JPH09257089A - Vibration control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the manufacturing cost by a method wherein assembling ability is improved through reduction of the number of part items. SOLUTION: An elastic body 16 made of rubber having a coupling part 16A extending from the periphery of an inner cylindrical metal fitting 14 to the outer cylinder 12 side is disposed between an inner cylinder metal fitting 14 and an outer cylinder 12. A pressure receiving liquid chamber and an auxiliary liquid chamber, separated away from each other by a partition material 28, are arranged below the elastic body 16. The cover material 38 tightly fitted in the wall surface of an opening part 12A of a cylinder part 38A is arranged below a diaphragm 36 forming the wall part of the auxiliary liquid chamber. A space is formed between the wall surface of the opening part 12A and the rise wall part 28A of the partition member 28 throughout one full round of the outer periphery of the partition member 28. The space forms an orifice 30 to intercommunicate the pressure receiving liquid chamber and the auxiliary liquid chamber.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration damping device that absorbs vibrations from a vibration generator, and is applicable to, for example, automobiles, general industrial machines, etc., and is particularly suitable for engine mounts.

[0002]

2. Description of the Related Art For example, a vibration isolator as an engine mount is arranged between an engine of a vehicle which is a vibration generator and a vehicle body which is a vibration receiver, and the vibration generated by the engine is prevented by the vibration isolator. Is absorbed and is prevented from being transmitted to the vehicle body side.

That is, as this vibration isolator, an elastic body made of rubber and a pair of liquid chambers are provided in the vibration isolator, and
It is known that these liquid chambers are communicated with each other through a restricted passage serving as an orifice. When the mounted engine operates and generates vibration, the vibration is absorbed by the vibration damping function of the elastic body and the viscous resistance of the liquid in the orifice communicating with these liquid chambers, and the vibration is transmitted. It is designed to block.

However, conventionally, by pressing a steel material or the like and joining these pressed members by welding or the like, parts such as a bracket for attaching the outer cylinder containing the liquid chamber and the vibration isolator to the vehicle body are provided. Formed and manufactured the anti-vibration device. For this reason, the weight of the vibration isolator itself becomes excessive, and the labor required for manufacturing the vibration isolator becomes excessive. Therefore, due to demands for energy saving and the like, it has become necessary to reduce the weight of the vibration isolator and reduce the number of processing steps.

From the above, it has been considered that the outer cylinder and the bracket are integrated with each other and made into a resin. For example, a pair of liquid chamber and elastic body are arranged inside the outer cylinder integrated with the bracket. A structure in which a restriction passage communicating between the pair of liquid chambers is formed on the outer peripheral side of the elastic body has been considered.

[0006]

However, in such a structure, the sealing metal member for forming the restriction passage on the outer peripheral side of the elastic body is caulked on the outer periphery of the elastic body to form a groove-shaped space serving as the restriction passage. It was necessary to prevent the resin from entering the inside, and then to form an outer cylinder to serve as a bracket on the outer peripheral side thereof. At this time, in order to prevent the elastic body from being deformed by being pushed by the sealing metal fitting, it is necessary to embed a ring-shaped reinforcing metal fitting in the elastic body to reinforce the outer peripheral side of the elastic body.

Therefore, these metal fittings are required, and the manufacturing cost for manufacturing the metal fittings and the assembly cost for assembling these metal fittings in the vibration isolator are required, which causes an increase in the manufacturing cost of the vibration isolator. Was there.

In consideration of the above facts, an object of the present invention is to provide a vibration isolator capable of reducing the manufacturing cost by reducing the number of parts and improving the assembling property.

[0009]

A vibration isolator according to a first aspect of the present invention is an outer cylinder connected to one of a vibration generating portion and a vibration receiving portion and integrally formed of resin while having an opening at at least one end. An inner cylinder connected to the other of the vibration generator and the vibration receiver and arranged inside the outer cylinder, and the outer cylinder and the inner cylinder so as to connect the outer cylinder and the inner cylinder. An elastic body disposed between the elastic body and a pressure receiving liquid chamber in which at least a part of the inner wall is formed of the elastic body and liquid is sealed;
An auxiliary liquid chamber that is formed separately from the pressure receiving liquid chamber and is expandable and contractible; a partition member that is inserted into the opening of the outer cylinder to partition the pressure receiving liquid chamber and the auxiliary liquid chamber; A restriction passage formed by a space between the wall surface of the opening and the partition member and connecting the pressure receiving liquid chamber and the sub liquid chamber.

A vibration isolator according to a second aspect is the vibration isolator according to the first aspect, wherein a diaphragm capable of deforming a part of a wall portion of the sub liquid chamber is formed so as to expand and contract the sub liquid chamber. The diaphragm is fixed by inserting a sealing plate into the opening of the outer cylinder.

The operation of the vibration isolator according to claim 1 will be described below. Since the elastic body connects the outer cylinder and the inner cylinder, and the inner cylinder or the outer cylinder is connected to the vibration generator, when the vibration is transmitted from the vibration generator side to the inner cylinder or the outer cylinder, The body is deformed, and as a result, the deformation of the elastic body attenuates the vibration, and it becomes difficult to transmit the vibration to the vibration receiving portion side connected to the outer cylinder or the inner cylinder.

Further, a pressure receiving liquid chamber in which a part of the inner wall is formed of an elastic body and a sub liquid chamber which is separated from the pressure receiving liquid chamber and can expand and contract are provided, and a liquid is sealed in these liquid chambers.
Further, a partition member is inserted into the opening of the outer cylinder to partition the pressure receiving liquid chamber and the sub liquid chamber, and a limiting passage connecting the pressure receiving liquid chamber and the sub liquid chamber is formed on the wall surface of the opening of the outer cylinder. And a space between the partition member and the partition member.

Therefore, when the vibration is transmitted from the side of the vibration generating portion, the elastic body is deformed, and the pressure receiving liquid chamber is expanded or contracted accordingly, and a pressure change occurs in the liquid in the restriction passage. Not only that, the vibration is attenuated by the pressure change of the liquid, the viscous resistance, etc., and it becomes difficult to transmit the vibration to the vibration receiving portion side.

Further, in manufacturing the vibration isolator according to the present invention, since the outer cylinder is integrally molded with resin, the vibration proof device can be made lighter and it is not necessary to press the outer cylinder. Thus, the processing process is simplified.

Further, since the restricting passage is not arranged on the outer peripheral side of the elastic body, the sealing metal fittings and the reinforcing metal fittings are not required, and the number of parts is reduced. There is no need to install these metal fittings,
The assemblability is improved and the manufacturing cost of the vibration isolator is reduced.

The operation of the vibration isolator according to claim 2 will be described below. This claim can also achieve the same effect as that of claim 1. However, in the present claim, a diaphragm is formed so that a part of the wall of the auxiliary liquid chamber can be deformed so that the auxiliary liquid chamber can be expanded and contracted, and the diaphragm is inserted by inserting a sealing plate into the opening of the outer cylinder. It has a fixed structure. Therefore, the partition member and the diaphragm are securely fixed in the opening of the outer cylinder.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 to 4 show a vibration isolator according to an embodiment of the present invention, and the present embodiment will be described with reference to these drawings.

As shown in FIGS. 1 and 2, the vibration isolator 10 according to the present embodiment includes a bracket-integrated outer cylinder 12 which is integrally molded of synthetic resin and has a screw hole. A bush 13 that is provided is embedded in the outer cylinder 12, and the outer cylinder 12 is screwed to the vehicle body (not shown) side of the automobile as a vibration receiving portion by using the bush 13 so that the outer cylinder 12 becomes a vehicle body. Will be linked to.

Inside the outer cylinder 12, an inner cylinder fitting 14 formed in a tubular shape is arranged so as to be parallel to the axis of the outer cylinder 12, and a bolt (not shown) is screwed into the inner cylinder fitting 14. As a result, the inner tubular member 14 and the engine (not shown) that serves as the vibration generating portion are connected.

On the other hand, an outer peripheral portion 16B formed in a ring shape along the inner peripheral surface of the outer cylinder 12 is provided between the inner cylindrical metal fitting 14 and the outer cylinder 12, and the central portion has an inner cylindrical metal fitting. 14 is vulcanized and bonded to the outer cylinder 12 from the periphery of the inner cylinder metal fitting 14
An elastic body 16 made of rubber having a connecting portion 16A extending in a beam shape is arranged on the side. Then, the inner peripheral surface of the outer cylinder 12 is bonded to the outer peripheral side of the outer peripheral portion 16B of the elastic body 16,
These are connected.

Further, in order to facilitate the displacement of the inner cylindrical metal member 14 above the connecting portion 16A of the elastic body 16 in the vertical direction which is the main vibration direction of the vibration isolator 10, the horizontal direction in FIG. The hole 22 that is the longitudinal direction is formed so as to extend in the axial direction of the inner tubular metal member 14.

On the other hand, a lower portion of the connecting portion 16A of the elastic body 16 is a concave portion 16C forming a concave space, and a portion of the outer cylinder 12 near the center lower side is lower than the lower surface of the outer cylinder 12. An opening 12A linearly extending toward the recess 16C of the elastic body 16 with a constant diameter is formed.

In the opening 12A, the standing wall portion 2 is formed in a cylindrical shape so that its cross section is formed in an inverted U shape.
The partition wall member 28 having 8A and a flange portion 28B which is formed on the lower end portion so as to spread toward the outer peripheral side is arranged so that the flange portion 28B abuts against the wall surface of the opening 12A. ing. Further, the partition member 28
The upper part of the partition wall 28 contacts the lower part of the elastic body 16, and the partition member 28 is positioned in the opening 12A.

A diaphragm 36, which is made of a rubber material and is deformable, is provided below the partition member 28 with an opening 12A.
The diaphragm 38 is a cover member 38 which is arranged so as to seal the inner wall of the opening 12A and is tightly fitted to the wall surface of the opening 12A by the cylindrical portion 38A formed in a cylindrical shape.
It is placed underneath.

Therefore, the flange portion 28B of the partition member 28
Also, the partition member 28 and the diaphragm 36 are fixed in the opening 12A of the outer cylinder 12 by the lid member 38 arranged in the opening 12A while contacting them with the cylinder 38A so as to push the outer peripheral portion of the diaphragm 36. Has been done.

A liquid such as water or oil is enclosed in the space between the recess 16C of the elastic body 16 and the diaphragm 36, and the partition member 28 divides this space into the pressure receiving liquid chamber 24 and the sub liquid chamber. 26 is divided into two parts, and the diaphragm 36 serves as a wall part that allows the sub liquid chamber 26 to expand and contract. Further, an air chamber 40 is provided between the diaphragm 36 and the lid member 38, so that the diaphragm 36 can be deformed.

As described above, a space is formed between the wall surface of the opening 12A and the standing wall portion 28A of the partition member 28 over the outer circumference of the partition member 28, and this space constitutes the orifice 30 serving as a restricted passage.

Further, the standing wall portion 28A of the partition member 28
1, the auxiliary liquid chamber 26 and the orifice 3 are provided on the right side.
A small hole 32 that communicates with the inside of 0 is formed, and the elastic body 1
A groove 34 that connects the pressure receiving liquid chamber 24 and the inside of the orifice 30 is formed in the upper left lower portion of FIG. Therefore, the orifice 30 serves as the pressure receiving liquid chamber 24 and the auxiliary liquid chamber 26.
It will be connected so as to communicate with.

Next, the assembly of the vibration isolator 10 according to this embodiment will be described. At the time of assembling the vibration isolator 10, the elastic body 16 having a ring-shaped outer peripheral portion 16B and a connecting portion 16A extending from the periphery of the inner tubular metal fitting 14 to the outer tubular 12 side is provided around the inner tubular metal fitting 14. It is vulcanized and bonded to obtain a state as shown in FIG.

Further, the inner cylindrical metal member 14 in which the elastic body 16 is vulcanized and bonded is inserted into a molding die (not shown) together with the elastic body 16, and a resin is provided between the outer peripheral side of the elastic body 16 and the molding die. By injecting the material, the resin outer cylinder 12 as shown in FIG. 4 is integrally injection-molded.

Then, in the liquid, in the opening 12A, as shown in FIG.
After inserting the partition member 28, the diaphragm 36, and the like shown in (3), the lid member 38 is fitted into the opening 12A, and the outer peripheral portions of the partition member 28 and the diaphragm 36 are fixed by the lid member 38. As a result, the lower portion of the sub liquid chamber 26 is reliably sealed by the diaphragm 36, and the liquid is sealed in the pressure receiving liquid chamber 24 and the sub liquid chamber 26.

Further, the vibration isolator 1 completed in this way
Screw the outer cylinder 12 of 0 to the car body side to connect it,
Further, the inner tubular metal piece 14 is connected to the engine via a bolt.

Next, the operation of the present embodiment will be described. When the vibration of the engine is transmitted to the inner tubular member 14, the elastic body 16
The connecting portion 16A is deformed, and accordingly, the pressure receiving liquid chamber 24
Expands and contracts, and the pressure receiving liquid chamber 24 passes through the orifice 30.
The diaphragm 36, which is the wall portion of the sub liquid chamber 26 connected to, is deformed. As a result, the liquid in the orifice 30 undergoes a pressure change, a viscous resistance, etc., and the vibration is damped not only by the deformation of the elastic body 16 but also by the pressure change of the liquid, so that the vibration is generated on the vehicle body side connected to the outer cylinder 12. It becomes difficult to be transmitted.

On the other hand, when the vibration isolator 10 is assembled, the outer cylinder 12 is integrally molded with a resin material, so that the vibration isolator 1
The weight of the outer cylinder 12 can be reduced, and the outer cylinder 12 does not need to be processed by pressing or the like, and the processing steps of the vibration isolator 10 can be simplified. Therefore, the number of parts and processing man-hours are reduced,
It has become possible to reduce the manufacturing cost of the vibration isolation device 10.

Further, the partition member 28 is inserted into the opening 12A of the outer cylinder 12 to isolate the pressure receiving liquid chamber 24 and the sub liquid chamber 26 from each other, and the space between the pressure receiving liquid chamber 24 and the sub liquid chamber 26. The connecting orifice 30 is formed by the space between the wall surface of the opening 12A of the outer cylinder 12 and the standing wall portion 28A of the partition member 28.

Therefore, since the orifice 30 is not arranged on the outer peripheral side of the elastic body 16, the sealing metal fittings and the reinforcing metal fittings as in the prior art are not required, and the number of parts is reduced. It is not necessary to incorporate these metal fittings into the manufacturing and vibration isolating device 10, the assembling property is improved, and the manufacturing cost of the vibration isolating device 10 is reduced.

On the other hand, a diaphragm 36 which can deform a part of the wall of the sub liquid chamber 26 so that the sub liquid chamber 26 can be expanded and contracted.
The diaphragm member 36 is inserted into the opening 12A of the outer cylinder 12 and the diaphragm 36 is fixed in the opening 12A of the outer cylinder 12. Therefore, the partition member 28 and the diaphragm 36 are formed in the opening 12A of the outer cylinder 12. It will be fixed securely in 12A.

Along with this, the auxiliary liquid chamber 26 is provided radially outward of the inner tubular member 14 with respect to the pressure receiving liquid chamber 24 and adjacent to the pressure receiving liquid chamber 24 while being separated by the thin partition member 28. The vibration damping device 10 can be downsized.

In the above embodiment, the outer cylinder 12 is connected to the vehicle body side which is the vibration receiving portion, and the inner cylinder metal fitting 14 is connected to the engine side which is the vibration generating portion. May be configured.

Further, although the inner cylinder is made of metal fittings in the above-mentioned embodiment, it may be made of resin, and the kind of resin material used in the above-mentioned embodiment is AB.
S, polyacetal and the like are conceivable, but not limited thereto.

On the other hand, the partition member and the lid member can be formed of a thin steel plate, but can also be formed of another metal such as aluminum or another kind of material such as resin.

On the other hand, in the embodiments, the purpose of the present invention is to prevent the vibration of the engine mounted on the automobile. However, the anti-vibration device of the present invention can be used, for example, in the body mount of the automobile or in other applications other than the automobile. Needless to say
Further, the shapes and dimensions of the elastic body, the partition member, etc. are not limited to those in the embodiment.

[0043]

As described above, the vibration isolator of the present invention has an excellent effect that the manufacturing cost is reduced by reducing the number of parts and improving the assembling property.

[Brief description of drawings]

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

FIG. 2 is a perspective view showing a vibration isolation device according to an embodiment of the present invention.

FIG. 3 is a cross-sectional view showing an inner cylindrical metal member and an elastic body of the vibration control device according to the embodiment of the present invention.

FIG. 4 is an exploded cross-sectional view of a vibration damping device according to an embodiment of the present invention.

[Explanation of symbols]

 10 Vibration Isolator 12 Outer Cylinder 14 Inner Cylinder Metal Fitting (Inner Cylinder) 16 Elastic Body 24 Pressure-Receiving Liquid Chamber 26 Sub-Liquid Chamber 28 Partition Member 30 Orifice 38 Lid (Sealing Plate)

Claims (2)

[Claims] 1. An outer cylinder connected to one of the vibration generating part and the vibration receiving part and integrally formed of resin while having an opening at at least one end, and connected to the other of the vibration generating part and the vibration receiving part. An inner cylinder disposed inside the outer cylinder, and an elastic body disposed between the outer cylinder and the inner cylinder so as to connect between the outer cylinder and the inner cylinder; A pressure receiving liquid chamber at least a part of which is formed of the elastic body and in which a liquid is sealed, a sub liquid chamber which is formed separately from the pressure receiving liquid chamber and is expandable and contractible, and is inserted into the opening of the outer cylinder. A partition wall member for partitioning the pressure receiving liquid chamber and the sub liquid chamber, and a space formed between the wall surface of the opening portion of the outer cylinder and the partition member, the pressure receiving liquid chamber and the sub liquid chamber An anti-vibration device comprising: a restricted passage that connects the two. 2. A diaphragm which is capable of deforming a part of a wall portion of the auxiliary liquid chamber so that the auxiliary liquid chamber can be expanded and contracted, and a sealing plate is inserted into the opening of the outer cylinder to form the diaphragm. The anti-vibration device according to claim 1, characterized in that.