JP2002213510A - Vibration control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration control device wherein a buffering member is reliably mounted, the buffering characteristics of the buffering member can be easily changed, and the buffering characteristics can be made comparatively sluggish. SOLUTION: In the cylindrical vibration control device equipped with an external cylinder 10, an internal cylinder 20, a rubber vibration isolator 30, and stopper rubbers 31, 32 to suppress excessive deformation of the rubber vibration isolator 30, a stopper 40 to prevent the external cylinder 10 from directly abutting or a bracket 4 and to buffer the abutting is covered on the both end rims of the external cylinder 10. The cross section of the stopper part 42a of a rubber ring 42 practically abutting or the bracket 4 is formed into a semicircular shape, and thereby, its buffering characteristics is made comparatively sluggish.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration isolator for absorbing vibration from a vibration source.

[0002]

2. Description of the Related Art For example, an engine mount for mounting an engine on a vehicle body frame employs an anti-vibration device that absorbs engine vibrations and suppresses transmission of the vibrations into the vehicle body frame and, consequently, the vehicle interior. As this type of vibration isolating device, a tubular type in which a vibration isolating rubber is interposed between an outer cylinder and an inner cylinder disposed in the outer cylinder is generally used. FIG. 9 shows an example of such an anti-vibration device. In the drawing, reference numeral 10 denotes an outer cylinder, 20 denotes an inner cylinder, and 30 denotes an anti-vibration rubber. In this vibration isolator 9, the inner cylinder 20 is attached to the body frame 3 via the bracket 4 by fastening the nut 6 to the bolt 5 passing through the pair of brackets 4 and the inner cylinder 20, while the outer cylinder 10 is Is attached to an engine (not shown) via an engine attachment portion 11 provided on the outer cylinder 10.

As shown in FIG. 9, a rubber stopper 70 is interposed between the vibration isolator 9 and the bracket 4 in a state fitted in the inner cylinder 20. A slight clearance is set between the vibration isolator 9 and the bracket 4 in order to enable attachment, and for example, the vibration isolator 9 slightly moves in the axial direction due to a reaction generated when the vehicle is accelerated or decelerated. To the bracket 4 by the stopper 70.
The collision of the outer cylinder 10 with the cylinder is buffered.

[0004]

The above-mentioned stopper 70 is
When the inner cylinder 20 is mounted on the bracket 4, the inner cylinder 20 is fitted into the inner cylinder 20, but at that time, it may come off or be forgotten. Further, since the stopper 70 is a mere disk having a constant thickness, the buffer characteristics of the vibration isolator 9
That is, when it is required to change the degree of buffering by the stopper 70, the material (hardness) of the stopper 70 is required.
And could only be done by changing the thickness. Further, since the thickness of the stopper 70 is constant, the displacement of the vibration isolator 9 due to the compression amount of the stopper 70 is rapidly reduced from the moment the stopper 70 hits the bracket 4 as shown in FIG. As a result, as a result, the transmission of vibration rapidly increased, and vibration and noise were easily caused.

According to the present invention, a cushioning member (corresponding to the above stopper) is securely mounted, and it is easy to change the cushioning characteristics of the cushioning member, and to obtain a relatively slow cushioning characteristic. It is an object of the present invention to provide an anti-vibration device capable of performing the following.

[0006]

SUMMARY OF THE INVENTION The present invention is directed to a cylindrical mold having an outer cylinder, an inner cylinder, and an elastic body interconnecting the cylinders, and a pair of support portions extending along both end surfaces thereof. In the vibration isolator attached via a fastening member passed through the inner cylinder, at least a portion of the outer cylinder facing the support portion at the edge of the outer cylinder prevents the outer cylinder from directly contacting the support portion,
In addition, a buffer member for buffering is covered. Rubber is suitably used as the cushioning member of the present invention.

According to the vibration damping device of the present invention, the movement of the vibration damping device in the axial direction and collision with the support portion is buffered by the buffer member. Since the cushioning member is preliminarily covered with the outer cylinder, the mounted state is reliably maintained, and therefore, there is no problem that the cushioning member is detached at the time of assembling or forgets to attach the cushioning member. In addition, by appropriately changing the cross-sectional shape of the cushioning member that is compressed by hitting the support, the cushioning characteristics of the vibration isolator with respect to the support can be easily changed. And by making the cross-sectional shape such that the amount of compression gradually decreases as it receives compression, a slow buffering characteristic is obtained, and as a result, rapid transmission of vibration is suppressed, and vibration and noise are generated. It becomes difficult to do.

In a preferred embodiment of the present invention, a recess is provided on a surface of the cushioning member to be attached to the outer cylinder, and the recess is filled with an adhesive. In this mode, the cushioning member is bonded to the outer cylinder with an adhesive, and the thickness of the adhesive is ensured by the concave portion to a thickness that exhibits a sufficient adhesive force, so that sufficient adhesive strength is obtained. Can be. Further, in the cushioning member of this embodiment, it is preferable that a convex portion that comes into contact with the end surface of the outer cylinder is formed because the convex portion prevents the adhesive from flowing out.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a cylindrical type vibration damping device 1 according to an embodiment suitable as an engine mount of an automobile, and a pair of brackets (support portions) 4 attached to a body frame 3.
2 shows a state in which the camera is mounted via a. The bracket 4 has a shape and dimensions covering both end surfaces of the vibration isolator 1, and the vibration isolator 1 is disposed between the brackets 4. As shown in FIG. 2, the vibration isolator 1 connects the outer cylinder 10, the inner cylinder 20 coaxially arranged in the outer cylinder 10, the outer cylinder 10 and the inner cylinder 20, and connects the inner cylinder 20 to the center thereof. The outer cylinder 10 includes an anti-vibration rubber (elastic body) 30 through which the cylinder 20 penetrates, and two stopper rubbers 31 and 32 provided on the inner surface of the outer cylinder 10. Outer cylinder 1
The inner cylinder 20 and the inner cylinder 20 are made of a metal such as iron or aluminum, or a synthetic resin, and the anti-vibration rubber 30 and the stopper rubbers 31 and 32 are respectively vulcanized and formed of an appropriate rubber material.

The anti-vibration rubber 30 has a concave upper side in FIG.
The elastic body has an arc shape in which the lower side is convex, and the uneven direction (the vertical direction in FIG. 2) is set to the main vibration direction.
At the time of vulcanization molding, both ends of the vibration isolating rubber 30 are bonded to the inner peripheral surface of the outer cylinder 10 and the center is bonded to the inner cylinder 20 by vulcanization. Above and below the anti-vibration rubber 30, stopper rubbers 31 and 32, which are vulcanized at the same time as the anti-vibration rubber 30 and are vulcanized and bonded to the inner peripheral surface of the outer cylinder 10, are arranged. There is an interval between the stopper rubbers 31 and 32 and the vibration isolating rubber 30 to allow vibration of the vibration isolating rubber 30. The upper stopper rubber 31 has a semicircular cross section projecting downward, and the lower stopper rubber 32 has a crescent shape in which the upper surface is more gradually curved than the inner peripheral surface of the outer cylinder 10. .

A trapezoidal engine mounting portion 11 is provided on the outer peripheral surface of the outer cylinder 10 by integral molding or fixing by welding. In this engine mounting part 11,
A pair of bolts 1 passed through an engine-side mounting hole (not shown)
2 are provided integrally.

Stoppers (buffer members) 40 are respectively covered on both end edges of the outer cylinder 10 of the vibration isolator 1. These stoppers 40 are formed by bonding a rubber ring 42 to an outer periphery of a ring-shaped metal core material 41 by vulcanization. FIG.
As shown in (a), the core member 41 has a cylindrical portion 41 a having an inner diameter substantially equal to the outer diameter of the outer cylinder 10 and fitted to the outer periphery of the outer cylinder 10.
It has an L-shaped cross section having an end surface of the outer cylinder 10 and a seat portion 41b protruding toward the inner peripheral side of the outer cylinder 10. The rubber ring 42 is, as shown in FIG.
It has a semicircular stopper portion 42a projecting axially outward to cover 1b, and a rectangular extending portion 42b extending inward from the core 41. FIG. 3B shows the stopper 40 that is not covered by the outer cylinder 10. As is apparent from FIG. 3B, the inner diameter of the extension 42 b is smaller than the inner diameter of the core 41, and therefore, the extension Reference numeral 42b denotes a state in which the outer cylinder 10 is wound around by elasticity.

The stopper 40 extends the diameter of the extension 42b of the rubber ring 42 while increasing the diameter of the cylinder 41a of the core 41.
Is fitted to the outer cylinder 10 and the seat 41b is
Then, the outer surface of the outer cylinder 10 is covered as shown in FIG. 1 by releasing the expansion of the extension 42b. In this state, the extension portion 42b winds the outer cylinder 10, and the stopper 40 does not fall off. In addition, in order to suppress the deterioration with time of the extension part 42b, it is preferable that the extension rate of the rubber ring 42 is 1 to 10% or less.

As shown in FIG. 1, a vibration isolator 1 according to the present embodiment in which stoppers 40 are attached to both end edges of an outer cylinder 10 has a pair of brackets 4 and bolts (fastening members) 5 passed through the inner cylinder 20. The inner cylinder 20 is attached to the vehicle body frame 3 via the bracket 4 by fastening the nut (fastening member) 6 to the vehicle body, while the outer cylinder 10 is attached to the engine mounting portion 11.
It is attached to the engine by using the bolts 12. The vibration of the anti-vibration rubber 30 absorbs the vibration of the engine, and the transmission of the vibration to the vehicle body frame 3 and thus the vehicle interior is suppressed.

In such an anti-vibration function, the anti-vibration rubber 30 is used.
When the amplitude becomes large and the vibration is excessively displaced, the vibration isolating rubber 30 comes into contact with the upper and lower stopper rubbers 31 and 32, and further displacement, that is, vibration is suppressed. In addition, for example, the anti-vibration device 1 slightly moves in the axial direction due to a reaction generated when the vehicle is accelerated or decelerated.
Stopper portion 42a elastically collides with the bracket 4,
The collision of the outer cylinder 10 against the bracket 4 is buffered. When the stopper portion 42a collides with the bracket 4, the stopper portion 42a is compressed with the seat portion 41b as a seating surface, thereby performing a buffering action.

According to the vibration isolator 1 of the present embodiment, the stopper 40, which is a cushioning member, is securely held in the mounted state by being covered with the outer cylinder 10 in advance. There is no inconvenience that the stopper 40 is detached or the stopper 40 is forgotten when assembling the bracket 1 to the bracket 4. The stopper 42a of the rubber ring 42 that collides with the bracket 4 is
Since the cross section is semicircular, the stopper portion 42a
8, that is, the amount of displacement of the vibration isolator 1 is shown in FIG.
As shown in FIG. 7A, the buffer characteristics gradually decrease, and the buffer characteristics become relatively slow. As a result, vibration and noise generated by the vibration isolator 1 colliding with the bracket 4 are suppressed. Such a buffering property is obtained by the cross-sectional shape of the stopper portion 42a.
If the shape becomes thinner toward the tip, it is easy to obtain. In addition, by appropriately changing the cross-sectional shape of the stopper portion 42a of the rubber ring 42 that is subjected to compression by being applied to the bracket 4, the buffer characteristic of the vibration isolator 1 with respect to the bracket 4 can be easily changed.

FIG. 4 shows a modification of the stopper.
4A, the stopper portion 42a of the rubber ring 42 has a rectangular cross section. In the stopper shown in FIG. 4B, the stopper portion 42 a is the same as the stopper 40, but the cylindrical portion 41 a of the core 41 is omitted, and only the seat 41 b is configured as the core 41. Also,
As shown in FIG. 4C, a case where a bent portion 10a bent to the inner peripheral side is formed at the end edge of the outer cylinder 10, and the amount of protrusion of the bent portion 10a toward the inner peripheral side is larger than the stopper portion 42a. , The stopper can be constituted only by the rubber ring 42. This is a suitable seating surface when the rubber ring 42 collides with the bracket 4 and the stopper portion 42a is compressed.
This is because the bent portion 10a plays the role of the seat 41b of the core 41.

Next, another embodiment of the present invention will be described with reference to FIGS. FIG. 5 shows a state in which the vibration isolator 2 of another embodiment is attached to the vehicle body frame 3 via a pair of brackets (support portions) 7. The bracket 7 in this case is, as shown in FIG.
And an inner cylinder 20 of the vibration isolator 2 is fastened to the tip of the arm by a bolt 5 and a nut 6. The vibration isolator 2 includes an outer cylinder 10 and an inner cylinder 2 provided with an engine mounting portion 11 similarly to the stopper 40 of the above embodiment.
The outer cylinder 10 is provided with a stopper (buffer member) 50.

The stopper 50 is provided on the bracket 7 of the outer cylinder 10.
An arc-shaped metal core member 51 fitted to the outer peripheral surface of a portion corresponding to the above, and a rubber ring 52 are provided. The core member 51 is attached to the end of the circular arc portion 51a over the entire width of the outer cylinder 10 by the outer cylinder 1
0 is formed in a U-shaped cross-section in which seat portions 51b are formed which abut on both end edges of the outer cylinder 10 and protrude toward the inner peripheral side of the outer cylinder 10. The rubber ring 52 is vulcanized and adhered to the outer peripheral surface of the core material 51, and has a stopper portion 52a having a semicircular cross section that projects outward in the axial direction so as to cover the seat portions 51b on both sides of the core material 51, Further, it has a pair of ring portions 52b wound around the outer cylinder 10. The inner diameter of each ring portion 52b is smaller than the outer diameter of the outer cylinder 10,
Therefore, the ring portion 52b is in a state in which the outer cylinder 10 is wound around by elasticity.

The stopper 50 fits the core member 51 to the outer cylinder 10 while expanding the diameter of the ring portion 52b of the rubber ring 52 so that the seat portions 51b on both sides abut on the end surfaces of the outer cylinder 10, The outer cylinder 1 is released by releasing the diameter of the portion 52b.
0. In this state, the ring portion 52b is
Is stopped and the stopper 50 does not fall off. In addition, in order to suppress the deterioration with time of the ring portion 52b, it is preferable that the extension rate of the rubber ring 52 is 1 to 10% or less.

As shown in FIGS. 5 and 6, the vibration isolator 2 of the present embodiment in which the stopper 50 is mounted on the outer cylinder 10 has the following features.
Pass the bolt 5 through the pair of brackets 7 and the inner cylinder 20,
With the stopper portion 52 a of the rubber ring 52 corresponding to the bracket 7, the nut 6 is fastened to the bolt 5 and the inner cylinder 20 is attached to the bracket 7. The outer cylinder 10 is attached to an engine (not shown) using the bolts 12 of the engine attachment portion 11 provided on the outer cylinder 10.
When the anti-vibration device 2 moves in the axial direction due to a recoil generated when the vehicle is accelerated or decelerated, the rubber ring 52 of the stopper 50 is moved.
Stopper portion 52a elastically collides with the bracket 7,
The collision of the outer cylinder 10 with the bracket 7 is buffered. According to this embodiment also, the stopper 50 is securely mounted on the outer cylinder 10, and a relatively slow buffering characteristic can be obtained due to the cross-sectional shape of the stopper portion 52 a of the rubber ring 52.

The stoppers 40 and 50 of the above embodiments are
The outer cylinder 1 is made using the elasticity of the rubber rings 42 and 52, respectively.
However, as shown in FIG. 7, the stopper can be bonded to the outer cylinder 10 with an adhesive. The stopper 40A shown in FIG. 7A is the same as the stopper 4 shown in FIG.
0, but the diameter of the core material 41 is larger than that of the outer cylinder 10, and a recess 43 is formed by the extension 42 b of the rubber ring 42 and the core material 41. Then, the stopper 40A is moved to the outer cylinder 1 by the adhesive 60 filled in the recess 43.
0. According to this bonding structure, the adhesive 6
Since the film thickness of 0 is ensured by the recess 43 to have a sufficient adhesive strength, sufficient adhesive strength can be obtained. There is also an advantage that the outflow of the adhesive is prevented by the extension portion 42b.

In the case of FIG. 7 (b), a bent portion 10a is formed at the end edge of the outer cylinder 10 as shown in FIG. 4 (c). The outer cylinder 10 is provided on the inner peripheral edge of the stopper portion 42a of the rubber ring 42.
Ring-shaped ridges (convex portions) 42 that contact the bent portions 10a of the
c is formed. The stopper 40B is adhered to the outer cylinder 10 by the adhesive 60 filled in the recess 43. According to this embodiment, the outflow of the adhesive 60 to the end face side is prevented by the ridge 42c of the rubber ring 42, and the outflow of the adhesive 60 is more effectively prevented together with the extension 42b.

The adhesive 60 is an epoxy-based adhesive.
Thermosetting synthetic adhesives represented by polyurethanes, acrylics and the like are preferably used. In addition, the outer cylinder 10
It is preferable that a rust prevention treatment such as a chemical conversion treatment or an easy adhesion treatment has been performed in advance. The bonding structure shown in FIG.
1 is adhered to the outer cylinder 10, but only the rubber ring 42 is removed except for the core 41, and this rubber ring 42 is attached to the outer cylinder 10.
May be adhered to. In this case, in order to enhance the adhesive effect of the rubber ring 42, the rubber ring 42 may be activated by performing an appropriate surface treatment such as chlorination.

[0025]

As described above, according to the vibration damping device of the present invention, the cushioning member is securely attached to the support portion, and the cushioning characteristics of the cushioning member can be easily changed. This produces an effect that a relatively slow buffer characteristic can be obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a vibration isolator according to an embodiment of the present invention.

FIG. 2 is a perspective view of a main part of the vibration isolator according to one embodiment of the present invention.

3A is a cross-sectional view showing a mounting structure of a stopper of the vibration isolator according to one embodiment of the present invention, and FIG. 3B is a cross-sectional view of the stopper.

FIGS. 4A, 4B, and 4C are cross-sectional views each showing a modification of the stopper according to the embodiment of the present invention.

FIG. 5 is a cross-sectional view of a vibration isolator according to another embodiment of the present invention.

FIG. 6 is a perspective view of a vibration isolator according to another embodiment of the present invention.

FIGS. 7A and 7B are cross-sectional views each showing a bonding structure of a stopper according to the present invention.

FIG. 8A is a diagram illustrating a buffer characteristic of a stopper according to an embodiment of the present invention, and FIG. 8B is a diagram illustrating a buffer characteristic of a conventional stopper.

FIG. 9 is a cross-sectional view illustrating an example of a conventional vibration damping device.

[Explanation of symbols]

 Reference numerals 1 and 2: anti-vibration devices 4, 7: brackets (support portions) 5: bolts (fastening members) 6: nuts (fastening members) 10: outer cylinder 20: inner cylinder 30: anti-vibration rubber (elastic body) 40, 50 ... stopper (cushioning member) 42c ... ridge (convex) 43 ... recess 60 ... adhesive

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3D035 CA05 CA06 3J059 AA04 BA42 BA66 BB04 BD01 BD07 CB03 CB09 DA14 EA13 GA07

Claims (3)

[Claims] 1. A cylindrical shape comprising an outer cylinder, an inner cylinder, and an elastic body interconnecting the cylinders, and is passed through the inner cylinder through a pair of support portions extending along both end surfaces thereof. In a vibration isolator attached via a fastening member, at least a portion of the outer cylinder at an end edge facing the support section, preventing the outer cylinder from directly contacting the support section,
A vibration isolator characterized by being covered with a buffer member for buffering. 2. The vibration damping device according to claim 1, wherein a recess is provided on a surface of the cushioning member to be attached to the outer cylinder, and the recess is filled with an adhesive. 3. The anti-vibration device according to claim 2, wherein a convex portion is formed on the buffer member so as to abut on an end surface of the outer cylinder.