Aircraft landing gear

Patent metadata

Field	Value
Publication number	US-10837823-B2
Application number	US-201815887859-A
Country	US
Kind code	B2
Filing date	Feb 2, 2018
Priority date	Feb 3, 2017
Publication date	Nov 17, 2020
Grant date	Nov 17, 2020

Abstract

An aircraft undercarriage has an axle for carrying at least one wheel. The undercarriage further includes a magnetic measurement target and at least one magnetic movement sensor cooperating with the magnetic measurement target to measure bending of the axle. The magnetic measurement target has a body that extends inside the axle and includes a fastener end fastened to one end of the axle. The body also include a target surface that extends over an inside surface of the body. The magnetic movement sensor is positioned inside the axle to measure movement of the target surface.

First claim

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:

1. An aircraft undercarriage, comprising:
an axle configured to carry at least one wheel; and
a magnetic measurement target; and
at least one magnetic movement sensor cooperating with the magnetic measurement target to measure bending of the axle, wherein the magnetic measurement target includes a body that extends inside the axle, the body including a fastener end fastened to one end of the axle and a target surface that extends over an inside surface of the body, the magnetic movement sensor being positioned inside the axle to measure movement of the target surface.

2. The aircraft undercarriage according to claim 1 , wherein the magnetic movement sensor is positioned inside a central portion of the axle.

3. The aircraft undercarriage according to claim 2 , wherein the magnetic movement sensor is mounted on a support fastened to the central portion of the axle, the support extending through an opening formed in the central portion of the axle.

4. The aircraft undercarriage according to claim 1 , wherein the body has a main portion in the form of a portion of a hollow cylinder.

5. The aircraft undercarriage according to claim 1 , wherein a slot is formed in the body in an axial direction, the slot separating two longitudinal portions of the body, each longitudinal portion of the body presenting a target surface that extends over an inside surface of the longitudinal portion of the body.

6. The aircraft undercarriage according to claim 5 , further comprising two magnetic movement sensors, each magnetic movement sensor being positioned inside the axle and being configured to measure movement of one of the two target surfaces.

7. The aircraft undercarriage according to claim 1 , wherein the magnetic movement sensor is a Linear Variable Differential Transformer sensor.

8. The aircraft undercarriage according to claim 7 , wherein the Linear Variable Differential Transformer sensor includes a feeler configured to contact the target surface.

9. The aircraft undercarriage according to claim 1 , further comprising a securement assembly configured to secure the fastener end of the body of the magnetic measurement target to the end of the axle without backlash.

10. The aircraft undercarriage according to claim 9 , wherein the securement assembly comprises a nut screwed onto the fastener end of the body and inserted in part inside the axle.

11. The aircraft undercarriage according to claim 9 , wherein the securement assembly includes a ring mounted around the fastener end of the body and positioned in part in a groove formed in an inside surface of the axle.

12. The aircraft undercarriage according to claim 1 , further comprising:
two magnetic measurement targets, each magnetic measurement target being positioned in a respective half of the axle; and
a plurality of magnetic movement sensors, each magnetic movement sensor cooperating with the two magnetic measurement targets.

Assignees

• Safran Landing Systems

Inventors

• Henrion Philippe
• Collet Olivier

Classifications

• B64C25/001 Primary

  Devices not provided for in the groups B64C25/02 - B64C25/68 · CPC title

• B64D45/00

  Aircraft indicators or protectors not otherwise provided for · CPC title

• G01G19/07

  for weighing aircraft · CPC title

• G01G7/02

  by electromagnetic action · CPC title

• G01G3/15

  measuring variations of magnetic properties · CPC title