Vibration isolation system

• US 8,882,091 B2
• Filed: 11/11/2011
• Issued: 11/11/2014
• Est. Priority Date: 11/11/2011
• Status: Active Grant

• Current Assignee: Textron Innovations Incorporated (Textron Inc)
• Original Assignee: Textron Innovations Incorporated (Textron Inc)
• Inventors: Lee, Taeoh, Smith, Michael R., Stamps, Frank B., Heverly, David E. Jr.
• Primary Examiner(s): Rodriguez, Pamela
• Application Number:
  US13/294,230
• Publication Number:
  US 20130119591A1
• Time in Patent Office: 1,096 Days
• Field of Search: 267/140.14, 267/35, 267/140.11, 267/140.15, 188/275, 188/298, 188/317, 188/322.15, 188/322.18, 188/322.22, 188/156, 188/158, 188/161, 188/162, 244/54, 248/562, 248/636
• US Class Current: 267/140.14
• CPC Class Codes: B64C 2027/002 mounted between the rotor drive and the fuselage
• CPC Class Codes: F16F 13/24 the central part of the unit being supported by one element and both extremities of the unit being supported by a single other element, i.e. double acting mounting

Abstract

A vibration isolator includes a housing having an upper fluid chamber, a lower fluid chamber, a piston, a tuning passage, and a linear inductance motor assembly for changing the isolation frequency of the vibration isolator. The piston is resiliently disposed within the housing. A vibration tuning fluid is located in the upper fluid chamber, the lower fluid chamber, and the tuning passage. The linear inductance motor assembly includes a magnet member and an inductance coil at least partially surrounding the magnet member. A control system is configured to selectively actuate the magnet member; wherein selective actuation of the magnet member selectively imparts a pumping force on the tuning fluid, thereby changing the isolation frequency.

Claims

1. A vibration isolator, comprising:

a housing having an upper fluid chamber and a lower fluid chamber;

a tuning passage;

a tuning fluid disposed within the tuning passage, the upper fluid chamber, and the lower fluid chamber;

a primary piston resiliently disposed within the housing;

an upper pumper piston and a lower pumper piston, the upper pumper piston and the lower pumper piston being coupled to the primary piston, the upper pumper piston and lower pumper piston defining the tuning passage;

a linear inductance motor assembly comprising;

a magnet member coupled between the upper pumper piston and the lower pumper piston;

an inductance coil at least partially surrounding the magnet member; and

a control system configured to selectively actuate the magnet member, wherein selective actuation of the magnet member selectively imparts a force upon the upper pumper piston and the lower pumper piston; and

wherein a length of the tuning passage is defined by the magnet.

2. The vibration isolator according to claim 1, wherein the upper pumper piston and the lower pumper piston are each coupled to the primary piston with at least one elastomer member.

3. The vibration isolator according to claim 1, wherein the upper pumper piston and the lower pumper piston are each conical shaped.

4. The vibration isolator according to claim 1, wherein the inductance coil is configured to translate the magnet relative to the inductance coil.

5. The vibration isolator according to claim 1, wherein the linear inductance motor assembly is configured to selectively contribute to the amount of volume of the tuning fluid pumped through the tuning passage during an actuation of the primary piston.

6. The vibration isolator according to claim 1, wherein the inductance coil is partially embedded in the primary piston.

7. A vibration isolator, comprising:

a housing having an upper fluid chamber and a lower fluid chamber;

a tuning passage;

a tuning fluid disposed within the tuning passage, the upper fluid chamber, and the lower fluid chamber;

a piston resiliently disposed within the housing;

a pumper piston defining the tuning passage

a linear inductance motor assembly comprising;

a magnet member configured to translate relative to the piston, the magnet member unobstructing the flow of fluid through the tuning passage;

an inductance coil at least partially surrounding the magnet member; and

a control system configured to selectively actuate the magnet member;

wherein selective actuation of the magnet member selectively imparts a pumping force on the tuning fluid; and

wherein the tuning passage is at least partially defined by the magnet.

8. The vibration isolator according to claim 7, wherein the magnet member has end portions that form a piston, such that a displacement of the magnet member relative to the piston acts to accelerate the tuning fluid in the opposite direction of the displacement of the magnet member.

9. The vibration isolator according to claim 7, wherein the magnet member is configured to slidingly translate relative to the piston.

10. The vibration isolator according to claim 7, wherein the inductance coil is configured to translate the magnet relative to the inductance coil.

11. The vibration isolator according to claim 7, wherein the linear inductance motor assembly is configured to selectively contribute to the amount of volume of the tuning fluid pumped through the tuning passage during an actuation of the piston.

12. The vibration isolator according to claim 7, wherein the inductance coil is at least partially embedded in the piston.

13. The vibration isolator according to claim 7, wherein the magnet member is located in an internal piston passage, the internal piston passage being a port located through the piston, internal piston passage being separate from the tuning passage.

14. The vibration isolator according to claim 13, wherein the inductance coil at least partially surrounds the internal piston passage.