JPH112285A - Dynamic damper and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent occurrence of noise due to a collision against a peripheral member and to facilitate injection of a rubber material by forming rubber films on at least two faces of a polyhedron type mass body and connecting the rubber films together by means of a rubber joint part. SOLUTION: A mass body 3 is installed to a bracket 1 via supporting rubbers 2. By means of the supporting rubbers 2 arranged in an arm 4 of the mass body 3, the mass body 3 is connected to the bracket 1 via the supporting rubber 2 elastically. The bracket 1 is installed to the vibration source side, while the supporting rubbers 2 are arranged respectively between a flange 1A and the arm 4. Two rubber films 5 are formed on two opposed faces of the mass body 3 and connected together by means of a rubber joint part 8. In the mass body 3, a recess groove 9 is formed in the position in which the joint part 8 is formed. The rubber films 5 formed on the two faces of the mass body 3 and the joint part 8 connecting the rubber films 5 together are molded in a molding die by means of vulcanization molding when a rubber material is injected from a single injection port 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dynamic damper used as a vibration absorbing device for a steering wheel provided on a boss of a steering wheel of an automobile, for example, and a method of manufacturing the same.

[0002]

2. Description of the Related Art As a conventional dynamic damper, a mass body 100 is attached to a bracket 1 via a supporting rubber 2 as shown in FIGS. The mass body 100 is provided with a pair of arms 101.
Four supporting rubbers 2 are provided between the bracket 1 and the mass body 100, and the mass body 100 is elastically connected to the bracket 1. The mass body 100 also vibrates with the vibration, and the mass body 100
When the mass body 100 collides with the peripheral member due to the vibration, a collision sound is generated.
Is provided. Mass body 100 provided with this rubber film 102
There is also a risk that the surface opposite to the surface may collide with the peripheral member. In order to provide the rubber film 102 also on the opposite surface, as shown in FIG. In the mold 200,
Further, an injection hole 203 for vulcanizing and molding the support rubber 2,
204 was also needed.

[0003]

In the conventional structure in which the rubber film 102 is provided only on one surface of the mass body 100, the opposite surface collides with a peripheral member to generate sound, and the rubber film 102 is provided on both surfaces. There is a disadvantage that the mold becomes complicated and the manufacturing cost increases.

Accordingly, the present invention is directed to a dynamic damper which can prevent a mass body from colliding with a peripheral member to generate sound, and can easily provide rubber films on a plurality of surfaces of a polyhedral mass body, and a dynamic damper therefor. It is intended to provide a manufacturing method.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a dynamic damper in which a mass attached to a bracket attached to a vibration source via a supporting rubber is provided. A rubber film is formed on two surfaces, and these rubber films are connected by a rubber connecting portion. In addition, the bracket and the mass body are set in the rubber vulcanization molding die, the support rubber for connecting the bracket and the mass body is vulcanized, and at least two surfaces of the mass body on which the rubber film is to be formed are connected. A groove or a hole for the mass body is formed in the mass body, or a concave groove connecting the rubber film molding surfaces is formed in the mold, and the molding material is injected from only one of the rubber film molding surfaces to form the groove of the mass body. Alternatively, a molding material is caused to flow into another rubber film forming surface through a hole or a groove of a mold to vulcanize and form a rubber film on at least two surfaces, and to form a connecting portion.

[0006]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

In the embodiment shown in FIG. 1, a mass body 3 is attached to a bracket 1 via a support rubber 2 as in the prior art, and a support rubber 2 is provided on an arm 4 of the mass body 3. The mass body 3 is elastically connected to the bracket 1 via. The bracket 1 is attached to the vibration source side, and a flange 1A formed on the bracket 1 and an arm 4 are provided.
And the supporting rubber 2 is provided between the two. The mass body 3 has a polyhedron shape, and a rubber film 5 is formed on at least two surfaces (for example, front and back surfaces) of the polyhedron. Reference numeral 6 is
FIG. 1 shows a rubber material injection port provided in a vulcanization mold not shown in FIG. Reference numeral 7 denotes a similar injection port formed in a vulcanization mold for vulcanizing the support rubber 2.
Reference numeral 8 in the figure denotes a rubber film 5 of the polyhedral mass 3.
2 shows a rubber connecting portion connecting two surfaces on which a circle is formed.

FIG. 2 is a view of FIG. 1 as viewed from below. Two rubber films 5 are formed on two surfaces of the mass body 3 which is the front and back, and these rubber films 5 are connected by a rubber connecting portion 8. ing. A concave groove 9 is formed in the mass body 3 where the connecting portion 8 is formed. The rubber films 5 formed on the two surfaces of the mass body 3 and the connecting portions 8 connecting these rubber films 5 are vulcanized in a molding die by injecting a rubber material from one injection port 6. . FIG. 3 shows a cross section taken along the line AA of FIG.

FIGS. 4 and 5 are simplified diagrams showing two rubber films 5 and a connecting portion 8 provided on the mass body 3, and a concave groove 9 is formed on one surface of the mass body 3 as shown in FIG. , This groove 9
The connecting portion 8 is formed therein.

In the embodiment shown in FIGS. 6 and 7, the groove 9 is not formed in the mass body 3, but a groove 11 is formed in a molding die 10 as shown in FIG. The material flows in,
The connecting portion 8 is formed by vulcanization molding.

The shapes of the concave grooves 9 and 11 are not limited to the shapes shown in the figures, and grooves having various shapes can be implemented. In addition, the mass body 3
It is also possible to make a hole and connect the two surfaces forming the rubber film 5. Further, the molding surface of the rubber film 5 is
Are not limited to the front and back surfaces, but are surfaces that collide with peripheral members, and are at least two surfaces or more.

In order to manufacture the above-described dynamic damper, the bracket 1 and the mass body 3 are set at predetermined positions in the vulcanization mold 10, and the rubber material injection ports 6, 7 of the mold 10 are used. The mass 3 is supported on the bracket 1 by molding the supporting rubber 2 by injecting the material and vulcanizing, and the rubber film 5 is vulcanized and molded on at least two surfaces of the polyhedral mass 3. The rubber films 5 are connected by a rubber connecting portion 8. Although the number of the connecting portion 8 is one in the illustrated embodiment, two or more connecting portions may be formed.

[0013]

As described above, according to the present invention, a rubber film is formed on at least two surfaces of a polyhedral mass, and these rubber films are connected by a rubber connecting portion.
Only one injection port for forming the rubber film is required, so that the structure of the mold can be simplified and the production cost of the mold can be reduced. Further, by forming rubber films on at least two surfaces of the mass body, it is possible to prevent generation of sound due to collision with peripheral members.

[Brief description of the drawings]

FIG. 1 is a front view showing a preferred embodiment of the present invention.

FIG. 2 is a view as viewed from below in FIG. 1;

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a simplified side view showing a relationship between a mass body and a rubber film.

FIG. 5 is a front view of FIG. 4;

FIG. 6 is a side view showing another embodiment.

FIG. 7 is a front view of FIG. 6;

FIG. 8 is a front view showing a conventional example.

FIG. 9 is a diagram showing a conventional example viewed from below FIG.

FIG. 10 is a sectional view showing a conventional manufacturing method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bracket 2 Support rubber 3 Mass body 5 Rubber film 6,7 Injection port 8 Connecting part 10 Vulcanization molding die 9,11 Groove

Claims (2)

[Claims] 1. A dynamic damper in which a mass body is attached to a bracket attached to a vibration source side via a supporting rubber, a rubber film is formed on at least two surfaces of the polyhedral mass body, and a rubber film is formed between the rubber films. A dynamic damper connected by a connecting part. 2. A bracket and a mass body are set in a rubber vulcanization molding die, and a supporting rubber connecting the bracket and the mass body is vulcanized and molded, and at least two surfaces on which a rubber film of the mass body is to be formed. A concave groove or hole for connecting the rubber film is formed in the mass body, or a concave groove connecting the rubber film forming surfaces is formed in the mold, and the molding material is injected only from one of the rubber film forming surfaces. It is characterized in that a molding material is caused to flow into another rubber film forming surface through a body groove or a hole or a mold groove to vulcanize and form a rubber film on at least two surfaces and to form a connecting portion. Manufacturing method of dynamic damper.