JP2001050331A - Vibration control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the need for a work to adhere together an outer cylinder material made of resin using an adhesive and an elastic body made of rubber and to intercouple the outer cylinder member and an elastic body through a simple work. SOLUTION: An insert fitment 36 situated along the inner peripheral surface of an outer cylinder 24 is provided with a pair of insert fixing parts 38 and 40. A pair of insert fixing parts 38 and 40 are embedded in the outer cylinder member 24. This constitution fixes the insert fitment 36 at the outer cylinder member 24 made of resin. An elastic body 16 made of rubber is vulcanized and adhered on the inner peripheral surface of the insert fitment 36 and the elastic body 16 is coupled to the outer cylinder member 24 through the insert fitment 36. The top surface of the elastic body 16 is vulcanized and adhered to the top plate 12 made of a metal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-vibration device which is applied to an automobile, a construction machine, a general industrial machine and the like, and suppresses transmission of vibration from a vibration generator such as an engine.

[0002]

2. Description of the Related Art For example, an anti-vibration device is provided between an engine serving as a vibration generating portion of a vehicle and a vehicle body serving as a vibration receiving portion. The anti-vibration device absorbs vibration generated by the engine. The structure is such that vibration transmitted to the vehicle body side is suppressed. As such a vibration damping device, for example, a rubber elastic body and a plurality of liquid chambers are provided inside the device,
It is known that these liquid chambers communicate with each other through a restriction passage serving as an orifice. Such a vibration isolator is provided with a vibration damping function of an elastic body and a viscous resistance of a liquid flowing through an orifice communicating between liquid chambers or liquid column resonance when vibration occurs due to operation of an automobile engine. And suppress vibration transmitted to the vehicle body.

In recent years, there has been a strong demand for a reduction in the number of parts and a reduction in the number of steps for assembly and a reduction in the weight of the vibration isolator as described above. The use of resin for machine parts has been studied. In addition, there has been developed an anti-vibration device in which an outer casing member is formed of resin and an outer casing member connected to one of the vibration generating unit and the vibration receiving unit is formed while forming an outer casing of the device.

[0004]

However, in the vibration isolator, when the outer cylinder member made of resin is used, the elastic body is molded simultaneously with the outer cylinder member when compared with the case where the outer cylinder member made of metal is used. Since vulcanization bonding to the member cannot be performed, an adhesive is applied to the elastic body or the outer cylindrical member, and the elastic body and the outer cylindrical member are bonded to each other via the adhesive. For this reason, in the vibration isolator using the resin outer cylinder member, the bonding operation between the elastic body and the outer cylinder member using an adhesive which is unnecessary if the outer cylinder member is made of metal in the manufacturing process is unnecessary. Occurs, and the cost increases due to the adhesive. As a result, the cost of the vibration isolator could not be sufficiently reduced even if the material of the outer cylinder member was changed to resin.

In view of the above facts, the present invention eliminates the need for an operation of bonding a resin outer cylinder member and a rubber elastic body using an adhesive, and makes the outer cylinder member and the elastic body simpler. It is an object of the present invention to provide a vibration isolator that can be connected by work.

[0006]

According to a first aspect of the present invention, there is provided an anti-vibration device, comprising: a mounting member connected to one of a vibration generating portion and a vibration receiving portion; A plurality of outer cylinder members connected to the other of the portions and an insert fixing portion having a diameter larger than the inner diameter of the outer cylinder member are provided along the axial direction, and the outer cylinder member is sandwiched by the plurality of insert fixing portions. And an insert fitting disposed along the inner peripheral surface of the outer tubular member, and a rubber elastic body connected to the mounting member and fixed to the insert fitting.

According to the vibration damping device having the above-described configuration, the insert fitting disposed along the inner peripheral surface of the outer cylindrical member has a plurality of insert fixing portions having a diameter larger than the inner diameter of the outer cylindrical member along the axial direction. The insert fitting clamps the outer cylindrical member by the plurality of insert fixing parts, so that the inner peripheral surface of the resin outer cylindrical member is covered by the insert fitting and the insert fitting is fixed to the outer cylinder by the plurality of insert fixing parts. Since the elastic member can be fixed to the member, the elastic member made of rubber can be fixed to the insert by vulcanization bonding, and the elastic member can be connected to the outer cylindrical member made of resin via the insert. Therefore, when molding the elastic body, if the insert fitting is inserted in advance into the mold for forming the elastic body, or if the insert fitting is a part of the mold for forming the elastic body, the raw material in the mold can be obtained. Since the elastic body can be vulcanized and bonded to the insert fitting simultaneously with the curing of the rubber, the elastic body can be connected to the outer cylinder member via the insert fitting.

[0008] Here, the insert fixing portion having a diameter larger than the inner diameter of the outer cylinder member is embedded in the outer cylinder member.
It may come into contact with the end of the outer cylinder member.

According to a second aspect of the present invention, there is provided the vibration isolator according to the first aspect, wherein the insert member has a radial movement of the mounting member supported on an inner peripheral side of the outer cylindrical member. A rubber stopper member for limiting the pressure is fixed.

According to the vibration isolator of the above construction, the stopper member made of rubber can be fixed to the insert fitting by vulcanization bonding. Therefore, when the stopper member is molded, the insert fitting is inserted into the mold for forming the stopper member. If the insert is previously inserted or if the insert is part of the mold, the stopper member can be vulcanized and bonded to the insert at the same time as the raw material rubber is hardened in the mold.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A vibration isolator according to an embodiment of the present invention will be described below with reference to the drawings.

(First Embodiment) FIGS. 1 and 2 show a vibration isolator 10 according to a first embodiment of the present invention. A center line is shown, and the following description is made with the direction along this center line as the axial direction of the apparatus.

At the upper end of the vibration isolator 10, a metal top plate 12 is arranged as shown in FIG. Top plate 12
A bolt shaft 14 for connecting the top plate 12 to an engine (not shown), which is a vibration generating unit, protrudes upward from the upper surface of the vehicle. An elastic body 1 made of rubber is provided on the lower surface of the top plate 12.
6 is vulcanized and bonded. The elastic body 16 has a truncated cone-shaped vibration absorbing portion 18 formed on the upper side, and a concave portion 20 that is depressed upward is formed in the center of the lower surface of the vibration absorbing portion 18. On the lower side of the elastic body 18, a thin cylindrical covering portion 22 extending downward from the lower end surface of the vibration absorbing portion 18 is integrally formed.

An outer cylindrical member 24 made of resin is arranged on the outer peripheral side of the covering portion 22 of the elastic body 16. The outer cylinder member 24 is formed in a substantially cylindrical shape with both axial end surfaces opened. A pair of flange portions 26 each extending in the radial direction are formed at the lower portion of the outer peripheral surface of the outer cylinder member 24. The pair of flange portions 26 are formed integrally with the outer cylinder member 24 by resin.

Each of the flange portions 26 has a substantially trapezoidal shape such that its width decreases toward the distal end when viewed from the axial direction. A metal insert ring 28 is embedded and fixed to each of the pair of flange portions 26 at the distal end side in the radial direction. A flange-shaped large-diameter portion 30 extending in the radial direction is formed on the outer peripheral surface of the insert ring 28, and the insert ring 28 is embedded in the flange portion 26 such that the upper and lower surfaces of the large-diameter portion 30 are covered with resin. Have been.

The insert ring 28 has a screw hole 32 penetrating in the axial direction. When the vibration isolator 10 is fixed to the vehicle body, which is a vibration receiving portion, the vibration isolator 10 is arranged such that the screw holes 32 of the flange portion 26 match the screw holes (not shown) of the vehicle body. After the 10 is positioned, fixing bolts (not shown) are screwed into the screw holes 32 and the screw holes on the vehicle body side, and the vibration isolator 10 is fixed to the vehicle body side. On the upper surface of the flange 26, a concave counterbore 3 around the screw hole 32 of the insert ring 28 is provided.
4 are formed, and the counterbore 34 has a screw hole 3
The head of the fixing bolt screwed into 2 is inserted.

A metal insert fitting 36 formed in a thin cylindrical shape is disposed on the inner peripheral side of the outer cylinder member 24. As shown in FIG. 3, the insert fitting 36 has a cylindrical isolating portion 3 having a constant radius of curvature at an axially middle portion.
7 are provided. The outer peripheral surface of the separating portion 37 is the same as that shown in FIG.
As shown in the figure, the outer cylindrical member 24 is in close contact with the inner peripheral surface.

At both ends in the axial direction of the insert fitting 36,
As shown in FIG. 3, flange-like insert fixing portions 38 and 40 extending in the radial direction are integrally formed. Of the insert fixing portions 38, 40, the upper insert fixing portion 38 is formed by bending the vicinity of the upper end portion of the insert fitting 36 toward the outer peripheral side, and the lower insert fixing portion 40 is formed of the insert fitting 36. The vicinity of the lower end portion is bent at a right angle to the outer peripheral side, and further folded toward the inner peripheral side, so that the vicinity of the lower end portion of the insert fitting 36 is double-folded.

As shown in FIG. 1, the insert fixing portion 38 has an outer diameter larger than the inner diameter near the upper end of the outer cylinder member 24, and the insert fixing portion 40 has a larger inner diameter than the lower end of the outer cylinder member 24. Has a large outer diameter. The length of the insert fitting 36 along the axial direction is shorter than the length of the outer tubular member 24. The insert metal fitting 36 embeds the outer peripheral end of the insert fixing portion 38 inside the outer cylindrical member 24, and inserts the outer peripheral end of the insert fixing portion 40 into the outer cylindrical member 2.
4 is buried inside. Therefore, the insert fitting 36
The pair of insert fixing portions 38 and 40 sandwich the peripheral wall portion of the outer cylindrical member 24 along the axial direction. As a result, the insert metal fitting 36 is axially
Fixed to.

Further, since the insert fitting 36 and the outer cylinder member 24 are pressure-bonded to each other without any gap, the insert fitting 3
6 is fixed to the outer cylinder member 24 also in the circumferential direction around the center line O by frictional force.
A part along the circumferential direction of No. 6 may be made non-circular to further increase the fixing strength in the circumferential direction.

The insert fitting 36 is integrally provided with a cylindrical caulking member 42 extending downward from the lower end of the insert fixing portion 40 as shown in FIG. The inner diameter of the caulking member 42 is larger than the inner diameter of the separating part 37 of the insert fixing part 40 and smaller than the outer diameter of the insert fixing part 40. Thus, a step 44 is formed in the insert fitting 36 along the boundary between the insert fitting 40 and the caulking member 42.

As shown in FIG. 1, the lower side of the elastic body 16 is vulcanized and bonded to the inner peripheral surface of the insert fitting 36. The elastic body 16 is vulcanized and bonded to the insert metal fitting 36 at the lower end of the outer peripheral surface of the vibration absorbing portion 18 to the inner peripheral portion of the insert fixing portion 38 and the upper side of the inner peripheral surface of the isolation portion 37. It is vulcanized and adhered so as to cover the lower part of the inner peripheral surface of the isolation part 37.

As shown in FIG. 1, a partition member 46 made of resin is arranged in the outer cylinder member 24. The partition member 46 is formed in a disk shape.
A partition wall 48 having an outer diameter substantially equal to the inner diameter of the covering portion 22 of the elastic body 16 is provided on the upper side, and the caulking member 4 is provided on the lower side.
A flange portion 50 having an outer diameter substantially equal to the inner diameter of the second 2 is provided. The partition member 46 makes the upper surface of the flange portion 50 abut on the step portion 44 of the insert fitting 36. As a result, the partition member 46 is axially inserted into the insert fitting 3.
6 is positioned.

The partition wall member 46 inserts the partition wall portion 48 into the separating portion 37 of the insert fitting 36, and abuts the outer peripheral portion of the upper surface of the partition wall portion 48 with the outer peripheral portion of the lower surface of the vibration absorbing portion 18 of the elastic body 16 over the entire circumference. Let me. Accordingly, a space partitioned from the outside between the vibration absorbing portion 18 of the elastic body 16 and the partition wall portion 38 is formed in the insert fitting 36, and this space is a main liquid chamber 52 in which liquid is filled and sealed. ing.

The outer peripheral surface of the partition wall portion 48 is
6 is in close contact with the insert fitting 36 via the covering portion 22, and a groove 5 having a rectangular cross section is formed on the outer peripheral surface of the partition 48.
4 are formed over substantially one round. This groove 54
As shown in FIG. 1, together with the inner peripheral surface of the covering portion 22, a restricting passage 56 that communicates the main liquid 52 and a sub liquid chamber described later is formed. Here, the main liquid chamber 5 is provided at one end of the groove 54.
A through-hole 58 connected to the sub-liquid chamber is formed at the other end of the groove 52.

A circular recess 62 is formed at the center of the lower surface of the partition member 46. Below the concave portion 62, a diaphragm 6 formed of a thin rubber film is provided.
4 is disposed, and the diaphragm 64 is provided with a concave portion 62.
The lower opening is closed. Thereby, the concave portion 62
A space partitioned from the outside is formed inside the space, and this space is filled and sealed with a liquid, and serves as a sub liquid chamber 65 which communicates with the main liquid chamber 52 through a restriction passage 56.

As shown in FIG. 2, a fitting portion 66 which is thicker than the central portion is formed on the outer periphery of the diaphragm 64 over the entire periphery. A fitting groove 68 corresponding to the fitting portion 66 is formed on the outer peripheral side of 62. The fitting portion 66 of the diaphragm 54 is fitted in the fitting groove 68. The central portion of the diaphragm 54 projects into the concave portion 62 of the partition member 46,
It is curved along the inner surface of the recess 62.

At the lower part of the diaphragm 54, a thin lid member 72 is arranged as shown in FIG. An air chamber 74 formed in a cup shape is formed at the center of the lid member 72, and the opening of the air chamber 74 faces the center of the diaphragm 54. Thus, the air chamber 74 allows the diaphragm 54 to be elastically deformable to the outside of the recess 62. A disk-shaped flange portion 76 is formed on the outer peripheral portion of the lid member 72. The furan portion 76 is in close contact with the outer peripheral portion of the lower surface of the partition member 46, and the diaphragm 54 is sandwiched between the partition member 46 and the fitting groove 68 with the fitting portion 66 interposed therebetween.
Is fixed.

The caulking member 42 provided integrally with the insert fitting 36 is formed into a cylindrical shape as shown in FIG. 2 before assembling the device, but has a lower side at the time of assembling the device as shown in FIG. It is crimped to the inner peripheral side and closely adheres to the lower surface of the flange portion 76 of the lid member 72. Thereby, the partition member 4
6. The diaphragm 54 and the lid member 72 are fixed to the insert fitting 36.

Next, a method of manufacturing the elastic member 16 and the outer cylindrical member 24 according to the present embodiment configured as described above will be described.

When the elastic body 16 is manufactured, the top plate 12 and the insert fitting 36 are set at predetermined positions in an elastic body molding mold (not shown) in which a cavity corresponding to the shape of the elastic body 16 is formed. Into the mold, a raw rubber which is in a molten state and to which a vulcanizing agent such as sulfur is added is injected. When the raw rubber in the mold is cooled and hardened, the molding of the elastic body 16 is completed, and at the same time, the vulcanization bonding of the elastic body 16 to the top plate 12 and the insert fitting 36 is also completed.

Here, as the raw rubber, for example, NR
(Natural rubber), NBR (nitrile butadiene rubber) and the like can be used. Note that a thin rubber film may be extended from the outer peripheral surface of the vibration absorbing portion 18 of the elastic body 16 and the outer peripheral surface of the insert fitting 36 may be covered with the rubber film.

When the outer cylinder member 24 is manufactured, the insert fitting 36 is placed at a predetermined position in an outer cylinder member molding mold (not shown) in which a cavity corresponding to the shape of the outer cylinder member 24 and the flange 26 is formed. Set.
A resin in a molten state is injected into the mold. When the molten resin in the mold is cooled and hardened, the molding of the outer tubular member 24 and the flange 26 is completed. At this time, the insert fitting 36 is
4 becomes a core at the time of molding, and the insert fitting 36 has a state in which the outer peripheral surface is filled with a cured resin, and the insert fitting 36 has a pair of insert fixing portions 3.
Reference numerals 8 and 40 are embedded (inserted) from the inner peripheral side of the outer cylindrical member 24 into the peripheral wall portion. In addition, the insert ring 28 and the insert ring 28
Is also set, and the insert ring 28 is
Buried inside.

Here, the outer cylinder member 24 and the flange 26
As a resin to be a material of, for example, polyamide resin,
Polyacetal, polycarbonate, polyimide and the like can be used.

Next, the operation of the vibration isolator 10 according to this embodiment will be described.

In the vibration isolator 10 of this embodiment, the vibration from the engine is transmitted through the top plate 12 to the vibration absorbing portion 18 of the elastic body 16.
When transmitted to the vibration absorber 18, the vibration absorber 18 acts as a vibration absorber,
Vibration is absorbed by a vibration damping function based on internal friction caused by elastic deformation of the vibration absorbing portion 18. Further, the main liquid chamber 52 expands and contracts due to the elastic deformation of the vibration absorbing portion 18 of the elastic body 16, and the diaphragm 64 constituting the partition of the sub liquid chamber 65 elastically deforms, and the liquid in the main liquid chamber 52 and the sub liquid chamber 65. Flow through each other through the restriction passage 56, and the vibration from the engine is effective due to the damping action based on the pressure change of the liquid generated in the orifice space formed by the restriction passage 56, the viscous resistance of the liquid flow, the liquid column resonance, and the like. Is absorbed by

According to the vibration isolator 10 according to the present embodiment described above, the insert fitting 36 disposed along the inner peripheral surface of the outer tubular member 24 has a diameter larger than the inner diameter of the outer tubular member 24. A pair of insert fixing portions 38 and 40 are provided,
A pair of insert fixing portions 38, 4 of the insert fitting 36
0 is embedded in the outer cylinder member 24, so that the insert fitting 36 covers the inner peripheral surface of the resin outer cylinder member 24, and the pair of insert fixing portions 38, 40 allows the insert fitting 36 to be inserted into the outer cylinder member 24. Since the elastic member 16 can be fixed to the member 24, the elastic member 16 made of rubber is fixed to the insert fitting 36 by vulcanization bonding, and the elastic body 16 can be connected to the outer cylindrical member 24 made of resin via the insert fitting 36. Therefore, when the elastic body 16 is molded by inserting the insert fitting 36 into the elastic body forming mold in advance as described above, the elastic body 16 is inserted into the insert fitting simultaneously with the curing of the raw material rubber in the mold. Since the elastic body 16 can be vulcanized and bonded to the outer cylinder member 24 via the insert fitting 36.

Since the liquid in the liquid chambers 52 and 68 is isolated from the outer cylinder member 24 by the isolation portion 37 of the insert fitting 36, liquid such as water, oil, and ethylene glycol is transferred to the outer cylinder member 24 made of resin. Swelling or the like of the resin outer cylinder member 24 due to long-term contact with the liquid without direct contact is prevented.

In the vibration isolator 10 according to the present embodiment, the pair of insert fixing portions 3
Although the description has been given only of the case in which the insert fittings 8 and 40 are provided, a plurality of insert fixing portions of the insert fitting 36 may be provided in the axial direction, and one or more insert fixing portions are provided in the intermediate portions of the insert fixing portions 38 and 40. A fixing portion may be additionally provided.

(Second Embodiment) FIGS. 4 and 5 show:
An embodiment in which the present invention is applied to a so-called bush type vibration damping device 80 is shown. Note that the symbol O in the figure
Indicates the center line of the apparatus, and the following description will be made with the direction along this center line as the axial direction of the apparatus.

As shown in FIG. 4, the vibration isolator 80 has an outer cylindrical member 82 having a thick cylindrical shape. The outer cylinder member 82 is formed of resin, and is connected to the vehicle body side, which is a vibration receiving unit, via a connection fitting (not shown) inserted into the outer peripheral surface of the outer cylinder member 82. A pipe-shaped mounting member 84 is arranged on the inner peripheral side of the outer cylinder member 82 in a parallel axis manner. The mounting bracket 84 is formed of metal, and is connected to the engine side, which is a vibration generating unit, via a connecting shaft (not shown) passing through the inner peripheral side.

Between the outer cylinder member 82 and the mounting bracket 84,
An elastic body 86 is arranged as shown in FIG. The elastic body 86 is formed in a substantially V-shape that opens downward as viewed from the axial direction. At the center of the elastic body 86, a circular insertion hole 88 having a circular cross-section penetrates in the axial direction. The insertion hole 88 is inserted into the outer peripheral surface of the mounting bracket 84, and the inner peripheral surface thereof is attached to the mounting bracket 84. Is vulcanized and bonded to the outer peripheral surface. Thereby, the elastic body 86 is fixed to the mounting bracket 84. The elastic body 86 is formed with a pair of connecting portions 90 extending radially about the mounting bracket 84. These connecting portions 90 are fixed to metal insert fittings 92 arranged on the inner peripheral side of the outer cylindrical member 82, respectively.

The insert fitting 92 is formed in a thin cylindrical shape as shown in FIG. Insert fitting 92
Is provided with a cylindrical intermediate cylindrical portion 94 at an intermediate portion in the axial direction, and a distal end surface of a connecting portion 90 of the elastic body 86 is vulcanized and bonded to an inner peripheral surface of the intermediate cylindrical portion 94. The outer peripheral surface of the intermediate cylindrical portion 94 is pressed against the inner peripheral surface of the outer cylindrical member 82.

At both ends in the axial direction of the insert fitting 92,
As shown in FIG. 5, insert fixing portions 96 are respectively formed. These insert fixing portions 96 include a flange portion 98 extending from the axial end of the intermediate cylindrical portion 94 to the outer peripheral side, and a cylindrical portion 100 extending axially outward from the extending end of the flange portion 98. I have. Cylindrical part 100
Has an outer diameter larger than the inner diameter of the outer cylindrical member 82 as shown in FIG.
Are embedded in the outer cylinder member 82 from the inner peripheral surface side. Therefore, the insert fitting 92 sandwiches the peripheral wall portion of the outer cylindrical member 82 along the axial direction by the pair of insert fixing portions 96. Thereby, the insert fitting 92 is fixed to the outer cylinder member 82 in the axial direction.

Further, since the insert fitting 92 and the outer cylinder member 82 are pressure-bonded to each other without any gap, the insert fitting 9
2 is fixed to the outer cylinder member 82 also in the circumferential direction around the center line O by frictional force.
The fixing strength in the circumferential direction may be further increased by making a part along the circumferential direction of No. 2 non-circular.

The elastic body 86 is connected to the outer cylinder member 82 via an insert metal fitting 92, and the elastic body 86 has a mounting metal fitting 84 formed in the outer cylindrical member 82 in a parallel axis as shown in FIG. I support it. The mounting bracket 84 is connected to an engine side, which is a vibration generating unit, via a connecting shaft (not shown) that penetrates an inner peripheral portion thereof. Thereby, the mounting bracket 8
4 is input with the vibration from the engine and the load due to the engine's own weight. At this time, a load due to the engine's own weight acts on the mounting member 84 and the connecting portion 90 of the elastic body 86 is elastically deformed, so that the mounting member 84 is held at a position substantially coaxial with the outer cylinder member 82. .

A rubber stopper member 102 is vulcanized and bonded to the inner peripheral surface of the insert fitting 92 as shown in FIG. The stopper member 102 is arranged above the mounting bracket 84 along the radial direction with respect to the center line O.
Thereby, when an excessive load is input from the engine side and the mounting bracket 84 rebounds upward, the mounting bracket 84
The upper surface contacts the stopper member 102 via the elastic body 86, and the upward movement is restricted.

Next, a method of manufacturing the elastic body 86, the stopper member 102, and the outer cylinder member 82 according to the present embodiment having the above-described configuration will be described.

At the time of manufacturing the elastic body 86, the mounting bracket 84 is placed at a predetermined position in an elastic body molding mold (not shown) in which a cavity corresponding to the shape of the elastic body 86 is formed.
And the insert fitting 92 are set. Into the mold, a raw rubber which is in a molten state and to which a vulcanizing agent such as sulfur is added is injected. When the raw rubber in the mold is cooled and hardened, the molding of the elastic body 86 is completed, and at the same time, the vulcanization bonding of the elastic body 86 to the mounting bracket 84 and the insert fitting 92 is also completed.

The stopper member 102 is formed by injecting a raw rubber containing a vulcanizing agent into a stopper member molding mold (not shown) that is in close contact with the inner peripheral surface of the insert fitting 92. It is molded and vulcanized to the insert fitting 92. The stopper member 102
It is also possible to provide a connecting portion to the elastic body 86 and to form the stopper member 102 and the elastic body 86 simultaneously with a common mold.

When the outer cylinder member 82 is manufactured, the insert fitting 92 is set at a predetermined position in an outer cylinder member molding mold (not shown) in which a cavity corresponding to the shape of the outer cylinder member 82 is formed. A resin in a molten state is injected into the mold. As the molten resin in the mold cools and hardens, the outer cylindrical member 82
Is completed. At this time, the insert fitting 92 becomes a core when the outer cylindrical member 82 is molded. As a result, the insert fitting 82 is in a state where the outer peripheral surface is filled with the cured resin, and the insert fitting 8 is formed.
The two pairs of insert fixing portions 96 are embedded (inserted) from the inner peripheral side of the outer cylindrical member 82 into the peripheral wall portion.

Next, the operation of the vibration isolator 80 according to this embodiment will be described.

In the vibration isolator 80 of this embodiment, when the vibration from the engine is transmitted to the elastic body 86 via the mounting bracket 84, the elastic body 86 acts as a vibration absorbing main body, and mainly the connecting portion 90 is elastically deformed. Vibration is absorbed by a vibration damping function based on internal friction when performing. At this time, by appropriately adjusting the thickness of the connecting portion 90 along the circumferential direction of the elastic body 86 and the inclination angle of the connecting portion 90 with respect to the horizontal direction, the spring constant of the elastic body 86 in the vertical direction and the spring constant in the horizontal direction are adjusted. The magnitude of the constant and the ratio of their spring constants can be set corresponding to the input vibration, and the vibration from the engine can be effectively attenuated.

According to the vibration isolator 80 according to this embodiment described above, the same effect as that of the vibration isolator 10 according to the first embodiment can be obtained, and the stopper member 1 made of rubber can be obtained.
02 can be fixed to the insert fitting 92 by vulcanization bonding. Therefore, if the insert fitting 92 is a part of the mold when the stopper member 102 is molded, the stopper member 102 is inserted simultaneously with the curing of the raw material rubber in the mold. Vulcanization bonding to the metal fitting 92 is possible. Therefore, the stopper member 102 can be fixed to the insert fitting 92 without performing the bonding operation with the adhesive.

[0055]

As described above, according to the vibration damping device of the present invention, the work of bonding the resin outer cylinder member and the rubber elastic body using the adhesive can be eliminated, and the outer cylinder member can be eliminated. And the elastic body can be connected by a simple operation.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view along the axial direction showing a configuration of a vibration isolator according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a state where the vibration isolator according to the first embodiment of the present invention is disassembled along the axial direction.

FIG. 3 is a perspective view showing an insert fitting and a caulking member in the vibration isolator according to the first embodiment of the present invention.

FIG. 4 is a front view of an anti-vibration device according to a second embodiment of the present invention as viewed from an axial direction.

FIG. 5 is an axial sectional view showing a configuration of a vibration isolator according to a second embodiment of the present invention.

FIG. 6 is a perspective view showing a state where an elastic body and a stopper member are fixed to an insert fitting in a vibration isolator according to a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Vibration isolator 12 Top plate (attachment member) 14 Bolt shaft (attachment member) 16 Elastic body 24 Outer cylinder member 20 Support cylinder (second attachment member) 36 Insert fitting 38 Insert fixing portion 40 Insert fixing portion 80 Vibration isolating device 82 Outer cylinder member 84 Mounting bracket (mounting member) 92 Insert bracket 86 Elastic body 96 Insert fixing part 102 Stopper member

Claims (2)

[Claims] A mounting member connected to one of the vibration generating portion and the vibration receiving portion; an outer cylindrical member formed of resin in a cylindrical shape and connected to the other of the vibration generating portion and the vibration receiving portion; A plurality of insert fixing portions having a diameter larger than the inner diameter of the cylindrical member are provided along the axial direction, and the outer cylindrical member is sandwiched by the plurality of insert fixing portions and arranged along the inner peripheral surface of the outer cylindrical member. And a rubber elastic body connected to the mounting member and fixed to the insert fitting. 2. A rubber stopper member for restricting a radial movement of the mounting member supported on an inner peripheral side of the outer cylindrical member is fixed to the insert fitting. Item 4. The vibration isolator according to Item 1.