JP2002168283A - Magnetic viscous fluid flowing type damper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact magnetic viscous fluid flowing type damper capable of easily manufacturing in a compact size and having no use for a seal. SOLUTION: The damper comprises a cylinder 1, in which the cylinder connects the damper with a supporting body or a supported body, a filling up magnetic viscous fluid, a piston rod 2 connecting with the other side, a piston 3 dividing inside the cylinder 1 into compartments 8, 9, a bypass tube 4 arranged in a lower portion of the cylinder 1, and a reservoir 5 coaxially arranged in inside the bypass tube 4 at certain interval. Numbers of an electromagnet 12 buried a coil in a cylindrical peripheral wall made of pure iron as an iron core material are provided in the bypass tube 4 in an axial direction. A magnetic viscous fluid circulates through a clearance in proportion to movement of the piston 3, and flowing resistance is enlarged by a magnetic field, and vibration is eventually damped. The reservoir 5 is located inside the bypass tube 4 and takes a small amount of space, and a lead wire of the coil of the electromagnet 12 can be pulled out through inside the peripheral wall of the bypass tube 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses a magnetorheological fluid having a characteristic of increasing the viscosity and increasing the flow resistance when a magnetic field is applied, and moving the magnetorheological fluid through the magnetic field of an electromagnet by moving a piston accompanying vibration. The present invention relates to a magnetic viscous fluid flow type vibration damping device that attenuates vibration by its flow resistance.

[0002]

2. Description of the Related Art Conventionally, a magnetic viscous fluid flow type vibration damping device has
A cylinder is connected to one of the support and the supported body, and a piston rod is inserted into the cylinder so as to be freely inserted into and removed from the cylinder. The piston is divided into first and second compartments in the cylinder. Is fixed, and the inside of the cylinder is filled with a magnetorheological fluid. An orifice tube is communicated with the first and second compartments of the cylinder, and a mounting shaft is passed through the inside of the cylinder, and an electromagnet is provided around this axis. Vibration is attenuated by resistance. Further, a reservoir is connected to the first and second compartments of the cylinder to absorb a volume change caused by a temperature rise caused by the dissipation of vibration energy.

[0003]

In the above-mentioned conventional vibration damping device, since the bypass pipe and the reservoir are provided outside the cylinder, the device becomes large. In addition, since the electromagnet is provided on the shaft in the orifice tube, the lead wire connected to the coil of the electromagnet is immersed in the magnetorheological fluid, and there are multiple places where the lead wire is pulled out to connect to the external power supply, preventing liquid leakage There is a problem that it is necessary to provide a seal to perform the manufacturing, and it is not easy to manufacture. Therefore, the present invention provides a magnetic viscous fluid flow type vibration damping device which can be made compact, can be miniaturized, and the lead wire leading to the electromagnet is not exposed to the magnetic viscous fluid, and there is no risk of liquid leakage and is easy to manufacture. The challenge is to do that.

[0004]

In order to solve the above-mentioned problems, according to the present invention, a cylinder 1 filled with a magnetorheological fluid is connected to one of a support and a supported body, and the other is moved into and out of the cylinder 1. The freely inserted piston rod 2 is connected, and the inside of the cylinder 1 is partitioned into the first and second compartments 8 and 9, and the piston 3 movable in the axial direction in the cylinder 1 is fixed to the piston rod 2. Then, an electromagnet 12 for forming a magnetic field perpendicular to the axial direction is provided on the inner wall of the bypass pipe 4 communicating with the first and second compartments 8 and 9 by filling the inside thereof with the magnetic viscous fluid. The reservoir 5 is disposed with a gap that gives flow resistance to the magnetorheological fluid, and the flow of the magnetorheological fluid due to the slow relative displacement of the piston 2 is allowed in the first and second compartments 8 and 9 of the cylinder 1. Through the valve 15 Accommodates a magneto-rheological fluid therein,
A magnetic material that forms a magnetic field between the electromagnet 12 and the outer periphery is provided on the outer periphery to form a magnetic viscous fluid flow type vibration damping device.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to the drawings. In FIG. 1, a vibration damping device includes a cylinder 1 connected to a support or a supported body such as a construction (not shown) via a pull 6, and a pull 7 for the supported or supported body.
, A piston 3 fixed on the piston rod 2, a piston 3 fixed on the piston rod 2, a bypass pipe 4 provided at a lower portion of the cylinder 1, and a bypass pipe 4. And a reservoir 5 provided in the inside 4. The interior of the cylinder 1 is partitioned into compartments 8 and 9 by a piston 3. The inside of the cylinder 1 and the bypass pipe 4 is filled with a magnetic viscous fluid.
Is adjusted in the reservoir 5 via As the valve 15, for example, a poppet valve or the like that performs an opening / closing operation so as to prevent a rapid flow of a fluid but allow a slow flow is used. The bypass pipe 4 and the reservoir 5 communicate with the compartments 8 and 9.

[0006] As shown in FIGS. 2 and 3, the bypass pipe 4 is provided with a coil 11 on a cylindrical pure iron peripheral wall 10 forming an iron core material.
Are provided in the axial direction with a large number of electromagnets 12 each having embedded therein. Magnetic flux passes through the inside of the peripheral wall 10 by the electromagnet 12, and a magnetic field is formed in the radial direction.

The reservoir 5 has a cylindrical shape and has a bypass pipe 4.
Are provided coaxially at a small interval for allowing a magnetic viscous fluid to flow through the inside. The magnetic poles 13 project from the reservoir 5 at equal intervals in the axial direction. In the gap S between the magnetic pole 13 and the electromagnet 12, a magnetic field in the direction of the gap is formed by the electromagnet 12. One end of the bypass pipe 4 has a coil 11
Is provided, and the lead wire 14 is connected to a power supply unit (not shown).

[0008] The vibration damping device is interposed between structural members of a high-rise building, for example. When a relative displacement between the two occurs due to vibration, the piston rod 2 is pushed into the cylinder 1 or pulled out of it. When the piston 3 moves, the volumes of the compartments 8 and 9 change, and the magnetorheological fluid inside the compartments flows. For example, when the piston 3 moves leftward in FIG. 1, the magnetorheological fluid is pushed out of the compartment 8 by the piston 3, flows through the bypass pipe 4, and moves to the compartment 9.
At this time, inside the bypass pipe 4, as shown in FIG. 3, the flow of the magnetorheological fluid is restricted by the gap S, and a flow resistance is generated to hinder the movement of the piston 3 to attenuate the vibration. Further, a magnetic field is formed in the bypass pipe 4 by the electromagnets 12 and the magnetic poles 13 as indicated by broken arrows in FIG. Is further attenuated. By adjusting the magnetic field of the electromagnet 12, the damping force against vibration can be adjusted. The reservoir 5 performs opening and closing operations so that the valve 15 prevents a rapid flow of the fluid, but allows a slow flow, so that the volume change of the magnetic viscous fluid caused by the temperature rise caused by the dissipation of the vibration energy is suppressed. Absorb.
Since the reservoir 5 is housed inside the bypass pipe 4, the space of the reservoir 5 can be made compact without taking extra space outside the cylinder 1. Electromagnet 1
Since the second coil 11 is embedded in the inner wall of the bypass pipe 4, the lead wire 14 is not submerged in the magnetorheological fluid,
Since it reaches the outlet 16 through the inside of the peripheral wall 10 of the bypass pipe 4, there is no need for sealing and there is no risk of liquid leakage.

[0009]

As described above, according to the present invention, since the reservoir is accommodated in the bypass pipe, it is possible to make it compact. Since the electromagnet is provided on the peripheral wall of the bypass pipe, the lead wire leading to the coil can be drawn out without being immersed in the magnetic viscous fluid, so that there is no need for a seal, there is no danger of liquid leakage, and there is an effect that the manufacture becomes easy.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a magnetic viscous fluid flow type vibration damping device according to the present invention.

FIG. 2 is a longitudinal sectional view of a bypass pipe.

FIG. 3 is a partially enlarged sectional view of a bypass pipe.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylinder 2 Piston rod 3 Piston 4 Bypass pipe 5 Reservoir 8 Compartment 9 Compartment 10 Peripheral wall 11 Coil 12 Electromagnet 13 Magnetic pole 14 Lead wire 15 Poppet valve 16 Pull-out part S Gap

Claims (1)

[Claims] Claims: 1. A method according to claim 1, wherein the first member is connected to one of a support member and a support member.
A cylinder filled with a magnetic viscous fluid therein, a piston rod connected to the other side and inserted into and out of the cylinder, and fixed to the piston rod;
A piston which is axially movable in a cylinder, and which is filled with a magnetorheological fluid and communicates with the first and second compartments, and has an inner wall orthogonal to the axial direction. A bypass pipe provided with an electromagnet for forming a magnetic field, and a gap provided in the bypass pipe to give a flow resistance to the magnetorheological fluid;
, Which communicates via a valve that permits the flow of a magnetorheological fluid due to the slow relative displacement of the piston, accommodates the magnetorheological fluid inside, and forms a magnetic field between the electromagnet and the outer periphery. And a reservoir having a body.