Vibration control structure of bolt connected body

Abstract

To reduce vibration transmitted from a vibrator to a body to be vibrated (a vibrated body) through a bolt, thereby improving reliability of performance of an apparatus or a device.SOLUTION: In a vibration control structure of a bolt connected body, an elastic body 14 is provided between a vibrator 12 and a vibrated body 13. In a state that the elastic body 14 is sandwiched between the vibrator 12 and the vibrated body 13, the vibrator 12, the vibrated body 13, and the elastic body 14 are fastened by a bolt 15. A vibration control washer 20 is provided on a fastening surface, which is fastened by the bolt 15, of at least one of the vibrator 12 and the vibrated body 13. The vibration control washer 20 is formed of a carbon fiber-reinforced plastic having a thickness which is sufficient to absorb vibration transmitted from the vibrator 12 to the bolt 15.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a vibration-proof structure for a bolted connection body that is applicable to fields such as semiconductor equipment, electronic equipment, audio equipment, and automobile parts. [Background technology]

[0002] A bolted connection is a structure in which multiple parts are fastened together using bolts and nuts, or bolts alone. Compared to fastening methods such as welding, bolted connections are easier to dismantle and replace, and are therefore easier to maintain and repair, so they are used in a wide range of fields, including various types of machinery and equipment. Such bolt connections generally use sufficient tightening torque to firmly secure the components together, but in environments where vibrations occur in one component (the vibrator), the vibrations are transmitted directly to the other connected component (the vibrator), and this vibration can cause the bolts to loosen.

[0003] To address this issue, for example, a vibration-proof structure for bolted connections, as shown in Figure 7, is adopted. The bolted connector 1 has a vibrator 2, a vibrated body 3, and a bolt 5 and nut 6 for connecting them. An elastic body 4 made of rubber, silicon, or the like is sandwiched between the vibrator 2 and the vibrated body 3 to fix them in place. Bolt holes S penetrate the vibrator 2, the vibrated body 3, and the elastic body 4, and the shank 5b of a bolt 5 passes through this bolt hole S. A nut 6 is fastened to this shank 5b to fix the vibrator 2, the vibrated body 3, and the elastic body 4. Washers 7, 7 are provided on the fastening surfaces of the vibrator 2 and the vibrated body 3 by the bolt 5 (the fastening surfaces of the head 5a of the bolt 5 and the nut 6) to prevent loosening. In such a vibration-proof structure of the bolted connection body 1, the vibration of the vibrator 2 is absorbed by the elastic body 4, so that the vibration transmitted directly from the vibrator 2 to the vibrated body 3 can be reduced. Conventional vibration-proof structures for bolted connectors are known from Patent Document 1 and the like. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Utility Model Application Publication No. 2-110962 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in this conventional vibration-proof structure for a bolted connection, although the elastic body 4 can suppress the vibrations transmitted directly from the vibrator 2 to the vibrated body 3, there is a problem in that the vibrations of the vibrator 2 are transmitted indirectly to the vibrated body 3 via the bolt 5. 7, the vibration of the vibrator 2 is transmitted from the washer 7 on the head 5a side of the bolt 5 through the shank 5b to the nut 6, and then from the washer 7 on the nut 6 side to the vibrated body 3. Such vibrations generated in the vibrated body 3 via the bolt 5 can cause a decrease in the performance of equipment or devices that include the bolt connection 1.

[0006] The present invention has been made to solve these problems, and aims to provide a vibration-proof structure for a bolted connection that can improve the reliability of the performance of equipment and devices by reducing the vibration transmitted from the vibrator to the vibrated body via the bolt. [Means for solving the problem]

[0007] [First Invention] The vibration-proof structure for a bolted connection according to the present invention for solving the above problems comprises: A vibration-proof structure for a bolted connection body in which a vibrating body and a vibrating body are connected by a bolt, an elastic body provided between the vibrator and the vibrated body; the bolts fastening and fixing the vibrator, the vibration-damped body, and the elastic body in a state in which the elastic body is sandwiched between the vibrator and the vibration-damped body; a washer provided on a surface of at least one of the vibrator and the vibrated body that is fastened by the bolt, The washer is a vibration-damping washer made of carbon fiber reinforced plastic (hereinafter referred to as CFRP) and has a thickness that can absorb vibrations transmitted from the vibrator to the bolt.

[0008] According to the vibration-proof structure for a bolted connection of the first invention, the elastic body provided between the exciter and the receiver absorbs vibrations that are transmitted directly from the exciter to the receiver. In addition, the vibrations transmitted from the exciter to the receiver via the bolt are absorbed by the vibration-damping washer. In other words, the elastic body reduces vibrations that are transmitted directly from the exciter to the receiver, and the vibration-damping washer reduces vibrations that are transmitted indirectly via the bolt. This improves the reliability of the performance of equipment and devices that include the bolted connection. In the first aspect of the present invention, the vibration-damping washer is set to an appropriate thickness to sufficiently absorb the vibrations transmitted from the vibrator to the bolt. The specific thickness of the vibration-damping washer can be adjusted depending on the type of bolt connection, but it is desirable to set it to about 2 mm to 5 mm, preferably about 3 mm to 4 mm.

[0009] [Second Invention] The vibration-proof structure for a bolted connection according to the second invention has the configuration of the first invention, The vibration damping washer is The vibration-damping washer has a laminated structure in which a single layer of matrix resin and carbon fiber forming CFRP is laminated in the thickness direction of the vibration-damping washer, and in addition, The carbon fibers in a single layer of the laminated structure extend in parallel in a single direction via the matrix resin, and are arranged so as to maintain a gap between adjacent carbon fibers; and The carbon fibers in each layer of the laminated structure are arranged so as to overlap each other in the lamination direction, crossing each other at right angles for each layer of the laminated structure.

[0010] In the first aspect of the present invention, the arrangement of carbon fibers in CFRP is a factor that affects the elasticity and durability of the vibration-damping washer. In particular, the arrangement of carbon fibers is important in the thickness direction of the vibration-damping washer, because it is required to have sufficient pressure resistance (hardness) to ensure sufficient bolt tightening torque. In the configuration of the second invention, a laminated structure is formed in which single layers of matrix resin and carbon fibers forming CFRP are laminated in the thickness direction of the vibration-damping washer. The carbon fibers in the single layer of this laminated structure extend parallel to one another in a single direction via the matrix resin, and are arranged so that adjacent carbon fibers are spaced apart. The carbon fibers in each layer of the laminated structure are arranged so that they intersect perpendicularly in the stacking direction. In other words, the carbon fibers are stacked in a "grid" structure within the matrix resin. In this carbon fiber arrangement, matrix resin exists between adjacent parallel carbon fibers, and there is almost no matrix resin between adjacent carbon fibers that overlap in the stacking direction. As a result, the matrix resin mainly plays a role in absorbing the vibration energy of the bolt, and the carbon fibers mainly play a role in increasing the pressure resistance (hardness) of the vibration-damping washer in the thickness direction. In addition, the carbon fibers in the "Igeta" structure cross each other in a mesh pattern to support the matrix resin, increasing the planar rigidity of the vibration-damping washer and improving its resistance to tensile fracture (tear). As a result, it is possible to realize a vibration-proof structure for a bolted connection that can sufficiently increase the tightening torque of the bolt while reducing the vibration transmitted from the vibrator to the vibrated body via the bolt.

[0011] [Third Invention] The vibration-proof structure for a bolted connection according to the third invention has the configuration of the first invention, The vibration damping washer is A washer body; a shaft hole that penetrates the washer body in the thickness direction; a guide connected to the hole edge surface of the shaft hole and raised to the periphery of the shaft hole, When the vibrator, the vibrated body, and the elastic body are fastened and fixed with the bolts, the guide fits along the bolt hole of the vibrator or the vibrated body, and the shaft of the bolt is positioned on the inner periphery of this guide.

[0012] When the vibrator, the vibrated body, and the elastic body are fastened with bolts, the bolts are passed through these bolt holes. In the conventional configuration shown in Figure 7, when the bolt 5 is fastened, the washer 7 is likely to shift laterally from the bolt hole S, which can cause the bolt 5 to wobble. If the bolt 5 wobbles too much, the bolt 5 may be fastened in a state where the shank 5b of the bolt is in contact with the surface of the bolt hole S (see Figure 8). In this case, the vibration of the vibrator is transmitted directly from the shaft of the bolt to the vibrated body, which may impair the vibration absorption effect of the vibration-damping washer. According to the configuration of the third invention, the vibration-damping washer guide is fitted along the bolt hole when the bolt is tightened, preventing the vibration-damping washer from shifting sideways. Furthermore, when the bolt is passed through the bolt hole, the vibration-damping washer guide positions the bolt so that the bolt shank does not come into contact with the bolt hole surface. In other words, the bolt shank does not wobble in the bolt hole and come into contact with the bolt hole surface. This further enhances the reliability of vibration reduction provided by the vibration-damping washer.

[0013] [Fourth Invention] The vibration-proof structure for a bolted connection according to the fourth invention has the configuration of the third invention, The vibration damping washer further comprises: an annular groove provided on a surface of the washer body opposite to the guide so as to surround the shaft hole; and an O-ring that is fitted into the annular groove and fastened by the bolt.

[0014] According to the fourth aspect of the present invention, an O-ring is fastened by the bolt to the surface of the vibration-damping washer opposite the guide, and the elasticity of this O-ring also absorbs the bolt vibration, further reducing the vibration of the vibrator and further improving the reliability of the performance of equipment and devices that include the bolted connection. In addition, the O-ring can improve the sealing performance of the vibration damping washer, making it possible to prevent gases and liquids from entering the bolt holes.

[0015] [Fifth Invention] In the first to fourth aspects of the present invention, in order to improve the vibration-damping performance between the vibrator and the receiver, it is effective to use an elastic material such as rubber or silicone as the elastic body. Such elastic materials have excellent vibration absorption capabilities and can effectively suppress vibrations transmitted directly from the vibrator to the receiver. In addition, elastic materials are highly flexible and easily adhere to the irregular surfaces of the vibrator and receiver, making it difficult for gaps to form, which contributes to dispersing impact energy and reducing damage to the device caused by vibration. However, when an elastic material such as rubber or silicon is used as the elastic body, there is a problem in that minute displacements are likely to occur in the positions of the vibrator and the vibrated body due to their flexibility. In particular, in environments where stability is required in the relative position of the vibrator and the receiver, such as electronic devices and audio equipment, continuous micro-vibrations can cause the elastic body to compress and expand, resulting in minute displacements in the positions of the vibrator and receiver, which can have a negative impact on the performance of the entire device.

[0016] The vibration-proof structure for a bolted connection according to the fifth aspect of the present invention has the following configuration in order to solve the above problems. That is, it has the configuration of the second invention, The elastic body is made of a plate material made of CFRP, and has a laminated structure in which a single layer of matrix resin and carbon fiber forming this CFRP is laminated in the plate thickness direction of the plate material sandwiched between the vibrator and the vibrating body, and in addition, The carbon fibers in a single layer of the laminated structure extend in parallel in a single direction via the matrix resin, and are arranged so as to maintain a gap between adjacent carbon fibers; and The carbon fibers in each layer of the laminated structure are arranged so as to overlap each other in the lamination direction, crossing each other at right angles for each layer of the laminated structure.

[0017] In the configuration of the fifth invention, the elastic body sandwiched between the vibrator and the vibrated body is a plate made of CFRP, and this CFRP has a laminated structure in which single layers of matrix resin and carbon fiber are stacked in the plate thickness direction. The carbon fibers in each layer of this laminated structure extend parallel to one another in a single direction through the matrix resin, and are arranged so that adjacent carbon fibers are spaced apart. The carbon fibers in each layer of the laminated structure are arranged so that they intersect perpendicularly in the lamination direction. In other words, the carbon fibers are stacked in the matrix resin in a "grid" structure. In such an arrangement of carbon fibers, the matrix resin is present between adjacent parallel carbon fibers, and there is almost no matrix resin between adjacent carbon fibers that overlap in the stacking direction. According to the configuration of the fifth aspect of the present invention, the CFRP structure described above allows adjacent carbon fibers stacked in the stacking direction to prevent displacement of the relative positions of the exciter and the vibrator. Meanwhile, the matrix resin between the carbon fibers in each layer absorbs the vibration energy of micro-vibrations. In other words, micro-vibrations can be suppressed while maintaining the relative positions of the exciter and the vibrator in a fixed position.

[0018] In addition, as explained in the second aspect of the invention, the configuration of the fifth aspect of the invention allows vibrations transmitted from the vibrator to the vibrated body via the bolts to be absorbed by a vibration-damping washer made of CFRP. As mentioned above, this vibration-damping washer also has carbon fibers stacked in a "grid" structure within the matrix resin, so it can absorb vibration energy without causing minute displacement due to micro-vibrations. As a result, even if continuous micro-vibrations occur in environments where stability is required in the relative position of the vibrator and the receiver, such as electronic devices and acoustic equipment, the micro-vibrations can be effectively suppressed without degrading the performance of the entire device.

[0019] [Sixth Invention] The vibration-proof structure for a bolted connection according to the sixth invention comprises: A vibration-proof structure for a bolted connection body in which a vibrating body and a vibrating body are connected by a bolt, an elastic body provided between the vibrator and the vibrated body; the bolts fastening and fixing the vibrator, the vibration-damped body, and the elastic body in a state in which the elastic body is sandwiched between the vibrator and the vibration-damped body; a washer provided on a surface of at least one of the vibrator and the vibrated body that is fastened by the bolt, The elastic body is made of a plate material made of CFRP, and has a laminated structure in which a single layer of matrix resin and carbon fiber forming this CFRP is laminated in the plate thickness direction of the plate material sandwiched between the vibrator and the vibrating body, and in addition, The carbon fibers in a single layer of the laminated structure extend in parallel in a single direction via the matrix resin, and are arranged so as to maintain a gap between adjacent carbon fibers; and The carbon fibers in each layer of the laminated structure are arranged so as to overlap each other in the lamination direction, crossing each other at right angles for each layer of the laminated structure.

[0020] The configuration of the sixth invention employs a CFRP plate, similar to that of the fifth invention, as the elastic body provided between the vibrator and the vibrated body. As mentioned above, in this CFRP plate, the carbon fibers are stacked in a matrix resin in a "grid" structure. This makes it possible for the configuration of the sixth invention to absorb vibration energy caused by minute vibrations without causing minute displacements in the positions of the vibrator and the vibrated body.

[0021] [1st to 6th Inventions] In the first to sixth aspects of the present invention, various types of bolts can be used to connect the vibrator and the vibrated body. They may be of a type in which a nut is fastened to one end of the bolt, or a type in which nuts are fastened to both ends of the bolt (a stud bolt). Furthermore, the vibrator and the vibrated body may be fastened together only by the bolt. In the first to sixth inventions, the matrix resin forming the CFRP may be a thermosetting resin such as an epoxy resin, an unsaturated polyester, a vinyl ester, a phenol, a cyanate ester, or a polyimide, or a thermoplastic resin such as a polyamide, a polycarbonate, a polyphenylene sulfide, or a polyether ether ketone. As the carbon fiber for CFRP, for example, PAN (polyacrylonitrile) based carbon fiber, pitch based carbon fiber, etc. can be used. [Brief explanation of the drawings]

[0022] [Figure 1] 1 is a cross-sectional view showing a vibration-proof structure for a bolted connection body according to a first embodiment of the present invention. [Figure 2] FIG. 2 is a partially enlarged view of the vibration-proof structure according to the embodiment. [Figure 3] 1A and 1B show a vibration-damping washer used in the vibration-damping structure according to the embodiment, in which FIG. 1A is a perspective view of the annular groove side, and FIG. 1B is a perspective view of the guide side. [Figure 4] 1A and 1B show a vibration-damping washer used in the vibration-proof structure according to the embodiment, in which (A) is a schematic cross-sectional view illustrating the resin layer of the CFRP, and (B) is a three-dimensional schematic view illustrating the arrangement of the carbon fibers of the CFRP. [Figure 5] FIG. 6 is a partially enlarged view showing a vibration-proof structure for a bolted connection body according to a second embodiment of the present invention. [Figure 6] FIG. 10 is a cross-sectional view showing a vibration-proof structure for a bolted connection body according to another embodiment (modification). [Figure 7] FIG. 10 is a cross-sectional view showing a conventional vibration-proof structure for a bolted connection body. [Figure 8] FIG. 2 is a partially enlarged view of the vibration-proof structure according to the conventional embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0023] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the embodiments described below are examples of application of the present invention, and the scope of the invention is not limited to these embodiments.

[0024] [First embodiment] Figure 1 shows the vibration-proof structure of the bolted connector. As shown in Fig. 1, the bolted connection body 10 includes a vibrator 12, a vibrated body 13, and an elastic body 14. With the elastic body 14 sandwiched between the vibrator 12 and the vibrated body 13, these are connected and fixed with a bolt 15 and a nut 16. A bolt hole S penetrates the vibrator 12, the vibrated body 13, and the elastic body 14, and a bolt 15 is passed through this bolt hole S. A nut 16 is tightened onto the tip end of this bolt 15. The bolt 15 is a cap bolt and has a head 15a and a shaft 15b. A male thread is cut on the tip end of the shaft 15b, and the female thread of the nut 16 is screwed into this male thread portion.

[0025] The elastic body 14 is formed by cutting a plate made of an elastic material such as rubber or silicone to fit the connecting surfaces of the vibrator 12 and the vibrated body 13. It is placed with a substantially uniform thickness between the vibrator 12 and the vibrated body 13. The vibrator 12 is in close contact with one plate surface of the elastic body 14, and the vibrated body 13 is in close contact with the plate surface on the opposite side, and they are fastened together by bolts 15. It is of course also possible to use a plate made of CFRP as the elastic body 14. In this way, by sandwiching the elastic body 14 between the vibrator 12 and the vibrated body 13, the vibration of the vibrator 12 is absorbed by the elastic body 14 without being transmitted directly to the vibrated body 13.

[0026] Damping washers 20, 20 are provided on the surfaces of the vibrator 12 and the vibrated body 13 that are fastened by the bolt 15. The damping washer 20 on the vibrator 12 side is pressed against the fastening surface of the vibrator 12 by the head 15a of the bolt 15. The damping washer 20 on the vibrated body 13 side is pressed against the fastening surface of the vibrated body 13 by the nut 16. This prevents loosening of the tightening torque of the bolt 15 and nut 16 at these fastening surfaces.

[0027] The vibration-damping washers 20, 20 are integrally formed from CFRP and have a thickness that allows them to absorb vibrations transmitted from the vibrator 12 to the bolt 15. Specifically, as shown in Fig. 2, the thickness d of the vibration-damping washer 20 is set to about 3 to 4 mm. As a result, the vibration-damping washer 20 (mainly the matrix resin portion), which will be described later, has an appropriate elasticity that allows it to absorb vibrations from the bolt 15.

[0028] As shown in Figure 3, vibration-damping washer 20 comprises a washer body 21, a shaft hole T, a guide 22, and an annular groove 23. The shaft hole T penetrates the center of the circular washer body 21, maintaining a constant diameter. As shown in Figure 3(B), on one side of the washer body 21, a cylindrical guide 22 is connected to the edge surface of the shaft hole T and rises up from the periphery of the shaft hole T. On the surface of the washer body 21 opposite the guide 22, an annular groove 23 is provided along the open edge so as to surround the shaft hole T (see Figure 3(A)). The surface of the vibration-damping washer 20 on the annular groove 23 side is decorated with a textured pattern (for example, a CFRP plain weave pattern) that indicates that it is made of CFRP.

[0029] The outer diameter of guide 22 is set to a dimension that fits along bolt hole S of bolt 15 (see FIG. 2). The outer diameter of guide 22 is slightly smaller than bolt hole S, and the inner diameter of guide 22 is slightly larger than shank 15b of bolt 15. This allows guide 22 to fit almost snugly into bolt hole S when the bolt is passed through vibration-damping washer 20.

[0030] The annular groove 23 extends along the edge of the shaft hole T, cutting it out perpendicular to the cross section. The outer diameter of the annular groove 23 is larger than that of the shaft hole T and is approximately equal to the outer diameter of the guide 22 described above. As shown in FIG. 2, an O-ring 24 made of an elastic material such as rubber or silicone is fitted into the annular groove 23. The O-ring 24 is sandwiched between the vibration-damping washer 20, the nut 16, and the bolt 15 (shaft 15b) and is kept in an elastically deformed state. This serves to absorb vibrations between them. In addition, the O-ring 24 fitted into the annular groove 23 enhances the sealing performance of the vibration damping washer 20 and also serves to prevent gas or liquid from entering the bolt hole S. Although Figure 2 shows the vibration-damping washer 20 on the vibration-excited body 13 side, the vibration-damping washer 20 on the vibration-exciting body 12 side also has a guide 22 that fits into the bolt hole S and an O-ring that fits into the annular groove 23, thereby providing vibration absorption and sealing effects.

[0031] When manufacturing the vibration-damping washer 20, for example, a UD material prepreg (carbon fiber sheet) in which the carbon fibers are arranged in a single direction is prepared. This sheet is cut to the same dimensions lengthwise and widthwise, and stacked so that the carbon fibers cross each other at right angles. After stacking to the thickness of the vibration-damping washer 20 (including the guide 22), it is molded while being compressed at a predetermined pressure and temperature (autoclave molding). This molding method makes it possible to produce a CFRP plate material in which the carbon fibers are arranged and stacked in a "cross pattern" as described above. A washer-shaped intermediate product is cut out from this plate material, and the guide 22 and the annular groove 23 are formed by cutting, thereby manufacturing the vibration-damping washer 20.

[0032] Figure 4 shows a schematic diagram of the laminated structure of the vibration damping washer. As shown in FIG. 4(A), the vibration-damping washer 20 has a laminated structure (see FIG. 4(B)) in which a matrix resin P and carbon fibers C are laminated in the thickness direction. In a single layer of the laminated structure, the carbon fibers C extend parallel to one another in a single direction via the matrix resin P, and are arranged so that adjacent carbon fibers C are spaced apart. In each layer of the laminated structure, the carbon fibers C are arranged so that they overlap each other perpendicularly in the lamination direction. The carbon fibers C overlapping above and below are in close contact with each other, with no gaps between them. Specifically, in Figure 4(B), the carbon fibers C in the bottom (first) layer are overlapped with the carbon fibers C in the second layer at approximately 90° crossing, and the carbon fibers C in the third layer are overlapped with the carbon fibers C at another 90° crossing. The carbon fibers C in the fourth to fifth layers are overlapped with the carbon fibers C crossing at 90° in a similar manner. The carbon fibers C in the first, third, and fifth layers are oriented in the same direction, and the carbon fibers C in the second, fourth, and sixth layers are oriented in the same direction, perpendicular to these. In other words, the carbon fibers C of each layer are overlapped in a "cross-like" structure with the matrix resin P interposed therebetween.

[0033] By arranging the carbon fibers C in this manner, the matrix resin P is present between adjacent parallel carbon fibers C, and there is almost no matrix resin P between adjacent carbon fibers C that overlap in the stacking direction. As a result, the matrix resin P mainly plays a role in absorbing the vibration energy of the bolt 15, and the carbon fibers C mainly play a role in increasing the pressure resistance (hardness) of the vibration damping washer 20 in the thickness direction. In addition, the carbon fibers C of the "cross braid" cross each other in a mesh pattern to support the matrix resin P, thereby increasing the planar rigidity of the vibration-damping washer 20 and improving its resistance to tensile fracture (tear).

[0034] As described above, according to the vibration-proof structure of the bolted connection 10, the elastic body 14 provided between the exciter 12 and the vibrator 13 absorbs vibrations that are transmitted directly from the exciter 12 to the vibrator 13. In addition, the vibrations that are transmitted from the exciter 12 to the vibrator 13 via the bolt 15 are absorbed by the vibration-damping washers 20, 20. Because the vibrations that are transmitted directly from the exciter 12 to the vibrator 13 are attenuated by the elastic body 14, and the vibrations that are transmitted indirectly via the bolt 15 are attenuated by the vibration-damping washers 20, 20, the reliability of the performance of equipment and devices that include the bolted connection can be improved. Furthermore, in the CFRP forming the vibration-damping washer 20, the carbon fibers C are arranged in a "cross-lattice" structure via the matrix resin P, which allows the vibration-damping washer 20 to maintain good pressure resistance (hardness) and planar rigidity while maintaining an appropriate degree of elasticity. As a result, the tightening torque of the bolt 15 can be sufficiently increased while reducing the vibration transmitted from the vibrator 12 to the vibrated body 13 via the bolt 15.

[0035] Furthermore, according to the vibration-proof structure of the bolt connection body 10, the guide 22 of the vibration-damping washer 20 is fitted along the bolt hole S when the bolt 15 is tightened, thereby preventing lateral displacement of the vibration-damping washer 20. Furthermore, when the bolt 15 is passed through the bolt hole S, the guide 22 of the vibration-damping washer 20 positions the shank 15b of the bolt 15 so that it does not come into contact with the hole surface of the bolt hole S. This prevents the shank 15b of the bolt 15 from wobbling in the bolt hole S and coming into contact with the hole surface of the bolt hole S, further improving the reliability of the vibration reduction provided by the vibration-damping washer 20.

[0036] Furthermore, according to the vibration-proof structure of the bolt connection 10, the O-ring 24 is fastened by the bolt 15 to the surface of the vibration-damping washer 20 opposite the guide 22, and the elasticity of this O-ring 24 also absorbs the vibration of the bolt 15. This further reduces the vibration of the vibrator 12, further improving the reliability of the performance of equipment and devices that include the bolt connection 10. In addition, the O-ring 24 improves the sealing performance of the vibration damping washer 20, making it possible to prevent gas or liquid from entering the bolt hole S.

[0037] [Second embodiment] In the first embodiment described above, an example was described in which CFRP was used as the material for the vibration-damping washer 20, in which carbon fibers C are overlapped in a "cross-lattice" structure with matrix resin P interposed therebetween. In the second embodiment, a similar CFRP is used not only for the vibration-damping washer 20 but also for the elastic body 14. The basic configuration of the bolt connection body according to the second embodiment is the same as that of the first embodiment (see FIG. 1). In the second embodiment, as shown in FIG. 5, the elastic body 14 is formed of a plate material made of CFRP. This CFRP has a laminated structure (see FIG. 4(B)) in which a matrix resin P and carbon fibers C are laminated in the plate thickness direction of the plate material. That is, in a single layer of the laminated structure, the carbon fibers C extend in parallel in a single direction via the matrix resin P, and are arranged so that a space is maintained between the adjacent carbon fibers C. In each layer of the laminated structure, the carbon fibers C are arranged so that they overlap each other perpendicularly in the lamination direction. The carbon fibers C overlapping above and below are in close contact with each other, with no gaps between them. In other words, the carbon fibers C of each layer are overlapped in a "cross-like" structure with the matrix resin P interposed therebetween.

[0038] By arranging the carbon fibers C in this manner, the matrix resin P is present between adjacent parallel carbon fibers C, and there is almost no matrix resin P between adjacent carbon fibers C that overlap in the stacking direction. This prevents adjacent carbon fibers C that overlap in the stacking direction from shifting in their relative positions to the vibrator 12 and the vibrated body 13. Meanwhile, the matrix resin P between the carbon fibers C in each layer absorbs the vibration energy of micro-vibrations. In other words, micro-vibrations can be suppressed while maintaining the relative positions of the vibrator 12 and the vibrated body 13 in a fixed position.

[0039] Additionally, in the bolt connection of the second embodiment, the vibration absorbing and pressure-resistant functions of the vibration damping washer 20 described above also enable vibration energy to be absorbed without causing minute displacement due to minute vibrations. As a result, even if continuous micro-vibrations occur in an environment where stability is required in the relative position of the vibrator and the receiver, such as in electronic devices or acoustic equipment, the micro-vibrations can be effectively suppressed without degrading the performance of the entire device.

[0040] [Variations] Although the vibration-proof structures of the bolt connector 10 of the first and second embodiments have been described, the embodiments of the present invention are not limited to these and may involve various modifications. For example, the present invention can be applied to a bolt connection including a motor and a sensor. 6(A), the bolt connecting body 30 includes a vibrator 12 including a motor 12a and a housing 12b, and a vibrated body 13 including a sensor 13a and a base 13b. The motor 12a is fixed to a predetermined position within the housing 12b, and the sensor 13a is fixed to a predetermined position on the base 13b. An elastic body 14 is sandwiched between the vibrator 12 (housing 12b) and the vibrated body 13 (base 13b). Bolts 15 are passed through bolt holes that pass through these bodies and are fastened with nuts 16. Vibration-damping washers 20 are provided on the surfaces of the vibrator 12 (housing 12b) and the vibrated body 13 (base 13b) that are fastened by the bolts 15. The vibration-damping washers 20 have substantially the same configuration as those described in the first embodiment, and the elastic body 14 has substantially the same configuration as those described in the second embodiment.

[0041] According to the vibration-proof structure of the bolted connection body 30, when the motor 12a vibrates, the vibration is transmitted to the housing 12b and absorbed by the elastic body 14. On the other hand, the vibration transmitted from the housing 12b to the base 13b of the sensor 13a is absorbed by the vibration-damping washer 20 made of CFRP. The vibrations transmitted directly from the vibrator 12 (housing 12b) to the vibrated body 13 (base stand 13b) are reduced by the elastic body 14, and the vibrations transmitted indirectly via the bolt 15 are reduced by the vibration-damping washer 20, thereby improving the reliability of the performance of equipment and devices including the bolt connector 30. Furthermore, the vibration-proof structure of the bolted connection body 30 can absorb vibration energy while suppressing minute displacements caused by minute vibrations of the vibrator 12 (motor 12a and housing 12b) due to the CFRP structure used for the vibration-damping washer 20 and the elastic body 14. As a result, even if continuous minute vibrations occur in the bolted connection body 30, the minute vibrations can be effectively suppressed without deteriorating the performance of the entire device. In the embodiment shown in FIG. 6(A), the vibration-proof structure of the present invention is applied to the bolt connection between the housing 12b and the base 13b, but in other embodiments, the vibration-proof structure of the present invention may be applied to the bolt connection between the motor 12a and the housing 12b.

[0042] As shown in FIG. 6(B), the present invention can also be applied to a bolted connection including a speaker that serves as a vibration source. The bolted connection body 40 includes a vibrator 12 including a speaker 12c and a fixture 12d, and a wall body, that is, a vibration receiver 13. The speaker 12c is fixed to the support of the fixture 12d. An elastic body 14 is sandwiched between the vibrator 12 (fixing device 12d) and the vibrated body 13 (wall body). A bolt 15 is passed through a bolt hole communicating with these and fastened to the female thread of the vibrated body 13 (wall body). A vibration-damping washer 20 is provided on the surface of the vibrator 12 (fixing device 12d) fastened by the bolt 15. The vibration-damping washer 20 has substantially the same configuration as that described in the previous embodiment, and the elastic body 14 has substantially the same configuration as that described in the second embodiment.

[0043] According to the vibration-proof structure of the bolted connecting body 40, when the speaker 12c vibrates, the vibration is transmitted to the fixing device 12d and absorbed by the elastic body 14. On the other hand, the vibration transmitted from the fixing device 12d to the vibration-receiving body (wall body) 13 is absorbed by the vibration-damping washer 20 made of CFRP. The vibrations transmitted directly from the vibrator 12 (fixing device 12d) to the vibrated body (wall body) 13 are reduced by the elastic body 14, and the vibrations transmitted indirectly via the bolt 15 are reduced by the vibration-damping washer 20, thereby improving the reliability of the performance of equipment and devices including the bolt connector 40. Furthermore, the vibration-proof structure of the bolted connection body 40 can absorb vibration energy while suppressing minute displacements caused by micro-vibrations of the vibrating body 12 (speaker 12c and fixture 12d) due to the CFRP structure used for the vibration-damping washer 20 and the elastic body 14. As a result, even if continuous micro-vibrations occur in the bolted connection body 40, the micro-vibrations can be effectively suppressed without deteriorating the performance of the entire device.

[0044] In the above-described embodiment, cap bolts are used as the bolts of the bolt connector, but other bolts that can use washers may be used. For example, hexagonal bolts, hexagonal socket head bolts, flange bolts, butterfly bolts, etc. may also be used, or stud bolts with nuts screwed into both ends of the shaft may also be used. Furthermore, the arrangement of the carbon fibers in the CFRP may be modified from that shown in Figure 4(B) as long as sufficient pressure resistance (hardness) can be ensured in the thickness direction of the vibration-damping washer. For example, the carbon fibers C can be arranged in the resin layer in a plain weave (where warp and weft threads cross each other alternately) or a twill weave. Furthermore, some of the overlapping carbon fibers C can be arranged so that they cross at an angle of 45° or more when viewed from the stacking direction. When a structure in which the carbon fibers C are stacked at 45° intervals is adopted, the torsional rigidity of the vibration-damping washer is significantly improved. The annular groove 23 is configured so as to extend along the open end of the axial hole T of the vibration damping washer 20 on the surface opposite the guide 22, but alternatively, it may be configured at a position away from the axial hole T so as to surround the coaxial hole T. [Explanation of symbols]

[0045] 10. Bolt connector 12. Vibration body 13... Vibrated object 14. Elastic body 15 volts 15a·Head 15b·Shaft part 16 Nut 20··Vibration damping washer 21 Washer body 22 Guide 23 Annular groove 24 O-ring C·Carbon fiber H...Laminated structure P··Matrix Resin S··Bolt hole T··shaft hole

Claims

1. A vibration-proof structure for a bolted connection body in which a vibrating body and a vibrating body are connected by a bolt, an elastic body provided between the vibrator and the vibrated body; the bolts fastening and fixing the vibrator, the vibration-damped body, and the elastic body in a state in which the elastic body is sandwiched between the vibrator and the vibration-damped body; a washer provided on a surface of at least one of the vibrator and the vibrated body that is fastened by the bolt, A vibration-proof structure for a bolt connection, characterized in that the washer is a vibration-damping washer made of carbon fiber reinforced plastic (hereinafter referred to as CFRP) having a thickness sufficient to absorb vibrations transmitted from the vibrator to the bolt.

2. The vibration-proof structure according to claim 1, The vibration damping washer is The vibration damping washer has a laminated structure in which a single layer of matrix resin and carbon fiber forming CFRP is laminated in the thickness direction of the vibration damping washer, and in addition, The carbon fibers in a single layer of the laminated structure extend in parallel in a single direction via the matrix resin, and are arranged so as to maintain a gap between adjacent carbon fibers; and A vibration-proof structure for a bolt connection body, wherein the carbon fibers in each layer of the laminated structure are arranged so as to overlap each other in the laminated direction, perpendicular to each other for each layer of the laminated structure.

3. The vibration-proof structure according to claim 1, The vibration damping washer is A washer body; a shaft hole that penetrates the washer body in the thickness direction; a guide connected to the hole edge surface of the shaft hole and raised to the periphery of the shaft hole, When the vibrator, the vibrated body, and the elastic body are fastened together with the bolts, the guide fits along the bolt hole of the vibrator or the vibrated body, and the shank of the bolt is positioned on the inner periphery of this guide.

4. The vibration-proof structure according to claim 3, The vibration damping washer further comprises: an annular groove provided on a surface of the washer body opposite to the guide so as to surround the shaft hole; an O-ring fitted in the annular groove and tightened by the bolt.

5. The vibration-proof structure according to claim 2, The elastic body is made of a plate material made of CFRP, and has a laminated structure in which a single layer of matrix resin and carbon fiber forming the CFRP is laminated in the plate thickness direction of the plate material sandwiched between the vibrator and the vibrated body, and in addition, The carbon fibers in a single layer of the laminated structure extend in parallel in a single direction via the matrix resin, and are arranged so as to maintain a gap between adjacent carbon fibers; and A vibration-proof structure for a bolt connection body, wherein the carbon fibers in each layer of the laminated structure are arranged so as to overlap each other in the laminated direction, perpendicular to each other for each layer of the laminated structure.

6. A vibration-proof structure for a bolted connection body in which a vibrating body and a vibrating body are connected by a bolt, an elastic body provided between the vibrator and the vibrated body; the bolts fastening and fixing the vibrator, the vibration-damped body, and the elastic body in a state in which the elastic body is sandwiched between the vibrator and the vibration-damped body; a washer provided on a surface of at least one of the vibrator and the vibrated body that is fastened by the bolt, The elastic body is made of a plate material made of CFRP, and has a laminated structure in which a single layer of matrix resin and carbon fiber forming the CFRP is laminated in the plate thickness direction of the plate material sandwiched between the vibrator and the vibrated body, and in addition, The carbon fibers in a single layer of the laminated structure extend in parallel in a single direction via the matrix resin, and are arranged so as to maintain a gap between adjacent carbon fibers; and 10. A vibration-proof structure for a bolted connection, wherein the carbon fibers in each layer of the laminated structure are arranged so as to overlap each other in the lamination direction, perpendicular to each other, for each layer of the laminated structure.

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