JPH0570007B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a fluid-filled vibration damping support device, and more particularly to a vibration damping support device that can arbitrarily change spring characteristics and damping characteristics according to vibration input. The present invention relates to a mounting device interposed between an automobile body and a power unit.

(Background technology) Conventionally, a structure has been adopted in which a vibration-proof structure is installed between two members through which vibrations are transmitted, and provides vibration-proof support for these members. When attaching a power unit to a vehicle body, a mount or mount is installed to support the power unit, suppress transmission of vibration input from the engine and vibration input from the road surface during driving, and attenuate or prevent vibration. The structure is such that a mounting device is interposed between the power unit and the vehicle body.

Therefore, during engine shake (resonance state of the engine mass and mount spring system) while the car is running, or during sudden torque fluctuations such as when starting suddenly or accelerating, the vibration frequency will increase from 10Hz to 25Hz.
In order to suppress the vibration or movement of the power unit, it is desirable to use a mount function with high damping and high spring characteristics.On the other hand, when idling or driving at high speed, the frequency of vibration is approximately 15Hz.
In order to reduce the transmission rate of vibration input from the power unit to the vehicle body, which is around 30Hz, it is desirable to have a mounting function with low spring characteristics, but conventional mounting devices have not necessarily met this requirement. It wasn't something to be gained.

In other words, there is a conventional mounting structure in which an insulator rubber is interposed between two mounting fittings, and a mounting structure in which two fluid chambers are provided inside the vibration-proof rubber, as seen in Japanese Patent Application Laid-open No. 55-107142. In the case of a fluid-filled vibration isolator (vibration isolator support device) that exhibits a desired damping effect by flowing a predetermined fluid through an orifice that communicates between fluid chambers, one vibration input ,
In other words, the frequency and excitation amplitude are one response spring constant, and the high damping and high spring characteristics for vibrations during shake and start, and the low dynamic spring characteristics for idle vibrations, etc., are achieved in approximately the same frequency and amplitude range. , it is not possible to embody the opposite characteristics, and there is a need for a vibration-proof support device that has dynamic characteristics depending on the driving state of the vehicle.

By the way, as an anti-vibration support device adapted to such vehicle running conditions, for example, Japanese Patent Application Laid-Open No. 1986-
As seen in Publication No. 43026, etc., devices have been devised that use actuators to vary dynamic characteristics, but since there are inevitably moving parts, there is a risk of wear and abnormality of seals and moving parts. There are concerns about the lack of reliability and resentment. In addition, the range of dynamic characteristics that can be achieved by such an actuator is that, although low dynamic spring and low damping characteristics can be achieved when the orifice is open, only high dynamic spring characteristics can be achieved when the orifice is closed. However, there is a problem in that high attenuation characteristics cannot be achieved even if the performance is only realized, and adaptation to the required performance is insufficient.

On the other hand, as seen in Japanese Patent Application Laid-Open No. 58-113644, a magnetic fluid is sealed in two fluid chambers formed in a vibration isolating rubber, and a coil is wound around an orifice that communicates the fluid chambers, and by energization, Anti-vibration support devices have also been disclosed that increase the viscosity of magnetic fluid to adapt it to driving conditions. According to such anti-vibration support devices, there is no actuator.
Although they are superior in that they can adapt to the vehicle's driving conditions simply by the presence or absence of a magnetic field, such conventional anti-vibration support devices using magnetic fluids have little controllability and have variable springs. There is a big problem in the fact that it is not as effective as it should be.

(Structure of the Invention) Here, the fact that there are no moving parts such as actuators and that the dynamic characteristics can be controlled to adapt to the vehicle running conditions is ideal for this type of anti-vibration support device. From this, the inventors
As a result of intensive research on the application of magnetic fluids to such vibration-proof support devices, we found that in flow in a constricted pipe, an alternating magnetic field, that is, a composite magnetic field consisting of a combination of multiple magnetic fields with different magnetic field directions, causes an apparent increase in viscosity. It was discovered that the effect can be effectively brought out with a water-based magnetic fluid, in other words, a water-based magnetic fluid, and based on this knowledge, the present invention was completed.

That is, in the present invention, a first fluid chamber and a second fluid chamber are provided on both sides of a partition member, and the fluid chambers are communicated with each other by an orifice, and at least one of the fluid chambers is connected to the first fluid chamber. A rubber elastic body is provided so as to define a section, and the volume of the fluid chamber is made variable depending on the input vibration, and the fluid sealed in the fluid chamber passes through the orifice in response to the vibration input. In a fluid-filled vibration damping support device that can be moved back and forth between fluid chambers, a water-based magnetic fluid is used as the fluid, and is sealed in the first and second fluid chambers, while applying a magnetic field in a predetermined direction. At least one of the first magnetic field generating means that generates and at least one of the second magnetic field generating means that generates a magnetic field in a direction opposite to that of the first magnetic field generating means are arranged in the flow direction of the magnetic fluid in the orifice. A fluid filled type vibration isolating support device characterized in that the flow of the magnetic fluid in the orifice is controlled by the action of mutually opposite magnetic fields generated by the magnetic field generating means arranged alternately. It is in.

In the fluid-filled vibration damping support device using magnetic fluid according to the present invention, preferably, each of the first magnetic field generating means is perpendicular to the flow direction of the magnetic fluid in the orifice. This generates magnetic fields in opposite directions. It is preferable that the device constitutes a so-called vertical alternating magnetic field device, and each of these magnetic field generating means generates a magnetic field in a direction parallel to the flow direction of the magnetic fluid in the orifice and in mutually opposite directions. There is no problem even if it constitutes a so-called axial alternating magnetic field device.

Further, the first magnetic field generating means and the second magnetic field generating means each include a pair of wound coils arranged to sandwich the orifice,
In addition, the pair of wound coils are configured to generate magnetic fields in the same direction, or the pair of wound coils are configured to have an axis that coincides with the flow direction of the magnetic fluid in the orifice, and a hollow space in the center of the wound coil is formed. A hole will be configured to form part of the orifice.

Furthermore, according to another embodiment of the present invention, the first magnetic field generating means and the second magnetic field generating means each include a permanent magnet that forms a unidirectional magnetic field and is arranged to sandwich the orifice. It may consist of a pair of wound coils arranged outside the permanent magnet and wound in a direction that cancels out the magnetic field of the permanent magnet, or it may have an axis that coincides with the flow direction of the magnetic fluid in the orifice and a central A cylindrical permanent magnet forming a unidirectional magnetic field with a hollow hole forming a part of the orifice, and a wound coil arranged outside the permanent magnet and wound in a direction to cancel the magnetic field of the permanent magnet. It has come to consist of

By the way, according to the studies of the present inventors, in the flow of water-based magnetic fluid in a pipe with a constriction, the constriction part,
In other words, when applying a magnetic field to the orifice of a fluid-filled mount (vibration isolation support device), it is better to apply a magnetic field parallel to the tube axis and have a magnetic field gradient than to apply a uniform magnetic field parallel to the tube axis. The difference between the pressure before and after the throttle is large, and it is better to use an alternating magnetic field parallel to the axis.
It became clear that it was going to get bigger.
The reason for this is that the movement of the spin direction of the ferrite particles in the magnetic fluid, especially the reversal of the spin direction, or the aggregation of the ferrite particles is involved, and an alternating magnetic field with a large magnetic field gradient, that is, a large amount of magnetic field change, is more advantageous. It is speculated that there is. In addition, this pressure difference, conversely, is consistent with the controllability of the anti-vibration support device, that is, when there is no magnetic field, it normally flows as a fluid (for example, water), but when there is a magnetic field, it becomes highly viscous and becomes difficult to flow. Therefore, the pressure difference can be viewed as a substitute value for controllability.

An example of such an alternating magnetic field is shown in FIG. 1, in which a plurality of magnets 4, 4... are arranged so as to sandwich the orifice 2 or to be located around the orifice 2. And the N and S poles of these magnets 4, 4... are arranged so as to face each other, so that each magnet 4 has a magnetic field in the opposite direction as shown by the arrow. An alternating magnetic field is generated. Therefore, by applying alternating magnetic fields with different directions alternately to the flow direction of the magnetic fluid 6 in the orifice 2, the water-based magnetic fluid 6, in other words, water, flowing through the passage 8 is The ferricolloid used as a solvent is affected by its fluidity.

Furthermore, unlike the alternating magnetic field form shown in FIG. It became clear that by applying a magnetic field, a similar effective pressure difference could be observed, which would provide controllability that could withstand practical use.

Based on this knowledge, when we conducted experiments by incorporating such an alternating magnetic field generator into a practical mount, we found that effective controllability was obtained and that the cause corresponding to the closed state of the orifice was due to the alternating magnetic field. It was discovered that this is due to the thickening effect caused by the application of the resin, so that high dynamic spring and high damping characteristics can be achieved at the same time, allowing ideal control to be performed.

(Example) By the way, FIG. 2, FIG. 3, and FIG. 4 show an engine mount as a fluid-filled vibration damping support device having an orifice structure and a magnetic field configuration, which was considered in the present invention. , in those figures, FIG. 2 is a comparative example of a conventional structure in which only a magnetic field is formed in one direction in the fluid flow direction, and FIGS. 3 and 4 are comparative examples in which an alternating magnetic field is formed according to the present invention, respectively. It was designed so that

In addition, in these engine mounts, a substantially truncated conical rubber block 12 is attached to two mounting brackets 1.
A first fluid chamber 20 partitioned by a partition member 18 is formed inside the rubber block 12, and a first fluid chamber 20 partitioned by a partition member 18 is formed in the rubber block 12. A diaphragm 22 is provided on the side opposite to the one fluid chamber 20.
A variable volume second fluid chamber 24 is formed. Of course, the first fluid chamber 20
The capacity of the rubber block 12 is made variable by deformation of the rubber block 12 due to vibration input. A predetermined water-based magnetic fluid is sealed in these two fluid chambers 20 and 24, and can be attached to the power unit side member and the vehicle body side member, respectively, via the respective mounting brackets 14 and 16. It's getting old. Note that a protective cap 28 is provided on the outside of the diaphragm 22.

As is clear from the figure, the partition member 18 that partitions the first fluid chamber 20 and the second fluid chamber 24 is constructed by overlapping an upper plate 30 and a lower plate 32. Upper plate 30 and lower plate 3
The first fluid chamber 20
An orifice (throttled portion) 34 having a relatively elongated (flat) rectangular cross section is formed to communicate the fluid chamber 24 with the second fluid chamber 24 .

In addition, the partition member 18 having such a structure includes:
In order to control the flow of the magnetic fluid 26 flowing through the orifice 34 formed therein, a coil configured to be supplied with power from the outside will be provided. In the comparative example, a wound coil 36 having a structure in which a coil is simply wound around an orifice 34 is arranged, and a hollow hole in the center thereof is arranged around the orifice 34.
A magnetic field is simply formed in one direction as shown by the arrow by external power supply.

On the other hand, in the apparatus shown in FIGS. 3 and 4 according to the present invention, a pair of winding coils 40a and 40b are arranged above and below so as to sandwich the orifice 34, and one of the first magnetic field generating means is It consists of one
The pair of wound coils 40a and 40b generate a magnetic field in the same direction, that is, in the upward direction indicated by the arrow in the figure. Also,
With respect to the first magnetic field generating means (40a, 40b), wound coils 42a, 42b arranged in the flow direction of the orifice 34 magnetic fluid and having the same arrangement as the first magnetic field generating means (40a, 40b) are arranged above and below, respectively. The second magnetic field generating means is provided with a pair of wound coils 42a, 42b arranged in a direction opposite to the magnetic field direction of the first magnetic field generating means. It is configured to generate a magnetic field in the same downward direction as shown by the arrows in the figure.

In addition, such winding coils 40a, 40b, 42
Both a and 42b are constructed by winding a coil around a predetermined bobbin, and an iron core 44 inserted into the center thereof is arranged to face each other. In addition, those coils arranged on the same side, that is, the upper coil 40
a and 42a, and lower coils 40b and 42b are integrally molded into a block shape from a suitable resin, and are accommodated and held in recesses in the upper plate 30 and lower plate 32.

In short, as shown in FIGS. 3 and 4, the first magnetic field generating means is composed of a pair of wound coils 40a and 40b, and the other pair of wound coils 42
The alternating magnetic field with different magnetic field directions generated by the second magnetic field generating means constituted by a and 42b is formed as a magnetic field in a direction perpendicular to the flow direction of the magnetic fluid 26 in the orifice 34. In the device shown in the figure, an iron core 44 is used at the center of the coil, so the magnetic field suddenly becomes stronger only at the bottom of the iron core 44, and the magnetic field is formed by a pair of adjacent wound coils. is oriented perpendicular to the direction opposite to the magnetic field created by the iron core. Further, in the device shown in FIG. 4, unlike the I-shaped iron core 44 shown in FIG. 3, a T-shaped iron core 46 is used.
The feature is that the magnetic field formation area at the head of No. 6 is widened.

In engine mounts with these structures, when power is supplied from the outside to each wound coil 36 or a pair of wound coils 40a, 40b; The dynamic characteristics of the engine mount according to the invention shown in FIG. The result is the fifth
As shown in Fig. 6 and Fig. 6, respectively, it is clear from these figures that simply applying an axial magnetic field in one direction as shown in Fig. 2 will not increase the voltage of the coil and strengthen the magnetic field. However, effective controllability cannot be obtained. In contrast, in the structure of FIG. 3 according to the present invention, the orifice 34
When a vertical alternating magnetic field is applied to the flowing magnetic fluid 26, the vibration transmission force characteristics are changed by increasing the coil voltage, in other words, the dynamic spring characteristics are changed, and a good It can be seen that controllability is being demonstrated.

Further, in order to enhance the effect of such an alternating magnetic field, it is sufficient to arrange a large number of first and second magnetic field generating means for forming such an alternating magnetic field alternately in the flow direction of the magnetic fluid in the orifice. Since the controllability increases in accordance with the increase in the number of pairs of wound coils constituting the generating means, in the engine mount shown in FIG. A circumferential orifice 34 is formed in the circumferential orifice 34, and above and below the circumferential orifice 34, a pair of wound coils 40a and 40b constituting the first magnetic field generating means are arranged.
and a pair of wound coils 42a and 42b constituting the second magnetic field generating means are arranged alternately.

More specifically, as shown in FIGS. 8a and 8b, round coils 40a, 42a;
2b can be inserted, five round holes 47 are opened so as to be located on the same circumference, and the positions are set at positions corresponding to six divisions of the circle, and in the sixth division, Orifice 34 and first fluid chamber 2
It has a structure in which a guide port 48 to the zero or second fluid chamber 24 is formed. Also, orifice 3
4 increases the effectiveness of the magnetic field by overlapping orifice grooves 50, 50 formed on opposing surfaces of the upper plate 30 and lower plate 32 at a depth that opens at the bottoms of the five holes 46. The winding coils 40a, 40b; 42a, 42b are each formed in a flat rectangular shape.
An umbrella-shaped iron core 52 is embedded in each so that the umbrella part is located on the orifice 34 side, and a magnetic field is formed between the upper and lower iron cores 52, 52, and also forms part of the wall surface of the orifice 34. I'm starting to do that. Moreover, the five pairs of wound coils 40a, 40b; 42a, 42b installed in this way are wound in such a way that a unidirectional magnetic field is formed between the iron cores 52, 52 in each pair, that is, the coils are wound in the same manner. The coils are configured to wind in opposite directions, and reverse unidirectional magnetic fields are alternately formed between the pairs of coils as windings in opposite directions. Note that in this embodiment, the upper plate 3
0. Two support plates 53, 53 are provided so as to sandwich the lower plate 32.

These first magnetic field generating means (40a, 40b)
In an engine mount equipped with an alternating magnetic field generating mechanism formed by alternately combining magnetic field generators and second magnetic field generating means (42a, 42b), the operation mode is such that the coil is not energized during idling, and the original water-based magnetic fluid is used. The orifice 34 is configured such that the dynamic characteristics of only the fluid component are exhibited, and the orifice 34 is
As with normal fluid-filled mounts, the vibration frequency for the lowest dynamic spring is adjusted to match the idle frequency, while the coil is energized to prevent vibrations when starting or shaking. By doing so, the flow of the magnetic fluid 26 through the orifice 34 is controlled so that the mount as a whole exhibits high dynamic spring and high damping characteristics. Note that the coil 40 is adjusted according to such vehicle running conditions.
Control of energization to a, 40b; 42a, 42b is as follows:
For example, this can be easily done by detecting the running state of the vehicle with an appropriate sensor and controlling the power supply with a control device based on the detection signal.

In addition, in the fluid-filled vibration damping support device according to the present invention, in addition to controlling the flow of the magnetic fluid in the orifice 34 by the first and second magnetic field generating means as described above, the first fluid chamber 20 and the Second fluid chamber 24
A pressure relief means, such as a movable plate or a movable membrane, is provided between the two fluid chambers to prevent or suppress an increase in the pressure in at least one of the fluid chambers caused by vibration input, and when high frequency vibration is input, A structure designed to improve the vibration damping characteristics can also be advantageously employed, and an example thereof is shown in FIGS. 9 and 10.

That is, in FIG. 9, the partition member 18
has a large hole 54 in its center, while a cavity with a predetermined gap is formed at the bottom of the hole 54, that is, in the lower plate 32 part, and the movable plate 5 is provided in the cavity.
The action holes 58a and 58 are arranged so that the pressures of the first fluid chamber 20 and the second fluid chamber 24 act on both sides of the movable plate 56, respectively.
b are provided on the walls of the respective spaces. In addition, in the engine mount shown in FIG. 10, a hole 60 is provided in the center of the partition member 18, and a hole 60 is inserted through the hole 60 so that the partition member 18 is sandwiched therebetween. The structure includes a movable member 62 that can be moved a predetermined distance.

In the engine mount according to the present invention which is provided with such a movable plate 56 and movable member 62, the movement of the movable plate 56 or movable member 62 reduces the amount of fluid inside the first fluid chamber 20 when vibration is input. The pressure increase is effectively avoided, and thereby, as is well known, the vibration damping effect when high frequency vibrations occur can be effectively achieved.

Furthermore, in the engine mount according to another example of the fluid-filled vibration damping support device according to the present invention shown in FIG. 47
Inside, disc-shaped permanent magnets 64a, 64b; 66
a and 66b are arranged to form the upper and lower walls of the orifice 34, thereby sandwiching the orifice 34 therebetween. And permanent magnet 64 of such a combination
a, 64b and 66a, 66b are alternately arranged on the same circumference as in the embodiment shown in FIG. There is. Also, behind each permanent magnet, winding coils 40a, 40b; 42a, 42b are provided as in the previous example.
The pair of coils are wound in a direction that cancels out the magnetic field of each permanent magnet.

Therefore, when using an alternating magnetic field device consisting of two types of magnetic field generating means, such as a combination of a permanent magnet and a wound coil, when each coil is not energized, , generated by the respective permanent magnet combinations, namely 64a and 64b; 66a and 66b,
The flow of the magnetic fluid 26 flowing through the orifice 34 is restricted by the vertical alternating magnetic field consisting of magnetic fields in opposite directions. On the other hand, by energizing these coils, the vertical magnetic field generated by each permanent magnet is reduced. By canceling the flow, the flow suppressing effect on the magnetic fluid 26 flowing through the orifice 34 is canceled or relaxed, and the magnetic fluid 26 inside the orifice 34 is made to flow easily.
6 can be effectively controlled. Therefore, depending on the driving condition of the vehicle, for example, when the vehicle is idling, each coil is energized to cancel the vertical magnetic field caused by the permanent magnet and exhibit low dynamic spring characteristics. High attenuation due to the vertical alternating magnetic field generated by each permanent magnet.
This makes it possible to create an engine mount that exhibits high dynamic spring characteristics.

The preferred embodiment of the present invention in which the flow of water-based magnetic fluid in the orifice is controlled by a vertical alternating magnetic field has been described above.
There is no problem even if the structure is such that an axial alternating magnetic field is applied as shown in FIGS. 2 to 16.

First, in the embodiment shown in FIG.
The two types of winding coils 70 and 72 having different winding directions are alternately arranged coaxially so that their axes coincide with the flow direction of the magnetic fluid 26 in the orifice 34. At the same time, the hollow holes at the centers of these wound coils constitute a part of the orifice 34, and the magnetic fluid 26 is made to flow within these hollow holes.
Therefore, when these wound coils 70 and 72 are respectively supplied with power from the outside, an alternating magnetic field is generated in which magnetic fields in different directions are alternately formed in the axial direction for each coil, as shown in the figure, and this causes the orifice to be The flow of the aqueous magnetic fluid 26 flowing through the magnetic fluid 34 is effectively controlled.

Further, in the embodiment shown in FIGS. 13 and 14, the upper plate 30 constituting the partition member 18
A circumferential hole 78 formed between the lower plate 32 and the lower plate 32
Inside, two types of winding coils 80, 82 having different winding directions are arranged alternately on the same circumference with the same phase difference, and these coils 80, 82 are arranged alternately on the same circumference with the same phase difference.
The coil composite body 8 is connected and molded in a donut shape with resin, with a circular orifice 34 formed inside so as to connect the hollow hole at the center of the coil composite body 8.
4 is accommodated. Note that the orifice 34 formed inside this coil complex 84 is
Through communication blocks 86 at both ends thereof,
The orifice 34 is connected to communication holes (not shown) provided in the upper plate 30 and the lower plate 32, respectively, and one end of the orifice 34 is connected to the first fluid chamber 20 and the orifice 34 is connected to the first fluid chamber 20 through the communication holes. The other end of the fluid chamber 24 is connected to the second fluid chamber 24 .

Therefore, two such coils with different winding directions are used.
The alternating, circumferential arrangement of the seed-wound coils 80 and 82 creates alternately opposite unidirectional magnetic fields in the flow direction of the magnetic fluid 26 in the orifice 34 when the coils are externally energized. As a result, the flow of the magnetic fluid 26 flowing through such an orifice 34 can be effectively controlled.

Furthermore, in the embodiment shown in FIGS. 15 and 16, in the embodiment shown in FIGS. 13 and 14, each winding coil 80,
A cylindrical permanent magnet 8 is placed in the hollow hole at the center of the magnet 82.
It is characterized by the placement of numbers 8 and 90.
In other words, the cylindrical permanent magnets 88 and 90 are connected to the magnetic fluid 26 between its axis and the orifice 34.
The winding coils 80 and 82 are arranged so that their flow directions coincide with each other, and the winding coils 80 and 82 are arranged so as to surround the outer (back) periphery of the coils. The two types of permanent magnets 88 and 90 are arranged so that the directions of their magnetic fields are opposite to each other, while the winding directions of the respective winding coils 80 and 82 are different from each other. It has a structure in which it is wound in a direction that cancels out the magnetic field of 90 degrees.

Such permanent magnets 88, 90 and wound coil 8
In the case of an alternating magnetic field generator having a structure in which magnets 0 and 82 are combined, the perpendicular magnetic field generated by the permanent magnets 88 and 90 is canceled by energizing the coils 80 and 82, thereby increasing the magnetic fluid 26 flowing through the orifice 34. The fluidity is controlled, and the spring characteristics and damping characteristics of the mount are thereby advantageously controlled. Note that this embodiment can be used in the same way as the engine mount that generates a vertical alternating magnetic field as shown in FIG. 11 above.

Although several embodiments have been described in detail above, the present invention can be implemented in various forms without departing from the spirit thereof, and there are various embodiments other than the above-mentioned examples. However, although further illustrations thereof will be avoided here, it goes without saying that all of these various embodiments are included within the scope of the present invention as long as they do not depart from the spirit of the present invention. be.

(Effects of the Invention) As is clear from the above description, according to the configuration of the present invention, the water-based magnetic fluid that is caused to flow through the orifice that communicates the first fluid chamber and the second fluid chamber is alternately By applying an alternating magnetic field consisting of a combination of magnetic fields in opposite directions to each other, an apparent thickening effect can be effectively brought out. By making
By effectively controlling the dynamic spring characteristics based on the flow of the aqueous magnetic fluid through the orifice means provided between these two fluid chambers, it became possible to arbitrarily create the desired dynamic spring state. . That is, by controlling the generation of the alternating magnetic field according to the driving conditions of the vehicle, it is possible to achieve a mount function that can most effectively attenuate or isolate vibrations input in various driving conditions. be.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an example of an alternating magnetic field.
2, 3, and 4 are cross-sectional explanatory diagrams of magnetic fluid-filled vibration isolation support devices having different magnetic field configurations, respectively, and FIG. 2 is a comparative example device with a conventional structure, and FIG. FIG. 4 shows a device constructed according to the invention. FIG. 5 is a graph showing the transmission force characteristics in the comparative example device shown in FIG. 2, and FIG. 6 is a graph showing the transmission force characteristics in the device of the present invention shown in FIG. FIG. 7 is a cross-sectional explanatory diagram corresponding to FIG. 3 showing another embodiment of the present invention, and FIG.
8 is a plan view of the upper plate constituting the partition member in FIG. 7, and FIG. 8b is a cross-sectional view taken in FIG. 8a. Figures 9, 10 and 11
The figures are sectional explanatory views corresponding to FIG. 3 showing other different embodiments of the present invention. Further, FIG. 12 is a sectional view showing an example of a fluid-filled vibration damping support device according to the present invention having a structure for generating an axial alternating magnetic field, and FIGS. 13 and 15 are
A cross-sectional explanatory view corresponding to FIG. 12 showing different embodiments of the present invention, FIG. 14, and FIG. 16 respectively show the interface between the upper plate and the lower plate of the partition member 18 in FIGS. It is an explanatory view showing a state cut at. 2: Orifice, 4: Magnet, 6: Water-based magnetic fluid, 8: Passage, 12: Rubber block, 1
4, 16: Mounting bracket, 18: Partition member, 20:
First fluid chamber, 22: Diaphragm, 24: Second fluid chamber, 26: Water-based magnetic fluid, 30: Upper plate, 3
2: Lower plate, 34: Orifice, 40a, 40b,
42a, 42b: Winding coils 44, 46, 52:
iron core, 56: movable plate, 62: movable member, 64a,
64b, 66a, 66b: permanent magnet, 70,7
2, 80, 82: wound coil, 88, 90: permanent magnet.

Claims (1)

[Scope of Claims] 1. A first fluid chamber and a second fluid chamber are provided on both sides of the partition member, and the fluid chambers are communicated with each other by an orifice, and at least one of the fluid chambers is connected to the fluid chamber by an orifice. A rubber elastic body is provided so as to define a part of the fluid chamber, and the volume of the fluid chamber is made variable depending on the vibration input, and the fluid sealed in the fluid chamber passes through the orifice in response to the vibration input. In the fluid-filled vibration damping support device configured to be able to flow back and forth between the fluid chambers, a water-based magnetic fluid is used as the fluid and is sealed in the first and second fluid chambers, while a magnetic field in a predetermined direction is applied. At least one of the second magnetic field generating means that generates a magnetic field and at least one of the second magnetic field generating means that generates a magnetic field in a direction opposite to that of the first magnetic field generating means are arranged in the flow direction of the magnetic fluid in the orifice. A fluid-filled vibration damping support characterized in that the flow of the magnetic fluid in the orifice is controlled by the action of mutually opposite magnetic fields generated by the magnetic field generating means. Device. 2. Claim 1, wherein the first and second magnetic field generating means each generate a magnetic field in a direction perpendicular to the flow direction of the magnetic fluid in the orifice and in opposite directions. The fluid filled type anti-vibration support device described above. 3. The first magnetic field generating means and the second magnetic field generating means each include a pair of wound coils arranged to sandwich the orifice,
3. The fluid-filled vibration damping support device according to claim 2, wherein the pair of wound coils are configured to generate magnetic fields in the same direction. 4. The first magnetic field generating means and the second magnetic field generating means are respectively arranged to sandwich a permanent magnet that forms a unidirectional magnetic field and are arranged to sandwich the orifice, and are arranged outside of the permanent magnet. 3. The fluid-filled vibration damping support device according to claim 2, comprising a pair of wound coils wound in a direction that cancels out the magnetic field of the permanent magnet. 5. Claim 1, wherein the first and second magnetic field generating means each generate a magnetic field in a direction parallel to the flow direction of the magnetic fluid in the orifice and in opposite directions. The fluid filled type anti-vibration support device described above. 6. The first magnetic field generating means and the second magnetic field generating means are each constituted by a wound coil having an axis that coincides with the flow direction of the magnetic fluid in the orifice, and a hollow space in the center of the wound coil is formed. 6. The fluid-filled vibration damping support device according to claim 5, wherein the hole constitutes a part of the orifice. 7. The first magnetic field generating means and the second magnetic field generating means each have an axis that coincides with the flow direction of the magnetic fluid in the orifice, and the hollow hole in the center forms a part of the orifice. Claim 5, comprising a cylindrical permanent magnet that forms a unidirectional magnetic field, and a wound coil arranged outside the permanent magnet and wound in a direction that cancels the magnetic field of the permanent magnet. The fluid filled type anti-vibration support device described above.