JP2019183854A - Vibration control device - Google Patents

Abstract

To provide a structure which enables reduction of vibration in a wide frequency range and achieves excellent durability in a vibration control device which controls vibrations of an engine for a ship.SOLUTION: A vibration control device 100 is disposed between a ship body 2 and a propulsion engine 4. The vibration control device 100 includes a lower plate 11, an upper plate 21, a coil spring 40, and a vibration damping member 30. The lower plate 11 is fixed to the ship body 2 side. The upper plate 21 is disposed above the lower plate 11 and fixed to the propulsion engine 4 side. The coil spring 40 is disposed between the lower plate 11 and the upper plate 21. The vibration damping member 30 is disposed between the lower plate 11 and the coil spring 40 or between the upper plate 21 and the coil spring 40 and is formed including a metal plate 32 and a damping plate 31 formed by a damping material. The metal plate 32 is located between the coil spring 40 and the damping plate 31.SELECTED DRAWING: Figure 2

Description

  The present invention mainly relates to a vibration isolator for isolating a marine engine.

  2. Description of the Related Art Conventionally, a configuration in which a vibration isolator is provided between an engine and a hull in order to make it difficult for vibrations to be transmitted between the engine and the hull is known. Patent document 1 discloses this kind of technique.

  The engine vibration isolator of Patent Literature 1 includes an engine side support portion, a hull side support portion, and a coil spring. The coil spring is disposed between the engine side support portion and the hull side support portion. Patent Document 1 discloses a configuration in which the engine is vibrated by disposing a coil spring between the hull and the engine.

JP 2006-42465 A

  Generally, coil springs are excellent in reducing vibrations in the low frequency range, but there is still room for improvement because vibrations in other frequency ranges cannot be sufficiently reduced. In addition, since the marine engine is heavy, it takes time to replace the vibration isolator. Therefore, a vibration isolator having high durability is desired.

  The present invention has been made in view of the above circumstances, and a main purpose thereof is a vibration isolator for isolating a marine engine, which can reduce vibration in a wide frequency range and is excellent in durability. Is to provide a configuration.

Means and effects for solving the problems

  The problems to be solved by the present invention are as described above. Next, means for solving the problems and the effects thereof will be described.

  According to the viewpoint of this invention, the vibration isolator of the following structures is provided. That is, this vibration isolator is disposed between the hull and the engine. The vibration isolator includes a lower plate, an upper plate, a coil spring, and a vibration damping member. The lower plate is fixed to the hull side. The upper plate is disposed above the lower plate and is fixed to the engine side. The coil spring is disposed between the lower plate and the upper plate. The vibration damping member is disposed between the lower plate and the coil spring or between the upper plate and the coil spring, and includes a metal plate and a damping plate made of a damping material. The metal plate is located between the coil spring and the damping plate.

  Thereby, since vibration is reduced by both the coil spring and the damping plate, vibration in a wide frequency range can be reduced. Furthermore, by disposing the metal plate between the coil spring and the damping plate, it is possible to prevent the engine load from being applied to only a part of the damping plate, so that the durability of the vibration isolator can be improved.

  The above vibration isolator preferably has the following configuration. That is, an engine fixing hole into which an engine fixing bolt for fixing the engine side member to the upper plate is inserted is formed in a portion of the upper plate that contacts the engine side member. An upper plate fixing nut capable of fastening an upper plate fixing bolt for fixing the upper plate to the lower plate is formed below the engine fixing hole.

  Accordingly, the upper plate can be fixed to the lower plate using the engine fixing hole, for example, for the conveyance of the vibration isolator. In addition, since the engine fixing hole is formed in the upper plate, it is possible to prevent the forgetting to remove the upper plate fixing bolt when the engine and the vibration isolator are fixed. Moreover, since the load applied to the upper plate can be reduced, the configuration of the upper plate can be simplified.

  The above vibration isolator preferably has the following configuration. That is, this vibration isolator includes a first side plate and a second side plate. The first side plate is connected to the lower plate and covers between the upper plate and the lower plate. The second side plate is connected to the upper plate and covers between the upper plate and the lower plate. An instrument for visually confirming the space between the upper plate and the lower plate can be inserted between at least one of the first side plate and the second side plate or between the first side plate and the second side plate. In other words, an opening that allows visual observation between the upper plate and the lower plate is formed.

  Thereby, the state of a coil spring, a vibration damping plate, etc. arrange | positioned between an upper board and a lower board can be confirmed.

The schematic side view of a ship provided with the vibration isolator which concerns on one Embodiment of this invention. Sectional drawing of the vibration isolator of the state attached to the engine for propulsion and the hull. The perspective view which shows the attachment method of a vibration isolator. The perspective view which shows the state of the vibration isolator at the time of conveyance before attachment. Assembly drawing of the vibration isolator. The perspective view which shows a mode that the inside of a vibration isolator is confirmed using a fiberscope. The perspective view of the vibration isolator which concerns on the modification provided with the opening / closing structure.

  Next, embodiments of the present invention will be described with reference to the drawings. First, with reference to FIG. 1, the ship 1 provided with the vibration isolator 100 of the present embodiment will be described. FIG. 1 is a schematic side view of the ship 1. In the following description, the left-right direction is defined with the direction in which the ship 1 moves forward. Further, in the following description, terms describing the positional relationship, size, shape, etc. are not only the configuration in which the meaning of the term is completely established, but also the configuration in which the meaning of the term is substantially established. Shall point to.

  As shown in FIG. 1, an engine room 3 is provided in the hull 2 of the ship 1. In the engine room 3, a propulsion engine 4, a power generation engine 8, and a power generation device 9 are arranged.

  The propulsion engine 4 is a diesel engine that generates a driving force for moving the ship 1. The propulsion engine 4 is supported by the hull 2 via a vibration isolator 100 arranged side by side. For example, the propulsion engine 4 is supported by the vibration isolation devices 100 arranged at the four corners. The details of the vibration isolator 100 will be described later.

  The driving force generated by the propulsion engine 4 is transmitted to a reduction gear (not shown) and decelerated to a predetermined rotational speed. A propulsion device 6 is connected to the reduction gear. The propulsion device 6 is a screw or the like that generates a propulsive force for moving the ship 1.

  The power generation engine 8 is a diesel engine that generates a driving force for generating power on the ship. The power generation device 9 generates power using the driving force of the power generation engine 8.

  In this embodiment, the vibration isolator 100 is used to support the propulsion engine 4, but can also be used to support the power generation engine 8. Further, at least one of the propulsion engine 4 and the power generation engine 8 may be an engine having a configuration different from that of the diesel engine (for example, a gasoline engine).

  Next, the vibration isolator 100 will be described with reference to FIGS. FIG. 2 is a cross-sectional view of the vibration isolator 100 attached to the propulsion engine 4 and the hull 2. FIG. 3 is a perspective view showing a method of attaching the vibration isolator 100. As shown in FIG. FIG. 4 is a perspective view showing a state of the vibration isolator 100 during transportation before mounting. FIG. 5 is an assembly diagram of the vibration isolator 100. In FIG. 2, in order to make the configuration easy to understand, the size of some members is changed and displayed.

  Since the plurality of vibration isolator 100 has the same configuration, only one vibration isolator 100 will be described. Note that one of the anti-vibration devices 100 arranged side by side may be configured differently from the other anti-vibration devices 100. In the following description, the state before the vibration isolator 100 is attached to the hull 2 and the propulsion engine 4 may be simply referred to as “before attachment”. In addition, the state after the vibration isolator 100 is attached to the hull 2 and the propulsion engine 4 may be simply referred to as “after attachment”.

  As shown in FIG. 2, the vibration isolator 100 has a lower portion fixed to the hull 2 by a hull fixing bolt 91 and an upper portion fixed to the propulsion engine 4 (specifically, the engine mounting portion 4a) by an engine fixing bolt 92. Is done. Thereby, the vibration which goes to the hull 2 from the propulsion engine 4 can be reduced, or the vibration which goes to the propulsion engine 4 from the hull 2 can be reduced.

  As shown in FIGS. 2 to 5, the vibration isolator 100 includes a lower body 10, an upper body 20, a vibration damping member 30, and a coil spring 40. The lower body 10 (specifically, the lower plate 11) and the upper body 20 (specifically, the upper plate 21) are fixed by upper plate fixing bolts 93 as shown in FIGS. The Thereby, since it can prevent that the lower body 10 and the upper body 20 leave | separate at the time of conveyance etc., conveyance work becomes easy. The upper plate fixing bolt 93 is removed when the vibration isolator 100 is attached to the hull 2 and the propulsion engine 4. In addition, when the upper plate fixing bolt 93 remains after the attachment, the upper plate fixing bolt 93 transmits vibration between the hull 2 and the propulsion engine 4, so that the vibration isolation effect is reduced.

  The lower body 10 includes a lower plate 11 and a first side plate 12. In addition, although the lower body 10 is created by bending a plate material or welding plate materials, it may be produced by a different method.

  The lower plate 11 is a flat plate portion located at the lower end of the vibration isolator 100. The lower plate 11 is used for attachment to the hull 2. Specifically, as shown in FIG. 3 and the like, a plurality of hull fixing holes 13 are formed in the lower plate 11 on the outer side of the first side plate 12. The lower body 10 (that is, the vibration isolator 100) is fixed to the hull 2 by bringing the lower surface of the lower plate 11 into contact with the hull 2 and inserting and tightening the hull fixing bolt 91 into the hull fixing hole 13.

  The first side plate 12 is formed so as to extend upward from the lower plate 11 (so that the thickness direction is the horizontal direction). A total of four first side plates 12 are formed so as to be rectangular in plan view. Further, among the four first side plates 12, openings 14 are respectively provided at both ends and lower ends in the longitudinal direction of the two first side plates 12 arranged so as to face the place where the hull fixing hole 13 is formed. Is formed. In other words, the openings 14 are formed at positions corresponding to the four corners of the first side plate 12 that is rectangular in plan view. The opening 14 is used for visually confirming the state of the vibration damping member 30 and the coil spring 40 disposed therein (details will be described later).

  The upper body 20 includes an upper plate 21 and a second side plate 22. In addition, although the upper body 20 is created by bend | folding a board | plate material or welding board materials, it may be produced by the different method.

  The upper plate 21 is a rectangular flat plate portion positioned at the upper end of the vibration isolator 100. The upper plate 21 is used for mounting the propulsion engine 4. Specifically, as shown in FIG. 3 and the like, an engine fixing hole 23 is formed in the upper plate 21. An engine fixing nut 24 is formed on the lower surface (inner surface) of the upper plate 21 and below the engine fixing hole 23. A part of the propulsion engine 4 or an engine mounting portion 4a which is a mounting member thereof is brought into contact with the upper surface of the upper plate 21, and an engine fixing bolt 92 is inserted into the engine fixing hole 23 and fastened to the engine fixing nut 24. The upper body 20 (that is, the vibration isolator 100) is fixed to the propulsion engine 4.

  Thus, the lower plate 11 is fixed to the hull 2 and the first side plate 12 is fixed to the propulsion engine 4. A single coil spring 40 is disposed between the lower plate 11 and the upper plate 21. Thereby, since the hull 2 and the propulsion engine 4 are connected via the coil spring 40, vibration transmitted from one to the other can be reduced.

  Further, the coil spring 40 is disposed so that the engine fixing nut 24 is positioned inside (the coil spring 40 covers the periphery of the engine fixing nut 24). Thereby, the position shift of the coil spring 40 can be prevented.

  The second side plate 22 is disposed outside the upper plate 21 in plan view. The second side plate 22 has a shape extending downward from the outer edge portion of the upper plate 21. Since the upper plate 21 is rectangular, the upper body 20 is formed with four second side plates 22. The second side plate 22 is located outside the first side plate 12. In addition, the second side plate 22 and the first side plate 12 overlap each other after attachment and in a side view (in other words, the lower end of the second side plate 22 is below the upper end of the first side plate 12). Therefore, the inside of the vibration isolator 100 cannot be directly viewed from the side.

  As shown in FIG. 2, the vibration damping member 30 includes a damping plate 31 and a metal plate 32. The damping plate 31 is made of a damping material such as a vibration-proof rubber or a mesh spring knitted with a metal wire. The damping plate 31 is a member capable of damping in a higher frequency range than the coil spring 40. The damping plate 31 specializes in damping vibrations in the middle and high frequency range of, for example, a frequency of 100 Hz or higher or 200 Hz or higher. The metal plate 32 is made of metal such as steel.

  The attenuation plate 31 and the metal plate 32 are fixed to each other by an adhesive or the like. The attenuation plate 31 is fixed to the upper surface of the lower body 10 (lower plate 11) with an adhesive or the like. The metal plate 32 is disposed between the damping plate 31 and the coil spring 40. In other words, the upper surface of the metal plate 32 is in contact with the coil spring 40, and the lower surface is in contact with the damping plate 31. In other words, the coil spring 40 is supported by the damping plate 31 via the metal plate 32. The vibration damping member 30 may be referred to as a damping steel plate.

  Since the vibration damping member 30 includes the damping plate 31, it is possible to reduce vibrations in a wide frequency range as compared with a configuration in which the vibration damping member 30 alone is used for vibration isolation. Further, the load of the propulsion engine 4 is transmitted to the vibration damping member 30 via the coil spring 40. Here, if the metal plate 32 does not exist, the load of the propulsion engine 4 is applied to the damping plate 31 only at the contact point with the coil spring 40. As a result, the attenuation plate 31 tends to deteriorate. In this regard, as in the present embodiment, when the load is applied to the attenuation plate 31 via the metal plate 32, the load is uniformly applied to the entire attenuation plate 31, so that the attenuation plate 31 is not easily deteriorated. As a result, the durability of the vibration damping member 30 (and hence the durability of the vibration isolator 100) can be increased. Furthermore, since the attenuation plate 31 is covered with the metal plate 32 and the lower plate 11, it is difficult to touch the air, so that deterioration due to oxidation or the like of the attenuation plate 31 can be reduced. Also from this viewpoint, the durability of the vibration damping member 30 can be increased. It is known that the configuration in which the metal plate 32 is added to the attenuation plate 31 has a wider frequency range that can be reduced compared to the configuration in which the attenuation plate 31 is used alone.

  In the present embodiment, the lower plate 11 and the hull 2 are fixed by the hull fixing bolt 91. Further, only the lower plate 11 is located between the head portion of the hull fixing bolt 91 and the hull 2, and the vibration damping member 30 is not located. Thereby, even if the attenuation plate 31 is deformed by a creep phenomenon or the like and the thickness is reduced, it is not necessary to retighten the hull fixing bolt 91.

  Further, a lower spring guide 33 and an upper plate fixing nut 34 are formed on the upper surface of the metal plate 32. The unsprung guide 33 is an annular member that is positioned inside the coil spring 40 and prevents displacement of the coil spring 40.

  The upper plate fixing nut 34 is formed inside a part of the lower spring guide 33. The upper plate fixing nut 34 is formed at a position below the engine fixing hole 23 formed in the upper plate 21 and at the same shaft position. The upper plate fixing nut 34 is used for fixing the upper plate fixing bolt 93 described above. Specifically, as shown in FIGS. 4 and 5, when the vibration isolator 100 is assembled, the upper plate fixing bolt 93 is inserted into the engine fixing hole 23, and the upper plate fixing bolt 93 is inserted into the upper plate fixing nut 34. By fastening, the lower body 10 (lower plate 11) and the upper body 20 (upper plate 21) are fixed.

  That is, the engine fixing hole 23 of the present embodiment is used not only for inserting the engine fixing bolt 92 but also for inserting the upper plate fixing bolt 93. Since the upper plate fixing bolt 93 is smaller than the engine fixing bolt 92, the engine fixing hole 23 is larger than the head portion of the upper plate fixing bolt 93. Therefore, the upper plate fixing bolt 93 is inserted into the engine fixing hole 23 through the fall prevention plate 94. The outer shape of the fall prevention plate 94 is larger than the engine fixing hole 23. Further, the hole formed in the fall prevention plate 94 is larger than the screw portion of the upper plate fixing bolt 93 and smaller than the head portion. Thereby, the fall prevention plate 94 can prevent the upper plate fixing bolt 93 from dropping.

  Further, by sharing the bolt hole between the hull fixing bolt 91 and the upper plate fixing bolt 93, it is possible to prevent the upper plate fixing bolt 93 from being forgotten to be removed at the time of attachment. As described above, the upper plate fixing bolt 93 that is forgotten to be removed is not preferable because it causes vibration transmission. Conventionally, a flat portion is provided on the second side plate, and an upper plate fixing bolt is attached at that position. In this case, since a strong bolt tightening load is applied to the upper plate, the upper plate is required to be strong, and thus the upper plate has to be thickened. In contrast, in the configuration of the present embodiment, a strong bolt tightening load is not applied to the upper plate 21, so that the upper plate can be made thin. Thereby, the weight reduction and cost reduction of the upper body 20 are realizable.

  Next, with reference to FIG. 6, the inspection inside the vibration isolator 100 will be described. FIG. 6 is a perspective view showing how the inside of the vibration isolator 100 is confirmed using the fiberscope 50.

  Also in the conventional vibration isolator, like the vibration isolator 100 of the present embodiment, the periphery of the coil spring is covered, and the inside of the vibration isolator cannot be confirmed. Therefore, in order to check the inside of the vibration isolator, it is necessary to remove the engine supported by the vibration isolator. In view of the Kun store, the vibration isolator 100 of the present embodiment has an opening 14 formed in the first side plate 12. The opening 14 is sized so that the fiberscope 50 can be inserted.

  The operator inserts an instrument such as the fiberscope 50 into the vibration isolator 100 through the opening 14 and confirms the image acquired by the fiberscope 50 to thereby check the state of the vibration damping member 30 and the coil spring 40. It can be confirmed visually. In addition, since the opening part 14 is formed in four corners, the state of the various locations of the coil spring 40 and the state of the vibration damping member 30 of a wide range can be confirmed visually.

  Moreover, it can replace with the structure of this embodiment, and can also provide the structure of FIG. FIG. 7 is a perspective view of a vibration isolator according to a modification having an opening / closing structure. The opening / closing structure is a structure that enables opening / closing of the opening / closing plate 61 that constitutes a part of the second side plate 22. More specifically, the second side plate 22 is formed with an opening 63 by being partially cut away. In addition, an opening / closing plate 61 capable of closing the opening 63 is attached to the upper body 20. The opening / closing plate 61 is rotatably supported by a hinge 62.

  Therefore, the operator can view the state of the vibration damping member 30 and the coil spring 40 directly from the opening 63 or via a mirror or the like by rotating the opening / closing plate 61. The opening / closing structure may be provided on the first side plate 12 instead of the second side plate 22.

  As described above, the vibration isolator 100 according to the present embodiment is disposed between the hull 2 and the propulsion engine 4. The vibration isolator 100 includes a lower plate 11, an upper plate 21, a coil spring 40, and a vibration damping member 30. The lower plate 11 is fixed to the hull 2 side. The upper plate 21 is disposed above the lower plate 11 and is fixed to the propulsion engine 4 side. The coil spring 40 is disposed between the lower plate 11 and the upper plate 21. The vibration damping member 30 is disposed between the lower plate 11 and the coil spring 40 or between the upper plate 21 and the coil spring 40, and includes a metal plate 32 and a damping plate 31 made of a damping material. The metal plate 32 is located between the coil spring 40 and the damping plate 31.

  Thereby, since vibration is reduced by both the coil spring 40 and the damping plate 31, vibration in a wide frequency range can be reduced. Furthermore, by disposing the metal plate 32 between the coil spring 40 and the damping plate 31, it is possible to prevent the load of the propulsion engine 4 from being applied to only a part of the damping plate 31. Can be improved.

  Further, in the vibration isolator 100 of the present embodiment, the member on the propulsion engine 4 side is attached to the upper plate 21 in a portion of the upper plate 21 that contacts the member on the propulsion engine 4 side (engine mounting portion 4a). An engine fixing hole 23 into which an engine fixing bolt 92 for fixing is inserted is formed. Below the engine fixing hole 23, an upper plate fixing nut 34 capable of fastening an upper plate fixing bolt 93 for fixing the upper plate 21 to the lower plate 11 is formed.

  Accordingly, the upper plate 21 can be fixed to the lower plate 11 for transporting the vibration isolator 100, for example, using the engine fixing hole 23. Further, since the engine fixing hole 23 is formed in the upper plate 21, it is possible to prevent the forgetting to remove the upper plate fixing bolt 93 when the propulsion engine 4 and the vibration isolator 100 are fixed. Moreover, since the load applied to the upper plate 21 can be reduced, the configuration of the upper plate 21 can be simplified.

  The vibration isolator 100 according to the present embodiment includes a first side plate 12 and a second side plate 22. The first side plate 12 is connected to the lower plate 11 and covers between the upper plate 21 and the lower plate 11. The second side plate 22 is connected to the upper plate 21 and covers between the upper plate 21 and the lower plate 11. An instrument (fiberscope) for visually confirming between the upper plate 21 and the lower plate 11 between at least one of the first side plate 12 and the second side plate 22 or between the first side plate 12 and the second side plate 22. 50, a mirror or the like) or openings 14 and 63 are formed through which the space between the upper plate 21 and the lower plate 11 can be visually observed.

  Thereby, the states of the coil spring 40 and the damping plate 31 arranged between the upper plate 21 and the lower plate 11 can be confirmed.

  The preferred embodiment of the present invention has been described above, but the above configuration can be modified as follows, for example.

  The vibration damping member 30 of the above embodiment is disposed between the lower plate 11 and the coil spring 40, but may be disposed between the upper plate 21 and the coil spring 40. Further, the vibration damping member 30 may be disposed between both the lower plate 11 and the coil spring 40 and between the upper plate 21 and the coil spring 40.

  In the above embodiment, the bolt holes of the engine fixing bolt 92 and the upper plate fixing bolt 93 are common to the engine fixing hole 23, but may be different. Moreover, although the engine fixing nut 24 and the upper plate fixing nut 34 are disposed inside the coil spring 40, they may be disposed at different locations (for example, between adjacent coil springs 40).

  The opening 14 may be formed in the second side plate 22 instead of the first side plate 12. Further, it may be formed between the first side plate 12 and the second side plate 22.

  In the above embodiment, the vibration damping member 30 is disposed only on a part of the lower plate 11, but the vibration damping member 30 may be disposed on the entire surface of the lower plate 11. In this case, there is a concern that the frequency of retightening the hull fixing bolt 91 described above may increase, but the configuration may be simplified.

  Instead of the configuration of the above embodiment, the unsprung guide 33 can be omitted. Further, instead of the configuration in which the guide is disposed inside the coil spring 40, the guide may be disposed outside the coil spring 40.

  In the vibration isolator 100, a plurality of coil springs 40 may be arranged. Further, the propulsion engine 4 may be configured to be fixed to the vibration isolator 100 with a plurality of engine fixing bolts 92. In this case, a plurality of engine fixing holes 23 and engine fixing nuts 24 are also provided. The number of coil springs 40 and the number of engine fixing bolts 92 may be the same or different.

DESCRIPTION OF SYMBOLS 1 Ship 2 Hull 10 Lower body 11 Lower plate 12 First side plate 13 Hull fixing hole 14 Opening portion 20 Upper body 21 Upper plate 22 Second side plate 23 Engine fixing hole 24 Engine fixing nut 30 Vibration damping member 31 Damping plate 32 Metal plate 40 Coil spring 50 Fiberscope 91 Hull fixing bolt 92 Engine fixing bolt 93 Upper plate fixing bolt

Claims (3)

In the vibration isolator arranged between the hull and the engine,
A lower plate fixed to the hull side;
An upper plate disposed above the lower plate and fixed to the engine side;
A coil spring disposed between the lower plate and the upper plate;
It is disposed between at least one of the lower plate and the coil spring and between the upper plate and the coil spring, and includes a metal plate and a damping plate made of a damping material, A vibration damping member in which the metal plate is positioned between the coil spring and the damping plate;
An anti-vibration device comprising: The vibration isolator according to claim 1,
The upper plate has an engine fixing hole into which an engine fixing bolt for fixing the engine side member to the upper plate is inserted.
A vibration isolator having an upper plate fixing nut capable of fastening an upper plate fixing bolt for fixing the upper plate to the lower plate is formed below the engine fixing hole. The vibration isolator according to claim 1 or 2,
A first side plate connected to the lower plate and covering between the upper plate and the lower plate;
A second side plate connected to the upper plate and covering between the upper plate and the lower plate;
With
An instrument for visually confirming the space between the upper plate and the lower plate can be inserted between at least one of the first side plate and the second side plate or between the first side plate and the second side plate. Or an anti-vibration device in which an opening that allows visual observation between the upper plate and the lower plate is formed.

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