JP2000291740A - Vibration isolating device and vulcanization metal mold structure thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the staying of air in a vibration isolating device using a metal fitting of deep drawing. SOLUTION: In this device, in the case that a bound stopper 1 charging inside a metal fitting of deep drawing in a 20 mm or more height with a rubber- state elastic unit is vulcanized to be molded, an air bleed hole 7 is formed in a bottom part 5 of the metal fitting 2, so as to eliminate the staying of air and bare, an annular peripheral groove 15 is formed to be opposed to the air bleed hole 7 in a bottom part 13 of a metal mold 10, so as to eliminate necessity for positioning when the metal mold is set, and at molding time so that rubber coming out from the air bleed hole 1 can be also easily cut.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-vibration device such as a bound stopper using a deep drawing metal fitting and a vulcanizing mold structure thereof.

[0002]

2. Description of the Related Art In a vibration isolator such as a bound stopper interposed between a lower arm of a vehicle suspension and a vehicle body, the bottom of a rubber-like elastic body is vulcanized and bonded inside a container-like fitting. In order to stably support a rubber-like elastic body, a deep drawing fitting having a height of 20 mm or more has been used as a container-like fitting.

[0003]

In order to form such a vibration isolator, a deep-drawing metal fitting is set in a vulcanizing mold, an unvulcanized rubber is injected into the metal fitting, and the product is vulcanized and bonded. Although it is completed, since the height of the container is high, the air caught in the rubber-like elastic body at the time of vulcanization cannot be removed, and the completed product has an air pool 102 in the rubber-like elastic body 101 in the metal fitting 100 as shown in FIG. Or a bare 104 on the wall surface of the vehicle mounting bolt hole 103 (the finished surface is rough).
Has occurred, and a phenomenon has occurred such that defective products having poor durability frequently occur. In order to solve such a phenomenon, a method of installing a vacuum pump in a mold and forcibly sucking air at the time of vulcanization to bleed air may be considered, but equipment investment is required.

[0004]

SUMMARY OF THE INVENTION According to the present invention, an air vent hole is formed at the bottom of a container-shaped metal fitting in addition to a vehicle mounting hole under the above-mentioned circumstances, so that the air vent hole is not vulcanized during vulcanization. The air is forcibly extracted to the mold side so that defective products can be eliminated.

[0005] As a container-like metal fitting requiring the formation of such an air vent hole, any metal container having a height of 20 mm or more can be applied to all containers. Approximately 50m considering cost etc.
m, it is suitable to be applied to those having a length of 20 mm to 50 mm.

[0006] The metal fitting may be a cylindrical shape with a bottom or an open surface whose diameter is larger than that of the bottom, regardless of its shape, as long as the shape is a container in which a rubber-like elastic body can be vulcanized and bonded. An inverted conical shape (tapered shape), and conversely, a conical shape having a bottom portion larger in diameter than the open surface can be exemplified.

[0007] The number and size of the air vent holes are not limited as long as the air can be reliably released during vulcanization. However, the hole diameter should be substantially the same in accordance with the thickness of the deep drawing metal fitting. Is preferred. This is because when air vent holes are formed by pressing, etc., considering the life of the press mold,
This is because a diameter equivalent to the optimum plate thickness is desirable. In particular,
When the thickness of the metal fitting is 1 to 5 mm, the diameter of the air vent hole may be set to 1 to 5 mm accordingly.

In order to reliably release the air in the metal fitting from the air vent hole, a groove must be formed in the bottom of the mold in contact with the air vent hole and both sides must face each other. If this groove is a circumferential groove formed in an annular shape with respect to the center of the metal fitting, the two will surely face each other, and positioning of the metal fitting becomes unnecessary. Another meaning of forming the circumferential groove is that rubber is simultaneously released from the air from the air vent hole during vulcanization molding, but by forming the circumferential groove, the burred cut of the protruding rubber can be easily performed. What you can do.

Although the vehicle mounting hole is usually formed at the center of the bottom of the metal fitting, a positioning protrusion is formed at the center of the bottom of the mold, and the vehicle mounting hole is fitted to the protrusion during setting. By doing so, it is possible to easily set the metal fittings.

[0010]

1 is a sectional view of a bound stopper according to an embodiment of the present invention, FIG. 2 is a plan view of a deep drawing fitting, and FIG. 3 is a sectional view of the same. As shown in the figure, an anti-vibration device 1 according to the present embodiment is a bound stopper disposed between a lower arm of a suspension of an automobile and a vehicle body, and is a container-shaped metal fitting 2 having a vehicle mounting hole at the bottom and having an open top surface. And a rubber-like elastic body 3 whose lower portion is vulcanized and bonded inside the metal fitting.

The metal container 2 is formed by forming a plate material having a thickness of 3 mm into an inverted conical shape with a bottom by deep drawing, and setting the height to 40 mm. A flange 4 is formed. In the bottom part 5 of the metal fitting, a vehicle mounting hole 6 is formed in the center part, and an air vent hole 7 is formed in the middle part. This air vent hole 7
Is stamped to a diameter of 3 mm by press working.

The rubber-like elastic body 3 is integrally formed with a filling portion 3a filled inside the container-like metal fitting 2 and two-stage stoppers 3b, 3c projecting upward from the metal fitting 2, and attached inside. An unvulcanized rubber is injected into a vulcanizing mold 10 and vulcanized by transfer or injection molding.

FIG. 4 is a plan view of a lower mold of a vulcanizing mold, and FIG. 5 is a sectional view thereof. The vulcanizing mold 10 includes a lower mold 11 and an upper mold (not shown).
The cavity 12 is formed in conformity with the external shape. At the center of the bottom 13 of the lower mold 11, a projection 14 that fits into the vehicle mounting hole 6 of the metal fitting 2 protrudes, and at a position facing the air vent hole 7, an annular peripheral groove 15 is formed. Is formed. The groove width of the peripheral groove 15 is determined by the diameter of the air vent hole (3 m
m), the width is set to 5 mm, and the groove depth is 2
It is set to about 5 mm.

When the bound stopper 1 having the above configuration is formed, when the deep drawing metal fitting 2 is set in the lower mold 11 of the vulcanizing mold 10, the air vent hole 7 located at the bottom 5 of the metal fitting 2 becomes Since it faces the circumferential groove 15 in the bottom part 13, it can be set securely without positioning the groove and the air vent hole 7. Thereafter, an unvulcanized rubber is injected by transfer molding or the like, and is heated and vulcanized. Then, the air in the metal fitting 2 is discharged together with the rubber from the air vent hole 7, and it is possible to eliminate the occurrence of air accumulation and bear inside.

After molding, the vulcanized rubber product is extracted from the mold 10 and the rubber protruding into the bottom 5 of the metal fitting 2 is cut. At this time, the rubber protruding from the bottom of the metal fitting 2 is
5, the removal operation can be easily performed, and the finish can be improved.

When a large number of the bound stoppers 1 according to the present embodiment were prototyped as the above-mentioned mold structure, the product defect rate was reduced from about 200 ppm in the past to 1 ppm or less. Also, in the vulcanizing mold, no vacuum pump equipment for bleeding air was required.

[0017]

As is apparent from the above description, according to the present invention, since the air vent hole is formed at the bottom of the deep drawing metal fitting, the generation of air accumulation and bear can be eliminated, and the vulcanizing mold can be formed. If a circumferential groove is formed in the bottom portion so as to face the air vent hole, positioning at the time of setting the mold is not required, and the rubber coming out together with the air can be easily cut, thereby improving the finish.

[Brief description of the drawings]

FIG. 1 is a sectional view of a bound stopper according to an embodiment of the present invention.

FIG. 2 is a plan view of a deep drawing fitting.

FIG. 3 is a sectional view of the same.

FIG. 4 is a plan view of a lower mold of a vulcanizing mold.

FIG. 5 is a sectional view of the same.

FIG. 6 is a sectional view of a conventional bound stopper.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bound stopper 2 Metal fitting 3 Rubber-like elastic body 4 Flange 5 Bottom 6 Vehicle mounting hole 7 Air vent hole 10 Mold 11 Lower mold 13 Bottom 14 Projection 15 Peripheral groove

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Claims (3)

[Claims] An anti-vibration device comprising: a container-shaped metal fitting having a vehicle mounting hole at a bottom portion and having an open top surface; and a rubber-like elastic body having a lower portion vulcanized and bonded inside the container-shaped metal fitting, An anti-vibration device in which the container-like fitting is formed of a deep drawing fitting having a height of 20 mm or more, and an air vent hole is formed at the bottom of the fitting. 2. The vibration isolator according to claim 1, wherein said air vent hole has a diameter substantially equal to a thickness of a metal fitting. 3. A vulcanization mold structure for vulcanizing and bonding the rubber-like elastic body according to claim 1 or 2 to a deep-drawing metal fitting, wherein the mold faces a vent hole of the deep-drawing metal fitting. Vulcanizing mold structure with a circumferential groove formed at the bottom of the mold.