JP6761318B2 - Anti-vibration device - Google Patents

Description

The present invention relates to a vibration isolator.

Conventionally, a vibration isolator as shown in Patent Document 1 below has been known. This vibration isolator includes a bracket connected to either one of the vibration generating part and the vibration receiving part, a first mounting member connected to the other, and a tubular second mounting arranged in the bracket. It is equipped with a member. The first mounting member and the second mounting member are connected by an elastic body. In the liquid chamber in the second mounting member, a partition member for partitioning the liquid chamber into a main liquid chamber and a sub liquid chamber is arranged. The partition member is formed with a restricted passage connecting the main liquid chamber and the sub liquid chamber.
In this vibration isolation device, when vibration is input, both mounting members are relatively displaced while elastically deforming the elastic body, and the hydraulic pressure in the main liquid chamber is fluctuated to allow the liquid to flow through the limiting passage to absorb the vibration. And decaying.

Japanese Unexamined Patent Publication No. 2006-64069

By the way, this kind of anti-vibration device may be used in a high temperature environment such as in the vicinity of an automobile engine. In this case, heat is transferred to the second mounting member in the bracket, so that the liquid in the liquid chamber in the second mounting member rises and cavitation occurs, or the adhesive portion between the second mounting member and the elastic body is formed. There was a risk of deterioration.

The present invention has been made in consideration of such circumstances, and an object of the present invention is to provide a vibration isolator capable of suppressing heat transfer to a mounting member arranged in a bracket.

In order to solve the above problems, the vibration isolator of the present invention includes a tubular metal bracket connected to one of the vibration generating portion and the vibration receiving portion, and a first mounting member connected to the other. The elastic body of the tubular second mounting member inserted into the metal bracket, the elastic body connecting the first mounting member and the second mounting member, and the liquid chamber in the second mounting member are elastic. A partition member for partitioning a main liquid chamber and a sub liquid chamber having a body as a part of a partition wall is provided, and a fixing portion for fixing the second mounting member is formed on the metal bracket, and the second mounting is performed. A fixed portion to be fixed to the fixed portion of the metal bracket is formed on the member, and a portion of the outer peripheral surface of the second mounting member that avoids the fixed portion and an inner peripheral surface of the metal bracket. A gap is provided between the portion avoiding the fixed portion, and a heat insulating member and a rigid body portion having a hardness higher than that of the heat insulating member are disposed between the fixed portion and the fixed portion. It is characterized by that.

According to the anti-vibration device of the present invention, a gap extending continuously over the entire circumference is provided between the inner peripheral surface of the metal bracket and the outer peripheral surface of the second mounting member, and the fixing portion of the metal bracket is fixed. A heat insulating member is arranged between the second mounting member and the fixed portion of the second mounting member. By disposing the gap and the heat insulating member between the metal bracket and the second mounting member in this way, it is possible to suppress heat transfer from the metal bracket to the second mounting member.
Further, since a rigid body portion having a hardness higher than that of the heat insulating member is arranged between the fixed portion and the fixed portion together with the heat insulating member, the heat insulating member is sandwiched between the fixed portion and the fixed portion during assembly and is large. Compression deformation is suppressed. As a result, the shrinkage deformation of the heat insulating member over time when the vibration isolator is used is suppressed to a small extent, so that rattling between the metal bracket and the second mounting member is suppressed, and the space between the metal bracket and the second mounting member is suppressed. The above-mentioned heat insulating effect can be maintained by securing a gap between the two.

Here, a plurality of the rigid body portions may be arranged at intervals in the circumferential direction.

In this case, since a plurality of rigid body portions are arranged at intervals in the circumferential direction, for example, as compared with the case where the rigid body portions are continuously arranged over the entire circumference, the metal bracket is provided through the rigid body portions. It is possible to suppress heat transfer from the second mounting member to the second mounting member.

Further, the gap may be a vacuum sealed space.

In this case, since the gap is a vacuum, it is possible to more reliably prevent heat from being transferred from the inner peripheral surface of the metal bracket to the outer peripheral surface of the second mounting member.

According to the present invention, it is possible to provide a vibration isolator capable of suppressing heat transfer to a mounting member arranged in a bracket.

It is a vertical sectional view of the vibration isolation device which concerns on 1st Embodiment. It is sectional drawing of AA of the vibration isolation device of FIG. FIG. 2 is a cross-sectional view taken along the line BB of the anti-vibration device of FIG. It is a vertical sectional view of the vibration isolation device which concerns on 2nd Embodiment.

(First Embodiment)
Hereinafter, the configuration of the vibration isolator according to the first embodiment will be described with reference to FIG.
As shown in FIG. 1, the vibration isolator 1 includes a tubular metal bracket 20 connected to one of a vibration generating portion and a vibration receiving portion, and a first mounting member 12 connected to the other. Inside the tubular second mounting member 11 inserted into the metal bracket 20, the elastic body 13 connecting the first mounting member 12 and the second mounting member 11, and the second mounting member 11 in which the liquid is sealed. Along the axial direction along the central axis O of the second mounting member 11, the liquid chamber 14 is divided into a main liquid chamber 15 having an elastic body 13 as a part of a partition wall and a partition member 17 for partitioning the liquid chamber 16 into a sub liquid chamber 16. I have. The second mounting member 11 is connected to either the vibration generating portion or the vibration receiving portion via the metal bracket 20.

When this vibration isolator 1 is used, for example, as an engine mount for an automobile, the second mounting member 11 is connected to the vehicle body as a vibration receiving portion via a metal bracket 20, and the first mounting member 12 serves as a vibration generating portion. It is connected to the engine of. As a result, the vibration of the engine is suppressed from being transmitted to the vehicle body. In this way, when the vibration isolator 1 is connected to the engine, the heat of the engine is transferred to the metal bracket 20 and the metal bracket 20 becomes hot.

Here, in the present embodiment, the main liquid chamber 15 side along the axial direction with respect to the partition member 17 is referred to as an upper side, and the sub liquid chamber 16 side is referred to as a lower side. Further, in a plan view of the vibration isolator 1 from the axial direction, the direction orthogonal to the central axis O is referred to as the radial direction, and the direction orbiting around the central axis O is referred to as the circumferential direction.

The first mounting member 12 is formed in a rod shape, and has a mounting shaft 12a arranged coaxially with the central axis O and a disk-shaped connecting plate 12b extending radially outward from the lower end of the mounting shaft 12a. And have. On the outer peripheral surface of the mounting shaft 12a, a male screw portion for connecting the vibration isolator 1 to a vehicle body or the like is formed. The lower surface of the connecting plate 12b is vulcanized and bonded to the upper end surface of the elastic body 13.

The second mounting member 11 includes a main body tubular portion 11a formed in a tubular shape coaxial with the central axis O, and an inclined tubular portion 11b extending upward from the upper end opening edge of the main body tubular portion 11a in the radial direction. , Is equipped. The lower end opening of the main body cylinder portion 11a is crimped inward in the radial direction. The inner peripheral surface of the main body cylinder portion 11a is covered with a covering rubber. The coated rubber is integrally formed with the elastic body 13.

The elastic body 13 is formed of an elastic material such as rubber. The elastic body 13 gradually extends outward in the radial direction from the lower surface of the connecting plate 12b toward the lower side. The outer peripheral side of the elastic body 13 is vulcanized and adhered to the inner peripheral surface of the inclined tubular portion 11b of the second mounting member 11. The upper end opening of the second mounting member 11 is sealed by the elastic body 13.

A tubular diaphragm ring 18 is liquid-tightly fitted in the lower end portion of the second mounting member 11 via a covering rubber. An outer peripheral portion of a disc-shaped diaphragm 19 formed of a rubber material or the like so as to be elastically deformable is vulcanized and bonded to the inner peripheral surface of the diaphragm ring 18. The diaphragm ring 18 is fixed by crimping the lower end portion of the second mounting member 11 inward in the radial direction. The lower end opening of the second mounting member 11 is sealed by the diaphragm 19.
The diaphragm 19 and the elastic body 13 define the liquid chamber 14 in the second mounting member 11 in which the liquid is sealed. As the liquid, for example, water or ethylene glycol can be used.
A lower cylinder portion 19a extending downward is formed on the outer peripheral edge portion of the diaphragm 19. The lower cylinder portion 19a projects downward from the second mounting member 11.

The partition member 17 is formed in a flat disk shape and is fitted in the second mounting member 11. As a result, the liquid chamber 14 in the second mounting member 11 is defined by the main liquid chamber 15 defined by the elastic body 13 and the partition member 17, and the auxiliary liquid chamber 16 defined by the diaphragm 19 and the partition member 17. And, it is divided into. The diaphragm 19 expands and contracts as the liquid flows into and out of the auxiliary liquid chamber 16.

The partition member 17 is formed with a limiting passage 21 that connects the main liquid chamber 15 and the sub liquid chamber 16. The restriction passage 21 communicates with the main liquid chamber 15 and the sub liquid chamber 16 through the main liquid chamber side opening and the sub liquid chamber side opening (not shown) formed in the partition member 17.
When axial vibration is input to the vibration isolator 1, the diaphragm 19 expands and contracts, and the liquid flows between the main liquid chamber 15 and the sub liquid chamber 16 through the limiting passage 21. As a result, the vibration is damped and absorbed.

As the material of the metal bracket 20, for example, aluminum or the like can be used. The metal bracket 20 includes a storage cylinder portion 20a formed in a bottomed tubular shape coaxial with the central axis O, and a fixing portion 20b formed at the upper end portion of the storage cylinder portion 20a.
The main body cylinder portion 11a of the second mounting member 11 is accommodated in the accommodation cylinder portion 20a. The lower cylinder portion 19a of the diaphragm 19 is in airtight contact with the bottom wall of the storage cylinder portion 20a. The air chamber S1 is defined by the upper surface of the bottom wall of the accommodating cylinder portion 20a, the inner peripheral surface of the lower cylinder portion 19a, and the lower surface of the diaphragm 19. For example, atmospheric pressure air is sealed in the air chamber S1.

The fixing portion 20b is formed in an annular shape extending radially outward from the upper end opening edge of the accommodating cylinder portion 20a. A protrusion extending upward (hereinafter referred to as a rigid body portion 20c) is formed on the outer peripheral edge of the fixed portion 20b. As shown in FIGS. 2 and 3, a plurality of rigid body portions 20c are formed on the outer peripheral edge of the fixed portion 20b at intervals in the circumferential direction.

Here, the second mounting member 11 of the present embodiment includes an annular upper flange 11c extending radially outward from the upper end portion of the inclined tubular portion 11b, and extending downward from the outer peripheral edge portion of the upper flange 11c. An upper cylinder portion 11e and a lower flange 11f extending radially inward from the lower end opening edge of the upper cylinder portion 11e are formed. The fixed portion 11g is composed of the upper flange 11c, the upper cylinder portion 11e, and the lower flange 11f. The upper flange 11c and the lower flange 11f sandwich the fixing portion 20b and the rigid body portion 20c of the metal bracket 20 in the axial direction, so that the fixed portion 11g is fixed to the fixing portion 20b. For the lower flange 11f, for example, after setting the fixing portion 20b and the rigid body portion 20c in the upper cylinder portion 11e, the portion of the upper cylinder portion 11e protruding downward from the fixing portion 20b is deformed inward in the radial direction and crimped. Can be formed by
In the present embodiment, the rigid body portion 20c is integrally formed with the metal bracket 20, but the rigid body portion 20c and the metal bracket 20 may be separate bodies.

The outer diameter of the main body cylinder portion 11a of the second mounting member 11 is smaller than the inner diameter of the accommodating cylinder portion 20a of the metal bracket 20. Therefore, a gap S2 is formed between the outer peripheral surface of the main body cylinder portion 11a and the inner peripheral surface of the accommodating cylinder portion 20a. The gap S2 is arranged between a portion of the outer peripheral surface of the second mounting member 11 that avoids the fixed portion 11g and a portion of the inner peripheral surface of the metal bracket 20 that avoids the fixing portion 20b, and is arranged on the entire circumference. It extends continuously over.
Further, an annular heat insulating member 22 is arranged between the upper flange 11c of the fixed portion 11g and the fixing portion 20b in a compressed state. As the material of the heat insulating member 22, for example, a thermoplastic resin, a thermosetting resin, nylon, ceramic or the like can be used. The heat insulating member 22 is arranged between the fixed portion 11g and the fixed portion 20b in a compressed state, and the fixed portion 11g is fixed to the fixed portion 20b, so that the gap S2 becomes a sealed space. There is.
The heat insulating member 22 and the rigid body portion 20c are in contact with both the upper flange 11c and the fixing portion 20b of the fixed portion 11g, respectively.

Further, the gap S2 in the present embodiment is a vacuum sealed space. Since the lower cylinder portion 19a of the diaphragm 19 and the bottom wall of the accommodating cylinder portion 20a of the metal bracket 20 are in close contact with each other, even if the gap S2 is a vacuum sealed space, the inside of the air chamber S1 It is possible to prevent the air from leaking into the gap S2.

As a method of manufacturing the vibration isolator 1 described above, for example, after assembling each member in a vacuum chamber, air is blown into the air chamber S1 from an air hole formed in advance in the bottom wall of the accommodating cylinder portion 20a of the metal bracket 20. It may be injected.
Alternatively, after the vibration isolator 1 is assembled at atmospheric pressure, the inside of the gap S2 may be evacuated by removing the air in the gap S2 from the air holes formed in advance in the peripheral wall of the accommodating cylinder portion 20a. At this time, the vibration isolator 1 may be housed in the vacuum chamber to evacuate the air in the gap S2 with the air holes open, or the air holes may be connected to a decompression device or the like to evacuate the air in the gap S2. You may.

According to the vibration isolator 1 configured as described above, a gap S2 extending continuously over the entire circumference is provided between the inner peripheral surface of the metal bracket 20 and the outer peripheral surface of the second mounting member 11. A heat insulating member 22 is arranged between the fixed portion 20b of the metal bracket 20 and the fixed portion 11g of the second mounting member 11. By disposing the gap S2 and the heat insulating member 22 between the metal bracket 20 and the second mounting member 11 in this way, heat is suppressed from being transferred from the metal bracket 20 to the second mounting member 11. be able to.

Further, since a rigid body portion 20c having a hardness higher than that of the heat insulating member 22 is arranged between the fixed portion 20b and the fixed portion 11g together with the heat insulating member 22, the heat insulating member 22 is fixed to the fixed portion 20b at the time of assembly. It is suppressed that it is sandwiched between the portion 11g and greatly contracted and deformed. As a result, the shrinkage deformation of the heat insulating member 22 over time when the vibration isolator 1 is used is suppressed to a small extent, so that the metal bracket 20 and the second mounting member 11 are suppressed from rattling, and the metal bracket 20 and the second It is possible to secure the gap S2 between the mounting member 11 and maintain the above-mentioned heat insulating effect.

Further, since a plurality of rigid body portions 20c are arranged at intervals in the circumferential direction, for example, as compared with the case where the rigid body portions 20c are continuously arranged over the entire circumference, the rigid body portions 20c are interposed through the rigid body portions 20c. It is possible to suppress heat transfer from the metal bracket 20 to the second mounting member 11.

Further, since the gap S2 is a vacuum sealed space, it is possible to more reliably prevent heat from being transferred from the inner peripheral surface of the metal bracket 20 to the outer peripheral surface of the second mounting member 11.

(Second Embodiment)
Next, the second embodiment according to the present invention will be described with reference to FIG. 4, but the basic configuration is the same as that of the first embodiment. Therefore, the same reference numerals are given to the same configurations, the description thereof will be omitted, and only the different points will be described.

As shown in FIG. 4, the vibration isolation device 10 of the present embodiment includes a second mounting member 23 instead of the second mounting member 11 of the first embodiment.
The second mounting member 23 is made of a material having a lower thermal conductivity than metal and a high heat insulating property. The second mounting member 23 has a main body tubular portion 23a, an inclined tubular portion 23b extending radially outward from the upper end opening edge of the main body tubular portion 23a, and a radial direction from the upper end opening edge of the inclined tubular portion 23b. An annular fixed portion 23c extending outward and a fixed cylinder portion 23d extending downward from the outer peripheral edge of the fixed portion 23c are provided. A plurality of rigid body portions 23e are arranged on the fixed cylinder portion 23d at intervals in the circumferential direction. The rigid body portion 23e is made of metal or the like, and can be arranged on the fixed cylinder portion 23d by, for example, insert molding.

Further, the metal bracket 20 of the present embodiment has an annular lower flange portion 20f extending radially outward from the upper end opening edge of the housing cylinder portion 20a and extending upward from the outer peripheral edge of the lower flange portion 20f. An upper tubular portion 20 g and an annular upper flange portion 20 d extending radially inward from the upper end opening edge of the upper tubular portion 20 g are provided. The fixing portion 20b of the present embodiment is composed of a lower flange portion 20f, an upper cylinder portion 20g, and an upper flange portion 20d.
The fixed portion 23c and the fixed cylinder portion 23d are sandwiched in the axial direction by the lower flange portion 20f and the upper flange portion 20d of the metal bracket 20. As a result, the fixed portion 23c and the fixed cylinder portion 23d are fixed to the fixed portion 20b.

According to the vibration isolator 10 of the present embodiment, since the second mounting member 23 is made of a material having a higher heat insulating property than the metal, the elastic body 13 and the liquid chamber 14 located in the second mounting member 23 It is possible to more reliably suppress the transfer of heat from the metal bracket 20 to the liquid of.
As a result, it is more reliably suppressed that the adhesive portion between the elastic body 13 and the second mounting member 23 rises in temperature and deteriorates, and that the liquid in the liquid chamber 14 rises in temperature and causes cavitation. be able to.

The technical scope of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

For example, in the above-described embodiment, the gap S2 is a vacuum sealed space, but a gas such as air, a liquid or solid heat insulating material, or the like may be sealed in the gap S2.
Further, in the example of FIG. 2, the heat insulating member 22 may be arranged between the plurality of rigid body portions 20c in the circumferential direction.

Further, the shapes of the fixed portion 11g of the second mounting member 11 and the fixing portion 20b of the metal bracket 20 are not limited to the above-described embodiment, and various shapes can be adopted.
For example, in the first embodiment, even when the fixed portion 11g and the fixed portion 20b having a shape different from the shape shown in FIG. 1 are adopted, the rigid body portion 20c and the rigid body portion 20b are sandwiched between the fixed portion 11g and the fixing portion 20b. By disposing the heat insulating member 22, the effect of the present invention can be achieved.

Further, the anti-vibration devices 1 and 10 according to the present invention are not limited to the case where they are used as an engine mount of an automobile, and can be applied to other than the engine mount. For example, it can be applied to the mount of a generator mounted on a construction machine, or it can be applied to the mount of a machine installed in a factory or the like.

In addition, it is possible to replace the components in the above-described embodiment with well-known components as appropriate without departing from the spirit of the present invention, and the above-described embodiments and modifications may be appropriately combined.

1 ... Anti-vibration device 11, 23 ... Second mounting member 11g, 23c ... Fixed part 12 ... First mounting member 14 ... Liquid chamber 15 ... Main liquid chamber 16 ... Sub liquid chamber 17 ... Partition member 20 ... Metal bracket 20b ... Fixed part 20c, 23e ... Rigid body part 22 ... Insulation member

Claims (4)

A bottomed tubular metal bracket connected to either one of the vibration generating part and the vibration receiving part, and a first mounting member connected to the other.
A tubular second mounting member inserted into the metal bracket and
An elastic body connecting the first mounting member and the second mounting member,
A partition member for partitioning the liquid chamber in the second mounting member into a main liquid chamber and a sub liquid chamber having the elastic body as a part of a partition wall.
A diaphragm that defines the auxiliary liquid chamber together with the partition member is provided.
The metal bracket is formed with a fixing portion for fixing the second mounting member.
The second mounting member is formed with a fixed portion to be fixed to the fixed portion of the metal bracket.
A gap is provided between the outer peripheral surface of the second mounting member that avoids the fixed portion and the inner peripheral surface of the metal bracket that avoids the fixed portion.
A heat insulating member and a rigid body portion having a hardness higher than that of the heat insulating member are arranged between the fixed portion and the fixed portion .
The diaphragm is formed with a lower cylinder portion that extends toward the bottom wall of the metal bracket and is in airtight contact with the bottom wall.
A vibration isolation device characterized in that an air chamber is defined by a lower surface of the diaphragm, an inner peripheral surface of the lower cylinder portion, and an upper surface of the bottom wall . The anti-vibration device according to claim 1, wherein a plurality of rigid bodies are arranged at intervals in the circumferential direction. The anti-vibration device according to claim 1 or 2, wherein the gap is a vacuum sealed space. The anti-vibration device according to any one of claims 1 to 3, wherein air is sealed in the air chamber.

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