JPH07280034A - Vibration proof device - Google Patents

Abstract

PURPOSE:To effectively damp the vibration in an extensive range while the fitting reliability is improved. CONSTITUTION:A through hole 22 is formed in a supporting part 20A of a bracket 20 formed of the resin material, and a fitting piece 30 is arranged so as to pass through the through hole 22. The fitting piece 30 is provided with a tube part 32 which is concentrically arranged with the through hole 22 and flange parts 34, 36' which are respectively arranged at the upper and lower end parts of this tube part 32. Elastic bodies 38 which are elastically deformable are interposed between the through hole 22 and the tube part 32, and between the supporting part 20A and the flange parts 34, 36. In assembling a vibration proof device 10, the fitting piece 30 where the elastic bodies 38 are mounted is inserted in a mold, and the resin material is ejected around these components to form the bracket 20.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art Conventionally, it is known that an anti-vibration device as an engine mount is mounted between the body of an automobile and the engine.

An example of such a vibration isolation device is shown in FIG.
The conventional technique will be described with reference to this drawing.

As shown in FIG. 10, this type of vibration isolator 1
Reference numeral 10 denotes an inner cylinder 11 attached to the engine side of the automobile.
2 and an outer cylinder 114 attached to the vehicle body 126 side via a bracket 120 are connected by an elastic body 116 made of a rubber material or the like, and the inside and outside generated by the vibration transmitted from the engine. With the relative displacement between the cylinders 112 and 114 in the vertical direction in FIG.
When 16 is deformed, a damping force is generated to absorb the engine vibration, and the vibration is not transmitted to the vehicle body 126 side.

Further, in this type of vibration isolator 110, the outer cylinder 114 is press-fitted into a bracket 120 formed of a die cast aluminum material, a pressed steel material, an injection molded synthetic resin material or the like. The bracket 120 has a structure in which the bracket 120 is directly screwed and attached to the vehicle body 126 side.

Therefore, there is a possibility that vibrations in a high frequency band such as engine gear noise that cannot be sufficiently damped by the elastic body 116 may be transmitted to the vehicle body 126 side via the bracket 120.

Further, when the natural frequency of the bracket 120 among the vibrations in the high frequency band is transmitted,
The bracket 120 will resonate. As a result, in the vibration of such natural frequency, the vehicle body 126
Not only the vibration is transmitted to the side, but also the sound generated by the resonance of the bracket 120 itself is transmitted to the side of the vehicle body 126.

On the other hand, as shown in FIG. 10, the bracket 1
20 is fixed to the vehicle body 126 by screwing the bolts 124 to the vehicle body 126 side.
Is formed of a synthetic resin material, the axial force of the bolt 124 accompanying the screwing of the bolt 124, the bracket 120
Due to heat applied to the bracket 120 and vibration load applied to the bracket 120 from the engine side.
2 There was a risk that the bolt 124 would be deformed so as to be dented and the bolt 124 would be loosened. Therefore, the mounting reliability of the vibration isolator 110 on the vehicle body 126 side is reduced.

[0009]

SUMMARY OF THE INVENTION In consideration of the above facts, it is an object of the present invention to provide a vibration damping device which effectively damps a wide range of vibrations while improving the mounting reliability of the vibration damping device. Another object of the present invention is to provide the above vibration isolator while simplifying the manufacturing process.

[0010]

According to a first aspect of the present invention, there is provided a vibration damping device, which is connected to one of a vibration generating part and a vibration receiving part and is capable of attenuating an inputted vibration; A mounting member having a mounting hole for connecting to the other of the vibration generating section and the vibration receiving section, and installed so as to cover the inner peripheral surface and the periphery of the mounting hole and directly contact the other of the vibration generating section and the vibration receiving section. And a resilient body that is elastically deformable and is interposed between the mounting member and the mounting bracket.

According to a second aspect of the present invention, there is provided a vibration control device, which is connected to one of a vibration generating part and a vibration receiving part and is capable of attenuating the input vibration, and the device main body is attached and integrally made of a resin material. It has a mounting member that is molded and has a mounting hole for connecting to the other of the vibration generating portion and the vibration receiving portion, a pipe portion that covers the inner peripheral surface of the mounting hole, and a flange portion that covers the periphery of the mounting hole. And a mounting bracket installed so as to directly contact the other of the vibration generating part and the vibration receiving part,
Elastically deformable elastic bodies that are disposed so as to be respectively interposed between the attachment member and the pipe portion of the attachment fitting and between the attachment member and the flange portion of the attachment fitting. .

[0012]

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

A mounting member for fixing the main body of the apparatus, which is connected to one of the vibration generating section and the vibration receiving section, is provided with a mounting hole for connecting to the other of the vibration generating section and the vibration receiving section. In addition, a mounting bracket that covers the inner peripheral surface and the periphery of the mounting hole formed in the mounting member is installed so as to directly contact the other of the vibration generating portion and the vibration receiving portion, and the elastically deformable elastic body is mounted to the mounting member. It is arranged so as to be interposed between the metal fittings.

From the above, when the vibration is transmitted from the vibration generating side to the apparatus main body through the mounting member or directly,
The main body of the device attenuates the input vibration, making it difficult for the vibration to be transmitted to the vibration receiving portion side.

Further, when vibration of a frequency band that cannot be sufficiently damped by the main body of the apparatus is input, the vibration is also transmitted to the elastic body interposed between the mounting member and the mounting metal fitting. Will be attenuated by. Therefore, according to the vibration isolator of the present invention, it is possible to effectively damp a wide range of vibrations.

On the other hand, since the mounting member does not directly contact the other of the vibration generating portion and the vibration receiving portion, and the elastic body is interposed between the mounting metal member and the mounting member, the bolt is inserted into the mounting metal member. Even if they are fastened together, the axial force of the bolt accompanying the screwing of the bolt and the vibration load from the engine side will not be applied to the mounting member, so the mounting member will not deform and the mounting reliability of the anti-vibration device will be high. The property is improved.

The operation of the vibration isolator according to claim 2 will be described below. According to claim 2, in addition to having the same effect as in claim 1, the mounting bracket has a complicated shape such that it has a pipe portion that covers the inner peripheral surface of the mounting hole and a flange portion that covers the periphery of this mounting hole. Even if there is, the mounting member can be easily assembled to the mounting member by integrally molding the mounting member with the resin material, and the manufacturing process can be simplified.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A vibration isolator according to a first embodiment of 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 to 3, in the vibration isolator 10 of this embodiment, a bracket 20 which is integrally molded of synthetic resin, which is a resin material, and which constitutes a mounting member of the vibration isolator 10, Support part 20 that constitutes the lower part of the bracket 20
The bolt 24 is inserted into the through hole 22 which is a mounting hole formed in A and is screwed to the vehicle body 26 as a vibration receiving portion (shown in FIG. 3), thereby being attached to the vehicle body 26.

That is, as shown in FIGS. 1 and 2, four through holes 22 are formed in the support portion 20A of the bracket 20, and the through holes 22 are vertically penetrated and made of steel material. The formed mounting bracket 30 has these through holes 22.
Are located in each.

The fittings 30 are formed in a circular pipe shape and are arranged coaxially with the through hole 22, and a pair of flange portions 34 and 36 arranged at the upper and lower ends of the pipe portion 32, respectively. And a flange portion 34 on the upper side of the pair of flange portions 34, 36 is arranged on the upper surface side of the support portion 20A so as to cover the periphery of the through hole 22, and a flange portion on the lower side. Similarly, 36 is arranged on the lower surface side of the support portion 20A so as to cover the periphery of the through hole 22.

The space between the through hole 22 of the bracket 20 and the pipe portion 32 of the mounting member 30 that covers the through hole 22, and the supporting portion 20A of the bracket 20 and the mounting member 30.
An elastic body 38 having a U-shaped cross section and formed in a ring shape and made of a rubber material and elastically deformable is interposed between the pair of flange portions 34 and 36.

Further, as shown in FIG.
While the bolt 24 is inserted therein, the screw portion 24A of the bolt 24 is screwed into the screw hole 40 formed on the vehicle body 26 side, and the head portion 24B of the bolt 24 strongly contacts the flange portion 34. The mounting bracket 30 is pressed against the vehicle body 26 side, and the bracket 20 is fixed to the vehicle body 26 side. Therefore, the flange portion 36 of the mounting bracket 30 comes into contact with the vehicle body 26, and the lower surface side of the bracket 20 does not come into direct contact with the vehicle body 26 side.

On the other hand, as shown in FIGS. 1 and 2, a fitting portion 2 having a mounting hole 21 is formed in the upper portion of the bracket 20.
0B is configured, and the inner tubular metal fitting 14 formed in a circular pipe shape is arranged in the mounting hole 21 of the fitting portion 20B so as to be parallel to the axis of the mounting hole 21. Then, a bolt (not shown) is screwed into the inner tubular member 14 so that the inner tubular member 14 and the engine (not shown) serving as the vibration generating portion are connected.

On the other hand, between the inner tubular metal member 14 and the inner peripheral surface of the mounting hole 21, a rubber body 16 made of rubber and having a cylindrical shape is disposed. The outer peripheral portion of the main body rubber 16 is adhered to the inner peripheral surface of the mounting hole 21, and the central portion of the main body rubber 16 is vulcanized and adhered to the outer peripheral surface of the inner tubular metal piece 14.

Further, at the upper and lower positions of the main body rubber 16, in order to make it easier to displace the inner cylindrical metal member 14 in the vertical direction in FIG. 2 which is the main vibration direction of the vibration isolator 10, in FIG. Upper hole portion 16A and lower hole portion 16 whose direction is the longitudinal direction
B is formed so as to extend in the axial direction of the inner tubular member 14, respectively.

Next, the assembly of the vibration isolator 10 according to this embodiment will be described. When assembling the vibration isolator 10, the main body rubber 16 is vulcanized and adhered to the inner cylindrical metal fitting 14 in advance, the elastic body 38 is vulcanized and adhered to the mounting metal fitting 30, and further, the main body rubber is brought into contact with the resin material. 16 and the elastic body 38 are bonded. However, it is not necessary to bond between the mounting member 30 and the elastic body 38 and between the elastic body 38 and the bracket 20.

Thereafter, the inner tubular metal fitting 14 with the main body rubber 16 vulcanized and bonded and the mounting metal fitting 30 with the elastic body 38 vulcanized and bonded are inserted into the molding die to mount the bracket 20. The bracket 20 made of synthetic resin is injection-molded by injecting a resin material between the main body rubber 16 and the elastic body 38 and the inner wall surface of the molding die so as to be integrally molded. A mold having a general structure can be applied to this molding mold.

Further, the bracket 20 of the vibration isolator 10 thus completed by insert molding is connected to the vehicle body 26 side of the automobile, and the inner tubular metal piece 14 is connected to the engine via bolts.

Next, the operation of this embodiment will be described. When the engine vibration is transmitted to the inner tubular member 14, the main body rubber 16 is deformed and the vibration is attenuated, and the vibration transmitted to the vehicle body 26 connected to the bracket 20 side is reduced. In other words, vibration is transmitted from the engine side through the inner tubular metal fitting 14 to the main body rubber 1.
When transmitted to the vehicle body 6, the main body rubber 16 attenuates the input vibration and it becomes difficult to transmit the vibration to the vehicle body 26 side.

When vibration of a high frequency band including noise such as gear noise which cannot be sufficiently damped by the main body rubber 16 is input from the engine, an elastic body interposed between the bracket 20 and the mounting bracket 30. Since the vibration is also transmitted to 38, the vibration is damped by the elastic body 38. Therefore, according to the vibration isolator 10 of the present embodiment, it is possible to effectively damp a wide range of vibrations.

That is, in the vibration damping device 10 of this embodiment, the main body rubber 16 is arranged between the inner tubular metal member 14 and the bracket 20 so that the bracket 20 has the mass of the two-degree-of-freedom vibration system, and the bracket The elastic body 38 is arranged between the 20 and the mounting bracket 30. Therefore, 2
The heavy vibration-proof structure is adopted, and the dynamic spring constant of the main body rubber 16 increases in the high frequency band, which reduces the dynamic spring constant.
Vibration and noise are reduced so that they are not transmitted to the vehicle body 26 side.

Further, as a result of the vibration isolator of such a type, even if the rigidity of the bracket 20 is low, there is an advantage that noise such as gear noise becomes difficult to be transmitted. Then, by covering the inner peripheral surface and the periphery of the through hole 22 with the elastic body 38, it becomes possible to reduce the vibration in the horizontal direction and the oblique direction in addition to the vibration in the vertical direction in FIG.

On the other hand, as shown in FIG. 3, the bracket 20
Does not come into direct contact with the vehicle body 26 side, and since the elastic body 38 is interposed between the mounting bracket 30 and the bracket 20, even if the bolt 24 is inserted into the mounting bracket 30 and tightened, Since the axial force of the bolt 24 due to the screwing is not applied to the bracket 20, the bracket 20 is not deformed, and the mounting reliability of the vibration isolator 10 is improved. Then, along with this, since the tightening force of the bolt 24 is not directly applied to the elastic body 38,
The deformable material of the elastic body 38 is secured, and the function of the elastic body 38 as an elastic material is sufficiently exhibited.

Further, as shown in FIG. 2 and FIG. 3, the mounting metal fitting 30 covers the inner peripheral surface of the through hole 22 and the flange portion 34 covering the supporting portion 20A around the through hole 22,
Even if it has a complicated shape such as having 36, it is possible to easily assemble the mounting bracket 30 to the bracket 20 by integrally molding the bracket 20 with a resin material by insert molding correspondingly. When assembling the vibration isolator 10, the manufacturing process is simplified and the manufacturing cost is reduced.

In this embodiment, the mounting member is the bracket 20.
Although the apparatus main body is constituted by the main body rubber 16 and the inner tubular metal fitting 14, the bracket 20 and the main body rubber 16
It is also possible to adopt a structure in which an outer cylinder is arranged between the and. In this case, the anti-vibration device 10 can be assembled by preliminarily assembling the inner tubular metal piece 14, the main body rubber 16 and the outer tube and press-fitting the outer tube into the mounting hole 21 of the bracket 20.

Next, a vibration isolator according to a second embodiment of 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 the duplicate description will be omitted.

As shown in FIGS. 4 and 5, the mounting member 30 is attached to the lower flange portion 36 of the mounting member 30 installed in the through hole 22 of the bracket 20 which constitutes the vibration isolator 10 of this embodiment. A pin 42 for preventing the rotation of the above is planted so as to project downward. And pin 4 of the vehicle body 26
A hole portion 44 into which the pin 42 is fitted is formed in a portion corresponding to 2.

Therefore, when the mounting bracket 30 having such a pin 42 is mounted on the bracket 20, not only the function and effect of the first embodiment but also the function of preventing the mounting bracket 30 from rotating are obtained. It will also have an effect.

Next, a vibration isolation device according to a third embodiment of the present invention is shown in FIGS. 6 and 7, 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 the duplicate description will be omitted.

As shown in FIGS. 6 and 7, the elastic body 38, which is a portion facing the pipe portion 32 of the mounting member 30 installed in the through hole 22 of the bracket 20 constituting the vibration isolator 10 of this embodiment. The outer shape of the cylindrical portion 38A is formed into an elliptic cylindrical shape.

Therefore, by forming the elastic body 38 in this way, even if the same force is applied, the deformation amount of the cylindrical portion 38A becomes large in the arrow X direction and the cylindrical portion becomes large in the arrow Y direction in FIG. The deformation amount of 38A becomes small.

From the above, as in the second embodiment, in addition to the function and effect of preventing the rotation of the mounting member 30, the elasticity of the elastic body 38 is directional, and the bracket 20
Therefore, there is a direction of displacement of the mounting bracket 30 with respect to the mounting bracket 30.

Next, a vibration isolator according to a fourth embodiment of the present invention is shown in FIG. 8, 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. 8, the vibration isolation device 1 of the present embodiment.
The pair of flange portions 54 and 56 of the mounting bracket 30 that is to be installed in the through hole 22 of the bracket 20 that configures 0.
Is formed in a square shape, and accordingly, the upper surface portion 38B and the lower surface portion 38C of the elastic body 38 sandwiching the support portion 20A of the bracket 20 from above and below are formed in a square shape.

Therefore, the through hole 22 of the bracket 20 is previously prepared.
Around the periphery of the flange portion 54 and the upper surface portion 38B of the elastic body 38.
By forming a quadrangular recess (not shown) into which the flange fits, the flange portion 54 and the upper surface portion 38B are formed.
Fits in this recess, and the bracket 2 of the mounting bracket 30
Rotation with respect to 0 will be prevented. Therefore, the bracket 20 is attached to the bracket 20 and the elastic body 38 as described above.
When the bracket is attached, not only the action and effect of the first embodiment but also the action and effect of preventing the rotation of the mounting bracket 30 as in the second embodiment are provided. still,
In this embodiment, the flange portion has a quadrangular shape, but may have another polygonal shape.

Next, a vibration isolator according to a fifth embodiment of the present invention is shown in FIG. 9, 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. 9, the vibration isolator 6 according to this embodiment.
Reference numeral 0 denotes a first mounting member 62 having a U-shaped cross section and provided with bolts 66 for connecting the engine, and arranged so as to cover the periphery of the first mounting member and connected to the vehicle body. The main body rubber 70 is configured to connect the through hole 68 that serves as a mounting hole for connecting the second mounting member 64 that is a mounting member formed at the bottom. Then, in the portion of the second mounting member 64 corresponding to the through hole 68, the mounting metal member 30 formed similarly to the first embodiment is provided with the elastic body 38.
Are placed through.

Therefore, the first mounting member 62 and the bolt 66 are
The main body rubber 70 constitutes the main body of the apparatus, and when assembling the antivibration device 60, the antivibration device 60 is arranged and fixed between the vehicle body side (not shown) and the engine side.

As described above, the vibration isolator 60 according to the present embodiment can not only damp vibrations as in the first embodiment, but also improve the mounting reliability of the vibration isolator 60 as in the first embodiment. Come to do.

In the above embodiment, the bracket 20 or the second mounting member 64 is connected to the side of the vehicle body which is the vibration receiving portion, and the inner tubular metal member 14 or the first mounting member 62 is connected to the engine side which is the vibration generating portion. Although the above configuration is connected, the configuration may be reversed.

Further, in the above embodiment, the screw hole is formed on the vehicle body side, but instead of this, a female screw is formed in the pipe portion 32 of the mounting bracket 30, and for example, a bolt is mounted from the vehicle body side on the mounting bracket. It is screwed into 30, and the mounting bracket 30
May be fixed.

As the type of resin material used in the above examples, thermoplastic resin can be used in addition to glass fiber reinforced polyamide resin (eg nylon) from the viewpoint of strength and moldability, but it is not limited to these. Not something.
Further, as the rubber material, natural rubber or natural rubber to which styrene-butadiene rubber is added can be considered, and a plasticizer and a vulcanization accelerator may be appropriately added.

On the other hand, although the purpose of the present invention is to prevent the vibration of the engine mounted on the automobile, the anti-vibration device of the present invention may be used, for example, in the body mount of the automobile or in other applications other than the automobile. Needless to say, the shapes of the mounting bracket, the elastic body and the like are not limited to those of the embodiment.

[0055]

As described above, the vibration isolator of the present invention has the excellent effect that the vibration of a wide range is effectively damped while improving the reliability of mounting the vibration isolator. This has an excellent effect that the reliability of the mounting of the vibration isolator is improved while the manufacturing process is simplified and the wide range vibration is effectively damped.

[Brief description of drawings]

FIG. 1 is a perspective view of a vibration isolation device according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along the line 2-2 of FIG.

FIG. 3 is an enlarged cross-sectional view of a main part of the vibration control device according to the first embodiment of the present invention, showing a state in which the vibration control device is connected to a vehicle body.

FIG. 4 is a perspective view of a mounting bracket used in a vibration damping device according to a second embodiment of the present invention.

FIG. 5 is an enlarged cross-sectional view of a main part of a vibration control device according to a second embodiment of the present invention, showing a state in which the vibration control device is connected to a vehicle body.

FIG. 6 is a perspective view of a mounting bracket used in a vibration damping device according to a third embodiment of the present invention.

7 is a cross section taken along line 7-7 of FIG.

FIG. 8 is a perspective view of a mounting bracket used in a vibration isolator according to a fourth exemplary embodiment of the present invention.

FIG. 9 is a sectional view of a vibration damping device according to a fifth embodiment of the present invention.

FIG. 10 is a diagram showing a vibration isolator according to the prior art,
FIG. 3 is a sectional view corresponding to FIG. 2.

[Explanation of symbols]

 10 Vibration Isolator 14 Inner Cylinder Metal Fitting (Device Main Body) 16 Elastic Body (Device Main Body) 20 Bracket (Mounting Member) 30 Mounting Metal Fitting 32 Pipe Part 34 Flange Part 36 Flange Part 38 Elastic Body 54 Flange Part 56 Flange Part 60 Vibration Isolator 62 First Mounting Member (Device Main Body) 64 Second Mounting Member (Mounting Member) 66 Bolt (Device Main Body) 70 Main Body Rubber (Device Main Body)

Claims (2)

[Claims] 1. A device main body which is connected to one of a vibration generating part and a vibration receiving part and is capable of attenuating the inputted vibration, and for connecting the device main body to the other of the vibration generating part and the vibration receiving part. A mounting member having a mounting hole, a mounting member that covers the inner peripheral surface and the periphery of the mounting hole, and is installed so as to be in direct contact with the other of the vibration generating unit and the vibration receiving unit; An elastic body that is elastically deformable and is interposed between the elastic body and the elastic body. 2. An apparatus main body connected to one of the vibration generating section and the vibration receiving section and capable of attenuating the input vibration, the apparatus main body being attached and integrally formed with a resin material, and the vibration generating section. And a mounting member having a mounting hole for connecting to the other of the vibration receiving portion, a pipe portion covering the inner peripheral surface of the mounting hole, and a flange portion covering the periphery of the mounting hole, and the vibration generating portion and the vibration. A mounting bracket installed so as to be in direct contact with the other of the receiving part, and a mounting bracket interposed between the mounting member and the pipe part of the mounting bracket and between the mounting member and the flange part of the mounting bracket. An anti-vibration device comprising: an elastic body that is elastically deformable.