of branches extending outwardly in a direction which is substantially radial in relation to said plate;
each of said plurality of branches being engaged in respective openings disposed in said hub mast assembly, wherein each said lower supporting runner is disposed substantially entirely externally of said hub mast assembly, and wherein each said lower supporting runner is restrained against said external radial end of a corresponding one of said branches to limit downward flapping of each corresponding said blade;of which each one of said branches of said reciprocal central restrainer is engaged into one of said openings of said hub mast assembly, in such a manner that its external radial end is opposite a corresponding lower supporting runner outside said hub mast assembly. - View Dependent Claims (17, 18, 19, 20)
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21. A flapping restrainer device for the blades of a rotorcraft main rotor, of the type including a hub mast assembly having a retaining means for the retention and articulation of the blades on the hub and at least one tubular part below the retaining means, comprising:
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lower flapping restrainer means for restraining flapping of the blades, said lower flapping restraining means comprising at least one rigid component for support of the blades, said at least one rigid component being mounted to slide radially on a support fixed coaxially in the tubular part of the hub mast assembly; each said blade having a lower supporting runner connected for movement with a root of the respective said blade so as to limit the displacement of each respective said blade in a downward direction by engagement with said at least one rigid component, wherein said at least one rigid component is a plate having a plurality of branches, and wherein the number of said branches is equal the number of said blades, said plurality of branches being regularly distributed in a circumferential direction about said plate, each of said plurality of branches extending outwardly in a direction which is substantially radial in relation to said plate;
wherein each of said plurality of branches is engaged in respective openings disposed in said hub mast assembly, each said lower supporting runner is disposed substantially entirely externally of said hub mast assembly, each said lower supporting runner is restrained against said external radial end of a corresponding one of said branches to limit downward flapping of each corresponding said blade, said plate including said branches is star-shaped, and wherein said plate has a circular central recess.
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Specification