JPH0752435Y2 - Anti-vibration rubber - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to an anti-vibration rubber used for a hard disk or the like of a computer.

[Prior Art] Conventionally, as a vibration-proof rubber used for a hard disk of a computer, for example, one shown in FIG. 2 is known. That is, the disc-shaped upper and lower metal fittings 21 and 23, which are vertically arranged at intervals, respectively have screw members 22 and 24,
The members to be supported 26 and the support 27 are fixed by screw members 22 and 24. The anti-vibration rubber 20 is constructed by bonding the upper and lower end surfaces facing the upper and lower metal fittings 21 and 23 to each other and providing the columnar rubber elastic body 25 having substantially the same outer diameter. Elastic body 25
As for, a low repulsion elastic rubber containing polynorbornene as a main component is generally used because it has a large loss coefficient and a small vibration transmissibility (resonance ratio Q) at a resonance frequency at room temperature and has excellent vibration damping performance. . However, the anti-vibration rubber made of low-repulsion elastic rubber containing polynorbornene as a main component has a peak of the loss coefficient near room temperature, and since this peak value is high, it exhibits an excellent anti-vibration effect. If it becomes higher or lower, there is a problem that the resonance magnification Q rapidly increases and the starting damping performance deteriorates.

On the other hand, as a vibration-proof rubber having a small temperature dependence of the resonance frequency, there is a rubber composition containing a butyl rubber or a halogenated butyl rubber as a main component. However, this type of anti-vibration rubber has a small temperature dependence of the resonance frequency, but has a small loss coefficient near room temperature and is inferior in vibration damping performance. There was a problem that I could not.

[Problems to be solved by the device]

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a vibration damping rubber that can exhibit good vibration damping performance in a wide temperature range around room temperature.

[Means for Solving the Problems]

According to the present invention, a pair of plate-shaped metal fittings that are opposed to each other at a predetermined interval, and one end of which is attached to one surface of the metal fitting,
A columnar elastic body made of a rubber composition containing polynorbornene as a main component, a plate-shaped intermediate metal fitting with one surface bonded to the other end of the elastic material, and one end bonded to the other surface of the intermediate metal fitting And a columnar elastic body made of a rubber composition whose main component is butyl rubber or halogenated butyl rubber, the other end of which is attached to the other of the metal fittings.

[Action / effect]

The anti-vibration rubber of the present invention includes an elastic body made of a rubber composition containing polynorbornene as a main component, sandwiching an intermediate metal fitting between a pair of plate-shaped metal fittings facing each other at a predetermined interval. Since the elastic body made of a rubber composition containing butyl rubber as a main component is arranged, the vibration transmissibility (resonance ratio) becomes small near room temperature due to the effect of polynorbornene. Further, even in a high temperature range above normal temperature, the vibration transmissibility (resonance magnification) does not suddenly increase due to the effect of butyl rubber. Therefore, excellent vibration damping performance can be obtained over a wide temperature range from around normal temperature to high temperature.

〔Example〕

 An embodiment of the present invention will be described with reference to the drawings.

In FIG. 1, reference numeral 1 is a vibration proof rubber of the present invention. This anti-vibration rubber 1 has disc-shaped upper metal fittings 2 and lower metal fittings 3 which are vertically spaced apart from each other, and one end of the upper metal fitting 2 is provided with one end of a columnar rubber upper elastic body 4. Vulcanized and bonded
One end of a disk-shaped intermediate metal fitting 5 is vulcanized and adhered to the other end of the upper elastic body 4, and one end of a columnar rubber lower elastic body is vulcanized and adhered to the other surface of the intermediate metal 5. The other end of the body 6 is vulcanized and adhered to the lower metal fitting 3.

The upper and lower metal fittings 2 and 3 are respectively provided with protruding screw members 7 and 8 integrally with the upper and lower metal fittings 2 and 3, respectively. The anti-vibration rubber 1 is screwed into the screw hole provided in the supported body 9 by the screw member 7 provided in the upper metal fitting 2, and the lower metal fitting 3
After the screw member 8 provided on the support body 10 is inserted into the through hole provided on the support body 10, the support body 9 is elastically supported by the support body 10 by fastening with a nut 11.

The upper elastic body 4 is formed of a rubber composition containing polynorbornene as a main component, and the lower elastic body 6 is formed of a rubber composition containing butyl rubber as a main component in a cylindrical shape. A disc-shaped intermediate metal fitting 5 is interposed between the upper and lower elastic bodies 4 and 6 to form an integral laminated structure. Upper part,
The height ratio of the lower elastic bodies 4 and 6 can be set as appropriate, but in order to obtain excellent vibration damping performance over a wide temperature range from around room temperature to high temperature, the height of the upper and lower elastic bodies 4 and 6 can be increased. It is preferable to set the ratio of the height to the range of 1: 0.7 to 1.4.

In the above embodiment, the interval between the upper and lower metal fittings is 5 mm, the columnar upper elastic body is formed to have a diameter of 9 mm and a height of 2 mm, and the columnar lower elastic body is formed to have a diameter of 9 mm and a height of 2 mm. Was bonded to both surfaces of the plate-shaped intermediate metal fitting to be interposed between a pair of plate-shaped upper and lower metal fittings to prepare a vibration-proof rubber, which was referred to as Example 1. The relation between the resonance frequency and the temperature and the relation between the resonance magnification Q and the temperature at the resonance frequency f _n were measured with the vibration proof rubber having an input acceleration of 1 G and a load of 230 gr / piece. The measurement results of the relationship between the resonance frequency and the temperature are shown in Table-1, and the measurement results of the relationship between the resonance magnification and the temperature are shown in FIG. From the result,
The anti-vibration rubber had a resonance magnification Q of 1.8 or less at a temperature of 0 to 37 ° C.

In Example 1, the height of the columnar upper elastic body is 1.7 m.
In Example 2, the columnar lower elastic body was formed to have a height of 2.3 mm. The relationship between the resonance frequency and the temperature and the relationship between the resonance magnification Q and the temperature were measured in the same manner as in Example 1, and the results are shown in Table-1 and FIG. 3, respectively.
As a result, this anti-vibration rubber has a resonance magnification Q
Was less than 1.8.

In Example 1, the height of the columnar upper elastic body is set to 2.3 m.
In Example 3, the columnar lower elastic body was formed to have a height of 1.7 mm. The relationship between the resonance frequency and the temperature and the relationship between the resonance magnification Q and the temperature were measured in the same manner as in Example 1, and the results are shown in Table-1 and FIG. 3, respectively.
As a result, this anti-vibration rubber has a resonance magnification Q at a temperature of 14 to 36 ° C.
Was less than 1.8.

Comparative Example: As Comparative Example 1, an anti-vibration rubber was prepared in the same manner as in Example 1 except that the columnar lower elastic body was replaced by the rubber composition containing polynorbornene as a main component. The relationship between the resonance frequency and the temperature and the relationship between the resonance magnification Q and the temperature were measured in the same manner as in Example 1, and the results are shown in the table.
It is shown in FIGS. 1 and 4. As a result, this anti-vibration rubber
The resonance magnification Q was 1.8 or less at a temperature of 10 to 31 ° C.

As Comparative Example 2, a vibration-proof rubber was prepared in the same manner as in Example 1 except that the rubber composition containing butyl rubber as the main component was used as the columnar upper elastic body. Example 1 shows the relationship between the resonance frequency and the temperature and the relationship between the resonance magnification Q and the temperature.
The measurement was conducted in the same manner as in, and the results are shown in Table 1 and FIG. 4, respectively. As a result, this anti-vibration rubber has a temperature of 0.
The resonance magnification Q was 1.8 or less at -25 ° C.

Conventional Example: The same construction as the above conventional vibration isolating rubber was used, except that the columnar elastic body using only NSX type rubber without the intermediate metal fitting was used in the above-mentioned Example 1. The relationship between the resonance frequency and the temperature and the relationship between the resonance magnification Q and the temperature were measured in the same manner as in Example 1, and the results are shown in Table-1 and FIG. 4, respectively. As a result, the vibration-proof rubber had a resonance magnification Q of 1.8 or less at a temperature of 15 to 34 ° C.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the anti-vibration rubber of the present invention, FIG. 2 is a sectional view of a conventional anti-vibration rubber, and FIG. 3 shows the relationship between the resonance magnification Q and the temperature of the embodiment of the present invention. FIG. 4 and FIG. 4 are views showing the relationship between the resonance magnification Q and the temperature in the conventional example and the comparative example. 1; anti-vibration rubber, 2; upper metal fittings 3, lower metal fittings, 4; upper elastic body 5; middle metal fittings, 6; lower elastic body

 ─────────────────────────────────────────────────── --- Continuation of the front page (56) Reference JP-A-63-130653 (JP, A) JP-A-57-209939 (JP, A) JP-A-2-180953 (JP, A) Actual development Sho-61- 160103 (JP, U) Actually opened 63-81390 (JP, U) Actually opened 63-72795 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A pair of plate-shaped metal fittings, which are opposed to each other at a predetermined interval, and a columnar shape made of a rubber composition containing polynorbornene as a main component and having one end bonded to one surface of the metal fitting. An elastic body, a plate-shaped intermediate metal fitting having one surface bonded to the other end of the elastic body, and one end bonded to the other surface of the intermediate metal fitting, and butyl rubber having the other end bonded to the other of the metal fittings. Alternatively, a vibration-proof rubber comprising a columnar elastic body made of a rubber composition containing halogenated butyl rubber as a main component.