Magnetic particle testing for an axle of an aircraft landing gear

Patent metadata

Field	Value
Publication number	US-12326419-B2
Application number	US-202318299585-A
Country	US
Kind code	B2
Filing date	Apr 12, 2023
Priority date	Apr 12, 2023
Publication date	Jun 10, 2025
Grant date	Jun 10, 2025

Abstract

A magnetic particle testing mechanism is provided for testing for defects in an axle of a landing gear assembly. The magnetic particle testing mechanism includes a conductor mechanism. The conductor mechanism is configured to apply a magnetic particle substance onto a portion of the axle and generate a magnetic field within or around the portion of the axle. Generating the magnetic field causes a magnetic field distortion associated with a defect in the axle that attracts the magnetic particle substance indicating a location of the defect in the axle.

First claim

What is claimed is:

1. A magnetic particle testing mechanism for testing for defects in an axle of a landing gear assembly, comprising:
a conductor mechanism, wherein the conductor mechanism is configured to:
apply a magnetic particle substance onto a portion of the axle; and
generate a magnetic field within or around the portion of the axle,

wherein generating the magnetic field causes a magnetic field distortion associated with a defect in the axle that attracts the magnetic particle substance indicating a location of the defect in the axle and wherein the conductor mechanism is a tube structure with a center void and a plurality of spray nozzles along a length of an outer casing of the tube structure.

2. The magnetic particle testing mechanism of claim 1 , wherein the conductor mechanism is a central conductor mechanism and wherein the central conductor mechanism is configured to be inserted into a bore of the axle.

3. The magnetic particle testing mechanism of claim 2 ,
wherein the central conductor mechanism is a set of central conductor mechanisms,
wherein a first central conductor mechanism of the set of central conductor mechanisms is configured to be inserted into the bore on a first end of the axle,
wherein a second central conductor mechanism of the set of central conductor mechanisms is configured to be inserted into the bore on a second end of the axle, and
wherein a first end of the first central conductor mechanism and a first end of the second central conductor mechanism are configured to couple to each other in a center of the bore of the axle.

4. The magnetic particle testing mechanism of claim 1 , wherein the conductor mechanism is a coiled conductor mechanism and wherein the coiled conductor mechanism is configured to surround an outer perimeter of the axle.

5. The magnetic particle testing mechanism of claim 1 , wherein the nozzles of the plurality of spray nozzles are positioned around an outer circumference of the outer casing.

6. The magnetic particle testing mechanism of claim 1 , wherein the tube structure forms a coil and wherein the plurality of spray nozzles are positioned along an inner circumference of a circle formed by the coil.

7. The magnetic particle testing mechanism of claim 1 , wherein each spray nozzle in the plurality of spray nozzles is either a single tip spray nozzle or a multi-tip spray nozzle and wherein the multi-tip spray nozzle includes between 2 spray tips and 6 spray tips.

8. The magnetic particle testing mechanism of claim 1 , wherein the magnetic field generated within or around the portion of the axle is provided via a set of electrical connections coupled to either end of the conductor mechanism.

9. The magnetic particle testing mechanism of claim 1 , wherein the magnetic field generated within or around the portion of the axle is via an electric current.

10. A system for testing for defects in an axle of a landing gear assembly, comprising:
a magnetic particle testing mechanism, the magnetic particle testing mechanism comprising:
an axle seat configured to receive the axle, wherein the axle seat comprises:
a base post;
a crossbar structure coupled to the base post; and
a set of “V” support structures coupled to the crossbar structure and configured to support the axle; and

a conductor mechanism, wherein the conductor mechanism is configured to:
apply a magnetic particle substance onto a portion of the axle; and
generate a magnetic field within or around the portion of the axle,

wherein generating the magnetic field causes a magnetic field distortion associated with a defect in the axle that attracts the magnetic particle substance indicating a location of the defect in the axle.

11. The system of claim 10 , wherein the magnetic particle testing mechanism further comprises:
a head stock,
wherein the conductor mechanism is a central conductor mechanism,
wherein the head stock is configured to support the central conductor mechanism, and
wherein the central conductor mechanism is configured to be inserted into a bore of the axle by translating the head stock in a first direction.

12. The system of claim 11 , wherein the magnetic particle testing mechanism further comprises:
a tail stock,
wherein the central conductor mechanism is a set of central conductor mechanisms,
wherein the head stock is configured to support a first central conductor mechanism of the set of central conductor mechanisms,
wherein the first central conductor mechanism is configured to be inserted into the bore on a first end of the axle by translating the head stock in the first direction,
wherein the tail stock is configured to support a second central conductor mechanism of the set of central conductor mechanisms,
wherein the second central conductor mechanism is configured to be inserted into the bore on a second end of the axle by translating the tail stock in a second direction opposite the first direction, and
wherein a first end of the first central conductor mechanism and a first end of the second central conductor mechanism are configured to couple to each other in a center of the bore of the axle.

13. The system of claim 10 , wherein the magnetic particle testing mechanism further comprises:
a first movable member,
wherein the conductor mechanism is a coiled conductor mechanism,
wherein the first movable member is configured to support the coiled conductor mechanism, and
wherein the coiled conductor mechanism is configured surround an outer perimeter of the axle.

14. The system of claim 13 , wherein the magnetic particle testing mechanism further comprises:
a second movable member,
wherein the coiled conductor mechanism is a set of coiled conductor mechanisms,
wherein the first movable member is configured to support a first coiled conductor mechanism in the set of coiled conductor mechanisms,
wherein the first coiled conductor mechanism is configured surround the outer perimeter of the axle and translate in a longitudinal direction from a first end of the axle to substantially a center of the axle,
wherein the second movable member is configured to support a second coiled conductor mechanism in the set of coiled conductor mechanisms, and
wherein the second coiled conductor mechanism is configured surround the outer perimeter of the axle and translate in the longitudinal direction from a second end of the axle to substantially the center of the axle.

15. The system of claim 10 , wherein the axle seat is configured to swivel about a central axis in a lateral direction of the axle seat of between 0 degrees and 60 degrees.

16. The system of claim 10 , wherein the axle seat is configured to tilt in a longitudinal direction between 1 and 10 degrees.

17. The system of claim 10 , wherein the crossbar structure is configured to tilt with respect to the base post in order to tilt the axle.

18. The system of claim 17 , wherein a first “V” support structure of the set “V” support structures is configured to be positioned lower than a second “V” support structure of the set of “V” support structures in order to tilt the axle.

Assignees

• Goodrich Corp

Inventors

• Lee Seokwon

Classifications

• B64F5/60

  Testing or inspecting aircraft components or systems · CPC title

• B64C25/00

  Alighting gear (air-cushion alighting gear B60V3/08) · CPC title

• G01N27/84 Primary

  by applying magnetic powder or magnetic ink · CPC title