Adjustable pitch link

Patent metadata

Field	Value
Publication number	US-10377477-B2
Application number	US-201213669212-A
Country	US
Kind code	B2
Filing date	Nov 5, 2012
Priority date	Dec 28, 2011
Publication date	Aug 13, 2019
Grant date	Aug 13, 2019

Abstract

According to one embodiment, a pitch link includes a first link, a second link coupled to a first end of the first link, a third link coupled to a second end of the first link opposite the first end, and a first bearing housing having a first bearing and a second bearing housing having a second bearing. The first bearing housing is removably coupled to the second link. The second link separates the first bearing housing from the first link. The second bearing housing is removably coupled to the third link. The third link separates the second bearing housing from the first link.

First claim

What is claimed is:

1. A rotorcraft, comprising:
a body;
a power train coupled to the body and comprising a power source and a drive shaft coupled to the power source;
a hub coupled to the drive shaft;
a rotor blade coupled to the hub;
a swashplate positioned about the drive shaft; and
a pitch link coupled between the swashplate and the hub corresponding to the rotor blade, the pitch link comprising:
a link assembly having an overall adjustable length, the link assembly comprising a first link, a second link coupled to a first end of the first link, and a third link coupled to a second end of the first link opposite the first end;
a first bearing housing comprising a first eyelet having a first bearing disposed in the first eyelet, the first bearing housing removably coupled to the second link, the second link separating the first bearing housing from the first link; and
a second bearing housing comprising a second eyelet having a second bearing disposed in the second eyelet, the second bearing housing removably coupled to the third link, the third link separating the second bearing housing from the first link;
wherein the first bearing housing is rotatable relative to the second link and wherein a first bearing housing nut is configured to selectively lock the first bearing housing in any angular orientation relative to the second link without limitation;
wherein the second bearing housing is rotatable relative to the third link and wherein a second bearing housing nut is configured to selectively lock the second bearing housing in any angular orientation relative to the third link without limitation; and
wherein each of the first link, the second link, and the third link are rod-shaped and comprise no eyelets.

2. The rotorcraft of claim 1 , further comprising:
a first jam nut coupling the first link to the second link; and
a second jam nut coupling the first link to the third link.

3. The rotorcraft of claim 2 , wherein the overall adjustable length is adjustable by adjusting at least one of the first jam nut and the second jam nut.

4. The rotorcraft of claim 1 , wherein the second link separates the first bearing housing from the first link such that removal of the first bearing housing does not alter the overall adjustable length.

5. The rotorcraft of claim 1 , wherein the first bearing housing threads into the second link.

6. A pitch link, comprising:
a link assembly having an overall adjustable length, the link assembly comprising:
a first link;
a second link coupled to a first end of the first link; and
a third link coupled to a second end of the first link opposite the first end;

a first bearing housing comprising a first eyelet having a first bearing disposed in the first eyelet, the first bearing housing removably coupled to the second link, the second link separating the first bearing housing from the first link; and
a second bearing housing comprising a second eyelet having a second bearing disposed in the second eyelet, the second bearing housing removably coupled to the third link, the third link separating the second bearing housing from the first link;
wherein the first bearing housing is rotatable relative to the second link and wherein a first bearing housing nut is configured to selectively lock the first bearing housing in any angular orientation relative to the second link without limitation;
wherein the second bearing housing is rotatable relative to the third link and wherein a second bearing housing nut is configured to selectively lock the second bearing housing in any angular orientation relative to the third link without limitation; and

wherein each of the first link, the second link, and the third link are rod-shaped and comprise no eyelets.

7. The pitch link of claim 6 , further comprising:
a first jam nut coupling the first link to the second link; and
a second jam nut coupling the first link to the third link.

8. The pitch link of claim 7 , wherein the overall adjustable length is adjustable by adjusting at least one of the first jam nut and the second jam nut.

9. The pitch link of claim 6 , wherein the second link separates the first bearing housing from the first link such that removal of the first bearing housing does not alter the overall adjustable length.

10. The pitch link of claim 6 , wherein the first bearing housing threads into the second link.

11. The pitch link of claim 10 , wherein the first bearing housing and the second link have threads.

12. The pitch link of claim 6 , wherein the first bearing is a monoball sliding element bearing.

Assignees

• Bell Helicopter Textron Inc

Inventors

• Biser Joseph
• Day Clifton B
• Stamps Frank B
• Spivey Daniel

Classifications

• F16C7/06

  Adjustable connecting-rods · CPC title

• F16C2326/43

  Aeroplanes; Helicopters · CPC title

• B64C27/605 Primary

  including swash plate, spider or cam mechanisms · CPC title

• Y10T29/4973

  Replacing of defective part · CPC title