JPS63225743A - Vibration isolating rubber with metal housing - Google Patents

Abstract

PURPOSE:To obtain a totally sufficient high damping performance and obtain a sufficient adhering performance on the inner and outer peripheral surfaces of a ring-like vibration isolating rubber to be adhered to inner and outer metal housings. CONSTITUTION:An inner housing 2 is adhered to an inner periphery of a vibration isolating rubber 3, and an outer housing 1 is adhered to an outer periphery of the rubber 3. The vibration isolating rubber 3 has a two-layer structure constructed of an inner member 3a and an outer member 3b. The inner member 3a is formed of a high damping material such as butyl rubber having a damping capacity of 0.2 or more at room temperature. The outer member 3b is formed of an adhesive material such as natural rubber having a degree of unsaturation of 5 mol% or more. Accordingly, an adhesive strength with a high tensile shearing strength may be obtained on both adhering surfaces of the vibration damping rubber 3 and the metal housings 2 and 1. Thus, the vibration damping rubber with the metal housings provides a sufficient high damping performance and can maintain satisfactory adhesion between the surface of the vibration rubber and the metal housing.

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Field of Industrial Application) The present invention relates to a vibration isolating rubber with a metal housing such as a damper pulley.

(Prior Art) As shown in FIG. 1, a conventionally used damper pulley is composed of an outer housing 1, an inner housing 2, and a ring-shaped rubber member 3 as a vibration isolator.

In this damper pulley, a ring-shaped rubber member 3 is press-fitted into the gap between the outer housing 1 and the inner housing 2, and the interface between the outer housing 1 and the ring-shaped rubber member 3 and the interface between the inner housing 2 and the ring-shaped rubber member 3 are Each is manufactured by bonding them together using an adhesive.

The ring-shaped rubber member 3 serving as the vibration-proof rubber is formed from a single material by molding. In addition, the material is
A high damping material is used to prevent vibrations, noise, etc., and specifically, isoprene-isobutylene copolymer rubber is used.

(Problems to be Solved by the Invention) In the above-mentioned prior art, the ring-shaped rubber member 3 made of isoprene-isobutylene copolymer rubber as the vibration-proof rubber with a metal housing has good damping properties but poor surface adhesion. The problem was that it was sufficient.

Structure of the Invention (Means for Solving the Problems) In order to solve the above problems, an internal housing is bonded to the inner periphery of the vibration isolating rubber, and an external housing is bonded to the outer periphery of the vibration isolating rubber. This is a vibration isolating rubber with a metal housing, and the vibration isolating rubber has a structure in which a high damping material is molded inside and an adhesive material is molded in two layers on the surface.

(Function) By adopting the above configuration, the vibration isolating rubber as a whole has sufficient high damping properties as a vibration isolating material, and its surface has sufficient adhesion to both the inner and outer metal housings. .

(Example) An example embodying the present invention will be described below with reference to FIGS. 1 to 3.

The anti-vibration rubber of the present invention is obtained by two-layer extrusion molding and has a two-layer structure including an inner material and a back surface material.

The inner material is a high attenuation material, and the back surface material is a material with good adhesiveness. Examples of the high-damping material used include butyl rubber, halogenated butyl rubber, silicone rubber (silicone RTV rubber), polyolefin polyol, silicone grease, and the like. Among the high damping materials, those having a damping capacity (tan δ) of 0.2 or more at room temperature are suitable from the viewpoint of damping capacity as a vibration isolating material. As an adhesive material,
Examples include rubbers with an unsaturation degree of 5 molX or more, such as styrene-butadiene copolymer rubber (SBR), natural rubber (NR), butadiene rubber (BR), and salt 8-ethylene-propylene copolymer rubber (chlorinated EPDM). Among these, SBR and NR are preferred from the viewpoint of adhesiveness. If the degree of unsaturation is less than 5 molχ, adhesiveness will decrease.

[Example 1 and Comparative Example 1.2] Next, Example 1 and Comparative Examples 1.2 will be explained.

First, the inner circumferential surface 1a of the outer housing 1 and the outer circumferential surface 2a of the inner housing 2 shown in FIG. , and then dried at 50° C. for 10 minutes. The primer used was a phenol resin/chlorinated rubber primer (Chemlock-205, manufactured by Lord Co., Ltd.), and its film thickness was 10 μm.

Next, an adhesive consisting of a main adhesive mainly composed of a chlorinated polymer, a dithiocarbamate, and a petroleum resin as disclosed in JP-A No. 61-203186 was applied to the inner periphery of the outer housing 1 coated with the above primer. It was applied to the surface 1a and the outer peripheral surface 2a of the inner housing 2 using a spray gun, and dried for 10 minutes at the same temperature of <50°C. The adhesive used was Chemlock-252 (manufactured by Lord Co., Ltd.) as the main adhesive and 100 parts by weight of the solid content of Chemlock-252, 6 parts by weight of nickel dibutyldithiocarbamate as the dithiocarbamate, and Flucol Resin F as the petroleum resin.
30 parts by weight of R-L (Fuji Kosan type) was blended, and the film thickness was 10 μm.

Next, the ring-shaped rubber member 3 as a vibration-proof rubber has a surface portion 3b shown in FIG.
The same material is represented by A in the table below), and the inside 3a is shown in the table below.
High damping material shown in 2 (the same material is designated as B in the table below)
It consists of

Table 1: Material A of the surface portion The degree of unsaturation of natural rubber is 100 molχ, and the attenuation ability (tan δ) of the back surface member A at room temperature is 0.1.

Table-2 Internal material B The degree of unsaturation of butyl rubber (polyservyl 301) is 1.6 molχ, and the damping capacity (tan δ) of internal member B at room temperature is 0.45.

Next, process oil was applied as a lubricant to the surface of the ring-shaped rubber member 3 by dipping. Next, the ring-shaped rubber member 3 coated with this process oil was inserted into the outer housing 1 at a press-fitting speed of 1001 m/win.
was press-fitted into the gap between the inner circumferential surface 1a of the inner housing 2 and the outer circumferential surface 2a of the inner housing 2. When this damper pulley is heated at 150° C. for about 30 minutes, the process oil gradually penetrates into the ring-shaped rubber member 3, the adhesive hardens, and the ring-shaped rubber member 3 is bonded to the inner peripheral surface 1a of the outer housing 1 and the inner housing 2. firmly adheres to the outer peripheral surface 2a of.

The tensile shear strength between the ring-shaped rubber member 3 of the damper pulley obtained as described above and the inner circumferential surface 1a of the outer housing 1 and the outer circumferential portion 2a of the inner housing 2 was measured using an autograph.

The results are shown in Table-3.

Table 3 From the results of the above example, the damper pulley has a damping degree of 0.4.
In addition to having a high damping capacity, the tensile shear strength between the ring-shaped rubber member 3, the inner circumferential surface 1a of the outer housing 1, and the outer circumferential surface 2a of the inner housing 2 is 52 kg/- or more, which is strong enough to destroy the base material. .

In the damper pulley, it is desirable that the ring-shaped rubber member 3 has a damping capacity of 0.2 or more and an adhesive strength of 20 kg/- or more.

[Example 2] This Example 2 is characterized in that the inside 3a of the ring-shaped rubber member 3 is made of the following high-damping material (the same material is expressed as C in the table below), and that the high-damping material and the surface of the inside 3a are The process was carried out in the same manner as in Example 1 except for the method of manufacturing the ring-shaped rubber member 3 from the adhesive material of the portion 3b.

α-gel as a damping material (CUBICE Engineering)
Ring Co., Ltd. (trade name) is a gel made of addition reaction silicone adjusted to a special crosslinked state. This is an addition reaction-curing, two-component, room-temperature-curing silicone rubber (silicone RTV rubber), which is made by mixing a vinyl group-containing silicone compound and a hydrogen-silicon-containing crosslinking agent.
Obtained by addition reaction. Its physical properties are as follows.

Attenuation ability tan δ=0.5 Cold resistance No change up to -65°C Further, as a method for manufacturing the ring-shaped rubber member 3 from the high attenuation material of the inner part 3a and the adhesive material of the surface part 3b, the following two methods are available. There are two ways.

(1) First, the adhesive material of the surface portion 3b is hollow extruded.

Next, α-gel as a high-attenuation material is injected into the inside. Next, the ends of the surface portion 3b are vulcanized and bonded, and the surface portion 3b itself is vulcanized.

(1) First, the adhesive material of the surface portion 3b is hollow extruded.

Subsequently, this is heated and vulcanized. Then, α-gel as a high-attenuation material is injected into the inside. Finally, surface part 3
Glue the ends of b with adhesive.

Note that the thickness of the interior 3a in this example is 2 m.

The thickness of the surface portion 3b is 0.5 tm.

The results of measuring the tensile shear strength between the ring-shaped rubber member 3 of the damper pulley and the inner peripheral surface 1a of the outer housing 1 and the outer peripheral part 2a of the inner housing 2 using an autograph are shown in Table 4 below.

[Example 3] This example was carried out in the same manner as Example 2, except that the inside 3a of the ring-shaped rubber member 3 was made of the following high damping material (the same material is expressed as D in the table below). Ta.

The high damping material is polytail (a low molecular weight polyolefin having a hydroxyl group at the end of the molecule, a trade name manufactured by Mitsubishi Chemical Corporation) 100jl! as a polyolefin polyol! 1 part by weight, 200 parts by weight of paraffinic process oil, and 12 parts by weight of diphenylmethane diisocyanate (MDI).

The damping capacity of this high damping material is tan δ=0.35.

The ring-shaped rubber member 3 obtained using this high-damping material has a damping capacity of tan δ=0.30.

There are two types of polytail resins, one that is wax-like solid and one that is liquid at room temperature, and both are polymers containing terminal hydroxyl groups and having a molecular weight of 1,000 to 5,000 and having a saturated hydrocarbon skeleton.

The results of measuring the tensile shear strength in this example are shown in Table 4 below.

[Example 4] This example 4 was carried out in the same manner as in example 2, except that the inside 3a of the ring-shaped rubber member 3 was made of the following high damping material (the same material is expressed as E in the table below). went.

The high attenuation material is silicone grease (trade name KS64, manufactured by Shin-Etsu Silicon Co., Ltd.).

Silicone grease is a polymeric silicone oil from dimethyldichlorosilane with lithium soap added.

The damping capacity of the ring-shaped rubber member 3 obtained using such a high damping material is tan δ=0.30.

Table 4 shows the results of measuring the tensile shear strength in this example.
Shown below.

Table 4 From the results of Examples 2 to 4 above, the damper pulley has a high damping capacity (tan δ) of 0.30 to 0.35, and the ring-shaped rubber member 3 and external housing 1
The tensile shear strength between the inner circumferential surface 1a of the inner housing 2 and the outer circumferential surface 2a of the inner housing 2 is 52 kg/cJ or more, which is strong enough to destroy the base material.

Furthermore, when α-gel is used as a high-attenuation material,
Extremely cold resistant.

Effects of the Invention The anti-vibration rubber with a metal housing of the present invention has excellent effects in that it has sufficiently high damping properties and the surface of the anti-vibration rubber has very good adhesion to the metal housing.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing the structure of a damper pulley, FIG. 2 is a sectional view of the damper pulley after a ring-shaped rubber member is attached, and FIG. 3 is a sectional view of the ring-shaped rubber member. 1... External housing, 2... Internal housing, 3
a... Inside of the ring-shaped rubber member, 3b... Surface portion of the ring-shaped rubber member

Claims (1)

[Claims] 1. A vibration isolating rubber with a metal housing, in which an inner housing (2) is bonded to the inner circumference of the vibration isolator, and an outer housing (1) is bonded to the outer circumference of the vibration isolator. The vibration isolating rubber is a vibration isolating rubber with a metal housing, in which the inner part (3a) is made of a high damping material and the surface part (3b) is made of an adhesive material. 2. The high damping material has a damping ability (tan δ) of 0.2 at room temperature.
The anti-vibration rubber with a metal housing according to claim 1, wherein the adhesive material is made of rubber having an unsaturation degree of 5 mol% or more.