JPH06307488A - Vibration control device - Google Patents

Abstract

PURPOSE:To provide a vibration control device capable of being easily manufactured while the reliability of a sealing part is maintained. CONSTITUTION:A base plate 12 and an outer frame 16 are calked-fixed to each other in state where they hold the peripheral edge part of a diaphragm 17 and the flange part 32 of a partition wall member 28 formed of a thin-wall metal plate between themselves. In this case, a thick-walled sealing part 17A is provided to the peripheral edge part of the diaphragm 17, and a ring groove 32B into which the sealing part 17A is fitted, and the diametrical outer sidewall 32C for abutting against the base plate 12 to restrict the compression-amount of the outer peripheral part of the diaphragm 17, are provided to the flange part 32. Thus, the outer peripheral part of the diaphragm 17 is moderately compressed to ensure sealing. Further, since a compression-amount restricting part for restricting the compression-amount of the outer peripheral part of the diaphragm 17 is provided to the partition wall member 28 capable of being molded and worked, the need for cutting work for accurate dimensions is eliminated to facilitate manufacture.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid-filled type vibration damping device provided between a vibration generating portion and a vibration receiving portion to absorb vibrations, and particularly, to improve reliability of a sealing portion of a liquid chamber. Regarding a vibration control device.

[0002]

2. Description of the Related Art As a vibration isolator used for an engine mount, a body mount, etc. of a vehicle such as an automobile, there is a liquid filled vibration isolator 100 as shown in FIG.

As shown in FIG. 7, this vibration isolator 100 has a base plate 112 formed by pressing a thick metal plate.
The diaphragm 117, the partition member 128, and the cylindrical outer frame 116 are disposed above the base plate 112.

Similarly to the base plate 112, the outer frame 116 is also formed of a thick metal plate. The outer peripheral portion of the elastic body 118 is vulcanized and adhered to the inner peripheral portion on the upper end side of the outer frame 116, and the mounting member 120 is vulcanized and adhered to the inner peripheral portion of the elastic body 118.

A lower portion 116A of the outer frame 116 has a flange portion 112A of the base plate 112 and a diaphragm 117.
And the outer peripheral portion of the partition wall member 128 is sandwiched.

A space defined by the elastic body 118, the outer frame 116, and the diaphragm 117 is a liquid chamber 126, and the liquid chamber 126 is separated by a partition member 128.
6A and a sub liquid chamber 126B.

A restriction passage 142 is provided in the partition member 128, and the restriction passage 142 connects the pressure receiving liquid 126A and the auxiliary liquid chamber 126B to each other.

[0008]

By the way, in the vibration isolator 100, the liquid chamber 126 seals at the edge portion of the diaphragm 117, so that the edge portion of the elastic body 117 is compressed uniformly and properly. Must.
Therefore, in the vibration isolator 100, the base plate 1
The outer peripheral portion of the twelve flange portions 112A is bent to form a rising portion 112B, and the compression amount of the edge portion of the diaphragm 117 is determined by the height dimension of the rising portion 112B.

However, in this vibration isolation device 100,
Since the height dimension is determined by cutting the rising portion 112B formed by press molding, the manufacturing process is complicated.

In order to omit such cutting, as shown in FIG. 8, the caulking metal fitting 132 is welded to the outer frame 116,
The diaphragm 11 is attached to the step portion 134 of the caulking metal fitting 132.
Although it is conceivable to define the compression amount of the edge portion of No. 7, there is a drawback that the number of parts increases and the welding process also increases.

In consideration of the above facts, an object of the present invention is to provide an anti-vibration device which can be manufactured easily while maintaining the reliability of the seal portion.

[0012]

According to the present invention, there is provided a frame member connected to one of a vibration generating portion and a vibration receiving portion, a mounting member connected to the other of the vibration generating portion and the vibration receiving portion, and the frame member. And an elastic body which is disposed between the mounting member and the mounting member and is deformed when vibration occurs, a liquid chamber provided in the frame member, and the elastic body provided in the frame member as a part of the partition wall. A partition member that divides the liquid chamber into a pressure receiving liquid chamber that can be expanded and contracted, and a sub liquid chamber that communicates with the pressure receiving liquid chamber via a restriction passage,
A diaphragm that constitutes the sub liquid chamber between the partition member and the expandable and contractible sub liquid chamber is connected to the frame member to hold the peripheral edge of the diaphragm together with the peripheral edge of the partition member. And a lid member for compressing the peripheral portion of the diaphragm to seal the liquid chamber, wherein the diaphragm is provided with an annular thick portion in the peripheral portion, and the partition member Is provided with an annular groove portion into which the thick portion fits, and a compression amount limiting portion that abuts the lid member and defines a compression amount of the thick portion.

[0013]

When vibration is input to the vibration isolator according to the present invention, the elastic body is deformed, the liquid moves back and forth through the restriction passage due to the pressure change in the pressure receiving liquid chamber, and the liquid receives passage resistance or resonates in the restriction passage. This absorbs the vibration.

In this vibration isolator, the thick portion provided on the peripheral portion of the diaphragm is sandwiched between the frame member and the lid member together with the peripheral portion of the partition member, and the compression amount of the thick portion is applied to the partition member. Since it is defined by the compression amount limiting portion provided, the liquid chamber is reliably sealed.

Further, the frame member and the mounting member must be connected to a vibration generating portion such as an engine and a vibration receiving portion such as a vehicle body of an automobile to support the load of the engine and the like, and the vibration of the engine and the like, High rigidity is required because it must be subjected to various loads such as compression, tension, bending, etc. in which the action direction due to vibrations is not constant, but since the partition member does not exert the same force as the frame member and mounting member, The partition member has a lower rigidity than the frame member and the lid member, and it is possible to use a material that can be easily processed. For example, the dimensional accuracy is high, such as a press-molded product or a synthetic resin molded product of a thin metal plate, A molded product with good productivity can be used.

[0016]

【Example】

[First Embodiment] FIG. 1 shows a vibration isolator 10 according to a first embodiment of the present invention.

As shown in FIG. 1, the vibration isolator 10 is attached to a vehicle body (not shown) such as an automobile by a mounting bolt 14 fixed to the lower central portion of a base plate 12 as a lid member.

The base plate 12 is formed of a thick metal plate to support the load of the engine, and has a reverse hat-shaped cross section.

A diaphragm 17, a partition member 28, and a cylindrical outer frame 16 as a frame member are disposed above the base plate 12 in FIG.

Like the base plate 12, the outer frame 16 is also formed of a thick metal plate to support the load of the engine. The upper end of the outer frame 16 is expanded in a tapered shape, and the outer peripheral portion of the cylindrical elastic body 18 is vulcanized and adhered to the inner peripheral portion. An inner peripheral portion of the elastic body 18 is vulcanized and adhered to a mounting member 20, and a mounting bolt 24 for fixing an automobile engine (not shown) to a central upper end of the mounting member 20.
Is erected.

The lower portion 16A of the outer frame 16 holds the flange portion 12A of the base plate 12, the outer peripheral portion of the diaphragm 17 and the outer peripheral portion of the partition member 28.

An air chamber 19 is formed between the base plate 12 and the diaphragm 17, and the elastic body 18 and the outer frame 1 are provided.
6, the space defined by the diaphragm 17 is a liquid chamber 26 filled with a liquid such as oil or water.

The liquid chamber 26 is divided into a pressure receiving liquid chamber 26A and a sub liquid chamber 26B by a partition member 28.

The partition member 28 is formed by pressing a thin metal plate. In the partition member 28, a cylindrical portion 30 is extended to an outer peripheral end portion of a disk-shaped partition portion 29, and a flange portion 32 projects radially outward from a lower portion of the cylindrical portion 30.

The outer peripheral surface of the tubular portion 30 is in close contact with the elastic body 18 extending in a thin shape on the inner peripheral surface of the outer frame 16.

As shown in FIGS. 1 and 2, the contact plate 34 is in close contact with the lower surface of the partition wall 29, and the cylindrical portion 36 is integrally extended to the outer peripheral end of the contact plate 34. The outer peripheral surface of the tubular portion 36 is in close contact with the inner peripheral surface of the tubular portion 30.

A C-shaped recess 40 as viewed in the axial direction is formed at the corner between the contact plate 34 and the cylindrical portion 36, and the recess 4 is formed.
0 forms a restriction passage 42 between the partition wall portion 29 and the tubular portion 30.

As shown in FIG. 1, the limiting passage 42 is formed by circular holes 44, 4 formed in a part of the partition 29 and the recess 40.
6 communicates with the pressure receiving liquid chamber 26A and the sub liquid chamber 26B, respectively, and the pressure receiving liquid chamber 26A and the sub liquid chamber 26B communicate with each other via the restriction passage 42.

As shown in FIG. 3, the flange 32 is formed with an annular jetty 32A projecting toward the base plate 12 on the side of the tubular portion 30, and an annular groove 32B is formed outside the jetty 32A. ing.

At the peripheral portion of the diaphragm 17 described above,
Seal portion 17A as a thick portion having a substantially rectangular cross section
When assembled as shown in FIG. 1, the seal portion 17A fits into the annular groove 32B of the partition member 28 and is compressed by a predetermined amount between the seal portion 17A and the flange portion 12A. A part of the inner side in the direction is compressed by a predetermined amount between the jetty 32A and the flange portion 12A.

As shown in FIG. 3, the end portion of the radially outer wall 32C forming the radially outer wall surface of the annular groove 32B abuts the flange portion 12A to reduce the amount of compression of the peripheral edge portion of the diaphragm 17. It has a role as a prescribed compression amount limiting unit.

Here, in the state before assembly, the seal portion 1
The thickness of 7A is T2, and the radial outer wall 32C of the annular groove 32B is 32C.
Of the annular groove 32B is t2, the thickness of the thin portion of the diaphragm 17 is T1, and the dimension of the annular groove 32B from the end of the radially outer wall 32C to the jetty 32A is t2.
When it is set to 1, it is preferable to determine the dimensions t1 and t2 so as to satisfy the following expressions (1) and (2) indicating the compression rate of the diaphragm 17.

(T1−t1) × 100 / T1 = 10 to 50% (1) (T2−t2) × 100 / T2 = 10 to 50% (2) As a result, the outer peripheral portion of the diaphragm 17 is attached to the partition member 2.
It is properly compressed and sandwiched between the flange portion 32 of No. 8 and the flange portion 12A of the base plate 12.

Next, the operation of this embodiment will be described. The vibration isolator 10 is fixed to a vehicle body (not shown) such as an automobile via a mounting bolt 24, and the engine, which is a vibration source, is mounted on the mounting member 20 by the mounting bolt 24.

When the vibration generated in the engine is transmitted to the mounting member 60, the elastic body 18 is deformed, and the liquid moves back and forth through the restriction passage 42 due to the pressure change in the pressure receiving liquid chamber 26A, and the restriction passage 4
At 2, the liquid receives passage resistance or resonates, so that the vibration is absorbed.

The partition member 28 connects the liquid chamber 26 to the pressure receiving liquid chamber 26.
The base plate 12 and the outer frame 1 that support the load of the engine have a role of partitioning into the A and the sub-liquid chamber 26B and have strength enough to withstand a change in hydraulic pressure.
Unlike 6, the wall thickness can be reduced.

The partition wall member 28 formed of a thin metal plate is easy to press-mold and can be finished with high precision. After the thin metal plate is pressed, the partition wall member 28 can be easily trimmed to finish the dimensions and shape of the edge, and the cut edge after cutting is different from the cut edge when a thick plate material is cut. And the radial outer wall 3 of the annular groove 32B by cutting with an edge cutting die.
The depth dimension t2 of the annular groove 32B measured from the end of 2C and the end of the radially outer wall 32C of the annular groove 32B from the jetty 32A
The size t1 up to can be accurately obtained.

Therefore, in the vibration isolator 10 of this embodiment, complicated cutting work after press molding can be omitted,
Further, unlike the conventional anti-vibration device, difficult press working such as rising the peripheral edge portion of the base plate 12 formed of a thick metal plate at a right angle is eliminated, which facilitates manufacturing and improves productivity. The cost can be reduced.

[Second Embodiment] A second embodiment of the present invention is shown in FIG.
Follow the instructions below. It should be noted that this embodiment is a modification of the first embodiment, and the same components as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

As shown in FIG. 4, the vibration isolator 1 according to this embodiment.
At 0, the radially outer wall 32C of the partition member 28 is folded back to be doubled. Therefore, the rigidity of the radially outer wall 32C is increased, and there is no fear of deforming the radially outer wall 32C when the lower portion 16A of the outer frame 16 is caulked.

[Third Embodiment] FIG. 5 shows a third embodiment of the present invention.
Follow the instructions below.

The vibration isolator 10 of this embodiment is equipped with a mounting plate 50 for mounting the vehicle body, and the mounting plate 50 is provided with bolt holes 52.

A circular hole 54 is formed in the mounting plate 50, and a cylindrical outer frame 56 as a frame member is press-fitted and welded into the circular hole 54.

The outer peripheral portion of a cylindrical elastic body 58 is vulcanized and adhered to the upper side of the inner peripheral portion of the outer frame 56 formed of a thick metal plate. A mounting member 60 is vulcanized and adhered to the center of the elastic body 58, and a bolt hole 62 for fixing an automobile engine (not shown) is provided at the upper end of the center of the mounting member 60. An annular elastic body 65 is vulcanized and adhered to the attachment member 60 at an intermediate portion thereof, and an umbrella-shaped elastic body 66 covering the cylindrical cover 64 is adhered to an upper portion thereof.

The upper end of the outer frame 56 has an enlarged diameter, and the lower end of the cylindrical cover 64 is caulked and fixed. Further, the lower portion of the outer frame 56 is processed on the inner peripheral side to form a thin portion 56A.

Inside the outer frame 56, a columnar partition member 68 is inserted below the elastic body 58.
The outer peripheral surface of is in close contact with the elastic body 58 extended in a thin shape on the inner peripheral surface of the outer frame 56.

The diaphragm 17 is provided below the partition member 68.
Also, a diaphragm cover 72 as a lid member is arranged. The diaphragm cover 72 has a planar annular flange portion 72A continuous to the outer periphery of a central portion which is convex downward in an arcuate cross section, and further has a flange portion 72A.
A bent portion 72B is continuously formed at the outer peripheral end of the.

A concave portion 58A is formed in the elastic body 58, and a pressure receiving liquid chamber 70 is formed between the concave portion 58A and the partition member 68.

Since it is not necessary to support the load on the partition member 68, a molded product of synthetic resin can be used. The partition wall member 68 is made of, for example, a synthetic resin molded product,
It may be made of die-cast aluminum alloy or the like.

As shown in FIG. 6, a flange portion 68A is formed on the outer periphery of the lower side of the partition wall member 68, an annular groove 68D is formed at the lower end corner portion, and a bent portion 72B of the diaphragm cover 72 is formed. Is stuck in.

On the other hand, the lower surface of the partition wall member 68 has an annular groove 7
4 is provided, a step portion 76 is provided inside the annular groove 74, and a concave portion 78 is provided inside the step portion 76.

The seal portion 17A of the diaphragm 17 is fitted in the annular groove 74. An auxiliary liquid chamber 80 is provided between the recess 78 and the diaphragm 17, and an air chamber 82 is provided between the diaphragm 17 and the diaphragm cover 72. The air chamber 82 communicates with the outside through an air hole 73 formed in the diaphragm cover 72.

Further, the pressure receiving liquid chamber 70 and the sub liquid chamber 80 are communicated with each other by a restriction passage 84 formed in a spiral shape on the outer periphery of the partition member 68.

By changing the thin-walled portion 56A of the outer frame 56 from the linear cross section shown in FIG. 6 to the crimped state shown in FIG. 5, the peripheral edge portion 72A of the diaphragm cover 72,
The bent portion 72B and the outer peripheral portion of the diaphragm 17 are
It is sandwiched between the end of the thin portion 56A and the step portion 56B.

When the thickness of the seal portion 17A is T2, the depth dimension of the annular groove 74 is t2, the thickness of the thin portion of the diaphragm 17 is T1, and the depth dimension of the stepped portion 76 is t1, the diaphragm is It is preferable to determine t1 and t2 so as to satisfy the above equations (1) and (2) indicating the compression rate of 17.

In order to satisfy the equations (1) and (2),
By determining t1 and t2, the diaphragm 17
The outer peripheral portion of the diaphragm cover 72 and the partition member 68 are
It is properly compressed and sandwiched between.

In this embodiment, the annular convex portion 68B between the annular groove 74 and the annular groove 68D of the partition wall member 68 functions as a compression amount limiting portion.

Next, the operation of this embodiment will be described. In this vibration isolator 10, a mounting plate 50 is fixed to a vehicle body (not shown) such as an automobile, and an engine is mounted on a mounting member 60. When the vibration is transmitted to the attachment member 60, the elastic body 58 is deformed, the liquid moves back and forth through the restriction passage 84 due to the pressure change of the pressure receiving liquid chamber 70, and the liquid receives a passage resistance or resonates in the restriction passage 84, thereby vibrating. Is absorbed.

In this embodiment, since the partition member 68 is a molded product and has high dimensional accuracy, the diaphragm 17 is properly compressed and the vibration isolator 10 can obtain a high sealing property.

Since the partition member 68 is a molded product,
This vibration isolating device 10 is easy to manufacture because it does not require cutting work or the like to obtain dimensional accuracy of the seal portion.
Good productivity.

[0061]

Since the present invention has the above-mentioned structure, it is possible to absorb vibrations in a very wide range of frequencies, and in the manufacturing process, the number of parts can be reduced and the manufacturing process can be shortened.

[Brief description of drawings]

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

FIG. 2 is an exploded perspective view showing a partition member and its related components.

FIG. 3 is an enlarged view of a seal portion showing a state before assembly of the diaphragm of the vibration isolator shown in FIG.

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

FIG. 5 is a vertical cross-sectional view showing a vibration control device according to a third embodiment of the present invention.

FIG. 6 is an enlarged view of a seal portion showing a state before the diaphragm of the vibration isolator shown in FIG. 5 is assembled.

FIG. 7 is a vertical cross-sectional view showing a conventional vibration damping device.

FIG. 8 is a vertical sectional view showing another conventional vibration damping device.

[Explanation of symbols]

 10 Vibration proof device 12 Base plate (lid member) 16 Outer frame (frame member) 17 Diaphragm 17A Seal part (thick part) 18 Elastic body 20 Mounting member 26 Liquid chamber 26A Pressure receiving liquid chamber 26B Sub liquid chamber 28 Partition member 32A Jetty ( 32B annular groove 42 limiting passage 56 outer frame (frame member) 58 elastic body 60 mounting member 68 partition member 70 pressure receiving liquid chamber 72 diaphragm cover (lid member) 74 annular groove 80 sub liquid chamber 84 limiting passage

Claims (1)

[Claims] 1. A frame member connected to one of the vibration generating part and the vibration receiving part, a mounting member connected to the other of the vibration generating part and the vibration receiving part, and between the frame member and the mounting member. An elastic body disposed and deformed when vibration occurs, a liquid chamber provided in the frame member, a pressure receiving liquid chamber provided in the frame member and capable of expanding and contracting as the elastic body as a part of a partition wall, A sub-liquid chamber that communicates with the pressure-receiving liquid chamber via a restricted passage, and a partition member that partitions the liquid chamber, and the sub-liquid chamber is configured between the partition member and the sub-liquid chamber to expand or contract. A diaphragm to be made possible, and a peripheral member of the diaphragm is sandwiched together with a peripheral member of the partition member by being connected to the frame member, and a lid member for compressing the peripheral portion of the diaphragm to seal the liquid chamber, An anti-vibration device comprising: The thick portion of the annular is provided on the edge portion, the partition wall member, an annular groove for fitting the thick portion and,
An anti-vibration device, comprising: a compression amount limiting portion that abuts on the lid member and defines a compression amount of the thick portion.