Aircraft component rotary device

Patent metadata

Field	Value
Publication number	US-9616990-B2
Application number	US-201414486443-A
Country	US
Kind code	B2
Filing date	Sep 15, 2014
Priority date	Jul 18, 2014
Publication date	Apr 11, 2017
Grant date	Apr 11, 2017

Abstract

A rotary device assembly is provided and includes an input shaft coupled to a torque generating device, an output shaft and a rotary device disposed to transmit first torque from the input shaft to the output shaft and configured with no-back capability to prevent second torque applied to the output shaft from being transmitted to the input shaft in an event the second torque deceeds a torque-limiting threshold and the no-back capability and torsional lock-up capability to prevent an overload of the torque generating device in an event the second torque exceeds the torque-limiting threshold.

First claim

The invention claimed is:

1. A rotary device assembly, comprising:
an input shaft coupled to a torque generating device;
an output shaft; and
a rotary device comprising:
an output portion with a skewed roller assembly loaded by pre-load springs and a ball ramp assembly such that the skewed roller assembly provides variable drag torques which are variable based on the loads of the pre-load springs

and the ball ramp assembly; and
an input portion comprising a thrust plate rotatable with the input shaft and having a dimple defining first axial surface, an output cone shaft rotatable with the output shaft and having a ramp defining second axial surface complementary to the first axial surface and spherical balls disposable in the dimples and the ramps by which the first torque is transmittable from the input shaft to the output shaft,
the spherical balls being drivable out of the ramps in the event the second torque exceeds a torque-limiting threshold, and
the rotary device being disposed to transmit first torque from the input shaft to the output shaft and configured with:
no-back capability to prevent second torque applied to the output shaft from being transmitted to the input shaft in an event the second torque deceeds the torque-limiting threshold, and
the no-back capability and torsional lock-up capability to prevent an overload of the torque generating device in an event the second torque exceeds the torque-limiting threshold, the rotary device further comprising an elastic element by which the output cone shaft is coupled to the output shaft, the elastic element being pre-loaded to prevent engagement of the torsional lock-up capability in the event the second torque deceeds the torque-limiting threshold.

2. The rotary device assembly according to claim 1 , wherein the torque generating device comprises a flight control actuation system.

3. The rotary device assembly according to claim 1 , further comprising:
a first support housing;
bearing elements by which the input shaft is rotatably disposed in the support housing; and
a second support housing to which the rotary device is anchored.

4. A rotary device assembly, comprising:
an input shaft coupled to a torque generating device;
an output shaft; and
a rotary device comprising:
an output portion with a skewed roller assembly loaded by pre-load springs and a ball ramp assembly such that the skewed roller assembly provides variable drag torques which are variable based on the loads of the pre-load springs and the ball

ramp assembly; and
an input portion comprising a thrust plate rotatable with the input shaft and having a dimple defining first axial surface, an output cone shaft rotatable with the output shaft and having a ramp defining second axial surface complementary to the first axial surface and spherical balls disposable in the dimples and the ramps by which the first torque is transmittable from the input shaft to the output shaft, the spherical balls being drivable out of the ramps in the event the second

torque exceeds a torque-limiting threshold,
the rotary device being disposed to transmit first torque from the input shaft to the output shaft and configured with:
no-back capability to prevent second torque applied to the output shaft from being transmitted to the input shaft in an event the second torque deceeds the torque-limiting threshold, and
the no-back capability and torsional lock-up capability to prevent an overload of the torque generating device in an event the second torque exceeds the torque-limiting threshold, wherein the output cone shaft comprises a dynamic cone portion and the rotary device comprises an output portion comprising:
a first torque pathway, which is activated in the event the second torque deceeds the torque-limiting threshold, by which the second torque is directed away from the input shaft; and
a second torque pathway including a static cone portion, which is activated in the event the second torque exceeds the torque-limiting threshold, by which the second torque is directed away from the input shaft and added to a torque gain generated by engagement between the dynamic cone portion and the static cone portion.

5. A rotary device assembly, comprising:
an input shaft coupled to a torque generating device;
an output shaft; and
a rotary device disposed to transmit first torque from the input shaft to the output shaft, the rotary device comprising an input portion comprising a thrust plate rotatable with the input shaft and having a dimple defining first axial surface, an output cone shaft rotatable with the output shaft and having a ramp defining second axial surface complementary to the first axial surface and spherical balls disposable in the dimples and the ramps by which the first torque is transmittable from the input shaft to the output shaft, the spherical balls being drivable out of the ramps in the event the second torque exceeds a torque-limiting threshold,
wherein the output cone shaft comprises a dynamic cone portion and the rotary device comprises an output portion comprising a first torque pathway, which is activated in the event the second torque deceeds the torque-limiting threshold, by which the second torque is directed away from the input shaft and a second torque pathway including a static cone portion, which is activated in the event the second torque exceeds the torque-limiting threshold, by which the second torque is directed away from the input shaft and added to a torque gain generated by engagement between the dynamic cone portion and the static cone portion,
the rotary device being configured with:
no-back capability to prevent second torque applied to the output shaft from being transmitted to the input shaft in an event the second torque deceeds a torque-limiting threshold, and
the no-back capability and torsional lock-up capability to prevent an overload of the torque generating device in an event the second torque exceeds the torque-limiting threshold,
wherein the output portion further comprises:
a skewed roller assembly operably disposed between the thrust plate and a support housing; and
a pre-loaded skewed roller assembly operably disposed between the static cone portion and the thrust plate such that the skewed roller assembly is loaded by two independent means, one by the pre-load springs and the other by the ball ramp assembly such that the skewed roller

assembly can provide drag torques that are variable based on the loads created by the pre-load springs and the ball ramp assembly.

6. The rotary device assembly according to claim 1 , wherein the no-back capability is independently pre-loaded.

7. A flight control actuation system, comprising:
a static surface;
a dynamic surface, which is pivotable relative to the static surface; and
a rotary device assembly comprising an output portion with a skewed roller assembly loaded by pre-load springs and a ball ramp assembly such that the skewed roller assembly provides variable drag torques which are variable based on the loads of the pre-load springs and the ball ramp assembly,
the rotary device assembly being operably coupled to the static and dynamic surfaces and configured to transmit first torque from an input shaft to an output shaft to control a pivoting of the dynamic surface with:
an independently pre-loaded no-back capability to prevent second torque applied to the output shaft from being transmitted to the input shaft in an event the second torque deceeds a torque-limiting threshold, and
the no-back capability and torsional lock-up capability to prevent an overload of a torque generating device to which the input shaft is coupled in an event the second torque exceeds the torque-limiting threshold,
wherein the rotary d

Assignees

• Hamilton Sundstrand Corp

Inventors

• Barger Victor

Classifications

• B64C13/28

  mechanical · CPC title

• F16H13/04

  with balls or with rollers acting in a similar manner · CPC title

• F16D65/18

  adapted for drawing members together {, e.g. for disc brakes} · CPC title

• B64C13/32

  using cam mechanisms · CPC title

• F16D59/00

  Self-acting brakes, e.g. coming into operation at a predetermined speed · CPC title