JPH06173988A - Vibration control device - Google Patents

Abstract

PURPOSE:To surely fix a nut to a bracket by forming the bracket of a plastic material, integrally bonding a rubber to the bracket, and inserting the nut into the bracket with either surface of the nut exposed. CONSTITUTION:A rubber 3 is previously vulcanized and bonded around an inner cylinder 4, and then, it is set in an injection molding die. After a nut 1 is contained inside the die, a plastic material is injected. The rubber 3 is compressed in a state where the plastic material is cooled and solidified, and the nut 1 is inserted into a bracket 2. Since the nut 1 is inserted into the bracket 2 with at least either surface thereof exposed, it is possible to eliminate a possibility of a crack or deformation of the bracket 2 made of a plastic material, and to achieve light weight as a whole and reduction of working manhours.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration isolator such as an engine mount.

[0002]

2. Description of the Related Art As a conventional anti-vibration device, one in which rubber is integrally bonded between metal inner and outer cylinders is pressed against a metal bracket portion, or rubber is integrally bonded between the bracket portion and inner cylinder. It is known that the product has been subjected to drawing processing. And
Weld the nuts corresponding to the holes formed in the bracket part, insert the bolts into the holes of the body side mounting member and the bracket part, and screw the bolts into the nuts to mount the bracket parts to the body side. The engine side was attached to the cylinder.

[0003]

SUMMARY OF THE INVENTION In order to reduce the weight and the number of working steps, a plastic material has been used in place of the conventional metal bracket portion. When the bracket part is made of plastic, if the conventional nut mounting method is adopted, the plastic will be cracked or deformed.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a vibration damping device in which a nut can be securely attached to a bracket portion even when a plastic material is used for the bracket portion.

[0005]

In order to achieve the above object, the present invention provides a vibration isolator in which a bracket portion to which a nut is attached is molded from a plastic material, and rubber is integrally bonded to the bracket portion. At least one surface of which is exposed and is inserted into the bracket portion.

[0006]

[Function] When a plastic material is injection-molded, a nut can be insert-molded, and by setting the rubber in the mold as well, a compressive force due to the injection pressure acts on the rubber, and the rubber is used as in the past. Press fit into the bracket,
There is no need to perform drawing processing.

[0007]

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

In FIG. 1, a bracket portion 2 to which a metal nut 1 is attached is molded from a plastic material,
A rubber 3 is integrally bonded to the bracket portion 2, and an inner cylinder 4 is integrally bonded to the rubber 3. The nut 1 attached to the bracket portion 2 made of a plastic material is inserted into the bracket portion 2 with both surfaces 1A and 1B exposed. Further, an inertia body 6 is attached to the bracket portion 2 via a damper rubber 5 to serve as a dynamic damper.

The nut 1 used in this embodiment is shown in FIG.
As shown in FIG. 3, six protrusions 1C are provided at equal intervals on the circumference in the middle part of the outer peripheral surface, and the head 7A of the bolt 7 is attached to the top and bottom of the hole 1D in which the female screw is formed, and the attachment member to the body side. There are two surfaces 1A and 1B on which 8 (see FIGS. 20 and 21) are pressed. Due to the presence of the projection 1C, the nut 1 inserted into the bracket portion 2 is prevented from rotating and coming off.

The nut 1 shown in FIG. 4 has a recess 1E instead of the projection 1C, and the existence of the recess 1E prevents the nut 1 inserted in the bracket portion 2 from coming off. If the outer peripheral surface of one or both of the radially protruding portions existing above and below the recess 1E is formed in a polygonal shape, the nut 1 can be prevented from rotating.

The nut 1 shown in FIG. 5 has a projection 1C and a recess 1
An example in which E is not formed and the outer peripheral surface is circular, and indentations or serrations orthogonal to each other are formed on the outer peripheral surface of the circular shape is shown. ing.

6 to 13 show one surface 1 of the nut 1.
The nuts 1 having various shapes as viewed from the B side are shown, and such shapes can be applied to the nuts 1 as shown in FIGS. 3 and 4. The nut 1 shown in FIG. 6 shows a case where the outer peripheral surfaces of the projecting portions located on both the upper and lower sides of the recess 1E in FIG. 4 are both circular, and in this case, in order to prevent rotation, either one of the outer peripheral surfaces should be serrated. Should be given. The serrations may consist of parallel notches along the axial direction.

The nut 1 shown in FIGS. 14 and 15 has holes 1D at positions where the three disk portions are not eccentric but eccentric.
Indicates that there is.

The nut 1 shown in FIGS. 16 and 17 shows a nut having upper and lower disc portions having the same size and an intermediate portion having a disc portion having a diameter smaller than these.

The nut 1 shown in FIGS. 18 and 19 is provided with a disc portion having a maximum diameter in the middle portion.

Incidentally, a protrusion smaller than the protrusion 1C as shown in FIG. 3 may be provided on the outer peripheral surface of the nut 1 to prevent the nut 1 from rotating. Further, the bolt 7 may penetrate the nut 1 and a separate nut 9 may be screwed into the exposed bolt 7 without forming the female screw in the hole 1D (see FIG. 20).

In the case where a female screw is formed in the hole 1D of the nut 1, as shown in FIG. 21, the hole 1 of the body side mounting member 8 is formed.
The bolt 7 is inserted from 0, and the male screw portion of the bolt 7 is screwed into the hole 1D of the nut 1 inserted in the bracket portion 2.

It should be noted that at least one of both surfaces 1A and 1B of the nut 1 must be exposed to the outside when it is inserted into the bracket portion 2. If one surface is not exposed, the resin of the bracket portion 2 will slump due to contact with the mating member or the head portion 1A of the bolt 1. The means for preventing the inserted nut 1 from rotating or coming off is not limited to the illustrated embodiment.

When manufacturing the vibration isolator as shown in FIG. 1, the rubber 3 is vulcanized and adhered to the outer circumference of the inner cylinder 4 in advance, and the inner cylinder 4 and the rubber 3 are set in an injection molding die. After setting the nut 1 in the mold, the plastic material is injected. Rubber 3 by injection pressure of plastic material
Pressure is applied to. This injection pressure eliminates the conventional press-fitting of rubber into the bracket portion 2 and drawing work. When the injected plastic material is cooled and solidified, the rubber 3 is compressed and the nut 1 is inserted into the bracket portion 2. In this way, by molding the bracket portion 2 with a plastic material, it is possible to reduce the weight and the number of processing steps.

[0020]

As described above, according to the present invention, in the vibration isolator in which the bracket portion to which the nut is attached is molded from the plastic material, and the rubber is integrally adhered to the bracket portion, at least one side of the nut is provided. Since the bracket is exposed and inserted into the bracket portion, there is no fear of causing cracking or deformation of the bracket portion made of a plastic material, and the overall weight can be reduced and the number of processing steps can be reduced. Further, by fixing the nut to the rotation stop and / or the slip-off prevention, the fixation between the nut and the bracket portion is further strengthened.

[Brief description of drawings]

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

FIG. 2 is a plan view of a nut.

FIG. 3 is a cross-sectional view taken from the center of FIG.

FIG. 4 is a sectional view showing an example of another nut.

FIG. 5 is a front view showing a nut outer surface having serrations.

FIG. 6 is a bottom view of the nut.

FIG. 7 is a bottom view of the nut.

FIG. 8 is a bottom view of the nut.

FIG. 9 is a bottom view of the nut.

FIG. 10 is a bottom view of the nut.

FIG. 11 is a bottom view of the nut.

FIG. 12 is a bottom view of the nut.

FIG. 13 is a bottom view of the nut.

FIG. 14 is a cross-sectional view of a nut showing another example.

FIG. 15 is a bottom view of the nut shown in FIG.

FIG. 16 is a sectional view showing still another nut.

FIG. 17 is a bottom view of FIG.

FIG. 18 is a cross-sectional view of a nut showing another example.

FIG. 19 is a bottom view of FIG. 18.

FIG. 20 is a cross-sectional view showing a mounting example of this vibration isolator.

FIG. 21 is a sectional view showing another example of attachment.

[Explanation of symbols]

 1 Nut 1A, 1B Both sides of nut 2 Bracket part 3 Rubber

Claims (2)

[Claims] 1. A vibration-damping device in which a bracket portion to which a nut is attached is molded from a plastic material, and rubber is integrally bonded to the bracket portion, and the nut is inserted into the bracket portion with at least one surface thereof exposed. Anti-vibration device. 2. The vibration isolator according to claim 1, wherein the nut is provided with a rotation stopper and / or a stopper.