JP2000220687A - Vibration control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a stopper member and an outer cylindrical member from being deformed due to pressing force applied to the caulking part of the outer cylindrical member when the stopper member is to be caulked and fixed to the outer cylindrical member. SOLUTION: When a stopper fitting 40 is to be fixed to the upper end of an outer cylindrical fitting 20, the resting of the flange part 42 of the stopper fitting 40 onto the resting part 22 of the outer cylindrical fitting 20 thereby allows the support reinforcing part 21 of the outer cylindrical fitting 20 to abut against the inner circumferential surface at the opening end part of the stopper fitting 40. This constitution thereby allows the movement of the stopper fitting 40 to a place close to the opening end and the upper circumferential side of the flange part 42 to be checked by the support reinforcing part 21 of the outer cylindrical fitting 20 when pressing force is applied to the caulking part 25 of the outer cylindrical fitting 20 so as to allow the caulking part to be plastically deformed to the inner circumferential side in such a way as to let the flange part 42 be held.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used as an engine mount for general industrial machines and automobiles, and absorbs vibration from a vibration generator such as an engine to suppress transmission of vibration to a vibration receiver such as a vehicle body. The present invention relates to a vibration isolator.

[0002]

2. Description of the Related Art For example, an anti-vibration device as an engine mount 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 generates an engine. Absorbs vibration and suppresses transmission of vibration to the vehicle body. As such an anti-vibration device, there is known a liquid-sealed type in which an elastic body and a pair of liquid chambers are provided inside the anti-vibration device, and these liquid chambers communicate with each other through a restricted passage serving as an orifice. . According to the liquid filled type vibration damping device, when the mounted engine is operated and vibration is generated, the vibration damping function of the elastic body and the viscous resistance of the liquid in the orifice communicating between the pair of liquid chambers. Vibration is absorbed by, for example, and the transmission of vibration to the vehicle body is suppressed.

FIG. 7 shows a conventional liquid filled type vibration damping device 11.
0 is shown. As shown in this figure, a rubber elastic body 118 is disposed between the inner cylindrical fitting 120 and the upper mounting fitting 116 by being vulcanized and bonded to these fittings.
Further, the inner cylinder fitting 120 is inserted into the outer cylinder fitting 114,
The stopper fitting 112 is caulked to the outer cylinder fitting 114. Diaphragm 122 arranged in inner cylinder fitting 120
A liquid chamber 124 is provided between the elastic member 118 and the elastic member 118. A partition member 130 is provided in the liquid chamber 124. The partition member 130 divides the liquid chamber 124 into a pair of small liquid chambers 124A and 124B.
It has an orifice 132 communicating with 124B. In this vibration isolator 110, the orifice 132
The liquids in the small liquid chambers 124A and 124B circulate through each other, and the vibration is absorbed by the viscous resistance of the liquid.

At the time of assembling the vibration isolator 110, the inner cylinder 120, the mounting bracket 116, and the elastic body 118, which have been assembled in advance, are inserted into the outer cylinder 114, and then the outer cylinder 114 is assembled. The stopper fitting 112 is placed thereon, and the cylindrical caulking portion 112A formed at the lower end of the stopper fitting 112 is bent toward the inner peripheral side.
The stopper metal 112 is caulked and fixed to the outer cylinder metal 114 by clamping the flange 114A formed at the upper end of the 14 with the caulking part 112A.

[0005]

However, in the above-described vibration isolator 110, the stopper fitting 112 is connected to the outer cylinder fitting 11.
4, when the pressing force F is applied to the caulking portion 112A of the stopper fitting 112 from the outer peripheral side to bend the caulking portion 112A to the inner peripheral side as shown in FIG.
At the same time as the deformation of the caulking portion 112A proceeds, the pressing force F
Is transmitted to the vicinity of the lower end of the stopper fitting 112 with the vicinity of the extension end of the flange 114A as a point of force, and is also transmitted to the vicinity of the upper end of the outer tube fitting 114 via the flange 114A. Thereby, the stopper fitting 112
Local deformation occurs near the lower end of the outer metal fitting or near the upper end of the outer metal fitting 114, or the stopper metal 112 or the outer cylindrical metal 1
14 was sometimes distorted. For this reason, in the conventional anti-vibration device 110, for example, the caulking operation when bending the caulking portion 112A inward is performed in a plurality of times,
The pressing force applied to the caulking portion 112A by one caulking operation is reduced, and the direction of the pressing force is adjusted for each caulking operation, so that the stopper fitting 112 and the outer cylinder fitting 11 are formed.
4 was prevented from being deformed.

In view of the above facts, the present invention prevents deformation of the stopper member and the outer cylinder member even when a large pressing force is applied to the caulked portion of the outer cylinder member when the stopper member is caulked and fixed to the outer cylinder member. It is an object of the present invention to provide a vibration isolator that can be used.

[0007]

According to a first aspect of the present invention, there is provided an anti-vibration device, comprising: a first mounting member connected to one of a vibration generating portion and a vibration receiving portion; a second mounting member; An elastic body disposed between the mounting member and the second mounting member; and a cylindrical outer cylindrical member connected to the other of the vibration generating unit and the vibration receiving unit, and into which the second mounting member is inserted and fixed. An arcuate shape which is fixed to the outer cylinder member and faces the first mounting member, restricts relative displacement of the first mounting member with respect to the second mounting member, and opens the outer cylinder member side. A stopper member having a cross section of
The stopper member has a flange portion extending outwardly along an opening end on the outer cylinder member side, and the outer cylinder member is formed along an opening end on the stopper member side. A mounting portion on which the flange portion is mounted, and a plate-shaped caulking portion formed along the outer peripheral end of the mounting portion and plastically deformed inward to sandwich the flange portion on the mounting portion; And a support reinforcing portion formed along the inner peripheral end of the placing portion and abutting against the inner peripheral surface of the stopper member.

According to the vibration damping device having the above-described structure, the support reinforcing portion formed along the inner peripheral end of the mounting portion is provided with the stopper member in a state where the flange portion of the stopper member is mounted on the mounting portion. By applying a pressing force from the outer peripheral side to the caulking portion of the outer cylinder member by abutting against the inner peripheral surface of the outer cylindrical member, when the caulking portion is plastically deformed to the inner peripheral side so as to sandwich the flange portion on the mounting portion ,
Even if the pressing force is transmitted to the flange via the caulking part,
Since the movement of the stopper member near the opening end and the inner peripheral side of the flange portion is prevented by the support reinforcing portion of the outer cylinder member, the pressing force transmitted through the flange portion causes the vicinity of the opening end of the stopper member and the flange. The part does not deform.
Further, since the vicinity of the opening end of the outer cylinder member is reinforced by the support reinforcing portion, the strength near the opening end of the outer cylinder member can be improved, and the deformation of the outer cylinder member can be prevented.

As a result, if the strength of the support reinforcing portion of the outer cylinder member is sufficiently increased with respect to the strength of the caulking portion, even when a large pressing force is applied to the caulking portion when the stopper member is caulked and fixed to the outer cylinder member. In addition, local deformation and distortion of the stopper member and the outer cylinder member due to the pressing force can be reliably prevented.

According to a second aspect of the present invention, in the vibration isolator according to the first aspect, the support reinforcing portion is formed of a two-layer plate-like piece formed by folding an open end of the outer cylindrical member. It becomes.

According to the vibration damping device having the above structure, the outer end of the outer cylindrical member made of a material capable of plastic working, such as a metal plate, is folded back so as to extend along the inner peripheral end of the mounting portion of the outer cylindrical member. Since the support reinforcement portion can be formed by using the support member, a high-strength support reinforcement portion can be formed only by a simple working operation such as press working on the outer cylindrical member without increasing the number of parts.

[0012]

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.

(Structure of Embodiment) FIGS. 1 to 6 show a vibration isolator 10 according to an embodiment of the present invention. In addition,
The symbol L in the figure indicates the axis which is the center of the apparatus, and the following description will be made with the direction along this axis L as the axial direction of the apparatus.

As shown in FIG. 1, the vibration isolator 10 has a thin cylindrical inner cylinder fitting 12 as a first mounting member. The upper cylindrical portion 1 having different diameters from each other
4 and a lower cylindrical portion 16 are formed.
4 has a slightly larger diameter than the lower cylindrical portion 16. The inner cylindrical fitting 12 has a constricted portion 15 having a diameter smaller than that of the lower cylindrical portion 16 at an intermediate portion between the cylindrical portions 14 and 16. A reduced diameter portion 16 </ b> A is formed at the lower end of the inner cylindrical fitting 12 to reduce the diameter in a tapered shape. In addition, a thin ring-shaped flange portion 18 slightly extending in the radial direction from the upper end of the upper cylindrical portion 14 is formed at an upper end portion of the inner cylindrical fitting 12, and a lower end portion of the lower cylindrical portion 16 is tapered. A reduced diameter portion 16A for reducing the diameter is formed.

As shown in FIG. 2, the inner cylindrical fitting 12 is press-fitted into an outer cylindrical fitting 20 formed in a cup shape.
The outer tube fitting 20 is formed by forming a thin metal plate such as a stainless steel plate into a bottomed cylindrical shape whose upper side is opened by pressing or the like, and corresponds to the outer diameter of the cylindrical portions 14 and 16. The inner diameter is slightly larger than the inner diameter on the lower side.

As shown in FIG. 1, a support reinforcing portion 18 is formed on the outer cylindrical fitting 20 along an opening end thereof. The support reinforcing portion 21 folds the metal plate forming the outer cylinder 20 from the open end of the outer cylinder 20 to the outer peripheral side, so that the inner peripheral surface of the folded metal plate contacts the outer peripheral surface of the outer cylinder 20. A metal plate is stacked in two layers, and is formed over the entire periphery of the open end of the outer cylinder fitting 20. The height of the support reinforcing portion 21 in the axial direction is sufficiently longer than the thickness of the flange portion 42 of the stopper fitting 40 described later. As shown in FIG. 2, the flange portion 18 of the inner cylindrical fitting 12 pressed into the outer cylindrical fitting 20 is placed on the upper end of the support reinforcing section 21.

At the lower end of the support reinforcing portion 21, a ring-shaped mounting portion 22 extending in the radial direction is formed as shown in FIG. Further, a crimping portion 24 that is bent upward along the extending end of the mounting portion 22 is formed in the outer cylinder fitting 20. Accordingly, the support reinforcing portion 21, the mounting portion 22, and the caulking portion 24 have a substantially U-shaped cross-sectional shape along the radial direction that opens upward.

Here, as shown in FIG.
The caulked portion 24 is not formed at a part of the second extended end, and the caulked portion 24 has a substantially C-shaped cross section in the direction perpendicular to the axis.

As shown in FIG. 4, a pair of leg portions 28 are fixed to the outer peripheral surface of the outer tube fitting 20 by welding or the like. The leg portion 28 has a plate-like fixing portion 2 which is curved along the outer peripheral surface of the outer cylinder fitting 20 on the base end side fixed to the outer cylinder fitting 20.
8A are formed, and flat mounting portions 28B each having a different inclination angle are formed on the distal end sides of the pair of leg portions 28 so as to correspond to the shape of the vehicle body-side mounting surface. Both ends of the fixing portion 28A and the mounting portion 28B are connected by a pair of flat connecting portions 28C, and the pair of connecting portions 28C support the mounting portion 28B obliquely downward on the outer peripheral side of the outer cylindrical fitting 20. ing. Further, a through hole 28D for inserting a bolt is formed in the mounting portion 28B. When attaching the vibration isolator 10 to the vehicle body side, the through hole 2
A fastening bolt is inserted into 8D, and the bolt is screwed into a screw hole formed in the mounting surface until a specified fastening torque is generated, whereby the vibration isolator 10 is fastened and fixed to the vehicle body side.

As shown in FIG. 1, an outer peripheral surface of a rubber elastic body 30 formed in a substantially cylindrical shape is vulcanized and bonded to the inner peripheral surface of the inner cylinder fitting 12. The elastic body 30 is provided with a thin-film partition wall portion 30A that partitions the inside of the hollow portion into an upper side and a lower side at an axially intermediate portion. A substantially truncated conical recess 30B is formed on the upper side of the partition 30A, and a mounting bracket 32 having an outer shape corresponding to the recess 30B is embedded and vulcanized and bonded in the recess 30B.

The elastic body 30 has a thick portion 30C on the upper side which is bridged between the inner peripheral surface of the inner cylindrical fitting 12 and the outer peripheral surface of the mounting member 20, and the thick portion 30C is formed with an axial center L. Is a substantially C-shape that opens downward. The upper side of the thick portion 30C protrudes upward from the upper end of the inner cylindrical fitting 12. Further, the elastic body 30 has a thin cylindrical covering portion 30D on the lower side of the thick portion 30C. The covering portion 30D extends downward from the lower end surface of the thick portion 30C and extends downward. The lower part of the inner peripheral surface is covered.

On the mounting portion 22 of the outer tube fitting 20, FIG.
As shown in FIG. 4, a rubber stopper piece 35 integrally formed with the elastic body 30 is vulcanized and bonded. Stopper piece 3
Numeral 5 is arranged at the center of a region sandwiched between both ends of the caulking portion 24 on the mounting portion 22, and has a substantially trapezoidal cross section along the axial direction.

The upper end of the mounting bracket 32 projects from the upper surface of the elastic body 30, as shown in FIG. Mounting bracket 3
2, a female screw hole 32A is formed along the axis L, and a locking pin 34 protruding upward is provided on the outer peripheral side of the female screw hole 20A.

On the top surface of the mounting bracket 32, the mounting bracket 32
Arm bracket 36 together with the first mounting member
Is arranged. As shown in FIG. 6, the arm bracket 36 extends radially outward from the axial center L as viewed in the axial direction, and slightly extends in the tangential direction near the outer peripheral end of the mounting portion 22. Are bent in a substantially letter shape. The arm bracket 36 has a rectangular cross section along the tangential direction. Arm bracket 36
The intermediate portion in the radial direction passes right above the stopper piece 36 arranged on the mounting portion 22.

At the base end of the arm bracket 36, FIG.
As shown in the figure, a small-diameter through hole 36A is formed on the lower surface side and a large-diameter counterbore portion 36B is formed coaxially on the upper surface side,
The through hole 36A and the counterbore 36B penetrate the base end of the arm bracket 36 along the axis L. A fastening bolt 41 is inserted into the through hole 36A and the counterbore 36B from the upper surface side.
1A is screwed into the female screw hole 32A of the mounting bracket 32. At this time, the bolt 41 is screwed into the female screw hole 32A until the washer-integrated bolt head 41B is pressed against the bottom surface of the counterbore portion 36B with a predetermined pressure. Thereby, as shown in FIG. 2, the base end of the arm bracket 36 is fixed on the top surface of the mounting bracket 32, and the arm bracket 36
Is supported in a cantilevered state by the mounting bracket 32.

On the lower surface of the base end of the arm bracket 36,
The fitting hole 3 corresponding to the locking pin 34 as shown in FIG.
When the arm bracket 36 is fixed on the mounting bracket 32, the locking pin 34 is fitted into the fitting hole 36C. As a result, the mounting bracket 32 and the arm bracket 36 are connected with high strength so as to always rotate integrally about the axis L. A pair of female screw holes 36D penetrating in the axial direction is formed at the tip of the arm bracket 36 as shown in FIG.
The pair of female screw holes 36D has an arm bracket 36
A pair of bolts (not shown) for connecting to the engine side are screwed in. Therefore, when the arm bracket 36 is connected to the engine side, the mounting bracket 32 is connected to the engine side, which is a vibration generating unit, via the arm bracket 36.

The base end of the arm bracket 36 fixed on the mounting bracket 32 is covered with a rubber cover member 38 shown in FIG. The cover member 38 is crimped to a portion of the base end of the arm bracket 36 other than the portion in contact with the upper surface of the mounting bracket 32. Thus, since the arm bracket 36 does not directly contact a stopper fitting described later, the generation of a collision sound between the arm bracket 36 and the stopper fitting is prevented.

As shown in FIG. 2, a stopper metal fitting 40 is fixed above the outer cylindrical metal fitting 20 so as to face the arm bracket 36 constituting a part of the first mounting member. The stopper fitting 40 has a side wall portion 40A curved in a U-shape as shown in FIG. 5 and a top plate portion 40B for closing an upper end side of the side wall portion 40A. The top plate 40B is integrally formed of a thin metal plate. The stopper fitting 40 is installed in such a direction that the extension direction side of the arm bracket 36 becomes an opening end. The opening fitting part on the side surface side of the stopper fitting 40 extends in the extension direction of the arm bracket 36. A reinforcing rib 40C bent in an L-shaped cross section is formed so as to increase the opening area.

As shown in FIG. 4, a fixing flange portion 4 which is bent at substantially right angles from the lower end of the side wall portion 40A and extends to the outer peripheral side is provided at the lower open end of the stopper fitting 40.
2 are formed. Here, the stopper fitting 40 is formed in an arch shape (substantially U-shape in the present embodiment) whose cross-sectional shape in a direction substantially perpendicular to the extending direction of the arm bracket 36 is opened downward.

When fixing the stopper fitting 40 to the upper end of the outer cylinder fitting 20, first, the flange portion 42 of the stopper fitting 40 is placed on the mounting portion 22 of the outer cylinder fitting 20. At this time, the outer peripheral surface of the support reinforcing portion 21 of the outer tube fitting 20 corresponds to FIG.
As shown in (2), the stopper fitting 40 comes into contact with the inner peripheral surface of the open end. At the same time, in the stopper fitting 40, the top plate portion 40 </ b> B comes into contact with the top surface of the cover member 38 covered by the arm bracket 36. In this state, as shown in FIG. 2, a pressing force F is applied to the vicinity of the upper end of the caulked portion 24 from the outer peripheral side in the radial direction. As a result, the caulking portion 24 having the shape shown by the two-dot chain line before pressurization is formed.
As shown by the solid line, the caulked portion 24 is bent inward with the upper surface side edge portion of the flange portion 42 as a fulcrum, and the flange portion 18 and the flange portion 42 are clamped by the caulked portion 24 and the mounting portion 22 from above and below. .

As described above, the caulking portion 24 is plastically deformed to the inner peripheral side and the caulking portion 24 is pressed against the flange portion 42 so that the lower end portion of the stopper fitting 40 becomes the outer cylindrical fitting 2.
0 is fixed to the upper end. At this time, the stopper fitting 40
2, the side plate portion 40A faces both side surfaces of the arm bracket 36 via the cover member 38, and the top plate portion 40B faces the base-side upper surface of the arm bracket.

On the other hand, as shown in FIG. 2, a cylindrical support ring 46 is arranged in the inner cylinder fitting 12. A thin-film diaphragm 48 is provided on the inner peripheral surface of the support ring 46.
The outer peripheral end is vulcanized and bonded over the entire circumference, and the diaphragm 48 projects upward in a substantially truncated cone shape in a natural state where no bending deformation occurs. The outer peripheral surface of the support ring 46 is in pressure contact with the inner peripheral surface of the lower cylindrical portion 16 of the inner cylinder fitting 12 via the covering portion 30D of the elastic body 30.
The lower end of the support ring 46 abuts on the reduced-diameter portion 16A of the lower cylindrical portion 16 via the covering portion 30D, thereby preventing the support ring 46 from falling out of the inner cylindrical fitting 12.

As shown in FIG. 2, the diaphragm 48
A space surrounded by the elastic body 30 is a liquid chamber 50, and a liquid such as water or oil is sealed in the liquid chamber 50. In the lower cylindrical portion 16, the liquid chamber 50 is provided above the diaphragm 48 with two main liquid chambers 5 as small liquid chambers.
A partition member 56 for partitioning into the second liquid chamber 54 and the sub liquid chamber 54 is fitted.

A circular opening 56A penetrating the upper and lower surfaces is formed at the center of the partition member 56, and this circular opening 56A is formed.
Is closed by a rubber membrane 57. The outer peripheral surface of the partition member 56 is pressed against the inner peripheral surface of the lower cylindrical portion 16 via the covering portion 30D of the elastic body 30. Further, the edge of the partition member 46 on the outer peripheral side of the upper surface is in contact with the constricted portion 15 between the lower cylindrical portion 16 and the upper cylindrical portion 14 via the covering portion 30D. Thereby, the upward movement of the partition member 56 in the inner cylindrical fitting 12 is restricted.

As shown in FIG. 2, a groove 58 is formed on the outer peripheral surface of the partition member 56 over one circumference in the circumferential direction. The outer peripheral side of the groove 58 is covered with the covering 3 of the elastic body 30.
Closed by 0D. Also, at one end of the groove 58,
A small-diameter through hole 60 that communicates the main liquid chamber 52 with the inside of the groove 58.
The sub liquid chamber 54 and the groove 5 are formed at the other end of the groove 58.
8, a small-diameter through-hole 62 is formed to communicate with the inside.
Here, the groove 58 and the through holes 60, 62 constitute an orifice 64 that communicates between the main liquid chamber 52 and the sub liquid chamber 54.

As shown in FIG. 2, an air chamber 66 for allowing the diaphragm 48 to bend and deform is formed between the diaphragm 48 and the bottom plate of the outer cylinder 20. In addition, an air hole 68 that communicates the air chamber 66 to the outside to penetrate the bottom plate portion of the outer cylinder member 20 to suppress a change in the internal pressure is penetrated.

As shown in FIG. 2, the partition member 56 is formed with a rib 56B extending from the upper end of the inner peripheral surface of the circular opening 56A toward the axis L. In the membrane 57, a circular convex portion 57A having an outer diameter substantially equal to the inner diameter of the rib 56B is formed at the center of the upper surface, and a circular concave portion 57B is formed at the center of the lower surface. The projection 57A of the membrane 57 is inserted into the inside of the rib 56B, and the outer peripheral surface and the outer peripheral surface of the upper surface are vulcanized and bonded to the lower surface of the rib 56B and the inner peripheral surface of the circular opening 56A. Here, the upper surface of the partition member 56 and the upper surface of the protrusion 57A are flush with each other.

Below the partition member 56, a fixture 70 is arranged as shown in FIG. The fixing member 70 is formed of a thin metal plate. The fixing member 70 has a circular convex portion 70 formed in a central portion in a cup shape and protruding upward.
A is formed, and a ring-shaped flange portion 70B extending from the lower end of the convex portion 70A to the outer peripheral side is formed. The convex portion 70A of the fixing bracket 70 is fitted into the circular opening 56A of the partition member 56 from below, and the top plate portion of the convex portion 70A contacts the outer peripheral portion of the lower surface of the membrane 57. As a result, the outer periphery of the membrane 57 is
6B and the projection 70A, and are securely fixed, and a flat space in the axial direction is formed between the recess 57B of the membrane 57 and the projection 70A of the fixture 70.
This space communicates with the auxiliary liquid chamber 54 through a plurality of through holes 70C formed in the top plate of the projection 70A. The flange portion 70B of the fixture 70 is sandwiched between the upper end surface of the support ring 46 and the bottom surface of the partition member 56, whereby the movement of the fixture 70 in the auxiliary liquid chamber 54 is restricted.

An opening 70D is formed in the side wall of the projection 70A of the fixture 70 so as to face the through hole 62 of the partition member 56. The opening 70D is formed through the opening 70D.
Communicates with the inside of the auxiliary liquid chamber 54.

(Operation of Embodiment) Next, the operation of the vibration isolator 10 according to the present embodiment will be described. In the vibration isolator 10 of the present embodiment, when the engine connected to the distal end of the arm bracket 36 operates, the arm bracket 36 and the mounting bracket 32 are relatively displaced with respect to the inner cylinder 12 due to vibration from the engine. Thereby, the elastic body 30 interposed between the mounting fitting 32 and the inner cylindrical fitting 12 is elastically deformed.
At this time, the elastic body 30 functions as a vibration absorber, and the vibration from the engine is absorbed by a vibration absorbing action based on the internal friction of the elastic body 30. Further, since the rubber cover member 38 is interposed between the arm bracket 36 and the stopper fitting 40, the cover member 38 is elastically deformed with the displacement of the arm bracket 36. Thereby, a part of the vibration transmitted from the engine is also absorbed by the internal friction of the cover member 38.

In the vibration isolator 10 of the present embodiment, in addition to the vibration absorbing action of the elastic body 30 and the cover member 38 as described above,
Vibration can also be absorbed by changes in the pressure of the liquid sealed in the orifice 64 and the liquid chambers 52 and 54.

That is, when the elastic body 30 is elastically deformed at the time of vibration input from the engine, the internal volume of the main liquid chamber 54 expands and contracts with the elastic deformation. Accordingly, when vibrations in a relatively low frequency range among the vibrations input from the engine, for example, shake vibrations or the like are input, the liquid sealed in the main liquid chamber 52 and the liquid sealed in the sub liquid chamber 54 are orificed. Vibration energy is absorbed by the pressure change of the liquid generated in the orifice space formed by the orifice 64 and the viscous resistance of the liquid flow. Can be absorbed effectively.

On the other hand, when vibrations in a relatively high frequency range, such as idle vibrations, are input from the engine, the orifices 64 corresponding to the vibrations in the relatively low frequency range are clogged and cannot absorb the vibrations. Sometimes,
The membrane 57 is elastically deformed by the vibration in the high frequency range transmitted to the liquid in the main liquid chamber 52, thereby suppressing an increase in the internal pressure in the main liquid chamber 52. As a result, even when vibration in a relatively high frequency range is input from the engine, the dynamic spring constant of the vibration isolator 10 is reduced by the liquid in the main liquid chamber 52, and vibration in the high frequency range can be effectively absorbed.

Further, in the vibration isolator 10 of the present embodiment, when vibration of excessive amplitude is input from the engine, the stopper fitting 40 fixed to the outer cylinder fitting 20 faces the base end of the arm bracket 36. By doing so, the relative displacement of the arm bracket 36 and the mounting bracket 32 with respect to the inner cylinder 12 is limited to a certain range. At this time, since the cover member 38 is interposed between the arm bracket 36 and the stopper fitting 40, the displacement amount of the arm bracket 36 increases and the deformation resistance of the cover member 38 also increases. As a result, the impact force acting on the arm bracket 36 due to the vibration input from the engine is reduced, and the arm bracket 36 and the stopper fitting 40 are prevented from being broken. Further, since the arm bracket 36 does not directly collide with the stopper fitting 40 by the cover member 38, the generation of an impact sound is also prevented.

In the vibration isolator 10 of the present embodiment, when the stopper fitting 40 is fixed to the upper end of the outer cylindrical fitting 20, the flange 42 of the stopper fitting 40 is used as described above.
Is placed on the mounting portion 22 of the outer tube fitting 20. At this time,
The outer peripheral surface of the support reinforcing portion 21 of the outer cylindrical member 20 comes into contact with the inner peripheral surface of the opening end of the stopper member 40. Thereafter, the pressing force F (see FIG.
Then, the caulking portion 24 is bent toward the inner peripheral side, and the flange portion 42 is sandwiched between the caulking portion 24 and the mounting portion 22 from above and below. Thus, in a state in which the flange portion 40 of the stopper fitting 40 is placed on the mounting portion 22 of the outer tubular fitting 20, the pressing force F is applied to the swaging portion 24 of the outer tubular fitting 20, and the swaging portion 24 is moved. When plastically deforming inward so as to clamp the flange portion 40 on the mounting portion 22, the caulking portion 2
4, the pressing force F is transmitted to the flange portion 42.
Near the opening end of the stopper fitting 40 and the flange 4
2 is prevented by the support reinforcing portion 21 of the outer cylinder 20, the pressing force F transmitted via the flange 42 causes the vicinity of the opening end of the stopper 40 and the flange 42 to move. Does not deform. Further, the support reinforcement 21
As a result, the vicinity of the open end of the outer cylinder 20 is reinforced, so that the strength near the open end of the outer cylinder 20 can be improved, and the outer cylinder 20 is deformed by the pressing force F transmitted through the flange 42. Can also be prevented.

As a result, the support reinforcing portion 21 of the outer cylindrical fitting 20 is formed.
If the strength of the caulking portion 24 is sufficiently increased with respect to the strength of the caulking portion 24, even if a large pressing force F is applied to the caulking portion 24 when the stopper metal member 40 is caulked and fixed to the outer cylindrical metal member 20, the stopper metal member will Local deformation and distortion of the outer tube fitting 40 and the outer tube fitting 20 can be reliably prevented.

Further, in the vibration isolator 10 of the present embodiment, the support reinforcement portion 24 can be formed on the outer cylinder 20 by folding back the open end of the outer cylinder 20 made of a metal plate.
The high-strength support reinforcing portion 21 can be formed only by a simple working operation such as press working on the outer tube fitting 20 without increasing the number of parts of the apparatus.

In the vibration isolator 10 of the present embodiment, the flange portion 42 and the fitting portion 44 are provided on the stopper fitting 40, and the mounting portion 22 on which the flange portion 42 is mounted,
The caulking portion 24 for caulking and fixing the flange portion 42 and the fitting groove 26 into which the fitting portion 44 is fitted are provided on the outer cylinder 20. Conversely, the flange portion and the fitting portion are removed. The stopper, the mounting portion, the caulked portion, and the fitting groove may be provided on the stopper fitting 40.

Further, in the vibration isolator 10 of the present embodiment, the support reinforcing portion 21 is formed of a two-layer metal plate in which the opening end of the outer tube fitting 20 is folded, but the opening end of the outer tube fitting 20 is turned back. By increasing the number of times, the support reinforcing portion 21 may be formed of a three-layer or four-layer metal plate, or may be formed separately from the outer cylindrical metal member 20, for example, by forming the ring-shaped support reinforcing member into an outer cylindrical metal member. The outer peripheral surface or the inner peripheral surface of the opening end of the opening 20 may be covered and fixed.

[0050]

As described above, according to the vibration isolator of the present invention, even when a large pressing force is applied to the caulking portion of the outer cylinder member when the stopper member is caulked and fixed to the outer cylinder member, the stopper member can be used. And the deformation of the outer cylinder member can be reliably prevented.

[Brief description of the drawings]

FIG. 1 is an axial sectional view showing a disassembled state of a vibration isolator according to an embodiment of the present invention.

FIG. 2 is a sectional view along an axial direction showing an internal structure of the vibration isolator according to the embodiment of the present invention.

FIG. 3 is a side view showing the vibration isolator according to the embodiment of the present invention.

FIG. 4 is a perspective view showing the vibration isolator before the arm bracket, the cover member, and the stopper fitting according to the embodiment of the present invention are assembled.

FIG. 5 is a perspective view showing a vibration isolator according to the embodiment of the present invention.

FIG. 6 is a plan view showing the vibration isolator according to the embodiment of the present invention.

FIG. 7 is a cross-sectional view along an axial direction showing a state where an example of a conventional vibration isolator is disassembled.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Vibration isolator 14 Inner cylinder fitting (2nd mounting member) 20 Outer cylinder fitting (outer cylinder member) 21 Support reinforcement part 22 Placement part 24 Caulking part 30 Elastic body 32 Mounting bracket (1st mounting member) 36 Arm Bracket (first mounting member) 40 Stopper fitting (stopper member) 42 Flange part

Claims (2)

[Claims] A first mounting member connected to one of the vibration generating section and the vibration receiving section; a second mounting member; and a first mounting member and a second mounting member disposed between the first mounting member and the second mounting member. An elastic body, a cylindrical outer cylindrical member connected to the other of the vibration generating unit and the vibration receiving unit, and into which the second mounting member is inserted and fixed;
An arcuate shape fixed to the outer cylinder member and opposed to the first mounting member, restricting relative displacement of the first mounting member with respect to the second mounting member, and opening the outer cylinder member side. A stopper member having a cross section, wherein the stopper member is formed with a flange portion extending to an outer peripheral side along an opening end on the outer cylinder member side; The member is formed along the opening end on the stopper member side and on which the flange portion is mounted, and sandwiches the flange portion on the mounting portion formed along the outer peripheral end of the mounting portion. A plate-shaped caulking portion plastically deformed to the inner peripheral side so as to have, and a support reinforcing portion formed along the inner peripheral end of the mounting portion and abutting against the inner peripheral surface of the stopper member. Characteristic anti-vibration device. 2. The vibration damping device according to claim 1, wherein the support reinforcing portion is formed of a two-layer plate-like piece formed by folding an open end of the outer cylindrical member.