JPH08247208A - Vibration isolator - Google Patents

Abstract

PURPOSE: To improve the assembly of a vibration isolator, and to reduce the manufacturing cost. CONSTITUTION: The upper center of an elastic body 18 is vulcanization adhered to a top plate 12 and a connection cylinder 20, and a recessed part 18A is formed in the lower center of the elastic body 18. A supporting cylinder 16 made of synthetic resin material is arranged on the outer circumferential side of the elastic body 18 so as to surround the elastic body 18. A liquid chamber 32 is provided between a diaphragm 30 and the recessed part 18A of the elastic body 18. An opening part 46 is formed by the inner circumferential surface of a large cylindrical part 16B of the supporting cylinder 16. A partitioning member 34 is inserted into the liquid chamber 32 from the opening part 46. The partitioning member 34 and the diaphragm 30 are integratedly fixed with each other by a cap 28. Vulcanization adhesion of the rubber material to the supporting cylinder 16 is dispensed with by subsequently forming the supporting cylinder 16 around the elastic body 18.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration isolator for preventing the transmission of vibrations from a vibration generator, and is applied to mounts such as automobiles, construction machines and general industrial machines that support members that generate vibrations. It is possible.

[0002]

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

That is, as this anti-vibration device, there is known one in which an elastic body and a pair of liquid chambers are provided inside the anti-vibration device, and these liquid chambers are communicated with each other by a restriction passage serving as an orifice. Then, when the mounted engine operates to generate vibration, the vibration is absorbed by the vibration damping function of the elastic body and the viscous resistance of the liquid in the orifice that connects these liquid chambers to transmit the vibration. It is supposed to block.

As one example thereof, a vibration isolation device as shown in FIG. 6 is known, which will be described below.

As shown in this figure, a rubber elastic body 118 is vulcanized and bonded between the support fitting 114 and the upper fitting 116 where the lower fitting 112 of the vibration isolator is caulked. Has been placed.

Then, the lower mounting bracket 112 and the supporting bracket 1
A diaphragm 122 whose outer peripheral portion is sandwiched between 14 and
A liquid chamber 124 is provided between the elastic body 118 and the elastic body 118. Further, the liquid chamber 124 is replaced with a pair of liquid chambers 124A and 124B.
And a partition member 130 having an orifice 132 for communicating between the liquid chambers 124A and 124B.
It has a structure installed in the liquid chamber 124.

Further, a stopper member 136 made of metal is attached to the support metal fitting 114 in order to restrict excessive displacement of the upper mounting metal fitting 116 in the upward and leftward directions.

When manufacturing the vibration isolator as described above,
First, a support frame 114 and a top mounting bracket 116, which are metal frames, are vulcanized and adhered to an elastic body 118, and a container-like structure is turned upside down to inject a liquid. Further, the partition member 130 having the orifice 132 and the diaphragm 122 are set in the liquid chamber 124, and the lower mounting bracket 112 is covered from above to seal the liquid chamber 124.

[0009]

However, in manufacturing the conventional vibration isolator as described above, there were the following drawbacks.

First, it is necessary to vulcanize and bond a rubber material to be the elastic body 118 to the support fitting 114, but if the rubber material is vulcanized and adhered to the support fitting 114, which is a large frame made of metal, it will take about a unit time. The quantity that can be vulcanized decreases and the processing cost increases. In addition, the support metal 11
Since the protrusion of the rubber material from 4 occurs, a finishing step for removing the protruding portion is required, which further increases the processing cost and consequently the manufacturing cost.

Further, a displacement regulating stopper member 136 is provided.
When assembling, the number of parts increases, the number of steps for assembling increases, the assembly work becomes complicated, and the manufacturing cost further increases.

In view of the above facts, an object of the present invention is to provide an anti-vibration device capable of improving the assembling property and reducing the manufacturing cost.

[0013]

According to a first aspect of the present invention, there is provided a vibration isolator comprising: a first mounting member connected to one of a vibration generating portion and a vibration receiving portion; and an elastic body connected to the first mounting member. A second mounting member made of resin, which is connected to the other of the vibration generating unit and the vibration receiving unit and is arranged so as to surround the elastic body and is connected to the elastic body, and at least a part of the inner wall is A liquid chamber made of an elastic body and having an opening at one end side, a partition member inserted into the liquid chamber through the opening so as to divide the liquid chamber into two parts, and covering the opening. It has a diaphragm which constitutes a part of inner wall of the liquid chamber, and a sealing member which closes the opening and seals the liquid chamber in a state where the liquid is sealed.

A vibration isolator according to a second aspect is the vibration isolator according to the first aspect, characterized in that a stopper member for restricting displacement of the first attachment member is integrally formed with the second attachment member. To do.

[0015]

The operation of the vibration isolator according to claim 1 will be described below.

At least a part of the inner wall of the liquid chamber is formed by the elastic body connected to the first mounting member, and the second wall made of resin is used.
Is attached to the elastic body while being disposed so as to surround the elastic body. Furthermore, since the sealing member closes the opening of the liquid chamber to seal the liquid chamber in the state where the liquid is sealed,
A liquid chamber in which the liquid is sealed is formed.

Therefore, when vibration is transmitted to the vibration isolator thus formed from the side of the vibration generator connected to any one of the mounting members, the elastic body is deformed, and the liquid chamber is accordingly deformed. When the liquid expands and contracts, a pressure change and a flow occur in the liquid, the vibration is attenuated by the deformation of the elastic body and the pressure change and the flow of the liquid, and the vibration is difficult to be transmitted to the vibration receiving portion side.

In manufacturing the vibration isolator according to the first aspect, for example, the elastic body is first vulcanized and adhered only to the first mounting member, and the elastic body is adhered to the second mounting member. Adhesive treatment is applied to the necessary areas for this. After that, the elastic body and the first mounting member are loaded into the resin mold, and the molten resin material is injection-molded to mold the second mounting member while being bonded and connected to the elastic body.

Then, a partitioning member is inserted into the liquid chamber from the opening so as to divide the liquid chamber into two parts, and the diaphragm covers the opening of the liquid chamber, and the sealing member closes the opening of the liquid chamber.

As described above, since it is not necessary to vulcanize and adhere the rubber material to the second mounting member, the number of vulcanizable units per unit time is increased and the processing cost is reduced.
Along with this, since the rubber material does not protrude from the second mounting member during vulcanization, a finishing step for removing the protruding portion is unnecessary, and the processing cost is further reduced.

As a result, the processing cost associated with the vulcanization of the rubber material can be significantly reduced, and the manufacturing cost of the vibration isolator can be reduced.

The operation of the vibration isolator according to claim 2 will be described below. The vibration isolator according to the present claim has the same effect as the vibration isolator of claim 1, but since the stopper member for restricting the displacement of the first mounting member is formed integrally with the second mounting member, It also acts like.

That is, since the stopper member for displacement regulation can also be integrally molded with resin, the number of parts does not increase, and the number of man-hours for assembling does not increase, and assembling work does not become complicated. As a result, the assembling property is improved and the manufacturing cost is further reduced.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a vibration isolator according to the present invention is shown in FIGS. 1 to 3, and this embodiment will be described with reference to these drawings.

As shown in FIGS. 1 and 2 showing this embodiment, a nut (not shown) is provided on an engine (not shown) above the top plate 12 forming the upper side of the vibration isolator 10. Bolt for connecting and fixing by screwing
4 is protruding. A cylindrical connecting tube 20 is joined to the lower portion of the top plate 12 by welding or the like, and the top plate 12 and the connecting tube 20 form a first mounting member.

A cylindrical elastic body 18 made of rubber is vulcanized and adhered to the top plate 12 and the connecting cylinder 20, and a concave portion 18A is formed in the lower center of the elastic body 18.
Are formed.

On the outer peripheral side of the elastic body 18, a support cylinder 16 which is a second mounting member made of a synthetic resin material and formed in a tubular shape is arranged so as to surround the elastic body 18.

The lower portion of the support cylinder 16 is composed of a flange portion 16A protruding outward, and a pair of collars 22 are embedded in the flange portion 16A.
Therefore, bolts (not shown) projecting from the vehicle body side are respectively passed through these collars 22, and nuts (not shown) are also fastened to the bolts,
The support cylinder 16 is connected to the vehicle body side.

A large cylindrical portion 16B having a cylindrical shape is erected at a right angle from the inner peripheral portion of the flange portion 16A.
A tubular small tubular portion 16D having a smaller diameter than the large tubular portion 16B is connected to an upper portion of B via a step portion 16C. Further, the outer peripheral surface of the elastic body 18 is adhered to the inner peripheral surface of the support cylinder 16 from the small cylinder portion 16D to the step portion 16C, and the support cylinder 16 is connected to the elastic body 18 by adhesion. ing.

On the other hand, between the rubber diaphragm 30 whose outer peripheral portion is in contact with the step portion 16C through the lower portion of the elastic body 18 and the recess 18A of the elastic body 18, these members are provided inside. A liquid chamber 32 having a wall surface is provided, and a liquid such as water or oil is enclosed therein. Therefore, the opening formed by the inner peripheral surface of the large cylindrical portion 16B on the lower side of the step portion 16C in FIG. 1 becomes the opening portion 46 formed on the one end side of the liquid chamber 32.

A partition member 34 made of, for example, a synthetic resin material is disposed in the liquid chamber 32 so as to be fitted into the recess 18A of the elastic body 18, and the liquid chamber 32 is referred to as the main liquid chamber 32A. The sub-liquid chamber 32B is divided into two parts.

The lower end portion of the outer peripheral end portion 34A, which is the outer peripheral surface of the partition member 34, projects outward, and this portion is in contact with the step portion 16C of the support cylinder 16 via the elastic body 18. That is, the partition member 34 and the diaphragm 30 are integrally fixed while being pressed against the step portion 16C by the cap 28 that is a sealing member.

The cap 28 is formed into a disc shape and has a ring-shaped fitting portion 28A at the outer peripheral end.
The fitting portion 28 is provided on the inner peripheral surface of the large tubular portion 16B.
A cap 28 is arranged inside the support cylinder 16 while A is tightly fitted.

As a result, since the opening 28 of the liquid chamber 32 is closed to seal the liquid chamber 32 with the cap 28 sealing the liquid, the liquid is sealed in the liquid chamber 32 as described above. become.

Further, the diaphragm 30 and the cap 28
An air chamber 44 is provided between and to allow the deformation of the diaphragm 30.

On the other hand, inside the outer peripheral end portion 34A of the partition member 34, there is provided a groove portion 36 formed in a groove shape along the outer peripheral end portion 34A for almost one round. This groove 36
A small hole 38 that connects the main liquid chamber 32A and the inside of the groove 36 is formed at one end of the, and a small hole 40 that connects the sub liquid chamber 32B and the inside of the groove 36 is formed at the other end. There is. Therefore, the groove portion 36 and the small holes 38, 40 closed by the inner wall surface of the elastic body 18 constitute an orifice 42 that connects the main liquid chamber 32A and the sub liquid chamber 32B.

Next, the assembly of the vibration isolator 10 of this embodiment will be described. First, in a state in which the top plate 12 and the connecting cylinder 20 are welded and connected to each other, they are put in a mold for vulcanization to vulcanize the elastic body 18, and the elastic body 18 is vulcanized and adhered to the top plate 12 and the connecting cylinder 20. To do.

Further, a bonding process is applied to a portion required for bonding the elastic body 18 to the supporting cylinder 16. After that, the elastic body 18 and the top plate 12 are placed in a mold for resin molding.
3, the collar 22 is loaded, and the molten resin material is injection-molded to mold the support cylinder 16 in a state of being bonded and connected to the elastic body 18, as shown in FIG.

In the liquid, a partition member 34 that divides the liquid chamber 32 into two is inserted into the liquid chamber 32 through the opening 46, and further, by the diaphragm 30 that constitutes a part of the inner wall of the liquid chamber 32. The opening 46 of the liquid chamber 32 is covered, and finally, the fitting portion 28A of the cap 28 is attached to the large tubular portion 16
By fitting into B, the opening portion 46 of the liquid chamber 32 is closed by the cap 28, and the state shown in FIG. 1 is obtained.

Thereafter, the vibration isolator 10 thus assembled is installed in the vehicle. Next, the operation of this embodiment will be described.

When the engine mounted on the top plate 12 is operated, the vibration of the engine is transmitted to the elastic body 18 via the top plate 12 and the connecting cylinder 20. The elastic body 18 acts as a vibration absorbing body, and can absorb the vibration by the vibration damping function based on the internal friction accompanying the deformation of the elastic body 18. further,
Due to the deformation of the elastic body 18, the main liquid chamber 32A expands and contracts, the diaphragm 30 on the side of the sub liquid chamber 32B deforms, and the liquids in the main liquid chamber 32A and the sub liquid chamber 32B flow through each other through the orifices 42. The vibration damping effect can be improved by the damping action based on the pressure change of the liquid generated in the orifice space and the viscous resistance of the liquid flow.

On the other hand, since the vibration isolator 10 of this embodiment is assembled as described above, the supporting cylinder 1 which becomes the frame body
Since it is not necessary to vulcanize and bond the rubber material to No. 6, the number of vulcanizable units per unit time increases, and the processing cost is reduced. That is, the vulcanization molding process of the rubber material is the most troublesome and time consuming of all the steps of manufacturing the vibration isolator 10, and requires a large processing cost. Therefore, the vulcanization molding process should be facilitated. Then, the manufacturing of the vibration isolator 10 is dramatically facilitated.

Along with this, the supporting cylinder 1 during vulcanization
Since the protrusion of the rubber material from 6 is eliminated, a finishing step for removing the protruding portion is unnecessary, and the processing cost is further reduced.

As a result, the processing cost associated with the vulcanization of the rubber material can be significantly reduced, and the manufacturing cost of the vibration isolator 10 can be reduced.

Next, a second embodiment of the vibration isolator according to the present invention is shown in FIGS. 4 and 5, and this embodiment will be described based on these drawings. The same members as those described in the first embodiment are designated by the same reference numerals, and duplicated description will be omitted.

As shown in FIGS. 4 and 5, in the vibration isolator 10 of this embodiment, instead of the top plate 12 and the connecting cylinder 20, a metal pipe member 52, which is a first mounting member, is used as the elastic body 18.
It is connected while being vulcanized and adhered. Both ends of the pipe material 52 penetrate the elastic body 18 and project from the elastic body 18, and a bolt (not shown) for connecting to the engine is inserted so that the pipe material 52 is connected to the engine. It has become.

Further, on the upper part of the support cylinder 16, a stopper member 16E for covering the portion of the elastic body 18 projecting above the support cylinder 16 from above is arranged integrally with the support cylinder 16 in an arc shape. ing. For this reason, this stopper member 16E prevents the pipe material 5 from moving upward in FIG. 4 and FIG.
2 and the excessive displacement of the pipe member 52 in the X direction (shown in FIG. 4) are regulated.

Next, the assembly of this embodiment will be described. In assembling the vibration isolator 10, first, the pipe material 52 is put into a mold for vulcanization, the elastic body 18 is vulcanized, and the elastic body 18 is vulcanized and bonded to the pipe material 52.

Further, a bonding process is applied to a portion required for bonding the elastic body 18 to the supporting cylinder 16. After that, the elastic body 18, the pipe member 52, and the collar 22 are loaded in a resin molding mold, and the molten resin material is injection-molded, and the support cylinder 16 is bonded to the elastic body 18 and connected. Mold with. At this time, the stopper member 16E is also integrally formed with the support cylinder 16.

Thereafter, as in the first embodiment, the partition member 34, the diaphragm 30 and the cap 2 are placed in the liquid.
8 is attached and the assembly of the vibration isolator 10 is completed.

Next, the operation of this embodiment will be described. Similar to the first embodiment, this embodiment can also improve the vibration damping effect by the damping function based on the internal friction of the elastic body 18 and the damping action based on the viscous resistance of the liquid flow.

Further, the displacement regulating stopper member 16E
Since it can be integrally molded with the support cylinder 16 with resin, the number of parts does not increase, and the number of steps for assembling does not increase the complexity of assembly work. As a result, the cost of parts is reduced and the assemblability is improved. It will be improved and the manufacturing cost will be further reduced.

Incidentally, when the adhesive treatment is applied to a portion required for the adhesion between the elastic body 18 and the support cylinder 16, the following adhesive treatment may be considered. However, it is not limited to these.

For example, as shown in Japanese Examined Patent Publication No. 62-58301, the surface of the elastic body 18 is treated with a dilute solution of trichloroisocyanuric acid, and a polyamide resin heated and melted in a mold is injected to support the support cylinder 16. The means to Further, as disclosed in Japanese Patent Application Laid-Open No. 2-84310, the surface of the elastic body 18 is chlorinated, and the chlorinated surface is mainly composed of a mixture of a resol-type phenol resin and an aldehyde-modified product of polyvinyl alcohol. Means for forming a vulcanized adhesive layer may be considered.

On the other hand, as the type of resin used for the support cylinder 16, not only polyamide resin but also resin materials such as polyacetal, polycarbonate and polyimide are conceivable, but not limited to these materials.

Further, in the above-described embodiment, the engine, which is the vibration generating portion, is connected to the top plate 12 and the connecting cylinder 20, which are the first mounting members, or the pipe member 52 side, and is used as a vibration receiving portion of a vehicle such as an automobile. Although the supporting cylinder 16 side serving as the second mounting member is connected to the vehicle body, the structure may be reversed.

On the other hand, although the purpose of the present invention is to prevent the vibration of the engine mounted in the vehicle, the vibration control device of the present invention may be used for other purposes such as a vehicle body mount or the like. Needless to say, the shape, size, etc. are not limited to those of the embodiment.

[0058]

As a result of having the structure described above, the vibration isolator of the present invention can improve the assemblability and reduce the manufacturing cost.

[Brief description of drawings]

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

FIG. 2 is a plan view showing a first embodiment of a vibration isolator according to the present invention.

FIG. 3 is a cross-sectional view illustrating the assembly of the first embodiment of the vibration damping device according to the present invention.

FIG. 4 is a sectional view showing a second embodiment of the vibration isolator according to the present invention.

FIG. 5 is a side view showing a second embodiment of the vibration isolator according to the present invention.

FIG. 6 is a cross-sectional view showing a vibration isolator according to a conventional technique.

[Explanation of symbols]

 10 Vibration Isolator 12 Top Plate (First Mounting Member) 16 Support Cylinder (Second Mounting Member) 16E Stopper Member 18 Elastic Body 20 Connecting Cylinder (First Mounting Member) 28 Cap (Sealing Member) 30 Diaphragm 32 Liquid Chamber 34 Partition member 46 Opening 52 Pipe material (first mounting member)

Claims (2)

[Claims] 1. A first mounting member connected to one of the vibration generating portion and the vibration receiving portion, an elastic body connected to the first mounting member, and a connection to the other of the vibration generating portion and the vibration receiving portion. A second mounting member made of resin, which is arranged so as to surround the elastic body and is connected to the elastic body, and at least a part of an inner wall of which is formed of the elastic body and which has an opening on one end side. A liquid chamber, a partition member that is inserted into the liquid chamber through the opening so as to divide the liquid chamber into two parts, and a diaphragm that covers the opening and forms a part of an inner wall of the liquid chamber. And a sealing member that seals the liquid chamber by closing the opening in a state in which a liquid is sealed. 2. A vibration isolator according to claim 1, wherein a stopper member for restricting displacement of the first mounting member is integrally formed with the second mounting member.