JP7033570B2 - Active anti-vibration device and its manufacturing method - Google Patents

Description

The present invention relates to an active vibration isolator and a method for manufacturing the same.

Conventionally, as an active type anti-vibration device, a vibration damping device in which a magnetic viscoelastic fluid (MRF: Magneto-Rheological Fluid) is enclosed is known (see, for example, Patent Document 1). In this vibration damping device, the damping characteristic with respect to the vibration amplitude input in one direction such as the vertical direction is made variable by the magnetic viscoelastic fluid whose apparent viscosity changes according to the strength of the magnetic field.
Further, as an active type vibration isolator, a dynamic vibration absorber in which a magnetic viscoelastic elastomer (MRE: Magneto-Rheological Elastomer) is arranged in a predetermined magnetic path is known (see, for example, Patent Document 2). This dynamic vibration absorber supports a movable mass with a magnetic viscoelastic elastoma, and the rigidity of the magnetic viscoelastic elastoma serving as a support spring is made variable according to the strength of the magnetic field.

International Publication No. 2017-047682 International Publication No. 2016-148011

By the way, when a conventional active vibration isolator (see, for example, Patent Documents 1 and 2) is applied to a subframe mount, for example, not only vibration transmitted from the power unit side such as an engine to the vehicle body but also the road surface when the vehicle is running It is also necessary to consider the external force transmitted from the side.
Specifically, as an active vibration isolator applied to this mount, it is of course necessary to assume external force input from multiple directions when the vehicle is running, and stability against lateral G when steering. It is expected to improve vibration convergence when the vehicle gets over the protrusions on the road surface, and road noise isolation when the vehicle travels on a rough road surface at a constant speed.
However, since the conventional vibration damping device having a magnetic viscoelastic fluid (see, for example, Patent Document 1) has a configuration assuming only vibration to be input in one direction as described above, it is input from multiple directions. It cannot be applied to the mounting of subframes that must assume the external force to be applied.
Further, a conventional vibration damping device having a magnetic viscoelastic elastoma (see, for example, Patent Document 2) increases the rigidity of the magnetic viscoelastic elastoma by applying a magnetic field from an initial state in which a magnetic field is not applied, and changes the rigidity. It is configured to make effective use of the width. That is, the conventional vibration damping device having a magnetic viscoelastic elastomer is not configured to be applied to a subframe mount that must support a heavy object such as a power unit in the initial state.
Further, assuming an active type anti-viscoelastic device having both a magnetic viscoelastic fluid and a magnetic viscoelastic elastomer, there is a problem that the device itself becomes large.

The subject of the present invention is an active type defense that can cope with an external force input from multiple directions, has variable rigidity performance and variable vibration damping performance according to the magnitude of the external force, and can achieve compactification. The present invention is to provide a vibration device and a method for manufacturing the same.

The active anti-vibration device that solves the above problems is formed between the inner cylinder, the outer cylinder arranged coaxially with the inner cylinder on the outer peripheral side of the inner cylinder, and the inner cylinder and the outer cylinder. An elastic member that tightly seals between the inner cylinder and the outer cylinder at both ends in the axial direction so that the magnetic viscoelastic fluid is held in the liquid chamber and the inner cylinder. An exciting coil arranged in either a cylinder or the outer cylinder to generate a magnetic field, a magnetic member that forms an axial magnetic path and an axial perpendicular magnetic path by the exciting coil, and the axial magnetic path. The magnetic viscoelastic elastoma comprises a magnetic viscoelastic elastoma that is interposed in each of the axially directional magnetic paths and contains magnetic particles that face the axially directional magnetic path and the axially directional magnetic path. A flow path of the magnetic viscoelastic fluid is formed, and the magnetic material member faces the flow path so as to form an axial magnetic path and an axial perpendicular magnetic path in the flow path. And.

Further, the method for manufacturing the active type anti-vibration device that solves the above-mentioned problems is the above-mentioned method for manufacturing the active-type anti-vibration device, in which the exciting coil and the magnetic material member are placed at predetermined positions in the outer cylinder. And, except for the step of arranging the core imitating the flow path and the inner cylinder, and the space portion in which the liquid chamber and the elastic member are arranged, the space portion in the outer cylinder is not provided. It is included in the uncured magnetic viscoelastic elastoma along the step of introducing the cured magnetic viscoelastic elastoma and the axial magnetic path and the axial perpendicular magnetic path formed by energizing the exciting coil. A step of curing the uncured magnetic viscoelastic elastoma while orienting the magnetic particles, a step of forming the flow path in the cured magnetic viscoelastic elastoma by removing the core from the inside of the outer cylinder, and the above-mentioned step. It is characterized by having a step of forming the liquid chamber by sealing between the inner cylinder and the outer cylinder with an elastic member and filling the liquid chamber and the flow path with the magnetic viscoelastic fluid. And.

According to the present invention, it is possible to cope with an external force input from multiple directions, and also to have a variable rigidity performance and a variable vibration damping performance according to the magnitude of the external force, and it is possible to achieve compactification. A shaking device and a method for manufacturing the same can be provided.

It is a schematic diagram which shows the application example of the active type anti-vibration device which concerns on embodiment of this invention. It is sectional drawing of the active type anti-vibration device which concerns on embodiment of this invention. FIG. 2 is a sectional view taken along line III-III of FIG. FIG. 2 is a sectional view taken along line IV-IV of FIG. FIG. 2 is a sectional view taken along line VV of FIG. FIG. 2 is a sectional view taken along line VI-VI of FIG. FIG. 2 is a cross-sectional view taken along the line VII-VII of FIG. It is operation | movement explanatory drawing of the active type vibration isolation device when the vibration amplitude is input in the axial direction with respect to the inner cylinder. It is an operation explanatory diagram of the active type vibration isolation device when the vibration amplitude is input in the direction perpendicular to the axis with respect to the inner cylinder. (A) and (b) are manufacturing process diagrams of an active type anti-vibration device.

Next, an active type anti-vibration device according to a mode for carrying out the present invention (the present embodiment) will be described. In the present embodiment, the active vibration isolator will be specifically described based on an example applied to the mounting of the subframe with reference to the drawings as appropriate. The present invention is not limited to this, and can be applied to all fields related to vibration isolation.

FIG. 1 is a schematic view of a vehicle rear structure 30 showing an application example of the active vibration isolator according to the present embodiment. In FIG. 1, reference numeral 31 is a rear wheel supported by the rear subframe 32 via a rear suspension (not shown).
As shown in FIG. 1, the drive motor or rear differential indicated by reference numeral 34 is supported above the rear subframe 32 via four mounts 33a.
Further, the rear subframe 32 is floatingly supported on the lower portion of a pair of rear side frames (not shown) via four mounts 33b.
The active anti-vibration device of the present embodiment is assumed to be used for these mounts 33a and 33b.

The active anti-vibration device of the present embodiment includes a magnetic viscoelastic elastoma interposed in each of the axial magnetic path and the axial longitudinal magnetic path formed between the inner cylinder and the outer cylinder, and the magnetic viscoelastic elastoma. The main feature is that a flow path of the magnetic viscoelastic fluid is formed, and the magnetic material member faces the flow path so as to form an axial magnetic path and an axial perpendicular magnetic path.

<Active anti-vibration device>
The active anti-vibration device 1 of the present embodiment will be described below.
FIG. 2 is a cross-sectional view of the active vibration isolator 1. FIG. 3 is a sectional view taken along line III-III of FIG. FIG. 4 is a sectional view taken along line IV-IV of FIG. FIG. 5 is a sectional view taken along line VV of FIG. FIG. 6 is a sectional view taken along line VI-VI of FIG.
Of the cross sections shown in FIG. 2, the range AA indicates the AA cross section of FIG. 3, the range BB of FIG. 2 indicates the BB cross section of FIG. 2, and FIG. The range CC shows the respective CC cross sections of FIGS. 5-7.

As shown in FIG. 2, the active vibration isolator 1 includes an inner cylinder 2 and an outer cylinder 3 arranged coaxially with the inner cylinder 2 on the outer peripheral side of the inner cylinder 2.
The inner cylinder 2 includes a shaft portion 2a and a bottomed cylindrical cylinder portion 2b that is coaxially arranged and integrated with the shaft portion 2a. The tubular portion 2b is formed to be shorter in the axial direction than the shaft portion 2a and have a larger diameter than the shaft portion 2a.

Further, the bottom portion of the cylinder portion 2b through which the shaft portion 2a penetrates is arranged near the end portion of the outer cylinder 3. A magnetic member 12 to be described later is integrally formed on the opening side of the cylinder portion 2b in a flange shape extending to the outer cylinder 3 side.
A liquid chamber 5 filled with a magnetic viscoelastic fluid, which will be described later, is formed between the inner cylinder 2 and the outer cylinder 3.
The inner cylinder 2 in the present embodiment is assumed to be made of an iron-based metal. Further, the outer cylinder 3 in the present embodiment is assumed to be made of a non-magnetic metal such as an aluminum alloy or stainless steel.

An elastic member 4 made of synthetic rubber or the like is arranged on one end side (upper side of the paper surface in FIG. 2) in the axial direction between the inner cylinder 2 and the outer cylinder 3. Further, an elastic member 4 made of synthetic rubber or the like is also arranged on the other end side (lower side of the paper surface in FIG. 2) in the axial direction between the inner cylinder 2 and the outer cylinder 3.
These elastic members 4 are vulcanized and adhered to the inner cylinder 2 and the outer cylinder 3. As a result, the liquid chamber 5 formed between the inner cylinder 2 and the outer cylinder 3 is liquidtightly sealed at both ends in the axial direction by the elastic member 4.

Such a liquid chamber 5 has a first liquid chamber 5a formed on one end side in the axial direction and a second liquid chamber 5b formed on the other end side in the axial direction. The first liquid chamber 5a and the second liquid chamber 5b communicate with each other via the flow path 17 of the magnetic viscoelastic fluid described later.

As shown in FIG. 3, the elastic member 4 arranged on one end side in the axial direction (upper side of the paper surface in FIG. 2) has a partition portion 6a described below.
The partition portion 6a of the elastic member 4 is formed in a substantially fan shape that spreads at a predetermined angle toward the outside in the radial direction in the plan view shown in FIG.

The partition portions 6a are arranged at predetermined intervals in the circumferential direction of the first liquid chamber 5a. Incidentally, although two partition portions 6a in the present embodiment are arranged at intervals of 180 degrees, there is no particular limitation on the number of partition portions 6a. Such a partition portion 6a divides the first liquid chamber 5a equally in the circumferential direction.
As shown in the cross section in the range of AA in FIG. 2, the partition portion 6a extends axially to the bottom surface of the concave first magnetic material member 12a in the cross-sectional view described later, and the first liquid chamber 5a Is divided into two.

Further, as shown in FIG. 4, the elastic member 4 arranged on the other end side in the axial direction (lower side of the paper surface in FIG. 2) also has a substantially fan-shaped partition portion 6b. The second liquid chamber 5b is equally divided (divided into two) in the circumferential direction by the partition portion 6b.
However, as shown in FIG. 2, the partition portion 6b is longer in the axial direction than the partition portion 6a.
Further, the partition portion 6a and the partition portion 6b are offset from each other in the circumferential direction as shown in FIGS. 3 and 4. Specifically, the partition portion 6b is shifted in phase by 90 degrees in the circumferential direction (around the axis) from the partition portion 6a.
The shapes of the partition portions 6a and 6b are not particularly limited as long as the liquid chamber 5 can be divided in the circumferential direction, and may be composed of a plurality of plates arranged radially from the inner cylinder 2 side.

Next, the exciting coil 11 (see FIG. 2) will be described.
As shown in FIG. 2, the exciting coil 11 is arranged between the shaft portion 2a and the cylinder portion 2b constituting the inner cylinder 2.
That is, as shown in FIG. 4, the exciting coil 11 is wound in a cylindrical shape on the outer peripheral side of the shaft portion 2a. Specifically, the exciting coil 11 is wound around a cylindrical bobbin (not shown) and inserted between the shaft portion 2a and the tubular portion 2b.
Such an exciting coil 11 cooperates with the magnetic material member 12 (see FIG. 2) described below to provide an axial magnetic path 20b (see FIG. 2) and an axial direct magnetic path 20a (see FIG. 2), which will be described later. And form.

As shown in FIG. 2, the magnetic material member 12 includes a first magnetic material member 12a and a second magnetic material member 12b. Examples of the magnetic member 12 include those made of an iron-based metal.
The first magnetic material member 12a is formed of a substantially bottomed cylinder having a low height in the axial direction. The outer diameter of the first magnetic material member 12a is formed according to the inner diameter of the outer cylinder 3 and is fitted inside the outer cylinder 3. Specifically, the opening peripheral edge of the first magnetic material member 12a is fitted so as to overlap in the radial direction inside the opening peripheral edge of the outer cylinder 3.

Further, a circular opening 13 in which the shaft portion 2a of the inner cylinder 2 and the magnetic viscoelastic elastomer 21 described later are arranged is formed in the central portion of the bottom portion of the first magnetic material member 12a.
As shown in FIG. 3, the first liquid chamber 5a partitioned by the partition portion 6a of the elastic member 4 is formed inside the first magnetic material member 12a.

As shown in FIG. 2, the second magnetic material member 12b is formed in a flange shape on the opening side of the cylinder portion 2b of the inner cylinder 2 and extends to the outer cylinder 3 side.
Such a second magnetic material member 12b is arranged so as to be separated from the bottom of the first magnetic material member 12a at a predetermined distance in the axial direction.
A part of the bottom of the first magnetic material member 12a and the second magnetic material member 12b overlap each other in the axial direction.

As shown in FIG. 2, such a magnetic member 12 forms an axial magnetic path 20b and an axial perpendicular magnetic path 20a by an energized exciting coil 11.
Specifically, the exciting coil 11 forms a magnetic flux MF that flows through the shaft portion 2a, the cylinder portion 2b, the second magnetic material member 12b, and the first magnetic material member 12a of the inner cylinder 2 and returns to the shaft portion 2a again. do.
Due to this magnetic flux MF, an axial magnetic path 20b is formed between the first magnetic material member 12a and the second magnetic material member 12b, and a shaft is formed between the first magnetic material member 12a and the shaft portion 2a of the inner cylinder 2. A direct magnetic path 20a is formed.

Next, the magnetic viscoelastic elastomer 21 (see FIG. 2) will be described.
As shown in FIG. 2, the magnetic viscoelastic elastomer 21 includes the shafts of the first magnetic material member 12a and the inner cylinder 2 shown in the range of CC in FIG. 2, except for the flow path 17 of the magnetic viscoelastic fluid described later. It is filled between the portion 2a, between the outer cylinder 3 and the shaft portion 2a of the inner cylinder 2, and between the outer cylinder 3 and the second magnetic material member 12b.
As a result, the magnetic viscoelastic elastomer 21 is interposed in each of the axial magnetic path 20b and the axial perpendicular magnetic path 20a.
The flow path 17, which will be described in detail later, is the first axial passage 15a shown in FIGS. 2 and 6, the axial longitudinal passage 16 shown in FIGS. 2 and 5, and the second passage shown in FIGS. 2 and 7. It consists of a biaxial passage 15b.

Such a magnetic viscoelastic elastomer 21 is composed of a substrate elastomer having viscoelasticity as a matrix and magnetic particles contained in the substrate elastomer.
In the magnetic viscoelastic elastoma 21 of the present embodiment, as shown in FIG. 2, the magnetic particles 23 face the axial magnetic path 20b and the axial perpendicular magnetic path 20a.
Specifically, the magnetic viscoelastic elastoma 21 has a first alignment portion 21a in which the magnetic particles 23 are oriented along the axial perpendicular magnetic path 20a and a second alignment portion 21a in which the magnetic particles 23 are oriented along the axial magnetic path 20b. The alignment portion 21b and the like are provided.

The substrate elastomer of such a magnetic viscoelastic elastomer 21 is particularly limited as long as it has fluidity in an uncured elastomer raw material and becomes an elastic body by vulcanization (crosslinking). However, known ones can be used. Specific examples of the substrate elastomer include, but are not limited to, urethane rubber, silicone rubber, and the like, and known rubber-like polymer materials having viscoelasticity at room temperature can be used.

Further, the substrate elastoma may contain, if necessary, a liquid rubber such as terminal carboxyl-modified butadiene-acrylonitrile rubber, an epoxy-modified butadiene-acrylonitrile rubber, and an elasticity adjusting agent such as other oil components. As the cross-linking agent (vulcanizing agent) for curing the elastomer raw material, the heating temperature, and the like, known conditions according to the type of the substrate elastomer selected can be applied.

The magnetic particles include, for example, pure iron, electromagnetic soft iron, directional silicon steel, Mn-Zn ferrite, Ni-Zn ferrite, magnetite, cobalt, nickel and other metals, 4-methoxybenziliden-4-acetoxyaniline, triaminobenzene weight. Examples thereof include organic compounds such as coalesced organic compounds and organic / inorganic composites such as ferrite dispersion anisotropic plastics, but the present invention is not limited to these, and particles made of known materials that are magnetically polarized by the action of a magnetic field can be used. can.

As shown in FIG. 2, a flow path 17 of a magnetic viscoelastic fluid is formed in the magnetic viscoelastic elastomer 21 as described above. As described above, this flow path 17 communicates the first liquid chamber 5a and the second liquid chamber 5b.

The flow path 17 is composed of the axial direct passage 16 shown in FIGS. 2 and 5, the first axial passage 15a shown in FIGS. 2 and 6, and the second axial passage 15b shown in FIGS. 2 and 7. It is configured.
Then, as shown in FIG. 2, the first axial passage 15a communicates the axial longitudinal passage 16 with the first liquid chamber 5a, and the second axial passage 15b communicates the axial longitudinal passage 16 and the second liquid. It communicates with the room 5b.

Further, as shown in FIGS. 2, 6 and 7, the first axial passage 15a and the second axial passage 15b are offset from each other in the axial direction.
The axial direct passage 16 shown in FIG. 5 is wider in the circumferential direction than the first axial passage 15a shown in FIG. 6 and the second axial passage 15b shown in FIG. 7, and the flow path chamber 19 is formed. Is forming.

As shown in FIG. 2, a magnetic material member 12 faces the flow path 17 of such a magnetic viscoelastic elastoma 21 so as to form an axial magnetic path 20b and an axial perpendicular magnetic path 20a.
Specifically, an axial direct magnetic path 20a is formed between the first magnetic material member 12a and the shaft portion 2a of the inner cylinder 2 so as to cross the first axial passage 15a. Then, an axial magnetic path 20b is formed between the first magnetic material member 12a and the second magnetic material member 12b so as to cross the axial longitudinal passage 16.

Next, the operation of the active vibration isolator 1 (see FIG. 2) of the present embodiment will be described.
FIG. 8 is an operation explanatory diagram of the active vibration isolator 1 when the vibration amplitude a is input to the inner cylinder 2 in the axial direction. FIG. 9 is an operation explanatory diagram of the active vibration isolator 1 when the vibration amplitude a is input to the inner cylinder 2 in the direction perpendicular to the axis.

As shown in FIG. 8, when the vibration amplitude a is input to the inner cylinder 2 in the axial direction, the inner cylinder 2 is displaced relative to the outer cylinder 3 in the axial direction (the input direction of the vibration amplitude a). As a result, the elastic member 4 and the magnetic viscoelastic elastomer 21 are elastically deformed so as to be inclined in the input direction of the vibration amplitude a.
The elastically deformed elastic member 4 and the magnetic viscoelastic elastomer 21 exhibit an anti-vibration effect due to their internal viscosities.

On the other hand, where a shearing force acts in the axial direction on the first alignment portion 21a of the magnetic viscoelastic elastoma 21 arranged in the axial perpendicular magnetic path 20a, the magnetic particles 23 oriented in the axial longitudinal magnetic path 20a The rigidity of the first alignment portion 21a is increased according to the strength of the magnetic field.
That is, the active vibration isolator 1 can increase the rigidity in the axial direction according to the magnitude of the current of the excitation coil 11.

As shown in FIG. 9, when the vibration amplitude a is input in the direction perpendicular to the axis with respect to the inner cylinder 2, the one-sided half body in the input direction of the elastic member 4 sandwiching the inner cylinder 2 and the magnetic viscoelastic elastoma 21 in the input direction. Is stretched and elastically deformed so that the other half of the body in the input direction contracts.
The elastically deformed elastic member 4 and the magnetic viscoelastic elastomer 21 exhibit an anti-vibration effect due to their internal viscosities.

On the other hand, a shearing force acts in the second orientation portion 21b of the magnetic viscoelastic elastoma 21 arranged in the axial magnetic path 20b, and the magnetic particles 23 oriented in the axial magnetic path 20b have a magnetic field. The rigidity of the second alignment portion 21b is increased according to the strength of the second alignment portion 21b.
That is, the active vibration isolator 1 can increase the rigidity in the axial direction according to the magnitude of the current of the exciting coil 11.

Further, in the active vibration isolator 1, as shown in FIG. 2, when the vibration amplitude a is input in the axial direction and / or the axial direction with respect to the inner cylinder 2, the relative position between the inner cylinder 2 and the outer cylinder 3 is obtained. Is displaced. As a result, the magnetic viscoelastic fluid flows between the first liquid chamber 5a and the second liquid chamber 5b via the flow path 17.

On the other hand, by energizing the exciting coil 11, as described above, an axial linear magnetic path 20a that crosses the first axial passage 15a is formed, and an axial magnetic path that crosses the axial longitudinal passage 16 is formed. 20b is formed.

Then, the magnetic viscoelastic fluid itself becomes more viscous in a magnetic field and causes flow resistance in the liquid chamber. Further, the magnetic viscoelastic fluid is along the magnetic flux MF when the axial linear magnetic path 20a and the axial magnetic path 20b are formed so as to intersect the first axial passage 15a and the axial longitudinal passage 16, respectively. By arranging magnetic particles (not shown), a valve that blocks the flow path 17 is formed. This causes the magnetic viscoelastic fluid to generate flow resistance in the flow path 17.

Such a magnetic viscoelastic fluid may have fluidity in a state where a magnetic field is not applied, and for example, MRF (Magneto-Rheological Fluid), MRC (Magneto-Rheological Compound) or the like can be used. can.
Specific examples of the magnetic viscoelastic fluid (MRF, MRC) include those containing magnetic particles and a dispersion medium of the magnetic particles.
Examples of the magnetic particles include the same magnetic particles contained in the magnetic viscoelastic elastomer 21.
The dispersion medium may be any medium as long as it can disperse magnetic particles, and examples thereof include mineral oil and synthetic oil.

<Manufacturing method of active anti-vibration device>
Next, a method of manufacturing the active vibration isolator 1 (see FIG. 2) according to the present embodiment will be described. 10 (a) and 10 (b) are manufacturing process diagrams of the active vibration isolator 1 (see FIG. 2).
As shown in FIG. 10A, in this manufacturing method, in the outer cylinder 3 having the first magnetic material member 12a, the inner cylinder 2 having the exciting coil 11 and the second magnetic material member 12b is a predetermined skirting board. Arranged via 24.

Incidentally, in this skirting board 24, the space portion 26a filled with the uncured magnetic viscoelastic elastomer, which will be described later, is partitioned from the inner cylinder 2 and the inner cylinder 2 is supported at a predetermined position of the outer cylinder 3.
Further, the skirting board 24 forms a part of the second liquid chamber 5b (see FIG. 2) by being removed from the outer cylinder 3 after the uncured magnetic viscoelastic elastomer is cured.
Further, in this step, the core 25 imitating the flow path 17 (see FIG. 2) is arranged between the first magnetic material member 12a and the second magnetic material member 12b. The core 25 is supported at a predetermined position in the outer cylinder 3 via the baseboard 24.

Further, in this manufacturing method, the space portion 26a in the outer cylinder 3 is uncured except for the space portion 26b in which the liquid chamber 5 (see FIG. 2) and the elastic member 4 (see FIG. 2) are arranged. A magnetic viscoelastic elastomer is introduced.
Specifically, it is introduced from the circular opening 13 at the bottom of the first magnetic material member 12b shown in FIG. 10 (a).

Next, in this manufacturing method, as shown in FIG. 10B, the lid 28 having the degassing hole 27 communicating with the uncured magnetic viscoelastic elastomer filled in the space 26a is the first magnetic member 12b. Placed at the bottom.
In this manufacturing method, the magnetic particles contained in the uncured magnetic viscoelastic elastoma along the axial magnetic path 20b and the axial perpendicular magnetic path 20a formed by energizing the exciting coil 11 (not shown). The magnetic viscoelastic elastoma is cured while orienting.
As a result, as shown in FIG. 10 (b), the first alignment portion 21a and the second alignment portion 21b are formed on the magnetic viscoelastic elastomer 21.

Although not shown, the flow path 17 (FIG. 10 (b)) is formed in the magnetic viscoelastic elastomer 21 by removing the core 25 from the outer cylinder 3 (FIG. 10 (b)).
The first magnetic material member 12a and the second magnetic material member 12b face such a flow path 17.

Next, in this manufacturing method, although not shown, the elastic member 4 (see FIG. 2) seals between the inner cylinder 2 (see FIG. 2) and the outer cylinder 3 (see FIG. 2). A liquid chamber 5 (see FIG. 2) is formed. Then, when the liquid chamber 5 and the flow path 17 are filled with the magnetic viscoelastic fluid, a series of steps of this manufacturing method is completed.
The liquid chamber 5 and the like can be filled with the magnetic viscoelastic fluid from a predetermined hole (not shown) provided in the outer cylinder 3. Then, this hole is closed after filling with the magnetic viscoelastic fluid.

<Action effect>
Next, the action and effect of the active vibration isolator 1 of the present embodiment will be described.
In the active type anti-vibration device 1 of the present embodiment, the magnetic viscoelastic elastoma 21 is arranged in the axial perpendicular magnetic path 20a and the axial magnetic path 20b.
According to such an active vibration isolator 1, the rigidity can be made variable so as to correspond to the magnitude of the vibration amplitude input from multiple directions.
Further, in the active vibration isolator 1 of the present embodiment, an axial linear magnetic path 20a and an axial magnetic path 20b are formed in a direction intersecting the flow path 17 of the magnetic viscoelastic fluid.
According to such an active vibration isolator 1, the damping characteristic can be made variable so as to correspond to the magnitude of the vibration amplitude input from multiple directions.
Further, in the active vibration isolator 1 of the present embodiment, since the flow path 17 of the magnetic viscoelastic fluid is formed in the magnetic viscoelastic elastomer 21, the flow path 17 is formed separately from the magnetic viscoelastic elastomer 21. Differently, the active vibration isolator 1 can be made compact.

When this active vibration isolator 1 is used for the mounts 33a, 33b, etc. of the rear subframe 32, the magnetic flux density generated in the exciting coil 11 is increased, so that the stability against lateral G when the vehicle is steered is increased. Can be improved.
Further, according to the active vibration isolator 1, the vibration convergence can be improved by increasing the magnetic flux density generated in the exciting coil 11 when the vehicle gets over the protrusion on the road surface.

Further, the active vibration isolator 1 can improve the blocking property of road noise by suppressing the magnetic flux density generated in the exciting coil 11 to be low when the vehicle travels on a rough road surface at a constant speed.

Further, in the active anti-vibration device 1 of the present embodiment, the first magnetic material member 12a and the second magnetic material member 12b are arranged apart from each other in the axial direction, and a part thereof overlaps in the axial direction. There is.
According to such an active vibration isolator 1, the axial magnetic path 20b and the axial direct magnetic path 20a can be formed more reliably.

Further, in the active vibration isolator 1 of the present embodiment, the first axial passage 15a and the second axial passage 15b are offset from each other in the axial direction.
According to such an active vibration isolator 1, the length of the flow path 17 formed in the magnetic viscoelastic elastomer 21 can be increased, so that the damping of the vibration amplitude can be further improved.

Further, in the active vibration isolator 1 of the present embodiment, the axial longitudinal passage 16 forms a flow path chamber 19 wider in the circumferential direction than the first axial passage 15a and the second axial passage 15b. ing.
According to such an active vibration isolator 1, the facing area between the first magnetic material member 12a and the second magnetic material member 12b is further expanded by forming a wide flow path chamber 19 in the circumferential direction. Can be done. As a result, the active vibration isolator 1 can further improve the damping of the vibration amplitude. Further, in the active vibration isolator 1, the flow of the magnetic viscoelastic fluid becomes substantially orthogonal to the direction of the magnetic flux due to the formation of the wide flow path chamber 19 in the circumferential direction. As a result, the active vibration isolator 1 can further improve the damping of the vibration amplitude.

Further, in the active vibration isolator 1 of the present embodiment, the partition portion 6a for partitioning the first liquid chamber 5a and the partition portion 6b for partitioning the second liquid chamber 5b are offset from each other in the circumferential direction.
According to such an active vibration isolator 1, even when a vibration amplitude is generated in the axial direction, the magnetic viscoelastic fluid can be sent to the flow path 17, and the vibration amplitude in the axial direction is attenuated. Can be done efficiently. That is, the active vibration isolator 1 can attenuate both the vibration amplitude in the axial direction and the vibration amplitude in the axial direction.
Further, in the active vibration isolator 1, since the partition portion 6a and the partition portion 6b are offset in the axial direction, the moving distance of the magnetic viscoelastic fluid in the flow path 17 can be lengthened. As a result, the active vibration isolator 1 can improve the damping force of the vibration amplitude.

Further, in the active anti-vibration device 1 of the present embodiment, the magnetic viscoelastic elastoma 21 is provided on the first alignment portion 21a in which the magnetic particles 23 are oriented along the axial magnetic path 20b and on the axial perpendicular magnetic path 20a. A second alignment portion 21b, in which the magnetic particles 23 are oriented along the line, is provided.
According to such an active vibration isolator 1, it is possible to secure the rigidity against the vibration amplitude in the axial direction and the axial direction. Further, since the magnetic particles 23 are oriented, the rigidity when the exciting coil 11 is energized can be further improved.

Further, in the method for manufacturing the active vibration isolator 1 of the present embodiment, the magnetic viscoelastic elastomer 21 is formed by using the outer cylinder 3 as a mold.
According to such a manufacturing method, the manufacturing process can be simplified.
Further, in such a manufacturing method, the magnetic particles 23 of the magnetic viscoelastic elastomer 21 are oriented by using the exciting coil 11.
According to such a manufacturing method, the magnetic path formed when the active vibration isolator 1 is used and the magnetic path for orienting the magnetic particles 23 match, so that the active vibration isolator exhibits the desired performance. The device 1 can be constructed with good reproducibility.

Although the present embodiment has been described above, the present invention is not limited to the above-described embodiment and can be implemented in various forms.
In the above embodiment, the active type vibration isolator 1 having the exciting coil 11 in the inner cylinder 2 has been described, but the exciting coil 11 can also be provided in the outer cylinder 3.

1 Active anti-vibration device 2 Inner cylinder 3 Outer cylinder 4 Elastic member 5 Liquid chamber 5a 1st liquid chamber 5b 2nd liquid chamber 6a Partition 6b Partition 11 Exciting coil 12 Magnetic member 12a 1st magnetic member 12b 2nd Magnetic member 15 Axial passage 16 Axial direct passage 17 Flow path 20a Axial direct magnetic path 20b Axial magnetic path 21 Magnetic viscoelastic elastoma 21a 1st alignment part 21b 2nd alignment part 23 Magnetic particles

Claims (7)

Inner cylinder and
An outer cylinder arranged coaxially with the inner cylinder on the outer peripheral side of the inner cylinder,
A liquid chamber formed between the inner cylinder and the outer cylinder,
An elastic member that tightly seals between the inner cylinder and the outer cylinder at both ends in the axial direction so that the magnetic viscoelastic fluid is held in the liquid chamber.
An exciting coil arranged in either the inner cylinder or the outer cylinder to generate a magnetic field,
A magnetic material member that forms an axial magnetic path and an axial perpendicular magnetic path by the exciting coil, and
A magnetic viscoelastic elastoma that is interposed in each of the axial magnetic path and the axial perpendicular magnetic path and contains magnetic particles facing the axial magnetic path and the axial perpendicular magnetic path, and a magnetic viscoelastic elastoma.
Equipped with
A flow path of the magnetic viscoelastic fluid is formed in the magnetic viscoelastic elastomer.
An active anti-vibration device characterized in that the magnetic material member faces the flow path so as to form an axial magnetic path and an axial perpendicular magnetic path in the flow path. The magnetic material member is
A first magnetic material member that extends toward the inner cylinder side or the outer cylinder side that does not have the exciting coil so as to form a flange from the inner cylinder having the exciting coil or one end side of the outer cylinder and faces the liquid chamber. When,
A second magnetic material member that extends from the inner cylinder or the outer cylinder and faces the liquid chamber so as to face the first magnetic material member in the axial direction.
Equipped with
The active type defense according to claim 1, wherein the first magnetic material member and the second magnetic material member are arranged apart from each other in the axial direction, and a part thereof overlaps with each other in the axial direction. Shaking device. The liquid chamber includes a first liquid chamber and a second liquid chamber on the outer side in the axial direction when the flow path is viewed from the inside.
The flow path is a second axial passage, a first axial passage that communicates the axial vertical passage and the first liquid chamber, and a second passage that communicates the axial vertical passage and the second liquid chamber. With an axial passage,
The active vibration isolator according to claim 1, wherein the first axial passage and the second axial passage are offset from each other in the axial direction. The active according to claim 3, wherein the axial longitudinal passage is wider in the circumferential direction than the first axial passage and the second axial passage to form a channel chamber. Type anti-vibration device. On the side of the elastic member facing the liquid chamber, a partition portion for partitioning the liquid chamber in the circumferential direction is provided, and each of the liquid chambers partitioned by the partition portion communicates with the flow path.
The partition portion of the elastic member arranged on one end side in the axial direction and the partition portion of the elastic member arranged on the other end side in the axial direction are offset from each other in the circumferential direction. The active anti-vibration device according to claim 1. The magnetic viscoelastic elastomer is
The first alignment portion where the magnetic particles are oriented along the axial magnetic path, and
The active vibration isolator according to claim 1, further comprising a second alignment portion in which magnetic particles are oriented along the axially perpendicular magnetic path. The method for manufacturing an active vibration isolator according to claim 1.
A step of arranging the exciting coil, the magnetic material member, the core imitating the flow path, and the inner cylinder at a predetermined position in the outer cylinder.
A step of introducing an uncured magnetic viscoelastic elastomer into the space inside the outer cylinder except for the space where the liquid chamber and the elastic member are arranged.
The uncured magnetic viscous while orienting the magnetic particles contained in the uncured magnetic viscoelastic elastoma along the axial magnetic path and the axial perpendicular magnetic path formed by energizing the exciting coil. The process of curing the elastic elastoma and
A step of forming the flow path in the cured magnetic viscoelastic elastomer by removing the core from the inside of the outer cylinder, and a step of forming the flow path.
A step of sealing between the inner cylinder and the outer cylinder with the elastic member to form the liquid chamber and filling the liquid chamber and the flow path with the magnetic viscoelastic fluid.
A method for manufacturing an active anti-vibration device.

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