JPH0314622B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a novel method for manufacturing a vibration isolating rubber in which a rubber elastic body is composited between an inner metal fitting and an outer metal fitting.

<Prior art> Conventionally, when manufacturing a vibration isolating rubber made by compounding a rubber elastic body between an inner metal fitting and an outer metal fitting, for example, a cylindrical anti-vibration bushing, it is necessary to A common method was to vulcanize and bond the rubber elastic body and then further fit it into the outer metal fitting by drawing. Another method is to vulcanize and bond the rubber elastic body to the inner cylinder metal fitting, then halogenate the adhesive part of the rubber elastic body, press-fit it to the outer metal fitting with a lubricating adhesive, and then heat and bond it. There is.

<Problems to be Solved by the Invention> However, in the former method, since the compressibility of the rubber is small, it is difficult to sufficiently remove the shrinkage strain of the rubber, and the durability is poor. It also requires an extra amount. Furthermore, even in the latter method, the halogen component used in the pre-adhesion treatment of rubber corrodes the adhesive surface of the outer metal fitting, which also causes adhesion defects during long-term use.

<Means for Solving the Problems> The present invention proposes a new method for manufacturing vibration isolating rubber that eliminates all of the above-mentioned drawbacks and can also meet the recent demands for strict anti-vibration properties for anti-vibration rubber. This is what was put out.

That is, the first feature of the present invention is to prevent the halogen component used for adhering the rubber layer from directly acting on the contact surface of the metal fitting, [1] vulcanizing and adhering the rubber layer to the outer surface of the inner metal fitting; 2] a step of vulcanizing and adhering at least a rubber layer that fits with the rubber layer on the outer surface of the inner metal fitting to the inner surface of the outer metal fitting; [3] a step of applying a halogen compound solution to the bonding surfaces of both the rubber layers; 4] Press-fitting the inner metal fitting having the rubber layer to the outer metal fitting also having the rubber layer using a lubricant or lubricating adhesive, and [5] heating the fitted body to create a gap between both rubber layers. It is manufactured by a manufacturing method that includes a step of adhering.

The second feature is that one of the fitting rubber layers is made thin in order to alleviate stress concentration on the adhesive interface between the rubber layers.

The third feature is that since the rubber layer of the inner metal fitting and the rubber layer of the outer metal fitting are vulcanized and adhesively molded separately, it is possible to easily make the rubber compositions of the two different.
For example, by combining rubber elastic bodies with different rubber hardnesses and damping characteristics, we have made it possible to meet the recent demands for strict vibration damping characteristics.

Suitable materials for the inner fitting and outer fitting in the present invention include iron, copper, aluminum, tin, and other ferrous metals, nonferrous metals, and alloys thereof, and the shape may be cylindrical, plate-like, or processed in various ways. may have been done.

Rubbers used include natural rubber, IR,
These are BR, CR, SBR, NBR, EPDM, IIR, etc., and the main components are these alone or in combination.
Naturally, vulcanizing agents, fillers, and other commonly used compounding agents are included.

Examples of halogen compound solutions used for adhesion between vulcanized rubber layers include solutions of chlorinated or brominated polymer compounds as adhesives, and solutions of sodium hypochlorite and chlorinated cyanuric acid as pretreatment agents. . Furthermore, examples of lubricants include process oil, and examples of lubricant adhesives include urethane adhesives and epoxy adhesives.

When using a primer such as sodium hypochlorite or chlorinated cyanuric acid solution for the halogen compound, use a carethane-based or epoxy-based adhesive with a lubricating adhesive. Also, when using chlorinated or brominated polymer formulations that are adhesive to halogen compounds, they are used in combination with lubricants such as simple process oils.

<Function> Vulcanized adhesive can be used for both the rubber elastic body and the metal fittings, and corrosion resistance is improved because the halogen compound does not come into direct contact with the metal fittings.

Since a halogen compound and a lubricant or lubricating adhesive are used to press-fit the rubber elastic bodies together, strong rubber adhesion can be achieved, and sufficient press-fit allowance can be taken, which improves the durability of the rubber elastic body itself. .

Furthermore, by making the rubber layer on either side of the inner fitting or outer fitting thinner, the stress concentration on the rubber layer adhesion interface can be alleviated, and by changing the material or shape of the rubber layer, the range of vibration-proofing characteristics can be changed. Expanded.

<Example> Next, a specific and detailed explanation will be given using an example.

In the anti-vibration rubber that connects the inner fitting 1 and the outer fitting 2 via the inner rubber layer 3 and the outer rubber layer 4 as shown in FIGS. 1 and 2, the outer diameter is φ60 mm, the height is 30 mm, An inner rubber layer 3 made of sulfur-vulcanized natural rubber having a hardness of 50 (in JIS-A units) was vulcanized and bonded to an inner fitting 1 made of carbon steel with a plate thickness of 3.2 mm by a conventional method. At this time, the outer diameter of the rubber on the adhesive surface was φ97 mm, and the adhesive surface before press fitting was 40 mm x 25 mm. This adhesive surface was chlorinated with a 2% solution of chlorinated cyanuric acid. On the other hand, a stopper part 5 and a thickness of 1 mm were attached to an outer metal fitting 2 made of carbon steel with an inner diameter of φ90 mm, a height of 30 mm, and a plate thickness of 3.2 mm.
An outer rubber part 4 made of sulfur-vulcanized natural rubber having a hardness of 70 (in JIS-A units) was vulcanized and bonded. The surface of the thin adhesive portion 6 was chlorinated with a 2% solution of chlorinated cyanuric acid.

A urethane adhesive made of a two-component mixture of polyether and diisocyanate was applied as a lubricant to the chlorinated rubber bonding surfaces of both of the above, and after press-fitting, a phenol alkyd resin paint was applied. Example products were prepared by heating at ℃ for 30 minutes.

As a comparative example, the thin adhesive part 6 on the outer metal fitting side of the example was removed, and therefore, instead of chlorination treatment, the adhesive metal surface of the outer metal fitting was polished and solvent degreased on the outer metal fitting side. A test product was then produced using the same manufacturing method as in the example.

For this example and comparative example, a salt spray test according to JIS Z2371 was performed for 24 hours with a strain of 6 mm in the axial direction, and then the strain was removed, and then the test was performed with an axial width of ±6 mm and a speed of 1.5 Hz. A test was conducted in which 70,000 repetitions of durability test was performed in one game cycle. As a result, the comparative example was damaged at the adhesive surface on the outer metal fitting side after 55,000 cycles of the second cycle of the durability test, whereas the example was damaged by 3 mm to 5 mm on the adhesive surface between the rubber layers on the flange side of the outer metal fitting after 3 cycles. Only deep peeling was observed. Subsequently, when an axial load was applied to this, it broke at 680 kgf. The fracture load in the axial direction before the test was 909 Kgf for the comparative row and 1069 Kgf for the example. The fracture load in the direction is 621Kg for the comparative example.
f, the example has 1106 kgf, and the fracture surface of the comparative example is 60
% of the area was covered by outer metal fittings.

Although the compression ratio due to the press-fitting of the rubber part differs slightly between the example and the comparative example, the comparative example has a compression ratio sufficient to remove distortion, and it is clear from the difference in the breaking load before and after the salt spray test. This proves the superiority of the method of the present invention, which has a rubber layer also on the adhesive surface of the outer metal fitting.

<Effects of the Invention> As is clear from the results detailed above, according to the method for producing vibration-proof rubber of the present invention, vibration-proof rubber can be produced without being affected by corrosive conditions such as salt water due to the various effects described above. The durability of the material has been greatly improved, and the result has been that it has become possible to manufacture products that can easily meet the demands for strict anti-vibration properties.

[Brief explanation of the drawing]

FIG. 1 is a plan view of the example product, and FIG. 2 is a sectional view taken along line AA in FIG. DESCRIPTION OF SYMBOLS 1...Inner metal fitting, 2...Outer metal fitting, 3...Inner rubber layer, 4...Outer rubber layer, 5...Stopper part of outer rubber layer, 6...Thin adhesive part of outer rubber layer.

Claims (1)

[Scope of Claims] 1. In the production of a vibration-proof rubber made by combining a rubber elastic body between an inner fitting and an outer fitting, [1] a step of vulcanizing and adhering a rubber layer to the outer surface of the inner fitting; 2] A step of vulcanizing and adhering at least a rubber layer that fits with the rubber layer on the outer surface of the inner metal fitting to the inner surface of the outer metal fitting; [3] A step of applying a halogen compound solution to the adhesive surface of both the rubber layers; 4] press-fitting the inner metal fitting having the rubber layer to the outer metal fitting also having the rubber layer using a lubricant or lubricating adhesive; [5] heating the fitted body to create a gap between both rubber layers. 1. A method for producing vibration-proof rubber, comprising a step of adhering. 2. The method for manufacturing vibration isolating rubber according to claim 1, wherein either one of the fitting rubber layers of the inner fitting and the outer fitting is thin. 3. The method of manufacturing a vibration isolating rubber according to claim 1, wherein the rubber layer of the inner metal fitting and the rubber layer of the outer metal fitting have different rubber compositions.