JPH09280300A - Vibration control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the manufacture, and to provide an optimum rubber material for a membrane and a body rubber. SOLUTION: A thin-walled rubber layer 22 made of the rubber excellent in the ozone resistance is vulcanizing-adhered to an inner circumferential surface of an outer cylinder 16, and a part thereof is a diaphragm 24 and a diaphragm 26. An intermediate cylinder 28 connected to an inner cylinder 32 through an elastic body 30 such as NR is arranged inside the outer cylinder 16. The diaphragm 24, the diaphragm 26, and the elastic body 30 are formed of the rubber of different kind which is most suitable for each property to improve the durability. A die for vulcanization is not complicated, and the cost for the die can be reduced, and the manufacture of a vibration control device 10 is facilitated.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a general industrial machine,
The present invention relates to a vibration isolator used for an engine mount or the like of an automobile, and more particularly to a liquid filled type vibration isolator.

[0002]

2. Description of the Related Art Conventionally, there has been known an anti-vibration device provided as an engine mount between an engine of an automobile and a vehicle body. In recent years, a liquid-filled type vibration damping device having a high vibration damping effect has been proposed as a type of this vibration damping device, and one example thereof will be described below with reference to FIGS. 6 and 7.

As shown in FIGS. 6 and 7, a main body is vulcanized and bonded between the inner cylinder 102 and the intermediate cylinder 104 of the liquid-filled type vibration damping device 100. The rubber 106 is stretched over, and the intermediate cylinder 104 is
It is press-fitted inside the outer cylinder 118.

A concave portion 108 is formed in the main rubber 106, and a main liquid chamber 110 is provided between the concave portion 108 and the intermediate cylinder 104. The main liquid chamber 110 is provided with the orifice fitting 12.
A pair of sub-liquid chambers 114 on the opposite side of the inner cylinder 102 through a restriction passage 112 provided to extend in a U-shape at 0.
One of the sub liquid chambers 114 communicates with the other, and a passage 122 connects between the pair of sub liquid chambers 114.

The main liquid chamber 1 is provided in the pair of sub liquid chambers 114.
The rubber film bodies 116 (so-called diaphragms) that expand and contract according to the pressure change of 10 face each, and these film bodies 116 are vulcanized and bonded to the intermediate cylinder 104. The main body rubber 106 and the rubber film body 116 are vulcanized and molded using the same rubber material by setting the inner cylinder 102 and the intermediate cylinder 104 in the mold.

The vibration isolator 100 is, for example, an inner cylinder 10
2 is connected to an automobile engine, and the intermediate cylinder 104 is connected to an automobile body for use. Here, the vibration isolation device 100
The engine vibration is input to the inner cylinder 102 and the intermediate cylinder 10.
When 4 and 4 are displaced relative to each other in the radial direction (vertical direction in the figure), the main liquid chamber 110 expands and contracts, and the pressure change of the main liquid chamber 110 causes the film body 116 of the sub liquid chamber 114 to elastically deform, thereby limiting the passage 112.
A liquid flows back and forth inside, and a damping force is generated.

[0007]

However, since the vibration isolator as described above has a complicated structure, when the vibration isolator is manufactured, the main rubber and the film body are attached to the inner cylinder and the intermediate cylinder. There is a problem in that vulcanization and adhesion must be performed, resulting in a complicated die, complicated manufacturing work, and high cost.

Further, in this vibration isolator, since the rubber material is integrally vulcanized, only one type of rubber material can be applied when vulcanizing the main rubber and the film body. The rubber material of the main rubber, which occupies the main part, was also used as the rubber material for the film body. However, originally, the purpose of the film body is different from that of the main body rubber, and therefore it is necessary to select the most suitable rubber material for the purpose.

In view of the above facts, it is an object of the present invention to provide an anti-vibration device which facilitates the manufacture and enables the use of optimal rubber materials for the film body and the main rubber.

[0010]

According to a first aspect of the present invention, there is provided an anti-vibration device including an outer cylinder connected to one of a vibration generating portion and a vibration receiving portion and having a plurality of window portions, and an outer cylinder. An intermediate cylinder fitted to the inner peripheral side, an inner cylinder connected to the other of the vibration generating part and the vibration receiving part, and the inner cylinder and the intermediate cylinder provided between the inner cylinder and the intermediate cylinder. And an elastic body that is deformed when vibration is generated, a main liquid chamber that is expandable and contractible by using the elastic body as at least a part of a partition wall, and a liquid is sealed therein, and the main liquid chamber through restricting passages, respectively. A pair of auxiliary liquid chambers that are communicated with each other and are formed corresponding to at least one of the plurality of windows, a film body that covers the inner peripheral surface of the outer cylinder to prevent liquid leakage, and the pair of Can be elastically deformed to the portions corresponding to the plurality of windows of the film body facing the sub liquid chambers of The thickness of the formed and these portions are characterized by comprising a pair of elastic film portion different from each other.

The operation of the vibration isolator according to claim 1 will be described below. When the vibration is transmitted from the vibration generating section to the inner cylinder or the outer cylinder, the elastic body, which is the main rubber, is deformed, and the main liquid chamber expands and contracts accordingly, causing a pressure change in the liquid in the restricted passage. Then, the pressure change is transmitted to the pair of elastic film portions of the film body through the restriction passage and elastically deformed, and the liquid receives passage resistance in the restriction passage or resonates in the liquid column. Therefore, not only is the vibration damped by the deformation of the elastic body,
The vibration is attenuated by the passage resistance of the liquid, the liquid column resonance, or the like, and it becomes difficult to transmit the vibration to the vibration receiving portion side connected to the outer cylinder or the inner cylinder.

An elastic body connects between the inner cylinder and an intermediate cylinder fitted to the inner peripheral side of the outer cylinder, and a main liquid chamber in which a part of the inner wall is formed by this elastic body, and a main liquid A pair of sub-liquid chambers, which are respectively communicated with the chambers via the restriction passages, are provided, and liquid is sealed in these liquid chambers.

Further, a film body for preventing liquid leakage is coated on the inner peripheral surface of the outer cylinder, and a pair of auxiliary liquid chambers are provided at positions corresponding to at least one of a plurality of windows formed in the outer cylinder. It is formed. Then, a pair of elastic film portions are elastically deformable at portions corresponding to the plurality of window portions of the film body respectively facing the pair of sub liquid chambers, and further, the thicknesses of the pair of elastic film portions are mutually different. Is different.

Therefore, since the elastic body and the film body can be formed separately from each other, it is possible to use a simplified mold, the manufacturing work is simple and easy, and the manufacturing cost is reduced. . Further, since the elastic body and the film body can be formed separately, a rubber material that can best exhibit each characteristic can be used for the film body and the main rubber. Therefore, the characteristics such as durability of the vibration isolator are improved.

Furthermore, since the thicknesses of the pair of elastic film portions are different from each other, even if a vibration having a wide range of frequencies is input to the vibration isolator, it is possible to damp the vibration corresponding to the vibration. .

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION A vibration isolation device 10 according to an embodiment of the present invention is shown in FIGS. 1 to 5, and the present embodiment will be described based on these drawings.

As shown in FIGS. 1 to 3, a pair of rectangular holes 18 are formed on the upper side of the outer cylinder 16 forming the outer frame of the vibration isolator 10 according to this embodiment. A small rectangular hole 20 is formed on the lower side of the outer cylinder 16.

A thin rubber layer 22 which is a tubular film body for preventing liquid leakage is vulcanized and adhered to the inner peripheral surface of the outer cylinder 16 to cover the inner peripheral surface of the outer cylinder 16. This thin rubber layer 2
The two portions corresponding to the pair of rectangular holes 18 project elastically deformable inward of the outer cylinder 16 to form a diaphragm 24 as an elastic film portion, and correspond to the small rectangular holes 20 of the thin rubber layer 22. The portion projects inwardly of the outer cylinder 16 so as to be elastically deformable, and also forms a diaphragm 26 as an elastic film portion.

Here, the diaphragm 26 is the diaphragm 2.
The area is smaller than that of the diaphragm 4, and the diaphragm 24 is thicker than the diaphragm 24 to have high rigidity. The diaphragm 24 and the diaphragm 26 are made of rubber having excellent ozone resistance. As the rubber having excellent ozone resistance, butyl rubber, ethylene propylene rubber and the like can be used, but other elastic materials may be used.

An intermediate cylinder 28 is inserted and arranged inside the outer cylinder 16. The intermediate cylinder 28 is made of a steel plate,
As shown in FIG. 2, the outer cylinder 16 spreads to the outer peripheral side at both ends.
Has a pair of flange portions 28B fitted to the inner peripheral side of the. The intermediate portion of the intermediate cylinder 28 is a small-diameter portion 28A formed in a small-diameter, different-diameter cross-sectional shape.

In the intermediate cylinder 28, NR (natural rubber),
Alternatively, the elastic body 30 which is a main rubber formed of rubber or the like in which NR and SBR (styrene-butadiene rubber latex) are mixed is vulcanized and adhered. An inner cylinder 32 extending parallel to the axis of the intermediate cylinder 28 is arranged at the center of the elastic body 30, and the elastic body 30 is vulcanized and bonded to the inner cylinder 32. The position of the axis of the inner cylinder 32 is located slightly above the axis of the intermediate cylinder 28 in the state where no load is applied to the elastic body 30 (the state of FIG. 1).

Below the inner cylinder 32, a metallic stopper 14 having a U-shaped cross section shown in FIG. 2 is arranged by welding to the inner cylinder 32, and the stopper 14 is arranged inside the inner cylinder 32.
It is designed to prevent excessive displacement of the. Further, a recess 34 is formed in a portion of the elastic body 30 below the inner cylinder 32, and a notch 28D is formed in the intermediate cylinder 28 so as to match the recess 34.

The upper side of the small-diameter portion 28A of the intermediate cylinder 28 is formed as a concave portion 28C whose cross-sectional shape is depressed in an inverted V-shape. An elastic body 30 is provided between the recess 28C and the inner cylinder 32.
A void portion 40 is formed so as to pass through in the axial direction. still,
The cross section of the void 40 shown in FIG. 1 has an inverted V-shape like the recess 28C.

On the other hand, the small diameter portion 28A of the intermediate cylinder 28 and the outer cylinder 1
A partition metal fitting 38 formed in an arc shape is disposed between the partition metal fitting 6 and 6. In the central portion of FIG. 1 of the partition fitting 38,
A pair of openings 38A are formed so as to penetrate the partition fitting 38 in the vertical direction. Further, FIG.
On the upper and left sides, a hole 38B penetrating the partition fitting 38 and a groove 38C extending from this hole 38B to the left end of the partition fitting 38 are formed.

Further, the space between the recessed portion 34 of the elastic body 30 and the partition metal fitting 38 serves as the main liquid chamber 36, and the space portion on the upper side of the intermediate cylinder 28 is the first sub-face facing the diaphragm 24. The liquid chamber 42 is formed, and the space below the partition fitting 38 is formed as a second auxiliary liquid chamber 44 facing the diaphragm 26. The main liquid chamber 36 and the first sub liquid chamber 42 are communicated with each other by the first limiting passage 50 formed by the hole 38B and the groove 38C of the partition fitting 38, and the main liquid chamber 36 and the second sub liquid chamber 42 are communicated with each other. The liquid chamber 44 is communicated with a second restriction passage 52 formed by a pair of openings 38A of the partition fitting 38.

The main liquid chamber 36 and the first auxiliary liquid chamber 4 are
A liquid such as water or oil is sealed in the second and second auxiliary liquid chambers 44, the first limiting passage 50 and the second limiting passage 52.
The anti-vibration device 10 is inserted and fixed to a mounting frame (not shown) for mounting the vehicle.

As described above, when the mounting frame is mounted on the vehicle body and the inner cylinder 32 is connected to the engine by bolts or the like, the load of the engine is that the inner cylinder 32, the elastic body 30, the intermediate cylinder 28,
It is supported by the vehicle body via the outer cylinder 16 and the mounting frame. When the load of the engine is applied to the inner cylinder 32, the axis of the inner cylinder 32 comes to substantially coincide with the axis of the intermediate cylinder 28.

Next, the operation of the present embodiment will be described. When vibration is transmitted from the engine side to the inner cylinder 32, the elastic body 30
Is deformed, the main liquid chamber 36 is expanded or contracted accordingly, and a pressure change occurs in the liquid in the restriction passages 50, 52. Then, the pressure change via the restriction passages 50, 52 causes the auxiliary liquid chambers 42, 44 to change.
Is transmitted to the pair of diaphragms 24 and 26, which are the wall portions of, and elastically deformed. As a result, the liquid flows into the restricted passage 5
In addition to receiving passage resistance in 0, 52 or liquid column resonance, vibration is attenuated by deformation of the elastic body 30 and vibration is also attenuated by liquid passage resistance or liquid column resonance. Vibration is less likely to be transmitted to the vehicle body side connected to 16.

Further, an elastic body 30 connects between the inner cylinder 32 and the intermediate cylinder 28 fitted to the inner peripheral side of the outer cylinder 16, and a thin rubber layer for preventing liquid leakage from the vibration isolator 10. 22 covers the inner peripheral surface of the outer cylinder 16, and a pair of auxiliary liquid chambers 42 and 44 are provided at positions corresponding to the rectangular holes 18 and the small rectangular holes 20 which are the plurality of windows formed in the outer cylinder 16, respectively. It is formed.
A pair of diaphragms 24, 26 are elastically deformable at the portions of the thin rubber layer 22 facing the pair of auxiliary liquid chambers 42, 44 corresponding to the rectangular holes 18 and the small rectangular holes 20, respectively. A pair of diaphragms 24, 2
The thicknesses of 6 are different from each other.

Specifically, the rigidity of the diaphragm 26 of the second auxiliary liquid chamber 44 is made higher than that of the diaphragm 24 of the first auxiliary liquid chamber 42, and the diaphragm 26 is a hard spring.

Therefore, when the vibration input from the engine is the low-frequency large-amplitude vibration which is the shake vibration and the idle vibration, the liquid moves back and forth through the first limiting passage 50 connected to the diaphragm 24 having the low rigidity, and the first A large damping force is generated due to the passage resistance in the restriction passage 50. When the vibration input from the engine is a high-frequency small-amplitude vibration that produces a muffled sound, the liquid is connected to the high-rigidity diaphragm 26 while the first restriction passage 50 is clogged. The vibration isolation device 1 resonates in the liquid column inside the passage 52.
The dynamic spring constant of 0 is reduced.

That is, since the thickness of the diaphragm 24 and the thickness of the diaphragm 26 are different from each other, even if a vibration having a wide range of frequencies is input to the vibration isolator 10, the vibration should be attenuated in response to the vibration. Is possible.

Further, in the vibration isolator 10 of the present embodiment, as shown in FIGS. 4 and 5, the diaphragm 24 and the diaphragm 26 are vulcanized and bonded to the outer cylinder 16, and the elastic body 30 is made of the inner cylinder 32. Further, since the vulcanization is adhered to the intermediate cylinder 28, the mold for vulcanization molding is not complicated, the cost of the mold is reduced, and the vibration isolator 10 is easily manufactured. Manufacturing costs are reduced.

Further, since the diaphragm 24 and the diaphragm 26 are integrally formed with the thin rubber layer 22 adhered to the outer cylinder 16, the manufacturing cost of the diaphragms 24 and 26 is reduced, and the vibration isolator 10 is provided. Further contributes to reduction of manufacturing cost.

On the other hand, the diaphragms 24 and 26 and the elastic body 3
Along with the molding of 0 and 0 separately, the diaphragm 24,
26 and the elastic body 30 can be molded from different types of rubber that best suits their respective characteristics.

Therefore, although the diaphragm 24 and the diaphragm 26 are thin and weak against cracks and the like, the use of rubber having excellent ozone resistance can prevent ozone cracks from occurring and improve durability. In an automobile engine room or the like, it is often exposed to high temperatures, but a material having excellent heat resistance can be selected to improve the life.

On the other hand, in the above-described embodiment, the diaphragm 24 reduces the shake vibration and the idle vibration, and the diaphragm 26 reduces the muffled sound. However, for example, the diaphragm 24 reduces only the shake vibration and the idle vibration. It is possible to reduce only the vibration, and further, the diaphragm 24 may reduce the shake vibration and the diaphragm 26 may reduce the idle vibration. The number of auxiliary liquid chambers in which these diaphragms form part of the wall surface is not limited to one, and may be three or more.

In the above embodiment, the outer cylinder is connected to the vehicle body side which is the vibration receiving portion and the inner cylinder is connected to the engine side which is the vibration generating portion. Is also good.

On the other hand, although the purpose of the present invention is to prevent the vibration of the engine mounted in the automobile, the vibration isolator of the present invention can be used, for example, in the body mount of the automobile or in other applications other than the automobile. Needless to say
Further, the shapes and dimensions of the elastic body, the diaphragm, and the like are not limited to those of the embodiment.

[0040]

The anti-vibration device of the present invention has the above-described structure, and therefore has the excellent effects of facilitating the manufacture and enabling the use of the optimum rubber material for the film body and the main rubber.

[Brief description of drawings]

FIG. 1 is a horizontal cross-sectional view of a vibration control device according to an embodiment of the present invention, which is a cross-sectional view taken along line 1-1 of FIG.

FIG. 2 is a sectional view taken along line 2-2 of the vibration isolator shown in FIG.

FIG. 3 is a perspective view of a vibration isolation device according to an embodiment of the present invention.

4 is a cross-sectional view showing the outer cylinder in a state in which a thin rubber layer applied to the vibration damping device according to the embodiment of the present invention is adhered, and is a cross-sectional view taken along line 4-4 of FIG. .

5 is a cross-sectional view showing the outer cylinder in a state in which a thin rubber layer applied to the vibration damping device according to the embodiment of the present invention is adhered, and is a cross-sectional view taken along line 5-5 of FIG. .

FIG. 6 is a cross-sectional view of a conventional vibration damping device.

FIG. 7 is a sectional view taken along the axis of a conventional vibration damping device.

[Explanation of symbols]

 10 Vibration Isolator 16 Outer Cylinder 22 Thin Rubber Layer (Film Body) 24 Diaphragm (Elastic Membrane Part) 26 Diaphragm (Elastic Membrane Part) 28 Intermediate Cylinder 30 Elastic Body 32 Inner Cylinder 36 Main Liquid Chamber 42 First Sub Liquid Chamber 44 Fourth 2 side liquid chamber

Claims (1)

[Claims] 1. An outer cylinder connected to one of a vibration generating portion and a vibration receiving portion and having a plurality of windows formed therein, an intermediate cylinder fitted to an inner peripheral side of the outer cylinder, and a vibration generating portion and An inner cylinder connected to the other of the vibration receiving parts; an elastic body provided between the inner cylinder and the intermediate cylinder, connecting the inner cylinder and the intermediate cylinder, and deforming when vibration occurs; A main liquid chamber in which the body is expandable / contractible as at least a part of the partition wall and a liquid is sealed therein, and the main liquid chamber communicates with the main liquid chamber via restriction passages and corresponds to at least one of the plurality of windows. A pair of sub-liquid chambers formed respectively, a film body that covers the inner peripheral surface of the outer cylinder to prevent liquid leakage, and the plurality of windows of the film body that respectively face the pair of sub-liquid chambers. The parts corresponding to the parts are elastically deformable and the thickness of these parts are mutually Vibration damping device being characterized in that a pair of the elastic membrane portion, the composed.