JPS61184244A - Fluid-sealed type vibrationproof assembly - Google Patents

Abstract

PURPOSE:To enable effective shut off of vibration by means of effective low dynamic spring characteristics, by a method wherein a moving plate is adapted to be moved by a given distance according to a fluctuation in a pressure in a pocket part and a fluid containing part. CONSTITUTION:When vibration of low frequency and high amplitude is input, a moving plate 77 is widely deformed by elastic deformation action by means of a high fluid pressure exerted by a liquid containing part 78 and a pocket part 34. A deforming amount (moving amount) is controlled as a result of a ring member 68 being forced into contact with the bottom of a space forming recess 71, and non-compressive fluid is caused to flow between the fluid containing part 78 and the pocket part 34 through an orifice containing a fluid passage 76, extended in the direction of the periphery of a partition member 16, by means of a high fluid pressure generated in the fluid containing part 78 and the pocket part 34, and this produces a high damping effect.

Description

Detailed Description of the Invention (Technical Field) The present invention relates to a vibration isolating support used in automobiles, etc., and in particular, it is attached to a predetermined mounting shaft and effectively damps or blocks vibrations in the axial direction. The present invention relates to a fluid-filled vibration isolation assembly as a vibration isolation support that has excellent vibration isolation characteristics in both high and low frequency ranges.

(Prior Art) A type of vibration-proof support used in the suspension of vehicles such as automobiles is a vibration-proof assembly that is attached to a predetermined mounting shaft and mainly damps or blocks vibrations in the axial direction. be. For example, vibration isolating supports used in automobile body mounts, cab mounts, member mounts, strut bar cushions, etc. are examples.

By the way, in such a vibration-proof support, a rubber elastic body has conventionally been used alone or in a composite with synthetic resin, canvas, etc., and vibration damping or vibration absorption has been achieved based on the elastic action of the rubber elastic body. If rubber with a low dynamic spring constant is used to reduce vibration noise in the high frequency range, the loss coefficient of the rubber will inevitably become smaller, resulting in a lower damping characteristic. Vibration (shaking) in the area
It was extremely difficult to reduce this.

On the other hand, elastic supports that can obtain both low dynamic spring characteristics and high damping characteristics by utilizing the elasticity of rubber and the flow resistance of fluid are disclosed in Japanese Patent Publication No. 48-36151 and Japanese Patent Publication No. 52-16555.
However, since all of them have a structure that receives vibration loads mainly in the radial direction, due to structural constraints, vibration isolators such as tension irons and strut bars are not recommended. It was difficult to apply it as is to a vibration-proof support that is attached so as to receive the main load in the axial direction.

(Problem to be solved) For this reason, the inventors of the present invention previously applied for patent application No. 59-5858.
As No. 4, two types of pockets opening at each end are provided in a cylindrical rubber elastic body disposed on the outer periphery of the inner cylindrical metal fitting, and a rigid cylindrical member is embedded within the rubber elastic body. , and proposed a fluid-filled vibration damping support in which the two types of pockets are communicated with appropriate orifice means, for example, a hole penetrating the cylindrical wall of the cylindrical member in the axial direction. There is an inherent problem in that it is difficult to form a long orifice that communicates the two types of pockets at the top.

However, as is conventionally known, the longer the length of the orifice that communicates between the two pockets that form the fluid chamber, the greater the damping effect on low-frequency vibrations. This restriction makes it impossible to further improve the vibration damping performance of the vibration damping support.

In addition, in a fluid-filled vibration isolation support structure in which two types of pocket portions are communicated only through the orifice, when high-frequency vibrations are input, the fluid cannot pass through the orifice, and as a result, There is a problem in that the pressure inside the pocket increases and the dynamic spring constant increases.

For this reason, the main body rubber (rubber elastic body) of such a fluid-filled vibration isolating support is composed of a rubber compound that can exhibit low dynamic spring characteristics, thereby increasing the dynamic spring constant against vibration input in the high frequency range. However, this is very limited and does not allow for sufficient low dynamic spring characteristics in the high frequency range.

(Solution Means) Here, the present invention has been made to solve the above-mentioned problems, and its feature is that the present invention is attached to a predetermined mounting shaft and inputs mainly in the axial direction. A vibration isolating assembly designed to attenuate or block vibrations caused by the vibration, includes (a) an inner cylindrical metal fitting into which the predetermined mounting shaft is inserted, and (b) a cylindrical inner flange portion erected on the inner peripheral edge. an annular plate having at least one notched hole in the circumferential direction; and a rubber having a predetermined pocket portion integrally vulcanized with the plate and having an opening in a portion of the plate corresponding to the notched hole. (C) between an annular first elastic member having an elastic body and attached to the outside thereof into which the inner cylinder fitting is fitted; and (C) an outer peripheral edge of the annular plate of the first elastic member; a cylindrical outer flange which is fixed by caulking at the annular plate, and which is located opposite to the inner flange portion in the radial direction of the annular plate and forms an annular housing portion between the inner flange portion and the inner flange portion; an annular mounting bracket provided with a section, an annular end fitting attached to the inner cylindrical fitting at the inner peripheral edge, and an integral vulcanization molding between the fitting and the end fitting; a cylindrical rubber elastic body disposed at a predetermined distance on the outer periphery of the cylindrical metal fitting to form a predetermined fluid storage portion between the inner cylindrical metal fitting and the inner cylindrical metal fitting in the axial direction of the inner cylindrical metal fitting; (d) a pocket provided in the rubber elastic body of the first elastic member and the rubber elasticity of the second elastic member; (e) an inner flange portion of the annular plate of the first elastic member and an outer flange portion of the mounting bracket of the second elastic member; The ring formed between the rings.

It is housed in a shaped accommodating part, partitions the pocket part of the fluid accommodating mechanism and the fluid accommodating part into separate fluid chambers, communicates the pocket part and the fluid accommodating part, and extends for a predetermined length at least in the circumferential direction. an annular partition member in which an orifice having a fluid passage is formed; (f) a movable plate provided on the partition member and movable a predetermined distance according to fluctuations in pressure within the pocket portion or the fluid storage portion; (g) The fluid storage mechanism is configured to include a predetermined incompressible fluid sealed in the pocket portion and the fluid storage portion, respectively.

In the structure according to the present invention, the partition member is preferably configured to include two ring members each having a circumferential groove on one side that is partially discontinuous, By overlapping these ring members, at least a portion of the fluid passage is formed by the circumferential groove, and a predetermined mounting plate is provided on the mounting bracket side of the second elastic member. Generally, a structure is adopted in which the rubber elastic body of the second elastic member is vulcanized and bonded to the mounting plate.

Generally, the movable plate provided in such a partition member is located within the space formed between the two ring members.
The space is accommodated so as to be movable by a predetermined distance, and the space is communicated with the pocket part and the fluid storage part of the fluid storage mechanism, respectively, so that the movable plate in the space is provided with the fluid in the pocket part and the fluid storage part. It is configured such that pressure can be applied thereto. The movable plate may be placed in a floating state in the thickness direction within the space, or the movable plate may be formed of a rubber elastic material, and the outer peripheral edge of the movable plate may be made of a rubber elastic material. The center portion of the movable plate is held between the ring members to partition the space, and the center portion of the movable plate has its own elastic action to reduce the plate thickness. It is provided in a configuration that can be elastically displaced in the direction.

Further, in a preferred embodiment of the present invention, the end fitting of the second elastic member is configured to have a cylindrical mounting flange portion on the inner peripheral edge thereof, and the flange portion has a cylindrical shape. The second elastic member is fitted into the inner hole of the metal fitting so that the second elastic member is attached to the inner cylindrical metal fitting, thereby forming a predetermined fluid accommodating portion inside the second elastic member, and further The inner cylindrical metal fitting has a flange-like receiving plate on the outer circumferential surface of one end thereof, and the first elastic member into which the inner cylindrical metal fitting is inserted is attached to the inner cylinder by the receiving plate. The metal fitting is configured to be restricted from moving in one direction in the axial direction.

Furthermore, according to a preferred embodiment of the present invention, the first elastic member is provided with a portion of a plurality of bulges I in the circumferential direction (
Generally, a plurality of cutouts are formed in the annular plate corresponding to the pockets), and the plurality of pockets are provided in the annular plate of the first elastic member by suitable orifice means, such as the annular plate of the first elastic member. The circumferential grooves are communicated with each other by an orifice formed by being covered with the annular partition member.

Furthermore, in the present invention, preferably, the rubber elastic body of the first elastic member has an elastic cylindrical body portion that integrally extends along the inner peripheral surface of the cylindrical inner flange portion of the annular plate. When the inner cylindrical fitting is inserted through the elastic cylindrical body, a load in a direction perpendicular to the axis between the annular plate and the inner cylindrical fitting is applied to the elastic cylindrical body. It is structured so that it can be accepted.

(Function/Effect) Therefore, in the orifice structure of the vibration isolating assembly according to the present invention, it is necessary to provide a through hole in a simple plate-like body as in the past, attach a communicating pipe, or attach the inner cylindrical metal fitting. Unlike those with a structure in which an orifice forming sleeve is fitted onto the surface, the inner flange of the annular plate of the former and the mounting bracket of the latter are formed by a combined connection of a first elastic member and a second elastic member. By accommodating various annular partition members having desired passage cross-sectional areas and passage lengths in an annular accommodating portion between the outer flange portion of the fluid passage and the outer flange portion of the The desired orifice will be expertly formed.

As a result, the length of the orifice (communication path) can be reduced without making the structure of the partition member, which also functions as a partition means for partitioning the pocket part and the fluid storage part that constitute the fluid storage mechanism, so complicated. It became possible to effectively increase the length, and also to set the cross-sectional area relatively arbitrarily, making it possible to effectively enhance the damping effect in the intended vibration isolating assembly.

Further, in the present invention, a movable plate is incorporated in the partition member, and the movable plate can be moved a predetermined distance according to fluctuations in pressure within the pocket portion and the fluid storage portion. This effectively suppresses the increase in pressure in the pocket portion and the fluid storage portion, as well as the increase in the dynamic spring constant of the vibration isolating support as a whole.
Therefore, even if high-frequency vibrations are input, the effective low dynamic spring characteristics can effectively block the vibrations.

Moreover, for low-frequency, large-amplitude vibration input, effective vibration damping can be achieved by the flow resistance of the incompressible fluid passing through the orifice. In addition to being able to realize a fluid-filled vibration isolation assembly with excellent vibration isolation properties, the orifice length of a fluid-filled vibration isolation support using a movable plate can be made longer with a relatively simple structure. Therefore, we were able to advantageously realize a configuration that could be used.

In addition, according to the structure of the present invention, the first elastic member and the second elastic member are combined, and the outer peripheral edge of the annular plate of the first elastic member and the outer peripheral edge of the mounting bracket of the second elastic member are combined. By caulking and fixing the parts, it is possible to connect them all at once and form a fluid accommodation mechanism consisting of the pocket part and the fluid accommodation part at once. In this case, the ease of assembly and manufacturability will be further improved.

(Example) Hereinafter, in order to clarify the present invention more specifically,
The embodiment will be described in detail based on the drawings.

First, FIG. 1, FIG. 2, and FIG. 3 respectively show a plan view, an explanatory longitudinal cross-sectional view, and a cross-sectional view of a main part of an embodiment of a strut bar cushion device according to a fluid-filled vibration isolating assembly of the present invention. An explanatory diagram is shown.

In these figures, the vibration isolating assembly according to the present invention includes an inner cylindrical fitting 10 into which a predetermined mounting shaft such as a strut par (not shown) is inserted and attached, and an inner cylindrical fitting 10 into which the inner cylindrical fitting 10 is fitted. , a lower cushion rubber 12 as a first elastic member, an upper cushion rubber 14 as a second elastic member combined with this cushion rubber 12, and further these two cushion rubbers 12, 1.
4 with the partition member 16 interposed between them,
It is configured.

By the way, as is clear from FIGS. 4 and 5, the inner cylindrical metal fitting 10 constituting the vibration isolating assembly according to the present invention includes a cylindrical body 18 and a saucer-shaped plate fixed to one end of the cylindrical body 18 by welding or the like. It is composed of a flange-like receiving plate 20. Further, a large stepped portion 22 and a small stepped portion 2 are provided on the inner and outer circumferential surfaces of the other end of the cylindrical body 18 of the inner cylindrical fitting 10.
4 are provided respectively.

Further, as is clear from FIGS. 6 and 7, the lower cushion rubber (first elastic member) 12 includes an annular plate 28 having a cylindrical inner flange portion 26 on the inner peripheral edge thereof;
The annular plate 28 is composed of an annular rubber block 30 which is integrally vulcanized with the annular plate 28, and the annular plate 28 has three curved notch holes 32 with a predetermined phase difference in the circumferential direction. , 32.32 are provided. Pockets 34 of a predetermined size are provided in the rubber block 30 portion so as to have openings corresponding to the notch holes 32, and the pockets 34 are opened at the notch holes 32. It is said that the structure is

Also, the rubber block 30 of this lower cushion rubber 12
circular inner seals each extending in the circumferential direction such that the rubber material protruding from the annular plate 28 passes through the cutout hole 32 of the annular plate 28 and sandwiches the opening of the cutout hole 32 on the opposite surface of the annular plate 28; The annular plate 28 forms a protrusion 36 and an outer seal protrusion 38.
Similarly, in the curved recess 40 formed to connect the notch holes 32, 32 in the circumferential direction, the notch holes 32.3
A groove 42 is formed to connect the two.

Furthermore, the rubber block 30 is inserted in the axial direction along the inner circumferential surface of the inner flange portion 26 of the annular plate 28, and extends over the cylindrical portion 44 by a predetermined length from the inner flange portion 26. It has a ring-shaped metal fitting 46 at its tip. A circumferential rubber seal portion 48 extending integrally from the cylindrical portion 44 is formed on the outer peripheral edge of the ring-shaped fitting 46 .

On the other hand, the "second side cushion rubber 14" as a second elastic member
As shown in FIGS. 8 and 9, a cylindrical rubber block 50, end fittings 52 integrally vulcanized and bonded to both ends thereof, caulking fittings (mounting fittings) 54, and mounting It is composed of a plate 56. The end fitting 52 has an annular shape and has a cylindrical mounting flange 58 on its inner peripheral edge so as to be positioned within the cylindrical rubber block 50. Further, the caulking metal fitting 54 has a cylindrical outer flange portion 60 at its annular inner peripheral edge, and has a short cylindrical caulking portion 62 at its outer peripheral edge. Further, the tip of the outer flange portion 60 of the caulking metal fitting 54 is bent inward, and a seal portion 64 and a gong 1 extending integrally from the rubber block 50 are formed at the bent portion.

A mounting plate 56 is fitted into the cylindrical outer flange portion 60 of the caulking metal fitting 54 and is fixed to the flat portion of the caulking metal fitting 54 by projection welding or the like. As is clear from FIG. 8, this mounting plate 56 has mounting holes 66 at both ends, and is configured to be mounted to one of the two members to which vibrations are transmitted through the mounting holes 66. It has become.

The upper cushion rubber 14 is manufactured by vulcanizing the rubber block 50 in the presence of the end fitting 52, the integrated caulking fitting 54, and the mounting plate 56. It is fixed to these metal fittings and formed in one piece.

When the lower cushion rubber 12 and the upper cushion rubber 14 are combined, a circle is formed between the inner flange portion 26 of the annular plate 28 and the outer flange portion 60 of the caulking metal fitting 54. The partition member 16 accommodated in the annular accommodating portion is shown in FIGS.
It is constructed by overlapping two ring members 68 as shown in FIG.

That is, as is clear from those figures, the ring member 68 has a discontinuous circumferential groove 72 having a substantially semicircular shape on one side surface, and an end portion of the discontinuous circumferential groove 72 , a communication hole 74 passing through the ring member 68 in the thickness direction.
is formed.

Further, in the discontinuous portion 70 of the ring member 68 where the circumferential groove 72 is not provided, a cavity forming recess 71 of a predetermined length is provided, and a plurality of working holes are formed through the bottom of the recess 71. 73
is provided. Note that a communicating circumferential groove 75 having a predetermined depth is formed on the other side surface of the ring member 68.

Two such ring members 68 are arranged with their discontinuous circumferential grooves 72 facing each other and their communicating holes 74 facing each other.
are positioned on the end side of the other discontinuous circumferential groove 72, and furthermore, the movable plate 77 made of rubber material is positioned on the cavity forming recess 71, and the two are overlapped. A circumferentially extending fluid passage 76 (see FIG. 2) having a length of a discontinuous circumferential groove 72 with a predetermined cross-sectional area is formed between the ring member 68, and a communication hole is formed at both ends of the fluid passage 76. 7'4.74 allows communication with both sides of the partition member 16 in the thickness direction (direction in which the ring members 68 are stacked). Moreover, by this superposition, a predetermined space is formed between the ring members 68, 68 at the space forming recesses 71.
It will be separated at. In addition, the movable vi, 77 is
Its outer peripheral edge is held between upper and lower ring members 68, 68.

Inner cylindrical metal fitting 1o, lower cushion rubber 1 with the structure as shown above
2. When assembling the vibration isolation assembly shown in FIGS. 1 to 3 by combining the upper cushion rubber 14 and the partition member 16, first, the lower cushion rubber 1
2, and the lower part of the rubber block 30 of the lower cushion rubber 12 is seated on the dish-shaped receiving plate 20 of the inner cylinder fitting IO. Next, the inner flange portion 2G of the annular plate 28 of the lower cushion rubber 12 is heated in a predetermined incompressible fluid such as water, alkylene glycol, polyalkylene glycol, silicone oil, or a liquid low molecular weight polymer. With the partition member 16 consisting of the two combined ring members 68 and 68 fitted into the outer peripheral surface, the upper cushion rubber 14 is further overlapped and placed on the outer periphery of the inner cylindrical fitting 10. ,
Then, the mounting flange portion 58 of the end fitting 52 of the upper cushion rubber 14 is fitted into the inner stepped portion 22 of the cylindrical body 18 of the inner cylinder fitting 10, while the caulking portion 62 of the caulking fitting 54 of the upper cushion rubber 14 is fitted. By caulking and fixing it to the outer Jl edge of the lower cushion rubber 12,
The assembly operation will be completed.

By such assembly, the rubber block 50, the end fitting 52, the partition member 16, and the rubber block 30 of the lower cushion rubber 12 are integrated into the inside of the rubber block 50 of the upper cushion rubber 14. A fluid storage section 78 as one fluid chamber is formed surrounded by the cylindrical section 44 extending from the bottom and forms a fluid storage mechanism together with the pocket section 34 of the lower cushion rubber 12. As described above, since the lower cushion rubber 12 and the upper cushion rubber 14 are assembled in a predetermined incompressible fluid, such an incompressible fluid is simultaneously enclosed in the housing section 78 and the pocket section 34. It will be done.

In addition, in this assembly operation, the annular partition member 1
6 is housed in a housing portion formed between the inner flange portion 26 of the annular plate 28 of the lower cushion rubber 12 and the outer flange portion 60 of the caulking metal fitting 54 of the upper cushion rubber 14, and 26.60
The pocket portion 34 of the fluid storage mechanism and the fluid storage portion 78 are separated from each other by the partition member 16. For this purpose, the lower cushion rubber Three independent pockets 34, 34, 34 are formed within the twelve rubber blocks 30, each containing an incompressible fluid.

However, those three pocket parts 34°34.3
4, a concave groove 42 provided in the annular plate 28 and extending in the direction connecting the notch holes 32 in the circumferential direction is the partition member 16.
An orifice 8 formed by being covered by
o and a communication side a75. The upper and lower fluid accommodating portions 78 and the pocket portions 34, which respectively accommodate incompressible fluids, are communicated with each other by communication holes 74, 74 on both sides of the partition member 16 and a fluid passage 76 extending in the circumferential direction. It will be.

In addition, a ring member 68 constituting the partition member 16
．． As shown in FIG. 3, the movable plate 77 held between the ring members 68 and 68 partitions the space formed by the space forming recesses 71 and 71 between the ring members 68 and 68. A plurality of operation holes 73 provided at the bottom of the cavity forming recess 71 of the ring member 68 are communicated with the respective fluid chambers, that is, the fluid storage portion 78 and the pocket portion 34 via the communication circumferential groove 75. As a result, the fluid pressure in the fluid storage section 78 and the pocket section 34 is applied to the movable plate 77. and,
When such fluid pressure is applied, the movable plate 77 is elastically deformed in the thickness direction due to its own elastic action at its center because its outer peripheral edge is held. It will become.

In this way, the lower cushion rubber 12 and the -L side cushion rubber 14 are integrally connected by caulking and fixing by the caulking part of the mounting fitting 54, but such caulking metal fitting 54 and the annular plate 28 The space between them is effectively sealed by the outer seal protrusion 34 provided on the annular plate 28, and the sealed incompressible fluid will not leak out from the gap between these metal fittings.
Furthermore, even at the fitting portion between the end fitting 52 of the upper cushion rubber 14 and the end of the cylindrical body 18 of the inner cylindrical fitting 10, the rubber block 3 of the lower cushion rubber 12 is connected to the end fitting 52.
The metal fitting 46 at the end of the cylindrical portion 44 integrally formed with the cylindrical body 28 is pushed into the stepped portion 24 on the outside of the cylindrical body 28, and the rubber seal portion 48 is inserted between them. Due to the interposition, the incompressible fluid in the fluid storage portion 78 does not leak to the inner cylinder fitting 10 side.

Therefore, in the vibration isolating assembly having such a structure, a predetermined mounting shaft such as a tension rod, a slat bar, etc. is inserted into the cylindrical body 18 of the inner cylindrical fitting 10, and the mounting shaft 56 is attached to a vehicle body or the like through its mounting hole 66 and subjected to a vibration load mainly in the axial direction, each cushion rubber 12.
The deformation of the rubber blocks 36.50 of 14 induces a flow of incompressible fluid through the fluid passages 76 of the partition member 16 between the fluid containing portion 78 and the pocket portion 34,
As is well known, this produces a large damping effect due to the fluid flow resistance, thereby achieving effective vibration isolation.

That is, when a low frequency, large amplitude vibration is input, the movable plate 77 is largely deformed due to its elastic deformation action due to the large fluid pressure received from the fluid storage section 78 and the pocket section 34. , its deformation amount (
The deformation of the ring member 68 is regulated by contacting the bottom of the cavity forming recess 71 of the ring member 68.
Therefore, the large fluid pressure generated in the fluid storage portion 78 or the pocket portion 34 causes the incompressible fluid to flow between the fluid storage portion 78 and the pocket portion 34 through the orifice including the fluid passage 76 extending in the circumferential direction of the partition member 16. This creates a large damping effect.

In addition, in this case, the cross-sectional area and length of the fluid passage 76, which affect the vibration damping effect, are determined by the annular partition member 1.
6, it is positioned to extend in the circumferential direction, making it even longer, and its cross-sectional area can be arbitrarily set depending on the size of the cross-sectional area of the circumferential groove 72, so an effective damping effect can be obtained. That's what happens.

In addition, when high-frequency, small-amplitude vibrations are input, the fluid passages 76 provided in the circumferential direction of the partition member 16
Although it is extremely difficult for fluid to pass through the orifice containing the From the point where it is made to act on the flexible movable plate 77 from both sides through the hole 73,
By vibrating the movable plate 77 in response to such pressure, the pressure fluctuations can be alleviated, and the dynamic spring characteristics as a whole can be prevented from increasing, thereby achieving effective isolation against high-frequency vibrations. It is. In addition, since the dynamic spring constant in the high frequency range can be lowered in this way, the rubber hardness of the rubber block 30.50 of the cushion rubber 12.14 and the degree of freedom in rubber compounding can also be increased.

Furthermore, when a load is applied in a direction perpendicular to the axis between the inner cylinder fitting 10 and the mounting plate 56,
Such a load is caused by the cylindrical portion 44 integrally extending from the rubber block 30 of the lower cushion rubber 12
Since it exists between the cylindrical body 18 and the inner flange portion 26 of the annular plate 28 of the lower cushion rubber 12, it is effectively received by the elasticity of the cylindrical portion 44.

Furthermore, according to the structure of the above example, the lower cushion rubber 12
The assembly operation can be completed by simply caulking the caulking part 62 of the caulking metal fitting 54 of the upper cushion rubber 14 to the outer peripheral edge of the annular plate 28.
This makes it possible to further improve the assembly work.

Although one embodiment of the present invention has been described above, it should be understood that this is a literal illustration and that the present invention is not intended to be interpreted as being limited to such embodiment. It is. The present invention may be implemented in forms with various changes, modifications, improvements, etc. made based on the knowledge of those skilled in the art, without departing from the spirit of the invention. It also includes.

For example, in the above embodiment, three pocket portions 34 provided in the lower cushion rubber 12 as the first elastic member are provided at equal angular intervals in the circumferential direction, and they are interconnected by the orifice 80 and the communication tf 175. However, it is sufficient that at least one such pocket is provided (and even if multiple pockets are provided, their number and relative The fluid storage portion 7 may be formed in the upper cushion rubber 14 by making the pockets communicate with each other by appropriate orifice means, or by independently forming the pockets in the upper cushion rubber 14.
The configuration, such as whether or not it communicates separately with 8, can be changed as appropriate depending on the purpose.

Further, unlike the previous example, the mounting plate 56 is provided in a state fixed to the annular plate of the lower cushion rubber 12, and the outer peripheral edge of the annular plate 28 is attached to the mounting metal fitting (caulking metal fitting 54) of the upper cushion rubber 14. ) can also be secured by caulking to the outer peripheral edge.

Furthermore, as is well known, each cushion rubber 1
2. A restraining ring is provided on the outer periphery of each of the rubber blocks 30 and 50 in 14, so that when a vibration load is applied, the rubber block 30 or 50 bulges out toward the inner pocket portion 34 or fluid storage portion 78 side. There is no problem in increasing the amount of change in their volume to increase the flow rate of the incompressible fluid to further improve the damping effect. 1 Furthermore, although the movable side 77 is in the form of a relatively thin diaphragm made of rubber material in the above example, it may be made of other materials such as resin as long as it is flexible and deformable. There is no problem even if it is made of materials, and
Instead of the structure in which the outer peripheral edge is sandwiched between two ring members 68, 68, these ring members 68, 68
The movable plate is accommodated in a floating state (free state) in the thickness direction in the space formed by the space forming recess 71, 71, and as described above, the movable plate is accommodated in a floating state (free state) in the space formed by the space forming recess 71.
It is also possible to employ a structure in which such a floating movable plate is moved in the thickness direction by applying pressure fluctuations in the plate. In this case, as the material for the movable plate, other than rubber materials, resin materials, and even rigid metal materials can be used.

In addition, the end fitting 5 of the upper cushion rubber 14
2 and the inner cylindrical fitting 10, the above-mentioned structure is the most preferable, but the structure of forming a fluid storage part in the upper cushion rubber 14 by these attachments will be understood by those skilled in the art. Based on knowledge, changes can be made as appropriate.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of the vibration isolating assembly according to the present invention, and FIGS. 2 and 3 are a cross-sectional view taken along It is a diagram. 4 to 12 respectively show members constituting such an exemplary vibration isolating assembly, in which FIG. 4 is a plan view of the inner cylindrical metal fitting, and FIG. -V sectional view, Fig. 6 is a plan view of the lower cushion rubber, Fig. 7 is a -■ sectional view of Fig. 6, Fig. 8 is a bottom view of the upper cushion rubber, and Fig. 9 is a plan view of the lower cushion rubber. Fig. 10 is a plan view of a ring member constituting the partition member, and Fig. 11 is a cross-sectional view taken along line X-IX in Fig. 10.
It is an I sectional view. FIG. 12 is an explanatory diagram showing an exploded view of the partition member used on the upper side. 10: Inner cylinder metal fitting 12: Lower cushion rubber 14: Upper cushion rubber 16: Partition member 20: Receiving plate 26: Inner flange portion 28: Annular plate 30: Rubber block 32: Notch hole 34: Pocket portion 42: Concave groove 44: Cylindrical part 50: Rubber block 52: End fitting 54: Caulking fitting 56: Mounting plate 58:
Mounting flange portion 60: Outer flange portion 62: Caulked portion 66: Mounting hole 68: Ring member 70: Discontinuous portion 71: Hole forming recess 72: Discontinuous circumferential groove 73: Working hole
74: Communication hole 75: Communication circumferential groove 76: Fluid passage 78: Fluid storage section

Claims (10)

[Claims] (1) A vibration isolation assembly that is attached to a predetermined mounting shaft and mainly damps or blocks vibrations in the axial direction, and includes an inner cylindrical metal fitting through which the predetermined mounting shaft is inserted, and an inner peripheral edge. an annular plate having a cylindrical inner flange erected thereon and having at least one cutout hole in the circumferential direction; and an annular plate integrally vulcanized with the plate and having an opening in a portion of the plate corresponding to the cutout hole. a first annular elastic member having a rubber elastic body provided with a predetermined pocket portion having a predetermined pocket portion, and into which the inner cylinder fitting is fitted and attached to the outside thereof; An annular accommodating part is fixed to the outer peripheral edge of the plate by caulking, and is located opposite to the radially outer side of the inner flange of the annular plate, and is disposed between the inner flange and the annular accommodating part. an annular mounting fitting provided with a cylindrical outer flange portion forming a cylindrical outer flange portion, an annular end fitting attached to the inner cylindrical fitting at the inner circumferential edge, and a space between the mounting fitting and the end fitting. a cylindrical rubber elastic body that is integrally vulcanized and is disposed at a predetermined distance from the outer periphery of the inner cylindrical metal fitting to form a predetermined fluid storage portion between the inner cylindrical metal fitting and the inner cylindrical metal fitting; a second elastic member that is assembled and connected to the first elastic member at the outer circumference of the inner cylindrical fitting in the axial direction of the fitting; a pocket provided in the rubber elastic body of the first elastic member; a fluid storage mechanism comprising a fluid storage section formed inside a rubber elastic body of an elastic member; an inner flange portion of an annular plate of the first elastic member and an outer flange of a mounting bracket of the second elastic member; is housed in the annular accommodating part formed between the fluid accommodating mechanism, and partitions the pocket part of the fluid accommodating mechanism and the fluid accommodating part into separate fluid chambers, while communicating the pocket part and the fluid accommodating part. an annular partition member formed with an orifice having a fluid passage extending at least a predetermined length in the circumferential direction; and a partition member provided on the partition member and movable a predetermined distance according to fluctuations in pressure within the pocket portion or the fluid storage portion. A fluid-filled vibration damping assembly comprising: a movable plate having a movable plate; and a predetermined incompressible fluid sealed in a pocket portion and a fluid storage portion of the fluid storage mechanism. (2) The partition member is configured to include two ring members each having a circumferential groove with a discontinuous portion on one side surface, and by overlapping these ring members, the orifice can be closed. 2. The vibration isolation assembly according to claim 1, wherein at least a portion of the fluid passageway is formed by the circumferential groove. (3) The movable plate is housed in a space formed between the plurality of ring members so as to be movable a predetermined distance, and the space communicates with the pocket portion and the fluid storage portion of the fluid storage mechanism, respectively. 3. A vibration damping assembly as claimed in claim 2, wherein the movable plate in said cavity is forced to act on the fluid pressure of said pockets and said fluid reservoir. (4) The vibration isolation assembly according to claim 3, wherein the movable plate is accommodated in the cavity in a floating state in the plate thickness direction. (5) The movable plate is made of a rubber elastic material, and the outer peripheral edge of the movable plate is held between the ring members to partition the space, and 4. The vibration isolation assembly according to claim 3, wherein mainly the center portion of the movable plate can be elastically displaced in the thickness direction by its own elastic action. (6) A predetermined mounting plate is disposed on the mounting bracket side of the second elastic member, and the rubber elastic body of the second elastic member is vulcanized and bonded to the mounting plate. The vibration isolation assembly according to paragraph 1. (7) The end fitting of the second elastic member has a cylindrical mounting flange portion on its inner peripheral edge, and the mounting flange portion is fitted into the inner hole of the inner cylindrical fitting. A vibration isolation assembly according to any one of claims 1 to 6. (8) The inner cylindrical metal fitting has a flange-like receiving plate on the outer peripheral surface of one end thereof, and the first elastic member into which the inner cylindrical metal fitting is inserted is connected to the inner cylinder by the receiving plate. The vibration isolation assembly according to any one of claims 1 to 7, wherein movement of the metal fitting in one direction in the axial direction is restricted. (9) A plurality of the predetermined pocket portions are provided independently in the circumferential direction within the annular rubber elastic body, and the plurality of pocket portions are communicated with each other via a suitable communication mechanism. A vibration isolation assembly according to any one of claims 1 to 8. (10) The rubber elastic body constituting the first elastic member integrally forms a cylindrical elastic tube portion extending in the axial direction along the inner peripheral surface of the cylindrical inner flange portion of the annular plate. and by inserting the inner cylindrical metal fitting into the elastic cylindrical body, the elastic cylindrical body is interposed between the inner cylindrical metal part and the inner flange of the annular plate. A vibration isolation assembly according to any one of claims 1 to 9.