No-back arrangement

Patent metadata

Field	Value
Publication number	US-9394980-B2
Application number	US-89352410-A
Country	US
Kind code	B2
Filing date	Sep 29, 2010
Priority date	Sep 29, 2009
Publication date	Jul 19, 2016
Grant date	Jul 19, 2016

Abstract

A no-back arrangement is disclosed for use in applying a braking load to a rotary actuator member, the no-back arrangement comprising a no-back device operable to apply a braking load to the rotary actuator member when the rotary actuator member is subject to a tensile loading, and limit means operable to limit the magnitude of the applied braking load.

First claim

The invention claimed is:

1. A no-back arrangement for use in applying a braking load to a rotary actuator member, the no-back arrangement comprising:
a no-back device operable to apply a braking load to the rotary actuator member when the rotary actuator member is subject to a tensile loading, the no-back device being operable to increase the braking load with increasing tensile loading, wherein the no-back device comprises a friction disk resiliently compressed against a no-back disk by a spring arrangement compressed by longitudinal movement of the rotary actuator member, the no-back disk allowing for rotation in only one direction when member is deployed; and
limit means operable to limit the magnitude of the applied braking load, the limit means being operable to limit the compression of the spring arrangement, the limit corresponding to a selected tensile loading, and allow rotation of the rotary actuator arising from tensile loading greater than the selected tensile loading.

2. An arrangement according to claim 1 , further comprising means for resisting movement of the actuator member under overload conditions.

3. An arrangement according to claim 2 , wherein the means for resisting comprises a control arrangement for controlling the operation of an associated motor.

4. An arrangement according to claim 2 , wherein the means for resisting comprises a mechanical load limiter.

5. An arrangement according to claim 1 , wherein the spring arrangement comprises a disc spring pack.

6. An arrangement according to claim 1 , wherein the limit means comprises a shoulder provided on the actuator member co-operable with an abutment after limited longitudinal movement of the actuator member has taken place.

7. An arrangement according to claim 6 , wherein the shoulder is provided upon a component mounted upon the actuator member.

8. An arrangement according to claim 6 , wherein the abutment is associated with a load limiter device operable to resist rotation of the actuator member in the event of further longitudinal movement of the actuator member.

9. An arrangement according to claim 6 , wherein the shoulder is integral with the actuator member.

10. An actuator comprising a rotary actuator member and a no-back arrangement operable to apply a braking load to a rotary actuator member when the rotary actuator member is subject to a tensile load, the no-back arrangement comprising:
a no-back device operable to apply a braking load to the rotary actuator member when the rotary actuator member is subject to a tensile loading, the no-back device being operable to increase the braking load with increasing tensile loading, wherein the no-back device comprises a friction disc resiliently compressed against a no-back disc by a spring arrangement compressed by longitudinal movement of the rotary actuator member, the no-back disk allowing for rotation in only one direction when member is deployed; and
limit means operable to limit the magnitude of the applied braking load, the limit means being operable to limit the compression of the spring arrangement the limit corresponding to a selected tensile loading, and allow rotation of the rotary actuator arising from tensile loading greater than the selected tensile loading.

Assignees

• Jones Tony
• Somerfield Michael Paul
• Hill Edward George
• Goodrich Actuation Systems Ltd

Inventors

• Jones Tony
• Somerfield Michael Paul
• Hill Edward George

Classifications

• F16H25/2454 Primary

  Brakes; Rotational locks · CPC title

• F16D67/02

  Clutch-brake combinations · CPC title

• F16D2125/38

  with plural cam or ball-ramp mechanisms arranged concentrically with the brake rotor axis · CPC title