JPH07167200A - Vibration control device - Google Patents

Abstract

PURPOSE:To effectively prevent leakage of liquid from the inside by positively discharging liquid in a gap while forming a grooven a connection portion. CONSTITUTION:A groove 21 is formed on a flange 18B of a bottom plate fitting 18. A support outer cylinder which has a flange 14A is arranged on an upper portion of the bottom plate fitting 18. The flange 14A is caulked in respect to the flange 18B to fix the support outer cylinder 14 to the bottom plate fitting 18. An outer peripheral surface of an elastic body 16 is cured and fixed to the support outer cylinder 14, while an inner peripheral surface of the elastic body 16 is cured and fixed to a top plate fitting 12. Liquid is sealed in a liquid chamber 26 made up of a diaphragm 22, the top plate fitting 12 and the inner peripheral surface of the elastic body 16. In assembling, liquid is also sealed into a gap S between the support outer cylinder 14 and the bottom plate fitting 18, but is discharged through the groove 21.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration isolator applied to prevent transmission of vibrations from a vibration generator,
For example, it can be applied to an engine mount for preventing transmission of engine vibration to the vehicle body, other vehicles, general industrial machines, and the like.

[0002]

2. Description of the Related Art For example, a vehicle is provided with an anti-vibration device as an engine mount between an engine which is a vibration generating part and a vehicle body which is a vibration receiving part. The vibration device absorbs the vibration and prevents the vibration from being transmitted to the vehicle body.

That is, as this anti-vibration device, a device is known in which a liquid chamber containing a pair of liquids is provided inside the main body of the anti-vibration device, and these liquid chambers are communicated with each other through a restriction passage serving as an orifice. There is. Then, when the mounted engine operates to generate vibration, a damping force is generated by viscous resistance of the liquid in the orifice that communicates these liquid chambers, the vibration is absorbed, and the transmission of the vibration is blocked. (Japanese Patent Laid-Open No. 61-189341).

[0004]

In order to prevent the deterioration of the anti-vibration characteristics, the anti-vibration device as described above is joined by caulking the metal parts constituting the anti-vibration device in a liquid when assembling the anti-vibration device. By doing so, the liquid is filled in the liquid chamber in a state where it overflows so as to prevent air from entering the liquid chamber.

On the other hand, considering the ease of assembly, it is necessary to have a large dimensional tolerance of the components constituting the anti-vibration device. However, due to this dimensional tolerance, a slight gap portion is generated between the components, and the gap portion is left in the gap portion during assembly. Will also collect liquid.

Therefore, the liquid is left in the originally unnecessary gap portion, and the liquid sometimes leaks from the gap portion at the time of shipping the vibration isolator or assembling the vibration isolator into the vehicle.

For this reason, even if the liquid chamber does not originally have a problem in the sealing property, the liquid that has accumulated in the gap portion leaks out through the joint portion, and the liquid leaks due to a poor sealing of the liquid chamber. There was a risk that it would be judged to be present.

In view of the above facts, the present invention provides a vibration damping device capable of effectively preventing liquid from leaking from the inside by forming a groove in a joint portion and positively discharging the liquid. With the goal.

[0009]

A vibration isolator according to the present invention comprises a first mounting member connected to one of a vibration generating section and a vibration receiving section, and a first mounting member connected to the other of the vibration generating section and the vibration receiving section. A second mounting member that is formed by joining a pair of members and has a groove for leading out a liquid at this joint portion, and is interposed between the first mounting member and the second mounting member. It is characterized by having an elastic body to be attached and a liquid chamber in which at least a part of the inner wall is formed by the elastic body and a liquid is sealed.

[0010]

The elastic body is interposed between the first mounting member and the second mounting member, and the inner wall of which at least a part is formed by any of these members forms a liquid chamber in which the liquid is sealed. Has been formed. Therefore, when the vibration is transmitted from the vibration generating portion side connected to any one of the mounting members, the elastic body is deformed and a pressure change occurs in the liquid in the liquid chamber, and the vibration is damped by the elastic body and the liquid, Vibration is less likely to be transmitted to the vibration receiving portion side.

Further, since the second mounting member is formed by joining a pair of members and a groove for leading out the liquid accumulated in the gap between the pair of members is provided in this joining portion, it is positive. The liquid accumulated in the gap can be discharged.

Therefore, for example, when the antivibration device is shipped or when the antivibration device is installed in the vehicle, the liquid does not seep out from the gap portion, and the liquid can be effectively prevented from leaking from the inside. .

As a result, even if there is no problem in the sealing property of the liquid chamber, it is judged that the liquid is leaking due to the poor sealing of the liquid chamber due to the liquid leaking through the joint portion. Is gone.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, 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 based on these drawings.

As shown in FIGS. 1 and 2 showing the cross-sectional view of this embodiment, the center of a top plate metal fitting 12 made of a steel plate which is the first mounting member forming the upper side of this so-called vertical vibration isolator 10. A bolt 13 used for connecting the engine (not shown) projects upward from the portion.

On the other hand, a bolt 20 for connecting and fixing the anti-vibration device 10 to a vehicle body (not shown) protrudes from the central lower part of the bottom plate metal fitting 18 made of a steel plate forming the lower side of the anti-vibration device 10. . Around the bottom plate fitting 18 is a cylindrical standing wall 18A, and a flange portion 18B projects outward from the upper end of the standing wall 18A.

As shown in FIG. 3, a plurality of (21 in this embodiment) grooves 21 are radially formed around the bolt 20 in the flange portion 18B.

Further, a support outer cylinder 14 made of a steel plate having a disk-shaped flange portion 14A on the lower side is arranged on the upper portion of the bottom plate fitting 18 in FIG. This flange part 1
The outer peripheral end of 4A is caulked with the flange portion 18B of the bottom plate fitting 18 to fix the support outer cylinder 14 and the bottom plate fitting 18 to each other. Further, a cylinder portion 14B is provided upright from the inner peripheral portion of the flange portion 14A, and a support cylinder portion 14C that spreads in a taper shape is continuously formed at the upper end portion of the cylinder portion 14B.

The outer peripheral surface of a rubber elastic body 16 having a cylindrical shape is vulcanized and adhered to the inner peripheral surface of the support outer cylinder 14 from the support cylindrical portion 14C to the flange portion 14A. The inner peripheral surface is vulcanized and adhered to the top plate fitting 12.

As described above, the pair of bottom plate fittings 18 and the supporting outer cylinder 14 constitute a second mounting member to which the elastic body 16 is mounted, and the flange portion 14A of the supporting outer cylinder 14 and the bottom plate. The flange portion 18B of the metal fitting 18 serves as a joint portion.

The top plate fitting 12, the supporting outer cylinder 14, the elastic body 16 and the bottom plate fitting 18 constitute a main part of the main body of the vibration isolator 10, and the top plate fitting 12 and the elastic body 16 therein, and the flange. A liquid chamber 26 formed by the inner wall surfaces of these members is provided between the portion 14A and the diaphragm 22 located between the flange portion 18B, and liquids such as water and oil are sealed therein. A partition plate 28 formed in a disk shape is arranged in the liquid chamber 26, and the liquid chamber 26 is divided into an upper liquid chamber 26A and a lower liquid chamber 26B which are a pair of liquid chambers. It is partitioned.

The partition plate 28 has a flat plate portion 28A formed in a flat plate shape in the central portion thereof, and the partition plate 28 has a support portion 28C for clamping on the outer peripheral side through a cylindrical portion 28B. It is formed one step lower. An orifice-constituting member 30 having a disc shape and having a step portion 30A on the outer periphery is fixed to the upper portion on the inner peripheral side of the partition plate 28 by means of welding or the like. An orifice 31, which is a ring-shaped space, is formed between and.

Further, a closing plate (not shown) is provided at a part of the orifice 31, and a small hole 32 that connects the upper liquid chamber 26A and the inside of the orifice 31 is formed on one side of the closing plate. On the other hand, a small hole 34 that connects the lower liquid chamber 26B and the inside of the orifice 31 is formed. Therefore, the orifice 31 and the small holes 32, 34 are
6A and the lower liquid chamber 26B are communicated with each other.

The partition plate 28 and the orifice-constituting member 30 can be manufactured by pressing a steel plate, but can also be manufactured by integrally molding a synthetic resin, a metal such as aluminum, or the like.

On the other hand, the support portion 28C of the partition plate 28 protruding outward is brought into contact with the bottom surface of the flange portion 14A through the elastic body 16 and supported together with the outer peripheral portion of the diaphragm 22 with the flange portion 18B of the bottom plate fitting 18. The partition plate 28 and the diaphragm 22 are fixed by being sandwiched between the outer cylinder 14 and the flange portion 14A. Further, an air chamber 36 is provided between the diaphragm 22 and the bottom plate fitting 18 to allow the diaphragm 22 to be deformed.

Further, at the time of assembly, the partition plate 28 and the orifice-constituting member 30 are fixed to each other, and then the elastic body 16 is vulcanized and bonded between the partition plate 28 and the top plate fitting 12 in the supporting outer cylinder 14. To insert. Then, the supporting outer cylinder 14 and the bottom plate fitting 18 are caulked and fixed while sandwiching the support portion 28C of the partition plate 28 and the outer peripheral portion of the diaphragm 22 in the tank storing the liquid, and the liquid chamber 26 The assembly is completed with the liquid sealed inside.

At this time, the liquid is filled in the gap S caused by the dimensional tolerance between the supporting outer cylinder 14 and the bottom plate fitting 18, but the groove 21 provided in the bottom plate fitting 18 causes the liquid to flow from the gap S. The liquid is drained.

Next, the operation of this embodiment will be described. When the engine mounted on the top plate metal member 12 operates, the vibration of the engine is transmitted to the elastic body 16 via the top plate metal member 12. The elastic body 16 acts mainly as a vibration absorber, and can absorb the vibration by the vibration damping function based on the internal friction of the elastic body 16. Furthermore, the liquid in the upper liquid chamber 26A and the liquid in the lower liquid chamber 26B mutually flow through the orifice 31, and the damping effect based on the viscous resistance of the liquid flow generated in the orifice 31 can improve the vibration damping effect.

Further, since the groove for leading out the liquid sandwiched in the gap S is provided at the joining portion by the caulking process, the liquid accumulated in the gap S can be positively discharged, and the liquid can be quickly discharged. The liquid in the gap S disappears. Therefore, for example, at the time of shipment of the vibration isolation device 10 or the vibration isolation device 10
The liquid does not seep out from the gap S when the vehicle is installed in the vehicle.

As a result, it is possible to prevent the liquid from leaking from the joining portion joined by the caulking process, and to prevent the liquid from leaking erroneously due to the poor sealing of the liquid chamber 26.

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

As shown in FIG. 4, in the first embodiment, the bottom plate fitting 18 is simply provided with the groove 21, but in the present embodiment, the chamfer is formed on the outer peripheral side of the flange portion 18B corresponding to the groove 21. The linear part 42 which is a part was formed.

For example, when the groove 21 is formed by pressing or the like, the outer peripheral portion of the flange portion 18B around the groove 21 is plastically deformed and protrudes. The straight portion 42 can absorb the protrusion due to plastic deformation. it can.

In the above embodiment, the groove 21 is provided in the bottom plate fitting 18, but instead of this, the supporting outer cylinder 1 is provided.
4 may be provided with a groove, and the joint portion is caulked and fixed, but it is also possible to use a joining means such as adhesion or a bolt.

Further, the engine is connected to the top plate metal fitting 12 side serving as the first mounting member, and the vehicle body is connected to the bottom plate metal fitting 18 side serving as the second mounting member. Good. Although rubber is used as the material for the elastic body 16 and the diaphragm 22, other known elastic materials may be used.

On the other hand, although the purpose of the present invention is to prevent the vibration of the engine mounted on the vehicle, it goes without saying that the vibration control device of the present invention can be used for other purposes. The shape and the like are not limited to those of the embodiment.

[0037]

As a result of having the structure described above, the vibration isolator of the present invention prevents the liquid from leaking from the inside by forming a groove in the joint portion and positively discharging the liquid. The excellent effect that it can be effectively prevented occurs.

[Brief description of drawings]

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

FIG. 2 is an enlarged cross-sectional view of a main part of the vibration control device according to the first embodiment of the present invention.

FIG. 3 is a view showing a bottom plate fitting of the vibration isolator according to the first embodiment of the present invention, in which (a) is a plan view and (b) is a front view.

FIG. 4 is a view showing a bottom plate fitting of a vibration isolator according to a second embodiment of the present invention, in which (a) is a plan view and (b) is a front view.

[Explanation of symbols]

 10 Vibration Isolator 12 Top Plate Metal Fitting (First Mounting Member) 14 Support Outer Cylinder (Second Mounting Member) 16 Elastic Body 18 Bottom Plate Metal Fitting (Second Mounting Member) 21 Groove 26 Liquid Chamber

Claims (1)

[Claims] 1. A first mounting member connected to one of the vibration generating portion and the vibration receiving portion, and a liquid connected to the other of the vibration generating portion and the vibration receiving portion and formed by joining a pair of members. A second mounting member having a groove for leading out to the joint, an elastic body mounted by being interposed between the first mounting member and the second mounting member, and at least a part of the inner wall. A vibration chamber formed of the elastic body and having a liquid sealed therein.