JP2569561Y2 - Partition member for fluid-filled mount - Google Patents

Description

[Detailed description of the invention]

[0001]

TECHNICAL FIELD The present invention is mounted on a fluid-filled mount used as, for example, an engine mount for an automobile,
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a partition member for a fluid-filled mount having a mechanism for dividing a fluid chamber into two divided fluid chambers and having a mechanism for communicating the divided fluid chambers with each other.

[0002]

2. Description of the Related Art Conventionally, as a kind of a vibration-proof connecting member or a support member interposed between members constituting a vibration transmitting system such as an engine mount and a cab mount for an automobile, Japanese Patent Application Laid-Open No. Sho 6
As disclosed in Japanese Patent Publication No. 3-167141, the first support fitting and the second support fitting are connected by a rubber elastic body, and a fluid chamber in which a predetermined incompressible fluid is sealed is provided. There is known a fluid-filled mount in which a partition member is formed in the fluid chamber and the fluid chamber is partitioned into two divided fluid chambers located on both sides of the partition member.

[0003] A partition member employed in such a fluid-filled mount has a first partition plate and a second partition plate each having a circular outer periphery overlapped with each other. A movable film formed of a rubber elastic body is accommodated and arranged in a small space so that it can be displaced,
An annular thick portion integrally formed on the outer peripheral edge of the movable film is sandwiched between the two partition plates, and the inside of the space is radially partitioned, so that the outer peripheral side of the annular thick portion is slightly less than one round. Orifice passage is formed. That is, an annular thick portion that serves both as the innermost peripheral wall of the orifice passage and the inner peripheral side seal is formed integrally with the rubber elastic body of the movable film. The damping effect at the time of low-frequency vibration input is exerted based on the resonance action of the fluid flowing through the orifice passage, while the medium or high-frequency vibration input is performed based on the internal pressure difference absorption action of the two divided fluid chambers due to the displacement of the movable membrane. At this time, the rise of the dynamic spring is reduced (lower dynamic spring).

In such a fluid-filled mount, it is effective to reduce the rubber hardness of the movable film as much as possible in order to reduce the dynamic spring against medium to high frequency vibrations. In order to improve the damping effect on low-frequency vibration, it is effective to increase the cross-sectional area and length of the orifice passage to increase the resonance mass of the fluid.
The rigidity and sealing properties of the peripheral wall of the orifice passage are required.

However, in the structure in which the inner peripheral wall of the orifice passage is formed integrally with the movable film as described above,
In the case where a further low dynamic spring in medium to high frequency vibration and a larger damping effect in low frequency vibration are required, it has been difficult to achieve the required characteristics.

[0006]

The present invention has been made in view of the above-mentioned circumstances, and a problem to be solved is that the first and second partition plates do not require high dimensional accuracy and the orifice passage is not required. An object of the present invention is to provide a partition member for a fluid-filled mount that can improve both a low frequency vibration damping effect and a low dynamic spring of medium to high frequency vibration while preventing a short circuit and a fluid leak.

[0007]

According to the present invention, there is provided a fluid-filled mount partition having an orifice passage and a movable member capable of small displacement as described above. The two partition plates are superimposed on each other, and the movable member formed of a rubber elastic body is movably accommodated and arranged in a space formed between the superposed surfaces of the two partition plates,
An annular step formed independently of the movable member by a rubber elastic body having a higher rubber hardness than the movable member, and having an inner peripheral shaft end formed on at least one of the partition plates. A cylindrical partition body, which is locked to the portion and is held between the two partition plates located outside the movable member by a pressure, so as to radially partition the space, thereby forming the cylindrical partition body. The fluid-filled mount partition member, wherein the orifice passage extending in the circumferential direction is formed on the outer peripheral side of the mount.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

First, FIG. 1 shows an engine mount 12 having a partition member 10 as one embodiment of the present invention. A first support fitting 14 and a second support fitting 16 attached to one of the power unit side and the body side are connected to the engine mount by a rubber elastic body 18. The first support member 14 has a truncated cone shape, and a mounting bolt 20 protruding upward is fixed at the center of the first support member 14.

The second support member 16 includes a cylindrical member 22 having a substantially cylindrical shape and a bottom member 24 having a substantially cylindrical shape with a bottom. And, those tube fittings 22
And the bottom fitting 24 are overlapped in the axial direction, and the caulking portion 26 provided at one axial opening of the cylindrical fitting 22 is caulked and fixed to the flange portion 28 provided at the opening of the bottom fitting 24. . Furthermore, mounting bolts 30, 30 protruding downward are fixed to the bottom of the bottom fitting 24.

The first support member 14 is arranged opposite to the opening of the second support member 16 at a predetermined distance, and a rubber elastic body 18 is interposed between them. ing. The rubber elastic body 18 has a substantially frustoconical shape, and the first support member 14 is provided on the small-diameter side end surface thereof, and the cylindrical metal member 22 constituting the second support member 16 is provided on the large-diameter side end surface thereof.
Are respectively vulcanized and adhered. Thereby, the first support fitting 14 and the second support fitting 16 are elastically connected, and the opening of the second support fitting 16 is fluid-tightly closed by the rubber elastic body 18.

Further, inside the second support fitting 16,
A diaphragm 32 is accommodated and arranged, and a mounting bracket 34 is provided.
Is fixed to the second support fitting 16 by being clamped by the caulking portion of the tubular fitting 22 and the bottom fitting 24. The inside of the second support member 16 is fluid-tightly partitioned by the diaphragm 32, whereby the diaphragm 32 and the rubber elastic body 18 are separated.
A fluid chamber 36 filled with a predetermined incompressible fluid is formed between the fluid chambers 36, and on the opposite side of the fluid chamber 36,
An air chamber 38 that allows deformation of the diaphragm 32 is formed.

As the fluid in the fluid chamber 36, for example, water, alkylene glycol, polyalkylene glycol, silicone oil or the like is used. The sealing of the fluid in the fluid chamber 36 can be advantageously performed, for example, by fitting the diaphragm 32 into the integrally vulcanized molded product of the rubber elastic body 18 and caulking and fixing the bottom fitting 24 in the fluid. .

The fluid chamber 36 thus formed is
The partitioning member 10 is accommodated and arranged inside. The partitioning member 10 has a thick, substantially disk shape as a whole, and its outer peripheral edge is formed together with the diaphragm 32 along with the cylindrical fitting 22.
Is fixed to the second support bracket 16 by being clamped by the caulking portion of the bottom bracket 24. The fluid chamber 36 is divided into two parts by the partition member 10. Due to this, a part of the wall is formed of the rubber elastic body 18 above the partition member 10, and the internal pressure varies when a vibration is input. While the chamber 40 is formed, an equilibrium chamber 42 in which a part of a wall portion is constituted by the diaphragm 32 and whose volume change is allowed is formed on the lower side. In this embodiment, the pressure receiving chamber 40 and the equilibrium chamber 42 constitute two divided fluid chambers.

More specifically, this partitioning member 10 is shown in FIG.
As shown in the plan view and the sectional views in FIGS. 3 and 4, respectively, the upper plate fitting 44 as a first partition plate formed by press molding or the like, and the second partition plate Lower sheet metal fitting 46 and intermediate sheet metal fitting 4
8 are included.

The upper metal plate 44 has a substantially circular flat plate shape, and its central portion in the radial direction is curved downward to form an annular first step 50 protruding downward. In addition, this upper plate metal fitting 44 has a central portion,
Four through holes 52 are provided, and the first step portion 5 is provided.
The communication hole 54 is provided at a position radially outward from the zero.

The lower metal plate 46 has a shallow cup shape which opens upward, and a flange 56 is formed at the periphery of the opening. The radial center of the bottom wall 58 is curved upward. The annular second step portion 60 which is projected upward
Are formed. And, in this lower plate metal fitting 46,
Four through holes 52 similar to the upper metal plate 44 are provided in the center of the bottom wall 58, and a communication hole 64 is provided in the outer peripheral edge of the bottom wall 58.

Further, the intermediate metal plate 48 has a substantially annular plate shape, and its inner peripheral edge is curved downward to form an annular projection 66 protruding downward. The communication hole 6 is formed in the bottom wall of the annular projection 66.
A notch hole 70 having a predetermined width in the circumferential direction at a depth reaching the bottom wall portion is provided in the inner peripheral wall at a position slightly shifted from the communication hole 68 in the circumferential direction.

The upper metal plate 44, the intermediate metal plate 48, and the lower metal plate 46 are overlapped in the axial direction, and the outer peripheral edges of the upper metal plate 44 and the intermediate metal plate 48 are brought into contact with each other. The outer peripheral edge of the intermediate metal plate 48 is brought into contact with the flange portion 56 of the lower metal plate 46,
The abutting portions of these sheet metal fittings are clamped by the caulking portions of the tubular metal fittings 22 and the bottom metal fittings 24, so that the engine mount 12
(See FIG. 1).

A space is formed between the superposed surfaces of the upper metal plate 44 and the lower metal plate 46 which are superimposed as described above, and a thick part as a movable part as a whole is formed at the center thereof. A rubber movable plate 72 having a disk shape is accommodated and arranged to be freely movable.

The outer diameter of the rubber movable plate 72 is smaller than the outer diameters of the first and second step portions 50 and 60 which are opposed to each other in the axial direction of the upper metal plate 44 and the lower metal plate 46. The outer peripheral edge is formed with an outer peripheral annular projection 74 which is set to have a total height in the axial direction which is slightly smaller than the inner dimension of the first and second steps 50 and 60 in the axial direction. And
Upper sheet metal fitting 44 inside the first and second step portions 50 and 60
Between the opposing surfaces of the lower metal plate 46 and the rubber movable plate 72.
A central projection 76 and an annular intermediate projection 7 having a height higher than the outer peripheral annular projection 74 are provided at the central portion and the radial intermediate portion, respectively.
8 are formed so as to protrude. The gaps between the outer peripheral annular projection 74, the central projection 76, the intermediate projection 78, and the axially opposed surfaces of the upper metal plate 44 and the lower metal plate 46 are substantially the same.

Further, on the radially outer side of the rubber movable plate 72, there is provided a rubber partition member 80 having a cylindrical shape provided separately and separately from the rubber movable plate 72. First, in a state where it is positioned by the second step portions 50 and 60, it is disposed so as to be squeezed and held between the upper plate member 44 and the lower plate member 46. The rubber partition 80 is
It is formed of a rubber material having a rubber hardness that is a predetermined amount harder than the rubber movable plate 72. Incidentally, the rubber movable plate 72 of the present embodiment is used.
And the rubber partition body 80 are both formed of NR type rubber material, and the rubber hardness is HsA type hardness, and Hs45.
And Hs60.

The rubber partition 80 divides the space formed between the upper and lower metal plates 44 and 46 in the radial direction, and the outer side of the intermediate metal plate 48 is formed on the outer surface of the rubber partition 80. Since the inner side surfaces are in contact with each other, an annular first flow path 82 extending in the circumferential direction constituted by the upper metal plate 44 and the intermediate metal plate 48, and an inner peripheral wall formed below the partition 80 by the inner peripheral wall.
An annular second channel 84 extending in the circumferential direction is formed.

As shown in FIGS. 5 and 6, the outer peripheral edge of the rubber partition 80 is provided with two first and second flow paths 8 at different positions in the axial direction at two locations on the circumference.
First shut-off portion 8 filled in 2, 84 to block both of these flow paths
6 and a second blocking portion 88 are formed. The first and second blocking portions 86 and 88 define the first and second flow paths 82 and 84.
However, each has a length of less than one round in the circumferential direction. Furthermore, in the circumferential direction, the communication hole 5 of the upper
4, the first blocking portion 86, the communication hole 68 of the intermediate metal plate 48, the second blocking portion 88, the communication hole 64 of the lower metal plate 46 are arranged in this order.
The close proximity of the first and second flow paths 8
2 and 84 are connected in series, and each flow path is communicated with the pressure receiving chamber 40 through the communication hole 54 and with the balance chamber 42 through the communication hole 64, so that the pressure receiving chamber 40 and the balance chamber 42 are mutually connected. An orifice passage 90 communicating with and allowing fluid flow between the two chambers 40 and 42 is formed with a length of less than two turns in the circumferential direction of the partition member 10. The first blocking portion 86 is fitted into the notch hole 70 of the intermediate metal plate 48, and the rubber partition 80 and the intermediate metal member 48 are easily assembled. The rubber partition body 80 has an annular seal lip 81 and a seal extending in the radial direction on the contact surfaces of the upper and lower sheet metal fittings 44 and 46 and the contact surfaces of both the blocking portions 86 and 88 with the intermediate sheet metal fitting 48. A lip 83 is formed.

Accordingly, in the partition member 10 having the above-described structure, the cylindrical rubber partition body 80 is sandwiched between the upper and lower plate fittings 44 and 46, so that the orifice passage 90 and the rubber movable plate 72 are separated. It functions as a sealing material that partitions the arrangement part. Therefore, the orifice passage 90 and the arrangement member of the rubber movable plate 72 are partitioned with sufficient liquid tightness, and short circuit of the orifice passage 90 is prevented. Since the movable plate 72 is formed of a rubber material having a high rubber hardness and separated from the movable plate 72, the space between the upper and lower plate fittings 44 and 46 is lengthened in the axial direction as in the present embodiment, and the orifice passage 90 is formed. When the sectional area of the forming space is increased, the rigidity of the rubber partition 80 can be secured without increasing the thickness in the radial direction, so that the space for disposing itself can be effectively reduced, and the orifice The resonance mass of the fluid in the passage can be advantageously increased.

Also, the rubber movable plate 72 is provided with the upper and lower plate fittings 4.
Since the arrangement state is such that the space between the fluid chambers 4 and 46 can move freely, the spring rigidity due to the small displacement of the rubber movable plate 72 itself at the time of absorbing the internal pressure difference between the two divided fluid chambers in the middle to high frequency vibration. Is not added as a transmission force to the connected member, so that a low dynamic spring can be advantageously exhibited. Then, as in the present embodiment, the rubber movable plate 72 is used.
Has a projection form in which an outer peripheral annular projection 74, a central projection 76, and an intermediate projection 78 projecting in the vibration direction are dispersedly arranged, and is thickened as a whole. In combination with the soft spring stiffness based on the low rubber hardness, the occurrence of a tapping sound at the time of contact with the upper and lower metal fittings 44 and 46 can be reduced or suppressed.

Further, the rubber partition member 80 has a radially inner portion provided with first and second step portions 50 of the upper and lower metal plates 44 and 46.
60, the outer periphery in the radial direction is constrained by the inner side surface of the intermediate metal plate, and the entire circumference is held and positioned between the upper and lower metal plates 44, 46. The attachment to the sheet metal fittings 44 and 46 can be easily performed with excellent positioning properties, whereby the assemblability to the engine mount and the performance can be stabilized.

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

For example, the partition member 10 can be mounted on the engine mount 12 with the first flow path 82 communicating with the equilibrium chamber 42 and the second flow path 84 communicating with the pressure receiving chamber 40, respectively.

Further, it is also possible to form an orifice passage having a large cross-sectional area of less than one round in the circumferential direction by the upper and lower metal plates 44 and 46 without disposing the intermediate metal plate 48.

Further, in the above embodiment, the first partition and the second partition are both constituted by plate-like metal fittings formed by press molding or the like.
One or both of the second partition members may be formed of a hard material such as a rigid resin.

In addition, the present invention can be applied to a partition member mounted on a cab mount, a body mount, or various fluid-filled mounts other than automobiles, in addition to the engine mount as illustrated.

The present invention can be implemented in various forms without departing from the gist of the present invention.

[0034]

According to the present invention, in a partition member mounted on a fluid-filled mount having a structure according to the present invention, a cylindrical partition member formed of a rubber elastic body is provided between the first and second partition plates. By being pinched, the first and second partition plates can secure the sealing performance of the orifice passage by the cylindrical partition body without requiring high dimensional accuracy, thereby preventing short circuit of the orifice passage. As a result, a stable vibration damping effect can be exhibited.

Further, the cylindrical partition body is formed of a rubber elastic body having a high rubber hardness different from that of the movable member.
Since the rigidity of the inner peripheral wall constituting the orifice passage can be secured without increasing the installation space of the orifice passage, the cross-sectional area and length of the orifice passage can be advantageously increased, and the low frequency vibration damping effect can be obtained. Can be improved.

Further, since the movable member is movably disposed in the space between the first and second partition plates, the movable member can be made small when absorbing the internal pressure difference between the two divided chambers in the middle to high frequency vibration. Since the spring stiffness accompanying the displacement is not added as a transmission force to the connected member of the fluid-filled mount, a reduction in dynamic spring can be advantageously exhibited.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an engine mount on which a partition member is mounted as one embodiment of the present invention, and is a view corresponding to a II section in FIG. 2;

FIG. 2 is a plan view of a partition member mounted on the engine mount shown in FIG.

FIG. 3 is a III-III plane view in FIG. 2;

FIG. 4 is a sectional view taken along the line IV-IV in FIG. 2;

FIG. 5 is a plan view of a cylindrical partition member constituting the partition member shown in FIG.

6 is a sectional view taken along line VI-VI in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Partition member 12 Engine mount 36 Fluid chamber 40 Pressure receiving chamber 42 Equilibrium chamber 44 Upper metal plate 46 Lower metal plate 48 Intermediate metal plate 50 First step part 52 Through hole 54, 64, 68 Communication hole 60 Second step part 70 Notch hole 72 Rubber movable plate 80 Rubber partition body 82 First flow path 84 Second flow path 90 Orifice passage

Claims (1)

(57) [Scope of request for utility model registration] 1. A fluid-filled mount having a fluid chamber in which a predetermined incompressible fluid is sealed, the fluid chamber is divided into two fluid chambers, and the fluid chambers communicate with each other. And a movable member capable of small displacement based on the internal pressure difference between the two divided fluid chambers, wherein the first and second partition plates are overlapped with each other. The movable member formed of a rubber elastic body is movably housed and disposed in a space formed between the overlapping surfaces of the two partition plates, and is higher than the movable member independently of the movable member. It is formed of a rubber elastic body having a rubber hardness, and its inner peripheral shaft end is engaged with an annular step formed on at least one of the partition plates, and is located outside the movable member. Cylindrical partition that is held between the two partition plates by a narrow pressure At, by dividing the said cavity in the radial direction, the cylindrical partition body fluid-filled mount the partition member, characterized in that the formation of the orifice passage on the outer circumferential side extending in the circumferential direction of the.