Rotor span-balance pocket

Patent metadata

Field	Value
Publication number	US-10981647-B2
Application number	US-201715666654-A
Country	US
Kind code	B2
Filing date	Aug 2, 2017
Priority date	Aug 2, 2017
Publication date	Apr 20, 2021
Grant date	Apr 20, 2021

Abstract

The present invention includes a rotor-blade span-balancing system, including a span-balance pocket in a surface of a rotor blade; a cover operably configured to cover the span-balance pocket, wherein the cover is operably configured to be substantially flush with the surface of the rotor blade surface when covering the span-balance pocket, and wherein the cover includes a cover boss for reacting centrifugal force of the cover into the rotor blade; and one or more span-balance weights attached to the cover to span-balance the rotor blade.

First claim

What is claimed is:

1. A rotor-blade span-balancing system, comprising:
a span-balance pocket in a surface of a rotor blade;
a cover operably configured to cover the span-balance pocket, wherein the cover is operably configured to be substantially flush with the surface of the rotor blade surface when covering the span-balance pocket, and wherein the cover comprises a cover boss that is integral with the cover and in physical contact with an outboard edge of the span-balance pocket for reacting centrifugal force of the cover into the rotor blade;
one or more span-balance weights attached to the cover to span-balance the rotor blade with one or more weight fasteners; and
one or more weight bosses attached to the cover and extending through the one or more span-balance weights, wherein each of the one or more span-balance weights are in physical contact with one of the one or more weight bosses.

2. The system of claim 1 , wherein the rotor blade is a main rotor blade, a tail rotor blade, a proprotor blade, a propeller blade, or a wind-turbine blade.

3. The system of claim 1 , wherein the cover is attached to the rotor blade with one or more cover fasteners.

4. The system of claim 3 , wherein the one or more cover fasteners comprise one or more screws.

5. The system of claim 1 , wherein the cover boss is a machined integral portion of the cover.

6. The system of claim 1 , wherein the one or more weight fasteners comprise one or more bolts or one or more nuts.

7. The system of claim 1 , wherein the one or more weight bosses are integral with the cover, bonded to the cover, welded to the cover, fastened to the cover, or some combination thereof.

8. A method of rotor-blade span balancing, comprising:
providing a span-balance pocket in a surface of a rotor blade;
attaching a cover for the span-balance pocket to the surface of the rotor blade, wherein the cover is substantially flush with the surface of the rotor blade when covering the span-balance pocket, and wherein the cover comprises a cover boss that is integral with the cover and in physical contact with an outboard edge of the span-balance pocket for reacting centrifugal force of the cover into the rotor blade;
attaching one or more weight bosses to the cover; and
attaching one or more span-balance weights to the cover with one or more weight fasteners to span-balance the rotor blade, wherein the one or more weight bosses extend through the one or more span-balance weights and each of the one or more span-balance weights are in physical contact with one of the one or more weight bosses.

9. The method of claim 8 , wherein the rotor blade is a main rotor blade, a tail rotor blade, a proprotor blade, a propeller blade, or a wind-turbine blade.

10. The method of claim 8 , further comprising attaching the cover to the rotor blade with one or more cover fasteners.

11. The method of claim 10 , wherein the one or more cover fasteners comprise screws.

12. The method of claim 8 , wherein the integral cover boss is a machined integral portion of the cover.

13. The method of claim 8 , wherein the one or more weight fasteners comprise one or more bolts or one or more nuts.

14. The method of claim 1 , wherein the attaching one or more weight bosses to the cover comprises machining the cover to form the one or more weight bosses to be integral with the cover, bonding the one or more weight bosses to the cover, welding the one or more weight bosses to the cover, or fastening the one or more weight bosses to the cover.

15. A rotorcraft, comprising:
a fuselage;
one or more engines coupled to the fuselage; and
one or more rotor systems coupled to the one or more engines, each rotor system comprising rotor blades, at least one rotor blade comprising:
a span-balance pocket in a surface of a rotor blade;
a cover operably configured to cover the span-balance pocket, wherein the cover is operably configured to be substantially flush with the surface of the rotor blade when covering the span-balance pocket, and wherein the cover comprises a cover boss that is integral with the cover and in physical contact with an outboard edge of the span-balance pocket for reacting centrifugal force of the cover into the rotor blade;
one or more span-balance weights attached to the cover with one or more weight fasteners to span-balance the rotor blade; and
one or more weight bosses attached to the cover and extending through the one or more span-balance weights, wherein each of the one or more span-balance weights are in physical contact with one of the one or more weight bosses.

16. The rotorcraft of claim 15 , wherein the rotor blade is a main rotor blade, a tail rotor blade, a proprotor blade, a propeller blade, or a wind-turbine blade.

17. The rotorcraft of claim 15 , wherein the cover is attached to the rotor blade with one or more cover fasteners.

18. The rotorcraft of claim 15 , wherein the one or more cover fasteners comprise one or more screws.

19. The rotorcraft of claim 15 , wherein the cover boss is a machined integral portion of the cover.

20. The rotorcraft of claim 15 , wherein the one or more weight fasteners comprise one or more bolts or one or more nuts.

21. The rotorcraft of claim 15 , wherein the one or more weight bosses are integral with the cover, bonded to the cover, welded to the cover, fastened to the cover, or some combination thereof.

Assignees

• Bell Helicopter Textron Inc

Inventors

• Self Robert
• Green Nathan P
• Mccullough John R
• Cole Russell
• Sherrill Paul
• Wardlaw Robert

Classifications

• F05B2230/60

  Assembly methods · CPC title

• F03D3/062

  characterised by their construction elements · CPC title

• B64C27/473

  Constructional features · CPC title

• B64C27/82

  characterised by the provision of an auxiliary rotor or fluid-jet device for counter-balancing lifting rotor torque or changing direction of rotorcraft · CPC title

• B64C27/46

  Blades · CPC title