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Dynamic vibration absorber and dynamic vibration absorbing apparatus using the same

  • US 8,714,324 B2
  • Filed: 04/20/2004
  • Issued: 05/06/2014
  • Est. Priority Date: 07/11/2003
  • Status: Active Grant
First Claim
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1. A dynamic vibration absorber comprising:

  • a weight;

    a frame body which is fixed to a floor portion of a structure and which surrounds said weight;

    a plurality of vertically mounted U-shaped leaf springs which are interposed between said frame body and said weight in a direction perpendicular to a vertical direction so as to hold said weight with respect to said frame body movably with respect to all the directions in a plane and substantially immovably in the vertical direction perpendicular to the plane and so as to determine a natural frequency for the weight; and

    a damping mechanism configured to substantially diminish progressively the vibration of said weight in the plane, said plurality of leaf springs each having a concave surface,wherein said frame body consists of a pair of X-direction vertical wall plates opposed to each other in an X direction in the plane with said weight disposed therebetween and a pair of Y-direction vertical wall plates opposed to each other in a Y direction which is perpendicular to the X direction in the plane with said weight disposed therebetween, said X-direction vertical wall plates and said Y-direction vertical wall plates each extending in vertical direction,wherein at least a first two of said leaf springs are interposed between one of said pair of X-direction vertical wall plates and said weight in the X direction, and are opposed to each other in the Y direction, such that edge portions thereof extending in the vertical direction are secured to said one X-direction vertical wall plate, respectively, other edge portions thereof extending in the vertical direction are secured to said weight, respectively, and said concave surface of one of said at least first two of said leaf springs faces said concave surface of another one of said at least first two of said leaf springs,wherein said pair of X-direction vertical wall plates are united with said pair of Y-direction vertical wall plates, respectively,wherein at least a second two of said leaf springs are interposed between another one of said pair of X-direction vertical wall plates and said weight in the X direction, and are opposed to each other in the Y direction, such that edge portions thereof extending in the vertical direction are secured to said other X-direction vertical wall plate, respectively, other edge portions thereof extending in the vertical direction are secured to said weight, respectively, and said concave surface of one of said at least second two of said leaf springs faces said concave surface of another one of said at least second two of said leaf springs,wherein at least a third two of said leaf springs are interposed between one of said pair of Y-direction vertical wall plates and said weight in the Y direction, and are opposed to each other in the X direction, such that edge portions thereof extending in the vertical direction are secured to said one Y-direction vertical wall plates, respectively, other edge portions thereof extending in the vertical direction are secured to said weight, respectively, and said concave surface of one of said at least third two of said leaf springs faces said concave surface of another one of said at least third two of said leaf springs,wherein at least a fourth two of said leaf springs are interposed between another one of said pair of Y-direction vertical wall plates and said weight in the Y direction, and are opposed to each other in the X direction, such that edge portions thereof extending in the vertical direction are secured to said other Y-direction vertical wall plates, respectively, other edge portions thereof extending in the vertical direction are secured to said weight, respectively, and said concave surface of one of said at least fourth two of said leaf springs faces said concave surface of another one of said at least fourth two of said leaf springs,wherein said weight is held movably with respect to all the directions in the plane and substantially immovably in the vertical direction perpendicular to the plane with respect to the floor portion by means of said pair of X-direction vertical wall plates and said pair of Y-direction vertical wall plates of said frame body and by means of said at least first two, said at least second two, said at least third two and said at least fourth two of said leaf springs, andwherein the damping mechanism consists of;

    a first magnetic field generating body which is fixed to one of said weight and said one of said pair of X-direction vertical wall plates, which is disposed in a first surrounded space surrounded and defined by said concave surfaces of said at least first two of said leaf springs, said weight and said one of said pair of X-direction vertical wall plates, and which generates a magnetic field, and a first plate-shaped electric conductor which is fixed to another one of said weight and said one of said pair of X-direction vertical wall plates, which is disposed in said first surrounded space, and which generates an eddy current by its relative movement with respect to said first magnetic field generating body,a second magnetic field generating body which is fixed to one of said weight and said other of said pair of X-direction vertical wall plates, which is disposed in a second surrounded space surrounded and defined by said concave surfaces of said at least second two of said leaf springs, said weight and said other of said pair of X-direction vertical wall plates, and which generates a magnetic field, and a second plate-shaped electric conductor which is fixed to another one of said weight and said other of said pair of X-direction vertical wall plates, which is disposed in said second surrounded space, and which generates an eddy current by its relative movement with respect to said second magnetic field generating body,a third magnetic field generating body which is fixed to one of said weight and said one of said pair of Y-direction vertical wall plates, which is disposed in a third surrounded space surrounded and defined by said concave surfaces of said at least third two of said leaf springs, said weight and said one of said pair of Y-direction vertical wall plates, and which generates a magnetic field, and a third plate-shaped electric conductor which is fixed to another one of said weight and said one of said pair of Y-direction vertical wall plates, which is disposed in said third surrounded space, and which generates an eddy current by its relative movement with respect to said third magnetic field generating body, anda fourth magnetic field generating body which is fixed to one of said weight and said other of said pair of Y-direction vertical wall plates, which is disposed in a fourth surrounded space surrounded and defined by said concave surfaces of said at least fourth two of said leaf springs, said weight and said other of said pair of Y-direction vertical wall plates, and which generates a magnetic field, and a fourth plate-shaped electric conductor which is fixed to another one of said weight and said other of said pair of Y-direction vertical wall plates, which is disposed in said fourth surrounded space, and which generates an eddy current by its relative movement with respect to said fourth magnetic field generating body.

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