JP5379701B2 - Vibration transmission reduction coupling structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce vibration transmission between members by reducing vibrations in translational direction and rotating direction of a coupling portion between the members. <P>SOLUTION: Two dynamic vibration absorbers 31 are disposed so as to sandwich (surround) the coupling portion 21. Therefore, at the coupling portion 21, not only the vibration in the translational direction of an excited member 11 and a transmitted member 14 but also the vibration in the rotating direction about the coupling portion 21 are reduced. Consequently, the vibration transmission between the excited member 11 and the transmitted member 14 can be reduced. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a vibration transmission reduction coupling structure that reduces vibration transmission for the purpose of reducing noise in machines and the like.

  Conventionally, a dynamic vibration absorber has been used as means for reducing vibrations of machines and the like. This dynamic vibration absorber is mainly used to reduce the vibration of a machine such as a gear or a motor that generates an excitation force at a single frequency. Also, it is often used to reduce the transmission of vibration between members. For example, when it is necessary to hold a member rigidly like a structural member, a dynamic vibration absorber may be installed in the coupling part (for example, patent document 1).

  FIG. 15 shows a conventional vibration transmission reduction coupling structure 1001. As shown in FIG. 15A, the vibration of the vibration source 1012 is transmitted to the vibration member 1011 and is transmitted to the member to be transmitted 1014 through the coupling portion 1021. As shown in FIG. 15 (c), there is known one in which a dynamic vibration absorber 1031 is installed in a coupling portion 1021.

JP 2002-357242 A

  However, the conventional vibration transmission reduction coupling structure (1001) only reduces the vibration (Vz) in the translational direction between the vibration-excited member (1011) and the transmitted member (1014), and the rotational direction around the coupling portion. Vibration (Vr) cannot be reduced. Therefore, there is a case where the effect of reducing vibration transmission is not sufficient. As a result, the generation of noise from the transmitted member (1014) may not be sufficiently reduced.

  An object of the present invention is to provide a vibration transmission reduction coupling structure that can reduce transmission of vibration between members by reducing vibrations in a translational direction and a rotation direction at a joint portion between the members.

  A vibration transmission reduction coupling structure according to a first aspect of the present invention is disposed in a first member, a second member disposed to face the first member via a coupling portion, and the first member. A plurality of dynamic vibration absorbers, and the plurality of dynamic vibration absorbers are disposed so as to surround the coupling portion.

  In this vibration transmission reduction coupling structure, a plurality of dynamic vibration absorbers are arranged so as to surround the coupling portion. Therefore, not only the vibration in the translational direction at the coupling part but also the vibration in the rotational direction around the coupling part is reduced. Therefore, transmission of vibration between the first member and the second member can be reduced.

  A vibration transmission reduction coupling structure according to a second invention is the vibration transmission reduction coupling structure according to the first invention, wherein the plurality of motions are viewed from the direction in which the first member and the second member face each other. The center of gravity of the portion surrounded by the vibration absorber substantially coincides with the coupling portion.

In this vibration transmission reduction coupling structure, the coupling portion is surely surrounded by a plurality of dynamic vibration absorbers when viewed from the opposite direction. Therefore, when viewed from the opposite direction, the vibration in the rotational direction around the coupling portion can be more reliably reduced as compared with the case where the center of gravity of the portion surrounded by the plurality of dynamic vibration absorbers does not substantially coincide with the coupling portion.
Here, the center of gravity refers to the center of gravity of the figure. That is, it is the center of gravity when a polygonal portion surrounded by three or more dynamic vibration absorbers is a plate with a constant thickness (or the center of gravity when a straight line connecting two dynamic vibration absorbers is a beam with a constant thickness) is there).

  The vibration transmission reduction coupling structure according to the third invention is the vibration transmission reduction coupling structure according to the first or second invention, wherein the distance between any two of the plurality of dynamic vibration absorbers is: It is 1/32 or more and 3/8 or less of the wavelength of the bending wave generated in the first member.

  In this vibration transmission reduction coupling structure, translational and rotational vibration can be reduced because any two dynamic vibration absorbers are in the in-phase vibration part of the member, and both are not too close to suppress rotational vibration. Can fully exert the moment force. Therefore, vibration in the rotational direction around the coupling portion due to the bending wave generated in the first member can be further reduced.

  A vibration transmission reduction coupling structure according to a fourth invention is the vibration transmission reduction coupling structure according to any one of the first to third inventions, wherein the plurality of dynamic vibration absorbers are formed by cutting the first member. Is formed.

  With this vibration transmission reduction coupling structure, a dynamic vibration absorber can be formed with low cost and high accuracy. Therefore, it is possible to easily form a vibration transmission reduction coupling structure.

  A vibration transmission reduction coupling structure according to a fifth invention is the vibration transmission reduction coupling structure according to any one of the first to fourth inventions, wherein the plurality of dynamic vibration absorbers are the first to third dynamic vibration dampers. The second dynamic vibration absorber includes a pair of peninsula-shaped vibration portions whose longitudinal directions are aligned along a straight line, and is disposed between the first and third dynamic vibration absorbers, The set frequency of the vibration absorber is the same as the third set frequency, and the coupling portion is disposed at the center of the first and third dynamic vibration absorbers and at the center of the second dynamic vibration absorber. Is done.

In this vibration transmission reduction coupling structure, the setting frequency of the first dynamic vibration absorber and the setting frequency of the third dynamic vibration absorber are the same. Therefore, the center (referred to as point A) of the first dynamic vibration absorber and the center (referred to as point C) of the third dynamic vibration absorber are fixed points at the same frequency f0. Therefore, at the frequency f0, the midpoint of the line segment connecting point A and point C (referred to as point B) is a fixed point, and further, the first point passing through point B while being orthogonal to the straight line passing through points A and C. Rotational vibration around the axis on the member (referred to as the X axis) is suppressed.
Further, the second dynamic vibration absorber includes a pair of peninsula-shaped vibrating portions whose longitudinal directions are aligned on a straight line. Accordingly, at the frequency f0, the second dynamic vibration absorber passes around the center (referred to as point B ′) of the second dynamic vibration absorber and around the axis (referred to as Y axis) on the first member orthogonal to the longitudinal direction. Has a natural frequency of rotation. Therefore, the rotational vibration around the Y axis at the point B ′ is suppressed at the frequency f0.
Here, the coupling portion is disposed in the center of the first and third dynamic vibration absorbers and in the center of the second dynamic vibration absorber. That is, the positions of the point B, the point B ′, and the coupling portion are the same. Therefore, the vibration in the translational direction at the coupling part and the vibration in the rotational direction around the coupling part can be reduced.

  Moreover, in this vibration transmission reduction coupling structure, the second dynamic vibration absorber includes a pair of peninsula-shaped vibrating portions whose longitudinal directions are aligned on a straight line. Therefore, the second dynamic vibration absorber can be formed in a space-saving manner.

  A vibration transmission reduction coupling structure according to a sixth aspect of the invention is the vibration transmission reduction coupling structure according to any one of the second to fourth aspects of the invention, comprising three or more dynamic vibration absorbers having the same shape.

  This vibration transmission reduction coupling structure includes three or more dynamic vibration absorbers having the same shape. Therefore, it is sufficient to design one dynamic vibration absorber. Therefore, it is possible to easily design a vibration transmission reducing coupling structure.

  A vibration transmission reduction coupling structure according to a seventh aspect of the present invention is the vibration transmission reduction coupling structure according to any one of the first to sixth aspects, wherein the first member is disposed at a peripheral portion of the plurality of dynamic vibration absorbers. Provide steps or ribs.

  In this vibration transmission reduction coupling structure, the rigidity of the peripheral portion of the plurality of dynamic vibration absorbers is increased. Therefore, the natural frequency of the dynamic vibration absorber can be stabilized (a shift between the vibration frequency of the first member and the set frequency of the dynamic vibration absorber can be suppressed).

  A vibration transmission reduction coupling structure according to an eighth invention is the vibration transmission reduction coupling structure according to the seventh invention, wherein the coupling portion is formed by a step provided in the first member.

  In this vibration transmission reduction coupling structure, not only the peripheral portion of the plurality of dynamic vibration absorbers but also the rigidity of the coupling portion is increased. Therefore, the natural frequency of the dynamic vibration absorber can be further stabilized.

  A vibration transmission reduction coupling structure according to a ninth invention is the vibration transmission reduction coupling structure according to the seventh or eighth invention, wherein the first member is plate-shaped, and the step is a press of the first member. It is formed by processing.

  In this vibration transmission reduction coupling structure, a step is formed by pressing the first member. Therefore, compared with the case where the members are connected and formed by welding or the like, the vibration transmission reducing coupling structure can be manufactured with low cost and accuracy, and the natural frequency of the dynamic vibration absorber can be further stabilized.

  As described in the above description, in the present invention, a plurality of dynamic vibration absorbers are disposed so as to surround the coupling portion, so that vibrations in the translational direction and the rotation direction at the coupling portion are reduced, thereby reducing the vibration between the members. The transmission of vibration can be reduced.

It is a side view of a vibration transmission reduction coupling structure. It is a graph which shows the relationship between the distance between dynamic vibration absorbers, and a vibration. It is a top view of the vibration transmission reduction coupling structure of a 2nd embodiment. It is a figure equivalent to FIG. 3 of 3rd Embodiment. It is a top view of the vibration transmission reduction coupling structure of a 4th embodiment. It is a figure equivalent to FIG. 3 of 5th Embodiment. It is a figure equivalent to FIG. 6 of 6th Embodiment. It is a perspective view which shows the vibration transmission coupling structure of 7th Embodiment. It is the perspective view which expanded the coupling | bond part periphery shown in FIG. FIG. 10 is a plan view showing the vicinity of the coupling portion shown in FIG. 9. It is a side view which shows operation | movement of the dynamic vibration damper shown in FIG. It is a top view which shows the vibration transmission coupling structure of 8th Embodiment. It is a figure equivalent to FIG. 12 of 9th Embodiment. It is a figure equivalent to FIG. 12 of 10th Embodiment. It is a side view of the conventional vibration transmission reduction coupling structure.

  Hereinafter, embodiments of a vibration transmission reduction coupling structure according to the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a diagram showing an overall configuration of a vibration transmission reduction coupling structure. FIG. 2 is a graph showing the relationship between the distance between the dynamic vibration absorbers shown in FIG. 1 and the vibration when no dynamic vibration absorber is used. The configuration of the vibration transmission reduction coupling structure 1 will be described in detail with reference to FIGS.

  The vibration transmission reduction coupling structure 1 reduces the transmission of vibration for the purpose of reducing the noise of machines and the like. In this vibration transmission reduction coupling structure 1, the traveling direction of the bending wave is one-dimensional (one direction), and at least two dynamic vibration absorbers are provided along this direction. Hereinafter, the excited member 11, the excitation source 12, the coupling part 21, the transmitted member 14, the dynamic vibration absorber 31R, and the dynamic vibration absorber 31L constituting the vibration transmission reduction coupling structure 1 will be described.

The vibrating member 11 (first member) is a member that is vibrated by the vibration source 12.
A bending wave is generated in the vibrating member 11 by being vibrated by the vibration source 12. The wavelength of the bending wave can be calculated or measured with a vibrometer. And the length of the longitudinal direction of this vibrating member 11 is longer than the half wavelength of a bending wave. The length in the thickness direction and the short direction is shorter than the half wavelength of the bending wave. With this shape, the traveling direction of the bending wave of the vibrating member 11 is a beam element in one direction in the longitudinal direction (the traveling of the bending wave is one-dimensional).

  The excitation source 12 generates an excitation force at a single frequency, such as a gear or a motor. The excitation source 12 is installed at an arbitrary point of the excitation member 11.

  The coupling portion 21 is a portion that couples the vibrating member 11 and the transmitted member 14. More specifically, the coupling portion 21 is a portion where the vibrating member 11 and the transmitted member 14 are coupled by bolts, welding, or the like.

  The transmitted member 14 (second member) is a member to which vibration is transmitted from the excited member 11 via the coupling portion 21, and is disposed to face the excited member 11.

The dynamic vibration absorber 31R and the dynamic vibration absorber 31L (these two dynamic vibration absorbers are referred to as the dynamic vibration absorber 31) are provided to reduce the vibration of the transmitted member 14. The vibration to be reduced is a vibration in a direction (translation direction) in which the vibrating member 11 and the transmitted member 14 face each other. The dynamic vibration absorber 31R and the dynamic vibration absorber 31L have the same natural frequency.
The two dynamic vibration absorbers 31 are provided on the vibration-excited member 11. It arrange | positions on the surface (lower surface in FIG. 1) of the thickness direction of the to-be-excited member 11 in which the excitation source 12 is not provided. Details of the positions of the dynamic vibration absorber 31R and the dynamic vibration absorber 31L will be described later.

  The dynamic vibration absorber 31R includes a spring 41R and a weight 42R. One end of the spring 41 </ b> R is attached to the vibrating member 11. The weight 42R is attached to the free end of the spring 41R.

  The dynamic vibration absorber 31L includes a spring 41L and a weight 42L. One end of the spring 41 </ b> L is attached to the vibrating member 11. The spring 41L has the same spring constant as the spring 41R of the dynamic vibration absorber 31R. The weight 42L is attached to the free end of the spring 41L. The weight 42L has the same mass as the weight 42R of the dynamic vibration absorber 31R.

(Arrangement of dynamic vibration absorber)
The dynamic vibration absorber 31R and the dynamic vibration absorber 31L are arranged so as to sandwich (enclose) the coupling portion 21 therebetween. This is to reduce vibration in the rotational direction around the coupling portion 21 of the vibration-excited member 11 and the transmitted member 14.

  In order to reliably reduce vibration in the rotational direction around the coupling portion 21, the center 31c (center of gravity) of the portion 31a sandwiched (enclosed) between the dynamic vibration absorber 31R and the dynamic vibration absorber 31L and the coupling portion 21 are Provide approximately the same. The portion 31a is a straight line.

(Distance between dynamic vibration absorbers)
A distance between the dynamic vibration absorber 31R and the dynamic vibration absorber 31L is a distance D1. The distance D1 is set to be 1/32 or more and 3/8 or less of the wavelength of the bending wave of the vibrating member 11. This is to further reduce the vibration, as will be described later.

  The graph shown in FIG. 2 shows the relationship between the distance between the dynamic vibration absorbers with respect to the wavelength of the bending wave and the vibration in the case of no dynamic vibration absorber. This graph is a graph in the case where the coupling portion 21 shown in FIG. 1 is sandwiched between two dynamic vibration absorbers 31, and the center 31 c between the two dynamic vibration absorbers 31 and the coupling portion 21 coincide with each other. Moreover, the natural frequency of each of the at least two dynamic vibration absorbers 31 needs to match.

  The horizontal axis of the graph (see FIG. 2) indicates the distance D1 with respect to the wavelength of the bending wave.

  The vertical axis of the graph (see FIG. 2) shows the vibration in the coupling portion 21 when there is a dynamic vibration absorber when there is no dynamic vibration absorber. The vibration in the coupling part 21 includes a vibration in the translation direction and a vibration in the rotation direction.

  The vibration in the translation direction is a vibration in a direction (vertical direction in FIG. 1) in which the vibrating member 11 and the transmitted member 14 translate in the thickness direction. This vibration is indicated by a broken line in the graph shown in FIG.

  The vibration in the rotation direction is a vibration in the rotation direction around the coupling portion 21 shown in FIG. In addition, the vibration is on a plane including the coupling portion 21 and the two dynamic vibration absorbers 31. This vibration is indicated by a solid line in FIG.

  As shown in FIG. 2, the relationship between the distance D1 and the vibration in the rotational direction is as follows. When the distance D1 is 1/32 or more and 3/8 or less of the wavelength of the bending wave, vibrations in the translational direction and the rotational direction are reduced as compared with other distances.

  Further, when the distance D1 is large to small (from right to left in FIG. 2), the following relationship is obtained. When the distance D1 is about 3/8 or less of the wavelength of the bending wave, vibrations in the translational direction and the rotational direction are reduced. At 5/21 wavelength, the vibration in the rotational direction was minimized and the vibration in the translational direction was also reduced. From around 1/16 of the wavelength, the vibration in the rotational direction increased slightly. When the wavelength was 1/32 or less, vibration in the rotational direction further increased.

[Features of the vibration transmission reduction coupling structure of this embodiment]
The vibration transmission reduction coupling structure of this embodiment has the following characteristics.

In the vibration transmission reduction coupling structure 1 of the present embodiment, as shown in FIG. 1, two dynamic vibration absorbers 31 are arranged so as to sandwich (enclose) the coupling portion 21. Therefore, in the coupling portion 21, not only the vibration in the translational direction between the excited member 11 and the transmitted member 14, but also the vibration in the rotational direction around the coupling portion 21 is reduced. Therefore, the transmission of vibration between the vibrating member 11 and the transmitted member 14 can be reduced.
That is, in the vibration-excited member 11, the traveling direction of the bending wave is one direction. In this case, the vibration in the rotational direction around the coupling portion 21 can be reduced by two (or two or more) dynamic vibration absorbers 31.

If these are arranged so that the coupling portion 21 and the dynamic vibration absorber coincide with each other, vibration in the rotational direction around the coupling portion 21 cannot be reduced.
On the other hand, in this vibration transmission reduction coupling structure 1, the center 31 c (center of gravity) of the two dynamic vibration absorbers 31 and the coupling portion 21 are substantially viewed from the direction in which the excited member 11 and the transmitted member 14 face each other. Match. Therefore, when viewed from the same direction, the coupling portion 21 is disposed so as to be reliably sandwiched (enclosed) by the two dynamic vibration absorbers. Therefore, vibration in the rotational direction around the coupling portion 21 can be more reliably reduced.

  As shown in FIG. 2, when the distance D1 between the two dynamic vibration absorbers 31 is set to 1/32 or more and 3/8 or less of the wavelength of the bending wave generated in the vibrating member 11, in the case of other distances In comparison, the vibration at the coupling portion 21 was reduced. In the vibration transmission reduction coupling structure 1 shown in FIG. 1, the distance D1 between the two dynamic vibration absorbers 31 is within the range of this distance. Therefore, vibrations in the rotational direction around the coupling portion 21 due to bending waves generated in the vibrating member 11 can be further reduced.

(Second Embodiment)

  FIG. 3 is a view of the vibration transmission reduction coupling structure according to the second embodiment of the present invention as seen from the side of the vibrating member in the direction in which the vibrating member and the transmitted member face each other. In the second embodiment, unlike the first embodiment in which the traveling direction of the bending wave transmitted through the vibrating member is one-dimensional, the traveling direction of the bending wave is two-dimensional. Unlike the first embodiment in which the number of dynamic vibration absorbers is two, the number of dynamic vibration absorbers is three. Since other configurations are the same as those of the first embodiment, the same reference numerals are given and description thereof is omitted.

  The vibrating member 211 is a plate. The length of the side in the short direction (vertical direction in FIG. 3) is longer than the half wavelength of the bending wave generated in the vibrating member 211. The length in the longitudinal direction (left-right direction in FIG. 3) and the thickness direction (front-rear direction in FIG. 3) are the same as those of the vibrating member 11 according to the first embodiment. That is, the length in the longitudinal direction is longer than the half wavelength of the bending wave. The length in the thickness direction is shorter than the half wavelength of the bending wave. With this shape, the traveling direction of the bending wave of the vibrating member 211 is a direction on a plane including the longitudinal direction and the short direction (the traveling of the bending wave is two-dimensional).

  The coupling portion 21 is disposed at the approximate center of the vibrating member 211 in the short direction.

(Arrangement of dynamic vibration absorber)
The dynamic vibration absorber 32U, the dynamic vibration absorber 32BL, and the dynamic vibration absorber 32BR (these three dynamic vibration absorbers are referred to as the dynamic vibration absorber 32) are disposed so as to surround the coupling portion 21. That is, they are arranged as follows. A portion surrounded by a straight line (dotted line in FIG. 3) connecting these three dynamic vibration absorbers 32 is a portion 32a when viewed from the direction in which the vibration-excited member 211 and the transmitted member 14 face each other. This portion 32a forms an equilateral triangle. The coupling portion 21 is located inside the portion 32a. This is to reduce vibration in the rotational direction around the coupling portion 21.

  Further, the center of gravity 32c of the portion 32a and the coupling portion 21 substantially coincide with each other when viewed from the direction (the vertical direction in FIG. 3) in which the vibrating member 211 and the transmitted member 14 face each other. This is for reliably reducing vibration in the rotational direction around the coupling portion 21. The center of gravity of the portion 32a is the center of mass when the mass is uniformly distributed on the graphic of the portion 32a. Further, since the thickness of the vibrating member 211 is uniform, the center of gravity of the portion 32a coincides with the center of gravity of the vibrating member 211 in the portion 32a when viewed from the same direction.

  The dynamic vibration absorber 32U, the dynamic vibration absorber 32BL, and the dynamic vibration absorber 32BR have the same shape. Further, the distance between the three dynamic vibration absorbers 32 (the length of the three sides of the triangular portion 32a) is (or at least one) not less than 1/32 and not more than 3/8 of the wavelength of the bending wave. .

[Features of the vibration transmission reduction coupling structure of this embodiment]
The vibration transmission reduction coupling structure of this embodiment has the following characteristics.

In the vibration transmission reduction coupling structure 1 of the present embodiment, the dynamic vibration absorber 32 is disposed so as to surround the coupling portion 21. Therefore, in the coupling portion 21, not only the translational direction of the vibration-excited member 211 and the transmitted member 14, but also the vibration in the rotational direction around the coupling portion 21 is reduced. Therefore, vibration transmission between the vibration-excited member 211 and the transmitted member 14 can be reduced.
That is, the progression of the bending wave transmitted through the vibration-excited member 211 is two-dimensional. In this case, three (or three or more) dynamic vibration absorbers 32 are used to generate vibration in the rotational direction around the coupling portion 21. Can be reduced.

If the coupling portion 21 is disposed on the boundary portion of the portion 32a surrounded by the dynamic vibration absorber 32, that is, on a straight line connecting the two dynamic vibration absorbers, vibration in the rotation direction with the straight line direction as the rotation axis cannot be reduced.
However, in the vibration transmission reduction coupling structure 1 of the present embodiment, the center of gravity 32c of the portion 32a surrounded by the dynamic vibration absorber 32 and the coupling portion are seen from the direction in which the excited member 211 and the transmitted member 14 face each other. 21 substantially matches. Therefore, the coupling portion 21 is reliably disposed in the portion 32a. Therefore, vibration in the rotational direction around the coupling portion 21 can be more reliably reduced.

  In the vibration transmission reduction coupling structure 1 of the present embodiment, the dynamic vibration absorber 32U, the dynamic vibration absorber 32BL, and the dynamic vibration absorber 32BR have the same shape. Therefore, only one dynamic vibration absorber needs to be designed. Therefore, the vibration transmission reducing coupling structure 1 can be easily designed.

(Third embodiment)
FIG. 4 is a diagram illustrating the vibration transmission reduction coupling structure 1 according to the third embodiment, and corresponds to FIG. 3 according to the second embodiment. In the third embodiment, unlike the second embodiment in which three dynamic vibration absorbers are provided, four dynamic vibration absorbers are provided. Since other configurations are the same as those of the second embodiment, the same reference numerals are given and description thereof is omitted.

(Arrangement of dynamic vibration absorber)
The dynamic vibration absorber 33UR, the dynamic vibration absorber 33UL, the dynamic vibration absorber 33BL, and the dynamic vibration absorber 33BR (these four dynamic vibration absorbers are referred to as the dynamic vibration absorber 33) are arranged so as to surround the coupling portion 21. That is, it arrange | positions as follows. A portion surrounded by a straight line (dotted line in FIG. 4) that connects the dynamic vibration absorbers 33 when viewed from the direction in which the vibration-excited member 211 and the transmitted member 14 face each other is defined as a portion 33a. This portion 33a forms a square. The coupling portion 21 is located inside the portion 33a. The distance between the four dynamic vibration absorbers 33 (the length of the four sides of the square portion 33a and the length of the diagonal line of the portion 33a) is (or at least one) at least 1/32 of the wavelength of the bending wave. 3/8 or less.

  Further, these dynamic vibration absorbers are arranged so that the center of gravity 33c of the portion 33a and the coupling portion 21 substantially coincide with each other when viewed from the direction in which the vibration-excited member 211 and the transmitted member 14 face each other.

[Features of the vibration transmission reduction coupling structure of this embodiment]
The vibrating member 211 has a two-dimensional bending wave. In this case, transmission of vibration in the rotational direction around the coupling portion 21 can be reduced by using the four dynamic vibration absorbers 32.

(Fourth embodiment)
FIG. 5 is a diagram illustrating the vibration transmission reduction coupling structure 1 according to the fourth embodiment, and corresponds to FIG. 4 according to the third embodiment. In the fourth embodiment, the shape of the vibrating member is different from that of the third embodiment. The configuration of the dynamic vibration absorber is different from that of the third embodiment. Since other configurations are the same as those of the third embodiment, the same reference numerals are given and description thereof is omitted.

  In the vibrating member 411, the traveling direction of the bending wave is one direction (one-dimensional). The vibrating member 411 is a beam. The longitudinal direction (left-right direction in FIG. 5) is longer than the half wavelength of the bending wave. The short direction (vertical direction in FIG. 5) and the thickness direction (front-rear direction in FIG. 5) are the same as those of the vibration member 211 according to the third embodiment. That is, the short direction and the thickness direction are shorter than the half wavelength of the bending wave.

(Arrangement of dynamic vibration absorber)
The dynamic vibration absorber 34UL, the dynamic vibration absorber 34BL, the dynamic vibration absorber 34BR, and the dynamic vibration absorber 34UR (these four dynamic vibration absorbers are referred to as the dynamic vibration absorber 34) are provided in a square shape. That is, it is provided as follows. One dynamic vibration absorber 34UL is provided at a position shifted from the coupling portion 21 (position shifted to the upper left in FIG. 5). The dynamic vibration absorber 34BL is provided at a position which is symmetrical with the dynamic vibration absorber 34UL with respect to a straight line passing through the coupling portion 21 in the longitudinal direction of the vibration-excited member 411. The dynamic vibration absorber 34UR and the dynamic vibration absorber 34BR are provided at positions that are line-symmetric with the dynamic vibration absorber 34UL and the dynamic vibration absorber 34BL with respect to a straight line passing through the coupling portion 21 in the short direction of the excited member 411.

The dynamic vibration absorber 34UL is formed by a cut portion 51 obtained by cutting the vibration-excited member 411.
The cut portion 51 has a peninsular shape (a U-shape). That is, a cut 51a is formed from the vicinity of the center in the short direction toward the outer side in the short direction (upward in FIG. 5), and a cut 51b is formed in the longitudinal direction (left side in FIG. 5) therefrom. A cut 51c is formed on the lower side in FIG. The cut portion 51 forms a dynamic vibration absorber 34UL having a spring and weight portion.

[Features of the vibration transmission reduction coupling structure of this embodiment]
In the vibration transmission reduction coupling structure 1 of the present embodiment, the dynamic vibration absorber 34 is formed by cutting the excited member 411. Therefore, the dynamic vibration absorber 34 can be formed with low cost and high accuracy. Therefore, the vibration transmission reduction coupling structure 1 can be easily formed.

(Fifth embodiment)
FIG. 6 is a diagram illustrating a vibration transmission reduction coupling structure according to the fifth embodiment, and corresponds to FIG. 3 according to the second embodiment. In the fifth embodiment, the configuration of the dynamic vibration absorber is different from that of the second embodiment. Since other configurations are the same as those of the second embodiment, the same reference numerals are given and description thereof is omitted.

  The dynamic vibration absorber 35U, the dynamic vibration absorber 35BL, and the dynamic vibration absorber 35BR (these three dynamic vibration absorbers are referred to as the dynamic vibration absorber 35) are the dynamic vibration absorber 32U and the dynamic vibration absorber 32BL of the second embodiment shown in FIG. , And the dynamic vibration absorber 32BR (therefore, description of vibration reduction is omitted).

The dynamic vibration absorber 35U includes a dynamic vibration absorber 35Uu and a dynamic vibration absorber 35Ub. That is, the dynamic vibration absorber 35U is a combination of the dynamic vibration absorber 35Uu and the dynamic vibration absorber 35Ub and is regarded as one dynamic vibration absorber.
These two dynamic vibration absorbers are arranged as follows. The dynamic vibration absorber 35Uu is provided on a straight line connecting the coupling portion 21 and the support portion 61s. The dynamic vibration absorber 35Ub is provided at a position obtained by rotating the dynamic vibration absorber 35Uu by 180 degrees around the support portion 61s.

  The dynamic vibration absorber 35Uu is formed by a cut portion 61 in which the excited member 211 is cut. The cut portion 61 is formed in a triangle by the cut 61a, the cut 61b, and the cut 61c. The cut portion 61 forms a dynamic vibration absorber 35Uu that is a spring and weight portion. The dynamic vibration absorber 35Ub, the dynamic vibration absorber 35BL, and the dynamic vibration absorber 35BR are similarly formed.

(Sixth embodiment)
FIG. 7 is a diagram illustrating a vibration transmission reduction coupling structure according to the sixth embodiment, and corresponds to FIG. 6 according to the fifth embodiment. In the sixth embodiment, the shape of the dynamic vibration absorber is different from that of the fifth embodiment. In addition, about another structure, it is the same as that of 5th Embodiment, attaches | subjects the same code | symbol and abbreviate | omits the description.

  The dynamic vibration absorber 36U, the dynamic vibration absorber 36BL, and the dynamic vibration absorber 36BR are provided as follows. That is, the dynamic vibration absorber 35U, the dynamic vibration absorber 35BL, and the dynamic vibration absorber 35BR according to the fifth embodiment shown in FIG. 6 are provided in a shape rotated 90 degrees to the left about the respective support portions 61s.

(Seventh embodiment)
FIG. 8 is a perspective view showing a vibration member (first member) of the vibration transmission reduction coupling structure of the seventh embodiment. FIG. 9 is an enlarged perspective view of the periphery of the coupling portion shown in FIG. 10 is a plan view of the dynamic vibration absorber shown in FIG. FIG. 11 is a side view showing the operation of the dynamic vibration absorber. The main difference between the second, third, fifth and sixth embodiments described above and the seventh embodiment described below is the shape of the dynamic vibration absorber. In addition, the same code | symbol is attached | subjected to the part similar to embodiment mentioned above, and the description is abbreviate | omitted.

  As shown in FIG. 8, the transmitted member 714 (second member) is a quadrangular plate (panel), for example, a resin (indicated by a two-dot chain line). The vibrating member 711 (first member) is a quadrangular frame obtained by bending a plate (for example, a steel plate). And the coupling | bond part 721 is arrange | positioned 1 each in the four corners of the to-be-vibrated member 711. FIG. In addition, the formation method of this coupling | bond part 721 is demonstrated in 8th Embodiment mentioned later, and description is abbreviate | omitted here. Moreover, in FIG. 8, description of the dynamic vibration absorber mentioned later is abbreviate | omitted.

  As shown in FIG. 9, the dynamic vibration absorber 37 is arranged so as to surround one coupling portion 721. The dynamic vibration absorber 37 includes three dynamic vibration absorbers 37A, 37B, and 37C (first, second, and third dynamic vibration absorbers) each including a pair of (two) peninsula-shaped dynamic vibration absorbers. ).

  The dynamic vibration absorbers 37A, 37B, and 37C are arranged and formed under the following conditions. As shown in FIG. 10, the dynamic vibration absorber 37B is disposed between the dynamic vibration absorber 37A and the dynamic vibration absorber 37C. The set frequency of the dynamic vibration absorber 37A (the frequency at which vibration can be absorbed most) and the set frequency of the dynamic vibration absorber 37C are the same. A coupling portion 721 is disposed in the center of the dynamic vibration absorbers 37A and 37C. A coupling portion 721 is disposed in the center of the dynamic vibration absorber 37B. The dynamic vibration absorbers 37A, 37B, and 37C are arranged such that their longitudinal directions (X direction) are arranged in parallel (in the Y direction). Next, these dynamic vibration absorbers will be further described.

  The dynamic vibration absorber 37A (first dynamic vibration absorber) includes a pair of (two) peninsula-shaped vibration portions 37Ar and 37Al. More specifically, the vibrating portion 37Ar is disposed on one side (X1 side) with the support portion 71s as the center, and the vibrating portion 37Al is disposed on the other side (X2 side). Each is formed by a “U” -shaped cutout 71. The center of this dynamic vibration absorber 37A (which overlaps with the support portion 71s) is defined as a point A.

  The dynamic vibration absorber 37C (third dynamic vibration absorber) has the same set frequency as the dynamic vibration absorber 37A as described above. This set frequency is made to coincide with the vibration frequency of the vibrating member 711. The dynamic vibration absorber 37C has the same shape as that of the dynamic vibration absorber 37A, and includes a pair of (two) peninsula-shaped vibration portions 37Cr and 37Cl with the support portion 71s as the center. The center of the dynamic vibration absorber 37C is a point C. A midpoint of a line segment connecting the points A and C is a point B. The direction of the straight line connecting point A and point C is along the direction (Y direction) orthogonal to the longitudinal direction of dynamic vibration absorber 37C (37A, 37B).

  As described above, the dynamic vibration absorber 37B (second dynamic vibration absorber) is disposed between the dynamic vibration absorbers 37A and 37C. More specifically, it is disposed between and adjacent to the dynamic vibration absorbers 37A and 37C. The dynamic vibration absorber 37B includes a pair of peninsula-shaped vibrating portions 37Br and 37B1 whose longitudinal directions are aligned on a straight line (which is a balance type). The dynamic vibration absorber 37B has a shape different from that of the dynamic vibration absorbers 37A and 37C, and the length in the longitudinal direction (X direction) is shorter than that of the dynamic vibration absorbers 37A and 37C. The center of the dynamic vibration absorber 37B is a point B '.

In the dynamic vibration absorbers 37A, 37B, and 37C, vibrations in the translation direction and the rotation direction are suppressed as follows.
As shown in FIG. 11A, when both ends (both ends in the X direction) vibrate in the same phase, a damping force Ez in the translational direction is generated in the central portion (the center in the X direction, that is, the points A and C). The dynamic vibration absorbers 37 </ b> A and 37 </ b> C are set so that the vibration damping force Ez is the largest with respect to the vibration in the translational direction at the coupling portion 721.
As shown in FIG. 11B, when both ends vibrate in opposite phases, a vibration damping force Er in the rotational direction is generated at the center. The dynamic vibration absorber 37 </ b> B is set so that the vibration damping force Er is the largest with respect to vibration in the rotational direction at the coupling portion 721.

[Features of the vibration transmission reduction coupling structure of this embodiment]
In the vibration transmission reduction coupling structure 1 of the present embodiment, as shown in FIG. 10, the setting frequency of the dynamic vibration absorber 37A (first dynamic vibration absorber) and the setting of the dynamic vibration absorber 37C (third dynamic vibration absorber) are set. The frequency is the same. Therefore, the center (point A) of the dynamic vibration absorber 37A and the center (point C) of the dynamic vibration absorber 37C are fixed points at the same frequency f0. Therefore, at the frequency f0, the midpoint (point B) of the line segment connecting the point A and the point C is a fixed point. Furthermore, rotational vibration about the axis (X axis) on the vibrating member 711 passing through the point B and orthogonal to the straight line passing through the points A and C is suppressed.
The dynamic vibration absorber 37B (second dynamic vibration absorber) includes a pair of peninsula-shaped vibration parts (vibration part 37r and vibration part 37l) whose longitudinal directions are aligned on a straight line. Therefore, at the frequency f0, the dynamic vibration absorber 37B has a natural frequency of rotation around the axis (Y axis) on the vibration-excited member 711 passing through the center (point B ′) and orthogonal to the longitudinal direction (X direction). Have. Therefore, the rotational vibration around the Y axis at the point B ′ is suppressed at the frequency f0 (see FIG. 11B). That is, rotational vibration about the X axis and the Y axis is suppressed.
Here, in this vibration transmission reduction coupling structure 1, the coupling portion 721 is disposed at the center (point B) of the dynamic vibration absorber 37A and the dynamic vibration absorber 37C and at the center (point B ') of the dynamic vibration absorber 37B. The That is, the positions of the point B, the point B ′, and the coupling portion 721 are the same. Therefore, vibration in the translation direction (Z direction shown in FIG. 9) in the coupling portion 721 and vibration in the rotation direction around the coupling portion 721 can be reduced.

  In this vibration transmission reduction coupling structure 1, the dynamic vibration absorber 37 </ b> B includes a pair of peninsula-shaped vibrating portions 37 </ b> Bl and 37 </ b> Br whose longitudinal directions are aligned on a straight line. Therefore, the second dynamic vibration absorber can be formed in a space-saving manner.

(Eighth embodiment)
FIG. 12 is a plan view showing the vibration transmission reduction coupling structure of the eighth embodiment. The main differences from the sixth embodiment shown in FIG. 7 are the shape of the dynamic vibration absorber and the level difference of the excited member. In addition, about another structure, it is the same as that of 6th Embodiment, attaches | subjects the same code | symbol and abbreviate | omits the description.

  The dynamic vibration absorbers 38U, 38BL, and 38BR constituting the dynamic vibration absorber 38 shown in FIG. 12 correspond to the dynamic vibration absorbers 36U, 36BL, and 36BR of the sixth embodiment shown in FIG. Further, in the dynamic vibration absorbers 36U, 36BL, and 36BR of the sixth embodiment, two triangular cutouts are changed to two T-shaped cutouts, respectively, as shown in FIG. , 38BL, and 38BR.

  The vibrating member 811 has a plate shape like the vibrating member 211 of the sixth embodiment shown in FIG. Further, as shown in FIG. 12, the vibration-excited member 811 includes a step 811a at the periphery of the dynamic vibration absorbers 38U, 38BL, and 38BR.

  The step 811a is provided to stabilize the natural frequencies of the dynamic vibration absorbers 38U, 38BL, and 38BR. The dynamic vibration absorbers 38U, 38BL, and 38BR are provided around the periphery thereof. The same effect can be obtained even when the step 811a is a rib (plate member). The step 811a is formed by pressing a plate-like excited member 811.

  The coupling portion 721 is formed by a step provided on the vibration-excited member 811. Similar to the step 811 a, this is formed by pressing the vibrating member 811.

[Features of the vibration transmission reduction coupling structure of this embodiment]
In the vibration transmission reduction coupling structure 1 of the present embodiment, a step 811a (or a rib) is provided in the periphery of the dynamic vibration absorbers 38U, 38BL, and 38BR. Therefore, the rigidity of the peripheral portion of the dynamic vibration absorbers 38U, 38BL, and 38BR is increased. Accordingly, the natural frequency of the dynamic vibration absorbers 38U, 38BL, and 38BR can be stabilized (the difference between the set frequency of the dynamic vibration absorbers 38U, 38BL, and 38BR and the vibration frequency of the vibration-excited member 811). Can be suppressed).

  Further, in the vibration transmission reduction coupling structure 1 of the present embodiment, the coupling portion 721 is formed by a step provided on the vibrating member 811. Therefore, not only the periphery of the dynamic vibration absorbers 38U, 38BL, and 38BR but also the rigidity of the coupling portion 721 is increased. Therefore, the natural frequencies of the dynamic vibration absorbers 38U, 38BL, and 38BR can be further stabilized.

Further, in the vibration transmission reduction coupling structure 1 of the present embodiment, the step 811 a (and the coupling portion 721 that is a step) is formed by press working of the vibrating member 811. Therefore, compared with the case where these are formed by connecting members by welding or the like, the vibration transmission reduction coupling structure 1 can be manufactured with low cost and accuracy, and the natural frequencies of the dynamic vibration absorbers 38U, 38BL, and 38BR are more stable. Can be made.

(Ninth embodiment)
FIG. 13 is a plan view showing the vibration transmission reducing coupling structure of the ninth embodiment. A difference from the seventh embodiment shown in FIGS. 8 to 10 is a step of the vibrating member. Since other configurations are the same as those of the seventh embodiment, the same reference numerals are given and description thereof is omitted.

  As shown in FIG. 13, the vibration-excited member 811 includes a step 911a in the periphery of the dynamic vibration absorbers 37A, 37B, and 37C. The step 911a is formed in a rectangular shape so as to surround the dynamic vibration absorbers 37A, 37B, and 37C. Further, the step 911a is formed by pressing the vibrating member 911 similarly to the step 811a shown in FIG.

(10th Embodiment)
FIG. 14 is a plan view showing the vibration transmission reduction coupling structure of the tenth embodiment, and is a view corresponding to FIG. The difference from the ninth embodiment shown in FIG. 13 is the shape of the coupling portion. Since other configurations are the same as those of the ninth embodiment, the same reference numerals are given and description thereof is omitted.

  As shown in FIG. 14, the coupling portion 921 is a rectangle having a longitudinal direction in the direction (Y direction) in which the dynamic vibration absorbers 37A, 37B, and 37C are arranged. More specifically, the length of the coupling portion 921 in the Y direction is larger than the length of the dynamic vibration absorber 37 in the Y direction. That is, the Y1 side end of the coupling portion 921 is on the Y1 side from the Y1 side end portion of the dynamic vibration absorber 37A, and the Y2 side end portion of the coupling portion 921 is on the Y2 side from the Y2 side end portion of the dynamic vibration absorber 37C. .

  As mentioned above, although embodiment of this invention was described based on drawing, a specific structure is not restricted to these embodiment, It can change in the range which does not deviate from the summary of invention.

For example, the member to be transmitted may be a beam (a bending wave travel is one-dimensional) or a plate (a bending wave travel is two-dimensional).
Moreover, you may provide a dynamic vibration absorber in a to-be-transmitted member. When a dynamic vibration absorber is provided on a member to be transmitted and the traveling direction of the bending wave transmitted through the member to be transmitted is one direction (one dimension), the dynamic vibration absorber is disposed so as to sandwich (enclose) one coupling portion. Two are provided. When the traveling direction of the bending wave transmitted through the member to be transmitted is two directions (two dimensions), three or more dynamic vibration absorbers are provided so as to surround one coupling portion. Thereby, the vibration of the rotation direction around a coupling part can further be reduced compared with the case where a dynamic vibration absorber is provided only in a to-be-excited member.

1 Vibration transmission reduction coupling structure 11, 211, 411, 711, 811, 911 Excited member (first member)
14, 714 Transmitted member (second member)
21, 721, 921 Coupling part 31, 32, 33, 34, 35, 36, 37, 38 Dynamic vibration absorber 31 a Part sandwiched (enclosed part)
32a, 33a part (enclosed part)
31c Center (center of gravity)
32c, 33c Center of gravity 37Bl, 37Br Vibration part D1 Distance

Claims (7)

A first member;
A second member disposed facing the first member via a coupling portion;
A plurality of dynamic vibration absorbers disposed on the first member;
Have
The plurality of dynamic vibration absorbers are arranged so as to surround the coupling portion,
As seen from the direction in which the first member and the second member face each other, the center of gravity of the portion surrounded by the plurality of dynamic vibration absorbers substantially coincides with the coupling portion,
Wherein among the plurality of the dynamic vibration reducer, the distance between any two of the dynamic vibration reducer, the first member to produce bending wave 1/32 or more wavelengths of state, and are 3/8 or less,
Vibrations reducing vibrations of the bending wave in the translational direction between the first member and the second member related to the coupling part and vibrations of the bending wave in the rotational direction around the coupling part Transmission reduction coupling structure. The vibration transmission reduction coupling structure according to claim 1 , wherein the plurality of dynamic vibration absorbers are formed by cutting the first member. The plurality of dynamic vibration absorbers include first to third dynamic vibration absorbers,
The second dynamic vibration absorber includes a pair of peninsula-shaped vibration portions whose longitudinal directions are aligned along a straight line, and is disposed between the first and third dynamic vibration absorbers,
The set frequency of the first dynamic vibration absorber and the set frequency of the third dynamic vibration absorber are the same,
3. The vibration transmission reduction coupling structure according to claim 1, wherein the coupling portion is disposed in the center of the first and third dynamic vibration absorbers and in the center of the second dynamic vibration absorber. The vibration transmission reducing coupling structure according to any one of claims 1 to 3 , wherein the plurality of dynamic vibration absorbers include three or more dynamic vibration absorbers having the same shape. It said first member comprises a step or rib on the periphery of the plurality of dynamic vibration absorber, the vibration transmission reduction coupling structure according to any one of claims 1-4. The vibration transmission reduction coupling structure according to claim 5 , wherein the coupling portion is formed by a step provided on the first member. The first member is plate-shaped,
The vibration transmission reduction coupling structure according to claim 5 or 6 , wherein the step is formed by pressing the first member.

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