JP7820996B2 - Vibration suppressor - Google Patents

Description

This disclosure relates to a vibration suppression device for suppressing vibrations in multiple pipes.

Pipes connected to ships, construction machinery, industrial machinery, vehicles, etc. vibrate due to factors such as fuel supply and engine rotation, so vibration suppression devices are provided to suppress this vibration. Patent Document 1 discloses a vibration suppression device that includes elastic damping materials wrapped around the outer peripheries of adjacent pipes, connecting members that connect the damping members together, and additional mass bodies that are connected to the connecting members and add mass.

JP 2014-126122 A

Engine piping structures often have multiple branch pipes branching off from one main pipe. Particularly in engines with a large number of cylinders, the main pipe is arranged longitudinally along the engine, with branch pipes arranged to correspond to the position of each cylinder. It is difficult to secure space between each cylinder and the main pipe to attach components to support the branch pipes. Additionally, the rigidity of branch pipes is relatively low compared to their own weight, which tends to result in a low natural frequency.

On the other hand, the engine's vibratory force exists at a frequency whose pitch is a multiple of the engine speed. In engines with a large number of cylinders, the engine's vibratory force can become large, even up to higher-order components. If the engine's vibratory force components and the natural frequency of the branch pipes are close to each other, the pipes may vibrate violently due to resonance, potentially resulting in damage to the pipes.

According to the vibration suppression device described in Patent Document 1, by wrapping a vibration-damping material made of an elastic body around the outer circumference of a pipe, it is possible to exert damping capacity against vibrations in multiple directions. However, due to the structure of the vibration suppression device, it is difficult to effectively exert the damping capacity of the vibration-damping material, and there is a problem that the effect of suppressing vibrations is low.

In light of the above circumstances, at least one embodiment of the present invention aims to provide a vibration suppression device that can effectively suppress vibrations in multiple pipes.

A vibration suppression device according to at least one embodiment of the present invention comprises:
A vibration suppression device for suppressing vibration of a plurality of pipes,
the plurality of pipes include a first pipe having a first horizontal portion extending along a first direction, and a second pipe having a second horizontal portion extending along the first direction and spaced apart from the first horizontal portion on one side of a second direction perpendicular to the first direction,
The vibration suppression device is
a first arm portion fixed to the first horizontal portion and extending from the first horizontal portion toward the second horizontal portion;
a second arm portion fixed to the second horizontal portion and extending from the second horizontal portion toward the first horizontal portion, the second arm portion being configured such that a first gap is formed between the second arm portion and the first arm portion along a third direction perpendicular to each of the first direction and the second direction;
a viscoelastic body provided in the first gap so as to abut against the first arm portion and the second arm portion.

At least one embodiment of the present invention provides a vibration suppression device that can effectively suppress vibrations in multiple pipes.

1 is a schematic perspective view of a plurality of pipes to which a vibration suppression device according to an embodiment is attached; 1 is a schematic cross-sectional view of a vibration suppression device according to an embodiment. 1 is a schematic cross-sectional view of a vibration suppression device according to an embodiment. 1 is a schematic cross-sectional view of a vibration suppression device according to an embodiment. 1 is a schematic cross-sectional view of a vibration suppression device according to an embodiment. 1 is a schematic cross-sectional view of a vibration suppression device according to an embodiment. 1 is a schematic cross-sectional view of a vibration suppression device according to an embodiment. 1 is a schematic cross-sectional view of a vibration suppression device according to an embodiment. 1 is a schematic cross-sectional view of a vibration suppression device according to an embodiment. 1 is a schematic cross-sectional view of a vibration suppression device according to an embodiment.

Several embodiments of the present invention will be described below with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of the components described as embodiments or shown in the drawings are not intended to limit the scope of the present invention and are merely illustrative examples.

(multiple pipes)
Fig. 1 is a schematic perspective view of a plurality of pipes 2 to which a vibration suppression device 1 according to one embodiment is attached. Each of Figs. 2 to 10 is a schematic cross-sectional view of a vibration suppression device according to one embodiment. In each of Figs. 2 to 10, a first direction is perpendicular to the plane of the drawing. The vibration suppression device 1 according to some embodiments is intended to suppress vibrations of a plurality of pipes 2 as shown in Fig. 1.

As shown in FIG. 1, each of the multiple pipes 2 has a horizontal portion extending along a first direction, and the horizontal portions are spaced apart along a second direction perpendicular to the first direction. Specifically, the multiple pipes 2 include at least a first pipe 21 having a first horizontal portion 22 extending along the first direction, and a second pipe 23 having a second horizontal portion 24 extending along the first direction. The second horizontal portion 24 is located to one side of the first horizontal portion 22 in the second direction (the lower right side in the figure).

As shown in FIG. 1, the multiple pipes 2 may further include a third pipe 25 having a third horizontal portion 26 extending along the first direction. The third horizontal portion 26 is located on the other side (upper left side in the figure) of the first horizontal portion 22, which is opposite the one side in the second direction.

In the illustrated embodiment, as shown in FIG. 1, each of the multiple pipes 2 consists of a branch pipe 13 connected at one end 141 to a main pipe 12 extending along the second direction. The main pipe 12 extends along the arrangement direction of the multiple cylinders 11 arranged in a row in the engine 10. The second direction is the arrangement direction of the multiple cylinders 11.

In the illustrated embodiment, as shown in FIG. 1, each of the multiple pipes 2 (branch pipes 13) includes a first straight portion 14 extending from one end 141 connected to the main pipe 12 along a direction intersecting (orthogonal in the illustrated example) each of the first and second directions, and a second straight portion 15 extending from the other end 142 of the first straight portion 14 along the first direction. The second straight portion 15 has one end 151 connected to the other end 142 of the first straight portion 14 and the other end 152 connected to the cylinder 11.

The following describes a case where the first horizontal section 22 is made up of the second straight section 15 of the first pipe 21, the second horizontal section 24 is made up of the second straight section 15 of the second pipe 23, and the third horizontal section 26 is made up of the second straight section 15 of the third pipe 25. Note that this disclosure is also applicable to cases where the first horizontal section 22 is made up of the first straight section 14 of the first pipe 21, the second horizontal section 24 is made up of the first straight section 14 of the second pipe 23, and the third horizontal section 26 is made up of the first straight section 14 of the third pipe 25. Furthermore, this disclosure is also applicable to cases where the multiple pipes 2 are other than branch pipes 13.

(First embodiment)
As shown in Figures 2 to 5, the vibration suppression device 1 in some embodiments comprises a first arm 31, a second arm 32 having a first gap 41 formed between it and the first arm 31, and a viscoelastic body 51 provided in the first gap 41 so as to abut against each of the first arm 31 and the second arm 32.

(first arm)
The first arm portion 31 is fixed to the first horizontal portion 22 extending along the first direction, and extends from the first horizontal portion 22 toward the second horizontal portion 24 .

In the illustrated embodiment, the vibration suppression device 1 further includes a first arc portion 311 extending circumferentially around the first horizontal portion 22 and covering a portion of the outer periphery of the first horizontal portion 22, a second arc portion 312 extending circumferentially around the first horizontal portion 22 and covering a portion of the outer periphery of the first horizontal portion 22, the second arc portion 312 being positioned between the first arc portion 311 and the first horizontal portion 22, and a first fastening member 16A fastening one end of each of the first arc portion 311 and the second arc portion 312 to each other. The first arm 31 has a base end 315 connected to the first arc portion 311 or the second arc portion 312 and extends from the base end 315 in the second direction.

In the embodiment shown in Figures 2 to 5, the vibration suppression device 1 includes a first protrusion 313 that protrudes radially outward from the tip (arc end) of one end of the first arc portion 311 (in the illustrated example, the other side in the second direction) of the first horizontal portion 22, and a second protrusion 314 that protrudes radially outward from the tip (arc end) of one end of the second arc portion 312 (in the illustrated example, the other side in the second direction) of the second horizontal portion 22 and abuts against the first protrusion 313. The first fastening member 16A may include a bolt 17A and a nut 18A configured to bolt together the first protrusion 313 and the second protrusion 314.

(Second arm)
The second arm 32 is fixed to the second horizontal portion 24 and extends from the second horizontal portion 24 toward the first horizontal portion 22. The second arm 32 is configured such that a first gap 41 is formed between the second arm 32 and the first arm 31 along a third direction that is perpendicular to both the first direction and the second direction. In other words, the second arm has a portion (tip) that overlaps with the first arm 31 in the second direction, and is positioned offset from the first arm 31 in the third direction.

In the illustrated embodiment, the vibration suppression device 1 further includes a third arc portion 321 that extends circumferentially around the second horizontal portion 24 and covers a portion of the outer periphery of the second horizontal portion 24, a fourth arc portion 322 that extends circumferentially around the second horizontal portion 24 and covers a portion of the outer periphery of the second horizontal portion 24, and is positioned between the second horizontal portion 24 and the third arc portion 321, with the second horizontal portion 24 sandwiched between the fourth arc portion 322 and the third arc portion 321, and a second fastening member 16B that fastens one end of each of the third arc portion 321 and the fourth arc portion 322. The second arm portion 32 has a base end 325 connected to the third arc portion 321 or the fourth arc portion 322 and extends from the base end 325 in the second direction.

In the embodiment shown in Figures 2 to 5, the vibration suppression device 1 includes a third protrusion 323 that protrudes radially outward from the tip (arc end) of one end of the third arc portion 321 (one side in the second direction in the illustrated example) of the second horizontal portion 24, and a fourth protrusion 324 that protrudes radially outward from the tip (arc end) of one end of the fourth arc portion 322 (one side in the second direction in the illustrated example) of the second horizontal portion 24 and abuts against the third protrusion 323. The second fastening member 16B may include a bolt 17B and a nut 18B configured to bolt together the third protrusion 323 and the fourth protrusion 324.

In the illustrated embodiment, the viscoelastic body 51 provided in the first gap 41 is able to maintain its shape against gravity, and has the property of expanding and contracting significantly in the direction of an applied force and returning to its original shape when the force is removed (elastic deformation). In the embodiment shown in Figures 2 to 5, the viscoelastic body 51 is made of a rubber material. In the first gap 41, one end of the viscoelastic body 51 is fixed to the first arm portion 31 via an adhesive, and the other end is fixed to the second arm portion 32 via an adhesive.

A first gap 41 is provided between the first arm 31 and the second arm 32 along the third direction, and a viscoelastic body 51 provided in this first gap 41 abuts against each of the first arm 31 and the second arm 32. In this case, when the first pipe 21 or the second pipe 23 shifts in the second direction due to transmitted vibrations, causing the distance between the first horizontal section 22 and the second horizontal section 24 to increase or decrease, the viscoelastic body 51 provided in the first gap 41 generates shear resistance. In this way, the relative movement occurring between the first horizontal section 22 and the second horizontal section 24 is converted into shear deformation that effectively utilizes the damping capacity of the viscoelastic body 51, thereby allowing the viscoelastic body 51 to effectively damp vibrations. With the above configuration, the shear resistance generated by the viscoelastic body 51 prevents the first horizontal section 22 or the second horizontal section 24 from shifting in the second direction, thereby suppressing vibrations of the first pipe 21 or the second pipe 23.

In some embodiments, the vibration suppression device 1 described above further includes a third arm 33, a fourth arm 34 with a second gap 42 formed between it and the third arm 33, and a viscoelastic body 52 provided in the second gap 42 so as to abut against the third arm 33 and the fourth arm 34, as shown in FIG. 3 .

(Third arm)
The third arm portion 33 is fixed to the first horizontal portion 22 extending along the first direction, and extends from the first horizontal portion 22 toward the third horizontal portion 26. In the illustrated embodiment, the third arm portion 33 has a base end 316 connected to the first arc portion 311 or the second arc portion 312, and extends from the base end 316 along the second direction.

In the embodiment shown in FIG. 3, the first arm 31 is connected to the first arc portion 311 and the third arm 33 is connected to the second arc portion 312, but both the first arm 31 and the third arm 33 may be connected to the first arc portion 311 or the second arc portion 312.

In the embodiment shown in FIG. 3, the vibration suppression device 1 includes a third fastening member 16C that fastens the other end of each of the first arc portion 311 and the second arc portion 312 opposite the one end (one side in the second direction in the illustrated example), a fifth protrusion 317 that protrudes radially outward from the other tip (arc end) of the first arc portion 311 of the first horizontal portion 22, and a sixth protrusion 318 that protrudes radially outward from the other tip (arc end) of the second arc portion 312 of the first horizontal portion 22 and abuts against the fifth protrusion 317. The third fastening member 16C may include a bolt 17C and a nut 18C configured to bolt together the fifth protrusion 317 and the sixth protrusion 318.

In the embodiment shown in FIG. 3, the vibration suppression device 1 includes a fourth fastening member 16D that fastens the other end of each of the third arc portion 321 and the fourth arc portion 322, which is opposite the one end (the other side in the second direction in the illustrated example), a seventh protrusion 326 that protrudes radially outward from the other tip (arc end) of the third arc portion 321 of the second horizontal portion 24, and an eighth protrusion 327 that protrudes radially outward from the other tip (arc end) of the fourth arc portion 322 of the second horizontal portion 24 and abuts against the seventh protrusion 326. The fourth fastening member 16D may include a bolt 17D and a nut 18D configured to bolt together the seventh protrusion 326 and the eighth protrusion 327.

(4th arm)
The fourth arm 34 is fixed to the third horizontal portion 26 extending along the first direction, and extends from the third horizontal portion 26 toward the first horizontal portion 22. The fourth arm 34 is configured such that a second gap 42 along the third direction is formed between the fourth arm 34 and the third arm 33. In other words, the fourth arm 34 has a portion (tip) that overlaps with the third arm 33 in the second direction, and is positioned offset from the third arm 33 in the third direction.

In the illustrated embodiment, the vibration suppression device 1 further includes a fifth arc portion 341 that extends circumferentially around the third horizontal portion 26 and covers a portion of the outer periphery of the third horizontal portion 26, a sixth arc portion 342 that extends circumferentially around the third horizontal portion 26 and covers a portion of the outer periphery of the third horizontal portion 26, and is positioned between the fifth arc portion 341 and the sixth arc portion 342, with the third horizontal portion 26 sandwiched between the sixth arc portion 342 and the fifth arc portion 341, and a fifth fastening member 16E that fastens together the ends of one of the fifth arc portion 341 and the sixth arc portion 342 (in the illustrated example, the other side in the second direction). The fourth arm 34 has a base end 345 connected to the fifth arc portion 341 or the sixth arc portion 342 and extends from the base end 345 in the second direction.

In the embodiment shown in FIG. 3, the vibration suppression device 1 includes a ninth protrusion 343 that protrudes radially outward from one tip (arc end) of the fifth arc portion 341, and a tenth protrusion 344 that protrudes radially outward from one tip (arc end) of the sixth arc portion 342 and abuts against the ninth protrusion 343. The fifth fastening member 16E may include a bolt 17E and a nut 18E configured to bolt together the ninth protrusion 343 and the tenth protrusion 344.

In the embodiment shown in FIG. 3, the vibration suppression device 1 includes a sixth fastening member 16F that fastens the other end of each of the fifth arc portion 341 and the sixth arc portion 342, which is opposite the one end (one side in the second direction in the illustrated example), an eleventh protrusion 346 that protrudes radially outward from the other tip (arc end) of the fifth arc portion 341 of the third horizontal portion 26, and a twelfth protrusion 347 that protrudes radially outward from the other tip (arc end) of the sixth arc portion 342 of the third horizontal portion 26 and abuts against the eleventh protrusion 346. The sixth fastening member 16F may include a bolt 17F and a nut 18F configured to bolt together the eleventh protrusion 346 and the twelfth protrusion 347.

In the illustrated embodiment, the viscoelastic body 52 provided in the second gap 42 is able to maintain its shape against gravity, and has the property of expanding and contracting significantly in the direction of an applied force and returning to its original shape when the force is removed (elastic deformation). In the embodiment shown in Figure 3, the viscoelastic body 52 is made of a rubber material. In the second gap 42, one end of the viscoelastic body 52 is fixed to the third arm portion 33 via an adhesive, and the other end is fixed to the fourth arm portion 34 via an adhesive.

A second gap 42 is provided between the third arm 33 and the fourth arm 34 along the third direction, and a viscoelastic body 52 provided in this second gap 42 abuts against each of the third arm 33 and the fourth arm 34. In this case, when the first pipe 21 or the third pipe 25 shifts in the second direction due to transmitted vibrations and the distance between the first horizontal portion 22 and the third horizontal portion 26 increases or decreases, the viscoelastic body 52 provided in the second gap 42 generates shear resistance. The shear resistance generated by the viscoelastic bodies 51, 52 provided in the first gap 41 and the second gap 42 prevents the first horizontal portion 22, the second horizontal portion 24, and the third horizontal portion 26 from shifting in the second direction, thereby effectively suppressing vibrations of the first pipe 21, the second pipe 23, and the third pipe 25.

As shown in Figure 3, the vibration suppression device 1 has a pair of arms extending from each horizontal portion of adjacent pipes 2 toward the adjacent pipes 2, and a viscoelastic body provided in the gap between the pair of arms so as to abut against each of the pair of arms. By adding these in accordance with the number of pipes 2, it is possible to fix three or more pipes 2 to each other and suppress vibration of these pipes 2.

In some embodiments, as shown in FIG. 3, the first arm 31 described above comprises either the fifth protrusion 317 or the sixth protrusion 318 (the fifth protrusion 317 in the illustrated example). The second arm 32 described above comprises either the seventh protrusion 326 or the eighth protrusion 327 (the seventh protrusion 326 in the illustrated example). The third arm 33 described above comprises either the first protrusion 313 or the second protrusion 314 (the second protrusion 314 in the illustrated example). The fourth arm 34 described above comprises either the eleventh protrusion 346 or the twelfth protrusion 347 (the eleventh protrusion 346 in the illustrated example). In these cases, the arms 31 to 34 of the vibration suppression device 1 also serve as protrusions, thereby preventing the structure of the vibration suppression device 1 from becoming too complex.

In some embodiments, the vibration suppression device 1 described above includes a fifth arm 35 that forms a third gap 43 with the second arm 32, and a viscoelastic body 53 that is provided in the third gap 43 so as to abut against both the second arm 32 and the fifth arm 35, as shown in Figures 4 and 5.

(5th arm)
The fifth arm 35 is fixed to the first horizontal portion 22 and extends from the first horizontal portion 22 toward the second horizontal portion 24. The fifth arm 35 is configured such that a third gap 43 is formed between the fifth arm 35 and the second arm 32, the third gap 43 being along the third direction and being formed on the opposite side of the second arm 32 from the first gap 41 in the third direction. The fifth arm 35 has a portion (tip) that overlaps with the second arm 32 in the second direction.

In the illustrated embodiment, the fifth arm 35 has its base end 351 connected to the first arc portion 311 or the second arc portion 312, and extends from the base end 351 along the second direction. In the embodiment shown in Figures 4 and 5, the first arm 31 is connected to the first arc portion 311, and the fifth arm 35 is connected to the second arc portion 312, but both the first arm 31 and the fifth arm 35 may be connected to the first arc portion 311 or the second arc portion 312.

In the illustrated embodiment, the viscoelastic body 53 provided in the third gap 43 is able to maintain its shape against gravity, and has the property of expanding and contracting significantly in the direction of an applied force and returning to its original shape when the force is removed (elastic deformation). In the embodiment shown in Figures 4 and 5, the viscoelastic body 53 is made of a rubber material. In the third gap 43, one end of the viscoelastic body 53 is fixed to the second arm portion 32 via an adhesive, and the other end is fixed to the fifth arm portion 35 via an adhesive.

A third gap 43 is provided between the second arm 32 and the fifth arm 35 along the third direction, and the viscoelastic body 53 provided in this third gap 43 abuts against each of the second arm 32 and the fifth arm 35. In this case, when the first pipe 21 or the second pipe 23 shifts in the second direction due to transmitted vibration and the distance between the first horizontal section 22 and the second horizontal section 24 increases or decreases, each of the viscoelastic bodies 51, 53 provided in the first gap 41 and the third gap 43 generates shear resistance. With this configuration, the total shear resistance generated by the viscoelastic bodies 51, 53 can be increased compared to when the viscoelastic body 51 is provided only in the first gap 41. This effectively prevents the first horizontal section 22 or the second horizontal section 24 from shifting in the second direction, thereby effectively suppressing vibration of the first pipe 21 or the second pipe 23.

In some embodiments, the vibration suppression device 1 described above includes a sixth arm 36 that forms a fourth gap 44 with the first arm 31, and a viscoelastic body 54 that is provided in the fourth gap 44 so as to abut against both the first arm 31 and the sixth arm 36, as shown in FIG. 5 .

(6th arm)
The sixth arm 36 is fixed to the second horizontal portion 24 and extends from the second horizontal portion 24 toward the first horizontal portion 22. The sixth arm 36 is configured such that a fourth gap 44 is formed between the sixth arm 36 and the first arm 31, the fourth gap 44 being aligned along the third direction and being formed on the opposite side of the first arm 31 from the first gap 41 in the third direction. The sixth arm 36 has a portion (tip) that overlaps with the first arm 31 in the second direction.

In the illustrated embodiment, the sixth arm 36 has its base end 361 connected to the third arc portion 321 or the fourth arc portion 322 and extends from the base end 361 in the second direction. In the embodiment shown in FIG. 5, the second arm 32 is connected to the third arc portion 321 and the sixth arm 36 is connected to the fourth arc portion 322, but both the second arm 32 and the sixth arm 36 may be connected to the third arc portion 321 or the fourth arc portion 322.

In the illustrated embodiment, the viscoelastic body 54 provided in the fourth gap 44 is able to maintain its shape against gravity, and has the property of expanding and contracting significantly in the direction of an applied force and returning to its original shape when the force is removed (elastic deformation). In the embodiment shown in FIG. 5, the viscoelastic body 54 is made of a rubber material. In the fourth gap 44, one end of the viscoelastic body 54 is fixed to the sixth arm portion 36 via an adhesive, and the other end is fixed to the first arm portion 31 via an adhesive.

A fourth gap 44 is provided between the first arm 31 and the sixth arm 36 along the third direction, and the viscoelastic body 54 provided in this fourth gap 44 abuts against each of the first arm 31 and the sixth arm 36. In this case, when the first pipe 21 or the second pipe 23 shifts in the second direction due to transmitted vibration and the distance between the first horizontal section 22 and the second horizontal section 24 increases or decreases, each of the viscoelastic bodies 51, 54 provided in the first gap 41 and the fourth gap 44 generates shear resistance. This configuration increases the total shear resistance generated by the viscoelastic bodies 51, 54 compared to when the viscoelastic body 51 is provided only in the first gap 41. This effectively suppresses shifting of the first horizontal section 22 or the second horizontal section 24 in the second direction and effectively suppresses vibration of the first pipe 21 or the second pipe 23. This embodiment can also be applied to a vibration suppression device 1 that does not have a viscoelastic body 53 provided in the third gap 43.

In some embodiments, as shown in Figures 2 to 5, each of the above-mentioned viscoelastic bodies 51, 52, 53, and 54 is made of a rubber material. Note that viscoelastic body 51 is constructed separately from each of viscoelastic bodies 52, 53, and 54.

With the above configuration, each of the viscoelastic bodies 51, 52, 53, and 54 is made of a rubber material, so it deforms in response to externally applied vibrations and returns to its original shape when the external vibrations cease. Therefore, each of the viscoelastic bodies 51, 52, 53, and 54, made of a rubber material, can instantly exert shear resistance to externally applied vibrations. Furthermore, even if each of the viscoelastic bodies 51, 52, 53, and 54 deforms due to externally applied vibrations, the viscoelasticity can be maintained in the gaps (such as the first gap 41) in which the viscoelastic body is provided, allowing the viscoelastic body to repeatedly exert shear resistance to externally applied vibrations. This effectively suppresses vibrations in the multiple pipes 2.

Second Embodiment
As shown in Figures 6 and 7, the vibration suppression device 1 in some embodiments comprises the above-mentioned first arm portion 31, the above-mentioned second arm portion 32 in which a first gap 41 is formed between the first arm portion 31 and the second arm portion 32, a viscoelastic body 61 made of a viscous material having fluidity, and a casing 7 in which the first gap 41 is provided and which is filled with the viscoelastic body 61.

In the embodiment shown in Figures 6 and 7, the casing 7 is formed with a first insertion hole 71 for inserting the tip of the first arm 31 (the end opposite the base end 315) into the interior of the casing 7, and a second insertion hole 72 for inserting the tip of the second arm 32 (the end opposite the base end 325) into the interior of the casing 7. By inserting the tips of the first arm 31 and the second arm 32 into the interior of the casing 7, a first gap 41 is formed inside the casing 7. The interior of the casing 7 is filled with a viscoelastic body 61 made of a viscous material with fluidity, and a portion of this viscoelastic body 61 constitutes the viscoelastic body 51 described above. The viscoelastic body 51 is made of a viscous material with fluidity.

In the embodiment shown in FIG. 7 , the casing 7 further includes a third insertion hole 73 for inserting the tip of the fifth arm 35 (the end opposite the base end 351) into the casing 7, and a fourth insertion hole 74 for inserting the tip of the sixth arm 36 (the end opposite the base end 361) into the casing 7. By inserting the tips of the fifth arm 35 and the sixth arm 36 into the casing 7, a third gap 43 and a fourth gap 44 are formed inside the casing 7. Portions of the viscoelastic body 61 filled inside the casing 7 constitute the viscoelastic bodies 51, 53, and 54, respectively. Each of the viscoelastic bodies 53 and 54 is made of a viscous material having fluidity. The viscoelastic body 51 is integral with each of the viscoelastic bodies 53 and 54. Note that the viscoelastic body 52 described above may also be made of a viscous material having fluidity, similar to the viscoelastic body 51.

In the embodiment shown in Figures 6 and 7, the casing 7 includes a first side portion 75, a second side portion 76, a third side portion 77, and a fourth side portion 78 in a cross section perpendicular to the first direction.

The first side portion 75 extends along the second direction on the opposite side of the first arm portion 31 in the third direction, sandwiching the second arm portion 32 therebetween. The second side portion 76 extends along the second direction on the opposite side of the second arm portion 32 in the third direction, sandwiching the first arm portion 31 therebetween. The third side portion 77 extends along the third direction on one side of the tip of the second arm portion 32 in the second direction (the other side in the second direction), with one end connected to the first side portion 75 and the other end connected to the second side portion 76. The first insertion hole 71 and the third insertion hole 73 are formed in the third side portion 77. The fourth side portion 78 extends along the third direction on the other side of the tip of the first arm portion 31 in the second direction (the one side in the second direction), with one end connected to the first side portion 75 and the other end connected to the second side portion 76.

In the embodiment shown in FIG. 6 , a gap 70A is provided between the first side portion 75 and the second arm portion 32 along the third direction. A gap 70B is provided between the second side portion 76 and the first arm portion 31 along the third direction. A portion of a viscoelastic body 61 is filled in each of the gaps 70A and 70B. The viscoelastic body 61 filled in each of the first gap 41 and the gaps 70A and 70B is made of a viscous material with fluidity, and therefore deforms in response to vibrations applied from outside the viscoelastic body 61, thereby instantly providing shear resistance. When the first pipe 21 or the second pipe 23 shifts in the second direction due to transmitted vibrations and the distance between the first horizontal portion 22 and the second horizontal portion 24 increases or decreases, the viscoelastic body 61 filled in each of the first gap 41 and the gaps 70A and 70B generates shear resistance.

In the embodiment shown in FIG. 7 , a gap 70C is provided between the first side portion 75 and the fifth arm portion 35 along the third direction. A gap 70D is provided between the second side portion 76 and the sixth arm portion 36 along the third direction. A portion of a viscoelastic body 61 is filled in each of the gaps 70C and 70D. The viscoelastic body 61 filling the first gap 41, the third gap 43, the fourth gap 44, and the gaps 70C and 70D is made of a viscous material with fluidity. Therefore, it deforms in response to vibrations applied from outside the viscoelastic body 61 and can instantly provide shear resistance. When the first pipe 21 or the second pipe 23 shifts in the second direction due to transmitted vibrations and the distance between the first horizontal portion 22 and the second horizontal portion 24 increases or decreases, the viscoelastic body 61 filling the first gap 41, the third gap 43, the fourth gap 44, and the gaps 70C and 70D generates shear resistance.

With the above configuration, the viscoelastic body 61 filled in the first gap 41 and the gap between the casing 7 and the arm portion (such as the first arm portion 31) is made of a fluid, viscous material, and therefore deforms in response to vibrations applied from outside the viscoelastic body 61. Therefore, the viscoelastic body 61 can instantly exert shear resistance to vibrations applied from outside the viscoelastic body 61. When the first pipe 21 or the second pipe 23 shifts in the second direction due to the transmitted vibrations, causing the distance between the first horizontal portion 22 and the second horizontal portion 24 to increase or decrease, the shear resistance generated by the viscoelastic body 61 can prevent the first horizontal portion 22 or the second horizontal portion 24 from shifting in the second direction, thereby suppressing vibrations of the first pipe 21 or the second pipe 23. This effectively suppresses vibrations of the multiple pipes 2.

(Third embodiment)
As shown in Figures 8 and 9, the vibration suppression device 1 in some embodiments comprises a first fixed portion 320, a first arm portion 31A forming a first gap 41A between it and the first fixed portion 320, and a viscoelastic body 51A provided in the first gap 41A so as to abut against each of the first arm portion 31A and the first fixed portion 320.

(First fixed part)
The first fixing portion 320 covers the outer periphery of the second horizontal portion 24 and is fixed to the second horizontal portion 24. In the illustrated embodiment, the first fixing portion 320 includes the above-described third arc portion 321, the above-described fourth arc portion 322, and the above-described second fastening member 16B.

(first arm)
The first arm 31A is fixed to the first horizontal portion 22 extending along the first direction, and extends from the first horizontal portion 22 toward the second horizontal portion 24. In the illustrated embodiment, the vibration suppression device 1 further includes the above-described first arc portion 311, the above-described second arc portion 312, and the above-described fastening member 16A. The first arm 31A has a base end 315A connected to the first arc portion 311 or the second arc portion 312, and extends from the base end 315A along the second direction.

The first arm portion 31A is configured so that a first gap 41A along the third direction is formed between the first arm portion 31A and the first fixed portion 320. In other words, the first arm portion 31A has a portion (tip) that overlaps with the first fixed portion 320 in the second direction, and is positioned offset from the first fixed portion 320 in the third direction. In the illustrated embodiment, the base end 315A of the first arm portion 31A is connected to the first arc portion 311, and the tip, which is the end opposite the base end 315A, forms the first gap 41A with the outer peripheral surface of the fourth arc portion 322.

In the illustrated embodiment, the viscoelastic body 51A provided in the first gap 41A is able to maintain its shape against gravity, and has the property of expanding and contracting significantly in the direction of an applied force and returning to its original shape when the force is removed (elastic deformation). In the embodiment shown in Figures 8 and 9, the viscoelastic body 51A is made of a rubber material. In the first gap 41A, one end of the viscoelastic body 51A is fixed to the first arm portion 31A via an adhesive, and the other end is fixed to the outer peripheral surface of the fourth arc portion 322 via an adhesive.

A first gap 41A is provided between the first arm 31A and the first fixed portion 320 along the third direction, and the viscoelastic body 51A provided in this first gap 41A abuts against both the first arm 31A and the first fixed portion 320. In this case, when the first pipe 21 or the second pipe 23 shifts in the second direction due to transmitted vibrations, causing the distance between the first horizontal portion 22 and the second horizontal portion 24 to increase or decrease, the viscoelastic body 51A provided in the first gap 41A generates shear resistance. In this way, the relative movement between the first horizontal portion 22 and the second horizontal portion 24 is converted into shear deformation that effectively utilizes the damping capacity of the viscoelastic body 51A, allowing the viscoelastic body 51A to effectively damp vibrations. With the above configuration, the shear resistance generated by the viscoelastic body 51A prevents the first horizontal section 22 and the second horizontal section 24 from shifting in the second direction, thereby suppressing vibration of the first pipe 21 and the second pipe 23.

As shown in FIG. 9, a vibration suppression device 1 according to some embodiments includes a second fixed portion 340, a second arm portion 32A that forms a second gap 42A between itself and the second fixed portion 340, and a viscoelastic body 52A that is provided in the second gap 42A so as to abut against both the second arm portion 32A and the second fixed portion 340.

(Second fixed part)
The second fixing portion 340 covers the outer periphery of the third horizontal portion 26 and is fixed to the third horizontal portion 26. In the illustrated embodiment, the second fixing portion 340 includes the fifth arc portion 341 described above, the sixth arc portion 342 described above, and the fifth fastening member 16E described above.

(Second arm)
The second arm 32A is fixed to the first horizontal portion 22 extending along the first direction, and extends from the first horizontal portion 22 toward the third horizontal portion 26. In the illustrated embodiment, the second arm 32A has a base end 328 connected to the first arc portion 311 or the second arc portion 312, and extends from the base end 328 along the second direction.

The second arm portion 32A is configured so that a second gap 42A along the third direction is formed between the second arm portion 32A and the second fixed portion 340. In other words, the second arm portion 32A has a portion (tip) that overlaps with the second fixed portion 340 in the second direction, and is positioned offset from the second fixed portion 340 in the third direction. In the illustrated embodiment, the base end 328 of the second arm portion 32A is connected to the second arc portion 312, and the tip, which is the end opposite the base end 328, forms the second gap 42A with the outer peripheral surface of the fifth arc portion 341.

In the illustrated embodiment, the viscoelastic body 52A provided in the second gap 42A is able to maintain its shape against gravity, and has the property of expanding and contracting significantly in the direction of an applied force and returning to its original shape when the force is removed (elastic deformation). In the embodiment shown in Figure 9, the viscoelastic body 52A is made of a rubber material. In the second gap 42A, one end of the viscoelastic body 52A is fixed to the second arm portion 32A via an adhesive, and the other end is fixed to the outer peripheral surface of the fifth arc portion 341 via an adhesive.

A second gap 42A is provided between the second arm 32A and the second fixed portion 340 along the third direction, and a viscoelastic body 52A provided in this second gap 42A abuts against the second arm 32A and the second fixed portion 340, respectively. When the first pipe 21 or the third pipe 25 shifts in the second direction due to transmitted vibrations and the distance between the first horizontal portion 22 and the third horizontal portion 26 increases or decreases, the viscoelastic body 52A provided in the second gap 42A generates shear resistance. With this configuration, the shear resistance generated by the viscoelastic bodies 51A, 52A provided in the first gap 41A and the second gap 42A suppresses the first horizontal portion 22, the second horizontal portion 24, and the third horizontal portion 26 from shifting in the second direction, thereby effectively suppressing vibrations of the first pipe 21, the second pipe 23, and the third pipe 25.

In some embodiments, as shown in Figures 8 and 9, the viscoelastic bodies 51A and 52A are each made of a rubber material. The viscoelastic body 51A is constructed separately from the viscoelastic body 52A.

With the above configuration, each of the viscoelastic bodies 51A, 52A is made of a rubber material, so it deforms in response to externally applied vibrations and returns to its original shape when the external vibrations cease. Therefore, each of the viscoelastic bodies 51A, 52A made of a rubber material can instantly exert shear resistance to externally applied vibrations. Furthermore, even if each of the viscoelastic bodies 51A, 52A deforms due to externally applied vibrations, the viscoelastic body can be maintained in the gap where the viscoelasticity is provided (such as the first gap 41A), so the viscoelastic body can repeatedly exert shear resistance to externally applied vibrations. This effectively suppresses vibrations in the multiple pipes 2.

(Fourth embodiment)
As shown in Figure 10, the vibration suppression device 1 according to some embodiments comprises the above-mentioned first fixed portion 320, the above-mentioned first arm portion 31A in which a first gap 41A is formed between the first fixed portion 320 and the first arm portion 31A, a viscoelastic body 61A made of a fluid viscous material, and a casing 8 in which the first gap 41A is provided and which is filled with the viscoelastic body 61A.

In the embodiment shown in FIG. 10, the casing 8 is attached to the outer periphery of the first fixing portion 320 (in the illustrated example, the fourth arc portion 322), thereby forming an internal space 80 filled with the viscoelastic body 51A (61A). The casing 8 is formed with an insertion hole 81 for inserting the tip of the first arm portion 31A (the end opposite the base end 315A) into the casing 8. By inserting the tip of the first arm portion 31A into the casing 8, a first gap 41A is formed inside the casing 8. The inside of the casing 8 is filled with a viscoelastic body 61A made of a viscous material with fluidity, and a portion of this viscoelastic body 61A constitutes the viscoelastic body 51A described above. The viscoelastic body 51A is made of a viscous material with fluidity.

In the embodiment shown in FIG. 10, the casing 8 includes a first side portion 82, a second side portion 83, and a third side portion 84 in a cross section perpendicular to the first direction.

The first side portion 82 extends along the second direction on the opposite side from the fourth arc portion 322, across the tip of the first arm portion 31A in the third direction. The second side portion 83 extends along the third direction on one side of the tip of the first arm portion 31A in the second direction (the one side in the second direction), with one end connected to the first side portion 82 and the other end connected to the fourth arc portion 322. The third side portion 84 extends along the third direction on the other side of the tip of the first arm portion 31A in the second direction (the other side in the second direction), with one end connected to the first side portion 82 and the other end connected to the fourth arc portion 322. The insertion hole 81 is formed in the third side portion 84.

In the embodiment shown in FIG. 10 , a gap 80A is provided between the first side portion 82 and the first arm portion 31A along the third direction. The internal space 80 includes the gap 80A, and a portion of the viscoelastic body 61A is also filled in the gap 80A. The viscoelastic body 61A filled in the first gap 41A and the gap 80A is made of a viscous material with fluidity, so it deforms in response to vibrations applied from outside the viscoelastic body 61A and can instantly provide shear resistance. When the first pipe 21 and the second pipe 23 shift in the second direction due to the transmitted vibrations and the distance between the first horizontal portion 22 and the second horizontal portion 24 increases or decreases, the viscoelastic body 61A filled in the first gap 41A and the gap 80A generates shear resistance.

With the above configuration, the viscoelastic body 61A filled in the first gap 41A and the gap between the casing 8 and the first arm 31 is made of a fluid, viscous material, and therefore deforms in response to vibrations applied from outside the viscoelastic body 61A. Therefore, the viscoelastic body 61A can instantly exert shear resistance to vibrations applied from outside the viscoelastic body 61A. When the first pipe 21 or the second pipe 23 shifts in the second direction due to the transmitted vibrations, causing the distance between the first horizontal section 22 and the second horizontal section 24 to increase or decrease, the shear resistance generated by the viscoelastic body 61A can prevent the first horizontal section 22 or the second horizontal section 24 from shifting in the second direction, thereby suppressing vibrations of the first pipe 21 or the second pipe 23. This effectively suppresses vibrations of the multiple pipes 2.

In some embodiments, as shown in FIG. 1, each of the above-mentioned multiple pipes 2 comprises a branch pipe 13 having one end 141 connected to a main pipe 12 extending along the second direction. According to the above configuration, each of the multiple branch pipes 13 having one end 141 connected to the main pipe 12 tends to deform along the second direction in which the main pipe 12 extends due to vibrations transmitted from the main pipe 12. Therefore, by providing a vibration suppression device 1 for the multiple branch pipes 13, vibrations of the multiple branch pipes 13 can be effectively suppressed.

In some embodiments, as shown in FIG. 1, each of the plurality of pipes 2 includes the first straight section 14 and the second straight section 15, with the first horizontal section 22 consisting of the second straight section 15 of the first pipe 21, the second horizontal section 24 consisting of the second straight section 15 of the second pipe 23, and the third horizontal section 26 consisting of the second straight section 15 of the third pipe 25.

With the above configuration, the shear resistance generated by the viscoelastic bodies 51, 51A, etc. prevents the first horizontal section 22 (second straight section 15 of the first pipe 21) and the second horizontal section 24 (second straight section 15 of the second pipe 23) from shifting in the second direction, thereby suppressing vibration of the first pipe 21 and the second pipe 23.

In order to enhance the vibration suppression effect, it is preferable that each of the first arc portion 311, the second arc portion 312, the third arc portion 321, and the fourth arc portion 322 be positioned at a position with the largest vibration amplitude. In the embodiment shown in FIG. 1, it is preferable that the first arc portion 311 and the second arc portion 312 be positioned on the one end 151 side of the second straight portion 15 of the first piping 21 (the side connected to the first straight portion 14). It is also preferable that the third arc portion 321 and the fourth arc portion 322 be positioned on the one end 151 side of the second straight portion 15 of the second piping 23 (the side connected to the first straight portion 14).

In this specification, expressions expressing relative or absolute arrangement such as "in a certain direction,""along a certain direction,""parallel,""orthogonal,""center,""concentric," or "coaxial" not only express such an arrangement strictly, but also express a state in which there is a relative displacement with a tolerance or an angle or distance to the extent that the same function is obtained.
For example, expressions such as "identical,""equal," and "homogeneous" that indicate that something is in an equal state not only indicate a state of strict equality, but also indicate a state in which there is a tolerance or a difference to the extent that the same function is obtained.
Furthermore, in this specification, expressions representing shapes such as a rectangular shape or a cylindrical shape not only represent rectangular shapes or cylindrical shapes in the strict geometric sense, but also represent shapes including uneven portions, chamfered portions, etc., to the extent that the same effect can be obtained.
Furthermore, in this specification, the expressions "comprise,""include," or "have" a component are not exclusive expressions that exclude the presence of other components.

The present disclosure is not limited to the above-described embodiments, but also includes modifications to the above-described embodiments and appropriate combinations of these embodiments.

The contents described in the above-mentioned embodiments can be understood, for example, as follows:

1) A vibration suppression device (1) according to at least one embodiment of the present disclosure includes:
A vibration suppression device (1) for suppressing vibration of a plurality of pipes (2),
The plurality of pipes (2) include a first pipe (21) having a first horizontal portion (22) extending along a first direction, and a second pipe (23) having a second horizontal portion (24) extending along the first direction and spaced apart from the first horizontal portion (22) on one side of a second direction perpendicular to the first direction,
The vibration suppression device (1) comprises:
a first arm portion (31) fixed to the first horizontal portion (22) and extending from the first horizontal portion (22) toward the second horizontal portion (24);
a second arm portion (32) fixed to the second horizontal portion (24) and extending from the second horizontal portion (24) toward the first horizontal portion (22), the second arm portion (32) being configured such that a first gap (41) is formed between the second arm portion (32) and the first arm portion (31) along a third direction perpendicular to each of the first direction and the second direction;
and a viscoelastic body (51) provided in the first gap (41) so as to abut against the first arm portion (31) and the second arm portion (32).

According to the configuration of 1) above, a first gap (41) is provided between the first arm portion (31) and the second arm portion (32) along the third direction, and the viscoelastic body (51) provided in this first gap (41) abuts against each of the first arm portion (31) and the second arm portion (32). In this case, when the first pipe (21) or the second pipe (23) shifts in the second direction due to transmitted vibration and the distance between the first horizontal portion (22) and the second horizontal portion (24) increases or decreases, the viscoelastic body (51) provided in the first gap (41) generates shear resistance. According to the configuration of 1) above, the shear resistance generated by the viscoelastic body (51) can suppress the shifting of the first horizontal portion (22) or the second horizontal portion (24) in the second direction, thereby effectively suppressing vibration of the first pipe (21) or the second pipe (23).

2) In some embodiments, the vibration suppression device (1) described in 1) above,
the plurality of pipes (2) further includes a third pipe (25) having a third horizontal portion (26) extending along the first direction and spaced apart from the first horizontal portion (22) on the other side in the second direction,
The vibration suppression device (1) comprises:
a third arm portion (33) fixed to the first horizontal portion (22) and extending from the first horizontal portion (22) toward the third horizontal portion (26);
a fourth arm portion (34) fixed to the third horizontal portion (26) and extending from the third horizontal portion (26) toward the first horizontal portion (22), the fourth arm portion (34) being configured such that a second gap (42) along the third direction is formed between the fourth arm portion (34) and the third arm portion (33);
The device further includes a viscoelastic body (52) provided in the second gap (42) so as to abut against the third arm portion (33) and the fourth arm portion (34).

According to the configuration of 2) above, when the first pipe (21) or the third pipe (25) shifts in the second direction due to the transmitted vibration and the distance between the first horizontal portion (22) and the third horizontal portion (26) increases or decreases, the viscoelastic body (52) provided in the second gap (42) generates shear resistance. According to the configuration of 2) above, the shear resistance generated by the viscoelastic bodies (51, 52) provided in the first gap (41) or the second gap (42) can prevent the first horizontal portion (22), the second horizontal portion (24), and the third horizontal portion (26) from shifting in the second direction, thereby effectively suppressing vibration of the first pipe (21), the second pipe (23), and the third pipe (25).

3) In some embodiments, the vibration suppression device (1) described in 1) or 2) above,
a fifth arm portion (35) fixed to the first horizontal portion (22) and extending from the first horizontal portion (22) toward the second horizontal portion (24), wherein a third gap (43) along the third direction formed on the opposite side of the second arm portion (32) from the first gap (41) is formed between the fifth arm portion (35) and the second arm portion (32);
and a viscoelastic body (53) provided in the third gap (43) so as to abut against the second arm portion (32) and the fifth arm portion (35).

According to the configuration of 3) above, when the first pipe (21) or the second pipe (23) shifts in the second direction due to the transmitted vibration and the distance between the first horizontal portion (22) and the second horizontal portion (24) increases or decreases, the viscoelastic bodies (51, 53) provided in the first gap (41) and the third gap (43) each generate shear resistance. According to the configuration of 3) above, the total shear resistance generated by the viscoelastic bodies (51, 53) can be increased compared to when the viscoelastic body (51) is provided only in the first gap (41). This effectively prevents the first horizontal portion (22) or the second horizontal portion (24) from shifting in the second direction, thereby effectively suppressing vibration of the first pipe (21) or the second pipe (23).

4) In some embodiments, the vibration suppression device (1) according to any one of 1) to 3) above,
a sixth arm portion (36) fixed to the second horizontal portion (24) and extending from the second horizontal portion (24) toward the first horizontal portion (22), wherein a fourth gap (44) along the third direction formed on the opposite side of the first arm portion (31) from the first gap (41) is formed between the sixth arm portion (36) and the first arm portion (31);
and a viscoelastic body (54) provided in the fourth gap (44) so as to abut against the first arm portion (31) and the sixth arm portion (36).

According to the configuration of 4) above, when the first pipe (21) or the second pipe (23) shifts in the second direction due to the transmitted vibration and the distance between the first horizontal portion (22) and the second horizontal portion (24) increases or decreases, the viscoelastic bodies (51, 54) provided in the first gap (41) and the fourth gap (44) each generate shear resistance. According to the configuration of 4) above, the total shear resistance generated by the viscoelastic bodies (51, 54) can be increased compared to when the viscoelastic body (51) is provided only in the first gap (41). This effectively prevents the first horizontal portion (22) or the second horizontal portion (24) from shifting in the second direction, thereby effectively suppressing vibration of the first pipe (21) or the second pipe (23).

5) The vibration suppression device (1) according to at least one embodiment of the present disclosure includes:
A vibration suppression device (1) for suppressing vibration of a plurality of pipes (2),
The plurality of pipes (2) include a first pipe (21) having a first horizontal portion (22) extending along a first direction, and a second pipe (23) having a second horizontal portion (24) extending along the first direction and spaced apart from the first horizontal portion (22) on one side of a second direction perpendicular to the first direction,
The vibration suppression device (1) comprises:
a first fixing portion (320) that covers the outer periphery of the second horizontal portion (24) and is fixed to the second horizontal portion (24);
a first arm portion (31A) fixed to the first horizontal portion (22) and extending from the first horizontal portion (22) toward the second horizontal portion (24), the first arm portion (31A) being configured such that a first gap (41A) is formed between the first arm portion (31A) and the first fixed portion (320) along a third direction perpendicular to each of the first direction and the second direction;
and a viscoelastic body (51A) provided in the first gap (41A) so as to abut against the first arm portion (31A) and the first fixing portion (320).

According to the configuration of 5) above, a first gap (41A) is provided between the first arm portion (31A) and the first fixed portion (320) along the third direction, and the viscoelastic body (51A) provided in this first gap (41A) abuts against both the first arm portion (31A) and the first fixed portion (320). In this case, when the first pipe (21) or the second pipe (23) shifts in the second direction due to the transmitted vibration and the distance between the first horizontal portion (22) and the second horizontal portion (24) increases or decreases, the viscoelastic body (51A) provided in the first gap (41A) generates shear resistance. According to the configuration of 5) above, the shear resistance generated by the viscoelastic body (51A) can prevent the first horizontal portion (22) or the second horizontal portion (24) from shifting in the second direction, thereby effectively suppressing vibration of the first pipe (21) or the second pipe (23).

6) In some embodiments, the vibration suppression device (1) described in 5) above,
the plurality of pipes (2) further includes a third pipe (25) having a third horizontal portion (26) extending along the first direction and spaced apart from the first horizontal portion (22) on the other side in the second direction,
The vibration suppression device (1) comprises:
a second fixing portion (340) that covers the outer periphery of the third horizontal portion (26) and is fixed to the third horizontal portion (26);
a second arm portion (32A) fixed to the first horizontal portion (22) and extending from the first horizontal portion (22) toward the third horizontal portion (26), the second arm portion (32A) being configured such that a second gap (42A) along the third direction is formed between the second arm portion (32A) and the second fixed portion (340);
The device further includes a viscoelastic body (52A) provided in the second gap (42A) so as to abut against the second arm portion (32A) and the second fixing portion (340).

According to the configuration of 6) above, when the first pipe (21) or the third pipe (25) shifts in the second direction due to the transmitted vibration and the distance between the first horizontal portion (22) and the third horizontal portion (26) increases or decreases, the viscoelastic body (52A) provided in the second gap (42A) generates shear resistance. According to the configuration of 6) above, the shear resistance generated by the viscoelastic bodies (51A, 52A) provided in the first gap (41A) or the second gap (42A) can prevent the first horizontal portion (22), the second horizontal portion (24), and the third horizontal portion (26) from shifting in the second direction, thereby effectively suppressing vibration of the first pipe (21), the second pipe (23), and the third pipe (25).

7) In some embodiments, the vibration suppression device (1) according to any one of 1) to 6) above,
The viscoelastic body (51, 51A) provided in the first gap (41, 41A) is made of a rubber material.

According to the configuration of 7) above, the viscoelastic body (51, 51A) provided in the first gap (41, 41A) is made of a rubber material, so it deforms in response to vibrations applied from outside the viscoelastic body (51, 51A) and returns to its original shape when the external vibrations cease. Therefore, the viscoelastic body (51, 51A) made of a rubber material can instantly exert shear resistance to vibrations applied from outside the viscoelastic body (51, 51A). Furthermore, even if the viscoelastic body (51, 51A) deforms due to external vibrations, the viscoelastic body (51, 51A) can be maintained in the first gap, so it can repeatedly exert shear resistance to vibrations applied from outside the viscoelastic body (51, 51A). This effectively suppresses vibrations in the multiple pipes (2).

8) In some embodiments, the vibration suppression device (1) according to any one of 1) to 6) above,
the viscoelastic body (51, 51A) provided in the first gap (41, 41A) is made of a viscous material having fluidity,
The vibration suppression device (1) further includes a casing (7, 8) in which the first gap (41, 41A) is provided and in which the viscoelastic body (51 (61), 51A (61A)) is filled.

According to the configuration of 8) above, the viscoelastic body (61, 61A) filled in the first gap (41, 41A) or the gap between the casing (7, 8) and the arm (first arm 31, etc.) is made of a viscous material with fluidity, and therefore deforms in response to vibrations applied from outside the viscoelastic body (61, 61A). Therefore, the viscoelastic body (61, 61A) can instantly exert shear resistance to vibrations applied from outside the viscoelastic body (61, 61A). This effectively suppresses vibrations of the multiple pipes (2).

9) In some embodiments, the vibration suppression device (1) according to any one of 1) to 8) above,
Each of the plurality of pipes (2) comprises a branch pipe (13) having one end (141) connected to a main pipe (12) extending along the second direction.

According to the configuration of 9) above, each of the multiple branch pipes (13) whose one end (141) is connected to the main pipe (12) tends to deform along the second direction in which the main pipe (12) extends due to vibrations transmitted from the main pipe (12). Therefore, by providing a vibration suppression device (1) for the multiple branch pipes (13), vibrations of the multiple branch pipes (13) can be effectively suppressed.

10) In some embodiments, the vibration suppression device (1) described in 9) above,
Each of the plurality of pipes (2) includes a first straight portion (14) extending from the one end (141) connected to the main pipe (12) along a direction intersecting each of the first direction and the second direction, and a second straight portion (15) extending from the other end (142) of the first straight portion (14) along the first direction,
The first horizontal section (22) is made up of the second straight section (15) of the first pipe (21),
The second horizontal section (24) is formed from the second straight section (15) of the second pipe (23).

According to the configuration of 10) above, the shear resistance generated by the viscoelastic body (51, 51A) can prevent the first horizontal section (22, second straight section 15 of the first pipe 21) and the second horizontal section (24, second straight section 15 of the second pipe 23) from shifting in the second direction, thereby effectively suppressing vibration of the first pipe (21) and the second pipe (23).

1 Vibration suppression device 2 Pipes 7, 8 Casing 10 Engine 11 Cylinder 12 Main pipe 13 Branch pipe 14 First straight section 15 Second straight section 16A to 16F Fastening member 17A to 17F Bolt 18A to 18F Nut 21 First pipe 22 First horizontal section 23 Second pipe 24 Second horizontal section 25 Third pipe 26 Third horizontal section 31, 31A First arm section 32, 32A Second arm section 33 Third arm section 34 Fourth arm section 35 Fifth arm section 36 Sixth arm section 41, 41A First gap 42, 42A Second gap 43 Third gap 44 Fourth gap 51, 51A, 52, 52A, 53, 54, 61, 61A Viscoelastic body 311 First arc section 312 Second arc section 313 First protrusion 314 Second protrusion 315, 316 Base end 317 Fifth protrusion 318 Sixth protrusion 321 Third arc portion 322 Fourth arc portion 323 Third protrusion 324 Fourth protrusion 325 Base end 326 Seventh protrusion 327 Eighth protrusion 341 Fifth arc portion 342 Sixth arc portion 343 Ninth protrusion 344 Tenth protrusion 345 Base end 346 Eleventh protrusion 347 Twelfth protrusion

Claims (12)

A vibration suppression device for suppressing vibration of a plurality of pipes,
the plurality of pipes include a first pipe having a first horizontal portion extending along a first direction, and a second pipe having a second horizontal portion extending along the first direction and spaced apart from the first horizontal portion on one side of a second direction perpendicular to the first direction,
The vibration suppression device is
a first arm portion fixed to the first horizontal portion and extending from the first horizontal portion toward the second horizontal portion;
a second arm portion fixed to the second horizontal portion and extending from the second horizontal portion toward the first horizontal portion, the second arm portion being configured such that a first gap is formed between the second arm portion and the first arm portion along a third direction perpendicular to each of the first direction and the second direction;
a viscoelastic body provided in the first gap so as to contact the first arm portion and the second arm portion ,
Each of the plurality of pipes is a branch pipe connected at one end to a main pipe extending along the second direction . the plurality of pipes further include a third pipe having a third horizontal portion extending along the first direction and spaced apart from the first horizontal portion on the other side in the second direction,
The vibration suppression device is
a third arm portion fixed to the first horizontal portion and extending from the first horizontal portion toward the third horizontal portion;
a fourth arm portion fixed to the third horizontal portion and extending from the third horizontal portion toward the first horizontal portion, the fourth arm portion being configured such that a second gap along the third direction is formed between the fourth arm portion and the third arm portion;
The vibration suppressing device according to claim 1 , further comprising a viscoelastic body provided in the second gap so as to abut against the third arm portion and the fourth arm portion. a fifth arm portion fixed to the first horizontal portion and extending from the first horizontal portion toward the second horizontal portion, the fifth arm portion being configured such that a third gap is formed between the fifth arm portion and the second arm portion along the third direction on the opposite side of the second arm portion from the first gap;
The vibration suppressing device according to claim 1 or 2, further comprising: a viscoelastic body provided in the third gap so as to abut against each of the second arm portion and the fifth arm portion. a sixth arm portion fixed to the second horizontal portion and extending from the second horizontal portion toward the first horizontal portion, the sixth arm portion being configured such that a fourth gap is formed between the sixth arm portion and the first arm portion along the third direction on the opposite side of the first arm portion from the first gap;
The vibration suppressing device according to claim 1 , further comprising: a viscoelastic body provided in the fourth gap so as to abut against each of the first arm portion and the sixth arm portion. A vibration suppression device for suppressing vibration of a plurality of pipes,
the plurality of pipes include a first pipe having a first horizontal portion extending along a first direction, and a second pipe having a second horizontal portion extending along the first direction and spaced apart from the first horizontal portion on one side of a second direction perpendicular to the first direction,
The vibration suppression device is
a first fixing portion that covers an outer periphery of the second horizontal portion and is fixed to the second horizontal portion;
a first arm portion fixed to the first horizontal portion and extending from the first horizontal portion toward the second horizontal portion, the first arm portion being configured to form a first gap between the first arm portion and the first fixed portion along a third direction perpendicular to each of the first direction and the second direction;
a viscoelastic body provided in the first gap so as to abut against the first arm portion and the first fixed portion, respectively. the plurality of pipes further include a third pipe having a third horizontal portion extending along the first direction and spaced apart from the first horizontal portion on the other side in the second direction,
The vibration suppression device is
a second fixing portion that covers an outer periphery of the third horizontal portion and is fixed to the third horizontal portion;
a second arm portion fixed to the first horizontal portion and extending from the first horizontal portion toward the third horizontal portion, the second arm portion being configured such that a second gap along the third direction is formed between the second arm portion and the second fixed portion;
The vibration suppressing device according to claim 5 , further comprising a viscoelastic body provided in the second gap so as to abut against the second arm portion and the second fixed portion. Each of the viscoelastic bodies is made of a rubber material.
The vibration suppression device according to any one of claims 1 to 6. each of the viscoelastic bodies is made of a viscous material having fluidity;
the vibration suppression device further includes a casing having the first gap therein and filled with the viscoelastic body.
The vibration suppression device according to any one of claims 1 to 6. Each of the plurality of pipes comprises a branch pipe having one end connected to a main pipe extending along the second direction.
The vibration suppression device according to any one of claims 5 to 8. each of the plurality of pipes includes a first straight portion extending from the one end connected to the main pipe along a direction intersecting each of the first direction and the second direction, and a second straight portion extending from the other end of the first straight portion along the first direction;
the first horizontal section is the second straight section of the first pipe,
The second horizontal portion is composed of the second straight portion of the second piping.
The vibration suppression device according to claim 9. A vibration suppression device for suppressing vibration of a plurality of pipes,
the plurality of pipes include a first pipe having a first horizontal portion extending along a first direction, and a second pipe having a second horizontal portion extending along the first direction and spaced apart from the first horizontal portion on one side of a second direction perpendicular to the first direction,
The vibration suppression device is
a first arm portion fixed to the first horizontal portion and extending from the first horizontal portion toward the second horizontal portion;
a second arm portion fixed to the second horizontal portion and extending from the second horizontal portion toward the first horizontal portion, the second arm portion being configured such that a first gap is formed between the second arm portion and the first arm portion along a third direction perpendicular to each of the first direction and the second direction;
a viscoelastic body provided in the first gap so as to contact the first arm portion and the second arm portion;
a fifth arm portion fixed to the first horizontal portion and extending from the first horizontal portion toward the second horizontal portion, the fifth arm portion being configured such that a third gap is formed between the fifth arm portion and the second arm portion along the third direction on the opposite side of the second arm portion from the first gap;
a viscoelastic body provided in the third gap so as to contact the second arm portion and the fifth arm portion;
a sixth arm portion fixed to the second horizontal portion and extending from the second horizontal portion toward the first horizontal portion, the sixth arm portion being configured such that a fourth gap is formed between the sixth arm portion and the first arm portion along the third direction on the opposite side of the first arm portion from the first gap;
a viscoelastic body provided in the fourth gap so as to contact the first arm portion and the sixth arm portion;
Equipped with
Vibration suppressor. A vibration suppression device for suppressing vibration of a plurality of pipes,
the plurality of pipes include a first pipe having a first horizontal portion extending along a first direction, and a second pipe having a second horizontal portion extending along the first direction and spaced apart from the first horizontal portion on one side of a second direction perpendicular to the first direction,
The vibration suppression device is
a first arm portion fixed to the first horizontal portion and extending from the first horizontal portion toward the second horizontal portion;
a second arm portion fixed to the second horizontal portion and extending from the second horizontal portion toward the first horizontal portion, the second arm portion being configured such that a first gap is formed between the second arm portion and the first arm portion along a third direction perpendicular to each of the first direction and the second direction;
a viscoelastic body provided in the first gap so as to contact the first arm portion and the second arm portion,
each of the viscoelastic bodies is made of a viscous material having fluidity;
the vibration suppression device further includes a casing having the first gap therein and filled with the viscoelastic body.
Vibration suppressor.