Nut locking feature

Patent metadata

Field	Value
Publication number	US-11480212-B2
Application number	US-201916567298-A
Country	US
Kind code	B2
Filing date	Sep 11, 2019
Priority date	Sep 11, 2019
Publication date	Oct 25, 2022
Grant date	Oct 25, 2022

Abstract

An assembly comprising: a nut having a cylindrical body with a threaded external surface, an axially extending interior tool socket, and a radially outwardly extending flange at a proximal end of the cylindrical body; a first component including a hollow cylindrical tube with a connector end having a radially inwardly extending shoulder, the radially inwardly extending shoulder abutting the radially outwardly extending flange of the nut in an assembled position; and a second component including an annular hub with a threaded internal surface matching the threaded external surface of the nut, and an annular mounting surface abutting the connector end of the propeller shaft in the assembled position.

First claim

What is claimed is:

1. An assembly comprising:
a nut having a cylindrical body with a helically threaded external surface, an interior tool socket, and a radially outwardly extending flange at a proximal end of the cylindrical body, the interior tool socket extending through the cylindrical body from the proximal end to the distal end;
a first component including a hollow cylindrical tube with a connector end having a radially inwardly extending shoulder, the radially inwardly extending shoulder abutting the radially outwardly extending flange of the nut in an assembled position; and
a second component including a helically threaded internal surface matching the helically threaded external surface of the nut, and a mounting surface abutting the connector end of the first component in the assembled position;
wherein the first component is a shaft, and the second component is a planetary gear carrier.

2. The assembly according to claim 1 wherein the interior tool socket includes at least one axial groove.

3. The assembly according to claim 2 wherein the interior tool socket includes a circumferentially spaced apart plurality of axial grooves.

4. The assembly according to claim 1 further comprising:
an anti-rotation washer having an annular body with an internal tab extending radially inwardly and an external tab extending radially outwardly;
the distal end of the nut including an inward anti-rotation slot engaging the internal tab of the anti-rotation washer in the assembled position; and
the second component including an outward anti-rotation slot engaging the external tab of the anti-rotation washer in the assembled position.

5. The assembly according to claim 4 wherein the second component includes an annular washer seat recess matching the annular body of the anti-rotation washer and wherein the outward anti-rotation slot extends radially from the annular washer seat recess.

6. The assembly according to claim 5 comprising:
a washer retention ring disposed in a retention recess within the second component in the assembled position, the retention recess being axially distal relative to the annular washer seat recess.

7. The assembly according to claim 4 wherein the distal end of the nut includes a circumferentially spaced apart plurality of inward anti-rotation slots.

8. The assembly according to claim 7 wherein the second component includes a circumferentially spaced apart plurality of outward anti-rotation slots.

9. The assembly according to claim 8 wherein the anti-rotation washer includes a circumferentially spaced apart plurality of internal tabs extending radially inwardly and a circumferentially spaced apart plurality of external tabs extending radially outwardly.

10. The assembly according to claim 1 wherein:
a proximal surface of the radially inwardly extending shoulder of the first component abuts the radially outwardly extending flange of the nut in the assembled position; and wherein a distal surface of the connector end of the first component abuts the mounting surface of the second component in the assembled position.

11. The assembly according to claim 10 wherein:
the connector end of the first component includes an annular ridge; and
a proximal surface of a radially inwardly extending flange of the second component includes an annular groove.

12. A method of connecting a propeller shaft to a planetary gear carrier in a reduction gear box of a gas turbine engine, the method comprising:
inserting, into a hollow cylindrical propeller shaft, a distal end of a nut having a cylindrical body with a helically threaded external surface;
abutting a radially outwardly extending flange of the nut with a radially inwardly extending shoulder at a connector end of the propeller shaft;
engaging a torque wrench tool in an axially extending interior tool socket of the nut; and
engaging the helically threaded external surface of the nut with a helically threaded internal surface of an annular hub of a planetary gear carrier in an assembled position, the planetary gear carrier having an annular mounting surface abutting the connector end of the hollow cylindrical propeller shaft in the assembled position.

13. The method according to claim 12 comprising:
installing an anti-rotation washer into an annular washer seat recess in the planetary gear carrier, the anti-rotation washer having an annular body with an internal tab extending radially inwardly and an external tab extending radially outwardly;
engaging the internal tab of the anti-rotation washer into an inward anti-rotation slot in the distal end of the nut; and
engaging the external tab of the anti-rotation washer into an outward anti-rotation slot of the planetary gear carrier.

14. The method according to claim 13 comprising:
installing a washer retention ring in a retention recess within the planetary gear carrier.

15. A fastening system for a reduction gearbox planet carrier of a gas turbine engine, the fastening system comprising:
a nut having a cylindrical body with a threaded external surface, an axially extending interior tool socket, and a radially outwardly extending flange at a proximal end of the cylindrical body;
a propeller shaft including a hollow cylindrical tube with a connector end having a radially inwardly extending shoulder, the radially inwardly extending shoulder abutting the radially outwardly extending flange of the nut in an assembled position; and
a planetary gear carrier including an annular hub with a threaded internal surface matching the threaded external surface of the nut, and an annular mounting surface abutting the connector end of the propeller shaft in the assembled position.

16. The fastening system according to claim 15 further comprising:
an anti-rotation washer having an annular body with an internal tab extending radially inwardly and an external tab extending radially outwardly;
the distal end of the nut including an inward anti-rotation slot engaging the internal tab of the anti-rotation washer in the assembled position; and
the planetary gear carrier including an outward anti-rotation slot engaging the external tab of the anti-rotation washer in the assembled position.

17. The fastening system according to claim 16 wherein the planetary gear carrier includes an annular washer seat recess matching the annular body of the anti-rotation washer and wherein the outward anti-rotation slot extends radially from the annular washer seat recess.

18. The fastening system according to claim 17 comprising:
a washer retention ring disposed in a retention recess within the planetary gear carrier in the assembled position, the retention recess being axially distal relative the annular washer seat recess.

19. An assembly comprising:
a nut having a cylindrical body with a helically threaded external surface, an axially extending interior tool socket, and a radially outwardly extending flange at a proximal end of the cylindrical body;
a first component including a hollow cylindrical tube with a connector end having a radially inwardly extending shoulder, the radially inwardly extending shoulder abutting the radially outwardly extending flange of the nut in an assembled position; and
a second component including a helically threaded internal surface matching the helically threaded external surface of the nut, and an annular mounting surface abutting the connector end of the first component in the assembled position; and
an anti-rotation washer having an annular body with an internal tab extending radially inw

Assignees

• Pratt & Whitney Canada

Inventors

• Weaver Paul
• Wilson John
• Desjardins Michel
• Turcotte Herve

Classifications

• F01D25/246

  Fastening of diaphragms or stator-rings · CPC title

• F01D25/243

  Flange connections; Bolting arrangements (F01D25/265 takes precedence) · CPC title

• B64C11/02

  Hub construction · CPC title

• F16H1/28

  with gears having orbital motion · CPC title

• Y02T50/60

  Efficient propulsion technologies, e.g. for aircraft · CPC title