JP2529414Y2 - Fluid-filled cylindrical mounting device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid-filled cylindrical mounting device which obtains an anti-vibration effect against an input vibration in an axial direction based on a flow action of a fluid enclosed therein, and in particular, switches an anti-vibration characteristic. The present invention relates to a structure of a fluid-filled cylindrical mount device that can be controlled.

[0002]

2. Description of the Related Art Heretofore, as one type of a mounting device which is interposed between members constituting a vibration transmission system and is connected by vibration isolation, an outward flange portion is integrally provided at one axial end. The inner cylinder fitting and the outer cylinder fitting are arranged at a predetermined radial distance from each other with their outward flange portions facing each other at a predetermined distance in the axial direction. Known are those having a structure in which they are connected by an elastic body and exhibiting an anti-vibration effect against axial vibration input between the inner and outer cylinders. It is suitably used as a subframe mount, a body mount, or the like.

[0003] Further, as such a cylindrical mount is required to have a higher level of anti-vibration performance in accordance with the recent sophistication of vehicles, one of the measures is as follows.
The encapsulation of a fluid is under consideration. Therefore, the applicant of the present application has previously disclosed the specific structure of a fluid-filled cylindrical mount in Japanese Patent Application Laid-Open No. 61-165040 and the like. That is, such a fluid-filled cylindrical mount has a structure in which divided fluid chambers divided in the axial direction of the mount are communicated with each other through a fluid flow path between the inner and outer cylindrical fittings, and the vibration in the axial direction is achieved. At the time of input, a low dynamic spring effect can be exerted on the basis of the resonance action of the fluid that is caused to flow between the two divided fluid chambers through the fluid flow path.

By the way, generally, in a mounting device, road noise, harshness, muffled sound, etc. (so-called,
N. V. H), it is desirable to reduce the dynamic characteristics of the mounting characteristics and to improve the vibration insulation, in order to advantageously obtain vibration damping performance against input vibrations in the middle to high frequencies corresponding to H. If the characteristics are too soft, the damping performance against input vibration in the low frequency range will be reduced, and the oscillation and resonance of the members will not be sufficiently suppressed,
This causes a problem that the steering stability of the vehicle is reduced.

[0005] Therefore, in the conventional fluid-filled cylindrical mount, it was difficult to achieve a high level of both vibration isolation performance and vehicle handling stability, and in this respect, it is still sufficiently satisfactory. It was not able to exhibit the anti-vibration characteristics.

[0006]

The present invention has been made in view of the above-described circumstances, and the problem to be solved is to reduce the vibration damping characteristics of the mount by changing the running state of the vehicle and the input vibration. It is an object of the present invention to provide a fluid-filled mounting device having an improved structure, which can be switched according to the conditions and the like, whereby the vibration insulation performance and the vehicle handling stability can be both made highly compatible.

[0007]

SOLUTION] In order to solve the above problem, in the present invention, (a) the end of the one axial, inner tubular member having an outer flange portion extending in the axis-perpendicular direction outward integrally If, (b) the end of the one axial, integrally has an outer flange portion extending perpendicular to the axis outward, distance axially outer flange portion to the outer flange portion of the inner cylindrical member at a release to be opposition position, the outer sleeve disposed at a distance in the axis-perpendicular direction outward of the inner cylindrical member, the outer cylinder and the outer flange portion of (c) the inner cylindrical member A cylindrical first rubber elastic body that is interposed between the facing surfaces of the metal fittings and the outer flange portion and elastically connects the inner cylindrical metal fitting and the outer cylindrical metal fitting,
(D) The inner cylindrical fitting and the outer cylindrical fitting are interposed between opposing surfaces on the axial end side where the outer flange portion is not formed to elastically connect the inner cylindrical fitting and the outer cylindrical fitting. linked to at least a portion of the circumferential direction, extend beauty between the inner tubular member and outer tubular member in the axial direction, the inner tubular member side in the axial direction one end side, the axially other end It is constituted by a thin rubber wall portion connected to the outer cylinder fitting side,
(E) located between the first rubber elastic body and the second rubber elastic body,
An inner portion formed continuously in the circumferential direction between the inner and outer tube fittings.
An annular fluid chamber in which an incompressible fluid is sealed,
(F) a partition member housed and arranged in the fluid chamber to divide the fluid chamber into both sides in the axial direction of the mount, and to form a fluid flow path interconnecting the two divided fluid chambers;
(G) By sealingly connecting the inner cylindrical fitting and the outer cylindrical fitting to the second rubber elastic body on the axially outer side of the thin rubber wall, a seal is provided between the second rubber elastic body and the thin rubber wall. A third rubber elastic body forming a closed working chamber; (h)
By supplying the work for the pressure fluid to such a working chamber, a thin rubber wall in the second elastic body, by bulging deformation in said tubular metal member side or the outer cylinder metal fitting side,
A fluid-filled cylindrical mount device comprising: a working-pressure fluid supply / discharge unit that is brought into contact with the inner surface of the fluid chamber.

[0008]

In the fluid-filled cylindrical mount device having the structure according to the present invention, when the pressure is not applied to the working chamber, the thickness of the second rubber elastic body is reduced. Since elastic deformation of the rubber wall portion can be easily tolerated, a relative volume change occurs between the two divided fluid chambers based on the elastic deformation of the thin rubber wall portion at the time of vibration input, and a fluid flow path is formed. When the fluid flows through the working chamber, a low dynamic spring effect due to the resonance action of the fluid can be effectively exerted. On the other hand, under a state where pressure is applied to the working chamber, the thin rubber wall portion is formed. Is pressurized (swelled) by the working pressure fluid to increase the fluid pressure in the fluid chamber, thereby making the spring hard and causing the thin rubber wall to abut against the fluid chamber surface radially opposed. By being Since the deformation is prevented, and flow of fluid is suppressed in the fluid chamber, so that the mounting spring characteristics can more be more rigid.

Therefore, in the fluid-filled cylindrical mount device having such a structure, a soft spring characteristic can be exhibited in a state where no pressure is applied to the working chamber.
While excellent vibration isolation effect can be exerted, by applying pressure to the working chamber, it can be switched to hard spring characteristics, and excellent damping effect can be exerted.
When applied to automotive mounts, by controlling the supply and discharge of the working pressure fluid to the working chamber according to the input vibration and the running state of the vehicle, both the vibration isolation performance and the vehicle handling stability are highly achieved. Can be done.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to clarify the present invention more specifically, embodiments of the present invention will be described in detail with reference to the drawings.

First, FIGS. 1 to 3 show a specific example in which the present invention is applied to a rear suspension member mount for an automobile. In this figure, reference numeral 10 denotes an inner cylindrical fitting, and an outer cylindrical fitting 12 is coaxially arranged at a predetermined distance outwardly of the inner cylindrical fitting. The metal fitting 12 is integrally and elastically formed by a first rubber elastic body 14, a second rubber elastic body 16 and a third rubber elastic body 17 substantially interposed between the metal fittings 10, 12. Are linked together. In such a member mount, the vertical direction in FIG. 1 is the vehicle vertical direction, and FIG.
The inner cylinder fitting 10 is attached to the vehicle body main body while the outer cylinder fitting 12 is attached to the rear suspension member (subframe) in a state where the middle vertical direction and the left-right direction are the vehicle front-rear direction and the left-right direction, respectively. As a result, it is interposed between the suspension members and the vehicle body main body.

More specifically, the inner tube fitting 10 is shown in FIG.
As shown in FIG. 2, the entirety has a substantially thick cylindrical shape, and radially protruding portions 18 protruding outward are provided at portions opposed in one radial direction. Further, a cylindrical metal sleeve 20 is coaxially arranged at a predetermined distance outside the inner cylindrical metal fitting 10 in the radial direction. The second rubber elastic body 16 having a substantially cylindrical shape as a whole is interposed between the inner cylindrical metal fitting 10 and the metal sleeve 20. The inner cylinder fitting 10 is formed on the surface, and the metal sleeve 20 is formed on the outer peripheral surface thereof by vulcanization bonding.

Further, in the second rubber elastic body 16 constituting the first integrally vulcanized molded product 22, the inner cylindrical metal fitting 1 is provided.
0 is sandwiched in the direction opposite to the radial projections 18, 18, and the portion opposed in the radial direction is a thick portion 30 filled with rubber between the opposed surfaces of the inner cylinder fitting 10 and the metal sleeve 20.
In addition, a regulating plate 24 is integrally vulcanized and bonded to a radially central portion of each of the thick portions 30, 30 in a buried state. As a result, the radial spring characteristics of the second rubber elastic body 16 are changed to those thick portions 30,
30 are set hard in the facing direction.

On the other hand, the portions of the second rubber elastic body 16 which are opposed to each other with the inner cylindrical member 10 interposed therebetween in one radial direction orthogonal to the facing direction of the thick portions 30, 30 are each made thinner. A predetermined length extends substantially parallel to the axial direction between the inner cylindrical member 10 and the metal sleeve 20, and one end in the axial direction corresponds to the inner cylindrical member 10, and the other end in the axial direction corresponds to the metal sleeve 20. And thin rubber walls 26, 26 which are respectively fixed. Thereby, in the second rubber elastic body 16, such thin rubber wall portions 26, 26 are provided.
In the part, the elastic deformation can be relatively easily tolerated, and the radial spring characteristic is
The thin rubber walls 26, 26 are set soft in the facing direction. In addition, between these thin rubber wall portions 26, 26 and the inner cylinder fitting 10, respectively,
A recess 28 that opens on one side in the axial direction is formed.

Further, outside the axial end portions of the thin rubber wall portions 26, 26 fixed to the inner cylinder fitting 10 side, they straddle between the inner cylinder fitting 10 and the metal sleeve 20, respectively. The third rubber elastic body 17 is interposed. And, by the third rubber elastic bodies 17, 17,
At one axial end of the thin rubber walls 26, 26, the opening between the inner cylindrical member 10 and the metal sleeve 20 is closed, so that the thin rubber walls 26, 26 and the third rubber elasticity are closed. Between the bodies 17, 17, pocket portions 32 penetrating the metal sleeve 20 and opening on the outer peripheral surface are formed. In short, the metal sleeve 20 is provided with windows 34, 34 at portions located radially outward of the thin rubber walls 26, 26, and the windows 34, 3 are provided.
4, pocket portions 32, 32 formed between the thin rubber wall portions 26, 26 and the third rubber elastic bodies 17, 17
Are each opened. In the present embodiment, as is apparent from the figure, the third rubber elastic bodies 17, 17 are formed integrally with the second rubber elastic body 16.

On the other hand, in the case of the outer tube fitting 12, FIG.
As shown in FIG. 2, the outer flange 36 is formed in a substantially large-diameter cylindrical shape, and integrally has an outer flange portion 36 extending radially outward at one axial end thereof. A substantially annular plate-shaped flange metal fitting 38 is coaxially provided outwardly in the axial direction of the outer cylindrical metal fitting 12 at a predetermined axial distance from the outer flange portion 36. Are arranged. An inner peripheral edge portion of the flange fitting 38 is integrally provided with a mounting tubular portion 40 projecting to one side in the axial direction.

The first rubber elastic body 14 is interposed between the outer cylinder fitting 12 and the flange fitting 38. The first rubber elastic body 14 has a substantially cylindrical shape as a whole, and is interposed between opposing surfaces of the outer flange portion 36 and the flange metal member 38 of the outer cylindrical metal member 12 so that the outer cylindrical metal member 12 It is configured as a second integrally vulcanized molded product 42, which is vulcanized and bonded to the flange fitting 38, respectively. In the second integrally vulcanized molded product 42, the seal rubber layer 44 is formed on the inner peripheral surface of the outer cylinder fitting 12.
However, the mounting rubber layer 46 is integrally formed on the outer peripheral surface, and the outer flange portion 3 of the outer cylinder fitting 12 is formed.
Buffer rubber layers 48 and 50 having a predetermined thickness are integrally formed on the opposing surfaces of the flange 6 and the flange fitting 38, respectively.

In the second integrally vulcanized molded article 42 having such a structure, a third rubber elastic body 17 is provided for the first integrally vulcanized molded article 22. From the axial end opposite to the opposite side, and assembled in the axial direction,
The mounting cylinder 40 of the flange fitting 38 is attached to the inner cylinder fitting 10.
Of the outer cylinder 12
Are externally fitted to the metal sleeve 20 and caulked and fixed at the axial end, thereby being integrally connected.

Further, by assembling the first and second integrally vulcanized molded products 22, 42, the first and second rubber elastic members 14, 42 are provided between the inner cylindrical member 10 and the outer cylindrical member 12. 16
An annular closed chamber that is continuous in the circumferential direction and that is defined on both sides in the axial direction is formed including the recesses 28 provided in the first integrally vulcanized molded product 22. . Then, a fluid chamber is formed by filling a predetermined incompressible fluid into the closed chamber. In addition,
Such incompressible fluids include, for example, water, alkylene glycol, polyalkylene glycol, silicone oil,
Alternatively, a mixture thereof or the like can be suitably adopted. Also,
The sealing of such a fluid into the fluid chamber can be advantageously performed, for example, by assembling the first and second integrally vulcanized molded products 22, 42 in such a fluid. Become.

Further, in the fluid chamber, when the first and second integrally vulcanized molded products 22 and 42 are assembled, an annular partition block 56 is provided with the second integral vulcanized molded product 42. By being inserted inside, it is accommodated and arranged at an axially intermediate portion of the fluid chamber in a state of being abutted against and supported by the inner peripheral surface of the fluid chamber. Thus, the inside of the fluid chamber is partitioned on both sides in the axial direction with the partition block 56 interposed therebetween, and a pair of divided fluid chambers 58 and 60 are formed. An annular stenosis flow path 54 is formed radially inward of the partition block 56, and the flow of fluid between the divided fluid chambers 58 and 60 can be permitted through the stenosis flow path 54. ing.

On the other hand, by assembling the first and second integrally vulcanized molded products 22 and 42 as described above, the window portions 34 and 40 of the metal sleeve 20 constituting the first integrally vulcanized molded product 22 are assembled.
By closing the pocket 34 and sealing the pocket portions 32, 32, the working chambers 62, 62 are formed therein.
Further, a predetermined working fluid is sealed in each of the working chambers 62, 62, and the inside of the working chambers 62, 62 is connected to a fluid supply / discharge unit 66 through a connection pipe 64 which is arranged through the outer tube fitting 12. It is connected to the. Then, the working fluid is pressure-fed to each working chamber 62 by the fluid supply / discharge means 66, so that the internal pressure of the working chamber 62 is maintained at a high pressure or the working fluid is freely supplied to each working chamber 62. By permitting entry and exit, the working chamber 62 can be maintained at approximately atmospheric pressure and can have a variable volume. The working fluid is divided fluid chamber 5
Incompressible fluids such as air can be used in addition to various incompressible fluids similar to those sealed in the pumps 8 and 60, and the fluid supply / discharge means 66 can be adapted to the type of the working fluid. Accordingly, a supply / discharge pump including a switching mechanism, a valve, and the like, an air pressure source, and the like can be employed.

That is, in the member mount having such a structure, when the high pressure is not applied to the working chamber 62 and the change in the volume of the working chamber 62 is allowed, the divided fluid chambers are separated. 58, a thin rubber wall constituting the wall
Since the deformation of the fluid chambers 6 and 26 can be easily tolerated, the relative volume change between the two divided fluid chambers 58 and 60 is advantageous when an axial vibration is input between the inner and outer cylinder fittings 10 and 12. And the two divided fluid chambers 58, 60
The flow of the fluid through the constricted flow path 54 is caused between them, so that a low dynamic spring effect can be exerted based on the resonance action of the fluid. In addition,
The vibration frequency range in which the low dynamic spring effect based on the resonance action of the fluid can be exerted can be tuned by adjusting the size, length, and the like of the constricted flow passage 54. It is possible to advantageously obtain a vibration insulating effect against medium or high frequency vibrations such as road noise and road noise.

On the other hand, when a high pressure is applied to the inside of the working chamber 62, as shown in FIG. 6, the internal pressure of the working chamber 62 is applied to the thin rubber walls 26, 26, so that the inner diameter in the mount radial direction is reduced. The fluid chamber 5 is swelled and deformed.
The internal pressure at 8, 60 is increased, the spring of the thin rubber wall 26 is hardened, and the thin rubber wall 26 is brought into contact with the fluid chamber surface on the inner cylinder fitting 10 side.
The deformation is suppressed or suppressed. That is, this prevents a large change in the volume of the divided fluid chamber 58 and prevents the fluid from flowing between the divided fluid chambers 58 and 60. Therefore, the inner and outer cylinder fittings 10 and 10 with such fluid flow are prevented. The resistance spring against the relative displacement in the axial direction of twelve is increased, so that a hard spring characteristic in the axial direction can be exhibited.

Therefore, according to such a member mount, the action chamber is required only when high vibration damping performance and high dynamic spring characteristics are required, such as when inputting low-frequency vibration such as shake or bounce, or when cornering a vehicle. By increasing the internal pressure of the working fluid by supplying the working fluid to the inside of the working fluid 62, the divided fluid chambers 58, 60 can be operated in a state where no pressure is applied to the working fluid 62.
Demonstrated based on the resonance action of the fluid sealed inside,
This makes it possible to suppress the resonance of the members and the rolling displacement of the vehicle while sufficiently securing the excellent vibration insulation performance against the input vibration in the middle to high frequency range, thereby exhibiting the excellent steering stability of the vehicle.

In the member mount according to the present embodiment, the partition member for partitioning between the divided fluid chambers 58 and 60 is constituted by an annular partition block 56. Since the fluid flow path (constriction flow path 54) is formed between the outer peripheral surface of the inner cylindrical fitting 10 and the outer peripheral surface, a special member for forming the fluid flow path is not required, and Since only the partition block 56 needs to be inserted and arranged in the fluid chamber, there is an advantage that the structure is extremely simple and the manufacture is easy.

Further, in the member mount according to the present embodiment, radial portions of the second rubber elastic body 16 which are orthogonal to each other are formed as the thick portions 30, 30 and the thin rubber wall portions 26, 26. Therefore, it is possible to set the spring ratio in the mount radial direction orthogonal to each other to be high, whereby the spring characteristics in the vehicle front-rear direction can be set sufficiently softer than in the vehicle left-right direction. It is possible to achieve a higher level of compatibility between ride comfort and steering stability.

In the member mount according to the present embodiment, the second rubber elastic body 16 constituting the thin rubber wall 26 and the working chamber 62 are formed in cooperation with the thin rubber wall 26. Since the third rubber elastic body 17 is integrally formed, simplification of the structure and improvement of manufacturability can be advantageously achieved.

Although the embodiment of the present invention has been described in detail above, this is a literal example, and the present invention is not construed as being limited to such a specific example.

For example, in the above embodiment, the third rubber elastic body forming the working chamber can be formed as a separate structure from the second rubber elastic body. By forming the body in an annular shape and inserting it between the inner and outer cylindrical fittings, it is also possible to form a working chamber extending over the entire circumference in the axial outside of the second rubber elastic body. It is.

In the above-described embodiment, the second rubber elastic body 16 is formed as the thin rubber wall portions 26, 26 at portions opposed to each other in one radial direction. It is also possible to configure as a unit.

Further, in the above-described embodiment, the annular partition block 56 is supported by the outer cylinder 12 to partition the divided fluid chambers 58 and 60 and to restrict the narrow flow between the divided fluid chambers 58 and 60 and the inner cylinder 10. Although the structure is such that the passage 54 is formed, such a partition block may be supported on the inner cylinder fitting side to form a stenotic flow path with the outer cylinder fitting.

Further, the specific structure of the partition member for partitioning the divided fluid chambers and forming a fluid flow path communicating the two divided fluid chambers is not limited to that of the above-described embodiment. As disclosed in Japanese Patent Application Laid-Open No. 61-165040, the inner and outer cylinders are elastically connected, and a fluid flow path is formed inside or between the inner and outer cylinders or the outer cylinder. It is also possible to employ a partition member.

In the above embodiment, the thin rubber wall 26
Are connected to the outer cylinder fitting 12 at the axially inner end and to the inner cylinder fitting 10 at the axially outer end, respectively, and the action chamber 62 is disposed radially outward of the thin rubber wall portion 26. On the contrary, the axially inner end of the thin-walled rubber wall portion 26 is located on the inner cylinder fitting 10 side, and the axially outer end is located on the outer cylinder fitting 12 side. It is also possible to form a working chamber on the radially inner side of the thin rubber wall portion 26 by connecting them together.

Further, in the above embodiment, the supply / discharge port for supplying / discharging the working pressure fluid to / from the working chamber 62 is formed on the outer cylinder fitting side. However, depending on the structure of the working chamber, the inner cylinder fitting may be provided. It is also possible to form a supply / discharge port on the side, or a hard member may be fixed to the third rubber elastic body, and the supply / discharge port may be provided there.

In addition, in the above embodiment, a specific example in which the present invention is applied to a rear suspension member mount is shown, but the scope of the present invention is limitedly interpreted by such specific examples. However, the present invention can be advantageously applied to, for example, a sub-frame mount and a body mount.

In addition, although not enumerated one by one, the present invention
Based on the knowledge of those skilled in the art, various changes, modifications, improvements, and the like can be made,
It goes without saying that all such embodiments are included in the scope of the present invention unless they depart from the spirit of the present invention.

[Brief description of the drawings]

FIG. 1 is an explanatory longitudinal sectional view showing an embodiment of a rear suspension member mount for a vehicle having a structure according to the present invention, and is a view corresponding to the II section in FIG. 2;

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a longitudinal sectional view corresponding to FIG. 1, showing a first integrally vulcanized molded product constituting the member mount shown in FIG. 1;

5 is a longitudinal sectional view showing a second integrally vulcanized molded product constituting the member mount shown in FIG. 1.

FIG. 6 is an explanatory sectional view of a main part, showing another operation state of the member mount shown in FIG. 1;

[Explanation of symbols]

10: Inner cylinder fitting 12: Outer cylinder fitting 14: First rubber elastic body 16: Second rubber elastic body 17: Third rubber elastic body 22: First integrally vulcanized molded product 26: Thin rubber wall 30: Thick part 36: Outer flange part 38: Flange fitting 42: Second integrally vulcanized molded product 54: Stenosis channel 56: Partition block 58: Divided fluid chamber 60: Divided fluid chamber 62: Working chamber 66: Fluid Supply and discharge means

Claims (1)

(57) [Scope of request for utility model registration] 1. An inner cylindrical member integrally having an outer flange portion extending outward in a direction perpendicular to the axis at one end in the axial direction, and an outer flange extending outward in a direction perpendicular to the axis at one end in the axial direction. parts integrally has, as outer flange portion is brought into opposed position at a distance in the axial direction relative to the outer flange portion of the inner cylindrical member, in the axis-perpendicular direction outward of the inner cylindrical member An outer cylindrical member arranged at a distance, and interposed between opposing surfaces of an outer flange portion of the inner cylindrical member and an outer flange portion of the outer cylindrical member, the inner cylindrical member; A cylindrical first rubber elastic body that elastically connects an outer cylindrical member, and an opposing surface between the inner cylindrical member and the outer cylindrical member on the axial end side where the outer flange portion is not formed. Interposed in
And those in the cylindrical member and the outer tubular member for elastically connecting at least part of the circumferential direction, inner and between the inner tubular member and the outer tubular member extending beauty axially, in one axial end A second cylindrical rubber elastic body as a whole, which is constituted by a thin rubber wall portion connected to the cylindrical fitting side and to the outer cylindrical fitting side at the other end in the axial direction, respectively, An annular fluid chamber which is located between the elastic body and the second rubber elastic body, is formed continuously in the circumferential direction between the inner and outer cylinders, and has an incompressible fluid sealed therein; A partition member that is housed and disposed in the fluid chamber, divides the fluid chamber into both sides in the axial direction of the mount, and forms a fluid flow path that interconnects the two divided fluid chambers; An inner cylindrical member and an outer cylindrical member at an axially outer side of a thin rubber wall portion of a body; The by elastically connecting, by supplying the third elastic body which forms a sealed working chamber between said thin rubber walls, with respect to such action chamber create a pressure fluid, The thin rubber wall portion of the second rubber elastic body is swelled and deformed toward the inner cylinder fitting or the outer cylinder fitting,
A fluid-filled cylindrical mounting device, comprising: a working-pressure fluid supply / discharge unit that is in contact with an inner surface of the fluid chamber.