JP2009092099A - Vibration noise reducing structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibration noise reducing structure capable of obtaining a sufficient vibration restricting effect by using a member capable of converting kinetic energy to heat energy. <P>SOLUTION: This vibration noise reducing structure structured by fixing a damping member 3 to a damped surface 2 of a damped object 1 so as to form a free end is characterized by fixing a protrusion part 6, which is fitted to a bar-like member 4 having rigidity larger than that of the damping member 3 and which has an inner peripheral hole 7 larger than the outer periphery of the damping member 3, and the bar-like member 4, which is formed with a free end in one end thereof, to the damped surface 2 of the damped object 1 with the damping member 3, and by inserting the damping member 3 into the hole 7. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention is a vibration noise reduction that suppresses vibration and noise of a vibration control object by attaching to the vibration suppression member a member capable of converting kinetic energy at the time of vibration in the vibration control object to heat energy. Concerning structure.

  Conventionally, there is a technology for attaching a cable or a wire to a vibration control object and absorbing the energy generated when the vibration of the vibration control object is absorbed by the cable or wire to suppress or attenuate the vibration of the vibration control object. Proposed. As an example, Patent Document 1 discloses an invention relating to a device for damping a hollow tower structure such as an illumination column or a lightning rod. In the tower-like structure with a vibration damping device described in Patent Document 1, the tower-like structure having a hollow portion inside has a cable in the hollow portion, and the upper end of the cable is fixed and hollow. It is comprised so that it may be in the state which drooped in the part, or the state to which the lower end was fixed. Therefore, according to such a structure, when the tower-like structure vibrates, the cable collides with the inner wall of the tower-like structure and the structure of the cable has an effect of damping the vibration of the tower-like structure. I can expect.

  Patent Document 2 discloses a structure that is suspended from a structure to be damped and has an elastic string-like elastic member, specifically, a cable formed by twisting a plurality of strands. An invention relating to a vibration damping device for an object is described. According to the structure damping device described in Patent Document 2, for example, during an earthquake, the energy of the earthquake can be absorbed by the vibration of the cable, and the vibration of the structure can be suppressed. Since the cable is a combination of strands, an almost optimum attenuation constant can be obtained by friction between the strands that occurs when the cable vibrates and deforms.

  Patent Document 3 discloses a steel plate that is bolt-bonded to the inner wall of a portion where the vibration (sound pressure) of the transmission case is high, the vibration direction of the inner wall is substantially equal to the natural frequency, and both ends thereof are free ends. A soundproofing device having a configuration in which is attached is described. According to the soundproofing device described in Patent Document 3, a dynamic damper is attached to the inner wall of the high sound pressure portion of the mission case, the vibration direction and the natural frequency being substantially equal to the high sound pressure portion. By virtue of the resonance action of the dynamic damper, the vibration of the high sound pressure portion of the transmission case can be suppressed and the sound pressure can be reduced, so that the vibration noise of the transmission case can be effectively reduced.

  Further, in Patent Document 4, both ends are fixed in a state where a chain or wire rope has a slack in the middle inside a horizontal hollow cross-section member, and this horizontal hollow member is attached to a horizontal member such as an illumination column. Further, the invention relates to a damping floor panel that dissipates vibration energy and suppresses the horizontal member by repeating the collision of the chain or wire rope against the inner wall of the horizontal hollow member when the horizontal hollow member vibrates in the horizontal direction. Is described.

JP 2003-328590 A JP 2000-353880 A JP 11-254983 A Japanese Patent Laid-Open No. 9-67877

  As in the invention described in Patent Document 1 or 2, the vibration suppression object vibrates by attaching a linear member such as a cable or a wire in which a plurality of wires are wound together to the vibration suppression object. The kinetic energy is absorbed by the linear member, or friction (heat) is generated inside the linear member due to the kinetic energy, and as a result, the kinetic energy is converted into thermal energy. Can be suppressed.

  In order to obtain a large damping effect for this linear member, it is desirable to obtain a large vibration at the other end by fixing one end of the linear member. However, in this structure, since the linear member interferes with adjacent components by receiving a large vibration, the linear member may be caught in the adjacent member or the linear member may be damaged. In addition, when a plurality of linear members are installed, the possibility of interference with adjacent components increases, so that the linear members may be caught in the adjacent members or the linear members may be damaged. .

  Further, in the invention described in Patent Document 3, the bolted steel plate is configured as a dynamic damper with both ends as free ends, so that the steel plate does not interfere with the transmission and other parts. The transmission structure must be designed in consideration of the spatial arrangement, and the design cost of the structure and parts of the vibration suppression target surface increases.

  And since the invention described in the above-mentioned patent document 4 is a mode in which the chain is suspended in the direction of gravity, the chain must always be manufactured in consideration of gravity. With constraints. Further, in the present invention, since both ends of the chain are fixed, the movement due to the vibration of the chain is limited, and therefore the vibration suppressing effect is not sufficiently generated.

  The present invention has been made by paying attention to the above technical problem, and can obtain a sufficient vibration / noise suppression effect by using a member capable of converting kinetic energy into heat energy. It is an object of the present invention to provide a vibration noise reduction structure that can prevent the interference.

  In order to achieve the above object, the invention of claim 1 is a vibration noise reduction structure in which a damping member is fixed to a damping target surface of a damping object so as to generate a free end. A protrusion having an inner peripheral hole larger than the outer periphery of the damping member attached to a rigid rod-like member, and one of the rod-like members as a free end, and the rod-like member together with the damping member of the damping object. The damping member is fixed to a surface to be damped, and the damping member is inserted into the hole.

  Therefore, according to the invention of claim 1, when the vibration control object vibrates, the vibration is transmitted to the linear member and the rod-shaped member. Since this rod-shaped member has higher rigidity than the linear member, the resonance frequency of vibration between the linear member and the rod-shaped member is different. For this reason, the linear member and the rod-like member have different vibration periods, and the contact between the inner periphery of the hole and the outer periphery of the linear member generates thermal energy due to friction. That is, a part of the kinetic energy due to the vibration of the vibration control object is converted into heat energy. Therefore, the vibration and noise of the vibration control object are reduced.

(First embodiment)
The present invention will be described based on specific examples. FIGS. 1A and 1B are schematic views for explaining a first embodiment of the vibration suppressing structure according to the present invention. In FIG. 1A, reference numeral 1 denotes a vibration suppression object according to the present invention. Here, an example of a configuration in which a rear cover of a transmission case mounted on a vehicle is used as the vibration suppression object 1 is shown.

  In FIG. 1, a line corresponding to the damping member in this invention is applied to the damping target surface 2 corresponding to the surface of the damping target 1 that mainly vibrates in the direction indicated by the arrow V1 (vertical direction in FIG. 1A). A shaped member 3 is attached. This linear member 3 is formed in layers from the center of this member to the outer periphery. Further, in FIG. 1B, the cross section of the linear member 3 is circular, but this cross section may be triangular, quadrangular, or other polygonal shapes.

  A rod-like member 4 formed in a rod shape is attached to the vibration suppression target surface 2 so as to be substantially parallel to the linear member 3. This rod-shaped member 4 is formed of a material having higher rigidity than the linear member 3 described above. In FIG. 1B, the rod-like member 4 has a circular cross section, but the cross section may be a triangle, a quadrangle, or another polygon.

  One end 3 a of the linear member 3 and one end 4 a of the rod-like member 4 are fixed to the vibration suppression target surface 2 of the vibration suppression target 1. The end portion 3a of the fixed linear member 3 and the end portion 4a of the fixed rod-like member 4 are attached so as to be at the same position on the vibration suppression target surface 2 or close to each other. The fixing method may be any fixing method that allows the vibration on the vibration-damping target surface 2 to be transmitted to the linear member 3. For example, any method such as adhesion or welding can be used. As an example, in FIG. 1A, the linear member 3 and the rod-shaped member 4 are inserted into a socket 5 in which the linear member 3 and the rod-shaped member 4 can be inserted. The structure to be attached to surface 2 is noted.

  A protrusion 6 is attached to the other end 4b of the rod-like member 4 or in the vicinity of the end 4b. The protrusion 6 is provided with a hole 7 so that the linear member 3 can be inserted. The inner periphery of the hole 7 is formed to be slightly larger than the outer periphery of the linear member 3. Moreover, since the rigidity of the rod-shaped member 4 is higher than that of the linear member 3, the resonance frequencies of the linear member 3 and the rod-shaped member 4 are different.

  Since the resonance frequency of the linear member 3 and the rod-shaped member 4 is different, the frequency of the vibration of the linear member 3 that vibrates due to the transmission of the vibration from the vibration control target surface 2 is different from the frequency of the vibration of the rod-shaped member 4. . For this reason, this linear member 3 and the hole 7 collide. And by this collision, a part of kinetic energy by the vibration of the vibration suppression target surface 2 is converted into thermal energy generated by the collision between the linear member 3 and the hole 7. Therefore, the kinetic energy due to the vibration of the vibration suppression target surface 2 is reduced, the vibration of the vibration suppression target surface 2 is reduced, and the noise is reduced.

  Moreover, since the inner periphery of the hole 7 provided in the projection part 6 is slightly larger than the outer periphery of the linear member 3, the amplitude in the place where the projection part 6 of the linear member 3 is attached is restrict | limited. . Therefore, it becomes possible to limit the amplitude of the whole linear member 3 within a certain width, and interference with other parts can be avoided.

(Second embodiment)
The present invention will be described based on specific examples. FIG. 2 is a schematic view for explaining a second embodiment of the vibration suppressing structure according to the present invention. The same reference numerals as those in FIG. 1 are attached to the same components as those in the first embodiment shown in FIG. 1, and detailed description thereof will be omitted. In the embodiment shown in FIG. 2, the vibration suppression target surface 2 of the vibration suppression target object 1 is bent, and the rod-like member 4 attached to the vibration suppression target surface 2 is at the bent portion of the vibration suppression target surface 2. Bend together.

  In the second embodiment, the rod-like member 4 is bent in accordance with the bent portion of the vibration suppression target surface 2. Therefore, it becomes possible to attach the rod-shaped member 4 so as to follow the vibration suppression target surface 2, and by causing the linear member 3 to follow the vibration suppression target surface 2, the distance between the vibration suppression target surface 2 and the linear member 3. Can be shortened. In other words, space saving can be achieved when the linear member 3 is attached to the vibration suppression target surface 2.

(Third embodiment)
The present invention will be described based on specific examples. FIGS. 3A and 3B are schematic views for explaining a third embodiment of the vibration suppressing structure according to the present invention. Parts similar to those in the first embodiment shown in FIGS. 1A and 1B are denoted by the same reference numerals as those in FIGS. 1A and 1B, and detailed description thereof will be given. Omitted. In the embodiment shown in FIGS. 3A and 3B, a plurality of holes 7 are provided in the protrusion 6. The linear members 3 are inserted into these holes 7, and the inner periphery of the holes 7 is configured to be slightly larger than the outer periphery of the linear member 3. Further, one end 3a of each of the linear members 3 is fixed to the vibration suppression target surface 2, and a rod-like member 4 is attached so as to be substantially parallel to one linear member 3 therein. . Therefore, in the third embodiment, the vibration noise reduction structure is configured by the plurality of linear members 3 and the single bar-like member 4.

  One end 4 a of the rod-like member 4 is fixed to the vibration suppression target surface 2 of the vibration suppression target 1. The end portion 3a of any one of the fixed linear members 3 and the end portion 4a of the fixed rod-like member 4 are attached so as to be at the same position or in the vicinity of the vibration suppression target surface 2. . Therefore, even when a plurality of linear members 3 are attached to the vibration suppression target surface, the vibration or noise of the vibration suppression target object 1 can be suppressed by using one bar-shaped member 4. Therefore, since a larger number of linear members 3 are used than the invention described in the first embodiment and the second embodiment, the invention described in the first embodiment and the second embodiment and In comparison, vibration or noise of the vibration control object 1 can be more effectively suppressed.

  The present invention is not limited to the configuration shown in the above specific example, and the specific example shows an example in which the vibration suppression object in the present invention is directed to the rear cover of the transmission case, for example. All members / parts, structures, and the like that can be applied to the vibration suppression target surface can be used as the vibration suppression target object. Moreover, the member used for the linear member 3 can divert the member of the existing simple structures, such as an electric cable.

It is a figure which shows typically the structure of 1st Example of this invention. It is a figure which shows typically the structure of the 2nd Example of this invention. It is a figure which shows typically the structure of the 3rd Example of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Transmission case (damping object), 2 ... Damping object surface, 3 ... Linear member, 4 ... Bar-shaped member, 5 ... Socket, 6 ... Projection part, 7 ... Hole.

Claims (1)

In the vibration noise reduction structure in which the damping member is fixed to the damping object surface of the damping object so as to produce a free end,
A protrusion that is attached to a rod-like member that is stiffer than the damping member and that has an inner peripheral hole larger than the outer periphery of the damping member; A vibration noise reduction structure, wherein the vibration suppression object is fixed to a vibration suppression target surface and the vibration suppression member is inserted into the hole.

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