Active vibration controller

Patent metadata

Field	Value
Publication number	US-10161467-B2
Application number	US-201715589304-A
Country	US
Kind code	B2
Filing date	May 8, 2017
Priority date	May 11, 2016
Publication date	Dec 25, 2018
Grant date	Dec 25, 2018

Abstract

An active vibration controller includes: a housing; a first magnetic member installed on the side of the housing having a toric shape; a movable member including a second magnetic member that is substantially coaxial with the first magnetic member and disposed inside the toric shape of the first magnetic member; an exciting coil that generates a magnetic field in accordance with an intensity of a current supplied thereto; and a magnetic viscoelastic elastomer that has a magnetic viscoelastic property varying in accordance with a magnitude of the magnetic field from the exciting coil between the first and second tip portions, and connects the first magnetic core to the second magnetic core. The magnetic viscoelastic elastomer has a region having a non-magnetic property between the first and the second magnetic cores.

First claim

The invention claimed is:

1. An active vibration controller comprising:
a housing;
a first magnetic member having a toric shape, the first magnetic member installed on a side of the housing;
a movable member including a second magnetic member that is substantially coaxial with the first magnetic member and disposed inside the first magnetic member;
an exciting coil that generates a magnetic field in accordance with an intensity of a current supplied thereto, wherein the exciting coil generates the magnetic field along a circumferential direction; and
a magnetic viscoelastic elastomer that has a magnetic viscoelastic property varying in accordance with a magnitude of the magnetic field generated by the exciting coil between a first extending part of the first magnetic member and a second extending part of the second magnetic member, and connects the first extending part of the first magnetic member to the second extending part of the second magnetic member,
wherein a region having a non-magnetic property is defined within the magnetic viscoelastic elastomer between the first and the second magnetic members to concentrate magnetic flux of the magnetic field in the magnetic viscoelastic elastomer,
wherein the magnetic viscoelastic elastomer has a cross sectional area orthogonal with a direction or an opposite direction in which the magnetic flux transmits through the magnetic viscoelastic elastomer, the cross sectional area becoming smaller in the direction or the opposite direction.

2. The active vibration controller as claimed in claim 1 , wherein the region is a gap in the magnetic viscoelastic elastomer.

3. The active vibration controller as claimed in claim 1 , wherein the first magnetic member includes, at a part thereof joined to the magnetic viscoelastic elastomer, a protruding portion protruding toward the magnetic viscoelastic elastomer.

4. The active vibration controller as claimed in claim 1 , wherein the second magnetic member includes, at a part thereof joined to the magnetic viscoelastic elastomer, a protruding portion protruding toward the magnetic viscoelastic elastomer.

5. The active vibration controller as claimed in claim 2 , wherein the first magnetic member includes, at a part thereof joined to the magnetic viscoelastic elastomer, a protruding portion protruding toward the magnetic viscoelastic elastomer.

6. The active vibration controller as claimed in claim 2 , wherein the second magnetic member includes, at a part thereof joined to the magnetic viscoelastic elastomer, a protruding portion protruding toward the magnetic viscoelastic elastomer.

7. The active vibration controller as claimed in claim 1 , wherein the exciting coil generates the magnetic field in the second magnetic member in an axial direction of the first magnetic member.

Assignees

• Honda Motor Co Ltd

Inventors

• Terashima Osamu
• Inoue Toshio

Classifications

• F16F15/03

  using {magnetic or} electromagnetic means (F16F9/53, {F16F15/005} take precedence) · CPC title

• F16F6/00

  Magnetic springs {(magnetic spring arrangements for the suppression of vibration in systems F16F15/03)}; Fluid magnetic springs {, i.e. magnetic spring combined with a fluid} · CPC title

• F16F1/361

  comprising magneto-rheological elastomers [MR], (magneto-rheological fluid dampers F16F9/535) · CPC title

• F16F1/3615 Primary

  with means for modifying the spring characteristic (F16F1/371 takes precedence) · CPC title