JPH07158675A - Vibration control device - Google Patents

Abstract

PURPOSE:To reduce the number of part items and machining manhours so as to reduce manufacturing cost by forming a stopper part of resin along with an outer cylinder. CONSTITUTION:An elastic body 16 made of rubber, having a connecting part 16A extended onto the outer cylinder 12 side from the periphery of an inner cylinder fitting 14 is disposed between the inner cylinder fitting 14 and the outer cylinder 12. A pair of protruding parts 20 are formed on the inner peripheral surface side of the outer cylinder 12 in such a way as to be opposed to the inner cylinder fitting 14 through an upper hole part 22 and a lower hole part 24. Accordingly, at the time of assembling a vibration control device 10, there is no need to separately manufacture a stopper 30 for limiting the displacement of the inner cylinder fitting 14, nor need of a process of fitting the stopper 30 to the outer cylinder 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration isolator that absorbs vibrations from a vibration generator, and is applicable to, for example, automobiles and general industrial machines, and is particularly suitable for engine mounts.

[0002]

2. Description of the Related Art Conventionally, it is known that an anti-vibration device as an engine mount is mounted between the body of an automobile and the engine.

An example of such a vibration isolation device is shown in FIG.
The conventional technique will be described with reference to this drawing.

As shown in this figure, this type of vibration isolator 1
The structure 10 connects an inner cylinder 112 attached to the engine side and an iron outer cylinder 114 attached to the vehicle body side with an elastic body 116 made of rubber or the like.

Therefore, in this vibration isolator 110, the inner and outer cylinders 1 generated by the vibration transmitted from the engine of the automobile.
The elastic body 116 is deformed in accordance with the relative displacement in the vertical direction between the members 12 and 114 to generate a damping force so that the vibration of the engine is absorbed and the vibration is not transmitted to the vehicle body side. Further, along with this, the stopper 120 installed on the outer cylinder 114 side suppresses the deformation of the elastic body 116 within a certain range, and prevents the inner cylinder 112 from excessively displacing.

On the other hand, when manufacturing the vibration isolator 110 as described above, as shown in FIG. 4B, metal fittings are fixed to a preformed outer cylinder 114 by welding or the like. Is deformed into a stopper shape by pressing or the like, and the stopper 120 is installed on the inner peripheral surface of the outer cylinder 114. Then, after that, the outer cylinder 114 and the inner cylinder 112 are vulcanized and bonded by the elastic body 116.

Therefore, since it is necessary to separately manufacture the metal fittings for the stopper and to attach the metal fittings to the outer cylinder or press the outer cylinder, the number of parts and working man-hours increase, and the manufacturing cost is high. It had the drawback that

Further, in the case of the vibration isolator combined with the bracket, it is necessary to provide a stopper on the outer cylinder, vulcanize the rubber, and then incorporate the vibration isolator into the bracket. The man-hour will increase.

[0009]

SUMMARY OF THE INVENTION In consideration of the above facts, the present invention provides a vibration damping device in which the stopper portion is molded with a resin together with the outer cylinder to reduce the number of parts and processing man-hours and reduce the manufacturing cost. That is the purpose.

[0010]

A vibration isolator according to the present invention comprises an outer cylinder connected to one of a vibration generating portion and a vibration receiving portion and integrally formed of resin, a vibration generating portion and a vibration receiving portion. An inner cylinder connected to the other and arranged inside the outer cylinder, and a connecting portion that connects the outer cylinder and the inner cylinder in a beam shape are provided between the outer cylinder and the inner cylinder. An elastic body to be disposed, and a convex portion formed so as to project from the outer cylinder at a position facing the inner cylinder of the outer cylinder with a space between the inner cylinder and the inner cylinder. Is characterized by.

[0011]

Since the elastic body connects the outer cylinder and the inner cylinder and the inner cylinder or the outer cylinder is connected to the vibration generator, the vibration is transmitted from the vibration generator to the inner cylinder or the outer cylinder. Then, the elastic body is deformed, and as a result, the vibration is attenuated by the deformation of the elastic body, and it becomes difficult to transmit the vibration to the vibration receiving portion side connected to the outer cylinder or the inner cylinder.

Further, the outer cylinder is integrally formed of resin, and a convex portion protruding from the outer cylinder is formed at a position facing the inner cylinder of the outer cylinder with a space therebetween. To be done.

Therefore, when manufacturing the vibration isolator according to the present invention, it is not necessary to separately manufacture a stopper for limiting the displacement of the inner cylinder, and the step of attaching the stopper to the outer cylinder is also unnecessary.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A vibration isolation device according to a first embodiment of the present invention is shown in FIGS. 1 and 2, and this embodiment will be described with reference to these drawings.

As shown in FIG. 1, a vibration isolator 1 of this embodiment.
No. 0 is provided with a cylindrical outer cylinder 12 integrally formed of synthetic resin, and the outer peripheral side of the outer cylinder 12 is fitted to the vehicle body (not shown) side of the automobile as a vibration receiving portion. . Therefore, the outer cylinder 12 is connected to the vehicle body.

Inside the outer cylinder 12, an inner cylinder fitting 14 formed in a tubular shape is arranged so as to be parallel to the axis of the outer cylinder 12, and a bolt (not shown) is screwed into the inner cylinder fitting 14. As a result, the inner tubular member 14 and the engine (not shown) that serves as the vibration generating portion are connected.

On the other hand, an outer peripheral portion 16B formed in a ring shape along the inner peripheral surface of the outer cylinder 12 is provided between the inner cylindrical metal fitting 14 and the outer cylinder 12, and the periphery of the inner cylindrical metal fitting 14 is provided. An elastic body 16 made of rubber having a pair of connecting portions 16A extending in a beam shape is provided on the outer cylinder 12 side. The outer peripheral side of the elastic body 16 is vulcanized and adhered over the entire inner peripheral surface of the outer cylinder 12, and the inner peripheral side is vulcanized and adhered to the outer peripheral surface of the inner cylinder metal fitting 14.

Therefore, in order to facilitate the displacement of the inner cylindrical metal member 14 in the vertical direction, which is the main vibration direction of the vibration isolator 10, at the upper and lower positions of the elastic body 16 sandwiching the inner cylindrical metal member 14, FIG. (A) Above, the upper hole 22 and the lower hole 24 whose longitudinal direction is the left-right direction are formed so as to extend in the axial direction of the inner tubular member 14.

Further, on the inner peripheral surface side of the outer cylinder 12, the inner cylinder metal fitting 1 is inserted through the upper hole 22 and the lower hole 24, respectively.
4, a pair of convex portions 20 is formed so as to protrude from the outer cylinder 12.

That is, the outer peripheral portion 16B of the elastic body 16 partially protrudes toward the inner cylindrical metal fitting 14 side in correspondence with the convex portion 20 of the outer cylinder 12 to form a protruding portion 26, and the convex portion 20 and the outer peripheral portion 16B are formed. The stopper 30 is configured by the protruding portion 26 of the. The stopper 30 prevents the connecting portion 16A of the elastic body 16 from being excessively deformed, and suppresses the excessive displacement of the inner tubular metal member 14 with respect to the outer tubular member 12. Therefore, the elastic body 1
Not only the durability of No. 6 is improved, but also unnecessary movement of the engine can be restricted to improve the riding comfort of the automobile.

Next, the assembly of the vibration isolator 10 according to this embodiment will be described. When assembling the vibration isolator 10, the protrusion 26 toward the inner tubular metal fitting 14 is provided with the upper hole 22 and the lower hole 2.
An elastic body 16 having an outer peripheral portion 16B and a connecting portion 16A, which are formed so as to face each other, is vulcanized and bonded around the inner tubular metal member 14. Further, as shown in FIG. 2, the inner cylindrical metal fitting 14 to which the elastic body 16 is adhered is attached to the upper mold 32A.
The outer cylinder 12 made of resin is integrally injection-molded by being inserted into the molding die 32 constituted by the lower die 32B and by injecting the resin material between the outer peripheral portion 16B and the molding die 32. It At this time, the resin material also flows into the periphery of the protruding portion 26 to form the protruding portion 20.

Further, the vibration isolator 1 completed in this way
The outer cylinder 12 of 0 is connected to the vehicle body side of the automobile, and the inner cylinder metal fitting 14 is connected to the engine through bolts.

Next, the operation of this embodiment will be described. When the engine vibration is transmitted to the inner cylinder fitting 14, the elastic body 16 is deformed and the vibration is attenuated, and the vibration transmitted to the vehicle body side connected to the outer cylinder 12 is reduced.

As shown in FIGS. 1 and 2, when the vibration isolator 10 is assembled, the outer cylinder 12 is integrally molded of a resin material, and the inner peripheral surface of the outer cylinder 12 is The convex portion 20 is formed so as to project at a position facing the tubular metal member 14 with a space defined by the holes 22 and 24 therebetween.
Therefore, when manufacturing the vibration isolator 10, it is not necessary to separately manufacture the stopper 30 that restricts the displacement of the inner cylinder fitting 14, and the step of attaching the stopper 30 to the outer cylinder 12 is also unnecessary.

Therefore, the number of parts and the number of processing steps are reduced,
It has become possible to reduce the manufacturing cost of the vibration isolation device 10.

Next, a vibration isolator according to a second embodiment of the present invention is shown in FIG. 3, and this embodiment will be described based on this drawing.
The same members as those described in the first embodiment are designated by the same reference numerals, and the duplicate description will be omitted.

As shown in FIG. 3, the anti-vibration device 1 of the present embodiment.
No. 0 has a structure in which a bracket 40, which is a conventional outer cylinder and a bracket, is arranged on the outer peripheral side.

Therefore, when assembling the vibration isolator 10, the inner cylindrical metal member 14 to which the elastic body 16 is adhered is inserted into the molding die 32 as in the first embodiment, and the resin bracket 40 is attached. Injection molding. And this bracket 4
0 is connected to the vehicle body side of the automobile, and the inner tubular metal member 14 is connected to the engine through a bolt (not shown).

From the above, as in the first embodiment, it is not necessary to separately manufacture the stopper 30, and the outer cylinder 12
Since the step of attaching the stopper 30 to the plate is unnecessary, it is possible to reduce the number of parts and the number of processing steps, and reduce the manufacturing cost of the vibration isolator 10.

In the above embodiment, the outer cylinder 12 or the bracket 40 is connected to the vehicle body side which is the vibration receiving portion, and the inner cylinder metal fitting 14 is connected to the engine side which is the vibration generating portion. The reverse configuration may be adopted.

Further, in the above embodiment, the convex portion 20 is covered with the elastic body 16, but the convex portion 20 may not be covered with the elastic body 16 and is used in the above embodiment. As the type of resin material, a thermoplastic resin other than a glass fiber reinforced polyamide resin (for example, nylon) can be used, but it is not limited thereto.

On the other hand, although the purpose of the present invention is to prevent the vibration of the engine mounted on the automobile, the vibration isolator of the present invention can be used for other purposes such as a body mount of an automobile or other uses than the automobile. Needless to say, the shapes and dimensions of the elastic body, stopper, etc. are not limited to those of the embodiment.

[0033]

As described above, the vibration isolator of the present invention has an excellent effect that the number of parts and the number of processing steps are reduced and the manufacturing cost is reduced by molding the stopper portion together with the outer cylinder with resin. Have.

[Brief description of drawings]

FIG. 1 is a view showing a vibration isolator according to a first embodiment of the present invention, in which (a) is a front view and (b) is a sectional view.

FIG. 2 is a conceptual diagram showing the manufacture of the vibration damping device according to the first embodiment of the present invention.

FIG. 3 is a front view of a vibration isolation device according to a second embodiment of the present invention.

FIG. 4 is a diagram showing a vibration isolation device according to a conventional technique,
(A) is a front view and (b) is a sectional view.

[Explanation of symbols]

 10 Vibration Isolator 12 Outer Cylinder 14 Inner Cylinder Metal Fitting (Inner Cylinder) 16 Elastic Body 16A Connecting Part 20 Convex Part 30 Stopper 40 Bracket (Outer Cylinder)

Claims (1)

[Claims] 1. An outer cylinder connected to one of the vibration generating section and the vibration receiving section and integrally molded with resin, and connected to the other of the vibration generating section and the vibration receiving section and arranged inside the outer cylinder. An inner cylinder, an elastic body disposed between the outer cylinder and the inner cylinder, the elastic body having a connecting portion that connects the outer cylinder and the inner cylinder in a beam shape, and An anti-vibration device, comprising: a convex portion that is formed so as to project from the outer cylinder at a position that is on the inner peripheral surface side and that faces the inner cylinder with a space therebetween.