JP2010230066A - Vibration control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibration control device capable of improving heat durability without being affected by distortion on resin adhered on a core member. <P>SOLUTION: One of rigid members mounted on a vibration generation side and a vibration transmission side is the core member 2 made of a metal member, and the other is a sleeve-like member 3. One end of the sleeve-like member 3 is liquid-tightly connected to an outer peripheral face of the core member 2 by a rubber elastic body 4 surrounding the core member 2, and the other end of the sleeve-like member 3 is liquid-tightly sealed by a diaphragm 6. A liquid chamber 7 defined at least between the diaphragm and the rubber elastic body and sealing liquid is partitioned in two in the axial direction of the sleeve-like member by a partitioning member 8 into a main liquid chamber 7a and a sub liquid chamber 7b. The main liquid chamber 7a is communicated with the sub liquid chamber 7b thereof by a limit passage 9a mainly comprising a rigid member. At least a portion of the core member 2 further on the liquid chamber side than an intermediate part is covered by a resin layer 11, and a tip end portion of the core member 2 on the liquid chamber side is exposed. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention, for example, suppresses transmission of vibration of a vibration generating unit of an automobile engine or the like to a vehicle body as a vibration transmission side by deformation of a rubber elastic body and flow of an enclosed liquid, and absorbs the generated vibration. The present invention relates to an apparatus, and in particular, proposes a technique for increasing the thermal durability of the apparatus.

In this type of liquid vibration isolator, a liquid chamber that is partitioned between a diaphragm and a rubber elastic body and filled with liquid between a core member and an outer tube metal fitting is separated by a partition member between the core member and the outer tube metal fitting. In general, the main liquid chamber and the sub liquid chamber are divided into two in the axial direction, and these two liquid chambers are communicated with each other through a restriction passage.
In such an anti-vibration device, vibrations input from the vibration generating unit that connects either the core member or the outer tube fitting are absorbed by deformation of the rubber elastic body, and the liquid in the main and sub liquid chambers is also absorbed. Based on the pressure change of the liquid chamber, it will be attenuated by liquid column resonance, flow resistance, etc. by flowing between them through the restricted passage, so that the vibration transmission side connected to the other metal fitting The transmission of vibration is effectively prevented.

  However, since such a vibration isolator has a configuration in which a core member is directly attached to an engine bracket, which is made of a metal material, the heat conduction path in the vibration isolator is shown in FIG. As schematically illustrated in the plan view, heat from the engine is transmitted to the rubber elastic body 54 that provides fluid-tight communication between the core member 52 and the outer cylindrical member 53 via the engine bracket and the core member 52 and the like. The rubber elastic body 54 is easily deteriorated by the heat relatively quickly, and as a result, the rubber elastic body 54 itself may be damaged in addition to the deterioration of the vibration isolating function and the vibration damping function.

  Therefore, for example, Patent Document 1 relates to an engine mount, by covering a part of the upper surface, side surface, and lower surface of the upper mounting bracket excluding bolts on the engine bracket side with a resin layer as a heat insulating layer. There has been disclosed an engine mount that is intended to reduce the amount of heat transmitted from the bracket to the elastic body located on the lower surface of the upper mounting bracket of the engine mount, thereby suppressing the sag of the elastic body due to heat.

  However, in the engine mount described in Patent Document 1, the upper mounting bracket is integrally covered with a resin layer, so that the distortion caused by heat conduction from the engine or the like is large at the distal end portion on the entry side into the rubber elastic body. Thus, the resin layer may be peeled off by this strain.

Japanese Utility Model Publication No. 4-109242

  Then, an object of this invention is to provide the vibration isolator which can improve thermal durability, without being influenced by the distortion to the resin adhering to a core member (upper attachment metal fitting).

  In the vibration isolator according to the present invention, one of the rigid members attached to the vibration generation side and the transmission side is a core member made of a metal member, and the other is a sleeve-like member, and one end portion of the sleeve-like member Are connected to the outer peripheral surface of the core member in a liquid-tight manner by a rubber elastic body surrounding the core member, and the other end of the sleeve-like member is liquid-tightly sealed by a diaphragm so that at least the diaphragm and the rubber elastic body are The liquid chamber, which is partitioned between and encapsulated with liquid, is divided into two in the axial direction of the sleeve-like member by the partition member to divide it into a main liquid chamber and a sub liquid chamber, and a restriction mainly composed of a rigid member The main liquid chamber and the sub liquid chamber are communicated with each other by a passage, and at least the liquid chamber side of the core member is covered with a resin layer from the middle portion, and the tip portion of the core member on the liquid chamber side is covered. It is made out.

  In such a vibration isolator, more preferably, the resin layer is covered in a range of 50 to 90% of the core member.

  Preferably, the core member is mainly made of aluminum.

  In the vibration isolator of the present invention, by covering at least the liquid chamber side of the core member with the resin layer from the middle portion, the core member made of a metal member having a high thermal conductivity enters the rubber elastic body (directly under the load). The part is covered with a resin layer having a low thermal conductivity, and this resin layer functions as a heat insulating layer, and the amount of heat transferred from the engine or the like to the rubber elastic body of the vibration isolator is reduced, while the engine which is a heat source By exposing the tip of the core member on the liquid chamber side that is separated from the side, it is possible to obtain the effect of realizing cooling of the core member by the liquid in the liquid chamber located in the vicinity of the core elastic member. The effect of preventing thermal degradation can be further improved.

  In addition, since stress such as vibration deformation concentrates at the tip of the core member on the rubber elastic body on the rubber elastic body and durability is required, the metal core member and the rubber elastic body are directly and strongly strengthened. Peeling durability can be improved by vulcanization adhesion.

It is a longitudinal section showing one embodiment of the present invention. It is a perspective view of the core member of FIG. It is a longitudinal cross-sectional view which shows the core member of other embodiment of this invention. It is a longitudinal cross-sectional view which shows typically the time of heat conduction with the conventional vibration isolator.

FIG. 1 is a longitudinal sectional view of an upright vibration isolator showing an embodiment of the present invention, and FIG. 2 is a perspective view of a core member of FIG.
In FIG. 1, reference numeral 1 denotes an anti-vibration device, 2 denotes a core member made of a metal member, and 3 denotes an outer cylinder fitting as an example of a rigid sleeve-like member arranged concentrically with the core member 2.
The core member 2 includes a flange portion 2a and a core metal portion 2b. In many cases, the core member 2 is provided on the vibration generating side, for example, an automobile, or the like via a female screw portion 2c provided at the central portion of the core metal portion 2b. In many cases, the outer cylindrical fitting 3 is connected to a vibration transmitting side, for example, a vehicle body such as an automobile through a cylindrical holder (not shown).

Here, the rubber elastic body 4 having a substantially cylindrical shape is vulcanized and bonded to each of the inner peripheral surface of the outer cylindrical metal fitting 3 and the outer peripheral surface of the core member 2. A part of the liquid chamber space is partitioned by the rubber elastic body 4.
In this figure, the lower end portion of the rubber elastic body 4 is a thin portion 4a that covers the inner peripheral surface of the outer cylindrical fitting 3. However, this thin portion 4a can be omitted, and in the drawing, The lower end portion of the core member 2 is exposed from the rubber elastic body 4 with the rubber elastic body 4, but the lower end surface of the core member 2 can be covered. The upper end portion of the rubber elastic body 4 is configured to embed and cover the flange portion 2a of the core member 2, but the upper end portion may be opened and the flange portion 2a may be air-cooled from the upper surface side by air or the like. Is possible

Also, here, the diaphragm 6 made of rubber is caulked and fixed by the outer cylinder fitting 3 through the metal material 5 and the thin wall portion 4a of the rubber elastic body 4, and in the figure, this diaphragm partitioning the liquid chamber space. A liquid chamber 7 is formed by liquid-tightly sealing a required liquid such as water, silicone oil, or alkylene glycol between the rubber elastic body 4 and the rubber elastic body 4.
In the figure, the liquid in the liquid chamber 7 comes into contact with the distal end portion of the cored bar 2b of the core member 2 on the entry side into the rubber elastic body 4, but it does not have to be in contact.

  The liquid chamber 7 is divided into two in the axial direction of the outer cylinder fitting 3 by a partition member 8 made of, for example, a metal material, and is divided into a main liquid chamber 7a and a sub liquid chamber 7b.

  The two liquid chambers 7a and 7b are separated from the partition member 8, and are mainly made of a rigid member such as a metal, a thermosetting resin, or a thermoplastic resin, and the upper part is a disk shape. Communicating through a restriction passage 9 This restricting passage 9 is made of an annular rigid material whose cross-sectional shape forms a channel shape, either directly or indirectly through the thin-walled portion 4a as shown in FIG. In particular, it can be configured by caulking and fixing the outer tube fitting 3.

The upper end of the partition member 8 is constituted by a membrane 10 made of an elastic member that closes the opening of the restriction passage 9.
Although not shown in the drawing, the restriction passage 9 has a predetermined communication hole near the center of the disk shape, for example, and the communication hole allows the space between the main liquid chamber 7a and the membrane 10 to be within the liquid chamber. Liquid communicates.

  In such an anti-vibration device 1, the vibration input from the vibration generating unit connected to either the core member 2 or the outer tube fitting 3 is absorbed by the deformation of the rubber elastic body 4, and The liquid in the liquid chamber is attenuated by liquid column resonance, flow resistance, and the like caused by flowing between them through the restriction passage 9 based on the pressure change, so that the other member is vibrated. This will be sufficiently vibration-proof connected to the vibration transmission side.

  On the other hand, when high-frequency vibration is input and the restriction passage 9 becomes clogged, and the flow of the sealed liquid becomes impossible, the membrane 10 vibrates, for example, under elastic deformation. Thus, since an abnormal increase in the pressure in the liquid chamber is prevented, the anti-vibration function based on the deformation of the rubber elastic body 4 can still be exhibited, and the dynamic spring constant can be suppressed sufficiently low.

In this vibration isolator 1, the cored bar 2b of the core member 2 is further covered with the resin layer 11, and the tip 2d of the cored bar 2b of the core member 2 is exposed from the resin layer 11, preferably the resin layer 11 covers 50 to 90% of the core member 2.
As the resin layer 11, for example, polyamide, particularly nylon 6 or nylon 66 is preferable in terms of adhesion to rubber and strength.

  In such a vibration isolator 1, preferably, the resin layer 11 is covered in a range of 50 to 90% of the core member 2 to prevent heat conduction from the core member 2 to the rubber elastic body 4, and the core member. The two exposed portions can obtain a cooling effect directly or indirectly by the liquid in the liquid chamber.

  That is, if it is less than 50%, the heat conduction preventing effect from the core member 2 to the rubber elastic body 4 may be reduced. On the other hand, if it exceeds 90%, cooling of the core member 2 by the liquid in the liquid chamber is reduced. Tend to.

  The core member 2 can be made of aluminum, zinc, chromium, manganese, iron, or an alloy mainly composed of these. However, the vibration isolator 1 can be reduced in weight to increase the thermal conductivity from the engine or the like. In view of the possibility, an alloy mainly composed of aluminum is preferable.

FIG. 3 is a longitudinal sectional view showing a core member according to another embodiment of the present invention.
In this core member 22, the resin layer 31 covers the portions of the flange portion 22 a and the cored bar portion 22 b of the rubber elastic body, excluding the front end portion 22 d on the rubber elastic body, except the rubber elastic body entry side. .
With this configuration, the amount of heat transferred from the flange portion 22a to the rubber elastic body can be further reduced.

  By the way, the vibration isolator of the present invention can be not only an upright structure but also a suspended structure, but the core member is preferably connected to the engine side serving as a heat generation source.

DESCRIPTION OF SYMBOLS 1 Vibration isolator 2, 22, 52 Core member 2a, 22a Flange part 2b, 22b Core metal part 2c Female thread part 2d Tip part 3,53 Outer cylinder metal fitting 4,54 Rubber elastic body 4a Thin part 5 Metal material 6 Diaphragm 7 Liquid Chamber 7a Main liquid chamber 7b Sub liquid chamber 8 Partition member 9 Restricted passage 10 Membrane 11, 31 Resin layer

Claims (3)

One of the rigid members attached to the vibration generation side and the transmission side is a core member made of a metal member, and the other is a sleeve-like member, and one end of the sleeve-like member surrounds the core member. Is connected to the outer peripheral surface of the core member in a liquid-tight manner, and the other end of the sleeve-like member is liquid-tightly sealed with a diaphragm, and at least is partitioned between the diaphragm and the rubber elastic body to enclose the liquid. The liquid chamber is divided into a main liquid chamber and a sub liquid chamber by a partition member in the axial direction of the sleeve-like member, and the main liquid chamber and the sub liquid chamber are divided by a restriction passage mainly composed of a rigid member. A vibration isolator that communicates with
A vibration isolator formed by covering at least the liquid chamber side of the core member with a resin layer from the middle portion and exposing the tip portion of the core member on the liquid chamber side.   The vibration isolator according to claim 1, wherein the resin layer covers a range of 50 to 90% of the core member.   The vibration isolator according to claim 1 or 2, wherein the core member is mainly made of aluminum.

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