JPH08135721A - Vibration control device - Google Patents

Abstract

PURPOSE: To provide a vibration control device which has such a structure that each of an elastic material of an elastic body for absorbing vibration and the elastic material forming the elastic film of sub fluid room is selected most adequately as well as forming a long orifice, in a vibration proof device. CONSTITUTION: The first resin influx preventing cover 32 in which diaphragms 36L, 36R are vulcanizedly-attached is fittedly-attached on a narrow width groove 26 of an elastic body 16, and the second resin influx preventing cover 38 and a controlling pathway forming cover 56 are covered in the outer circumference thereof. An outer cylinder 12 is molded on the outside of the cover 56, by mounting this in a mold and injecting a synthetic resin. Most adequate materials can be used respectively for the elastic body 16 and the diaphragms 36L, 36R because those are separate bodies, and long life of the vibration control device 10 with securing ozone-proof and settling-proof properties is ensured, by using butyl gum or the like as the diaphragms 36L, 36R.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration isolator applied to, for example, automobiles and general industrial machines to absorb vibrations from a vibration generating part, and more particularly to a vibration isolator having an outer cylinder part made of a resin molded product. .

[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.

A liquid-filled bush type vibration damping device is used as this type of vibration damping device. In a bush type vibration damping device, a rubber elastic body (and intermediate cylinder) in a cylindrical shape is vulcanized and bonded to the outer circumference of the inner cylinder, and this is inserted into the outer cylinder to prevent slipping and sealing. The end of the cylinder is drawn. After mounting the inner cylinder, the outer cylinder is press-fitted into a mounting bracket to be mounted on the body of the automobile.

In recent years, there has been a demand for a reduction in the number of parts, a reduction in the number of assembling steps, a reduction in weight, and the like, and resin molding of the parts has been studied.

Therefore, the applicant of the present application has proposed a vibration damping device in which the outer cylinder and the mounting bracket are integrated to reduce the number of assembling steps (Japanese Patent Application No. 5-306843).

In this vibration isolator, an elastic body provided with an inner cylinder metal fitting is arranged in a mold, and a resin is injection-molded on the outer peripheral side of the inner cylinder, the elastic body and an outer cylinder integrated with a mounting bracket. It has become.

[0007]

However, since the outer circumference of the elastic body is covered with the resin, a groove is provided on the outer circumference of the elastic body as in the vibration isolator having a structure before the outer cylinder is made of resin. Since the orifice cannot be formed by covering with the outer cylinder, the opening is formed in the outer cylinder, and the partition member for forming the orifice is inserted from this opening toward the concave portion of the elastic body. Therefore, there is a limit to increase the opening area of the opening, and it is difficult to increase the size of the partition member to form a long orifice.

In consideration of the above facts, the present invention provides a vibration isolator capable of forming a long orifice and optimally selecting an elastic material for absorbing vibration and an elastic material for forming an elastic film. The purpose is to do.

[0009]

According to a first aspect of the present invention, there is provided an outer cylinder which is connected to one of the vibration generating portion and the vibration receiving portion and is integrally molded with resin, and the vibration generating portion and the vibration receiving portion. An inner cylinder connected to the other of the outer cylinders and arranged inside the outer cylinder, and an elastic body arranged between the outer cylinder and the inner cylinder so as to connect the outer cylinder and the inner cylinder. And a pressure receiving liquid chamber in which at least a part of the inner wall is formed by the elastic body,
A protective liquid provided with a sub-liquid chamber which is provided at a position separated from the pressure-receiving liquid chamber in the circumferential direction and which is partially formed of an elastic film, and a restriction passage which connects the pressure-receiving liquid chamber and the sub-liquid chamber. In the vibrating device, the limiting passage is formed in at least one of the elastic body and a plate-like member interposed between the outer cylinder and the elastic body and curved along an outer periphery of the elastic body. The recessed portion is configured to be closed by the opposing counterpart, and the elastic film is provided on the plate-shaped member separately from the elastic body.

Further, according to a second aspect of the present invention, an outer cylinder connected to one of the vibration generating portion and the vibration receiving portion and integrally formed of resin, and connected to the other of the vibration generating portion and the vibration receiving portion. An inner cylinder disposed inside the outer cylinder, an elastic body disposed between the outer cylinder and the inner cylinder so as to connect the outer cylinder and the inner cylinder, and an inner wall A pressure receiving liquid chamber formed at least partially by the elastic body, a sub liquid chamber provided at a position separated from the pressure receiving liquid chamber in the circumferential direction, and a part formed by an elastic film, and the pressure receiving liquid chamber, A vibration damping device, comprising: a limiting passage that connects the auxiliary liquid chamber, wherein the limiting passage is interposed between the outer cylinder and the elastic body and curved along an outer periphery of the elastic body. The recess formed in at least one of the first plate-shaped member and the second plate-shaped member is Is busy is configured, the elastic membrane is characterized in that said elastic member is provided on at least one of separately said first plate-like member and the second plate-like member.

[0011]

In the vibration isolator according to claim 1, the limiting passage is formed in at least one of the elastic body and the plate-like member interposed between the outer cylinder and the elastic body and curved along the outer periphery of the elastic body. The recessed portion formed is closed by the opposing partner. That is, when a groove-shaped concave portion is formed on the outer peripheral surface of the elastic body and the concave portion is closed by the plate-shaped member to form the restricted passage, the groove-shaped concave portion is formed on the elastic body side of the plate-shaped member. When the recessed portion is closed by the outer peripheral surface of the elastic body to form the restricted passage, a groove-shaped recessed portion is formed on both the outer peripheral surface of the elastic body and the elastic body side of the plate member, and both recessed portions are formed. There may be a case where the restriction passages are formed facing each other. The outer cylinder of the vibration isolator can be formed by first arranging the elastic body and the plate-shaped member at predetermined positions in the mold and injecting resin into the mold. Here, this plate-shaped member is curved along the outer periphery of the elastic body and can be brought into close contact with the outer periphery of the elastic body. It is possible to prevent resin from entering. Therefore, the step of assembling the partition wall member or the like forming the restricted passage after the resin molding of the outer cylinder is not required. Furthermore, since the length of the restriction passage is not limited by the size of the partition member in principle, and the space between the elastic body and the outer cylinder can be used freely, the restriction passage can be made long, It is possible to increase the damping force.

Further, since the elastic film and the elastic body are separately provided, the elastic film and the elastic body can be formed by different kinds of elastic bodies, and the elastic body most suitable for the use environment can be selected. it can. For example, a rubber material having excellent ozone resistance can be used for the elastic film, and a rubber material having excellent fatigue resistance can be used for the elastic body. As a result, both performance and cost can be achieved.

Further, in the vibration isolator according to the second aspect, the first plate-shaped member in which the restricting passage is interposed between the elastic body and the outer cylinder and the elastic body and curved along the outer periphery of the elastic body. And the second
The concave portion formed on at least one of the plate-shaped members is closed by the other facing member. The outer cylinder of the vibration isolator may be formed by first arranging the elastic body, the first plate-shaped member and the second plate-shaped member at predetermined positions in the mold, and injecting resin into the mold. it can. Here, since the first plate-shaped member and the second plate-shaped member are curved along the outer circumference of the elastic body and can be brought into close contact with the outer circumference of the elastic body, the concave portion is formed at the time of molding the outer cylinder. It is possible to prevent the resin from entering the restricted passage (space) formed in (3). Therefore, the step of assembling the partition wall member or the like forming the restricted passage after the resin molding of the outer cylinder is not required. Furthermore, since the length of the restriction passage is not limited by the size of the partition member in principle, and the space between the elastic body and the outer cylinder can be used freely, the restriction passage can be made long, It is possible to increase the damping force.

Further, since the elastic film and the elastic body are separately provided, the elastic film and the elastic body can be formed by different kinds of elastic bodies, and the elastic body most suitable for the environment of use can be selected. it can. For example, a rubber material having excellent ozone resistance can be used for the elastic film, and a rubber material having excellent fatigue resistance can be used for the elastic body. As a result, both performance and cost can be achieved.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An anti-vibration device according to an embodiment of the present invention is shown in FIGS. 1 to 6, and this embodiment will be described based on these drawings.

As shown in FIG. 1, a vibration isolator 1 of this embodiment.
Reference numeral 0 denotes a bracket-integrated outer cylinder 12 integrally molded of a synthetic resin, and an arm 12A protruding to one side of the outer cylinder 12 toward a vehicle body (not shown) side of a vehicle as a vibration receiving portion. The outer cylinder 12 is screwed by using an embedded nut 18 fixed to. Therefore, the outer cylinder 12 is connected to the vehicle body.

As shown in FIGS. 1 and 2, this outer cylinder 12
An inner cylinder metal fitting 14 formed in a circular tube shape is provided inside the outer cylinder 1
It is arranged so as to be parallel to the axis line of No. 2, and the inner cylinder fitting 14 is connected to the engine (not shown) serving as a vibration generating part by screwing a bolt (not shown) into the inner cylinder fitting 14. Becomes

An elastic body 16 is arranged between the inner cylinder fitting 14 and the outer cylinder 12. As the elastic material of the elastic body 16, natural rubber or a blend of natural rubber and SBR (styrene-butadiene rubber) can be used, but other elastic materials may be used.

As shown in FIG. 3, the elastic body 16 is formed into a cylindrical shape by being vulcanized and adhered to the outer peripheral surface of the inner tubular member 14, and as shown in FIGS. 1 and 2, the outer periphery of the axially intermediate portion. On the side, a recess 20 is formed on the lower side of the inner tubular fitting 14 in the figure.

As shown in FIGS. 1 and 3, the elastic body 16 is formed with a through hole 22 having a V-shaped cross section, which penetrates in the axial direction, on the opposite side of the recess 20 with the inner tubular metal fitting 14 interposed therebetween. Cage,
The inner tubular member 14 is easily displaced in the vertical direction, which is the main vibration direction of the vibration isolator 10.

A wide groove 24 is formed on the outer circumference of the elastic body 16 so as to make one round along the outer circumference.
A narrow groove 26 extending in the circumferential direction is formed in the axially intermediate portion of the wide groove 24.

The narrow groove 26 is formed with an opening 28L and an opening 28R which penetrate the through hole 22.

In this narrow groove 26, 2 as shown in FIG.
A first resin inflow prevention cover 32 made of a semi-arcuate metal plate is fitted and closely attached. The first resin inflow prevention cover 32 has holes 34L and 34R formed at positions facing the openings 28L and 28R. The edge portions of these holes 34L, 34R are bent inward by a predetermined dimension, and the peripheral edge portions of the diaphragms 36L, 36R that are convex inward are vulcanized and adhered to these edge portions.

As the elastic material of these diaphragms 36L and 36R, butyl rubber or the like is used when importance is attached to ozone resistance and settling resistance, and when importance is attached to elongation, natural rubber and EPT (ethylene, propylene, terpolymer) are used. )
A material obtained by blending and can be used, but other elastic materials may be used.

As shown in FIG. 2, a second resin inflow prevention cover 38 (see FIG. 5) made of a metal plate is fitted in the wide groove 24, and the second resin inflow prevention cover 38 is inside. Near both ends of the above, the central portion in the axial direction is in close contact with the outer periphery of the first resin inflow prevention cover 32.

As shown in FIG. 5, the second resin inflow prevention cover 38 can be divided into two parts.

As shown in FIG. 2, the elastic body 16 is made of a metal elastic body deformation preventing ring 4 so that a part of the second resin flow-in prevention cover 38 is brought into close contact with both ends of the elastic body 16.
0 is buried.

As shown in FIGS. 1 and 2, the recess 20 of the elastic body 16 is closed by the second resin inflow prevention cover 38 to form a main liquid chamber 42 as a pressure receiving liquid chamber.

As shown in FIG. 1, a first sub-liquid chamber 44 is provided between the diaphragm 36L and the second resin inflow prevention cover 38, and a first auxiliary liquid chamber 44 is provided between the diaphragm 36R and the second resin inflow prevention cover 38. The second sub-liquid chamber 46.

As shown in FIGS. 1, 5 and 6, the second resin inflow prevention cover 38 has an arrow L in the main liquid chamber 42.
An opening 48 and a small opening 50 are formed in the corner portion on the direction side, an opening 52 is formed at a position corresponding to the diaphragm 36R, and a small opening 54 is formed corresponding to the diaphragm 36L.

As shown in FIGS. 1 and 2, a restriction passage forming cover 56 as a plate-shaped member made of a metal plate is arranged outside the second resin inflow prevention cover 38.
As shown in FIG. 7, the restricted passage forming cover 56 is formed with wide grooves 58 and narrow grooves 60 as concave portions inside by press molding or the like. Wide groove 58 and narrow groove 60
6 extend in the circumferential direction, and the wide groove 58 is closed by the second resin inflow prevention cover 38 to form an idle orifice 62 as shown in FIG. 6, and the narrow groove 60 is shown as shown in FIG. Is closed by the second resin inflow prevention cover 38 to form a shake orifice 64.

As shown in FIG. 6, the idle orifice 6
2 has one end communicating with the main liquid chamber 42 through the opening 48 and the other end communicating with the second sub liquid chamber 46 through the opening 52.
On the other hand, as shown in FIG. 1, the shake orifice 64 is
One end communicates with the main liquid chamber 42 through the small opening 50, and the other end communicates with the first sub liquid chamber 44 through the small opening 54.

As shown in FIGS. 1 and 2, the outer peripheral surfaces of the restricting passage forming cover 56, the second resin inflow prevention cover 38, and the elastic body 16 on both outer sides of the wide groove 24 are the inner peripheral surface of the outer cylinder 12. Is glued to.

The main liquid chamber 42 and the first sub-liquid chamber 4
4, the second auxiliary liquid chamber 46, the idle orifice 62, and the shake orifice 64 have liquids 6 such as water and oil.
6 is enclosed. The liquid 66 is injected from an injection port 68 that penetrates the outer cylinder 12, the restricted passage forming cover 56, and the second resin inflow prevention cover 38, and is sealed with a blind rivet 70 after the injection. .

Further, the diaphragm 36L has higher rigidity against hydraulic pressure than the diaphragm 36R.

Next, the assembly of the vibration isolator 10 according to this embodiment will be described. At the time of assembling the vibration isolator 10, the elastic body 16 is vulcanized and adhered around the inner tubular metal member 14 to obtain the state shown in FIG.

Next, the first resin flow-in prevention cover 32 (see FIG. 4) in which the diaphragms 36L and 36R are pre-vulcanized and bonded is fitted into the narrow groove 26 of the elastic body 16.

Next, the first resin inflow prevention cover 32
The second resin inflow prevention cover 38 (see FIG. 5) and the restricted passage forming cover 56 (see FIG. 7) are covered on the outer side of.

Next, the first resin inflow prevention cover 3
2. The elastic body 16 and the embedded nut 18 to which the second resin inflow prevention cover 38 and the restricted passage forming cover 56 are attached are loaded in a predetermined position in a mold (not shown) for molding the outer cylinder, and the molten synthetic resin is molded. It shoots in.
As a result, the synthetic resin is adhered to the outer peripheral portions of the elastic body 16, the restricted passage forming cover 56, the second resin inflow prevention cover 38, etc., and the outer cylinder 12 integrated with these components is molded.

In this way, the outer cylinder 12 is molded with the resin material, and the recess 2 formed in the outer peripheral portion of the elastic body 16 is used.
Since 0 is covered with the second resin inflow prevention cover 38 and the restricted passage forming cover 56, the recess 20 is not filled with the resin material when the resin material is injected, and the main liquid chamber 4 is prevented.
2 can be obtained. Further, the resin material can be prevented from entering the through hole 22 by inserting the protruding portion of the mold.

Further, the elastic body deformation prevention ring 40 can suppress the deformation of the elastic body 16 due to the pressure at the time of resin molding, and the second resin inflow prevention cover 38 and the elastic body 1 can be prevented.
It is possible to reliably prevent the resin from entering the concave portion 20 and the like from between 6 and 6.

Thereafter, the outer cylinder 12 is taken out of the mold, a predetermined liquid is injected into the inside through the injection port 68, and the blind rivet 70 is sealed to complete the assembly of the vibration isolator 10.

The outer cylinder 12 of the vibration isolator 10 thus completed is screwed and connected to the vehicle body side of the automobile, and the inner cylinder metal fitting 14 is connected to the engine through bolts. When the vibration isolator 10 is installed in the vehicle body, a force due to the load of the engine is applied to the inner tubular metal fitting 14, so that the inner tubular metal fitting 14 is substantially coaxial with the outer tubular body 12.

Next, the operation of this embodiment will be described. When the vibration of the engine is transmitted to the inner tubular metal member 14, the elastic body 16 is deformed to expand and contract the main liquid chamber 42, and the liquid 40 flows through the idle orifice 62 or the shake orifice 64 to attenuate the vibration. For example, during low-frequency vibrations such as engine shake, the vibrations are damped by the resistance of the liquid 40 flowing through the shake orifice 64, and during idling or the like, the liquid 40 resonates in the liquid column at the idle orifice 62 and the vibrations are damped.

In the vibration isolator 10 of this embodiment, the elastic body 16
Since the diaphragm and the diaphragms 36L and 36R are separate bodies, it is possible to use an elastic material most suitable for each purpose. If butyl rubber or the like is used for the diaphragms 36L and 36R, the ozone resistance and the settling resistance are ensured and the vibration isolation is achieved. The life of the device 10 can be extended.

In this embodiment, the wide groove 58 and the narrow groove 60 are formed in the restricted passage forming cover 56 to form the orifice, but the wide groove and the width are formed in the second resin inflow prevention cover 38. The narrow groove may be formed to form the orifice. In this case, the first resin inflow prevention cover 32 is formed with a concave portion corresponding to the wide groove and the narrow groove, and a groove is formed in the outer peripheral portion of the elastic body 16 corresponding to the orifice. [Second Embodiment] A second embodiment of the present invention will be described with reference to FIGS. This embodiment is a modification of the first embodiment, and the same components are designated by the same reference numerals and the description thereof will be omitted.

As shown in FIGS. 8 to 12, the vibration isolator 10 of the second embodiment has substantially the same structure as the vibration isolator 10 of the first embodiment, but the shape of the orifice and the like are different. Is different.

As shown in FIG. 8, the restricted passage forming cover 56 of this embodiment has a cylindrical shape which can be divided into two. The narrow groove 60 formed in the restricted passage forming cover 56 is
It is bent on the side of the first sub liquid chamber 44. Thus, the narrow groove 6
By bending 0, the total length of the shake orifice 64 can be increased, and a large damping force for low frequency vibration can be obtained.

Also in this embodiment, it is possible to form the orifice by forming the wide groove and the narrow groove in the second resin inflow prevention cover 38.

The other operational effects are similar to those of the first embodiment. [Third Embodiment] A third embodiment of the present invention will be described with reference to FIGS.
Follow the instructions below. This embodiment is a modification of the first embodiment, and the same components are designated by the same reference numerals and the description thereof will be omitted.

As shown in FIG. 13, a wide groove 100 is formed on the outer periphery of the elastic body 16 at an axially intermediate portion, and the wide groove 100 has a recess 102 at a portion corresponding to the through hole 22.
Are formed.

Further, in the axial middle portion of the wide groove 100,
A narrow groove 104 is formed which connects the recess 102 and the recess 20 (not shown in FIG. 13).

As shown in FIGS. 14 and 15, a first resin inflow prevention cover 106 is fitted in the wide groove 100 at a portion corresponding to the recess 102. The first resin inflow prevention cover 106 has the same shape as the first resin inflow prevention cover 106 shown in FIG. 4 of the first embodiment, but the rigidity of the diaphragm 36L and the rigidity of the diaphragm 36R are the same. ing.

A second resin inflow prevention cover 108 as a plate member is fitted in the wide groove 100 on the main liquid chamber 42 side. The outer edges of the first resin inflow prevention cover 106 and the second resin inflow prevention cover 108 are in contact with each other.

A fine groove 110 is formed in the axially intermediate portion of the second resin inflow prevention cover 108. One of the narrow grooves 110 is opened at one end in the outer circumferential direction in the longitudinal direction, and the other end in the longer direction is terminated before the end in the outer circumferential direction on the opposite side. The cylindrical third resin inflow prevention cover 1 arranged outside the prevention cover 106 and the second resin inflow prevention cover 108.
Surrounded by 12 is an orifice 114.

As shown in FIGS. 14 and 15, the elastic body 1
The recess 20 of 6 is closed by the second resin inflow prevention cover 108 to form the main liquid chamber 42, and the recess 102 is surrounded by the first resin inflow prevention cover 106 and the auxiliary liquid chamber 1 is formed.
16 are formed.

One of the orifices 114 is the narrow groove 1
It communicates with the main liquid chamber 42 through an opening 118 formed in the other longitudinal direction of 10, and the other communicates with the sub liquid chamber 116.

As shown in FIGS. 14 and 15, the outer peripheral surfaces of the third resin flow-in prevention cover 112 and the elastic body 16 on both outer sides of the wide groove 100 are the same as in the above embodiment.
It is bonded to the inner peripheral surface of 2.

The anti-vibration device 10 of this embodiment is also constructed by the same steps as those of the above-mentioned embodiment, and the first resin inflow prevention cover 106, the second resin inflow prevention cover 108 and the third resin inflow prevention cover 108 and the third resin inflow prevention cover 108 are provided. The resin inflow prevention cover 112 is fitted in a predetermined position of the elastic body 16 and loaded into the mold, and the molten synthetic resin is injected into the mold to mold the outer cylinder 12.

Next, the operation of this embodiment will be described. When the vibration of the engine is transmitted to the inner tubular member 14, the elastic body 16 is deformed, the main liquid chamber 42 is expanded and contracted, and the liquid 40 causes the orifice 11 to move.
4 and the vibration is attenuated.

Also in the vibration isolator 10 of this embodiment, since the elastic body 16 and the diaphragms 36L, 36R are separate bodies, it is possible to use an elastic material most suitable for each purpose. Butyl rubber or the like is used for the diaphragms 36L, 36R. If used, ozone resistance and settling resistance can be secured and the life of the vibration isolator 10 can be extended.

In the present embodiment, when the internal pressure of the main liquid chamber 42 increases, the liquid 66 flows into the sub liquid chamber 116 and the diaphragms 36L and 36R are deformed to the atmosphere side (radially outside), but these diaphragms 36L and 36R. Is the main liquid chamber 4 in advance
Since it is formed in a concave shape toward the second side, the liquid 6
Even if 6 flows in, large tension does not act on the diaphragms 36L and 36. Therefore, it is possible to improve the durability of the diaphragms 36L and 36 as compared with the first and second embodiments.

In this embodiment, the narrow groove 104 formed on the outer periphery of the elastic body 16 is fitted in the narrow groove 110 portion of the second resin inflow prevention cover 108, but it corresponds to the narrow groove 104. Even if the narrow groove 110 is not formed in the portion to be formed, the orifice 114 can be configured by the narrow groove 104 and the third resin inflow prevention cover 112.

In the first to third embodiments, the outer cylinder 12 is connected to the vehicle body side which is the vibration receiving portion, and the inner cylinder metal fitting 14 is connected to the engine side which is the vibration generating portion. The configuration may be reversed.

In the first to third embodiments, the inner cylinder is made of metal fittings, but it may be made of resin.
The types of resin materials used in the above-mentioned examples are AB
S, polyacetal and the like are conceivable, but not limited thereto.

Further, in the above-mentioned first to third embodiments, the purpose of the present invention is to prevent the vibration of the engine mounted on the automobile. Needless to say, the elastic bodies, stoppers, etc. are not limited to those of the embodiment in shape and size.

[0067]

As described above, since the vibration isolator of the present invention has the above-mentioned structure, it is possible to form a long orifice and to optimize an elastic material for absorbing vibration and an elastic material for forming an elastic film, respectively. It has an excellent effect that it can be selected.

[Brief description of drawings]

FIG. 1 is a cross-sectional view (a cross-sectional view taken along line 1-1 of FIG. 2) perpendicular to an axis showing a vibration damping device according to a first embodiment of the present invention.

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

FIG. 3 is a perspective view of an elastic body before being incorporated into an outer cylinder.

FIG. 4 is a perspective view of a first resin inflow prevention cover.

FIG. 5 is a side view of a second resin inflow prevention cover.

6 is a sectional view taken along line 6-6 of the vibration damping device shown in FIG.

FIG. 7 is a perspective view of a restricted passage forming cover.

FIG. 8 is a perspective view of a restricted passage forming cover according to a second embodiment.

FIG. 9 is a cross-sectional view (a cross-sectional view taken along line 9-9 in FIG. 11) of the vibration isolator according to the second embodiment of the present invention, which is perpendicular to the axis.

FIG. 10 is a cross-sectional view (a cross-sectional view taken along line 10-10 of FIG. 11) of the vibration isolator according to the second embodiment of the present invention, which is perpendicular to the axis.

11 is a cross-sectional view taken along line 11-11 of the vibration damping device shown in FIG.

FIG. 12 is a perspective view of a second resin inflow prevention cover.

FIG. 13 is a perspective view of an elastic body of a vibration control device according to a third embodiment.

FIG. 14 is a cross-sectional view (a cross-sectional view taken along line 14-14 of FIG. 15) perpendicular to the axis of the vibration control device according to the third example.

15 is a cross-sectional view (cross-sectional view taken along line 15-15 of FIG. 14) taken along the axis of the vibration control device according to the third example.

[Explanation of symbols]

 10 Vibration Isolator 12 Outer Cylinder 14 Inner Cylinder Metal Fitting (Inner Cylinder) 16 Elastic Body 36L Diaphragm (Elastic Membrane) 36R Diaphragm (Elastic Membrane) 42 Main Liquid Chamber (Pressure Liquid Chamber) 44 First Sub Liquid Chamber 46 Second Sub Liquid Chamber 56 Restriction passage forming cover (plate member) 58 Wide groove (recessed portion) 60 Narrow groove (recessed portion) 62 Idle orifice (restricted passage) 64 Shake orifice (restricted passage) 108 Second resin inflow prevention cover (plate) -Shaped member) 114 Orifice (restricted passage) 116 Sub liquid chamber

Claims (2)

[Claims] 1. An outer cylinder connected to one of the vibration generating section and the vibration receiving section and integrally molded with resin, and connected to the other of the vibration generating section and the vibration receiving section and arranged inside the outer cylinder. An inner cylinder, an elastic body arranged between the outer cylinder and the inner cylinder so as to connect the outer cylinder and the inner cylinder, and at least a part of an inner wall is formed of the elastic body. A pressure receiving liquid chamber, a sub liquid chamber provided at a position separated from the pressure receiving liquid chamber in the circumferential direction, and a part of which is formed of an elastic film, and a limit connecting the pressure receiving liquid chamber and the sub liquid chamber. An anti-vibration device including: a passage, wherein the limiting passage is interposed between the elastic body and the outer cylinder and the elastic body, and is a plate-like member curved along an outer periphery of the elastic body. The recessed portion formed on at least one of the two is configured to be closed by the opposing partner, Sex film, vibration damping device, characterized in that said elastic member is provided separately to the plate-like member. 2. An outer cylinder connected to one of the vibration generating portion and the vibration receiving portion and integrally molded with resin, and connected to the other of the vibration generating portion and the vibration receiving portion and arranged inside the outer cylinder. An inner cylinder, an elastic body arranged between the outer cylinder and the inner cylinder so as to connect the outer cylinder and the inner cylinder, and at least a part of an inner wall is formed of the elastic body. A pressure receiving liquid chamber, a sub liquid chamber provided at a position separated from the pressure receiving liquid chamber in the circumferential direction, and a part of which is formed of an elastic film, and a limit connecting the pressure receiving liquid chamber and the sub liquid chamber. A vibration-damping device including: a passage; wherein the limiting passage is interposed between the outer cylinder and the elastic body and is curved along an outer periphery of the elastic body; The concave portion formed in at least one of the two plate-like members is closed by the other facing member. The elastic film, vibration damping device, characterized in that said elastic member is provided on at least one of separately said first plate-like member and the second plate-like member.