JP2681690B2 - Isotropic anti-vibration equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to an isotropic vibration isolator, such as a device. More specifically, the main body of the device is protected from vibrations from all directions. The present invention relates to a device mounted on the base of a device.

BACKGROUND OF THE INVENTION Especially in the technical fields of aviation and space,
The equipment mounted on the seaplane is required to be isotropic with respect to its base in all axial directions and to be stably supported without vibration.

Isotropic vibration-proof support of the device body with respect to its base means vibration-proof performance in all directions of the three orthogonal axes set on the vibration-proof body, that is, the resonance frequency of the vibration-proof system and resonance. To equalize the vibration transmissibility.

Further, stable vibration-proof support means that when the vibration-isolated body vibrates, the vibration-proof body is supported so as to prevent the vibration of the vibration-proof body from rotating or turning due to the imbalance of the supporting means. Is.

Regarding the vibration-proof support of the above-mentioned equipment, in the conventional technology, four vibration-isolation mount devices having an isotropic characteristic are independently used to support a vibration-isolated body, and a corner vibration-isolation mount device is also used. Are arranged at positions symmetrical with respect to the center of gravity within a plane including the center of gravity of the vibration-isolated body.

Since this type of vibration isolator is not easy to design and manufacture, it has a predetermined structure as a product, and it is not possible to select and use a ready-made vibration isolator for the vibration-isolated body. It is common.

However, due to the complexity of its construction
Its characteristics are also subject to numerous restrictions. For example, if the mass of the vibration-isolated body is extremely small, select the smallest off-the-shelf vibration isolator and
Even if this is applied, there is a disadvantage that the resonance frequency cannot be lowered to a required low frequency.

In addition, according to the requirements of the equipment, when newly designing and manufacturing based on the conventional anti-vibration mounting device, in order to meet the desired requirements, theoretical calculation is used to calculate the complicated shape of the conventional device. Calculate the dimensions of each part. At that time, a complicated shape is appropriately approximated to a simple shape for calculation. In this way, it is customary to manufacture a custom vibration isolator. However, when manufactured in such a form, some errors are added to the formation site, and it is difficult to sufficiently satisfy the target characteristics. In order to reduce such an error to an acceptable range, it takes a lot of time and cost and is a problem that needs to be solved.

[Object of the Invention] In view of the above problems, a main object of the present invention is to provide an anti-vibration device for a device which has a simple structure and can be economically manufactured.

Another object of the present invention is to reduce the resonance frequency of a vibration isolation support system to a low frequency range which cannot be obtained by a conventional device when it is used in an extremely small vibration isolation body with a small mass. An object of the present invention is to provide an anti-vibration mounting device for equipment.

An object of the present invention is to provide an anti-vibration device for a device that can be easily manufactured even if the device is manufactured based on theoretical calculation as required, and the error with respect to the target characteristics is extremely small. To provide.

[Configuration of the Invention] Preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The device main body 10 having a quadrangular shape as a vibration-isolated body has a quadrangular base 12 for mounting the vibration-damped body, and a vibration-proof mount member 14 and two members 20, 22 at four corners thereof.
And a mounting assembly 16 consisting of.

To attach the device body 10 to the base 12,
Upright columns 18 are formed at each of the four corners. A first member 20 constituting the mounting assembly 18 is fixed to each of these columns 18, and a second member 22 of the mounting assembly 16 is fixed to an opposite corner of the device 10. Then, the first member 20 and the second member 22 of these mounting assemblies 16 are connected by a pair of upper and lower vibration isolation mount members 14 (FIG. 4).

As shown in FIG. 3, the vibration-proof mounting member 14 has a rubber column 24 at the center and mounting screw fittings 28 having flanges 26 at both ends in the longitudinal direction thereof.

By the way, the vibration isolation mount member 14 which is attached to the corners of the rectangular base 12 in a pair of top and bottom, a total of eight, is the device body.
The center of gravity G of 10 is arranged with a spatially symmetrical position and orientation. That is, taking the coordinate system (X, Y, Z) with the center of gravity G of the device body 10 as the origin into consideration, the direction of the vibration isolation mount member 14 is represented by the direction of the longitudinal center axis C-C of the rubber cylinder 24. , Are arranged with the following positions and orientations.

Eight vibration-proof mounting members 14 are used for all axes (X,
They are symmetric with respect to Y, Z) and are skewed at equal angles with respect to these axes.

Where the isometric angle for the axes (X, Y, Z,) is 54.736.
It corresponds to ゜.

The reason will be described in detail below. First, the tenth
With reference to FIG. 1A, consider a vector A having a length l and forming an equiangular angle α of X, Y and Z in a three-dimensional space.

The lengths of the vectors B, C, and D when these vectors are directly projected onto the coordinates X, Y, and Z are lcosα.

By the way, when the length projected onto the coordinate axes is obtained by another method, it is as follows.

As shown in FIG. 10 (2), the length of the vector E obtained by projecting the vector A on the YZ plane is lcos (90 ° −α) = lsinα. The vector E is located on the line where the plane including the x-axis and the vector A and the YZ plane intersect.

The length of the vector α obtained by projecting this vector E on the Y axis is lsinα cos 45 °.

Since this vector E matches the vector C, the following relationship holds.

From the above, the equiangular angle with respect to the X-axis, Y-axis and Z-axis is 54.7
It becomes 36 °.

Therefore, the axis C-C of each anti-vibration mount member 14 is
As shown in FIG. 4, an axis line X passing through the center of gravity G of the device body 10
In order to skew at −54.736 ° with respect to −X, the first member 20 and the second member 22 of the assembly 16 to be mounted are arranged such that the longitudinal axis CC of the rubber cylinder 24 is the same angle. Slanted surfaces 30, 31; 32, 3 so that they face each other and are parallel to each other.
Equipped with 3.

Arranging the vibration-damping mount member 14 as described above will be described more specifically.

As shown in FIG. 5, when each anti-vibration mount member 14 is projected on the plane formed by the coordinate axes Y and Z, it passes through the origin O.
Project from the origin O at equal distances on straight lines that make an angle of 45 ° with the Y and Z axes, respectively. The longitudinal center axis C-C of each anti-vibration mount member 14 is projected on a straight line forming an angle of 45 ° with the Y and Z axes.

Next, when each antivibration mount member 14 is projected onto the XY plane, as shown in FIG. 6, the axis C-C of each antivibration mount member 14 forms an angle of 45 ° with respect to the X and Y axes. The projection is made on the straight line formed at an equal distance from the origin O, but in general, in this case, the axis C-C does not pass through the origin O.

Further, when the anti-vibration mount member 14 is projected on the XZ plane, it is as shown in FIG. 7, and has the same relationship as the projection on the XY plane.

[Operation and Effect of the Invention] According to the present invention, since the device body 10 is supported by the vibration isolator as described above, it has the following features. That is, (1) the spring constants are the same in the directions of the coordinate axes X, Y, and Z. That is, as shown in FIG. 8, the spring constant is a combination of the spring constant Kc of the rubber cylinder 24 in the axis C-C direction and the spring constant Ks in the direction perpendicular to the axis C-C, that is, in the shearing direction. (Fig. 9).

(2) Since the rubber cylinder 24 is a simple cylinder, the calculation of the spring constant is easy and the calculation result is highly reliable.

(3) The device body can be supported in a balanced and stable state.

(4) The size of the vibration-proof mount member can be reduced within an allowable range of strength.

Therefore, even when the device body is lightweight, it is possible to reduce the resonance frequency to a low frequency that can be satisfied.

(5) Further, according to the present invention, the device body 10 is supported by the eight vibration-proof mount members 14 in a state of being surrounded from the skew direction. Therefore, the device main body 10 is configured so that the vibration-proof mounting member 14 can be moved against any movement in any direction.
However, due to the action, a compression force acts on the rubber cylinder 24. However, since the rubber has a high strength against a compressive force, the strength of the mounting device itself is extremely excellent.

After all, in the present invention, since the device main body 10 as the vibration-isolated body is supported by the eight vibration-proof mount members 14 in a skew method, not only is it stable in strength, but also low in isotropy. The frequency vibration isolation effect is achieved. Further, since each of the anti-vibration mount members 14 does not need to have isotropic property, it can be economically manufactured with a relatively simple shape.

[Brief description of the drawings]

FIG. 1 is a plan view showing a state in which a device body is mounted on a base by using the vibration damping device of the present invention, FIG. 2 is a front view of FIG. 1, and FIG. 3 is a vibration damping device according to the present invention. The front view of the anti-vibration mount member of the apparatus, FIG. 4 is a partial sectional view taken along the line IV-IV of FIG. 1 as seen in the direction of the arrow, and FIGS. 5 to 7 show the arrangement of the anti-vibration mount member on the coordinate plane. Schematic diagram projected and explained on
8 and 9 are schematic diagrams for explaining the calculation of the spring constant of the antivibration mount member, and FIGS. 10 (1) and 10 (2) show that the antivibration mount member of the present invention has coordinate axes. X, Y,
FIG. 11 is a schematic view for explaining that Z is equally skewed at an angle of 54.736 °, and FIG. 11 is a perspective view showing the entire structure of the vibration isolator. The main reference numerals in the drawings are listed below. 10 …… Equipment body 12 …… Base 14 …… Anti-vibration mount member 16 …… Mounting assembly 18 …… Strut 20 …… 16 first member 22 …… 16 second member 24 …… Rubber cylinder 28 …… Mounting bracket 30,31,32,33 …… Sloping surface

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Yasuhiko Fukumoto 1-21-6 Dogenzaka, Shibuya-ku, Tokyo Nihon Aviation Electronics Industry Limited (56) References Japanese Patent Laid-Open No. 53-20250 (JP, A) Kosho 31-6911 (JP, B1)

Claims (3)

(57) [Claims] 1. A quadrangle base on which a rectangular device body is mounted is provided with upright columns at respective corners, and a first member for supporting a pair of upper and lower vibration isolation mount members inside each of the columns. And a second member is fixed, and a longitudinal axis of the vibration isolation mount member is attached to the first member and the second member of the mounting assembly. An isotropic vibration isolator, which is supported in a skew direction equiangular with respect to a coordinate axis orthogonal to the center of gravity of the. 2. A metal fitting for fixing the anti-vibration mount member to each of the first and second members of the mounting assembly, and a rubber cylinder arranged between the both fittings. The apparatus according to Item 1. 3. A first member and a second member of the mounting assembly for supporting the anti-vibration mount member in a skew direction equiangular to coordinate axes orthogonal to each other through a center of gravity of the device body. An apparatus according to claim 1, wherein the inclined support surfaces are provided on and.