JP6594764B2 - Variable inertia mass damping device - Google Patents

Description

  The present invention relates to a vibration damping device that uses an inertial mass to reduce relative vibration in the approaching / separating direction generated between two members, for example.

  As described in Patent Document 1, a rotary inertia mass type vibration damping device converts linear vibration between two members into a rotational motion with a ball screw and a ball nut screwed to the ball screw, and is integrated with the ball screw. The coupled inertial body is rotated to suppress vibration between the two members to be controlled by the inertial moment of the inertial body.

Japanese Unexamined Patent Publication No. 7-259909

  An object of the present invention is to provide a vibration damping device capable of effectively damping vibration by changing the moment of inertia of an inertial body according to the speed of vibration between two members.

  In order to solve the above-described problem, in the present invention, the linear relative movement between the two members fixed as a vibration target and the other member as a vibration control object is rotated. A motion conversion mechanism for conversion, a rotary shaft member 6 rotatably supported in the casing 2 so as to rotate together with the motion conversion mechanism, and the rotary shaft member 6 are engaged with each other by the inertia moment. An inertial mass type damping device 1 that includes an inertial body 7 that imparts rotational resistance and that suppresses vibration by converting the inertial moment of the inertial body into an inertial mass by a motion conversion mechanism is configured. The casing 2 includes an electromagnet 8 that forms a magnetic field M using the rotating shaft member 6 and the inertial body 7 as part of a magnetic circuit. The inertial body 7 is supported in the casing 2 so as to be relatively rotatable coaxially with the rotating shaft member 6, forms a sealed region 11 between the rotating shaft member 6, and applies viscosity to the sealed region 11 by applying a magnetic field M. The magnetorheological fluid 12 in which the temperature changes is enclosed. A magnetic field M across the sealed region 11 is applied by the electromagnet 8 to increase the viscosity hardness in the relative rotation with respect to the magnetorheological fluid 12 between the rotating shaft member 6 and the inertial body 7, so that the inertial body 7 is integrated with the rotating shaft member 6. Rotate.

  The vibration damping device of the present invention forms a magnetic field across the sealed region by energizing the electromagnet, increases the viscosity hardness of the magnetorheological fluid in the sealed region, rotates the inertial body integrally with the rotary shaft member, A large moment of inertia can be added, and the large inertial mass converted by the motion conversion mechanism can suppress vibration. If a plurality of vibration control devices are provided in series, the inertial mass can be adjusted according to the speed of vibration, and vibration can be effectively suppressed.

1 is a cross-sectional view of a vibration damping device according to a first embodiment of the present invention. It is sectional drawing to which a part of vibration damping device of FIG. 1 was expanded. It is sectional drawing of the damping device which concerns on 2nd Embodiment of this invention. FIG. 4 is an enlarged cross-sectional view of a part of the vibration damping device of FIG. 3. It is sectional drawing of the damping device which concerns on 3rd Embodiment of this invention. It is sectional drawing of the damping device which concerns on 4th Embodiment of this invention.

Embodiments of the present invention will be described with reference to the drawings.
In FIG. 1, a variable inertia mass damping device 1 according to the present invention is connected to a casing 2 fixed to one member that is a damping target via a connection portion 2a and to the other member that is a damping target. And a sleeve 3 fixed via the portion 3a.

  The casing 2 includes a large-diameter cylinder 2b and a small-diameter cylinder 2c that are coaxially coupled. The large-diameter cylinder 2b is closed with an end wall 2d on one end side, and communicates with the small-diameter cylinder 2c on the other end side. The connecting portion 2a is fixed to the outside of the end wall 2d.

  A ball screw 4 is provided in the small-diameter cylinder 2c of the casing 2 so as to penetrate the shaft center thereof. The ball screw 4 is supported by the casing 2 so as to be rotatable about an axis and not movable in the axial direction.

  The sleeve 3 has a cylindrical shape, and one end thereof is inserted into the small-diameter cylinder 2c so as to be able to advance and retract in the axial direction and not to rotate around the axis.

  A ball nut 5 screwed into the ball screw 4 is fixed to one end of the sleeve 3 inserted into the small diameter cylinder 2c. The ball screw 4 extends through the ball nut 5 along the axis of the sleeve 3. The ball nut 5 converts the relative movement in the axial direction between the casing 2 and the sleeve 3 due to the vibration between the two members to be controlled, into the rotational motion of the ball screw 4.

  The ball screw 4 is coaxially coupled to a rotary shaft member 6 that extends along the axis and is rotatably supported at both ends of the large cylinder 2b.

  Around the rotary shaft member 6, an inertia body 7 is rotatably supported at both ends of the large-diameter cylinder 2b with a gap from the rotary shaft member 6. As shown in FIG. 2, the inertia body 7 has wheel portions 7 a made of a nonmagnetic material and yoke portions 7 b made of a soft magnetic material alternately arranged and fixed in the axial direction.

  A substantially cylindrical electromagnet 8 is fixed to the inner wall of the large-diameter cylinder 2b. In the electromagnet 8, a plurality of coils 8b and yokes 8c are alternately fixed in the axial direction in a magnet casing 8a made of a substantially cylindrical soft magnetic material. The yoke 8c is disposed to face the yoke portion 7b of the inertial body 7. The magnet casing 8a is fitted and fixed to the inner wall of the large diameter cylinder 2b. Between the large-diameter cylinder 2b and the rotating shaft member 6, sealing materials 9 and 10 for rotation are interposed, respectively. As a result, a sealed region 11 is formed between the rotating shaft member 6 and the inertial body 7. The sealed region 11 is filled with a magnetorheological fluid 12.

  As shown in FIG. 2, the electromagnet 8 forms a magnetic field M that crosses the sealed region 11 in the direction orthogonal to the axis by using the large-diameter cylinder 2 b, the inertial body 7, and the rotary shaft member 6 as a magnetic circuit when the coil 8 b is energized. The viscous viscosity of the magnetorheological fluid 12 in the sealed region 11 is increased by the magnetic field M applied by the electromagnet 8. A resistance such as a frictional force larger than usual is generated with respect to the relative rotation between the rotating shaft member 6 and the inertial body 7 via the magnetorheological fluid 12, and the rotation is substantially transmitted to the inertial body 7, so that the rotation shaft A large moment of inertia obtained by adding that of the inertial body 7 to the moment of inertia of the member 6 is obtained. On the other hand, when the magnetic field M is turned off by turning off the current from the state of a large moment of inertia in which a current is passed through the coil 8 b, the viscosity of the magnetorheological fluid 12 is restored and the rotating shaft member 6 is idle with respect to the inertial body 7. The state becomes a small moment of inertia.

  In this variable inertia mass type vibration damping device 1, the relative movement in the axial direction between the casing 2 and the sleeve 3 due to the vibration between the two members to be damped is caused by the ball nut 5 and the ball screw 4 to rotate. 6 is converted into a rotational motion. The moment of inertia of the rotating shaft member 6 is converted into an inertial mass in the axial direction by the ball nut 5 and the ball screw 4. When the inertial body 7 rotates together with the rotating shaft member 6, the inertial moment becomes larger than that when only the rotating shaft member 6 rotates, so that the inertial mass is converted into a large inertial mass.

When a slow vibration is applied to the object to be controlled, a small inertia mass due to a small moment of inertia of only the rotating shaft member 6 acts to allow the vibration.
On the other hand, when a sudden vibration is applied, the coil 8b of the electromagnet 8 is energized, and as shown in FIG. 2, the sealed region 11 having the large-diameter cylinder 2b, the inertial body 7 and the rotating shaft member 6 as a magnetic circuit is orthogonal to the axis. A magnetic field M crossing the direction is formed, and the viscous hardness of the magnetorheological fluid 12 in the sealed region 11 is increased. A resistance such as a friction force larger than usual is generated between the rotating shaft member 6 and the inertial body 7 via the magnetorheological fluid 12, and the rotation of the rotating shaft member 6 is transmitted to the inertial body 7 by this resistance force. . Therefore, since the rotating shaft member 6 and the inertial body 7 rotate as a unit, a large moment of inertia is generated and converted into a large inertial mass to suppress vibration.

  It is assumed that the vibration due to an earthquake or the like is detected by a sensor such as an accelerometer, and the electromagnet 8 is energized by closing a circuit connected to the DC power source at a predetermined value.

  A second embodiment is shown in FIG. In the following description, the same components as those of the previous embodiment are denoted by the same reference numerals and description thereof is omitted. One end of the rotary shaft member 6 in the variable inertia mass damping device 13 is coupled to the ball screw 4 and the other end is supported by the inertia body 14 so as to be relatively rotatable. On the rotary shaft member 6, an enlarged diameter portion 6 a extending in the direction orthogonal to the axis within the large diameter cylinder 2 b is integrally formed. The enlarged diameter portion 6a is disposed at a position corresponding to the electromagnet 8 on the inner wall of the large diameter cylinder 2b. The inertia body 14 is disposed around the rotary shaft member 6 with a gap from the inner wall of the large-diameter cylinder 2b, and one end is rotatably supported on the rotary shaft member 6 and the other end is rotatably supported by the end wall of the large-diameter cylinder 2b. The As shown in FIG. 4, the inertial body 14 is made of a substantially columnar soft magnetic material through which the rotary shaft member 6 passes. The inertial body 14 is formed with a sealed region 14a in which the enlarged diameter portion 6a of the rotary shaft member 6 is disposed with a gap from the inner wall surface, and the magnetorheological fluid 12 is filled and enclosed therein.

Also in the variable inertia mass type vibration damping device 13, the relative movement in the axial direction between the casing 2 and the sleeve 3 due to the vibration between the two members that are the objects of vibration damping is performed by the ball nut 5 and the ball screw 4. 6 is converted into a rotational motion. When a slow vibration is applied, only the rotating shaft member 6 rotates and a small moment of inertia is converted into a small inertia mass in the axial direction, thereby allowing the vibration.
On the other hand, when sudden vibration is applied, energization of the coil 8b of the electromagnet 8 causes the large-diameter cylinder 2b, the inertial body 14, and the diameter-enlarged portion 6a of the rotary shaft member 6 to be hermetically sealed as shown in FIG. A magnetic field M crossing the region 14a in the axial direction is formed, and the viscous hardness of the magnetorheological fluid 12 filled in the sealed region 14a is increased. Therefore, the inertial body 14 rotates together with the rotating shaft member 6 so that a larger moment of inertia is converted into a larger inertial mass in the axial direction than when only the rotating shaft member 6 rotates, thereby suppressing vibration.

  A third embodiment is shown in FIG. The variable inertial mass damping device 15 includes two first and second damping devices 15a and 15b having substantially the same structure as that of the variable inertial mass damping device 1 in the first embodiment. This is a schematic structure. That is, the rotating shaft member 6 and the large diameter cylinder 2b of the first variable inertia mass type damping device 15a on the ball screw 4 side are the same as the rotating shaft member 6 and the large diameter cylinder of the second variable inertia mass type damping device 15b. Each inertial body 7 is independent from each other in the axial direction. A magnetorheological fluid 12 is filled and sealed in the sealed region 11. One or both of the electromagnets 8 of the first and second vibration damping devices 15a and 15b are energized so as to set the moment of inertia corresponding to the inertial mass corresponding to the slowness of vibration caused by an earthquake or the like.

  In the first and second damping devices 15a and 15b of the variable inertial mass damping device 15, when a slow vibration is applied to the damping target, a small inertia due to a small moment of inertia of only the rotary shaft member 6 is applied. The mass acts to allow vibration. When a sudden vibration is applied, the inertial body 7 rotates together with the rotating shaft member 6 by energization of the coil 8b of the electromagnet 8 of the first and second vibration damping devices 15a and 15b, so A large moment of inertia of the vibration devices 15a and 15b is converted into a large inertial mass in the axial direction to suppress vibration. At this time, the rotary shaft member 6 is engaged by selectively energizing one or both electromagnets 8 of the first and second variable inertia mass damping devices 15a and 15b according to the degree of sudden vibration. Since the number of inertial bodies 7 to be combined can be changed, the inertial mass can be adjusted according to the vibration. Further, by further increasing the number of connections of the variable inertial mass damping devices 15a and 15b, the inertial mass for suppressing the vibration can be increased and adjusted in multiple stages.

  A fourth embodiment is shown in FIG. This variable inertial mass damping device 16 is a schematic structure in which first and second damping devices 16a and 16b having substantially the same structure as the variable inertial mass damping device 13 in the second embodiment are connected in the axial direction. Structure. That is, the large-diameter cylinders 2b of the first and second variable inertia mass damping devices 16a and 16b are integrally coupled in the axial direction. The rotating shaft member 6 of the first variable inertial mass damping device 16a is independent of the rotating shaft member 6 of the second variable inertial mass damping device 16b. The inertial body 14 of the first variable inertial mass damping device 16a is integrally coupled to the rotary shaft member 6 of the second variable inertial mass damping device 16b. Therefore, the rotating shaft member 6 of the second variable inertia mass damping device 16b rotates together with the inertia body 14 of the first variable inertia mass damping device 16a. The inertial body 14 of the second variable inertial mass damping device 16b rotates when the electromagnets 8 of the first and second variable inertial mass damping devices 16a and 16b are energized.

  In the first and second damping devices 16a and 16b of the variable inertial mass damping device 16, when a slow vibration is applied, only the rotating shaft member 6 of the first damping device 16a rotates and has a small inertia. The moment is converted into a small inertial mass in the axial direction to allow vibration. When a sudden vibration is applied, the inertial body 7 rotates together with the rotating shaft member 6 by energization of the coil 8b of the electromagnet 8 of the first and second vibration damping devices 15a and 15b, so A large moment of inertia of the vibration devices 15a and 15b is converted into a large inertial mass in the axial direction to suppress vibration. At this time, an inertial body that engages with the rotary shaft member 6 by selectively energizing the electromagnet 8 of the first variable inertial mass damping device 15a or both electromagnets 8 according to the degree of rapid vibration. Since the number of 7 can be changed, it can adjust to the inertial mass according to a vibration. Further, by further increasing the number of connections of the variable inertial mass damping devices 15a and 15b, the inertial mass for suppressing the vibration can be increased and adjusted in multiple stages. Further, by further increasing the number of connections of the variable inertial mass damping devices 16a and 16b, a large damping force can be generated with respect to vibration, and adjustment can be made in multiple stages.

DESCRIPTION OF SYMBOLS 1 Mass variable type inertia damping device 2 Casing 2a Connection part 2b Large diameter cylinder 2c Small diameter cylinder 2d End wall 3 Sleeve 3a Connection part 4 Ball screw 5 Ball nut 6 Rotating shaft member 7 Inertial body 7a Wheel part 7b Yoke part 8 Electromagnet 8a Magnet casing 8b Coil 8c Yoke 9 Sealing material 10 Sealing material 11 Sealed region 12 Magnetorheological fluid 13 Sealed region 14 Inertial body 14a Wheel unit 14b Yoke unit 15 Variable inertia mass damping device 15a First variable inertia mass damping device 15b Second variable inertia mass damping device 16 Variable inertia mass damping device 16a First variable inertia mass damping device 16b Second variable inertia mass damping device

Claims (6)

A motion conversion mechanism that is fixed between one member that is a vibration suppression target and the other member that is a vibration suppression target, and that converts linear relative movement between the two due to vibration into a rotational motion, and this motion conversion mechanism A rotating shaft member rotatably supported in the casing so as to be connected and rotated together, and an inertial body that engages with the rotating shaft member and applies rotational resistance by the moment of inertia. In inertial mass type damping device that suppresses vibration by converting inertial moment to inertial mass by motion conversion mechanism,
The casing includes an electromagnet that forms a magnetic field using the rotating shaft member and the inertial body as a part of a magnetic circuit,
The inertial body is supported in the casing so as to be relatively rotatable coaxially with the rotary shaft member, and forms a sealed region with the rotary shaft member;
In the sealed area, a magnetorheological fluid whose viscosity changes by application of a magnetic field is enclosed,
A variable inertia characterized by applying a magnetic field across a sealed region by the electromagnet, applying a viscous resistance to the relative rotation of the rotating shaft member with respect to the inertial body, and rotating the inertial body integrally with the rotating shaft member. Mass type damping device.   2. The variable inertial mass according to claim 1, wherein the sealed region is formed in an annular shape around the rotating shaft member, and a magnetic field in an axis orthogonal direction is formed between the rotating shaft member and the inertial body. Mold damping device.   The said rotating shaft member expands in diameter in bowl shape, protrudes in the said sealing | blocking area | region, and the magnetic field of an axial direction is formed between a rotating shaft member and the said inertial body. Variable inertia mass damping device.   The variable inertial mass type damping device according to claim 2, wherein the casing and the rotating shaft member are shared, and a plurality of variable inertial mass type damping devices are connected in the axial direction, and the inertial mass is increased stepwise by sequentially energizing the electromagnets respectively. A variable inertial mass type vibration damping device.   A plurality of variable inertial mass damping devices according to claim 3 are provided in the axial direction with the casing in common, and the inertial body and the rotary shaft member of the variable inertial mass damping devices adjacent to each other are provided. A variable inertia mass type vibration damping device, wherein the inertial mass is increased stepwise by coupling and sequentially energizing the electromagnets. The motion conversion mechanism includes a casing fixed to one member that is a vibration control target,
A ball screw rotatably supported about an axis in the casing and supported so as not to move in the axial direction, and coaxially coupled to the rotary shaft member;
A sleeve having a ball nut that is fixed to the other member that is the object of vibration control and that can be moved forward and backward in the axial direction and that cannot be rotated about the axis, and that is screwed into the ball screw. The variable inertial mass damping device according to any one of claims 1 to 5.

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