JP2013079703A - Vibration isolating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration isolating device that saves a space in a height direction and has high vibration isolating performance.SOLUTION: A vibration isolating device 1 includes: a ring-like base 2; a plate-like first spring 3 having a plurality of strip pieces 13 extending radially and engaged with the base at the tip of each strip piece; a support column 4 fixed to the center of the first spring; a plate-like second spring 5 fixed to the support column at the center and having a plurality of strip pieces extending radially from the center; a plurality of wires 6 each engaged with the tip of each strip piece of the second spring at the upper end and extending downward; a floating member 7 hung at lower ends of the wires; connecting members 8 connected to the floating member and extending upward; and a placing member 9 connected to upper ends of the connecting members.

Description

  The present invention relates to a vibration isolator that prevents transmission of vibration between a floor surface and equipment.

Patent Document 1 describes an anti-vibration rubber attached to a leg portion of a washing machine.
Further, Patent Document 2 discloses that a vibration generated by itself such as a washing machine or a speaker is prevented from being transmitted from the floor surface to another device, or a DVD player or the like (including a CD player, a record player, etc.) from the floor surface. A vibration absorbing device for preventing vibration from being transmitted to the audio equipment from the outside is described. The vibration absorbing device includes a support body placed on the floor surface, and the upper ends of four wires are locked to the support body. A tip of a cross-shaped leaf spring is suspended from the lower end of the wire. A support shaft extends upward from the central portion of the leaf spring, and a support base on which an acoustic device or the like is placed is fixed to the upper end of the support shaft.

  As another device, there is a vibration isolation device of Patent Document 3. The vibration isolator includes an outer case. A suspension member whose upper end is locked via a spring member is disposed in the outer case. An inner case is suspended from the lower end of the wire. A base for installing precision machinery is attached to the inner case.

JP 2001-58094 A JP 59-19739 A JP-A 63-195445

  Since the anti-vibration leg device of the washing machine of Patent Document 1 is a rubber mount, it is difficult to absorb vibration with a large swing width. In the vibration absorbing device of Patent Literature 2 and the vibration isolating device of Patent Literature 3, the spring material can be bent downward to some extent by the weight of the equipment to be mounted, and the upward displacement can be absorbed by the amount of the bending. . For this reason, if the displacement in the height direction due to vibration exceeds the amount of deflection due to its own weight, the vibration isolation capability is lost. On the other hand, if the deflection due to its own weight is increased so that a large amplitude can be absorbed in the height direction, the displacement of the spring increases, and the device becomes bulky in the height direction.

  Accordingly, an object of the present application is to provide a vibration isolator that is space-saving in the height direction and has high vibration-proof performance.

  The vibration isolator of the present invention (Claim 1) has a ring-shaped base and a plurality of strips extending radially, and a plate-like first spring in which the tips of the strips are locked to the base. A plate-like second spring having a plurality of strips that are fixed to the center portion of the first spring, the center portion being fixed to the column, and extending radially from the center portion; A plurality of wire rods whose upper ends are locked to the tips of the respective strip pieces of the spring, respectively extending downward, a float member suspended from the lower ends of those wire rods, and a connecting member coupled to the float member and extending upward The mounting member is connected to the upper end of the connecting member.

In such a vibration isolator, it is preferable that the first spring and / or the second spring is formed by stacking a plurality of leaf springs (Claim 2).
In addition, it is preferable that the strips of the first spring and the second spring have the same number and are alternately arranged in a plan view.
Furthermore, it is preferable that the center portion of the first spring is fixed to the support column above the center portion of the second spring.
It is preferable that the center portion of the first spring is fixed to the support column below the center portion of the second spring.

The vibration device according to the present invention (Claim 1) is supported in a state in which the mounting member floats from the base via the float member. Since the float member is suspended from the wire extending from the tip of the second spring, the pendulum motion can be performed with the upper end of the wire as a fulcrum. For this reason, the freedom degree with respect to the movement of a mounting member in the substantially horizontal direction is high. Moreover, tension | tensile_strength is provided to the 2nd spring and the 1st spring by the dead weight of the apparatus mounted in the mounting member at the wire. For this reason, the pendulum motion can be maintained even if a vertically upward component of vibration is added. In addition, the vertical component of vibration can be attenuated by the elasticity of the second spring and the first spring.
The first spring and the second spring are plate-like, and their horizontal planes are substantially parallel. For this reason, the apparatus is not bulky in the height direction. In addition, since the first spring and the second spring are connected in series via the support column, the combined spring constant is small. For this reason, the vibration-proof performance of the vibration of a height direction is high.

  In such a vibration isolator, when the first spring and / or the second spring is formed by overlapping a plurality of leaf springs (Claim 2), by increasing or decreasing the number of leaf springs, The spring constant can be changed according to the vibration characteristics.

  Further, when the strips of the first spring and the second spring are the same number and are alternately arranged in plan view (Claim 3), even if the first spring and the second spring are bent, the springs are bent. They do not interfere with each other. Further, the wire or the connecting member can be extended upward without being obstructed by the leaf spring.

  Furthermore, when the center part of the first spring is above the center part of the second spring and is fixed to the column (Claim 4), when the device is placed on the placing member, the first spring and the second spring Since the spring bends in the opposite direction, their interference can be prevented.

  When the central portion of the first spring is below the central portion of the second spring and is fixed to the support column (Claim 5), when the device is placed on the placement member, the first spring and the second spring Since the spring bends to the same side, the dimension in the height direction can be further reduced.

FIG. 1a is a plan view showing an embodiment of the vibration isolator of the present invention, and FIG. 1b is a cross-sectional view taken along the line II of FIG. 1a. Fig. 2a is a schematic front view showing an example of the audio equipment according to the present invention, Fig. 2b is a bottom view of Fig. 2a, and Fig. 2c is a schematic front view showing another example of the audio equipment. FIG. 3 is a plan view showing a first spring in the vibration isolator of FIG. 4a is a perspective view of the end fixing member, and FIG. 4b is a cross-sectional view taken along the line II-II of FIG. 4a. FIG. 5 is a partial cross-sectional schematic view showing a state in which the spring member of the vibration isolator of FIG. 1B is bent. FIG. 6 is a partially enlarged cross-sectional view showing a state of the end fixing member when the device is placed on the vibration isolator of FIG. 1b. 7a is a cross-sectional view showing another embodiment of the vibration isolator of the present invention, and FIG. 7b is a cross-sectional view showing a state in which the vibration isolator of FIG. 7a is bent.

  First, the manner in which the vibration isolator of the present invention is used will be described with reference to FIG. The vibration isolator 1 is disposed between the device 29 and the floor surface 28. It is preferable that the vibration isolator 1 is arranged at substantially equal intervals around the outer edge of the lower surface of the device 29 so as to support the weight of the device 29 in a balanced manner. Specifically, it is preferable to arrange in the vicinity of the corners (four corners) of the lower surface of the device 29.

In FIG. 2b, four vibration isolation devices 1 are arranged. However, the number may be three. In the case of using three, it is preferable to arrange so that the lower surface of the device 29 is located at the apex of an equilateral triangle or an isosceles triangle. When the number is four or more, they can be arranged at equal intervals along the outer periphery of the lower surface of the device 29 or can be arranged near the center of the lower surface. In the case of two, it is preferably used for the device 29 having an elongated lower surface, and in the case of one, the device 29 is preferably arranged at a position corresponding to a position substantially below the center of gravity of the small device 29.
In addition, when the support leg 30 is provided in the lower surface of the said apparatus 29 as shown in FIG. 2c, the vibration isolator 1 is arrange | positioned on the lower surface of each support leg 30. FIG.

  Examples of the device 29 include devices that generate vibrations such as washing machines and speakers, and devices that receive vibrations from other devices such as players (CDs, DVDs, records), and amplifiers. In addition, precision instruments such as personal computers, measuring instruments, and microscopes, and art objects such as paintings and sculptures may be placed.

  Next, the vibration isolator 1 will be described with reference to FIGS. 1a and 1b. The vibration isolator 1 includes a base 2 placed on a floor surface 28 (see FIG. 2a). Near the upper end of the base 2, the tip of the first spring 3 made of a cross-shaped leaf spring is locked. The central portion of the first spring 3 is fixed near the upper end of the column 4. A center portion of a second spring 5 made of a cross-shaped leaf spring is fixed to the lower end of the column 4. The second spring 5 is disposed substantially parallel to the first spring 3. The upper end of the wire 6 is locked to the tip of the second spring 5. The wire 6 extends vertically downward, and a float member 7 is suspended from the lower end of the wire 6. A connecting member 8 is connected to the float member 7. The connecting member 8 extends upward, and the mounting member 9 is connected to the upper end thereof. A lid 2a is provided at the opening of the base 2 (see FIG. 1b). In FIG. 1a, the lid 2a and the mounting member 9 are not shown in order to show the inside.

  The base 2 has a bottomed cylindrical shape opening upward, and a fixing portion 10 for fixing the tip of the first spring 3 is provided in the vicinity of the opening end. The fixing portion 10 is a recess into which the tip of the first spring 3 is fitted. In the present embodiment, four fixing portions 10 are provided at equal intervals in the circumferential direction in the cylinder. The distal end of the first spring 3 may be locked to the fixed portion 10. Moreover, although the base 2 of this embodiment has a bottom, it may not have a bottom. Further, an attachment portion with the floor surface 28 may be provided on the outer periphery of the base 2 so as to be fixed to the floor surface 28. Although not shown, a lid is fixed to the upper surface of the fixing portion 10 in order to maintain the fitted state of the tip of the first spring 3.

The first spring 3 is a leaf spring 11 formed in a cross shape or a plurality of the leaf springs 11 stacked. As shown in FIG. 3, the first spring 3 has a central portion 12 and four strips 13 extending radially from the central portion 12 at an equal angle. A central hole 14 is formed in the central portion 12. In addition, the first spring 3 and the second spring 5 are designed to share parts, and a long hole 15 through which the wire 6 is passed when used as the second spring 5 is formed at the tip of each strip 13. Yes. The long diameter of the long hole 15 extends in the axial direction of the strip 13. Two or more strip pieces 13 are provided, preferably three or more. This is because the support of the support column 4 (see FIG. 1b) is stable when the number is three or more.
Note that the four strips 13 may be separated from each other at the central portion 12 without being integrated.
Referring back to FIG. 1b, the plate spring 11 has a plate thickness of 0.2 to 1 mm, preferably 0.4 to 0.6 mm. The number of the leaf springs 11 is 2 to 15, preferably 6 to 12. The first spring 3 can be made of metal, synthetic resin, or the like, and is preferably made of spring stainless steel such as SUS301-CSP, spring steel, or phosphor bronze.

  The second spring 5 has substantially the same shape as the first spring 3. The first spring 3 and the second spring 5 may be separate parts, and the number of strips 13 and the number of leaf springs 11 may be different. The strips 13, 13 of the first spring 3 and the second spring 5 extend radially at an equal angle in plan view (see FIG. 1a), and the strips 13 are arranged alternately. ing.

  The column 4 is a rod-shaped or disk-shaped (washer) member. A through hole 16 (see FIG. 1b) is formed at the center. Bolts 17 pass through the through holes 16 from the lower end side. A central portion 12 of the first spring 3 is disposed on the upper end surface of the support column 4, and a central portion 12 of the second spring 5 is disposed on the lower end of the support column 4. The bolts 17 pass through the respective central holes 14 and 14 (see FIG. 3) of the first spring 3 and the second spring 5, and nuts 18 are screwed into portions protruding from the upper ends of the columns 4. It is fixed integrally.

The wire 6 is a stranded metal wire. In addition, you may use chemical fibers, such as natural fiber and synthetic resin, such as cotton and silk. A single wire may be used, but a stranded wire may be used to increase the strength.
The wire 6 has an upper end locked in the elongated hole 15 of the second spring 5 and a lower end locked in the float member 7. Ends 19 having a diameter larger than the diameter of the wire 6 are fixed to the upper and lower ends of the wire 6 by caulking. The upper end 19 protrudes beyond the long hole 15 of the second spring 5 and is locked to the second spring 5 via the end fixing member 20.

  When the length of the wire 6 is L and the gravitational acceleration is g, the natural frequency f = (1 / 2π) · √ (g / L). Thus, the natural frequency f is independent of the weight of the acoustic device and is determined by the length L of the wire 6. Therefore, the length L of the wire 6 is preferably set to a certain length, for example, 10 mm or more in consideration of the lower limit value of the human audible frequency.

As shown in FIG. 4a, the end fixing member 20 is placed on the upper surface near the tip of the second spring 5 (see FIG. 1a). The end fixing member 20 has a plate-like top portion 21 placed on the upper surface of the second spring 5, and a side that extends downward from both side edges of the top portion 21 and is arranged near the side edge of the second spring 5. Part 22.
As shown in FIG. 4 b, the inner surface of the top portion 21 is inclined upward from the proximal end of the strip 13 toward the distal end. The inclined surface is an inclined inner surface 23.
A cylindrical portion 24 protrudes from the lower surface of the top portion 21. The cylindrical portion 24 is passed through the long hole 15 (see FIG. 3) of the second spring 5 and moves in the long axis direction in the long hole 15 or tilts the cylindrical portion 24 in the long hole 15. be able to. The wire 6 is passed through the hole 24 a of the cylindrical portion 24, and the end 19 is locked to the upper surface of the top portion 21 of the end fixing member 20.
Further, as shown in FIG. 4b, the cylindrical portion 24 has an inclined portion 25 in which the outer periphery on the tip end side of the strip 13 is inclined upward.

  Returning to FIGS. 1a and 1b, the float member 7 is a plate-like member, and the shape thereof is preferably a point-symmetric shape such as a circle or a square. The float member 7 is formed with a locking hole 26 for locking the lower end of the wire 6. The wire 6 passes through the locking hole 26 and is locked by the end 19 on the lower surface of the float member 7. The locking holes 26 are preferably arranged at equal intervals around the float member 7.

The wire 6 causes the float member 7 to perform a pendulum motion with its upper end as a fulcrum. Since the four wire rods 6 are provided in parallel, the pendulum motion can be performed in a direction perpendicular to the surface including the two adjacent wire rods 6, and the motion in two directions as a whole is synthesized.
Further, since the spring members 3 and 5 are plate-like, they are easily bent in a direction perpendicular to the plate surface. Because of the directionality of the bending, the vertical component of vibration applied to the float member 7 is relatively easily absorbed. Further, since the tension of the wire 6 is maintained by the weight of the device 29, the pendulum movement of the float member 7 is not hindered.

  The connecting member 8 is a rod-like or cylindrical member extending upward from the float member 7. The connecting member 8 extends upward through the strips 13 of the first spring 3 and the strips 13 of the second spring 5 so as not to interfere with each other (see FIG. 1 a), and the lower surface of the mounting member 9. It is connected to.

  The placement member 9 is a plate-like member having a flat upper surface on which the device 29 is placed. The top surface of the mounting member 9 may be a substantially hemispherical convex surface. As a result, the lower surface of the device 29 and the spherical surface can be brought into point contact and the vibration transmission surface can be reduced, so that the vibration insulation effect is high. When making point contact, as shown in FIG. 2, it is preferable to place the device 29 on the three or more vibration isolators 1 in a balanced manner. In addition, when placing importance on the seismic isolation structure, the contact area between the equipment 29 and the placement member 9 may be increased.

FIG. 5 shows a state in which the device 29 is placed on the vibration isolator 1. When the device 29 is placed on the mounting member 9, the weight of the device 29 is transmitted to the float member 7 through the connecting member 8. The float member 7 pulls the wire 6 downward and displaces the tip of the second spring 5 suspended at the center downward. The force is transmitted from the central portion 12 of the second spring to the column 4. For this reason, the 2nd spring 5 curves upwards as a whole.
The central portion 12 of the first spring 3 is displaced downward together with the support column 4, and the tip of the first spring 3 is locked to the fixing portion 10 of the base 2. For this reason, the 1st spring 3 curves to the convex downward as a whole.
As described above, the first spring 3 and the second spring 5 are bent so as to bend in opposite directions, respectively, so that the respective springs are prevented from interfering due to the bending based on the vibration. Note that FIG. 5 shows a state in which the first spring 3 and the second spring 5 are bent almost to the maximum in order to clearly represent the bent state.
Further, the first spring 3 is supported so that the tip of the first spring 3 can be tilted upward in the recess of the fixing portion 10 when it is curved.

  As shown in FIG. 6, when the device 29 is placed on the placement member 9, the upper surface of the tip portion of the strip 13 of the second spring 5 is inclined downward and contacts the slope inner surface 23 of the end fixing member 20 ( See FIG. 4b). For this reason, the end member 19 can be held horizontally. Moreover, the cylinder part 24 inclines inward in the long hole 15, and the inclination part 25 contacts the inner wall of the front end side of the long hole 15 (refer FIG. 4b). For this reason, the end fixing member 20 is stably fixed in the long hole 15.

The first spring 3 and the second spring 5 are arranged in series with a column 4 interposed therebetween. Here, if the spring constant of the first spring 3 is k1, and the spring constant of the second spring 5 is k2, the combined spring constant K of these springs is K = k1 · k2 / (k1 + k2), and the combined spring constant K Becomes a smaller value than the smaller one of the spring constants k1 and k2. For this reason, the anti-vibration performance can be enhanced. In the present embodiment, the first spring 3 and the second spring 5 are the same. Different spring constants may be used. The spring constants k1 and k2 can be adjusted by increasing or decreasing the number of leaf springs 11. Moreover, the composite spring constant K can be adjusted by increasing / decreasing it.
In the present embodiment, two leaf springs, that is, the first spring 3 and the second spring 5 are used, but three or more springs may be connected in series.

  7a and 7b show another embodiment of the vibration isolator according to the present invention. Since the vibration isolator 27 shown in the figure is substantially the same as the vibration isolator 1 shown in FIGS. 1a and 1b, the same parts are denoted by the same reference numerals and the description thereof is omitted. In the vibration isolator 27, the base end 12 of the first spring 3 is fixed to the lower end of the support column 4, and the base end of the second spring 5 is fixed to the upper end of the support column 4. As shown in FIG. 7b, since the first spring 3 is provided below the second spring 5, when the device is placed on the placement member, the tip of the lower first spring 3 bends upward, Since the tip of the upper second spring 5 bends downward, the first spring 3 and the second spring 5 bend in opposite directions. For this reason, the dimension in the height direction can be further reduced.

DESCRIPTION OF SYMBOLS 1 Vibration isolator 2 Base 2a Cover 3 1st spring 4 Support | pillar 5 2nd spring 6 Wire 7 Float member 8 Connecting member 9 Mounting member 10 Fixing part 11 Leaf spring 12 Central part 13 Strip 14 Central hole 15 Long hole 16 Through Hole 17 Bolt 18 Nut 19 End 20 End fixing member 21 Top portion 22 Side portion 23 Inclined inner surface 24 Tube portion 25 Inclined portion 26 Locking hole 27 Vibration insulating device 28 Floor surface 29 Equipment 30 Support leg k1 Spring constant k2 of the first spring Spring constant K of the second spring Composite spring constant

Claims (5)

An annular base,
A plate-like first spring having a plurality of strips extending radially, the tips of which are locked to the base;
A column fixed to the center of the first spring;
A plate-like second spring having a plurality of strips radially fixed from the central portion of the column and extending radially from the central portion;
A plurality of wire rods whose upper ends are locked to the tips of the respective strip pieces of the second spring, respectively extending downward,
A float member suspended from the lower ends of the wires;
A connecting member connected to the float member and extending upward;
A vibration isolator comprising: a mounting member coupled to the upper end of the coupling member.   The vibration isolator according to claim 1, wherein the first spring and / or the second spring is formed by stacking a plurality of leaf springs. Each strip of the first spring and the second spring has the same number of strips,
The vibration isolator according to claim 1 or 2, wherein the vibration isolator is alternately arranged in a plan view.   The vibration isolator according to any one of claims 1 to 3, wherein a center portion of the first spring is fixed to the support column above a center portion of the second spring.   The vibration isolator according to any one of claims 1 to 3, wherein a center portion of the first spring is fixed to the support column below a center portion of the second spring.

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