JPH06341483A - Vibration control device - Google Patents

Abstract

PURPOSE:To omit such troublesome processes as to check airtightness and to apply a sealant by making a structure to completely seal an air cell. CONSTITUTION:Between a top plate 18 and a support cylinder 14 connected to a bottom plate 10, a rubber 16 is installed. In these top plate 18, bottom plate 10, support cylinder 14 and others, liquid chambers 26, 27 are formed, and the pressure liquid chamber 26 and the auxiliary liquid chamber 27 are partitioned by a bulkhead material 28. The upper part of the bottom plate 10 is covered by an airtight plate 40 formed to match the shape of the bottom plate 10. Consequently, it is a structure where an air cell 35 is provided between a diaphragm 22 to be a bulkhead of the auxiliary liquid chamber 27 and the airtight plate 40 formed along the bottom plate 10. Consequently, as the airtight plate 40 is arranged on the upper part of the bottom plate 10, air is never leaked from the air cell 35.

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 an engine mounted on a vehicle, and more particularly to mounts for supporting members that generate vibration. It is applicable.

[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 vibration isolator, only an elastic body which is elastically deformed inside, a pressure receiving liquid chamber whose volume is changed by the deformation of the elastic body, and a sub liquid chamber which is communicated with a restriction passage serving as an orifice are provided. Instead, it is known that an auxiliary air chamber is provided with an air chamber which is sealed adjacently via a diaphragm.

When the mounted engine operates to generate vibration, the vibration is simply 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. Instead, the transmission of vibration is blocked by the resistance associated with the volume change in the closed air chamber.

[0005]

However, in the conventional vibration isolator, the mounting bolts for attaching the vibration isolator to the engine or the vehicle body and the pins for preventing the rotation when the vibration isolator is attached are provided in the air chamber. It is fixed by being caulked or welded to the wall surface forming the.

Therefore, it has been difficult to increase airtightness by leaking air from minute holes formed in the mounting portions of these mounting bolts and pins. Therefore, put the anti-vibration device in the water so that the air chamber is completely sealed.
The process of checking the airtightness of the mounting parts of the mounting bolts and pins and applying a sealant around these parts was added.

In consideration of the above facts, it is an object of the present invention to provide a vibration isolator having a structure for completely sealing an air chamber, which eliminates the troublesome steps of checking the airtightness and applying a sealant. And

[0008]

A vibration isolator according to the present invention comprises a first mounting member connected to one of a vibration generating portion and a vibration receiving portion, and an elastic body mounted to the first mounting member. A pressure receiving liquid chamber in which at least a part of the inner wall is formed of the elastic body and in which a liquid is sealed, and a sub liquid chamber which is connected to the pressure receiving liquid chamber through an orifice and has a partition wall formed of a diaphragm. A second mounting member that is connected to the other of the vibration generating portion and the vibration receiving portion by a connecting portion and forms an air chamber with the diaphragm; and the second mounting member that is arranged as a wall portion of the air chamber. And an airtight member that covers the connecting portion of the member.

[0009]

An elastic body is interposed between the first mounting member and the second mounting member, and a pressure receiving liquid chamber in which a liquid is sealed is formed by an inner wall at least a part of which is formed by the elastic body. ing. Then, a part of the partition wall of the sub liquid chamber, which is communicated with the pressure receiving liquid chamber via the orifice, is formed of a diaphragm, and the second mounting member connected to the other of the vibration generating portion and the vibration receiving portion by the connecting portion, An air chamber is formed between the diaphragm and the diaphragm. Further, an airtight member is arranged as a wall portion that directly partitions the air chamber, and covers the connecting portion of the second mounting member.

Therefore, when the vibration is transmitted from the vibration generating portion connected to any one of the mounting members, the elastic body is deformed, and the pressure receiving liquid chamber is expanded / contracted accordingly, and the pressure of the liquid in the orifice changes. Occurs. Further, the liquid flows from the pressure receiving liquid chamber into the sub liquid chamber, deforms the diaphragm to change the volume of the sub liquid chamber, and changes the volume of the air chamber located between the sub liquid chamber and the diaphragm.

As described above, the vibration is attenuated by the deformation of the elastic body, the pressure change of the liquid, and the pressure change caused by the volume change of the air chamber, and it becomes difficult to transmit the vibration to the vibration receiving portion side.

Further, since the airtight member arranged as the wall portion of the air chamber covers the connecting portion of the second mounting member, leakage of air from the air chamber can be prevented.

[0013]

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 FIG. 1 showing the present embodiment, a bottom plate 1 which is a mounting member forming the lower side of the vibration isolator 100.
In the center of 0, the vibration isolation device 100 is attached to the vehicle body (not shown).
A mounting bolt 12, which is a connecting portion for connecting and fixing by screwing a nut (not shown), penetrates and projects from the upper side. Further, a rotation stop pin 37, which is also a connecting portion, is press-fitted into the bottom plate 10 so that the vibration damping device 100 does not rotate with respect to the vehicle body. And the bottom plate 1
Around the 0, a flange plate 10B is formed via a cylindrical standing wall 10A.

On the upper side of the bottom plate 10, there is provided an airtight plate 40 which is formed in a disc shape in conformity with the shape of the bottom plate 10 by a galvanized steel plate having a plate thickness of 0.3 mm to 2.0 mm and which is resistant to rust. It is located and covers the upper part of the bottom plate 10. And
As shown in FIG. 1, a relief portion 41 having a shape escaping to the upper side in advance is formed in a portion of the airtight plate 40 facing the head portion 12A of the mounting bolt 12 and facing the upper portion of the rotation stop pin 37. And the standing wall 10A of the airtight plate 40
As shown in FIGS. 2 and 3, the cylindrical portion 40 </ b> A, which has a cylindrical shape opposite to the above, is formed with a protrusion 42 protruding to the outer peripheral side for facilitating the press-fitting of the airtight plate 40 into the bottom plate 10. There is.

On the other hand, the support cylinder 14 is attached to the upper portion of the flange plate 10B via the flange plate 40B of the airtight plate 40 and the diaphragm 22. The outer peripheral end of a disc-shaped flange portion 14A of the support cylinder 14 is caulked and fixed to the flange plate 10B.

Therefore, due to the fixation between the bottom plate 10 and the support cylinder 14, the air chamber 3 is provided between the diaphragm 22 and the airtight plate 40 which is an airtight member formed along the bottom plate 10.
5, the air chamber 35 allows the diaphragm 22 to be deformed. Therefore, mounting bolt 1
Even if the bottom plate 10 has minute holes generated in the mounting portion of the rotation stopper pin 37 and the rotation stop pin 37, since the airtight plate 40 is arranged above the bottom plate 10, air does not leak from the air chamber 35, and Airtightness in the chamber 35 is improved.

A tubular portion 14B is erected at a right angle from the inner peripheral portion of the flange portion 14A, and a support tubular portion 14C extending in a tapered shape is continuous from the upper end portion of the tubular portion 14B.

The outer peripheral surface of a rubber 16 which is a cylindrical elastic body is vulcanized and adhered to the inner peripheral surface of the support cylindrical portion 14C, and the inner peripheral surface of the rubber 16 is formed in a U-shaped cross section. The connecting plate 50 is vulcanized and adhered, and a flange portion 50A projects from the upper part of the connecting plate 50 to the outer peripheral side over the entire circumference. Then, the top plate 18 serving as a mounting member located above the connecting plate 50 is welded to the flange portion 50A, and the top plate 18 is fixed to the upper portion of the connecting plate 50.
Therefore, the rubber 16 is attached so as to be interposed between the top plate 18 and the bottom plate 10. Furthermore, this top plate 18
The mounting bolt 20 projecting from the central portion of is used for connecting to the engine, and the engine is fixed by screwing a nut (not shown).

On the other hand, the diaphragm 22, which is caulked and fixed to the flange portion 14A together with the flange plate 10B, and the rubber 1
Liquid chambers 26 and 27 formed by the inner wall surfaces of these members are provided between them and 6, and liquids such as water and oil are sealed therein. A partition material 28 made of an insulating material such as ceramics is provided in the liquid chambers 26 and 27.
Is arranged, and the liquid chamber is divided into a pressure receiving liquid chamber 26 and a sub liquid chamber 27.

Further, inside the outer peripheral end portion 28C which is the outer peripheral surface of the partition wall member 28, an orifice 29 which is a passage is formed along the outer peripheral end portion 28C for almost one round. The partition member 28 can be integrally formed by using a material such as ceramics.

A small hole 32 is formed at one end of the orifice 29 to connect the pressure receiving liquid chamber 26 with the inside of the orifice 29, and the other end is connected with the sub liquid chamber 27 and the inside of the orifice 29. A small hole 34 is formed. Therefore, the orifice 29 and the small holes 32, 34 connect the pressure receiving liquid chamber 26 and the sub liquid chamber 27.

The lower portion of the outer peripheral end portion 28C projects outwardly, is brought into contact with the bottom surface of the flange portion 14A, and
Flange plate 10B, flange plate 40B, diaphragm 2
Along with 2, it is caulked and fixed to the flange portion 14A.

Further, at the time of assembly, the partition wall material 28 is inserted into the support cylinder 14, and the flange portion 14A of the support cylinder 14 is
The flange plate 10B of the bottom plate 10, the flange plate 40B of the airtight plate 40, and the outer peripheral side of the diaphragm 22 are bent, respectively, and the partition plate material 28 is caulked and fixed together with the bottom plate 10, the airtight plate 40, and the diaphragm 22 to the support cylinder 14. If the assembly is completed. However, if necessary, it is possible to use an attachment means such as an adhesive or a bolt for attaching the partition wall material 28.

Next, the operation of this embodiment will be described. Top plate 18
When the engine mounted on the vehicle operates, the vibration of the engine is transmitted to the rubber 16 via the top plate 18 and the connecting plate 50. The rubber 16 acts mainly as a vibration absorber, and can absorb the vibration by a vibration damping function based on internal friction when the rubber 16 is deformed.

Further, the pressure receiving liquid chamber 2 is accompanied by the deformation of the rubber 16.
6 expands and contracts, a pressure change occurs in the liquid in the orifice 29, and a viscous resistance of the liquid flow occurs. Further, the liquid flows from the pressure receiving liquid chamber 26 into the sub liquid chamber 27, deforms the diaphragm 22 to change the volume of the sub liquid chamber 27, and also changes the volume of the air chamber 35 positioned with the diaphragm 22 sandwiched therebetween.

As described above, the vibration is attenuated by the deformation of the rubber 16, the pressure change of the liquid, the pressure change due to the volume change of the air chamber 35, etc., and it becomes difficult to transmit the vibration to the vehicle body side.

Further, since the airtight plate 40 arranged as the wall portion of the air chamber 35 covers the mounting bolt 12 and the rotation stop pin 37 of the bottom plate 10, the leakage of air from the inside of the air chamber 35 is prevented.

Therefore, the step of checking the airtightness of the mounting portion of the mounting bolt 12 and the rotation preventing pin 37 for preventing air leakage and applying the sealant is omitted.

Further, the air chamber 3 is provided by providing an escape portion 41.
Since the airtight plate 40 covering the mounting bolt 12 and the rotation stop pin 37 while maximizing the inner volume of 5 is provided, even if the diaphragm 22 is deformed, the mounting bolt 12 and the rotation stop pin 37 are directly connected to each other. Since they do not come into contact with each other, the durability of the diaphragm 22 is improved.

Since the airtight plate 40 is formed of a galvanized steel plate, it is possible to prevent air leakage due to rust of the airtight plate 40 and deterioration of the durability of the diaphragm 22.

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 with reference to these drawings. 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 showing the present embodiment, the bottom plate 1
No. 0 flange plate 10B is formed to have a diameter slightly smaller than that of the first embodiment, and the flange plate 40B of the airtight plate 40 protruding from the flange plate 10B is bent upward in advance as shown in FIG. At the time of caulking between the support cylinder 14 and the support cylinder 14, the interval defining portion 44 is defined to define the height dimension H inside the caulking portion.

Therefore, the bottom plate 1 is formed by the space defining portion 44.
When 0 and the support cylinder 14 are fixed to each other, they are crimped more uniformly, and the airtightness of the air chamber 35 is further improved.

Although the airtight plate 40 is made of a galvanized steel plate in the embodiment, it may be made of other metal such as stainless steel, or the airtight plate 40 made of a synthetic resin material. Further, although the bottom plate 10 side serving as the second mounting member is connected to the vehicle body and the top plate 18 side serving as the first mounting member is connected to the engine, the configuration may be reversed.

On the other hand, although the purpose of the present invention is to prevent the vibration of the engine mounted on the vehicle, the anti-vibration device of the present invention may be used, for example, in a body mount of a vehicle or in other applications other than the vehicle. Needless to say, the shape and size of the elastic material and the number of orifices 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 has a structure that completely seals the air chamber, and therefore has a troublesome process of checking the airtightness and applying a sealant. It has the excellent effect of being omitted.

[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 cross-sectional view of an airtight plate used in the first embodiment of the vibration isolator according to the present invention before assembly.

FIG. 3 is a bottom view of the airtight plate used in the first embodiment of the vibration isolator according to the present invention before assembly.

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

FIG. 5 is a cross-sectional view of an airtight plate used in a second embodiment of the vibration isolator according to the present invention before assembly.

[Explanation of symbols]

 10 Bottom Plate (Second Mounting Member) 12 Mounting Bolt (Connecting Part) 14 Support Cylinder 16 Rubber (Elastic Body) 18 Top Plate (First Mounting Member) 22 Diaphragm 26 Pressure Receiving Liquid Chamber 27 Sub Liquid Chamber 29 Orifice 35 Air Chamber 37 Non-rotating pin (connecting part) 40 Airtight plate (airtight member) 100 Anti-vibration device

Claims (1)

[Claims] 1. A first mounting member connected to one of a vibration generating portion and a vibration receiving portion, an elastic body mounted to the first mounting member, and at least a part of an inner wall formed by the elastic body. Further, the pressure receiving liquid chamber in which the liquid is sealed is connected to the pressure receiving liquid chamber through the orifice and the sub liquid chamber having a part of the partition wall composed of the diaphragm, and the other of the vibration generating part and the vibration receiving part. A second attachment member that is connected to the diaphragm and forms an air chamber with the diaphragm, and an airtight member that is arranged as a wall of the air chamber and covers the connection portion of the second attachment member. Anti-vibration device characterized by.