A problem to be addressed by the present invention is to provide a hollow structure, particularly propeller blade, having excellent productivity, high strength, light weight, and high quality. The gist of the present invention is to provide a hollow structure made of a resin, including: a skin portion forming the outer surface of the hollow structure; a retaining section integrated with the skin portion, and supporting the skin portion from the inside thereof; and a space in the structure; wherein at least one of the retaining sections is configured to define, from a point of joining, the shortest line segment connecting a face of joining including the point of joining to the opposed face of joining, and is configured such that, in a cross section (referred to as a "cross section 1" for convenience) taken by cutting the structure along a plane passing through the midpoint of the line segment, and including a cross section perpendicular to the line segment, a straight line crosses the skin portion and the retaining section at three or more points, the straight line (referred to as a "straight line 1" for convenience) connecting the midpoints of the short sides of a rectangle defined so as to circumscribe the cross section, and have the minimum area.
HOLLOW STRUCTURE AND PROPELLER BLADE
HOHLSTRUKTUR UND PROPELLERBLATT
STRUCTURE CREUSE ET PALE D'HÉLICE
04.09.2024
Patent
Elektronische Ressource
Englisch
Propeller blade or airfoil with hollow composite root
Europäisches Patentamt | 2024
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