JPH11257413A - Anti-vibration device - Google Patents

Abstract

(57) [Problem] To improve the sealing performance of a partition for closing a part of an orifice while reducing manufacturing cost. An elastic body (16) is attached between a top plate (18) and a support cylinder (14) connected to a bottom plate (12). A liquid chamber 26 is formed in the top metal fitting 18, the bottom metal fitting 12, the support cylinder 14, and the like. A partition member 28 is disposed in the liquid chamber 26, and divides the liquid chamber 26 into a pressure receiving liquid chamber 26A and a sub liquid chamber 26B. A groove 30 is formed on the outer periphery of the partition wall member 28, and a notch 4 is formed on the outer peripheral portion of the upper disk 28 </ b> A constituting the partition wall member 28.
6 are formed. A partition 16A is provided at a portion of the elastic body 16 facing the notch 46, and by fitting into the notch 46, a part of the ring-shaped groove 30 is
The circular orifice 40 is closed by 6A.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-vibration device applied to a case where transmission of vibration from an engine mounted on a vehicle is prevented, and to a mount for supporting a member generating vibration. Applicable.

[0002]

2. Description of the Related Art For example, a vehicle has a structure in which a vibration isolator as an engine mount is disposed between an engine of a vehicle serving as a vibration generating unit and a vehicle body serving as a vibration receiving unit. The generated vibration is absorbed by the vibration isolator and is prevented from being transmitted to the vehicle body.

That is, in this vibration isolator, for example, a liquid chamber is located between an elastic body made of rubber and a diaphragm, and a partition member for dividing the liquid chamber into a pair of liquid chambers is installed in the liquid chamber. Further, the partition member is provided with an orifice serving as a restriction passage connecting the two liquid chambers. When the mounted engine operates and generates vibrations, the vibration damping function of the elastic body and the viscous resistance associated with the flow of the liquid in both the liquid chambers through the orifices communicating with the liquid chambers, etc. Absorbs the vibration and prevents the transmission of the vibration.

[0004] On the other hand, as a partition material used here,
Although various structures are conceivable, when a partition material is made of a pressed metal plate, a structure in which two metal plates 112 and 114 are butted together as shown in FIGS. 6 and 7 is adopted. You. And these two metal plates 112,
114, a ring-shaped space is formed, and the metal plate 11 disposed inside such that the portion between the respective entrances 116, 118 of the ring-shaped space to both liquid chambers is closed.
The arc-shaped orifice 120 is formed by forming the partition 114A by deforming a part of the orifice 4 so as to protrude.

[0005]

However, in this structure, since the partition 114A is formed by crushing a part of the metal plate 114 so as to protrude, the mold structure of the mold for forming the partition 114A is complicated. As a result, the manufacturing cost of the vibration isolator increases.

[0006] Further, the press-formed two metal plates 112 and 114 having different shapes are abutted with each other. However, the dimensional accuracy of the metal plates 112 and 114 cannot be sufficiently increased by the press work. , Two metal plates 112, 1
There is a case where a gap is formed between the fourteen and the sealing of the partition part 114A may be poor. Therefore, the leakage of liquid from around the partition 114A causes the orifice 12 which is the original flow path.
There is a possibility that the liquid does not sufficiently flow in the area 0, and the effect of preventing the transmission of vibration is reduced.

As a countermeasure, it is conceivable to close the gap by spot welding or the like around the partition 114A. However, in this case as well, the manufacturing cost increases with the spot welding. become.

The present invention has been made in consideration of the above-described circumstances, and has as its object to provide a vibration damping device that improves the sealing performance of a partition that blocks a part of an orifice while reducing manufacturing costs.

[0009]

According to a first aspect of the present invention, there is provided a vibration isolator which is connected to one of a vibration generator and a vibration receiver, and connected to the other of the vibration generator and the vibration receiver. A second mounting member, an elastic body interposed between these mounting members and capable of being elastically deformed, and a pressure-receiving liquid filled with a liquid which can be expanded and contracted with the elastic body as at least a part of a partition wall A chamber, a sub-liquid chamber that can be expanded and contracted and filled with a liquid, a partition wall member that is disposed between the pressure-receiving liquid chamber and the sub-liquid chamber to partition therebetween and has a ring-shaped space,
A partition portion that is provided so as to protrude from a portion facing the partition wall material of the elastic body and that partially closes a ring-shaped space to form an arc-shaped orifice that communicates between the pressure-receiving liquid chamber and the sub-liquid chamber. It is characterized by.

According to a second aspect of the present invention, there is provided the vibration isolator according to the first aspect, wherein a ring-shaped space is formed along the outer periphery of the partition material, and a part of the partition material is cut out to form the notch in the partition material. The partition is formed such that the partition fits into the notch of the partition wall material.

The operation of the vibration isolator according to claim 1 will be described below. An elastic body is interposed between the first mounting member and the second mounting member, and the liquid is filled in a pressure-receiving liquid chamber that can be expanded and contracted by using the elastic body as at least a part of a partition. Further, a partition member is disposed between the pressure-receiving liquid chamber and the expandable / contractible sub-liquid chamber to partition therebetween.

Further, by projecting a portion of the elastic body facing the partition wall material to form a partition, a part of a ring-shaped space provided in the partition wall material is closed, and an arc-shaped pressure receiving liquid chamber is formed. An orifice communicating with the auxiliary liquid chamber is formed.

As described above, when the vibration is transmitted from the vibration generating portion connected to any of the mounting members, the vibration is transmitted to the elastic body through any of the mounting members, and the vibration is generated by the deformation of the elastic body. Vibration is less likely to be transmitted to the vibration receiving portion side that is absorbed and connected to the other mounting member.

In addition, the pressure receiving liquid chamber expands and contracts with the deformation of the elastic body, and the auxiliary liquid chamber communicated with the pressure receiving liquid chamber via the orifice expands and contracts in accordance with the expansion and contraction. The vibration damping effect based on the viscous resistance of the liquid flow and the liquid resonance can improve the vibration damping effect, and can sufficiently absorb vibrations in a wide frequency range.

Further, since a partition part which forms a circular orifice by closing a part of the ring-shaped space is provided so as to protrude from a part of the elastic body facing the partition wall material, the partition part is elastically deformed. Part of the ring-shaped space is sealed.

[0016] This eliminates the need to deform a part of the partition wall material to form a partition portion, so that the manufacturing cost of the vibration isolator can be reduced without press working or spot welding using a mold having a complicated structure. Is reduced. Further, since the partition portion is elastically deformed and the periphery of the partition portion is hermetically sealed to improve the sealing property, leakage of liquid due to a gap around the partition portion is also eliminated.

The operation of the vibration isolator according to claim 2 will be described below. The present invention has the same effect as the first embodiment. However, in the present invention, a ring-shaped space is formed along the outer periphery of the partition wall material, and a cutout is formed in the partition wall material by cutting out a part of the partition wall material. It was configured to fit.

Therefore, even if a part of the partition member is not deformed, the portion of the orifice between the two orifices into the two liquid chambers can correspond to the partition provided by protruding the portion of the elastic body facing the partition member. By providing a cutout portion by cutting out a part of the partition wall material at the position, it is possible to easily form an arc-shaped orifice simply by fitting them together when assembling the vibration isolator.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a vibration isolator according to the present invention is shown in FIGS. 1 to 5, and this embodiment will be described with reference to these drawings.

As shown in FIGS. 1 and 2 showing the present embodiment, a bottom plate 1 forming the lower side of the vibration isolator 10
In the center of the lower part of the vehicle 2 (not shown),
A bolt 13 for connecting and fixing 0 by screwing a nut (not shown) protrudes. And this bottom plate fitting 1
The periphery of 2 is a cylindrical upright wall 12A, and a support cylinder 14 is disposed at the upper end thereof.

The support cylinder 14 has a disk-shaped flange portion 14A. The outer peripheral end of the flange portion 14A is bent, and the vertical wall 12A of the bottom metal fitting 12 is caulked by the flange portion 14A. The support cylinder 14 is the bottom plate fitting 12
It is stuck to. A cylindrical portion 14B is provided upright at a right angle from the inner peripheral portion of the flange portion 14A of the support cylinder 14, and a resin bracket 20 for connecting to a vehicle body (not shown) is formed in a ring shape on the outer peripheral side. Is formed. A pair of insert fittings 21 each having a female screw for fastening is embedded in the bracket 20.

As described above, the first mounting member is constituted by the bottom metal fitting 12, the support cylinder 14, and the bracket 20 which are fixed to each other.

At the upper center of the support cylinder 14, a top plate 18 as a second mounting member is arranged, and a bolt 19 projects upward from the center of the top plate 18. The protruding bolt 19 is used for connection to the engine, and the engine is fixed by screwing a nut (not shown).

On the other hand, the outer peripheral surface of a rubber elastic body 16 having a cylindrical shape is vulcanized and bonded to the inner peripheral surfaces of the bracket 20 and the cylindrical portion 14B of the support cylinder 14.
Is vulcanized and bonded to the top plate 18. Therefore, the elastic body 16 is interposed and attached between the top metal fitting 18 and the support cylinder 14 fixed to the bottom metal fitting 12.

On the other hand, a diaphragm 22 which is an elastic film made of rubber is fixed by caulking to the flange portion 14A of the support cylinder 14 together with the upright wall 12A of the bottom plate fitting 12, and the diaphragm 22, the support cylinder 14 and the elastic body 16 The space surrounded and formed by the inner wall surfaces of these members constitutes the liquid chamber 26. The liquid chamber 26 is filled and sealed with a liquid such as ethylene glycol.

Further, a partition member 28 made of a metal material such as a steel plate is arranged in the liquid chamber 26.
The liquid chamber 26 is divided so as to be divided into a pressure receiving liquid chamber 26A and a sub liquid chamber 26B. For this reason, as shown in FIG. 1, the pressure receiving liquid chamber 26A can be expanded and contracted with the elastic body 16 as at least a part of the partition wall, and the sub liquid chamber 26B is
2, it is possible to expand and contract.

On the other hand, as shown in FIGS. 1 to 3, the partition member 28 is formed of an upper disk 28 formed in a disk shape.
A and a lower disk 28B. That is,
At the center of the lower disk 28B, a joining protrusion 28C is formed, which is circularly projected in two stages, and the top of the joining protrusion 28C is bonded to the lower surface of the upper disk 28A by welding. Are integrated.

Further, since the joining protrusion 28C is formed on the lower disk 28B, a ring-shaped portion is provided along the outer periphery of the partition wall member 28 and between the upper disk 28A and the lower disk 28B. The groove 30 which is a space is formed. Further, an opening 44 is formed through a portion of the joining convex portion 28C facing the groove 30, and an arc-shaped opening 42 is formed on an outer peripheral portion of the upper disk 28A adjacent to the opening 44. Is formed. The opening 44 and the opening 4
2, a notch 46 cut out smaller than the opening 42 is formed in the outer peripheral portion of the upper disk 28A.

On the other hand, a plate-like partition portion 16A is provided at a portion of the elastic body 16 facing the cutout portion 46 so as to protrude from the elastic body 16, and the cutout portion 46 formed in the partition wall member 28 is provided.
When the partition 16A is fitted into this, a part of the ring-shaped groove 30 is closed by the partition 16A to form an arc-shaped orifice 40. The thinned portion 16B of the elastic body 16 closes the outer peripheral side of the orifice 40.

As a result, the orifice 40 having an arc shape is formed.
Is an opening 4 located on the pressure receiving liquid chamber 26A side of the partition wall member 28.
2 and opening 4 located on the side of sub liquid chamber 26B of partition wall material 28
4, the communication between the pressure receiving liquid chamber 26A and the auxiliary liquid chamber 26B is established.

The lower disk 28B constituting the partition member 28
Has an outer peripheral end projecting outward, abutting on the bottom surface of the flange portion 14A of the support cylinder 14 via the elastic body 16, and being caulked and fixed to the flange portion 14A together with the diaphragm 22. Further, an air chamber 48 is provided between the diaphragm 22 and the bottom plate 12 so that the diaphragm 22 can be deformed.

Next, assembling of the vibration isolator 10 of the present embodiment will be described. When assembling the vibration isolator 10 of the present embodiment, first, the support cylinder 14, the top plate 18 and the bracket 20 are manufactured, and the support cylinder 14, the top plate 1
8 and the bracket 20 are placed in a vulcanizing mold and
Are vulcanized to these. Further, separately from this, the upper disk 28A and the lower disk 28B are formed by press working, respectively, and these are welded to produce the partition wall member 28.

Next, in a state where the elastic body 16, the support cylinder 14, and the top plate 18 are immersed in a tank (not shown) in which a liquid is stored, as shown in FIG.
Then, the diaphragm 22 and the bottom plate 12 are overlapped, and they are caulked and fixed. At this time, a notch 46 formed in the partition wall member 28 by cutting a part of the partition wall member 28 is formed.
Then, the partition member 28 is inserted into the support cylinder 14 such that the partition 16A shown in FIG.

From the above, the assembly of the entire structure of the vibration isolator 10 in which the liquid is injected into the liquid chamber 26 is completed.

Next, the operation of the vibration isolator 10 according to the present embodiment will be described. When the engine mounted on the top plate 18 operates, vibration of the engine is transmitted to the elastic body 16 via the top plate 18. The elastic body 16 is deformed and acts as a vibration absorber, and can absorb vibration by a vibration damping function based on internal friction of the elastic body 16. The pressure-receiving liquid chamber 26A expands and contracts in accordance with the deformation of the elastic body 16, and the auxiliary liquid chamber 26B that communicates with the pressure-receiving liquid chamber 26A via the orifice 40 expands and contracts by the deformation of the diaphragm 22. , Pressure receiving liquid chamber 26A and auxiliary liquid chamber 26B
A pressure change and a flow occur in the liquid inside.

For this reason, the vibration is absorbed by the deformation of the elastic body 16, the change in pressure of the liquid, the viscous resistance of the liquid flow based on the flow, and the damping effect by the liquid resonance, thereby improving the vibration damping effect.
Vibration is hardly transmitted to the vehicle body side, and vibration of a wide range of frequencies can be sufficiently absorbed.

The portion of the elastic body 16 facing the partition wall member 28 is projected to form the partition 16A, so that the partition wall member 2
The orifice 40 that communicates between the arc-shaped pressure-receiving liquid chamber 26A and the sub-liquid chamber 26B is formed by closing a part of the groove 30 which is a ring-shaped space provided in 8.

That is, since the partition 16A is formed of the elastic body 16, a part of the ring-shaped space is sealed while the partition 16A is elastically deformed. This eliminates the necessity of forming a partition part by deforming a part of the partition wall material as in the prior art, thereby preventing the partition wall material from being pressed or spot-welded using a mold having a complicated structure. The manufacturing cost of the vibration device 10 is reduced. Also, the partition 16
Since A is elastically deformed and the periphery of the partition 16A is hermetically sealed and the sealing property is improved, leakage of liquid due to a gap around the partition 16A is also eliminated.

Further, in the present embodiment, the ring-shaped groove 30 is formed along the outer periphery of the partition wall member 28, and a part of the partition wall member 28 is cut out to form the notch 4 in the partition wall member 28.
6 was formed, and the partition 16A was fitted into the cutout 46 of the partition wall member 28.

That is, even if a part of the partition member 28 is not deformed, the two liquid chambers 2 correspond to the partition 16A provided by protruding the portion of the elastic body 16 facing the partition member 28.
Since a notch 46 is provided at a position between the openings 42 and 44 which are the entrances and exits of the orifice 40 to 6A and 26B,
At the time of assembling the vibration isolator 10, the arc-shaped orifice 40 can be easily formed simply by fitting them together.

Accordingly, since the orifice 40 is formed in an arc shape along the outer periphery of the partition wall member 28, the orifice 40 can be formed longer.

In the above embodiment, the upper disk 28A and the lower disk 28B constituting the partition member 28 are each made of steel. However, other metal materials such as aluminum, for example, may be used, or the resin may be made of resin. May be adopted.

Further, in the above-described embodiment, the orifice is formed in an arc shape, but may be formed in a simple arc shape, and the length of the orifice 40 can be adjusted by changing the thickness of the partition portion 16A. .

On the other hand, in the above embodiment, the bottom plate fitting 12 serving as the first mounting member is connected to the vehicle body serving as the vibration receiving portion, and the top plate fitting 18 serving as the second mounting member is connected to the engine serving as the vibration generating portion. Although the configuration is such that the sides are connected, the configuration may be reversed.

On the other hand, in the above-described embodiment, the purpose is to dampen an engine mounted on a vehicle. However, the anti-vibration device of the present invention is used for, for example, a body mount of a vehicle or other uses other than a vehicle. Needless to say, the shape and size of the elastic body and the number of orifices are not limited to those of the embodiment.

[0046]

As described above, the vibration damping device of the present invention can improve the sealing performance of the partition for closing a part of the orifice while reducing the manufacturing cost. Was.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a vibration isolator according to the present invention.

FIG. 2 is a view taken along arrow 2-2 of FIG.

FIG. 3 is a perspective view showing a partition member applied to an embodiment of the vibration isolator according to the present invention.

FIG. 4 is an explanatory diagram for explaining the assembling of one embodiment of the vibration isolator according to the present invention.

FIG. 5 is a view taken along arrow 5-5 in FIG. 4;

FIG. 6 is a plan view showing a partition member of a vibration isolator according to the related art.

FIG. 7 is a view taken along line 7-7 of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Vibration isolator 12 Bottom plate fitting (1st mounting member) 14 Support cylinder (1st mounting member) 16 Elastic body 16A Partition part 18 Top plate fitting (2nd mounting member) 26A Pressure receiving liquid chamber 26B Sub liquid chamber 28 Partition wall Lumber 40 Orifice

Claims (2)

[Claims] A first mounting member connected to one of the vibration generating section and the vibration receiving section; a second mounting member connected to the other of the vibration generating section and the vibration receiving section; An elastic body interposed therebetween and capable of being elastically deformed; a pressure-receiving liquid chamber capable of expanding and contracting the elastic body as at least a part of the partition wall and being filled with a liquid; A sub-liquid chamber, a partition member disposed between the pressure-receiving liquid chamber and the sub-liquid chamber to partition therebetween, and having a ring-shaped space, and a portion of the elastic body opposed to the partition member protrudingly provided. And a partition part that is an arc-shaped orifice that closes a part of the ring-shaped space and communicates between the pressure-receiving liquid chamber and the sub-liquid chamber. 2. A ring-shaped space is formed along the outer periphery of the partition wall material, a part of the partition wall material is cut out to form a cutout portion in the partition wall material, and the partition portion fits into the cutout portion of the partition wall material. The vibration isolator according to claim 1, wherein the vibration isolator is inserted.