JPS61206838A - Bush assembling body with fluid - Google Patents

Abstract

PURPOSE:To obtain characteristics in high and low frequency range by providing a communicating passage giving small resistance to between two fluid chambers and a communicating passage giving large resistance thereto and by disposing a movable plate interrupting the latter communicating passage at the time of low frequency vibration on the passage. CONSTITUTION:A rubber elastic body 4 is fit between an inner cylinder metal fitting 2 and an outer cylinder metal fitting 6, and two fluid chambers 46, 46 are formed in the elastic body 4. The fluid chambers 46, 46 are communicated each other by a first communicating passage 48 and a second communication passage 50 formed by a circular arc orifice member 8. The first communicating passage 48 is formed to large resistance relatively and the second communicating passage give 50 is formed to give small resistance relatively. And a movable plate 36 is provided so as to interrupt the communicating passage 50 when a large displacement vibration of low frequency is generated.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a fluid-filled bushing assembly that achieves a vibration damping effect based on the elastic deformation of a rubber elastic body and fluid flow resistance, and particularly relates to a fluid-filled bushing assembly that achieves a vibration damping effect based on the elastic deformation of a rubber elastic body and the flow resistance of a fluid. This invention relates to a bush-type fluid-filled vibration damping support that can be changed according to its characteristics.

(Prior Art) A type of anti-vibration support used in the suspension of vehicles such as automobiles includes an anti-vibration assembly which is attached to a predetermined mounting shaft and mainly damps or blocks vibrations in the axial direction. be. For example, vibration-proof supports used in automobile body mounts, cab mounts, member mounts, strut bars, cushions, etc. are examples. In recent years, a fluid-filled bushing has been revealed as one such vibration-proofing support that combines both a vibration-insulating effect based on the elastic deformation of rubber and a vibration-damping effect based on the flow resistance of the fluid. 48-36151, Japanese Patent Publication No. 52-16554, etc., a cylindrical rubber elastic body is interposed between an inner cylindrical member and an outer cylindrical member, and the rubber elastic body is provided with a predetermined non-resistance. A structure is proposed in which a first fluid chamber and a second fluid chamber are formed, each of which is filled with a compressible fluid, and in which an incompressible fluid can mutually flow between the fluid chambers. has been done.

(Problem) By the way, this type of bushing is generally required to exhibit a large damping effect against excitation forces that cause large displacements at low frequencies, depending on the location where it is applied. At the same time, it is required to exhibit a low dynamic spring constant for excitation forces of high frequency and small displacement. However, in conventional fluid-filled bushings such as the upper part, the cross-sectional area and length of the orifice groove that communicates the first fluid chamber with the second fluid chamber remain unchanged.
It has been difficult to simultaneously satisfy the above two requirements. In other words, if the orifice is selected so that the damping force peaks in the low frequency range, the dynamic spring constant will be high in the high frequency range, and conversely, if the orifice is selected so that the dynamic spring constant is low in the high frequency range, the dynamic spring constant will be high in the high frequency range. This is because the damping performance will be insufficient.

On the other hand, unlike the bush type anti-vibration support, which has a structure in which a cylindrical rubber elastic body is interposed between the inner cylinder member and the outer cylinder member, the block-shaped rubber body is equipped with a predetermined mounting bracket. As a mount-type fluid-filled vibration damping support having a structure fixed by integral vulcanization molding, Japanese Patent Laid-Open No. 53-5376 and Japanese Patent Laid-Open No. 57-9340 disclose a pressure-receiving chamber in such a rubber block. In addition, an equilibrium chamber is provided separately from the pressure receiving chamber, and these compartments are connected by an orifice to produce a predetermined flow resistance, while a movable plate is provided between the pressure receiving chamber and the equilibrium chamber. By providing this to avoid pressure rise in the pressure receiving chamber and effectively utilizing the spring constant of the rubber block, high damping characteristics in the low frequency range and low dynamic spring constant in the high frequency range are achieved. Although a fluid-filled mount that satisfies the above requirements at the same time has been disclosed, it is structurally extremely difficult to apply such a structure as it is to a bush type anti-vibration support.

That is, in the bush type vibration isolating support, since the cylindrical rubber elastic body is interposed between the inner cylinder member and the outer cylinder member, among the rubber elastic bodies, The outer surface is physically restricted, so even if a structure such as the above-mentioned mount type is to be adopted, it is extremely difficult to adopt it due to space (structural) considerations.

(Solution Means) Here, the present invention was made under the above circumstances, and its feature is that a predetermined metal sleeve is integrally fixed to the outer peripheral surface by integral vulcanization molding. A cylindrical rubber elastic body having a plurality of independently provided pockets corresponding to a plurality of windows formed at predetermined positions in the circumferential direction of the metal sleeve is attached concentrically to the outside of the inner cylinder member. At the same time, a predetermined outer cylindrical member is press-fitted into the outer peripheral surface of the metal sleeve fixed to the rubber elastic body, and the opening of the pocket portion provided in the rubber elastic body is opened with the outer cylindrical member. By covering, a plurality of independent fluid chambers are formed, and a predetermined incompressible fluid is sealed in each of the plurality of fluid chambers, while the incompressible fluid can mutually flow between the fluid chambers. In the fluid-filled bushing assembly configured as above, a predetermined intersleeve is embedded concentrically within the rubber elastic body, while a predetermined intersleeve is provided with respect to the incompressible fluid so as to extend from one of the plurality of fluid chambers to the other. Arc-shaped orifice members forming first and second communicating passages that provide different flow resistances are disposed in the circumferential direction on the outer periphery of the rubber elastic body, thereby providing a relatively large flow resistance. The incompressible fluid is allowed to flow between the fluid chambers through the first communication path, and the communication between the fluid chambers is blocked through the second communication path, which provides relatively small flow resistance. The movable plate is disposed in the fluid chamber and is movable by a predetermined distance toward the other fluid chamber in response to pressure fluctuations in one of the fluid chambers.

Further, the present invention can advantageously provide a bush type fluid-filled vibration damping support that can simultaneously satisfy high damping characteristics in a low frequency range and a low dynamic spring constant in a high frequency range. It has become.

In the present invention, it is preferable that the arc-shaped orifice member straddles between the pocket portions by cutting out the metal sleeve and forming the outer periphery of the rubber elastic body into a groove shape. A first orifice groove having a small cross-sectional area and a second orifice groove having a large cross-sectional area are provided on the outer peripheral surface of the orifice member. and the first and second orifice grooves are covered with the press-fitted outer cylindrical member, thereby forming the first and second communication passages, respectively. Become.

Further, according to a preferred aspect of the present invention, the arc-shaped orifice member is made to protrude a predetermined length into one of the fluid chambers with which it is communicated, and the second communication member located at the protrusion portion. A structure is adopted in which the movable plate is provided in the passage portion, and furthermore, at the end of the orifice member on the side protruding into the one fluid chamber, the second communication passage has a dead end structure, while the orifice member has a dead end structure. A movable plate storage pocket is provided on the inner surface of the entry portion of the member, and the second communication path communicates with the movable plate storage pocket through a through hole that penetrates the orifice member in the thickness direction. so that the pressure of the other fluid chamber transmitted through the second communication path is applied to one side surface of the movable plate housed therein, and the other side of the movable plate is The pressure of the one fluid chamber is applied to the surface side of the fluid chamber.

(Operation/Effect) Therefore, in the fluid-filled bushing assembly according to the present invention configured as described above, when an excitation force that causes a large displacement at a low frequency is applied, the two fluid chambers are arranged so as to connect. A movable plate provided in the communication passage (second) that provides relatively small flow resistance and is formed by the orifice member formed by Displacement (movement) by a predetermined distance due to pressure action
However, if the flow exceeds that point, the incompressible fluid is prevented from flowing through that communication path, and as a result, it passes through another communication path, that is, the first communication path, which provides a relatively large flow resistance. Incompressible fluid flows between the two fluid chambers, thereby effectively damping vibrations that cause large displacements at low frequencies.

On the other hand, when a high frequency and small displacement excitation force is applied,
According to the fluctuations in pressure within the fluid chamber caused by this, the movable plate provided therein can be acted upon via a communication path that provides a relatively small flow resistance, and the movable plate can be moved a predetermined distance. As a result, the increase in pressure in these two fluid chambers and, in turn, the increase in the dynamic spring constant of the bushing assembly (vibration isolating support) as a whole are effectively suppressed. Even if vibrations are input, the effective low dynamic spring characteristics can effectively block the vibrations.

Moreover, according to the bushing assembly structure according to the present invention, the orifice member is disposed at the outer peripheral portion of the rubber elastic body so as to extend in the circumferential direction from one fluid chamber to the other fluid chamber. Therefore, it is possible to effectively form two types of communication paths that provide different flow resistances, and it is also possible to advantageously provide a movable plate there, which can greatly contribute to improving the vibration isolation function in the high frequency range. It becomes.

In addition, since the intersleeve is concentrically embedded in the rubber elastic body constituting the bushing assembly according to the present invention, it has low spring characteristics in the axial direction and 1. The spring characteristics in the direction perpendicular to the axis can be effectively increased while maintaining the low spring characteristics in the torsional direction, thereby satisfying all requirements for improving steering stability required of a suspension bushing for a vehicle. It became.

However, in order to improve the steering stability of the vehicle, it is necessary to increase the ratio of the spring constants of the bushing in the axis-perpendicular direction and in the axial direction.

(Example) Hereinafter, an example in which the present invention is applied to a suspension bushing used in a suspension system of an automobile will be described in detail based on the drawings.

First, Fig. 1 shows a cross-sectional view of the fluid-filled bushing assembly, Fig. 2 shows a longitudinal sectional view thereof, and Figs. 3 and 4 show partial longitudinal sectional views thereof. are shown respectively.

In those figures, the fluid-filled bushing assembly according to the present invention includes a thick-walled cylindrical inner tube fitting 2 that functions as an inner tube member, and a rubber sleeve that is a cylindrical rubber elastic body disposed concentrically on the outside of the inner tube fitting 2. 4, and a cylindrical outer cylinder member 6 which is press-fitted to the outside of the rubber sleeve 4 and functions as an outer cylinder member. and an arc-shaped orifice member 8 disposed in the circumferential direction on the outer circumferential portion of the rubber sleeve 4 and abutting on the inner circumferential surface of the outer cylinder member 6.

By the way, as shown in FIGS. 5 to 7, the rubber sleeve 4 in such a fluid-filled bushing assembly is formed into a thick-walled cylindrical shape by integrally vulcanizing and positioned outside the metal inner cylindrical fitting 2. At the same time, a metal sleeve 10 is integrally vulcanized and bonded to the outer peripheral surface of the rubber sleeve 4. In other words, rubber sleeve 4
has a structure in which the inner cylindrical fitting 2 and the metal sleeve 10 are integrally vulcanized and formed. Inside the rubber sleeve 4 is a metal intersleeve segment 12 having a half-split shape (half-cylindrical shape) as shown in FIGS. 8 and 9.
The two are combined into a cylindrical shape and buried and arranged concentrically.

Further, the rubber sleeve 4 is provided with a pair of pocket portions 14.14 having a predetermined depth symmetrically with respect to the axis, and the orifice member 8 is fitted in the pocket portions 14.14. A fitting groove 16 is formed in the outer circumference of the rubber sleeve 4 in the form of a concave groove, while the pocket portions 14, 14 and the fitting groove 16 are both open to the outside. Therefore, the metal sleeve 10 fixed to the outer peripheral surface of the rubber sleeve 4 has two symmetrical windows 18 and 1, as shown in FIGS. 10 and 11.
8, and a circumferential notch 20 having a predetermined width that connects the windows 18, 18. Further, the half-shaped intersleeve divided body 12 concentrically embedded in the rubber sleeve 4 is also provided with a rectangular shape having a size sufficient to allow the pocket portion 14 to fit into the portion where the pocket portion 14 is provided. A notch hole 22 is provided.

Further, the rubber sleeve 4 has a space 24.24 extending in the axial direction between the circumferential ends of a pair of half-shaped intersleeve segments 12.12 embedded therein. This space 24°24 has two pocket parts 1
4.14, and by applying a squeezing operation from the metal sleeve 10 side (from the outside) to the rubber sleeve 4 formed by integral vulcanization molding, the intersleeve It is possible to simultaneously apply preliminary compression to the rubber sleeve 4 portions located on the outside and inside of the divided body 12, and the adhesive surface of the rubber sleeve 4 is The durability of the material can be improved. As is clear from FIGS. 5 to 7, a rubber seal portion 2 extending from the rubber sleeve 4 at a predetermined height is provided at the peripheral edge of the window portion 18 and the notch portion 20 of the metal sleeve 10.
6 and 28 are provided in a continuous configuration.

Furthermore, as is clear from FIGS. 1, 2, 4, and 12, the orifice member 8 fitted into the fitting groove 16 of the rubber sleeve 4 is attached to one pocket portion 1.
It has an arcuate shape that is longer than the length of the fitting groove 16 by a predetermined length so that it can be inserted into the fitting groove 16 by a predetermined length. Second orifice grooves 32 each having a large cross-sectional area are formed in the circumferential direction. The second orifice groove 32 having a large cross-sectional area has a dead end structure (closed structure) at the end of the orifice member 8 on the side that is projected into the pocket portion 14, and has a dead end structure (closed structure) at the bottom near the dead end portion. , has a through hole 34 penetrating through the orifice member 8 in the thickness direction.

Further, a movable plate 36 made of rubber is arranged so as to cover and close the through hole 34 from the inside of the orifice member 8, that is, from the inner surface side, and a pocket portion for accommodating the movable plate 36 is formed. A pocket forming member 40 having a recess 38 slightly larger than the movable plate 36 is fixed to the inner surface of the orifice member 8 in correspondence with the through hole 34. A plurality of through holes 42 are provided at the bottom of the recess 38 of the pocket forming member 40.
is provided and communicated within the pocket portion 14 of the rubber sleeve 4.

Furthermore, the outer cylindrical fitting 6 that is press-fitted into the outer circumferential surface of the metal sleeve 10 fixed to the rubber sleeve 4 is a thirteenth
As shown in Figures 14 and 14, the length in the axial direction is longer than the metal sleeve 10 vulcanized and bonded to the orifice groove, and one end of the sleeve 10 in the axial direction has a stepped structure. It has a structure in which a flange portion 44 is provided.

When assembling a fluid-filled bushing assembly as shown in FIG. 1 according to the present invention using each component having such a structure, first, the inner cylindrical fitting 2 and the metal sleeve are formed on the inner and outer peripheral surfaces by integral vulcanization molding. 10 is integrally fixed to the rubber sleeve 4, and a predetermined incompressible fluid such as water, alkylene glycol, polyalkylene glycol, or silicone oil is filled in the fitting groove 16 provided on the outer periphery of the rubber sleeve 4. Or, in a fluid such as a mixture thereof, the orifice member 8 is fitted and assembled so that the end on the side where the movable plate 36 is provided is inserted into one pocket portion 14, 14 by a predetermined length.

Next, with the orifice member 8 assembled, the outer cylindrical fitting 6 is press-fitted onto the outer circumferential surface of the metal sleeve 10 fixed to the outer circumferential surface of the rubber sleeve 4,
As a result, a predetermined incompressible fluid is sealed in each of the two pocket portions 14 and 14, and the openings of the pocket portions 14 are covered with the outer cylindrical fitting 6, thereby creating two independent fluid chambers 46. to form.

Further, the outer openings of the first and second orifice grooves 30 and 32 of the orifice member 8 are similarly connected to the outer cylinder fitting 6, respectively.
The first and second communication passages provide different flow resistances to the incompressible fluid by being covered with Thus, a second communication path 50 is formed that provides a small flow resistance.

0, in such a press-fitted state of the outer cylinder metal fitting 6,
After the stepped flange portion 44 of the outer cylindrical fitting 6 is caulked and fixed to the flange portion of the metal sleeve 10, the outer cylindrical fitting 6 is subjected to a required drawing process using a helical drawing method. Then, the end opposite to the stepped flange portion 44 is attached to the metal sleeve l by roll caulking.
By fixing it to the end of the O, the desired bushing assembly as shown in FIG. 1 is completed.

Therefore, in the assembled state in this way, the two pockets 14 formed in the rubber sleeve 4
．． 14 and two fluid chambers 46 defined by the outer cylinder fitting 6.
46 are communicated by a first communication path 48 formed by the first orifice groove 30 that opens at both ends of the orifice member 8, and the fluid chambers 46 and 46 are communicated through the first communication path 48. By causing the incompressible fluids to flow through each other, a relatively large desired flow resistance is generated. On the other hand, the second communication path 50 formed by the second orifice groove 32 of the orifice member 8 opens at one end side of the orifice member 8 and communicates with one fluid chamber 46.
The other end side has a dead end structure, and a movable plate 36 is provided, which is accommodated in a recess 38 of the pocket forming member 40 through a through groove 34 passing through the bottom of the movable plate 6. Said one fluid chamber 4 on one side surface
6 is applied.

That is, the pressure in the other fluid chamber 46 is applied to the other side surface of the movable plate 36 through the through hole 42 provided at the bottom of the recess 38 of the pocket forming member 40. ,ru.

In short, the movable plate 36 functions to partition the second communication path 50 and cut off communication to the other fluid chamber 46, and forms a pocket portion according to pressure fluctuations in each of the two fluid chambers 46, 46. Displacement (movement) by a predetermined distance within the pocket formed by the recess 38 of the member 40
It is now possible to be forced to do so. Note that this second communication path 50 has a relatively small flow rate in order to effectively transmit pressure fluctuations so that the movable plate 36 can be displaced in accordance with pressure fluctuations in the fluid chamber 46. It is said to be a passage (orifice structure) that provides only resistance.

Incidentally, a fluid-filled bushing assembly having such a structure can be suitably used as a suspension bushing in a suspension system of an automobile, for example. In that case, the outer cylinder fitting 6 is fitted into, for example, the boss portion of the control arm, while the vehicle body or wheel side shaft is inserted into the inner cylinder fitting 2, and the pair of fluid chambers 46 and 46 will be used in a state where they are opposed to each other in the direction in which they receive the main vibration load.

When an excitation force (vibration load) that causes a large displacement at a low frequency is applied, the elastic deformation of the rubber sleeve 4 causes the volume of one of the two fluid chambers 46, 46 to decrease, and the volume of the other fluid chamber to decrease. By increasing the volume, the first communication path 4
8 and the second communication path 50, the second communication path 50 is provided with a movable plate 36 to partition it, and the fluid flows through the second communication path 50. fluid communication between the fluid chambers 46, 46 is substantially prevented, and therefore fluid communication between the fluid chambers 46, 46 is substantially prevented.
8, the large flow resistance caused in this first communication path 48 produces a large damping effect.

On the other hand, when vibrations of high frequency and small amplitude (small displacement) are input, it becomes extremely difficult for the fluid to pass through the first communicating path 48 of the orifice member 8, which has a large flow resistance. The fluid pressure of the incompressible fluid in the two fluid chambers 46 and 46, which is increased or decreased by the vibration input, is:
The flexible movable plate 3 is inserted from both sides through the second communication path 50, the through hole 34, and the through hole 42 of the pocket forming member 40.
6, by vibrating the movable plate 36 in response to such pressure, the pressure fluctuations are alleviated, and the overall dynamic spring constant is prevented from increasing, thereby reducing high-frequency vibrations. It is possible to achieve effective blocking against In addition, by being able to lower the dynamic spring constant at high frequencies in this way, the degree of freedom in the rubber hardness and rubber compounding of the rubber sleeve 4 can also be increased.

In addition, in the fluid-filled bushing assembly having such a structure, the first and second communication passages 48 and 50 serve as orifices that provide different flow resistances to the incompressible fluid.
is cleverly formed by the arc-shaped orifice member 8 that is fitted into the outer circumference of the rubber sleeve 4, and the movable plate 36 that blocks off the second communication passage 50 is also advantageously provided for the orifice member 8. Thus, a fluid-filled vibration damping assembly that can simultaneously satisfy the above-mentioned high damping characteristics in the low frequency range and low dynamic spring constant in the high frequency range has been effectively realized in the bush type. It became possible to do so.

Moreover, in the fluid-filled bushing assembly having the structure described above, a pair of intersleeve segments 12 and 12 are combined into a cylindrical shape and concentrically embedded and arranged within the rubber sleeve 4 constituting the bushing assembly. Therefore, while maintaining low spring characteristics in the axial direction and low spring characteristics in the pattern direction, it is possible to effectively increase the spring characteristics in the direction perpendicular to the axis, thereby achieving the steering stability required for automobile suspension bushings. It is possible to satisfy all demands for sexual improvement.

In this embodiment, continuous rubber seal parts 26 and 28 are formed at the peripheral edges of the pocket part 14 and the fitting groove 16, thereby effectively sealing the gap between the outer cylindrical fitting 6 and the press-fitted outer cylindrical metal fitting 6. Since the seal can be formed, the incompressible fluid sealed in the pocket portion 14 (fluid chamber 46) is advantageously prevented from leaking to the outside.

Next, another embodiment of the present invention will be explained based on FIG. 15 to FIG.
The same reference numerals will be given and the explanation will be omitted.

In this embodiment, unlike the above example, the inner cylinder fitting 2 is not integrally vulcanized and bonded to the inside of the rubber sleeve 4, but the rubber sleeve 4 is integrated with the metal sleeve 10. After being vulcanized and molded, the inner cylindrical fitting 2 is press-fitted inside the rubber sleeve 4 and assembled so as to be positioned concentrically.

By press-fitting the inner cylindrical fitting 2, the portion of the rubber sleeve 4 located inside the intersleeve 52 can be pre-compressed. Therefore, preliminary compression by the drawing operation from the outer cylinder fitting 6 side is performed by the intersleeve 52.
The intersleeve 52 is an integral cylindrical body, as shown in FIGS. The cylinder body has a structure in which notch holes 22 corresponding to the pocket portions 14 are symmetrically formed.

Although the embodiments of the present invention have been described in detail above,
The present invention is not to be construed as being limited to such illustrative examples, and various changes, modifications, improvements, etc. can be made to the present invention without departing from the spirit thereof. .

For example, in the previous example, the movable plate 36 was held by the pocket forming member 40 and placed on the inner surface of the protruding portion of the orifice member 8 that protruded into one of the fluid chambers 46 (pocket portion 14). However, instead of this, a structure may be adopted in which the second communicating path 50 does not have a dead-end structure, and the movable plate 36 is disposed at the opening to the fluid chamber 46. In addition to holding the movable plate 36 in a free state as illustrated, it is possible to restrain the peripheral edge of the movable plate 36,
It is also possible to have a structure in which the fluid chamber can be elastically deformed and displaced by a predetermined distance in response to pressure fluctuations in the fluid chamber.

Further, the movable plate 36 may be made of an elastic material such as rubber, or may be made of a rigid plastic plate or metal plate; however, if the movable plate 36 is provided so as to restrain its surroundings, Needless to say, it is desirable that it be made of an elastic material such as rubber.

Furthermore, the number of fluid chambers 46 formed by the pocket portion 14 provided in the rubber sleeve 4 and the outer cylindrical metal fitting 6 may be three or more, instead of two as shown in the example. There is no problem with the orifice member 8.
The number of communicating passages provided in the first embodiment is not limited to two as shown in the example, but it is also possible to provide three or more communicating passages.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a fluid-filled bushing assembly that is an embodiment of the present invention, and is a view corresponding to the I-1 cross section in FIG. 2, and FIGS. 1A and 1B are explanatory cross-sectional views showing a cross section along ■-■, a cross-section along mm, and a cross-section along rV-IV in FIG. 1, respectively. Fig. 5 is a front view of a vulcanized product made by integrally vulcanizing and molding a rubber sleeve between the inner cylindrical metal fitting and the metal sleeve used in such a fluid-filled bushing assembly, and Fig. 6 is a half of the vulcanized product. A cross-sectional right side view, FIG. 7 is an explanatory cross-sectional view taken along the line ■-■ in FIG. 6, FIG. 8 is a front view showing one of the intersleeve divided bodies embedded in the rubber sleeve, and FIG. FIG. 10 is a front view of the metal sleeve vulcanized and formed on the outer peripheral surface of the rubber sleeve, and FIG.
FIG. 12 is an exploded perspective view of the orifice member, FIG. 13 is a front view of the outer cylindrical fitting to be press-fitted, and FIG. 14 is a right side view thereof. Fig. 15 is a front view of a vulcanized molded product obtained by integrally vulcanizing a rubber sleeve with a metal sleeve used in another embodiment of the present invention, and Fig. 16 is a half-sectional right side view of the product;
Figure 7 is an explanatory diagram of the cross section taken along the line X■-X■ in Figure 16.
Fig. 18 is a front view showing the intersleeve embedded in the rubber sleeve of such a vulcanized product, and Fig. 19 is a front view of the intersleeve embedded in the rubber sleeve of such a vulcanized product.
FIG. 8 is an explanatory cross-sectional view taken along line XIX-XIX in FIG. 8; 2: Inner tube metal fitting 4: Rubber sleeve 6: Outer tube metal fitting 8 Niorifice member 10: Metal sleeve 12: Intersleeve divided body 14: Pocket portion 16: Fitting groove 18: Window portion
20: Notch portion 22: Notch hole 24
: Space 26.28: Rubber seal part 30: First orifice groove 32: Second orifice groove 34: Through hole 36: Movable plate 38: Recess 40: Pocket hole forming member 42: Through hole 46: Fluid chamber 48: First communication path 50: Second communication path 52: Intersleeve

Claims (6)

[Claims] (1) A predetermined metal sleeve is integrally fixed to the outer peripheral surface by integral vulcanization molding, and a plurality of pocket portions are formed in correspondence with a plurality of windows formed at predetermined positions in the circumferential direction of the metal sleeve. Cylindrical rubber elastic bodies provided independently are arranged concentrically on the outside of the inner cylinder member, and a predetermined outer cylinder member is press-fitted onto the outer peripheral surface of the metal sleeve fixed to the rubber elastic bodies. By covering the opening of the pocket portion provided in the rubber elastic body with the outer cylinder member, a plurality of independent fluid chambers are formed, and each of the plurality of fluid chambers is filled with a predetermined incompressible fluid. In a fluid-filled bushing assembly configured to contain a compressive fluid and allow the incompressible fluid to mutually flow between the fluid chambers, a predetermined intersleeve is concentrically embedded within the rubber elastic body, An arcuate orifice member extending from one of the plurality of fluid chambers to the other and forming first and second communication passages that respectively provide different flow resistances to the incompressible fluid is attached to the rubber elastic body. is disposed in the circumferential direction on the outer periphery of the fluid chamber to allow the incompressible fluid to flow between the fluid chambers through the first communication path that provides a relatively large flow resistance. The fluid chambers are arranged so as to block communication between the fluid chambers through the second communication path, which provides a small flow resistance to the fluid chambers, and can be displaced a predetermined distance toward the other fluid chamber according to pressure fluctuations in one of the fluid chambers. A fluid-filled bushing assembly characterized by having a movable plate. (2) A fitting groove in which the arc-shaped orifice member is provided so as to straddle between the pocket portions by cutting out the metal sleeve and forming the outer periphery of the rubber elastic body into a concave groove shape. A first orifice groove having a small cross-sectional area and a second orifice groove having a large cross-sectional area are provided on the outer circumferential surface of the orifice member, and the first and second orifice grooves are fitted into the orifice member. 2. The fluid-filled bushing assembly according to claim 1, wherein said first and second communicating passages are formed by being covered by said outer cylinder member which is press-fitted. (3) The arc-shaped orifice member is made to protrude a predetermined length into one of the fluid chambers with which it is communicated, and the movable plate is provided in the second communication path portion located at the protrusion portion. A fluid-filled bushing assembly according to claim 1 or 2. (4) At the end of the orifice member that protrudes into the one fluid chamber, the second communication path has a dead end structure, and a movable plate storage pocket is provided on the inner surface of the protrusion portion of the orifice member. The second communication path is provided with a through hole passing through the orifice member in the thickness direction and communicates with the movable plate storage pocket, and one of the movable plates accommodated therein. The pressure of the other fluid chamber transmitted through the second communication path is applied to the side surface of the movable plate, and the pressure of the one fluid chamber is applied to the other surface side of the movable plate. 4. A fluid-filled bushing assembly according to claim 3, wherein the fluid-filled bushing assembly is configured to be actuated. (5) An inner sleeve embedded in the rubber elastic body,
The fluid-filled bushing assembly according to any one of claims 1 to 4, which is constituted by a split cylinder or an integral cylinder. (6) An inner sleeve embedded in the rubber elastic body,
It is composed of a pair of substantially semi-cylindrical divided bodies, and the pair of divided bodies are arranged in a cylindrical shape within the rubber elastic body, and a predetermined space is provided between the ends of the pair of divided bodies in the circumferential direction. A fluid-filled bushing assembly according to any one of claims 1 to 4, wherein the fluid-filled bushing assembly is formed with: