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Foldable rotor assembly for fixed-wing vtol aircraft

A vertical take-off and landing, fixed-wing technology, applied to vertical take-off and landing aircraft, aircraft, unmanned aircraft, etc., can solve the problems of creating resistance and hindering wing-loaded flight

Active Publication Date: 2019-03-29
THE BOEING CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One problem is that when the hovering rotor stops, it can create drag and impede wing-borne flight

Method used

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  • Foldable rotor assembly for fixed-wing vtol aircraft
  • Foldable rotor assembly for fixed-wing vtol aircraft
  • Foldable rotor assembly for fixed-wing vtol aircraft

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0074] Figure 12 is an isometric view of rotor assembly 110 in the deployed configuration in the illustrated embodiment. Hub assembly 602 is mounted on output shaft 902, which is a cylindrical shaft that extends upwardly from motor 1204 and is driven for rotation by motor 1204. As above, hub assembly 602 includes inner hub 920 and outer hub 930 . The body member 922 of the inner hub 920 slides onto the output shaft 902 and is rigidly attached thereto. Blade shank 924 of inner hub 920 is attached to the tip of rotor blade 605 . In this embodiment, blade shank 924 is rigidly attached to rotor blade 605 (such as with a plurality of bolts), but may be pivotally attached to rotor blade 605 in other embodiments.

[0075] Body member 932 of outer hub 930 is mounted on inner hub 920 via one or more angular contact bearings 940 such that outer hub 930 rotates relative to inner hub 920 . Blade shank 934 of outer hub 930 is attached to one end of rotor blade 604 . In this embodimen...

example 2

[0079] Figure 16 is an isometric view of rotor assembly 110 in a deployed configuration in another example embodiment. The hub assembly 602 is mounted on the output shaft 902 of the motor (not visible). As above, the hub assembly 602 includes an inner hub 920 and an outer hub 930 . The body member 922 of the inner hub 920 slides onto the output shaft 902 and is rigidly attached to the output shaft 902 . Blade shank 924 of inner hub 920 is attached to one end of rotor blade 605 . Body member 932 of outer hub 930 is mounted on inner hub 920 via one or more angular contact bearings 940 such that outer hub 930 rotates relative to inner hub 920 . Blade shank 934 of outer hub 930 is attached to one end of rotor blade 604 .

[0080] Figure 17 is a side view of rotor assembly 110 in the deployed configuration in an example embodiment. In this embodiment, a cylindrical bore 927 in body member 922 of inner hub 920 encloses or surrounds motor 1704 , which drives output shaft 902 ...

example 3

[0084] Figure 20 is an isometric view of rotor assembly 110 in a deployed configuration in another example embodiment. Hub assembly 602 is mounted on output shaft 902 of motor 2004 . As above, the hub assembly 602 includes an inner hub 920 and an outer hub 930 . The body member 922 of the inner hub 920 is slid onto the output shaft 902 and is rigidly attached to the output shaft 902 . Blade shank 924 of inner hub 920 is attached to one end of rotor blade 605 . Blade shank 924 includes a pair of arms 925-926 extending from body member 922 with a gap therebetween. Body member 932 of outer hub 930 is mounted on inner hub 920 via one or more angular contact bearings 940 for rotation of outer hub 930 relative to inner hub 920 . Blade shank 934 of outer hub 930 is attached to one end of rotor blade 604 . In this embodiment, the gap between the arms 925-926 of the blade shank 924 is widened so that the outer hub 930 is mounted on an angular contact bearing 940 between the arms ...

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Abstract

A fixed-wing VTOL aircraft with a rotor assembly. The rotor assembly is configured to provide vertical flight for the fixed-wing VTOL aircraft. The rotor assembly includes a hub assembly, a first rotor blade affixed to the hub assembly, and a second rotor blade affixed to the hub assembly. The hub assembly orients the second rotor blade in relation to the first rotor blade about an axis of rotation of the hub assembly with the first rotor blade and the second rotor blade vertically stacked when the hub assembly is stopped for wing-borne flight.

Description

technical field [0001] This disclosure relates to the field of rotors for vertical take-off and landing (VTOL) aircraft. Background technique [0002] A vehicle that can take off, hover and land vertically is called a VTOL vehicle. A VTOL aircraft has one or more rotors that produce vertical lift. Some VTOL aircraft also have fixed wings that generate lift when the aircraft is propelled forward by propellers, jet engines, and the like. When these fixed-wing aircraft change from vertical to horizontal or wing-borne flight, one or more hovering rotors are turned off. One problem is that when a hovering rotor stops, it can create drag and impede wing-borne flight. Contents of the invention [0003] Embodiments described herein provide an improved rotor assembly for a fixed-wing vertical take-off and landing aircraft in which the blades of the rotor assembly fold when the rotor assembly is stopped. Due to the structure of the rotor assembly, the blades can be stacked verti...

Claims

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Application Information

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IPC IPC(8): B64C27/08B64C29/00B64C27/50B64C27/48
CPCB64C27/48B64C27/50B64C29/00B64U70/80B64U30/20B64U30/10B64C11/04B64C11/28B64C27/26B64C27/30B64C29/0025B64C39/024B64C27/473
Inventor M·J·杜菲M·S·斯托弗
Owner THE BOEING CO
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