JP3454588B2 - Manufacturing method of vibration isolator - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a vibration isolator used for an engine mount of an automobile.

[0002]

2. Description of the Related Art In order to reduce the weight, to facilitate the manufacturing, and to reduce the cost, there is known a method in which a main body portion surrounding an elastic body is injection-molded with a resin material. For example, as shown in FIG. 13 and FIG. 16, a metal inner cylinder 100 with an elastic body 101 vulcanized and bonded is set in an injection molding die to form a concentric circle with the inner cylinder 100, and A resin material is injected from an injection gate 103 into a cavity 102 of a mold that surrounds the body 101 to form an outer cylinder to be a main body,
The bracket is molded in the bracket molding cavity 104 that communicates with the cavity 102.

[0003]

In the conventional example shown in FIG. 13, the elastic body 1 is caused by the flow of the resin material as shown in FIG.
The tip a of 01 is caught in this flow, and after molding, the tip a is embedded in the main body (outer cylinder), the strength of the main body is reduced, and the product becomes a defective product. In addition, FIG.
When the resin material flows into the space created by the tip a being turned over as shown in (4), the movement of the elastic body after molding is restricted, which adversely affects the spring characteristics and fatigue characteristics of the elastic body itself. Further, in the conventional example shown in FIG. 16, a wrinkle as shown in FIG. 17 is generated, and the body portion of the wrinkle portion has a thin wall thickness, resulting in a decrease in strength, which is a defective product. .

Therefore, an object of the present invention is to provide a method of manufacturing an anti-vibration device in which deformation of an elastic body is prevented at the time of injection molding, strength of a main body is prevented from being lowered, and a defective rate is reduced.

[0005]

In order to achieve the above-mentioned object, the present invention provides a vibration isolator in which a resin material is injection molded to surround an elastic body having arcuate ends to form a main body. In the manufacturing method, a recess is formed on both inner surfaces of the surface of the elastic body that is set in the injection molding die and that contacts the resin material, and the recess is formed on the surface of the elastic body that contacts the resin material. Inside
Formed over the entire arc shape formed by both sides ,
A convex is formed in a mold corresponding to the concave, convex and concave of the elastic body of the mold
The fitted with one in which sets an elastic body in a mold, followed by injection to adult form the resin material into the cavity for forming the become the main body portion the outer cylinder of the mold surrounding the elastic member.

[0006]

According to the present invention, the elastic body and the metal mold are fitted in a concavo-convex shape so that the elastic body is not deformed by the flow of the resin material at the time of injection. No more worrying about. By preventing the deformation of the elastic body, the characteristics of the elastic body are not impaired and the defective rate is reduced.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings.

In the embodiment shown in FIG. 1, an elastic body 2 previously vulcanized and bonded to an inner cylinder 1 is set in an injection molding die 10. Cores 11 and 12 are provided on both sides of the elastic body 2,
A cavity 13 for forming the main body 3 is formed around the elastic body 2 and the cores 11 and 12. Further, a bracket forming cavity 14 is formed in the mold 10 so as to communicate with the cavity 13. A resin material is injected from the gate 15 into the cavity 13 in the mold 10 to adhere or contact the elastic body 2 inside, and the main body 3 and the bracket are molded. A recess 4 is formed on both inner surfaces of the surface of the elastic body 2 set in the mold 10 that contacts the resin material, and a protrusion 5 is formed at a position corresponding to the recess 4 of the mold 10. 4 and the protrusions 5 are fitted to each other to attach the elastic body 2 to the mold 1.
Set to 0. The resin material is ejected from the gate 15 in the direction of the arrow, and the portion P of the elastic body 2 tends to be turned over or wrinkled due to the flow of the resin material. Since these concave portions 4 are fitted into the convex portions 5 of the mold 10, deformation due to the flow of the resin material is prevented. FIG. 2 shows a cross section taken along the line AA of FIG. 1 and shows a state in which the main body 3 is molded by injection molding a resin material. The main body 3 is an outer cylinder. In the embodiment shown in FIGS. 1 and 2, the recess 4 formed in the elastic body 2 is formed over the entire arcuate shape formed by both inner surfaces of the surface of the elastic body 2 in contact with the resin material. .

In the embodiment shown in FIG. 3, convexes 6 are formed on both inner surfaces of the surface of the elastic body 2 that contacts the resin material.
The projection 6 is formed on most of the arc-shaped ends except for both ends. A recess 7 into which the protrusion 6 is fitted is formed at a portion of the mold 10 corresponding to the protrusion 6 of the elastic body 2. The BB line cross section shown in FIG. 3 is as shown in FIG. Also, as shown in FIG.
And concave 7. The portion of the elastic body 2 shown in FIG. 3 with the reference numeral Q tends to turn over or wrinkle due to the flow of the resin material. However, if the protrusion 6 and the concave portion 7 are fitted in this portion, the portion of the reference numeral Q of the elastic body 2 It becomes impossible for the part to move in the direction of turning over or wrinkling.

The embodiment shown in FIG. 6 shows a case where the elastic body 2 has a circular cylindrical portion 2A. In this case, a convex portion 6 as shown in FIG. 7 is formed and the projection 6 and the recess 7 are fitted together. In the case of this embodiment, the portion of the elastic body 2 denoted by R tends to wrinkle, but the convex portion 6 is formed on both surfaces of the cylindrical portion 2A of the elastic body 2, and the convex portion 6 forms the mold 1
Since it is fitted in the recess 7 of 0, the elastic body 2 does not deform in the wrinkling direction.

In yet another embodiment shown in FIG. 7, a plurality of radially extending projections 8 are formed on both inner surfaces of the surface of the elastic body 2 which comes into contact with the resin material. These projections 8 are clearly shown in FIG. 8 which is a cross section. These protrusions 8 are fitted into a plurality of recesses 9 of the mold 10. The elastic body 2 is susceptible to deformation at the location of the symbol S, but deformation is prevented because the projection 8 is fitted in the recess 9.

The embodiment shown in FIG. 9 shows an example in which in the case of the elastic body 2 having the cylindrical portions 2A, a plurality of recesses 20 are formed in these cylindrical portions 2A along the radial direction thereof, and FIG. E
The cross section is taken along line -E, and the projections 21 formed on the mold 10 fit into these recesses 20. The elastic body 2 is apt to be deformed at the position of the symbol T, but the deformation is prevented because the projection 21 is fitted in the recess 20.

The embodiment shown in FIG. 11 shows an example in which the projections 8 are formed not in the radial direction but in the circumferential direction as shown in FIG.
2 shows an example in which a plurality of recesses 20 in the embodiment shown in FIG. 9 are formed in the circumferential direction. In these embodiments, the elastic body 2 is easily deformed at the portion indicated by the reference numeral V, but the deformation is prevented by the concave and convex fitting.

[0014]

As described above, according to the present invention, the elastic body and the mold are fitted in the concave and convex portions, and the elastic body is prevented from being deformed by the flow of the injection-molded resin material. As long as the elastic body is not turned or wrinkled, the thickness of the main body does not become uneven, and the strength of the main body is guaranteed. Further, since the deformation of the elastic body is prevented, the original characteristics of the elastic body are not impaired. In addition, the defective rate of the molded product is significantly reduced.

[Brief description of drawings]

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

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

FIG. 3 is a simplified plan view showing another embodiment.

FIG. 4 is a sectional view taken along the line BB of FIG.

5 is a cross-sectional view similar to FIG. 4 showing a modification.

FIG. 6 is a simplified plan view showing still another embodiment.

FIG. 7 is a simplified plan view showing another embodiment.

FIG. 8 is a cross-sectional view taken along the line DD of FIG.

FIG. 9 is a simplified plan view showing another embodiment.

FIG. 10 is a cross-sectional view taken along the line EE of FIG.

FIG. 11 is a simplified plan view showing still another embodiment.

FIG. 12 is a simplified plan view showing another embodiment.

FIG. 13 is a simplified plan view showing a conventional example.

FIG. 14 is an enlarged partial plan view for explaining the defect of FIG.

FIG. 15 is an enlarged partial plan view for explaining the inconvenience of the conventional example.

FIG. 16 is a simplified plan view showing another conventional example.

FIG. 17 is an enlarged partial plan view illustrating a defect of the conventional example shown in FIG.

[Explanation of symbols]

2 elastic body 3 main body 4,7,9,20 concave 5,6,8,21 convex 10 Injection Mold 13 cavities

Claims (7)

(57) [Claims] 1.Has arcuate endsElastic body(2)Take
Injection molded resin material to surround the main body(3)Forming
In the method of manufacturing the vibration isolator, Injection mold(10)Elastic body set inside(2)
Concave on both inner side of the surface that comes in contact with the resin material(4)Forming
ThenThe surface of the elastic body (2) that contacts this recess (4) with the resin material
Formed over the entire arc shape formed by the inner surfaces of Elastic body(2)Concave(4)Mold corresponding to(10)Convex
(5)To form Elastic body(2)Concave(4)The mold(10)Convex(5)Fit into
Elastic body(2)The mold(10)Set inside, Then elastic body(2)Mold surrounding(10)ofBecome an outer cylinder
Form body (3)cavity(13)To resin material
InjectSuccessForming method of anti-vibration device characterized by shaping
Law. 2. A recess (4) formed in the elastic body (2).
Convex on both inner sides of the surface that contacts the resin material instead of (6)
To form this convex (6) on most of the arc-shaped excluding both ends.
Instead of the convex (5) formed on the mold (10),
The concave (7) is formed so that the convex (6) is fitted therein.
The method for manufacturing a vibration isolation device according to claim 1, wherein the vibration isolation device is a characteristic. 3. A resin material is provided so as to surround the elastic body (2).
A method for manufacturing a vibration isolation device in which the main body (3) is formed by injection molding.
In law, The elastic body (2) has a circular cylindrical portion (2A), Form a convex (6) on this cylindrical part (2A) over the entire circle.
Done, A recess that fits into this projection (6) in the injection molding die (10)
Forming (7), Fit the convex (6) of the elastic body (2) into the concave (7) of the mold (10).
And set the elastic body (2) in the mold (10), Next, it becomes the outer cylinder of the mold (10) surrounding the elastic body (2).
A resin material is used for the cavity (13) forming the main body (3).
For manufacturing a vibration isolation device characterized by injecting and molding
Law. 4. Instead of the convex (6) on the cylindrical portion (2A)
Along its radial direction Mold with multiple recesses (20)
Convex to fit concave (20) instead of concave (7) in (10)
(21) is formed, The method according to claim 3, wherein
Method of manufacturing anti-vibration device. 5. The recess (20) is circumferential rather than radial.
A plurality of protective layers according to claim 4, wherein
Method of manufacturing shaking device. 6. An elastic body (2) having arcuate ends is removed.
A resin material is injection-molded to form a main body (3)
In the method of manufacturing the vibration isolator, Elastic body (2) set in injection molding die (10)
Extends radially on both inner sides of the surface that contacts the resin material
Forming a plurality of protrusions (8), Form a concave (9) on the mold (10) to fit this convex (8)
Then Fit the convex (8) of the elastic body (2) into the concave (8) of the mold (10).
And set the elastic body (2) in the mold (10), Next, it becomes the outer cylinder of the mold (10) surrounding the elastic body (2).
A resin material is used for the cavity (13) forming the main body (3).
For manufacturing a vibration isolation device characterized by injecting and molding
Law. 7. The projections (8) are circumferential rather than radial.
The anti-vibration device according to claim 6, wherein the anti-vibration device is formed.
Manufacturing method.