JP2608538B2 - Manufacturing method of 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, for example, a method for isolating vibrations from an engine and a method of manufacturing the vibration isolator having a dynamic damper function.

[0002]

2. Description of the Related Art As an anti-vibration device having a dynamic damper function, as shown in FIG. 10, a rubber 102 is integrally bonded between an inner cylinder 100 and an outer cylinder 101, and is press-fitted into a bracket portion 103. On the outer surface of the bracket portion 103, the one in which the damper rubber 2 is vulcanized and adhered to the mass body 1 is attached. The mass body 1 is attached to the bracket 103 using a mounting plate 104.
The damper rubber 2 is previously vulcanized and adhered to the mounting plate 1
04 was welded to the bracket 103.

However, if the bracket 103 is formed of a synthetic resin material in order to reduce the weight, mounting by welding is impossible, so that the damper rubber 2 is vulcanized to the resin bracket 103 as shown in FIG. A method of bonding was considered. In this case, rubber 1 is attached to the inner and outer cylinders 100 and 101.
02 is vulcanized and bonded, and the bracket portion 103
Are separately molded, and the outer cylinder 101 is
3, the damper rubber 2 was then vulcanized and bonded between the bracket 103 and the mass body 1.

[0004]

In the case of using a resin bracket, the steps are complicated and the cost is increased.

Therefore, it is an object of the present invention to provide a method of manufacturing an antivibration device which simplifies the process and reduces the cost.

[0006]

In order to achieve the above-mentioned object, the present invention sets a damper rubber with a mass body and a main body rubber, which have been subjected to an adhesive treatment, in an injection molding die,
A bracket is formed by injecting a resin material into a cavity in a mold to bond the main rubber to the inside and to bond the damper rubber to the outside.

[0007]

According to the present invention, both the rubber of the vibration isolating rubber and the damper rubber of the mass body are adhered to the bracket after the injection molding of the bracket, and when the bracket is removed from the mold, the vibration isolator is completed.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, a mass body 1 in which a damper rubber 2 has been vulcanized and bonded in advance is set in an injection mold 10 and a main rubber 4 which has been vulcanized and bonded to an inner cylinder 3 is set. Further, cores 11 and 12 are provided above and below the main body rubber 4 set in the mold 10. Body rubber 4 and core 1
A cavity 13 for forming the bracket portion 5 is formed on the outer circumferences of 1 and 12. Cavity 13 in mold 10
Then, a resin material is injected from the injection port 14 to bond the main body rubber 4 to the inside, and the damper rubber 2 to the outside to form the bracket portion 5.

The cores 11 and 12 are provided above and below the main rubber 4 so as not to be in close contact with the main rubber 4 but to form gaps 15 and 16 near the center of the main rubber 4. This void 1
When the resin material is injection-molded from the injection port 14 due to the presence of the injection holes 5 and 16, the injection pressure of the resin material is applied from the direction of the arrow as shown in FIG. 2, and the main rubber 4 is compressed toward the center. It At this time, the voids 15 and 16 function as escape areas for the body rubber 4. When the resin material is injected into the cavity 13, the main rubber 4 is molded in a state where initial compression strain is given by the injection pressure. The same applies to the damper rubber 2.

The surface of the body rubber 4 and the surface of the damper rubber 2 which are adhered to the bracket portion 5 are subjected to an adhesive treatment before being set in the mold 10. More specifically, an adhesive may be applied to these surfaces. In addition, the injection molding die 10
Is a mold that can be divided into upper and lower parts.

After injecting a certain amount of the resin material from the injection port 14, after waiting for the resin material to cool and harden, the vibration isolation device as shown in FIG. 3 is obtained.

In the embodiment described above, the damper rubber 2 is used.
Two molds were required for vulcanizing and molding the main body rubber 4 and the main rubber 4, respectively, but an embodiment in which only one mold is required is shown in FIG.

FIG. 4 shows a rubber product in which not only the damper rubber 2 and the main body rubber 4 but also the mass body 1 is vulcanized and molded so that the main body rubber 4 is surrounded. Both the body 6 and the portion 7 that connects the tubular body 6 and the damper rubber 2 are integrally formed of rubber. This rubber product is set in an injection molding die and a resin material is injection-molded as shown in FIG. 5. The main rubber 4 is adhered to the inside of the bracket 5 via a rubber cylinder 6 and The damper rubber 2 is adhered to the rubber.

The rubber product shown in FIG. 6 does not have the mass body 1, and is made by injection-molding a resin material at the same time when the bracket portion 5 is molded as shown in FIG.

In FIG. 8, when a rubber product as shown in FIG. 6 is vulcanized and molded, a member 1'which is a part of a separately manufactured rubber mass 1 is set in a vulcanization mold. A product similar to that shown in FIG. 4 is manufactured. This is set in an injection mold and the member 1'is wrapped with a resin material to form a mass body 1.

[0017]

As described above, according to the present invention, the damper rubber and the main body rubber are set in the injection mold, and the resin material is injected into the cavity in the mold to make the main body rubber inside. Since the bracket portion that is adhered to and the damper rubber is adhered to the outside is formed, the vibration damping device can be manufactured extremely easily. Thus, the number of steps can be omitted, the weight can be reduced, and the cost can be significantly reduced. Furthermore, the injection pressure can give an initial compressive strain to the rubber body, and the mechanical fatigue life can be improved.

[Brief description of the drawings]

FIG. 1 is a sectional view of a state in which a mass body and a main body rubber are set in a mold.

FIG. 2 is an enlarged sectional view of a portion where a core is provided above and below a main rubber.

FIG. 3 is a front view of a manufactured product.

FIG. 4 is a front view after rubber vulcanization showing another embodiment.

FIG. 5 is a front view of a product manufactured using the rubber product of FIG. 4;

FIG. 6 is a front view after rubber vulcanization showing another embodiment.

7 is a front view of a product manufactured using the rubber product of FIG.

FIG. 8 is a front view after rubber vulcanization showing still another embodiment.

9 is a front view of a product manufactured using the rubber product of FIG.

FIG. 10 is a front view of a vibration isolator showing a conventional example.

FIG. 11 is a front view of a vibration isolator showing another conventional example.

[Explanation of symbols]

 2 Damper rubber 4 Body rubber 5 Bracket part 10 Mold 13 Cavity

Claims (1)

(57) [Claims] 1. A method of manufacturing a vibration isolator in which a main body rubber is integrally adhered to a bracket portion and a mass body is attached to an outer surface of the bracket portion via a damper rubber. And a bracket portion for injecting a resin material into the cavity of the mold to adhere the main body rubber to the inside and the damper rubber to the outside, and manufacturing the vibration isolator.