Voice coil linear activated park brake

Patent metadata

Field	Value
Publication number	US-9308990-B2
Application number	US-201414292005-A
Country	US
Kind code	B2
Filing date	May 30, 2014
Priority date	May 30, 2014
Publication date	Apr 12, 2016
Grant date	Apr 12, 2016

Abstract

A park brake systems and methods are disclosed. According to various embodiments, park brake systems comprising a tapered motor shaft having a first diameter and a second diameter, the second diameter being greater than the first diameter, a voice coil disposed at least partially around a circumference of a bobbin, a first one-way clutch housed at least partially within the bobbin, the first one-way clutch disposed coaxial to the tapered motor shaft, and an annular magnet disposed coaxial to the tapered motor shaft and proximal to the first one-way clutch, wherein, in response to a first voltage applied to the voice coil, the first one-way clutch translates axially in a first direction with respect to the tapered motor shaft and engages with the second diameter are disclosed.

First claim

What is claimed is:

1. A park brake system comprising:
a tapered motor shaft having a first diameter and a second diameter, the second diameter being greater than the first diameter;
a spring disposed at least partially around a circumference of the tapered motor shaft;
a voice coil disposed at least partially around a circumference of a bobbin comprising a ferromagnetic insert;
a first one-way clutch housed at least partially within the bobbin, the first one-way clutch disposed coaxial to the tapered motor shaft; and
an annular magnet disposed coaxial to the tapered motor shaft and proximal to the first one-way clutch;
wherein, in response to a first voltage applied to the voice coil, the first one-way clutch translates axially in a first direction with respect to the tapered motor shaft and engages with the second diameter, and
wherein, in response to a second voltage applied to the voice coil, the first one-way clutch translates axially in a second direction and is disposed about the first diameter.

2. The park brake system of claim 1 , further comprising a second one-way clutch housed at least partially within the bobbin.

3. The park brake system of claim 2 , wherein the first one-way clutch and the second one-way clutch are disposed to prevent rotation of the tapered motor shaft in response to engagement with the tapered motor shaft.

4. The park brake system of claim 1 , further comprising an annular steel ring disposed coaxial to the tapered motor shaft and proximal to the annular magnet.

5. The park brake system of claim 1 , wherein the second voltage is reversed relative to the first voltage.

6. The park brake system of claim 1 , wherein the spring exerts a distal force on the bobbin.

7. The park brake system of claim 6 , wherein, in response to the first voltage applied to the voice coil, the distal force acts in a direction opposite the first direction.

8. The park brake system of claim 1 , wherein the first one-way clutch is at least one of an HF type one-way clutch, an HFL type one-way clutch, an NCM type one-way clutch, an NHF type one-way clutch, an NCU type one-way clutch, an NCZ type one-way clutch, an NCZC type one-way clutch, an NCZX type one-way clutch, and an NCUX type one-way clutch.

9. An electromechanical actuator (“EMA”), comprising the park brake system of claim 1 .

10. A method comprising:
applying a first voltage to a voice coil disposed at least partially around a circumference of a bobbin comprising a ferromagnetic insert, wherein a first one-way clutch is housed at least partially within the bobbin, the first one-way clutch disposed coaxial to a tapered motor shaft having a first diameter and a second diameter, the second diameter being greater than the first diameter;
translating the first one-way clutch axially in a first direction with respect to the tapered motor shaft; and
engaging the first one-way clutch to the second diameter,
wherein rotation of the tapered motor shaft is prevented in a first rotational direction in response to engagement of the first one-way clutch with the tapered motor shaft.

11. The method of claim 10 , further comprising:
applying a second voltage to the voice coil;
translating the first one-way clutch axially in a second direction; and
disposing the first one-way clutch about the first diameter.

12. The method of claim 10 , further comprising a second one-way clutch housed at least partially within the bobbin.

13. The method of claim 12 , wherein the first one-way clutch and the second one-way clutch are disposed to prevent rotation of the tapered motor shaft when in an engaged state.

14. The method of claim 10 , wherein the first voltage is applied by an electromechanical actuator controller (“EMAC”).

Assignees

• Goodrich Corp

Inventors

• Drennen David B
• Rehfus Kevin
• French Robert
• Klode Harald

Classifications

• F16D2121/00

  Type of actuator operation force · CPC title

• B64C25/44 Primary

  Actuating mechanisms · CPC title

• F16D2500/7042

  Voltage · CPC title

• F16D2500/7041

  Position · CPC title

• F16D2500/1045

  Friction clutch · CPC title