JP2605795Y2 - Anti-vibration device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration isolator and, more particularly, to a mass damper mounting structure for an engine mount.

[0002]

2. Description of the Related Art As is well known, an engine mount is provided between an automobile engine and a vehicle body for supporting the engine and the transmission and preventing transmission of vibration from the engine and the transmission to the vehicle body.

In this type of vibration damping structure using an engine mount, an engine is elastically supported via a rubber elastic body or the like in a bracket for the engine mount, and a mass damper is attached to the bracket to specify a specific frequency range. It has been practiced to prevent vibration.

[0004] Such a mass damper mounting structure includes a structure in which a rubber elastic body integrated with a part of the mass damper is directly vulcanized and bonded to the outer surface of the bracket, and a metal plate attached to the rubber elastic body. There is a structure that attaches this metallic plate.

However, in such a structure, for example, in the case of directly vulcanizing and bonding to a bracket, if the bracket becomes large, the vulcanizing mold for vulcanizing and bonding must be enlarged accordingly, resulting in cost reduction. There was a problem that led to up.

Further, in the case of direct welding, it is necessary to paint the bracket to prevent rust. However, since the rubber elastic body integrated with the plate cannot withstand the high temperature during painting, the drying temperature is lowered. There was an inconvenience that only dipping painting could be performed.

In order to solve such a problem, a structure described in Japanese Utility Model Laid-Open No. 3-107549 has been proposed as an example.

The structure according to the above publication is, as shown in FIG. 3, a weight 10, a rubber elastic body 12, and a plate 1
4 is provided with a mass damper 16 which is integrated by sequentially stacking them. A protruding piece 14 </ b> A having a predetermined length is provided from a part of the plate 14 along the axial direction of the bracket 18. When such a mass damper is attached to the bracket, the protruding pieces of the plate are bent at both ends in the axial direction of the bracket so as to clamp the bracket 18.

[0009]

However, in the above-described structure, the plate needs to have a special shape. In addition, when fixing to a bracket, special processing such as swaging or bending is required. Moreover, when the protruding piece is clamped by the bracket,
The clamping pressure of the projecting piece against the bracket must be extremely high. This is important from the viewpoint of preventing the bracket from being displaced in the circumferential direction. That is, in the circumferential direction of the bracket, it is important to correctly define the position of the mass damper from the viewpoint of changing the resonance frequency acting on the bracket. In other words, it is necessary to hold the bracket at the most suitable position in order to suppress the vibration of the bracket. However, simply bending or swaging the protruding piece does not make the positioning appropriate.

In view of the above-mentioned problems in the conventional vibration isolator, the object of the present invention is to enable fixing by a simple operation without requiring any special processing and to displace the bracket with respect to the bracket. It is an object of the present invention to provide a vibration isolator having a structure capable of preventing the vibration.

[0011]

In order to achieve this object, the invention according to claim 1 includes a mass damper in which a weight and a plate are integrated via an elastic body, and the mass damper has a cylindrical vibration isolator. The bracket has a structure attached to a bracket into which the member is press-fitted, and the bracket includes a flange portion having an opening having a size capable of press-fitting the cylindrical vibration isolating member, and the flange portion has a circumferential direction. A dent for inserting the plate of the mass damper is formed in a part, and the plate is inserted in the dent,
The mass damper is held by the cylindrical vibration isolating member and the depression.
It has a structure to be .

According to a second aspect of the present invention, in the first aspect, the depression is directed outward from the center of the opening by an amount corresponding to the plate thickness of the plate or less than the inner diameter of the opening of the flange. It is characterized by being enlarged in diameter.

According to a third aspect of the present invention, in the first aspect, the recess is expanded outward from the center of the opening by an amount slightly smaller than the thickness of the plate with respect to the inner diameter of the flange. It is characterized by having.

According to a fourth aspect of the present invention, in the first aspect, the mass damper includes a flat plate having a length corresponding to the axial length of the bracket. A weight is provided at a substantially central position in the direction via the elastic body.

[0015]

According to the present invention, the mass damper is held by the outer cylinder pressed into the bracket. That is, a recess for inserting the plate of the mass damper is provided in a part of the flange portion of the bracket in the circumferential direction.
Therefore, when the plate of the mass damper is inserted into the recess, the plate is pressed down by the outer peripheral surface of the cylindrical vibration isolating member press-fitted into the bracket. Further, the bracket does not shift in the circumferential direction of the bracket.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to the embodiments shown in the drawings. In FIG. 1, the same components as those shown in FIG. 3 are denoted by the same reference numerals.

FIG. 1 is a perspective view showing the entire structure of the vibration isolator according to the present invention.

That is, the bracket 20 into which the cylindrical vibration isolating member 30 is press-fitted is made of a sheet metal member whose side view is formed in an upward U-shape. In this case, the cylindrical vibration isolating member 30 includes an outer cylinder 34 in which an anti-vibration rubber part 32 is vulcanized and bonded to the inner cylinder.

The facing rising piece 20A formed on the bracket 20 is provided with a flange piece 20A by burring or drawing, for example, at the facing position.
1 is provided. In the case of drawing, the bottom portion is removed so that the outer cylinder 14 can be inserted. An opening 20B for press-fitting the outer cylinder 34 of the cylindrical vibration isolator 30 is formed in the rising piece 20A that has been subjected to the burring or the drawing.
Are provided respectively.

The opening 20B constitutes a holding portion of the outer cylinder 34 continuously with the flange piece 20A1. A depression 20C is formed in a part of the opening 20B in the circumferential direction.

That is, the depression 20C is provided with the mass damper 16.
Is set equal to or slightly smaller than the plate thickness of the plate 14 in the above, and the diameter is increased from the center of the opening 20B to the outside. Therefore, this depression 20C
The plate 14 of the mass damper 16 can be inserted therein.
In the present embodiment, the plate 14 of the mass damper 16 is
As shown in FIG. 5, the bracket 20 has a flat plate shape with a length corresponding to the axial length of the bracket 20.

Since the present embodiment has the above configuration,
When assembling the anti-vibration device, dent 2 of bracket 20
The plate 14 of the mass damper 16 is inserted into 0C. Then, in this state, the outer cylinder 34 is pressed into the opening 20B.

Since the outer cylinder 34 is press-fitted into the opening 20B,
When press-fitted, as shown in FIG. 2, the plate 14 of the mass damper 16 can be pressed against the bottom surface of the recess 20C on its outer peripheral surface. Therefore, the mass damper 16
Is held between the outer cylinder 34 and the recess 20C of the bracket 20, and is held in such a manner that rattling is prevented. Further, since the movement of the plate 14 of the mass damper 16 in the recess 20C in the circumferential direction is restricted, the plate 14 is fixed at a predetermined position in the circumferential direction.

The size of the dent is determined by the mass damper 1.
In the case where the thickness is slightly smaller than the plate thickness of No. 6, since the pressure from the outer cylinder 34 acts strongly, more firm holding is performed.

The flange portion 20A1 formed on the bracket 20 is not limited to being formed over the entire circumference, but may be formed locally. In this case, the portion of the mass damper 16 where the plate 14 is located may be cut off.
A notch corresponding to the depression 20C is formed in the periphery of 0B.

According to the present embodiment, the mass damper structure need only be a simple flat plate, so that the machining cost of the mass damper does not need to be increased.

[0027]

As described above, according to the present invention, the labor required for mounting the mass damper can be simplified.
That is, the mass damper is sandwiched and fixed between the hollow and the outer cylinder provided with the vibration isolating rubber only by being inserted into the hollow formed in the bracket, so that there is no need to provide any special fixing means. In addition, since the mass damper is prevented from moving in the circumferential direction by being inserted into the recess, it can be prevented from being displaced in the circumferential direction.Therefore, the mass damper is located at a position most suitable for damping the bracket. Can be held.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an overall configuration of a vibration isolator according to the present invention.

FIG. 2 is a sectional view showing an assembled state of the vibration isolator shown in FIG.

FIG. 3 is a perspective view showing a conventional example of a vibration isolator.

[Explanation of symbols]

 Reference Signs List 10 weight 12 rubber elastic body 14 plate 16 mass damper 20 bracket 20A1 flange piece 20B opening continuous with flange piece 20C recess

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16F 15/02-15/08 F16F 1/00-3/10

Claims (4)

(57) [Scope of request for utility model registration] 1. A comprise a mass damper the weight and plate were integrated via an elastic body, having a structure in which the mass damper is mounted on a bracket to be press-fitted a tubular vibration damping member, said bracket, said cylinder A flange portion having an opening large enough to press-fit the vibration isolating member, and a recess for inserting the plate of the mass damper is formed in a part of the flange portion in a circumferential direction; The plate is inserted into the depression, and the cylindrical vibration isolating member is
A vibration isolator having a structure for holding the mass damper with the recess . 2. The method according to claim 1, wherein the diameter of the depression is increased outward from the center of the opening by an amount corresponding to the thickness of the plate than the inner diameter of the opening of the flange. Anti-vibration device. 3. The method according to claim 1, wherein the recess is expanded outward from the center of the opening by an amount slightly smaller than the thickness of the plate with respect to the inner diameter of the flange. Anti-vibration device. 4. The mass damper according to claim 1, wherein the plate is formed in a flat plate shape having a length corresponding to an axial length of the bracket, and the plate is formed substantially at the center in the longitudinal direction of the plate. A vibration isolator, wherein a weight is provided at a position via the elastic body.