KR102602629B1 - vibration isolation device - Google Patents

Abstract

Provided is a vibration isolation device that effectively functions to dampen vibration both when the displacement of the vibration is large and when the displacement is small. The vibration isolating device 10 is provided in the structure 1 including the lower two parts 2 and the upper two parts 3. The vibration isolator 10 is a viscous damper 11, a friction damper 30, and attenuation of vibration by the viscous damper 11 alone and a vibration damper by the combined use of the viscous damper 11 and the friction damper 30. A switching mechanism 40 for switching attenuation is provided. The switching mechanism 40 is installed on the first member 41 installed in the viscous fluid container 12 and the friction transmission plate 31 facing the horizontal movement direction of the first member 41, so that the friction transmission plate 31 When the horizontal displacement of the viscous fluid container 12 exceeds the first predetermined distance L1, the friction transmission plate 31 is horizontally aligned with the viscous fluid container 12 by contacting the first member 41. It is provided with a second member 42 that moves in this direction.

Description

vibration isolation device

The present invention relates to a vibration isolation device provided in a structure including a lower beam portion and an upper beam portion.

Conventionally, in order to improve the vibration isolation properties of structures such as buildings, vibration isolation devices that attenuate vibration in the horizontal direction are installed. For example, in the case of a building, a vibration isolating device is provided between the lower side and the upper side of the building extending horizontally.

As such a vibration isolating device, there is a viscous damper that attenuates horizontal vibration using a viscous fluid with a viscous force, and a hysteretic damper that attenuates horizontal vibration using seismic isolating rubber with a lead plug that has a restoring force. A complex vibration isolating device is known. (For example, see Patent Document 1)

The vibration isolation device of Patent Document 1 is composed of a viscous damper and a hysteretic damper. The viscous damper includes a viscous fluid container installed on the lower side, viscous fluid stored in the viscous fluid container, and a resistance plate that is draped from the upper side and is immersed in the viscous fluid and moves horizontally with respect to the viscous fluid container. The hysteresis type damper includes a seismic isolating rubber with a lead plug whose one end is fixed to a resistance plate, and a fixing plate that fixes the other end of the seismic isolating rubber with a lead plug and the outer surface of the viscous fluid container.

When horizontal vibration acts on the building, the viscous fluid container vibrates horizontally against the resistance plate. In a viscous damper, the viscous fluid between the inner surface of the viscous fluid container and the resistance plate dampens the horizontal vibration of the viscous fluid container relative to the resistance plate. In the hysteresis damper, seismic isolation rubber with a lead plug placed between the outer surface of the viscous fluid container and the resistance plate through the fixing plate attenuates the horizontal vibration of the viscous fluid container relative to the resistance plate.

Patent Document 1: Japanese Patent Application Publication No. 2001-248326

According to the vibration isolation device of Patent Document 1, a viscous damper and a hysteresis damper are installed. However, compared to viscous dampers, hysteresis type dampers are harder (even small displacements result in large loads), so they exert a damping function when the vibration displacement is large (large loads), but in microscopic vibrations (small loads) Since it is not deformed, it cannot dampen vibration. For this reason, if the viscous damper and the hysteresis damper are installed in parallel, the damping performance deteriorates when the displacement of vibration is small.

The purpose of the present invention is to provide a vibration isolation device that effectively functions to dampen vibration both when the displacement of vibration is large and when the displacement is small, in consideration of the problems of the prior art.

[1] The vibration isolating device of the first aspect of the present invention,

A vibration isolating device provided in a structure including a lower two-part and an upper two-part,

a viscous damper that attenuates the horizontal vibration of the lower and upper both parts with a viscous force; a friction damper connected to the viscous damper to attenuate the horizontal vibration of the lower and upper both parts with a frictional force; and It is provided with a switching mechanism for switching between vibration attenuation by a damper alone and vibration attenuation by a combination of the viscous damper and the friction damper,

The viscous damper includes a viscous fluid container fixed on the lower both sides, a viscous fluid stored in the viscous fluid container, and a viscous damper fixed to the upper both sides and hanging down to be immersed in the viscous fluid and at the same time in the viscous fluid container. It has a resistance plate that moves horizontally,

The friction damper includes a friction transmission plate installed to be horizontally movable relative to the resistance plate, and a friction force generating portion installed between the friction transmission plate and the resistance plate of the viscous damper,

The switching mechanism includes a first member installed in the viscous fluid container and a second member installed in the friction transmission plate to face the horizontal movement direction of the first member, and the viscous fluid container relative to the friction transmission plate. When the displacement in the horizontal direction exceeds a first predetermined gap between the horizontal end of the first member and the end of the second member opposite to the end, the friction transfer plate is transferred to the viscous fluid by contacting the first member. It is characterized in that it is moved in a horizontal direction relative to the resistance plate along with the container.

According to the vibration isolating device of the above configuration, it is possible to attenuate vibration in the horizontal direction of the lower and upper sides by the viscous damper and the friction damper. Specifically, on the viscous damper side, when the resistance plate hanging downward while fixed on the upper both sides moves in the horizontal direction with respect to the viscous fluid container fixed on the lower both sides, the viscous fluid stored in the viscous fluid container is released. The horizontal vibration of the resistance plate relative to the container is attenuated.

Additionally, on the friction damper side, when the friction transmission plate moves horizontally with respect to the resistance plate, the horizontal vibration of the resistance plate relative to the friction transmission plate is attenuated by the friction force generating portion provided between the friction transmission plate and the resistance plate. Here, the switching mechanism operates when the horizontal displacement of the viscous fluid container with respect to the friction transmission plate exceeds the first predetermined distance between the horizontal end of the first member and the end of the second member opposing the end, The first member installed in the fluid container comes into contact with the second member installed in the friction transmission plate, and the friction transmission plate moves in the horizontal direction along with the viscous fluid container.

For this reason, when the displacement of the vibration is small and the horizontal displacement of the viscous fluid container relative to the friction transmission plate is within the first predetermined interval, the first member does not contact the second member and the friction transmission plate moves in the horizontal direction. Since this is not done, the friction damper does not work, and only the viscous damper works effectively. Then, when the displacement of the vibration becomes large and the horizontal displacement of the viscous fluid container relative to the friction transmission plate exceeds the first predetermined interval, the first member comes into contact with the second member and the friction transmission plate moves in the horizontal direction. Therefore, the friction damper also acts, and as a result, both the friction damper and the viscous damper act effectively. That is, when the vibration displacement is small, only the viscous damper acts, and when the vibration displacement is large, both the viscous damper and the friction damper act. In this way, it is possible to effectively apply the vibration damping function simultaneously when the vibration displacement is large and small.

[2] Additionally, in the vibration isolating device of the present invention,

In the switching mechanism,

The friction transfer plate is disposed above the viscous fluid container,

The first member is a first convex portion protruding from the top of the viscous fluid container toward the friction transfer plate,

The second member is a second iron portion protruding from the lower part of the friction transfer plate toward the viscous fluid container,

It is preferable that a plurality of the first convex portion and the second convex portion are alternately arranged at predetermined intervals in the horizontal movement direction of the first convex portion.

According to the vibration isolating device of the above configuration, the first member is a first iron portion protruding from the upper part of the viscous fluid container toward the friction transmission plate disposed above, and the second member is a first iron portion protruding from the lower part of the friction transmission plate toward the viscous fluid container. It is a protruding second convex part, and since a plurality of first convex parts and second convex parts are arranged alternately at predetermined intervals, when the first convex part moves in the horizontal direction, it contacts the second convex part at a plurality of places, causing damage only by the viscous damper. It is possible to reliably perform a switch from vibration damping to vibration damping including a friction damper.

[3] Additionally, in the vibration isolating device of the present invention,

It is preferable that the switching mechanism is provided with a shock absorbing mechanism at a portion where the first convex portion and the second convex portion come into contact with each other to alleviate the collision between the first convex portion and the second convex portion.

According to the vibration isolating device of the above configuration, it is possible to smoothly perform contact between the first iron portion and the second iron portion by the buffer mechanism.

[4] The vibration isolating device of the second aspect of the present invention is:

A vibration isolating device provided in a structure including a lower two-part and an upper two-part,

a viscous damper that attenuates the horizontal vibration of the lower and upper both parts with a viscous force; a friction damper connected to the viscous damper to attenuate the horizontal vibration of the lower and upper both parts with a frictional force; and It is provided with a switching mechanism for switching between the attenuation of vibration caused by the damper alone and the attenuation of vibration caused by the friction damper alone,

The viscous damper includes a viscous fluid container fixed on the lower both sides, a viscous fluid stored in the viscous fluid container, a friction transfer plate draped downward while fixed to the upper both sides, and the friction transfer plate from the friction transfer plate. It is provided with a resistance plate that hangs down through a friction damper and is immersed in the viscous fluid and moves horizontally with respect to the viscous fluid container,

The friction damper includes the friction transmission plate, the resistance plate installed to be horizontally movable relative to the friction transmission plate, and a friction force generating portion installed between the resistance plate and the friction transmission plate,

The switching mechanism is installed in the viscous fluid container through a through hole formed to penetrate the resistance plate, and passes through the through hole, so that the horizontal displacement of the viscous fluid container with respect to the resistance plate exceeds a first predetermined interval. It is characterized in that it is provided with a passing member that moves the resistance plate in a horizontal direction relative to the friction transfer plate along with the viscous fluid container by contacting the inner edge of the through hole.

According to the vibration isolating device of the above configuration, it is possible to attenuate vibration in the horizontal direction of the lower and upper sides by the viscous damper and the friction damper. Specifically, on the viscous damper side, when the resistance plate hanging down through the friction damper on the upper both sides moves in the horizontal direction with respect to the viscous fluid container fixed on the lower both sides, the viscous fluid stored in the viscous fluid container is released. The horizontal vibration of the resistance plate relative to the container is attenuated.

Additionally, on the friction damper side, when the friction transmission plate moves horizontally with respect to the resistance plate, the horizontal vibration of the resistance plate relative to the friction transmission plate is attenuated by the friction force generating portion provided between the friction transmission plate and the resistance plate. . Here, the switching mechanism is such that, when the horizontal displacement of the viscous fluid container with respect to the resistance plate exceeds the first predetermined interval, the passing member provided in the viscous fluid container comes into contact with the inner edge of the through hole provided in the resistance plate, and the viscous fluid The resistance plate moves in the horizontal direction along with the container.

For this reason, when the speed and displacement of the vibration are small and the horizontal displacement of the viscous fluid container with respect to the resistance plate is within the first predetermined interval, the passing member does not contact the inner edge of the through hole and the resistance plate is connected to the viscous fluid container. Additionally, since it does not move in the horizontal direction, the friction damper does not work, and only the viscous damper works effectively. Then, when the speed and displacement of the vibration increase, and the horizontal displacement of the viscous fluid container with respect to the resistance plate exceeds the first predetermined interval, the passing member comes into contact with the inner edge of the through hole, and the resistance plate is in contact with the viscous fluid container. Because it moves in the horizontal direction, the viscous damper does not act, and only the friction damper acts. That is, when the speed and displacement of vibration are small, only a viscous damper effective for vibration with small speed and displacement acts, and when the speed and displacement of vibration are large, a friction damper effective for vibration with large speed and displacement acts. In this way, it is possible to effectively actuate the vibration damping function simultaneously when the speed and displacement of vibration are large and when the displacement is small.

[5] Additionally, in the vibration isolating device of the present invention,

In the switching mechanism,

The passing member is an anti-expansion bolt that prevents expansion of the viscous fluid container,

It is preferable that the through hole is a long hole through which the anti-expansion bolt can move.

According to the vibration isolating device of this configuration, the switching mechanism uses an anti-expansion bolt that prevents expansion of the viscous fluid container, and a long hole through which the anti-expansion bolt can move, so it can be simply constructed.

［６］In addition, in the vibration isolating device of the present invention,

It is preferable that the switching mechanism is provided with a shock absorbing mechanism at a portion where the passing member and the inner edge of the through hole come into contact with each other to alleviate the collision between the passing member and the inner edge of the through hole.

According to the vibration isolating device of the above configuration, it is possible to smoothly perform contact between the passing member and the inner edge of the through hole by means of the buffer mechanism.

[Figure 1] A front view conceptually showing the vibration isolation device according to the first embodiment of the present invention.
[Figure 2] A diagram schematically showing the vibration isolation device of Figure 1.
[Figure 3A] A diagram of the operation of the vibration isolation device in Figure 1 without displacement due to vibration.
[Figure 3B] A diagram of the operation of the vibration isolation device in Figure 1 in a state where displacement due to vibration is small.
[Figure 3C] A diagram of the operation of the vibration isolation device in Figure 1 in a state where displacement due to vibration is large.
[Figure 4A] A diagram showing the relationship between damping force and displacement in a state where displacement due to vibration is small in the vibration isolating device of Figure 1.
[Figure 4B] A diagram showing the relationship between damping force and displacement in a state where displacement due to vibration is large in the vibration isolating device of Figure 1.
[Figure 4C] A diagram showing the relationship between damping force and displacement in a state where the displacement due to vibration in the vibration isolating device of Figure 1 is larger.
[Figure 5] A front view showing a vibration isolation device according to a second embodiment of the present invention.
[Figure 6] A diagram schematically showing the vibration isolation device of Figure 5.
[Figure 7A] Operational diagram of the vibration isolation device in Figure 5 without displacement due to vibration.
[Figure 7B] A diagram of the operation of the vibration isolation device in Figure 5 in a state where displacement due to vibration is small.
[Figure 7C] A diagram of the operation of the vibration isolation device in Figure 5 in a state where displacement due to vibration is large.
[FIG. 8A] A diagram showing the relationship between damping force and displacement in a state where displacement due to fluctuations in the vibration isolating device of FIG. 5 is small.
[Figure 8B] A diagram showing the relationship between damping force and displacement in a state where the displacement due to fluctuations in the vibration isolating device of Figure 5 is large.
[Figure 8C] A diagram showing the relationship between damping force and displacement in a state where the displacement due to fluctuations in the vibration isolating device of Figure 5 is larger.

(First Embodiment)

As shown in Fig. 1, the vibration isolating device 10 according to the first embodiment of the present invention is provided in a structure 1, such as a building, for example. The structure (1) is supported by a lower both part (2) extending in the horizontal direction, a pillar (not shown) extending upward from the lower part (2), and a pillar above the lower part (2) in the horizontal direction. It includes upper two parts (3) extending to.

The vibration isolation device 10 includes a viscous damper 11 that attenuates the relative vibration in the horizontal direction of the lower double part 2 and the upper double part 3 by viscous force, and is connected to the viscous damper 11 to form a lower double part 2 and Vibration damping by the friction damper (30) and the viscous damper (11) alone, which damps the horizontal vibration of the upper two parts (3) by friction force, and vibration by the combined use of the viscous damper (11) and the friction damper (30). A switching mechanism 40 for switching attenuation is provided. Switching between viscous dampers alone and in combination is made.

(Configuration of viscous damper (11))

For convenience of explanation, the horizontal direction (left and right direction) in which the lower two parts (2) extend among the horizontal planes is referred to as the X direction, the vertical direction to the direction) is the Z direction.

The viscous damper (11) includes a rectangular viscous fluid container (12) with a bottom fixed so that the bottom surface is in contact with the upper surface of the lower positive part (2), a viscous fluid (13) stored in the viscous fluid container (12), and , It is provided with a resistance plate 14 that is fixed to the upper two parts 3 and hangs down and is immersed in the viscous fluid 13 and moves horizontally with respect to the viscous fluid container 12.

The viscous fluid container 12 has a dimension in the Y direction set to be small compared to the dimensions in the A standing wall portion (16) extending to the lower end of the standing wall portion (16) is installed to extend the bottom portion (15) in the Y direction and is fastened to the lower both portions (2) through a fastening member (17). It is provided with a lower gusset (18). Additionally, the viscous fluid container 12 is provided with an anti-expansion bolt 19 that penetrates the front and rear mouth walls 16 and prevents expansion of the viscous fluid container 12 in the Y direction. There is no problem even if the bottom part 15 and the lower gusset 18 are formed as one piece.

The viscous fluid 13 is, for example, a high-viscosity polymer material such as silicone oil or a hydrocarbon compound, and has flame retardancy, weather resistance, and durability, and is repeated by displacement of the resistance plate 14 relative to the viscous fluid container 12. It is made of a material that does not cause a decrease in viscosity even when the viscous fluid 13 is sheared.

The resistance plate 14 is a plate formed in a substantially rectangular shape when viewed from the front, and is fastened by a fastening member 21 throughout the entire X direction of the upper end, so that the cross section in the YZ plane extends in the X direction in an L shape. It is provided with an upper gusset (22) and a through hole (23) formed long in the horizontal direction in the central part and the lower part. An anti-expansion bolt (19) is passed through the through hole (23). The upper gusset 22 is fastened to the upper both parts 3 through fastening members 21.

(Configuration of friction damper 30)

The friction damper 30 includes a friction transmission plate 31 installed to be horizontally movable in the ±X direction with respect to the resistance plate 14 of the viscous damper 11, and a It is provided with a friction force generating portion 32 installed so as to be sandwiched and supported between directions.

The friction transmission plate 31 is a plate material formed in a substantially rectangular shape horizontally when viewed from the front, and is disposed above the viscous fluid container 12 and on both sides of the resistance plate 14.

The friction force generating unit 32 includes a friction material (not shown) installed on the friction transmission plate 31 and having a predetermined coefficient of friction, and a stainless steel, etc. (not shown) as a counter material installed on the resistance plate 14. (not). The friction transmission plate 31 is formed with a through hole (not shown) through which the fastening member 34 is inserted. A long through hole 33 is formed in the horizontal direction at the upper part of the resistance plate 14, and is inserted into the through hole 33 of the friction transmission plate 31 and the through hole 33 of the resistance plate 14 in the Y direction. The friction transmission plate 31 is fastened to the resistance plate 14 by the fastening member 34. Additionally, the fastening member 34 is composed of PC steel bars, bolts, and nuts. Between the nut and the friction transmission plate 31, an acupressure plate or the like (not shown) having a washer function is arranged in a rectangular shape when viewed from the front.

In addition, in the embodiment, the friction transfer plate 31 is disposed on both sides of the one sheet of resistance plate 14, but this is not limited to this, and the one sheet of friction transfer plate 31 is sandwiched between the two resistance plates 14. It may be configured as such, and the friction force generating portion 32 is installed between the friction transmission plate 31 and the resistance plate 14, and is connected to the friction force generating portion 32 by the axial force of the fastening member 34. When frictional force acts, there is no problem even if the number of friction transmission plates 31 and resistance plates 14 are different.

In the embodiment, the friction force generating portion 32 is installed as a separate member between the friction transmission plate 31 and the resistance plate 14, but the present invention is not limited to this, and the friction force generating portion 32 is installed between the friction transmission plate 31 and the resistance plate 14. There is no problem even if the sliding portions are each friction force generating portion 32 by directly sliding the portion. In addition, in the embodiment, the resistance plate 14 is composed of a single plate, but it is not limited to this, and when fixed to the upper both parts 3 and moved as one piece, the resistance plate 14 generates a friction force. The top and bottom of the portion 32 may be separated into two pieces and connected with fastening members, etc., and there is no problem even if the resistance plate 14 is composed of two, three or more pieces as a whole.

(Configuration of the switching mechanism 40)

The switching mechanism 40 is installed on a plurality of first members 41 installed in the viscous fluid container 12 and on the friction transmission plate 31 opposite to the ±X direction (horizontal direction) of the first members 41. and a plurality of devices arranged to contact the first member 41 when the displacement of the viscous fluid container 12 in the ± A second member 42 is provided. The first predetermined distance L1 is the distance between the horizontal end of the first member 41 and the end of the second member 42 opposite to the end.

In detail, the friction transmission plate 31 is disposed above the viscous fluid container 12. The plurality of first members 41 are first convex portions that protrude from the top of the viscous fluid container 12 toward the friction transmission plate 31 (or in the +Z direction). The second member 42 is a second convex portion that protrudes from the lower part of the friction transfer plate 31 toward the viscous fluid container 12 (or in the -Z direction).

The plurality of first convex portions 41 are arranged to be spaced apart from each other in the X direction. The plurality of second convex portions 42 are arranged to be spaced apart from each other in the X direction. One second convex part 42 is disposed between a pair of adjacent first convex parts 41 at a first predetermined distance L1 that is the same as that of the pair of first members 41 in the X direction. It is done. A plurality of first convex portions 41 and second convex portions 42 are alternately arranged at a first predetermined interval L1 in the horizontal direction. All of the plurality of first convex parts 41 and second convex parts 42 are arranged at equal intervals at a first predetermined interval L1. Additionally, the upper end of the first convex portion 41 is located at a higher position in the +Z direction than the lower end of the second convex portion 42.

In addition, the resistance plate 14 can move in the horizontal direction with respect to the viscous fluid container 12, but the second predetermined interval L2 is until the anti-expansion bolt 19 comes into contact with the through hole 23. It is a range, and the second predetermined interval (L2) is larger than the first predetermined interval (L1). The second predetermined interval L2 is a through hole 23 from the left end of the threaded portion of the anti-expansion bolt 19 in the It is the distance to the left inner edge of , and the distance from the right end of the threaded portion of the anti-expansion bolt 19 in the X direction to the right inner edge of the through hole 23 is also the second predetermined interval L2.

In addition, the switching mechanism 40 includes a buffer mechanism 43 at the portion where the first member 41 and the second member 42 come into contact, which alleviates the collision between the first member 41 and the second member 42. ) is provided. The shock absorbing mechanism 43 is made of, for example, an elastic member.

(Action of viscous damper (11))

In the viscous damper 11, a gap is formed between the viscous fluid container 12 and the resistance plate 14, and the viscous fluid 13 enters the gap. The viscous damper 11 is a viscous fluid caused by relative vibration in the horizontal direction of the resistance plate 14 with respect to the viscous fluid container 12 when the upper double portion 3 vibrates in the horizontal direction with respect to the lower double portion 2. Using the viscous shear resistance of (13), the vibration of the resistance plate (14) relative to the viscous fluid container (12) is attenuated by viscous force.

(Action of friction damper 30)

The friction damper 30 is a damping device that uses the frictional resistance of the friction force generating portion 32, and transmits the axial force or tightening force of the fastening member 34 to the friction material of the friction force generating portion 32 by tightening the fastening member 34. As the resistance plate 14 and the friction transmission plate 31 move relative to each other in the horizontal direction, a dynamic friction force is generated on the friction surface to obtain friction resistance, and the resistance plate 14 relative to the friction transmission plate 31 is obtained. Vibration is dampened by friction.

(Action of switching mechanism 40)

The switching mechanism 40 corresponds to the magnitude of the displacement of the viscous fluid container 12 with respect to the friction transmission plate 31 due to the vibration of the upper both parts 3 with respect to the lower both parts 2, and the viscous damper 11 It is possible to switch between the attenuation of vibration by the alone and the attenuation of vibration by the combined use of the viscous damper 11 and the friction damper 30. If the horizontal displacement of the viscous fluid container 12 with respect to the friction transmission plate 31 is within the first predetermined distance L1, the first member 41 does not contact the second member 42, or Since the second member 42 along with the first member 41 is not displaced even when in contact, only the viscous damper 11 acts.

When the horizontal displacement of the viscous fluid container 12 with respect to the friction transfer plate 31 exceeds the first predetermined distance L1, the first member 41 comes into contact with the second member 42 and The second member 42 is displaced along with the first member 41. For this reason, both the viscous damper 11 and the friction damper 30 act. In this way, the switching mechanism 40 acts only on the viscous damper 11 when the displacement of the second member 42 with respect to the first member 41 is within the first predetermined interval L1, and the first member 41 ), when the displacement of the second member 42 exceeds the first predetermined interval L1, the viscous damper 11 and the friction damper 30 are switched to act.

(Configuration of vibration isolating device 10 of the first embodiment)

As shown in Fig. 2, a vibration isolating device 10 is disposed between the lower and upper sides 2 and 3. In the vibration isolation device 10, the viscous damper 11 and the friction damper 30 are connected in parallel, and a switching mechanism 40 is additionally connected.

When the relative displacement (vibration) of the upper both parts 3 with respect to the lower both parts 2 is small (within the range of the first predetermined interval L1 of the switching mechanism 40), the switching mechanism 40 is operated by the gutter ( Since it is not switched by the first predetermined interval (L1), the vibration is attenuated only by the viscous damper (11).

When the relative displacement (vibration) of the upper both parts 3 with respect to the lower both parts 2 is large (exceeding the first predetermined interval L1 of the switching mechanism 40), the switching mechanism 40 is not switched. Therefore, the friction damper 30 also acts to attenuate vibration in both the viscous damper 11 and the friction damper 30.

(Action of vibration isolating device 10 of the first embodiment)

For convenience of explanation, it is assumed that the upper two parts (3) are displaced relative to the lower two parts (2) when vibrating. As shown in Fig. 3A, in a state in which it is not vibrating, the upper both parts 3 do not move with respect to the lower both parts 2.

As shown in FIG. 3B, in a state where the vibration is small (within the range of the first predetermined interval L1 in FIG. 3A), the upper both parts 3 are displaced relative to the lower both parts 2 as indicated by arrows 1, The friction transmission plate 31 along with the resistance plate 14 is displaced as shown by the arrow 2, thereby attenuating vibration only with the viscous damper 11.

As shown in Fig. 3C, in a state where the vibration is large (range exceeding the first predetermined interval L1 in Fig. 3A), the upper both portions 3 are further displaced relative to the lower both portions 2 as indicated by arrows 3. Then, the second convex part 42 comes into contact with the first convex part 41 and the switching mechanism 40 is switched. The resistance plate 14 is further displaced as shown by the arrow 4, but the friction transmission plate 31 is no longer displaced by the switching mechanism 40. Therefore, the friction transmission plate 31 is displaced relative to the resistance plate 14 as indicated by the arrow 5. As a result, the friction damper 30 also acts to attenuate vibration in both the viscous damper 11 and the friction damper 30.

Since the third predetermined interval L3 from the left end of the resistance plate 14 in the X direction to the inner wall of the viscous fluid container 12 is larger than the second predetermined interval L2 in Fig. 3A, Therefore, the anti-expansion bolt 19 contacts the X-direction end of the through hole 23, and the X-direction end of the resistance plate 14 does not contact the inner wall of the viscous fluid container 12.

(Relationship between damping force and displacement (hysteresis shape))

As shown in Fig. 4A, in a state where the displacement due to vibration is small, the displacement of the switching mechanism 40 is within the first predetermined interval L1 (within the gutter), so only the viscous force due to the viscous damper 11 is used as the damping force. Occurs. Immediately after vibration occurs, the damping force increases as shown by arrow 11, and then only the viscous force acts and the damping force and displacement change as shown by arrow 12.

As shown in FIG. 4B, when the displacement due to vibration is at a medium level, the displacement of the switching mechanism 40 exceeds the first predetermined interval L1 (larger than the gutter), so that as a damping force, A viscous force caused by the viscous damper 11 and a friction force caused by the friction damper 30 are generated. Immediately after vibration occurs, a two-stage curve is formed as shown by arrow 13, and the damping force increases when the displacement is at the middle level. The damping force due to the viscous force of the viscous damper 11 and the frictional force of the friction damper 30 becomes larger than the damping force due only to the viscous force of the viscous damper 11 shown in FIG. 4A.

Next, in a state where both the viscous force and the friction force act, the damping force and displacement change as shown by the arrow 14, and the displacement direction of the vibration becomes opposite, so that the displacement direction of the second convex portion 42 with respect to the first convex portion 41 When this direction is reversed, the displacement changes to decrease as shown by the arrow 15, with only the viscous force acting on the gutter portion of the switching mechanism 40, and the second iron portion 42 is pulled into the first iron portion 41 again. By contacting the switching mechanism 40, viscous force and friction force act as shown by the arrow 16, thereby increasing the damping force. Next, with both viscous force and friction force acting, the damping force and displacement change as shown by arrow 17.

As shown in FIG. 4C, in a state where the displacement due to vibration is larger, the displacement of the switching mechanism 40 exceeds the first predetermined interval L1 (larger than the gutter), so that the viscous damper 11 acts as a damping force. ) and friction force due to the friction damper 30 are generated. The change in damping force is approximately the same as in Fig. 4B, but the displacement becomes larger compared to the state in Fig. 4B.

As described above, according to the configuration of the vibration isolating device 10 of the first embodiment, the horizontal vibration of the lower two parts 2 and the upper two parts 3 is caused by the viscous damper 11 and the friction damper 30. It is possible to attenuate by Specifically, on the viscous damper 11 side, when the resistance plate 14 hanging down from the upper both parts 3 moves horizontally with respect to the viscous fluid container 12 installed on the lower both parts 2, The horizontal vibration of the resistance plate 14 with respect to the viscous fluid container 12 is attenuated by the viscous fluid 13 stored in the viscous fluid container 12.

In addition, on the friction damper 30 side, when the friction transmission plate 31 moves in the horizontal direction with respect to the resistance plate 14, the friction force generating portion installed between the friction transmission plate 31 and the resistance plate 14 ( By 32), the horizontal vibration of the resistance plate 14 with respect to the friction transmission plate 31 is attenuated. Here, the switching mechanism 40 is a second device installed in the viscous fluid container 12 when the horizontal displacement of the viscous fluid container 12 with respect to the friction transmission plate 31 exceeds the first predetermined interval L1. The first member 41 is in contact with the second member 42 installed on the friction transmission plate 31, and the friction transmission plate 31 along with the viscous fluid container 12 is relatively horizontal with respect to the resistance plate 14. move in the direction

For this reason, when the displacement of the vibration is small and the relative horizontal displacement of the viscous fluid container 12 with respect to the friction transmission plate 31 is within the first predetermined interval L1, the first member 41 is the first member 41. Since the friction transmission plate 31 does not relatively move in the horizontal direction because it does not contact the second member 42, the friction damper 30 does not work, and only the viscous damper 11 works effectively.

Then, when the displacement of the vibration becomes large and the relative horizontal displacement of the viscous fluid container 12 with respect to the friction transmission plate 31 exceeds the first predetermined distance L1, the first member 41 Since the friction transmission plate 31 along with the viscous fluid container 12 is in contact with the second member 42 and moves in the horizontal direction relative to the resistance plate 14, the friction damper 30 also acts, resulting in, Both the friction damper 30 and the viscous damper 11 work effectively. That is, when the vibration displacement is small, only the viscous damper 11 acts, and when the vibration displacement is large, both the viscous damper 11 and the friction damper 30 act. In this way, it is possible to effectively apply the vibration damping function simultaneously when the vibration displacement is large and small.

Additionally, in the switching mechanism 40, the first member 41 is a first convex portion 41 that protrudes from the top of the viscous fluid container 12 toward the friction transmission plate 31 disposed above. The second member 42 is a second convex part 42 that protrudes from the lower part of the friction transfer plate 31 toward the viscous fluid container 12, and the first convex part 41 and the second convex part 42 are spaced at a predetermined distance. Since (L1) is arranged in multiple positions alternately, when the first convex portion 41 moves in the horizontal direction, it contacts the second convex portion 42 at multiple locations and causes friction due to vibration attenuation caused by only the viscous damper 11. It is possible to reliably perform the switch to damping of vibration, which also includes the damper 30.

In addition, the switching mechanism 40 can smoothly contact the first convex portion 41 and the second convex portion 42 by using the buffer mechanism 43.

(Second Embodiment)

For the configuration similar to the first embodiment, description will be omitted and symbols will be used. As shown in Figure 5, the vibration isolating device 50 according to the second embodiment of the present invention is provided, for example, in a structure 1 including a lower raised part 2 and an upper raised part 3, such as a building. It is done.

The vibration isolation device 50 includes a viscous damper 51 that attenuates the relative vibration in the horizontal direction between the lower double part 2 and the upper double part 3 by viscous force, and is connected to the viscous damper 51 to form the lower double part 2 and The friction damper 70, which damps the horizontal vibration of the upper both parts 3 by friction force, and the vibration damping by the viscous damper 51 alone are switched between the vibration damping by the friction damper 70 alone. It is provided with a switching mechanism 80 that does.

(Configuration of viscous damper 51)

The viscous damper 51 includes a rectangular viscous fluid container 52 with a bottom fixed so that the bottom is in contact with the upper surface of the lower positive part 2, and a viscous fluid 53 stored in the viscous fluid container 52, The friction transmission plate 71 is fixed to the upper two parts 3 and hangs down, and the friction transmission plate 71 is immersed in the viscous fluid 53 and is immersed in the friction damper 70. It is provided with a resistance plate (54) that moves horizontally with respect to the fluid container (52).

The viscous fluid container 52 has a Y-direction dimension set to be small compared to the It is provided with an extended mouth wall portion 56 and a lower gusset 58 installed at the lower end of the mouth wall portion 56 to extend the bottom portion 55 and fastened to the lower both sides 2 through a fastening member 57. I'm doing it.

Additionally, the viscous fluid container 52 is provided with an anti-expansion bolt 59 that penetrates the front and rear mouth walls 56 and prevents expansion of the viscous fluid container 52 in the Y direction. There is no problem even if the bottom part 55 and the lower gusset 58 are formed as one piece.

The viscous fluid 53 is, for example, a high-viscosity polymer material such as silicone oil or hydrocarbon compound, and is composed of a material that has flame retardancy, weather resistance, and durability, and does not cause a decrease in viscosity even after repeated shearing. there is.

When viewed from the front, the friction transmission plate 71 is a horizontally long, roughly rectangular plate that is fastened throughout the X-direction at the upper end by a fastening member 61 and has an L-shaped cross section in the YZ plane. It is provided with an upper gusset 62 extending in the X direction and a through hole 73 formed long in the horizontal direction in the center. The fastening member 74 is inserted through a through hole (not shown) formed in the upper part of the resistance plate 54 and passes through the through hole 73. The upper gusset 62 is fastened to the upper both parts 3 through fastening members 64.

The resistance plate 54 is a plate formed in a rectangular shape when viewed from the front, and has a through hole (not shown) formed at the top to allow the fastening member 74 to pass through, and a through hole 63 formed in a substantially rectangular shape at the center and bottom. ) is provided. The upper part of the resistance plate 54 overlaps the friction transfer plate 71 in the Y direction, and is inserted into the through hole of the resistance plate 54 and the through hole 73 of the friction transfer plate 71 in the Y direction. The resistance plate 54 is fastened to the friction transmission plate 71 by the fastening member 74. An anti-expansion bolt 59 is passed through the through hole 63.

(Configuration of friction damper 70)

The friction damper 70 includes a friction transmission plate 71 fastened to the upper gusset 62 with a fastening member 61, and a resistance plate 54 installed to be horizontally movable in the ±X direction with respect to the friction transmission plate 71. and a friction force generating portion 72 installed between the resistance plate 54 and the friction transmission plate 71. The friction transmission plate 71 is disposed above the viscous fluid container 52.

The friction force generator 72 includes a friction material (not shown) installed on the friction transmission plate 71 and having a predetermined friction coefficient that generates a friction force greater than the viscous force of the viscous damper 51, and installed on the resistance plate 54. It is made of stainless steel (not shown) as the counterpart material. The friction transmission plate 71 is formed with a through hole 73 through which the fastening member 74 is inserted. A through hole (not shown) is formed in the upper part of the resistance plate 54, and a fastening member is inserted into the through hole of the resistance plate 54 and the through hole 73 of the friction transfer plate 71 in the Y direction. The resistance plate 54 is fastened to the friction transmission plate 71 by (74). Additionally, the fastening member 74 is composed of a threaded steel bar (such as a PC steel bar) and a nut. An acupressure plate (not shown) having a washer function is disposed between the nut and the friction transmission plate 71 in a rectangular shape when viewed from the front.

The fastening member 74 may be composed of a bolt and a nut. In addition, in the embodiment, one sheet of resistance plate 54 is disposed on one sheet of friction transfer plate 71, but the present invention is not limited to this and a configuration in which one sheet of friction transfer plate 71 is sandwiched between two sheets of resistance plates 54. Alternatively, if the friction force generating portion 72 is installed between the friction transmission plate 71 and the resistance plate 54, and the friction force is applied to the friction force generating portion 72 by the axial force of the fastening member 74, There is no problem even if the number of friction transmission plates 71 and resistance plates 54 are different. In addition, in the embodiment, the friction force generating portion 72 is installed as a separate member between the friction transmission plate 71 and the resistance plate 54, but it is not limited to this, and the friction force generating portion 72 is installed between the friction transmission plate 71 and the resistance plate 54. There is no problem even if the plate 54 is directly slid and each of the sliding portions is used as a friction force generating portion 72.

(Configuration of the switching mechanism 80)

The switching mechanism 80 has a substantially rectangular through hole 63 formed to penetrate the resistance plate 54, is installed in the viscous fluid container 52 through the through hole 63, and is connected to the resistance plate 54. When the displacement of the viscous fluid container 52 in the ± In addition, it is provided with a passing member 81 that moves in the ±X direction (horizontal direction), and a first predetermined interval (L1) in the ± ) is set to be smaller than the second predetermined distance L2 at which the resistance plate 54 can move in the ±X direction (horizontal direction) with respect to the friction transmission plate 71.

In the embodiment, a through hole (not shown) was formed in the passing member 81, and an anti-expansion bolt 59 was inserted into the through hole. However, this is not limited to this, and the passing member 81 is connected to an anti-expansion bolt (59). It may be integrated with 59) or may be used as the anti-expansion bolt 59 itself. In this case, the through hole 63 may be a long hole through which the anti-expansion bolt 59 can move.

In addition, the resistance plate 54 is movable in the horizontal direction with respect to the viscous fluid container 52, and the first predetermined interval L1 is the through hole ( 63), and the second predetermined interval (L2) is larger than the first predetermined interval (L1). The second predetermined interval L2 is from the left end of the threaded portion of the fastening member 74 in the It is the distance to the inner edge, and the distance from the right end of the threaded portion of the fastening member 74 in the X direction to the right inner edge of the through hole 73 is also the second predetermined interval L2.

In addition, the switching mechanism 80 includes the passing member 81 or the anti-expansion bolt 59 and the through hole 63 at a portion where the passing member 81 or the anti-expansion bolt 59 contacts the through hole 63. ) is provided with a shock absorbing mechanism 83 that alleviates the collision. The shock absorbing mechanism 83 is made of, for example, an elastic member.

(Action of viscous damper 51)

In the viscous damper 51, a gap is formed between the viscous fluid container 52 and the resistance plate 54, and the viscous fluid 53 is contained in the gap. The viscous damper 51 is a viscous fluid caused by relative vibration in the horizontal direction of the resistance plate 54 with respect to the viscous fluid container 52 when the upper double portion 3 vibrates in the horizontal direction with respect to the lower double portion 2. Using the viscous shear resistance force of (53), the vibration of the resistance plate 54 relative to the viscous fluid container 52 is attenuated by the viscous force.

(Action of friction damper 70)

The friction damper 70 is a damping device that uses the frictional resistance of the friction force generating portion 72. By tightening the fastening member 74, the axial force or tightening force of the fastening member 74 is applied to the friction material of the friction force generating portion 72. Deliver. As the resistance plate 54 and the friction transmission plate 71 move relative to each other in the horizontal direction, a dynamic friction force is generated on the friction surface to obtain friction resistance, and the resistance plate 54 relative to the friction transmission plate 71 is obtained. Vibration is dampened by friction.

(Action of switching mechanism 80)

The switching mechanism 80 operates the viscous damper 51 according to the magnitude of the displacement of the viscous fluid container 52 with respect to the resistance plate 54 due to the vibration of the upper both parts 3 with respect to the lower both parts 2. The vibration damping by the friction damper 70 alone is switched between the vibration damping by the friction damper (70) alone. If the horizontal displacement of the viscous fluid container 52 with respect to the resistance plate 54 is within the first predetermined distance L1, the passing member 81 does not contact the through hole 63, or penetrates even if it contacts the through hole 63. Since the passing member 81 does not tend to displace more than that with respect to the ball 63, only the viscous damper 51 acts. When the horizontal displacement of the viscous fluid container 52 with respect to the resistance plate 54 exceeds the first predetermined distance L1, the passing member 81 comes into contact with the through hole 63 and the viscous fluid container ( 52) and the resistance plate 54 are displaced simultaneously and integrally.

For this reason, the resistance plate 54 is displaced relative to the friction transmission plate 71, and only the friction damper 70 acts. In this way, the switching mechanism 80 acts only on the viscous damper 51 when the horizontal displacement of the viscous fluid container 52 with respect to the resistance plate 54 is within the first predetermined interval L1, and the resistance plate ( When the horizontal displacement of the viscous fluid container 52 relative to 54) exceeds the first predetermined interval L1, only the friction damper 70 is switched to act.

(Configuration of vibration isolation device 50 of the second embodiment)

As shown in FIG. 6, a vibration isolating device 50 is disposed between the lower and upper sides 2 and 3. In the vibration isolation device 50, the viscous damper 51 and the friction damper 70 are connected in series, and a switching mechanism 80 is additionally connected.

When the relative displacement (vibration) of the upper both parts 3 with respect to the lower both parts 2 is small (within the range of the first predetermined interval L1 of the switching mechanism 80), the switching mechanism 80 is operated by the gutter ( Since it is not switched by the first predetermined interval (L1), the vibration is attenuated only by the viscous damper 51.

When the relative displacement (vibration) of the upper both parts 3 with respect to the lower both parts 2 is large (exceeding the first predetermined interval L1 of the switching mechanism 80), the switching mechanism 80 is not switched. Therefore, only the friction damper 70 acts instead of the viscous damper 51 to attenuate vibration.

(Action of vibration isolating device 50 of the second embodiment)

For convenience of explanation, it is assumed that the upper side part 3 is displaced relative to the lower side part 2 when vibrating. As shown in Fig. 7A, in a state in which it is not vibrating, the upper both parts 3 do not move with respect to the lower both parts 2.

As shown in FIG. 7B, in a state where the vibration is small (within the range of the first predetermined interval L1 in FIG. 7A), the upper both parts 3 are displaced relative to the lower both parts 2 as indicated by the arrow 21, The resistance plate 54 along with the friction transmission plate 71 is displaced as shown by the arrow 22, and vibration is attenuated only by the viscous damper 51.

As shown in FIG. 7C, in a state where the vibration is large (range exceeding the first predetermined interval L1 in FIG. 7A), the upper both parts 3 are further displaced relative to the lower both parts 2 as indicated by arrow 23. Then, the passing member 81 comes into contact with the through hole 63 and the switching mechanism 80 is switched. The resistance plate 54 does not displace with respect to the viscous fluid container 52, but the switching mechanism 80 causes the friction transmission plate 71 to displace with respect to the resistance plate 54 as indicated by the arrow 24. As a result, the friction damper 70 acts to attenuate vibration only with the friction damper 70.

In Fig. 7C, when the speed of displacement due to vibration is high, the viscous force exceeds the friction force, so friction force is generated even if the passing member 81 does not contact the through hole 63 in the switching mechanism 80. There is.

(Relationship between damping force and displacement (hysteresis shape))

As shown in Figure 8A, in a state where the displacement due to vibration is small, the displacement of the switching mechanism 80 is within the first predetermined interval L1 (within the gutter), so only the viscous force due to the viscous damper 51 is used as the damping force. Occurs. Immediately after vibration occurs, the damping force increases while the displacement is small, as shown by arrow 31, and then only the viscous force acts, causing the damping force and displacement to change as shown by arrow 32.

As shown in Figure 8B, in a state where the displacement due to vibration is at a medium level, when the displacement of the switching mechanism 80 exceeds the first predetermined interval L1 (larger than the gutter), a damping force is applied to the friction damper 30. Only frictional force is generated. In the range where the displacement of the switching mechanism 80 immediately after the occurrence of vibration is smaller than the first predetermined interval L1, only the viscous force acts as shown by the arrow 33, and the damping force increases, and then the passing member 81 is inserted into the through hole 63. ) is in contact, and only frictional force is applied by the switching mechanism 80 as shown by the arrow 34, thereby increasing the damping force.

Next, in a state where only the friction force is applied, the damping force and displacement change as shown by arrow 35, and the displacement direction of vibration is reversed, and when the displacement direction of the passing member 81 with respect to the through hole 63 becomes reverse, the switch is switched. With only the viscous force acting as much as the gutter portion of the mechanism 80, the displacement changes to become smaller as shown by the arrow 36, and the passing member 81 comes into contact with the through hole 63 again, resulting in the changeover mechanism 80. As shown by arrow 37, only the friction force acts and the damping force increases. Next, with only the friction force acting, the damping force and displacement change as shown by arrow 38.

When the viscous force is greater than the friction force, the friction force begins to occur. Due to the speed dependence of viscous bodies, when the speed of an earthquake is large, the viscous force exceeds the friction force.

As shown in Figure 8C, in a state where the displacement due to vibration is larger, the change in damping force is almost the same as in Figure 8B, but compared to the state in Figure 8B, the displacement becomes larger.

In the first embodiment, the first member 41 is a rectangular first convex portion when viewed from the front, and the second member 42 is a rectangular second convex portion when viewed from the front. However, this is not limited to this. The first member 41 is shaped like a trapezoid or semicircle when viewed from the front, and the second member 42 is also shaped like a trapezoid or semicircle, or the first member 41 is formed as a pin protruding in the +Y direction, and the second member 42 is formed as a pin protruding in the +Y direction. There is no problem with other configurations as long as the friction transmission plate 31 is switched to displace with respect to the resistance plate 14 when the first predetermined distance L1 is exceeded, such as a configuration where 42 is used as a pin receiving portion.

In addition, in the first embodiment, the distance from the left end of the first member 41 to the left end of the second member 42 adjacent to the right and the distance from the left end of the first member 41 to the left adjacent to each other are Both sides of the distance to the right end of the second member 42 are equally displaced to the left and right as the first predetermined distance L1, but this is not limited to this, and the second member adjacent to the right from the left end of the first member 41 ( There is no problem even if the distance to the left end of the first member 41 and the distance from the left end of the first member 41 to the right end of the second member 42 adjacent to the right are set to be unequal.

1‥Structure
2‥Lower both sides
3‥Upper both sides
10, 50‥Vibration control device
11, 51‥Viscous damper
12, 52‥Viscous fluid container
13, 53‥Viscous fluid
14, 54‥Resistance plate
30, 70‥Friction damper
31, 71‥Friction transmission plate
32, 72‥Friction force generation part
40, 80‥Switching mechanism
41‥1st member (1st iron part)
42‥Second member (second iron part)
43, 83‥Buffering mechanism
19, 59‥Anti-expansion bolt
63‥Through hole
81‥Absence of passage
L1‥1st predetermined interval
L2‥2nd predetermined interval
L3‥3rd predetermined interval

Claims (6)

A vibration isolating device provided in a structure including a lower two-part and an upper two-part,
a viscous damper that attenuates the horizontal vibration of the lower and upper both parts with a viscous force; a friction damper connected to the viscous damper to attenuate the horizontal vibration of the lower and upper both parts with a frictional force; and It is provided with a switching mechanism for switching between vibration attenuation by a damper alone and vibration attenuation by a combination of the viscous damper and the friction damper,
The viscous damper includes a viscous fluid container fixed on both lower sides, a viscous fluid stored in the viscous fluid container, and a viscous damper fixed to the upper both sides and hanging downward and immersed in the viscous fluid and in the viscous fluid container. It has a resistance plate that moves horizontally,
The friction damper includes a friction transmission plate installed to be horizontally movable relative to the resistance plate, and a friction force generating portion installed between the friction transmission plate and the resistance plate of the viscous damper,
The switching mechanism is composed of a first member installed in the viscous fluid container, a second member installed on the friction transmission plate opposite to the horizontal movement direction of the first member, and an elastic member, and includes the first member and the second member. A buffering mechanism for relieving the collision between the first member and the second member is provided at a portion where the members come into contact, so that the horizontal displacement of the viscous fluid container with respect to the friction transfer plate is equal to the horizontal direction of the first member. When the first predetermined distance between the end and the end of the second member opposing the end exceeds the first predetermined distance, the friction transmission plate is moved in a relatively horizontal direction with respect to the resistance plate along with the viscous fluid container by contacting the first member. A vibration isolation device characterized in that it moves.
According to paragraph 1,
In the switching mechanism, the friction transmission plate is disposed above the viscous fluid container,
The first member is a first iron portion protruding from the top of the viscous fluid container toward the friction transfer plate,
The second member is a second iron portion protruding from the lower part of the friction transfer plate toward the viscous fluid container,
A vibration isolation device, characterized in that a plurality of the first iron portion and the second iron portion are alternately arranged at predetermined intervals in the horizontal movement direction of the first iron portion.
A vibration isolating device provided in a structure including a lower two-part and an upper two-part,
a viscous damper that attenuates the horizontal vibration of the lower and upper both parts with a viscous force; a friction damper connected to the viscous damper to attenuate the horizontal vibration of the lower and upper both parts with a frictional force; and It is provided with a switching mechanism for switching between the attenuation of vibration caused by the damper alone and the attenuation of vibration caused by the friction damper alone,
The viscous damper includes a viscous fluid container fixed on the lower both sides, a viscous fluid stored in the viscous fluid container, a friction transfer plate draped downward while fixed to the upper both sides, and the friction transfer plate from the friction transfer plate. It is provided with a resistance plate that hangs down through a friction damper and is immersed in the viscous fluid and moves horizontally with respect to the viscous fluid container,
The friction damper includes the friction transmission plate, the resistance plate installed to be horizontally movable relative to the friction transmission plate, and a friction force generating portion installed between the resistance plate and the friction transmission plate,
The switching mechanism has a through hole formed to penetrate the resistance plate, and is installed in the viscous fluid container through the through hole, and when the horizontal displacement of the viscous fluid container with respect to the resistance plate exceeds a first predetermined interval. A vibration isolation device comprising a passing member that moves the resistance plate in a horizontal direction relative to the friction transmission plate along with the viscous fluid container by contacting the inner edge of the through hole.
According to paragraph 3,
In the switching mechanism,
The passing member is an anti-expansion bolt that prevents expansion of the viscous fluid container,
The vibration isolation device is characterized in that the through hole is a long hole through which the anti-expansion bolt can move.
According to paragraph 3,
The vibration isolation device is characterized in that the switching mechanism is provided at a portion where the passing member and the inner edge of the through hole come into contact with a buffering mechanism that alleviates a collision between the passing member and the inner edge of the through hole. delete