JP2000145887A - Vibration isolating table for electronic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shrink the installation space, heighten the reliability upon the vibratory isolation, mounting, and quality, suppress the costs, and prolong the lifetime. SOLUTION: A vibration isolating table is equipped with a vibratory isolating rubber 2 interposed between a mounting base 4 and a chassis 5 for mounting of apparatus and having a base part 2a with the obverse and reverse surfaces parallel with the base surface 4a and chassis surface 5a and a number of projections 2b and 2c protrusive on the obverse and reverse surfaces of the base part 2a and a mounting metal fitting 3 having a boss 3a formed by insert molding on each projection 2b/2c of the rubber 2 with one side end face exposed to outside and a flange 3b in connection with the exposed end face of the boss 3a, wherein each boss 3a is provided with a threaded hole 3A opening to outside.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration proof table for an electronic device which is suitable for use when, for example, an electronic device is mounted in an aircraft.

[0002]

2. Description of the Related Art Generally, electronic equipment in an aircraft is
For the purpose of absorbing vibration, it is installed on a base via a vibration isolator. Conventionally, an anti-vibration table of this kind of electronic device is shown in FIG.
And what is shown in FIG. 8 is adopted. FIG. 9 and FIG. 10 are a front view and a side view, respectively, showing the entire vibration isolator (1) of a conventional electronic device. This anti-vibration table will be described with reference to FIGS. 9 and 10. In these figures, the anti-vibration table indicated by reference numeral 71 includes four isolators 72 each having a metal spring. The vibration isolator 71 is interposed between the base 73 and the chassis 74 by mounting screws. Note that an electronic device 75 is attached to the chassis 74.

Japanese Patent Application Laid-Open No. 7-202446 discloses a conventional vibration isolator for electronic equipment.
And those shown in FIG. 12 are also employed. FIG.
FIGS. 1 and 12 show a conventional vibration isolator (2) for electronic equipment.
3A and 3B are a side view and a cross-sectional view showing the entirety of FIG. The vibration isolator of this electronic device will be described with reference to FIGS. 11 and 12.
In these figures, a vibration isolating table denoted by reference numeral 91 includes a first vibration isolating member 92 and a second vibration isolating member 93.

[0004] The vibration isolating table 91 includes a base 94 and a chassis 95.
It is interposed between and. The base 94 has an intake / exhaust port 94.
a, and is entirely formed of a single metal or an alloy. The chassis 95 has an air intake / exhaust port 95a, and is entirely formed of a single metal or an alloy like the base 94. An electronic device 96 is attached to the chassis 95.

[0005] The first vibration isolating member 92 is provided with a concave portion (an unjoined portion for generating friction between the first vibration isolating member 92 and the base 94 and between the chassis 95 and the first vibration isolating member 92) formed on each of the front and back surfaces. ) 92a and 92b, and the whole is formed by an open-cell sponge. Then, the first vibration isolating member 92
Are provided in the base 94 and the chassis 95 in the concave portions 92a and 92a.
Except for the opening face b. Thereby, the first vibration isolating member 92 functions as an air damper or a friction damper, and absorbs vibration from the base side. The second vibration isolating member 93 has a suction / exhaust port 93a, is joined to the outer surface of the first vibration isolating member 92, and is entirely formed of a closed-cell sponge.

[0006]

However, in the former case (using an isolator), since a metal spring is used, the height dimension is increased to exhibit an effective damping function, and the cost is increased. However, there is a problem that not only is the bulk increased, but also the mounting space becomes wide. Further, the use of the metal spring induces a resonance action by elastic vibration, and the vibration to the electronic device 75 is amplified, so that there is a problem in that the reliability of vibration reduction is reduced.

On the other hand, the latter (using an open-cell sponge and a closed-cell sponge) has the following disadvantages. Since the open-cell sponge is used, each of the cells becomes extremely fine (a diameter of about 0.05 to 3 mm), and the vibration cannot be sufficiently absorbed. Since the first vibration isolating member 92 and the second vibration isolating member 93 are joined after forming (vulcanizing) the respective vibration isolating members 92, 92,
The bonding strength is low, and they are easily separated from each other after long-term use, so that a long life cannot be achieved.

When the first vibration isolating member 92 is
The pressure received in the insides 2a and 92b causes the base 94 and the chassis 95 to be separated from each other, thereby lowering the reliability in mounting. The externally exposed area of the second vibration isolation member 93 is considerably large,
The more easily it is oxidized, the lower the quality reliability. Since the first vibration isolating member 92 and the second vibration isolating member 93 are separately formed and then joined, the number of assembly steps is increased and the cost is increased.

As a vibration isolating member, a vibration isolating member 100 (100a, 100b, 100c) as shown in FIG.
Are known as bases and projections, respectively, and are intended for large and heavy equipment (heavy objects of 100 kg or more). Therefore, the anti-vibration member 100 does not have a function of mechanically fixing the target device. Therefore, simply placing the target device such as a large-sized / heavy-weight device on the anti-vibration member 100 causes the anti-vibration function. However, for example, when targeting small and lightweight electronic devices such as airborne electronic devices, the device may fall down due to vibration during use, and cannot exhibit the anti-vibration function. .

[0010] The present invention has been made in view of such circumstances, and it is possible to reduce the mounting space and to improve the reliability of vibration isolation, mounting, and quality.
Further, it is an object of the present invention to provide a vibration isolator for an electronic device which can reduce the cost and extend the life.

[0011]

According to a first aspect of the present invention, there is provided a vibration isolator for an electronic device, wherein the vibration isolator is interposed between a mounting base and a device mounting chassis. Has a base parallel to the surface of the base chassis and a number of protrusions protruding from the front and back surfaces of the base, and is attached to at least some of the protrusions of the rubber and is exposed to the outside. And a mounting hole having an end surface to be formed, and at least a part of the mounting members is provided with a screw hole that opens to the outside. Therefore, in a state where the vibration isolating rubber is attached to the mounting base and the device mounting chassis via the mounting bracket, vibration from the mounting base for the electronic device is absorbed by the vibration isolating rubber.

According to a second aspect of the present invention, in the vibration isolator for an electronic device according to the first aspect, the mounting bracket includes a boss having one end face exposed to the outside and a flange connected to the externally exposed end face side of the boss. In addition, a screw hole is provided in the boss, and the mounting bracket is insert-molded in the projection. Therefore, the mounting bracket having the boss and the flange is integrated with the vibration isolating rubber at the time of molding the vibration isolating rubber.

[0013] The invention according to claim 3 is the invention according to claim 1 or 2.
In the vibration isolator of the electronic device described above, the rear flange end surface of the flange is joined to the entire top surface of the projection. Therefore, the mounting bracket and the mounting base, and the equipment mounting chassis and the mounting bracket are integrated with each other by joining the rear flange end surface of the flange of the mounting bracket to the entire top surface of the convex portion of the vibration isolating rubber.

According to a fourth aspect of the present invention, in the vibration isolating table for an electronic device according to the first, second, or third aspect, the convex portion is formed by a cylindrical body. Therefore, the mounting bracket and the mounting base, and the device mounting chassis and the mounting bracket are integrated with each other by joining the rear flange end surface of the flange of the mounting bracket to the entire top surface of the cylindrical body of the vibration-proof rubber.

According to a fifth aspect of the present invention, in the vibration isolating table for an electronic device according to the first, second or third aspect, the convex portion is formed by a truncated cone. Therefore, the mounting bracket and the mounting base, and the device mounting chassis and the mounting bracket are integrated by joining the rear flange end face of the flange of the mounting bracket to the entire top surface of the truncated cone of the vibration-proof rubber.

According to a sixth aspect of the present invention, in the vibration isolator for an electronic device according to any one of the first to fifth aspects, the mounting base is fixed to the aircraft. Therefore, the electronic device is fixed to the aircraft via the mounting bracket between the mounting base and the electronic device mounting-side chassis and the vibration-proof rubber.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described.
This will be described with reference to the drawings. FIG. 1 is a cross-sectional view illustrating a main part of an anti-vibration table of an electronic device according to a first embodiment of the present invention, and FIG. 2 is a perspective view illustrating an entire anti-vibration table of the electronic device according to the first embodiment of the present invention. 3 and 4 are a front view and a side view showing an example of use of the vibration isolator of the electronic device according to the first embodiment of the present invention. In FIGS. 1 to 4, a vibration isolating table denoted by reference numeral 1 includes a vibration isolating rubber 2 and a mounting bracket 3.

The anti-vibration rubber 2 includes a base 2a and a projection 2b,
2c, and is interposed between the mounting base 4 and the device mounting chassis 5. The anti-vibration rubber 2 is entirely made of vulcanized rubber such as urethane rubber, butyl rubber or silicone rubber having good moldability.
As a result, vibration from the mounting base 4 with respect to the electronic device 6 is absorbed by the anti-vibration rubber 2.

The vibration-proof rubber 2 has a large elastic deformation and is reversible as compared with a metal-type isolator, and its elastic modulus is smaller than that of an isolator. Regarding the shear modulus, a metal spring made of steel was approximately 0.8 × 10 ⁶ kg / cm ^2.
In contrast, the vibration-proof rubber 2 is 5 to 30 kg / cm ² . Further, the vibration isolating rubber 2 has characteristics that can be adjusted by appropriately changing the hardness, the shape, and the dimensions.

The mounting base 4 and the equipment mounting chassis 5 are entirely formed of a single metal or an alloy. The mounting base 4 is screwed into an aircraft, for example. A small and lightweight electronic device 6 is screwed to the device mounting chassis 5.

The base 2a is formed of a single rectangular plate, and the front surface (upper surface) and the back surface (lower surface) are each a chassis surface 5a.
And a surface parallel to the base surface 4a. Convex part 2
b and 2c are formed of a large number of cylindrical bodies, and are formed continuously on the front and back surfaces of the base 2a.

The mounting bracket 3 includes a boss 3a and a flange 3
b and is insert-molded on each of the projections 2 b and 2 c of the vibration-proof rubber 2. The integration of the anti-vibration rubber 2 and the mounting bracket 3 is performed when the anti-vibration rubber 2 is vulcanized. The mounting bracket 3 has a shape other than the above, for example, each convex portion 2 of the vibration-proof rubber 2.
b, 2c It is also possible to use a cap type for covering the front end, and also to fix the mounting bracket 3 and the vibration isolating rubber 2 by fitting or using an adhesive or the like.

The boss 3a has a screw hole 3A which is open to the outside, and is formed of a cylindrical body with one end face exposed to the outside. A mounting screw (not shown) for fixing the device mounting chassis 5 and the mounting base 4 is screwed into each of the screw holes 3A of the upper and lower bosses 3a. The flange 3b is integrally formed on the externally exposed surface side of the boss 3a by exposing the front flange end surface 3B1 to the outside, and the rear flange end surface 3B2 is joined to the entire top surfaces of the convex portions 2b and 2c.

In the vibration isolator of the electronic apparatus thus configured, vibration is absorbed as shown in FIG. That is, when the vibration V is applied to the mounting base 4 from the aircraft side, the vibration is transmitted to the vibration isolating rubber 2, and a part thereof is absorbed by the base 2a and the protrusions 2b, 2c. At this time, in the convex portion 2c closest to the mounting base 4, the primary damping vibration h1 in the horizontal direction and the primary damping vibration v1 in the vertical direction
Is generated, and the primary damping vibration h1 in the horizontal direction is absorbed.

Next, the primary damping vibration v1 in the vertical direction is transmitted from the convex portion 2c to the base 2a, where the secondary damping vibration h2 in the horizontal direction and the secondary damping vibration v in the vertical direction are transmitted at the base 2a.
2, and the secondary damping vibration h2 in the horizontal direction is absorbed.
Then, the secondary damping vibration v2 is transmitted from the base 2a to the convex portion 2b, where a horizontal tertiary damping vibration h3 and a vertical tertiary damping vibration v3 occur at the convex portion 2b, and the horizontal tertiary damping vibration h3 is absorbed. Is done.

In this case, the protrusions 2b and 2c of the vibration-proof rubber 2 have extremely high vibration elastic deformation capability, and the vibration can be effectively dispersed and attenuated. In particular, since vibration in the horizontal direction is efficiently attenuated, a vibration damping function having a high damping property can be exhibited.

Therefore, in the present embodiment, the thickness (height) of the vibration isolating rubber 2 can be reduced, and the vibration against the electronic device 6 is reliably absorbed to exhibit an effective damping function. be able to. Further, in the present embodiment, the vibration isolating rubber 2 includes the base 2 a and the convex 2.
Since b and 2c are integrally formed, the occurrence of peeling of the base 2a and the protrusions 2b and 2c can be prevented, and the number of assembling steps can be reduced.

Further, in the present embodiment, the upper and lower mounting brackets 3 are provided with the equipment mounting chassis 5 by using the screw holes 3A.
And the mounting base 4 can be fixed, and a part of the vibration-proof rubber 2 can be covered by each mounting bracket 3.

In this embodiment, the anti-vibration rubber 2 is used.
The case where the mounting bracket 3 is insert-molded on all the projections 2b and 2c of the above and the screw holes 3A are provided on all the bosses 3a of the mounting bracket 3 has been described. However, the present invention is not limited to this, and as shown in FIG. Some of the projections 2a, 2
7B, the boss 3a of a part of the mounting bracket 3 may be inserted into the mounting bracket 3 as shown in FIG.
Even if the screw holes 3A are provided, the vibration damping function can be exhibited in a state where the electronic device 6 is mechanically fixed to the base side by using these screw holes 3A as in the embodiment.

Further, in the present embodiment, the anti-vibration rubber 2
The case where the projections 2b and 2c are formed by cylindrical bodies has been described, but the present invention is not limited to this. The projections 61b of the vibration-proof rubber 61 (the mounting bracket is not shown) as shown in FIG. , 61c (base 61a) may be formed in a truncated cone.

[0031]

As described above, according to the present invention, the following effects can be obtained. Since the height of the vibration isolating rubber as the vibration isolating member can be reduced, the cost can be reduced and the mounting space can be reduced. The vibration damping rubber can sufficiently and surely absorb vibrations to the electronic device and exhibit an effective damping function, so that reliability in vibration damping can be enhanced.

Since the vibration-proof rubber can be integrally formed, the joining strength between the base and the convex portion is increased, and it is possible to prevent the occurrence of peeling due to long-term use and to extend the life. Since the anti-vibration rubber can be fixed to the mounting base and the device mounting chassis by the mounting bracket, the reliability in mounting can be enhanced.

Since a part of the vibration isolating rubber can be covered by the mounting bracket, the externally exposed area of the vibration isolating rubber can be reduced accordingly, and the occurrence of oxidation can be suppressed, and the reliability in quality can be improved. Since the vibration-proof rubber can be integrally molded, the number of assembling steps can be reduced, so that the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a main part of an anti-vibration table of an electronic device according to a first embodiment of the invention.

FIG. 2 is a perspective view showing the entire vibration isolator of the electronic device according to the first embodiment of the present invention.

FIG. 3 is a front view showing an example of use of the vibration isolator of the electronic device according to the first embodiment of the present invention.

FIG. 4 is a side view showing an example of use of the vibration isolator of the electronic device according to the first embodiment of the present invention.

FIG. 5 is a cross-sectional view for explaining vibration absorption of a vibration isolator of the electronic device according to the first embodiment of the present invention.

FIG. 6 is a perspective view showing an anti-vibration table of an electronic device according to a second embodiment of the present invention.

FIG. 7 is a perspective view showing an anti-vibration table of an electronic device according to a third embodiment of the present invention.

FIG. 8 is a cross-sectional view illustrating a main part of a vibration isolator of an electronic device according to a fourth embodiment of the invention.

FIG. 9 is a front view showing the entire vibration isolator (1) of a conventional electronic device.

FIG. 10 is a side view showing the whole of a vibration isolator (1) of a conventional electronic device.

FIG. 11 is a side view showing the entire vibration isolator (2) of a conventional electronic device.

FIG. 12 is a cross-sectional view showing the whole of a vibration isolator (2) of a conventional electronic device.

FIG. 13 is a cross-sectional view showing a conventional vibration damping member.

[Description of Signs] 1 Anti-vibration base 2 Anti-vibration rubber 2a Base 2b, 2c Convex portion 3 Mounting bracket 3a Boss 3b Flange 3A Screw hole 3B1 Front flange end surface 3B2 Back flange end surface 4 Mounting base 4a Base surface 5 Equipment mounting chassis 5a Chassis surface 6 Electronic equipment

Claims (6)

[Claims] An anti-vibration rubber which is interposed between a mounting base and a device mounting chassis and has a base portion whose front and back surfaces are parallel to the base / chassis surface and a large number of projections projecting from the front and back surfaces of this base portion. And a mounting bracket attached to at least a part of the projections of the vibration isolating rubber and having an end surface exposed to the outside, and opens to at least a part of the mounting brackets to the outside. An anti-vibration base for electronic equipment, characterized by having screw holes. 2. The mounting bracket comprises a boss whose one end face is exposed to the outside and a flange connected to the externally exposed end face side of the boss, wherein the boss is provided with the screw hole, and 2. The vibration isolator according to claim 1, wherein the projection is insert-molded. 3. The vibration isolator according to claim 1, wherein a rear flange end surface of the flange is joined to an entire top surface of the projection. 4. The vibration proof table for an electronic device according to claim 1, wherein said convex portion is formed by a cylindrical body. 5. The vibration isolator according to claim 1, wherein said projection is formed by a truncated cone. 6. The vibration isolator according to claim 1, wherein the mounting base is fixed to an aircraft.