JP2002122176A - Vibration isolator method of manufacturing vibration isolator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve assembling while securing sealing performance. SOLUTION: On the inner side of an outer cylinder metal fitting 12, an inner cylinder metal fitting 16 is disposed, and these are connected to each other by an elastic body 14. At an engagement part 16A of the outer cylinder metal fitting 16, an inner circumferential surface of a seal rubber 14A extended from a body part of the elastic body 14, and formed thin is tapered. A partition wall member 34 having end parts of mutually different sizes corresponding to the form of the tapered seal rubber 14A is engaged with an inner wall surface of the seal rubber 14A of the elastic body 14.

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 prevent transmission of vibration from a vibration generating section, and a method of manufacturing such an anti-vibration device. And can be applied to mounts that support members such as an engine that generate vibration.

[0002]

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

As one example, the following vibration isolator is known. In other words, between the outer cylinder fitting and the inner fitting,
A rubber elastic body is disposed, and a partition member that partitions a liquid chamber provided between the diaphragm and the elastic body disposed in the outer cylinder into a pair of liquid chambers is provided in the liquid chamber. The vibration isolator has a structure as described in, for example, JP-A-6-129478. Therefore, when vibration is generated by the operation of the mounted engine, the vibration is absorbed by the vibration damping function of the elastic body and the viscous resistance of the liquid flowing between the two liquid chambers, and the transmission of the vibration is prevented. It is supposed to.

On the other hand, when such a conventional vibration isolator is manufactured, the partition member is inserted into the outer cylindrical member in order to seal the entire space between the partition member and the outer cylindrical member in the circumferential direction. Later, the sealing rubber is drawn together with the outer cylinder, or the partition member is entirely pressed into the outer cylinder.

[0005]

However, when the sealing rubber is drawn together with the outer cylinder, the assembling process of the vibration isolator becomes complicated and the assemblability is reduced, and the outer cylinder is deformed. Therefore, there is a possibility that the seal rubber may be peeled off from the outer tube fitting, and the sealing property may be reduced.
On the other hand, when the partition member is slid over a long distance as a whole and press-fitted into the outer cylinder fitting, the possibility of damaging the seal rubber with the press-fit increases, and it is conceivable that the sealing property also deteriorates. Was. The present invention has been made in view of the above circumstances, and has as its object to provide an anti-vibration device and a method of manufacturing the anti-vibration device, which can improve assemblability while ensuring sealing performance.

[0006]

According to a first aspect of the present invention, there is provided a vibration isolator connected to one of a vibration generator and a vibration receiver, and a first support member connected to the other of the vibration generator and the vibration receiver. A second support member, an elastic body disposed between the support members and connecting the support members so as to be elastically deformable, a liquid chamber in which a liquid is sealed with the elastic body as a part of a wall surface, The seal rubber, which is attached to the support member and has an inner peripheral surface formed in a tapered shape so that the open end side of the second support member is wider than the back side, and the size of both ends corresponding to the shape of the seal rubber are mutually different. And a partition member which is different from the second support member via a seal rubber and is fixed while partitioning the liquid chamber.

The operation of the vibration isolator according to claim 1 will be described below. When vibration is transmitted from the vibration generating section connected to any of the support members, the elastic body disposed between the two support members is elastically deformed and the vibration is attenuated by the elastic body. As a result, when the vibration is transmitted from the vibration generating unit side, the vibration is reduced by the deformation of the elastic body, and the vibration is hardly transmitted to the vibration receiving unit side.

Further, a partition member partitions the liquid chamber in which the liquid is sealed with the elastic body as a part of the wall surface, and the liquid flows between the partitioned liquid chambers to further vibrate due to the viscous resistance of the liquid. Is reduced. On the other hand, the inner peripheral surface of the seal rubber attached to the second support member is formed in a tapered shape so that the open end side of the second support member is wider than the back side, and both end portions corresponding to the shape of the seal rubber. Partition members having different sizes are fitted and fixed to the second support member via the seal rubber.

Therefore, in the vibration damping device according to the present invention, the partition member can be inserted without contacting the seal rubber to a certain extent, and thereafter, only a small distance is pressed into the partition member to provide a sufficient space between the partition member and the seal rubber. Not only is it possible to obtain a sealing margin, but also the seal rubber is less likely to be damaged as the press-fitting distance is short, so that sufficient sealing performance can be ensured. Further, since the drawing process of the seal rubber is not employed, the assemblability of the vibration isolator is improved.

The operation of the vibration isolator according to claim 2 will be described below. The present invention has a configuration similar to that of the first aspect and performs the same operation. However, according to the present invention, a distal flange portion and a proximal flange portion are formed at both end portions of the partition member so as to expand outward, respectively, and the outer diameter of the distal flange portion is outside the proximal flange portion. The partition member is disposed in the seal rubber such that the partition member is formed to be smaller than the diameter and is sealed over the entire periphery of both ends of the partition member while a passage is formed between the seal rubber and the partition member. I have.

Therefore, flange portions are provided at both ends of the partition member, and the outer diameter of the distal flange portion is formed smaller than the outer diameter of the proximal flange portion in accordance with the inner peripheral surface of the tapered seal rubber. Therefore, not only the sealing property can be ensured, but also the passage is formed between the seal rubber and the partition member, and the passage allows the liquid to flow between the liquid chambers defined by the partition member. .

The operation of the vibration isolator according to claim 3 will be described below. The present invention has the same configuration as that of the first and second aspects and performs the same operation. However, in this claim, the second
Of the support member is formed straight, and the inner peripheral surface is formed in a tapered shape by changing the thickness of the seal rubber. Therefore, by simply changing the thickness of the seal rubber, it is not necessary to form the portion of the second support member that fits with the partition member into a tapered shape, and the manufacture of the second support member is simplified, and the vibration isolator is simplified. Manufacturing cost is reduced.

According to a fourth aspect of the present invention, there is provided a method of manufacturing a vibration isolator, wherein a first support member and a second support member are manufactured, and
When forming an elastic body that elastically deforms the connection between the support member and the second support member, the seal rubber is arranged on the second support member while the inner peripheral surface is formed in a tapered shape. The partition member is formed so that the size of both ends is different from each other corresponding to the shape of the seal rubber, and then the partition member is pressed into the second support member, and the space therebetween is sealed via the seal rubber. It is characterized by stopping.

The operation of the method for manufacturing a vibration isolator according to claim 4 will be described below. When forming an elastic body that elastically deforms the first support member and the second support member, a seal rubber having an inner peripheral surface formed in a tapered shape is disposed on the second support member. The partition member is formed so that the size of both ends is different from each other in accordance with the shape of the inner peripheral surface of the tapered seal rubber. Then, the partition member is pressed into the second support member, and the space therebetween is sealed via a seal rubber.

Therefore, in the method of manufacturing a vibration isolator according to the present invention, a sufficient sealing margin can be obtained between the partition wall member and the seal rubber only by press-fitting a small distance as in the first embodiment. In addition, as the press-fitting distance is short, the seal rubber is less likely to be damaged and the sealing property can be sufficiently ensured. Further, since the drawing process of the seal rubber is not employed, the assemblability of the vibration isolator is improved.

The operation of the method for manufacturing a vibration isolator according to claims 5 and 6 will be described below. These claims have a configuration similar to that of claim 4 and have the same effect. However, in claim 5, when the partition member is formed, the distal flange portion and the proximal flange portion are formed at both ends of the partition member so as to expand outward, and the outer diameter of the distal flange portion is based on the outer diameter. Since it is configured to be smaller than the outer diameter of the end-side flange portion, it operates in the same manner as in claim 2. According to a sixth aspect of the present invention, when manufacturing the second support member, a portion of the second support member that fits with the partition member is formed straight, and when the seal rubber is disposed on the second support member,
Since the inner peripheral surface of the seal rubber is formed in a tapered shape by changing the thickness of the seal rubber,
It works in the same way as the third aspect.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 to 3 show an embodiment of a vibration isolator and a method for manufacturing the vibration isolator according to the present invention, and the present embodiment will be described with reference to these drawings. As shown in FIG. 1 showing the present embodiment, an outer cylindrical metal part 16 having a cylindrical portion on the outer peripheral side of the vibration isolator 10 is configured. A lower part of the outer tube fitting 16 is provided with the outer tube fitting 16.
A bottom surface 16B serving as a lower surface of the bottom surface is provided, and a through hole 20 is formed in the center of the bottom surface 16B. A fitting portion 16A formed in a straight shape and having an outer diameter one step larger than that of the lower portion is provided in a portion near the upper side of the outer cylinder fitting 16.
The upper end of A has an open structure.

An outer peripheral surface of a rubber elastic body 14 formed in a cylindrical shape is vulcanized and adhered to an inner peripheral surface of the outer cylindrical bracket 16. The outer cylindrical bracket 16 surrounds the elastic body 14. It is in the form of holding. The portion of the elastic body 14 corresponding to the upper side of the outer tube fitting 16 including the fitting portion 16A is formed as a thin rubber seal 14A extending from the main body of the elastic body 14, and the seal rubber 14A is Fitting part 1
6A covers the entire inner peripheral surface.

The fitting portion 16 of the sealing rubber 14A
The seal rubber 14A also covers the outer peripheral side of the outer cylindrical member 16 through a hole 18 formed in the fitting portion 16A in order to increase the adhesive strength to A. In addition, by changing the thickness of the sealing rubber 14A with respect to the fitting portion 16A formed straight, the sealing rubber is tapered so that the open end side of the fitting portion 16A of the outer cylindrical member 16 is wider than the back side. An inner peripheral surface of 14A is formed.

Further, the elastic body 1 on the inner peripheral side of the outer cylinder fitting 16 is provided.
A metal inner fitting 12 is partially embedded in the center of the base 4 while being vulcanized and adhered. A lower portion of the inner fitting 12 projects downward from the elastic body 14 and passes through the above-described through hole 20. I have. The inner metal fitting 12 is provided with a screw hole 12B in which a female screw is formed. This inner fitting 1
A contact fitting 22 whose outer peripheral side is embedded in the elastic body 14 is disposed at a position directly above the second fitting 2 while being in contact with the inner fitting 12.

As described above, the inner fitting 12 protruding from the elastic body 14 is used for connection to an engine (not shown), and the inner fitting 12 is connected to the engine via an arm (not shown) screwed into the screw hole 12B. It will be connected to the engine that will be the vibration generator. Further, the outer cylinder fitting 16 is connected to a vehicle body serving as a vibration receiving portion by fitting the outer cylinder fitting 16 to a vehicle body (not shown), and the vibration isolator 10 is fixed to the vehicle body. For this reason, the inner metal fitting 12 is used as a first support member connected to the vibration generating unit, and the outer cylindrical metal fitting 1 is provided.
6 is a second support member connected to the vibration receiving portion.

On the other hand, a sealing member 24 formed in a ring shape is fitted and arranged on the inner peripheral portion on the upper side of the outer cylindrical member 16, and the outer peripheral end is vulcanized and bonded to the sealing member 24. A rubber diaphragm 30 is arranged on the upper side portion of the outer tube fitting 16. A liquid chamber 32 having an inner wall formed by these members is provided between the diaphragm 30 and the elastic body 14, and a liquid such as water or oil is sealed therein. In the liquid chamber 32,
For example, a partition wall member 34 made of a synthetic resin material and formed into a cylindrical shape with a bottom is fitted on the inner wall surface of the seal rubber 14A of the elastic body 14, and the lower end portion is engaged with the fitting portion 16A to position in the axial direction. The liquid chamber 32 is divided into two parts, a pressure receiving liquid chamber 32A, which is a pair of small liquid chambers, and a balancing chamber 32B.

The partition member 34 has mutually different sizes at both ends corresponding to the shape of the tapered seal rubber 14A. That is, the distal end flange portions 3 formed at both ends of the partition wall member 34 so as to expand outward.
4A and the proximal flange portion 34B, but the outer diameter of the distal flange portion 34A is smaller than the proximal flange portion 34B.
The outer diameter of the front flange 3
The surface connected by 4A and the base side flange part 34B is tapered like a truncated cone.

On the outer periphery of the partition member 34, there is provided a groove 34C formed in a groove along substantially the entire circumference along the outer periphery of the partition member 34. At one end of the groove 34C, a communication port 42 for communicating the pressure receiving liquid chamber 32A and the inside of the groove 34C is formed, and at the other end, a communication port 44 for communicating the equilibrium chamber 32B and the inside of the groove 34C is formed. Have been.

Therefore, by disposing the partition member 34 in the seal rubber 14A so as to be sealed over the entire outer periphery of both ends of the partition member 34, the groove 34C closed by the inner wall surface of the seal rubber 14A is formed. , Seal rubber 14A
A passage 36 is formed between the pressure receiving liquid chamber 32A and the equilibrium chamber 32B. The passage 36 is formed between the pressure receiving liquid chamber 32A and the equilibrium chamber 32B.

A circular recess 38 is formed at the center of the partition member 34. A through hole 40 through which the liquid can flow through the partition member 34 is formed in the recess 38.
Is provided. A disk-shaped holding member 26 is disposed below the partition member 34. The holding member 26 is made of rubber so as to close a hole 26A formed at the center of the holding member 26. The outer peripheral portion of the membrane 48 as the elastic plate is vulcanized and bonded.

Next, a procedure for manufacturing the vibration isolator 10 according to the present embodiment will be described. First, the inner fitting 12 and the outer sleeve 16 are manufactured. When the outer sleeve 16 is manufactured, the fitting portion 16A of the outer sleeve 16 is formed in a straight cylindrical shape. After that, the inner metal fitting 12 and the outer cylindrical metal fitting 16 are put into a mold, and an elastic body 14 that connects them elastically deformable is formed by vulcanization and becomes a part of the elastic body 14. This seal rubber 1A is formed so that the inner peripheral surface of the seal rubber 14A is formed in a tapered shape.
4A is arranged at the fitting portion 16A of the outer tube fitting 16. That is, as shown in FIG.
A when attaching the seal rubber 14A to the seal rubber 14A.
By changing the thickness of A, the sealing rubber 1 is tapered.
4A is formed.

On the other hand, a partition member 34 is manufactured separately. At this time, a distal flange portion 34A and a proximal flange portion 34B are formed at both ends of the partition member 34 so as to extend outward. . However, the outer diameter of the distal flange portion 34A is formed smaller than the outer diameter of the proximal flange portion 34B. That is, as shown in FIG.
The partition member 34 is formed so as to have the same taper angle θ2 as the taper angle θ1 of the seal rubber 14A corresponding to the shape of the tapered seal rubber 14A so that the sizes of both ends are different from each other. Further, the outer diameters of these flange portions are slightly larger than the inner diameter of the seal rubber 14A, so that an appropriate sealing margin can be obtained.

Next, in the liquid, as shown in FIGS. 2A and 3A, together with the membrane 48, the partition member 34 is moved from the small-diameter distal flange portion 34A into the fitting portion 16A of the outer cylinder fitting 16. Insert Thereafter, the partition member 34 is further pushed in, and as shown in FIGS. 2B and 3B, the partition member 34 is pressed into the fitting portion 16A.
The space therebetween is sealed via the seal rubber 14A. Further, by press-fitting the sealing fitting 24 into the fitting portion 16A, the diaphragm 30 is housed in the outer tubular fitting 16, and the end of the fitting portion 16A is finally crimped.

As described above, not only are these members housed in the outer tube fitting 16, but also the space between the pair of liquid chambers 32A and 32B is sealed by the partition member 34, and the equilibrium chamber 32
B is sealed by a diaphragm 30 at the upper part of FIG.
The state is as shown in the figure. Thereafter, the vibration isolator 10 completed in this way is installed in the vehicle, and the outer cylinder fitting 16 is connected to the vehicle body, so that the vibration isolator 10 can be mounted on the vehicle body. Further, a bolt (not shown) is fastened to the screw hole 12B of the inner metal fitting 12, and the inner metal fitting 12 is connected to the engine, thereby completing the installation of the vibration isolator 10.

Next, the operation of the vibration isolator 10 and the method of manufacturing the vibration isolator according to the present embodiment will be described. A cylindrical outer bracket 16 is connected to the vehicle body.
The inner metal fitting 12 is positioned on the inner peripheral side of the inner metal part, and the other end of the inner metal fitting 12 is connected to the engine. Further, an elastic body 14 disposed between the inner metal fitting 12 and the outer cylindrical metal fitting 16 is provided.
Connect the inner metal fitting 12 and the outer cylindrical metal fitting 16 so as to be elastically deformable.

Accordingly, when the engine mounted on the inner fitting 12 operates, the vibration of the engine is transmitted to the elastic body 14 via the inner fitting 12. This elastic body 14 acts as a vibration absorbing main body, and can absorb vibration by a vibration damping function based on internal friction of the elastic body 14. Further, the liquid in the pressure receiving liquid chamber 32A and the liquid in the equilibrium chamber 32B mutually flow through the orifice 46, and the damping action based on the pressure change of the liquid generated in the orifice space, the viscous resistance of the liquid flow, etc. improves the vibration isolation effect. be able to.

On the other hand, the inner peripheral surface of the seal rubber 14A attached to the outer cylinder fitting 16 is formed in a tapered shape so that the open end side of the outer cylinder fitting 16 is wider than the back side, and corresponds to the shape of the seal rubber 14A. The partition members 34 having mutually different sizes at both ends are fitted and fixed to the outer tube fitting 16 via the seal rubber 14A.

Accordingly, the anti-vibration device 10 according to the present embodiment
Then, to some extent, the partition member 34 is sealed with the sealing rubber 14A.
The seal rubber 14A is not damaged by the short press-fitting distance, and the sealing performance is reduced. Can be secured sufficiently. Furthermore, since the drawing process of the seal rubber 14A is not used, the assemblability of the vibration isolator 10 is improved.

On the other hand, in the present embodiment, flange portions are provided at both ends of the partition member 34, and the outer diameter of the distal flange portion 34A is adjusted to the proximal side in accordance with the inner peripheral surface of the tapered seal rubber 14A. Since it is formed smaller than the outer diameter of the flange portion 34B, it is possible not only to ensure the sealing performance, but also to provide the passage 36 between the seal rubber 14A and the partition member 34.
Is formed, so that the liquid can flow between the liquid chambers 32A and 32B defined by the partition member 34 by the passage 36.

Further, in the present embodiment, the outer tube fitting 16
Of the partition member 34 is formed straight,
The inner peripheral surface is formed in a tapered shape by changing the thickness of the seal rubber 14A. Therefore, simply seal rubber 14A
By changing the thickness of the outer cylindrical member 16, it is not necessary to form a portion of the outer cylindrical member 16 to be fitted with the partition member 34 in a tapered shape, so that the manufacture of the outer cylindrical member 16 is simplified and
Manufacturing cost is reduced.

On the other hand, in the present embodiment, as in the case where high-frequency vibration is transmitted, the orifice 46 capable of only reducing the narrow frequency range is clogged and the orifice 46
Even when the vibration is not sufficiently reduced depending on the case alone, the membrane 48 does not elastically deform and the internal pressure in the liquid chamber 32 does not increase. As a result, even if a high frequency vibration that cannot be reduced by the orifice 46 is generated, the orifice 46 becomes a low dynamic spring, the vibration isolating characteristics are maintained without being reduced, and the effect of the vibration isolating device 10 is sufficiently exhibited.

In the above embodiment, the inner fitting 12 is connected to the engine, which is a vibration generating unit, and the outer tubular fitting 16 is connected to the vehicle body, which is a vibration receiving unit. It is good also as composition of. On the other hand, in the embodiments, the purpose is to dampen an engine mounted on a vehicle. However, it can be said that the damping device of the present invention is used for, for example, a body mount of a vehicle, or other uses other than the 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.

[0039]

As described above, the anti-vibration device and the method of manufacturing the anti-vibration device according to the present invention have the above-described configuration, and therefore, it is possible to improve the assemblability while securing the sealing performance and to reduce the manufacturing cost. Has the effect.

[Brief description of the drawings]

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

FIGS. 2A and 2B are diagrams illustrating assembly of the vibration damping device according to the embodiment of the present invention, in which FIG. 2A is a diagram illustrating a state in which a partition member is inserted into a fitting portion of an outer cylinder. (B) is a figure which shows the state which pushed in the partition member further and pressed in the fitting part of the outer cylinder fitting.

FIG. 3 is an enlarged view of a main part of FIG. 2, wherein FIG.
It is the figure which expanded the principal part of (A), and (B) is FIG. 2 (B).
It is the figure which expanded the principal part of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Vibration isolator 12 Inner fitting 14 Elastic body 14A Seal rubber 16 Outer cylinder fitting 16A Fitting part 32 Liquid chamber 32A Pressure receiving liquid chamber 32B Equilibrium chamber 34 Partition member 34A Front flange 34B Base flange

Claims (6)

[Claims] A first support member connected to one of the vibration generating section and the vibration receiving section; a second support member connected to the other of the vibration generating section and the vibration receiving section; An elastic body that is arranged and elastically deforms and connects the support members; a liquid chamber in which the elastic body is a part of a wall and in which a liquid is sealed; a liquid chamber attached to the second support member and opening of the second support member A seal rubber having an inner peripheral surface formed in a tapered shape so that an end side is wider than a back side; and two ends having different sizes corresponding to the shape of the seal rubber and being fitted to the second support member via the seal rubber. And a partition member fixed while partitioning the liquid chamber. 2. A method according to claim 1, wherein each of the partition members has a distal flange portion and a proximal flange portion which are formed so as to expand outward, respectively, and an outer diameter of the distal flange portion is equal to an outer diameter of the proximal flange portion. The partition member is disposed in the seal rubber such that the partition member is formed smaller and is sealed over the entire periphery of both ends of the partition member while a passage is formed between the seal rubber and the partition member. 2. The vibration isolator according to 1. 3. The tapered inner peripheral surface of the second support member, wherein a portion of the second support member to be fitted with the partition member is formed straight, and the thickness of the seal rubber is changed. The vibration isolator according to claim 2. 4. A method of manufacturing a first support member and a second support member, and forming an elastic body that elastically deforms the first support member and the second support member. The seal rubber is arranged on the second support member while the peripheral surface is formed in a tapered shape. In accordance with this, the partition member is formed so that the sizes of both ends are different from each other corresponding to the shape of the seal rubber. A method of manufacturing the vibration isolator, wherein the partition member is press-fitted into the second support member and the space therebetween is sealed via a seal rubber. 5. When the partition member is formed, a distal flange portion and a proximal flange portion are formed at both ends of the partition member so as to extend outward, respectively, and the outer diameter of the distal flange portion is set to be proximal. 5. The method according to claim 4, wherein the outer diameter of the side flange is smaller than an outer diameter of the side flange. 6. When the second support member is manufactured, a portion of the second support member that fits with the partition member is formed straight, and when the seal rubber is disposed on the second support member, the seal rubber is formed. The method according to claim 4 or 5, wherein the inner peripheral surface of the seal rubber is formed in a tapered shape by changing the thickness.