JPH09264492A - Vibration control device for electrical viscous fluid - Google Patents

Vibration control device for electrical viscous fluid

Info

Publication number
JPH09264492A
JPH09264492A JP9920796A JP9920796A JPH09264492A JP H09264492 A JPH09264492 A JP H09264492A JP 9920796 A JP9920796 A JP 9920796A JP 9920796 A JP9920796 A JP 9920796A JP H09264492 A JPH09264492 A JP H09264492A
Authority
JP
Japan
Prior art keywords
rotating
cylindrical
slider
lid
oil seal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP9920796A
Other languages
Japanese (ja)
Inventor
Yoshiaki Iwata
Katsuaki Sagota
Izumi Tamura
義明 岩田
泉 田村
勝昭 砂子田
Original Assignee
Sanwa Tekki Corp
三和テッキ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sanwa Tekki Corp, 三和テッキ株式会社 filed Critical Sanwa Tekki Corp
Priority to JP9920796A priority Critical patent/JPH09264492A/en
Publication of JPH09264492A publication Critical patent/JPH09264492A/en
Pending legal-status Critical Current

Links

Abstract

PROBLEM TO BE SOLVED: To provide a large damping force using a relatively small device, and control a damping force over a wide range even at a high speed by forming the outer surface of a rotor fixed to a center shaft and the inner surface of a cylinder as electrode surfaces corresponding to each other. SOLUTION: A member 2d of a lid body 2 and a pull handle 13a of a slider 13 are connected to a structure or equipment. When the slider 13 moves in a guide cylinder 12 in a contracting direction, due to exposure to the vibration of the structure or the like, a nut body 14 at the end of the slider 13 causes the reciprocating motion of a center shaft 6 held on lid bodies 2 and 3 via a screw shaft 6a and bearings 4 and 5, and a rotor 7 fixed to the center shaft 6. An electrical viscous fluid 10 is retained in a control gap 10b between the outer surface of the rotor 7 and the inner surface of a cylindrical body 1 via an oil seal 8, and the viscosity of the fluid 10 increases, when voltage is applied to the electrode surface of the control gap 10b, thereby applying braking torque for the reciprocating rotation of the rotor 7. In addition, the braking torque of the rotor 7 is converted into a damping force along the axial direction of the slider 13 via the screw shaft 6 and the nut body 14. The vibration of the structure is thereby controlled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration damping device for a building itself in which an electrorheological fluid is used and a generated damping force is variable depending on an applied voltage, or a relative vibration damping device between devices. .

[0002]

2. Description of the Related Art An electrorheological fluid is a fluid whose viscosity changes according to an applied voltage, and has a characteristic that it has a fast response speed and consumes very little power. Japanese Unexamined Patent Publication (Kokai) No. 6-2731 is known to utilize this as a vibration damping means. This uses a cylinder as shown in Fig. 1 and causes a one-way flow in the electrorheological fluid by the movement of the piston and the action of the check valve, and this flow is the control gap between the cylinder and the tube concentrically arranged outside the cylinder. To use the outer surface of the cylinder and the inner surface of the tube as the corresponding electrode surfaces for the vehicle suspension system.
The damping force is adjusted by controlling the voltage applied to the electrode surface according to the vibration transmitted from the road surface and changing the fluid viscosity in the control gap.

[0003]

However, the one using the cylinder as described above shows a strong dependence on the fluid velocity because the electrorheological fluid flows through the control gap at a high pressure and at a high speed. When used with, at high speeds you may experience a slipping condition like a broken chain. If the damping force is increased or the control gap is made smaller so that the damping force can be controlled even at a low voltage, the flow path area is reduced and a throttling effect unrelated to the applied voltage is generated. There is also a problem that it cannot be controlled over a wide range. In order to control a large damping force over a wide range without changing the interval, it is necessary to secure a large area for the control gap, and the device becomes large. The present invention was created in view of the above circumstances, and an object thereof is to provide an electrorheological flow vibrating device capable of obtaining a large damping force in a relatively small size and controlling the damping force over a wide range even at high speeds. It is in.

[0004]

In order to achieve the above object, a casing in which a lid is fixed to both ends of a cylindrical body,
In the outer periphery of the bearing, there is a central shaft that is supported by lids at both ends of the cylinder through bearings and is capable of reciprocating rotation, a rotating body that is fixed to the central shaft and has an outer surface facing the inner surface of the cylindrical body at appropriate intervals. An oil seal provided between the lid and the rotating body, a guide tube fixed to one lid, a screw shaft provided in an extension of the central shaft, and a slider slidably inserted in the guide tube. , A sliding key provided between the guide tube and the slider, a nut body fixed to the slider tip end and screwed with the screw shaft, and a fluid chamber filled with an electrorheological fluid in an outer space of the bearing closed by an oil seal. And the outer surface of the rotating body and the inner surface of the cylindrical body are corresponding electrode surfaces.

[0005]

When the slider of this device receives the vibration of the structure and moves in the expansion / contraction direction in the guide cylinder, the nut body at the slider tip, whose rotation is constrained by the slide key, is fixed at both ends of the casing via the screw shaft and the bearing. The central axis supported by the lid and the rotary body fixed to the central axis are reciprocally rotated. The electrorheological fluid is held in the control gap between the outer surface of the rotating body and the inner surface of the cylindrical body by an oil seal. When a voltage is applied to the electrode surface of the control gap, the viscosity of the electrorheological fluid increases, and a braking torque is applied to the reciprocating rotation of the rotating body. The braking torque of the rotating body is converted into a damping force in the axial direction of the slider by the screw shaft, the nut body, and the sliding key, and the vibration of the structure is damped.

The flow of the electrorheological fluid in this device is different from the cylinder that flows through the control gap at high pressure and high speed, and because of the resistance due to the so-called shear flow generated by the relative movement between the rotating body and the electrorheological fluid, the braking torque is increased. It has little speed dependence and can exert viscous effect even in high speed range. The electrode surface has a space of about 1 mm, and a voltage of 0 to several KV is applied from the external power supply and controller, but the current density is 0.
Power consumption is extremely low, about several tens of microamps / cm @ 2. The response speed of the braking torque is several msec to several tens msec.
Therefore, even if a random wave in which various kinds of vibrations are overlapped is received, the optimum damping force can be instantly generated according to the dynamic behavior such as the frequency, the speed, and the acceleration that changes every moment. Braking torque is generated in proportion to the outer diameter and length of the rotating body and the applied voltage, and acts on the central axis.Because the lead of the screw shaft provided in the extension of the central axis also serves as an element for increasing or decreasing the damping force. The device can be miniaturized.

[0007]

DETAILED DESCRIPTION OF THE INVENTION The drawings will be described. Cylindrical body 1
Forms a casing by fixing the lids 2 and 3 to the outer peripheral portions of both ends, and the lid 2 integrates the four members 2a, 2b, 2c and 2d, and the lid 3 integrates the two members 3a and 3b. . Member 2
a and 3a are made of an insulating material such as engineering plastic, and electrically insulate the cylindrical body 1 and the rotating body 7 from each other.
The terminal 16 provided on the fastening bolt between the a and the member 3b is the rotating body 7.
In addition, the terminal 17 provided on the fastening bolt between the member 3a and the cylindrical body 1
Can energize the cylindrical body 1.

The inner diameters of the members 2b and 3b support the central shaft 6 via bearings 4 and 5, respectively. The bearings 4 and 5 are lubricated by grease or the like. The rotating body 7 is attached to the central shaft 6.
Are fixed, and the outer periphery of the rotating body 7 faces the inner surface of the cylindrical body 1 with a control gap 10b having an appropriate gap. However, the present invention is not restricted by the shape of the control gap 10b. The tapered control gap 10b having one end having a large diameter and the other end having a small diameter has an advantage that the control gap 10b can be adjusted by the relative axial movement of the cylindrical body 1 and the rotating body 7. .

Oil seals 8 are provided on the outer peripheral portions of the bearings 4 and 5 between the lids 2 and 3 and the rotating body 7. The oil seal 8 has an outer diameter portion fixed to the end surface concave portion of the rotating body 7, and an inner diameter portion sliding on the convex portions of the members 2b and 3b to seal the electrorheological fluid 10 in the fluid chamber 10a. The oil seal 8 is made of rubber and is flexible and has a high sealing property. Since the electrorheological fluid 10 is not lubricating oil, the oil seal 8 allows the bearings 4,
5 and the electrorheological fluid 10 are separated. Electrorheological fluid 1
When the particles are dispersed in 0, the destruction of the particles by the bearings 4, 5 and the damage of the bearings 4, 5 by the particles can be prevented.

Further, the oil seal 8 can be replaced with a mechanical seal 9. The inner diameter of the slider 9a of the mechanical seal 9 is axially supported by the O-ring 9c mounting portions of the members 2b and 3b, and the reaction force of the spring 9b and the internal pressure of the fluid chamber 10a acting on the slider 9a are applied to the rotor 7. The electrorheological fluid 10 is sealed by pressing against the side surface. If a conductive material such as a metal is used for the slider 9a and the spring 9b, an energizing function is added in addition to the sealing function, and an electric circuit is formed without passing through the bearings 4 and 5, so that the bearings 4 depending on the energizing 5 can be prevented from being damaged. Further, in order to reinforce the sealing function of the mechanical seal 9 having an energizing function, the mechanical seal 9
It is also possible to use the oil seal 8 and the oil seal 8 together.

The temperature and volume of the electrorheological fluid 10 change due to the ambient temperature and the damping action. This is because when the vibration damping device absorbs the kinetic energy of the structure, the kinetic energy is converted into heat energy, and in the case of the present device, the temperature of the electrorheological fluid rises. Therefore, a plurality of through holes 1a communicating with the fluid chamber 10a are provided on the same radial line of the cylindrical body 1,
An accumulator 11 made of rubber foam accumulated or a bellows-like metal bellows with both end plates attached was arranged. The accumulator 11 absorbs a change in volume of the electrorheological fluid 10, and prevents the electrorheological fluid 10 from being insufficient to generate a gas portion, which cannot be controlled, or the pressure increases to cause oil leakage. The electrorheological fluid 10 can be replenished from the oil supply port 1b communicating with one of the through holes 1a in which the accumulator 11 is not inserted.

When the device continuously absorbs the kinetic energy of a structure, the energy converted heat is stored in the device. When heat accumulates, the temperature rises, and there is concern that the material may deteriorate and the vibration damping function may deteriorate. Even if it is a vibration control device, some measures are required. In this device, a heat radiating plate 1c is formed on the outer peripheral exposed portion of the cylindrical body 1 so that the temperature does not rise even if the kinetic energy of the structure is continuously absorbed.

A slider 13 is slidably inserted into the guide cylinder 12 fixed to the lid body 3, and the guide cylinder 12 and the slider 1 are connected.
A slide key 15 for preventing rotation is provided between 3 and a screw shaft 6a provided at an extension of the central shaft 6 is screwed with a nut body 14 fixed to the tip of the slider 13 to form a central shaft reciprocating rotating device. I am configuring. For the screw shaft 6a and the nut body 14, a ball screw having high transmission efficiency is usually used.

The present apparatus constructed as described above has a lid 2
The member 2d and the pull tab 13a of the slider 13 are used by being connected to a structure or equipment. When the slider 13 of this device receives vibration of a structure or the like and moves in the guide tube 12 in the expansion / contraction direction, the nut body 14 at the tip of the slider 13 whose rotation is restricted by the slide key causes the screw shaft 6a and the bearing 4 to rotate. , 5 to reciprocally rotate the central shaft 6 supported by the lids 2 and 3 at both ends of the casing and the rotary body 7 fixed to the central shaft 6. The electrorheological fluid 10 is the oil seal 8 or the mechanical seal 9
Therefore, it is held in the control gap 10b between the outer surface of the rotating body 7 and the inner surface of the cylindrical body 1. When a voltage is applied to the electrode surface of the control gap 10b, the viscosity of the electrorheological fluid 10 increases, and a braking torque is applied to the reciprocating rotation of the rotating body 7. The braking torque of the rotating body 7 is converted into a damping force in the slider axial direction by the screw shaft 6a and the nut body 14 to suppress the vibration of the structure.

[0015]

The flow of the electrorheological fluid in this device is
Unlike a hydraulic cylinder that flows through a control gap at high pressure and high speed, since it is a simple shear flow, there is little speed dependence of the braking torque, and there is no throttling effect that occurs regardless of the applied voltage. Therefore, the viscous effect can be exhibited even in the high speed region, and a large damping force can be controlled in a wide range. Further, the braking torque is generated in proportion to the outer diameter and length of the rotating body and the applied voltage and acts on the central axis, but the lead of the screw shaft provided in the extension of the central axis is also an element for increasing or decreasing the damping force. Therefore, the device can be downsized.

If a conductive material such as a metal is used for the slider and spring of the mechanical seal, an energizing function is added in addition to the sealing function, and an electric circuit is formed without energizing the bearing. Can prevent damage.

Since the accumulator is arranged in the fluid chamber,
The accumulator absorbs the volume of the electrorheological fluid that changes due to the ambient temperature and the damping action, and the electrorheological fluid becomes insufficient to generate a gas part, which makes it impossible to control, or the pressure rises and causes oil leakage. It can be prevented.

Since the heat radiating plate is formed on the outer peripheral exposed portion of the cylindrical body, the kinetic energy of the structure is absorbed and the accumulated heat is released, so that deterioration of the material and deterioration of the vibration damping function can be prevented.

The electrode surfaces are spaced by about 1 mm, and a voltage of 0 to several kV is applied from an external power source and a controller, but the current density is 0 to several tens μA / cm 2 and the power consumption is extremely low. The response speed of the braking torque is several mSec to several tens mSce, and even if a random wave in which various vibrations are overlapped is received, the optimum damping force is generated instantly according to the dynamic behavior such as frequency, speed, acceleration, etc. it can.

[Brief description of drawings]

FIG. 1 is a cut front view showing a first embodiment of the present device.

FIG. 2 is a cut front view showing a second embodiment of the present device.

FIG. 3 is a cut front view showing a conventional embodiment using a cylinder.

[Explanation of symbols]

 1 Cylindrical Body 1a Through Hole 1b Oil Filling Port 1c Heat Dissipation Plate 2 Lid Body 2a Member of Lid Body 2b Member of Lid Body 2c Member of Lid Body 2d Member of Lid Body 3 Member of Lid Body 3a Member of Lid Body 3b Lid Members of body 3 4 Bearing 5 Bearing 6 Center shaft 6a Screw shaft 7 Rotating body 8 Oil seal 9 Mechanical seal 10 Electrorheological fluid 10a Fluid chamber 10b Control clearance 11 Accumulator 12 Guide cylinder 13 Slider 13a Puller 14 Nut body 15 Sliding key 16 Terminal 17 Terminal

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Office reference number FI technical display location F16F 15/02 8312-3J F16F 15/02 F

Claims (6)

[Claims]
1. A casing formed by fixing lids to both ends of a cylindrical body, a central shaft supported by the lids at both ends of the cylindrical body through bearings and capable of reciprocating rotation, and an outer surface fixed to the central shaft with an appropriate interval. The rotating body facing the inner surface of the cylindrical body with an oil seal provided between the cover body and the rotating body at the outer peripheral portion of the bearing, and the electrorheological fluid in the bearing outer space closed by the oil seal. An electrorheological vibrating vibrating device comprising a filled fluid chamber, wherein the outer surface of the rotating body and the inner surface of the cylindrical body are corresponding electrode surfaces.
2. A mechanical seal, which is axially supported by a lid at the outer peripheral portion of the bearing and whose end face is pressed against the side face of the rotating body by a spring, is used instead of the oil seal according to claim 1. Electro-viscous flow system vibration device.
3. An electrorheological flow vibrating device, wherein the oil seal according to claim 1 and the mechanical seal according to claim 2 are used together between the lid and the rotating body in the outer peripheral portion of the bearing.
4. The vibration damping device according to claim 1, wherein an accumulator made of rubber foam integrated or a bellows-like metal bellow with both end plates attached is provided in a part of the fluid chamber. Electro-rheological flow system vibration device.
5. The vibration damping device according to claim 1, wherein a heat radiating plate is formed on an outer peripheral exposed portion of the cylindrical body.
6. A guide cylinder fixed to one lid according to claim 1, a screw shaft provided in an extension of the central shaft, a slider slidably inserted in the guide cylinder, and a guide cylinder. An electrorheological flow vibrating device further comprising a central shaft reciprocating rotating device including a sliding key provided between sliders and a nut body fixed to the slider tip end and screwed with the screw shaft.
JP9920796A 1996-03-28 1996-03-28 Vibration control device for electrical viscous fluid Pending JPH09264492A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9920796A JPH09264492A (en) 1996-03-28 1996-03-28 Vibration control device for electrical viscous fluid

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9920796A JPH09264492A (en) 1996-03-28 1996-03-28 Vibration control device for electrical viscous fluid

Publications (1)

Publication Number Publication Date
JPH09264492A true JPH09264492A (en) 1997-10-07

Family

ID=14241213

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9920796A Pending JPH09264492A (en) 1996-03-28 1996-03-28 Vibration control device for electrical viscous fluid

Country Status (1)

Country Link
JP (1) JPH09264492A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001092753A1 (en) * 2000-05-31 2001-12-06 Thk Co., Ltd. Damping device
KR100696934B1 (en) * 2000-03-28 2007-03-21 주식회사 만도 Shock absorber using magnetorheological fluid
US7232016B2 (en) 2003-12-08 2007-06-19 General Motors Corporation Fluid damper having continuously variable damping response
US7303056B2 (en) * 2004-12-09 2007-12-04 General Motors Corporation Magnetorheological device and system and method for using the same
JP2009068572A (en) * 2007-09-12 2009-04-02 Kayaba Ind Co Ltd Magnetic viscous fluid shock absorber
US7624850B2 (en) * 2005-08-24 2009-12-01 Gm Global Technology Operations, Inc. Damping device having controllable resistive force
CN102937158A (en) * 2012-11-12 2013-02-20 富奥汽车零部件股份有限公司 Magneto-rheological fluid damper for automobile
CN108808970A (en) * 2018-06-26 2018-11-13 苏州舍勒智能科技有限公司 A kind of servo electric jar of accurate thrust control

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100696934B1 (en) * 2000-03-28 2007-03-21 주식회사 만도 Shock absorber using magnetorheological fluid
JP2001336570A (en) * 2000-05-31 2001-12-07 Thk Co Ltd Damping device
US6499573B1 (en) 2000-05-31 2002-12-31 Thk Co., Ltd. Damping device
WO2001092753A1 (en) * 2000-05-31 2001-12-06 Thk Co., Ltd. Damping device
JP4633229B2 (en) * 2000-05-31 2011-02-23 Thk株式会社 Damping device
DE102004058736B4 (en) * 2003-12-08 2011-09-15 General Motors Corp. (N.D.Ges.D. Staates Delaware) Fluid damper with continuously variable damping response
US7232016B2 (en) 2003-12-08 2007-06-19 General Motors Corporation Fluid damper having continuously variable damping response
US7303056B2 (en) * 2004-12-09 2007-12-04 General Motors Corporation Magnetorheological device and system and method for using the same
DE102005058254B4 (en) * 2004-12-09 2014-02-13 General Motors Corp. Magnetorheological device and magnetorheological system and method of using the same
US7686143B2 (en) 2004-12-09 2010-03-30 Gm Global Technology Operations, Inc. Magnetorheological device and system and method for using the same
US7624850B2 (en) * 2005-08-24 2009-12-01 Gm Global Technology Operations, Inc. Damping device having controllable resistive force
JP2009068572A (en) * 2007-09-12 2009-04-02 Kayaba Ind Co Ltd Magnetic viscous fluid shock absorber
CN102937158A (en) * 2012-11-12 2013-02-20 富奥汽车零部件股份有限公司 Magneto-rheological fluid damper for automobile
CN108808970A (en) * 2018-06-26 2018-11-13 苏州舍勒智能科技有限公司 A kind of servo electric jar of accurate thrust control

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