JP2020085079A - Displacement suppression device and seismic isolation system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a displacement suppressing device capable of easily returning an object to an initial position. SOLUTION: A displacement suppressing device 9 for suppressing a relative displacement between a first object 105 and a second object 107 in a predetermined direction has a transmission member 11 and a restoring force generating unit 15. The transmission member 11 is rotatably connected to the first object 105 around the first rotation axis A1 orthogonal to the predetermined direction. Further, the transmission member 11 is rotatably connected to the second object 107 around the second rotation axis A2 parallel to the first rotation axis A1. Further, the transmission member 11 allows the first rotating shaft A1 to approach and separate from the second rotating shaft A2. The restoring force generation unit 15 generates a restoring force with respect to the displacement due to the rotation of the transmission member 11 around the second rotation axis A2. [Selection diagram] Fig. 2

Description

The present disclosure relates to a displacement suppression device that suppresses relative displacement of two objects in an earthquake or the like, and a seismic isolation system that uses the displacement suppression device.

A seismic isolation system is known in which the seismic isolation target is horizontally displaceable with respect to a support structure supporting the seismic isolation target. Such a seismic isolation system can reduce the acceleration applied to the seismic isolation target when an earthquake occurs. However, on the other hand, when the displacement of the seismic isolation target becomes excessive, inconveniences such as a collision between the seismic isolation target and the surrounding structures occur.

Patent Document 1 discloses a technique of converting relative movement (parallel movement) between a seismic isolation target and a structure into rotational movement and transmitting the rotational movement to a rotating mass body. With this configuration, since the mass of the seismic isolation target increases more than it seems, the displacement of the seismic isolation target is suppressed. Further, in Patent Document 1, a friction mechanism is provided in the transmission path from the seismic isolation target to the rotating mass body. This also suppresses the displacement of the seismic isolation target.

The contents described in Patent Document 1 may be incorporated by reference in the present application.

JP, 2009-79662, A

In the configuration of Patent Document 1, when the force that the friction mechanism restricts the movement of the seismic isolation target is greater than the restoring force that attempts to return the seismic isolation target to the initial position (position before the earthquake), after the earthquake , The seismic isolation target does not return to the initial position, and the displacement remains. As a result, labor is required to return the seismic isolation target to the initial position.

Therefore, it is necessary to provide a displacement suppressing device and a seismic isolation system that can easily return the object to the initial position.

A displacement suppression device according to the present disclosure is a displacement suppression device that suppresses relative displacement of a first object and a second object in a predetermined direction, and is orthogonal to the first object with respect to the predetermined direction. The second rotation shaft is rotatably connected about a first rotation axis, and is rotatably connected to the second object about a second rotation axis parallel to the first rotation axis. A transmission member that allows the first rotation shaft to approach and separate from the first rotation shaft, and a restoring force generation unit that generates a restoring force with respect to the displacement of the transmission member due to the rotation around the second rotation shaft. There is.

In one example, the transmission member is separated from the second rotation shaft, in which the actuated portion of the first object located at the position of the first rotation shaft is inserted in the axial direction of the first rotation shaft. It has a guide groove extending from the open position to the second rotation shaft side.

In one example, the displacement suppression device includes a conversion mechanism that converts the rotational movement of the transmission member around the second rotation axis into a translational movement and transmits the translational movement to the restoring force generating unit.

In one example, the displacement suppressing device meshes with an input gear that is fixed to the transmission member concentrically with respect to the second rotation shaft, an output gear to which the rotation of the input gear is transmitted, and the output gear. And a rack connected to the restoring force generating unit, wherein the tangential speed of the outer peripheral surface of the output gear is changed with respect to the tangential speed of the outer peripheral surface of the input gear.

In one example, the displacement suppression device has a speed change mechanism that changes the angular velocity of the transmission member around the second rotation axis and transmits the speed to the restoring force generating unit.

The seismic isolation system according to the present disclosure includes the displacement suppressing device and the other one of the first object and the second object so that the other object is movable in the predetermined direction. And an isolator that supports the object.

According to the above configuration, it is easy to return the object to the initial position.

The schematic diagram which shows the schematic structure of the seismic isolation system which concerns on 1st Embodiment of this indication. 2(a), 2(b) and 2(c) are schematic diagrams for explaining the configuration and operation of the displacement suppressing device in the seismic isolation system of FIG. 3(a), 3(b) and 3(c) are diagrams showing an example of characteristics of the displacement suppression device of FIG. FIG. 4A and FIG. 4B are diagrams showing the results of simulation calculation regarding the operation of the seismic isolation system according to the comparative example and the example. 5A is a schematic diagram illustrating the configuration of the displacement suppression device according to the second embodiment, and FIG. 5B is a partially enlarged view of FIG. 5A. FIG. 6A is a schematic diagram illustrating the configuration of the displacement suppression device according to the third embodiment, and FIG. 6B is a partially enlarged view of FIG. 6A. FIG. 7A is a schematic diagram illustrating the configuration of the displacement suppression device according to the fourth embodiment, and FIG. 7B is a partially enlarged view of FIG. 7A.

Hereinafter, embodiments according to the present disclosure will be described with reference to the drawings. Note that, in the second and subsequent embodiments, basically, only the differences from the previously described embodiments will be described. Matters not particularly mentioned may be the same as those in the embodiment described above. In addition, for the sake of convenience of description, the same reference numerals may be given to configurations corresponding to each other between the plurality of embodiments, even if there are differences.

[First Embodiment]
(Overall structure of seismic isolation system)
FIG. 1 is a schematic diagram showing a schematic configuration of a seismic isolation system 1 according to an embodiment of the present invention. In FIG. 1, the left-right direction of the paper is the horizontal direction, and the up-down direction of the paper is the vertical direction.

The seismic isolation system 1 enables horizontal movement of the seismic isolation target 103 with respect to the support structure 101 that supports the seismic isolation target 103, and suppresses displacement thereof. Note that, in FIG. 1, for convenience, reference numerals of the support structure 101 are attached to a plurality of positions.

Examples of the combination of the seismic isolation target 103 and the support structure 101 include a combination of a building (house or the like) and a base portion that supports the building, a combination of furniture and a building that supports furniture. Among the objects supported by the building, those that are preferably seismically isolated include, for example, works of art and computer devices (servers). In addition, it is preferable that the seismic isolation target placed on the upper floors of the building or on the rooftop vibrates with large acceleration and/or displacement due to the resonance of the building. It is preferably suppressed.

The seismic isolation system 1 includes, for example, an isolator 3 (seismic isolation bearing) that supports the seismic isolation target 103 so as to be movable in the horizontal direction, and a restoration function unit 5 that generates a restoring force that restores the seismic isolation target 103 to the initial position. And a damping function unit 7 that absorbs the vibration of the seismic isolation target 103, and a displacement suppressing device 9 that suppresses the displacement of the seismic isolation target 103.

In the illustrated example, it is assumed that the displacement suppressing device 9 is added to the conventional seismic isolation system. The isolator 3, the restoration function part 5, and the damping function part 7 are parts corresponding to the conventional seismic isolation system. In this case, the configurations of the isolator 3, the restoration function unit 5, and the attenuation function unit 7 may be the same as various known configurations. However, unlike the illustrated example, the displacement suppression device 9 may be considered from the beginning in the design of a new seismic isolation system. In this case, for example, some or all of the restoration function unit 5 and the damping function unit 7 may be included in the displacement suppression device 9.

The isolator 3 is interposed between the support structure 101 and the seismic isolation target 103. The isolator 3 may have the same configuration as that of a known structure, and is, for example, a laminated rubber, a rolling bearing, or a sliding bearing. The isolator 3 may allow the seismic isolation target 103 to move in one horizontal direction, or may allow the seismic isolation target 103 to move in any horizontal direction.

In the description of the operation of the seismic isolation system 1 according to the present embodiment, attention is paid only to one horizontal direction (only the horizontal direction on the paper surface). Further, the restoration function part 5, the damping function part 7, and the displacement suppression device 9 may act on both of the movement to one side and the other side in the one horizontal direction, or to only one. It may also act against. In the following, the former is taken as an example.

The restoration function unit 5 is connected to the support structure 101 and the seismic isolation target 103, and when the seismic isolation target 103 is displaced from the initial position with respect to the support structure 101, in a direction opposite to the displacement. To the seismic isolated object 103. The magnitude of the restoring force increases with an increase in displacement, for example. For example, the magnitude of the restoring force is proportional to the displacement. From another viewpoint, the restoring force of the restoring function unit 5 is 0 when the seismic isolation target object 103 is in the initial position.

The proportional constant when it can be considered that the restoring force is proportional corresponds to the spring constant or the rigidity. In the present disclosure, the change rate of the force that changes according to the displacement as described above may be referred to as a spring constant for convenience. Therefore, for example, even if the term "spring constant" is used for the restoring function unit 5 and the restoring force generating unit 15 described later, these are not limited to those including a spring.

The restoration function unit 5 conceptualizes and shows the function of producing a restoring force in the seismic isolation system before mounting the displacement suppression device 9 (normal seismic isolation system) as a system element. Therefore, in FIG. 1, for the sake of convenience, the restoration function unit 5 is shown separately from the isolator 3, but the restoration function unit 5 may be realized by the isolator 3 or may be provided separately from the isolator 3. The mechanism may be provided, or may be realized by both.

The damping function unit 7 is connected to the support structure 101 and the seismic isolation target 103, and when the seismic isolation target 103 causes a velocity with respect to the support structure 101, a direction opposite to the direction of the velocity. Force (damping force) is generated. The magnitude of the damping force increases, for example, as the speed increases. For example, the magnitude of damping force is proportional to speed.

The damping function unit 7 is, like the restoration function unit 5, conceptually shown as a system element a function of generating a damping force in the seismic isolation system before mounting the displacement suppression device 9 (normal seismic isolation system). is there. Therefore, in FIG. 1, the attenuation function section 7 is shown separately from the isolator 3 for the sake of convenience, but the attenuation function section 7 may be realized by the isolator 3 or may be provided separately from the isolator 3. The mechanism may be provided, or may be realized by both.

The restoration function unit 5 and the damping function unit 7 are connected to the support structure 101 and the seismic isolation target 103 in parallel with each other. It should be noted that, as a reminder, the parallelism here does not mean that the positions in the three-dimensional coordinate system are parallel, but that they are parallel in terms of mechanical action. Therefore, for example, even if the restoration function unit 5 and the damping function unit 7 are located on the opposite sides of the seismic isolation target object 103 and are connected to the support structure 101 and the seismic isolation target object 103, respectively, both functional units Since the force generated by the force acts on the seismic isolation target object 103 in parallel, both functional units are in parallel. The same applies to the displacement suppression device 9.

(Displacement suppression device)
The displacement suppression device 9 is configured by a mechanism that generates a restoring force that attempts to return the seismic isolation target object 103 to the initial position, as indicated by the same symbols as the restoring function unit 5 in FIG. 1. ing. The displacement suppression device 9 is connected to the support structure 101 and the seismic isolation target 103 in parallel with the restoration function unit 5 and the damping function unit 7.

In the illustrated example, the displacement suppression device 9 is arranged in the gap between the support structure 101 and the seismic isolation target 103. From another perspective, it is incorporated in the isolator 3. However, the displacement suppression device 9 may be arranged at a position other than the above, such as laterally or above the seismic isolation target object 103.

2A and 2B are plan views schematically showing the configuration of the displacement suppression device 9. In this figure, the paper surface penetrating direction is the vertical direction, and the paper surface horizontal direction is the paper surface horizontal direction of FIG. 1 (one horizontal direction). FIG. 2A shows a state in which the seismic isolation target object 103 is at the initial position, for example. FIG. 2B shows a state in which the seismic isolation target object 103 is displaced from the position shown in FIG. 2A.

In this figure, a first object 105 that is fixed in at least one horizontal direction (left and right direction on the paper surface) with respect to the seismic isolation object 103 and a fixed object that is fixed in at least one horizontal direction with respect to the support structure 101. The second object 107 is schematically shown.

The first object 105 may be a part of the seismic isolation object 103 or a part of the isolator 3. Similarly, the second object 107 may be a part of the support structure 101 or the isolator 3. For example, the first object 105 and the second object 107 are allowed to move in one horizontal direction (left and right in the plane of the drawing), and are restricted from moving in the other horizontal direction. Specific examples of the first object 105 and the second object 107 are as follows, for example.

Although not particularly shown, the isolator 3 includes a support side member fixed to the support structure 101, a seismic isolation side member fixed to the seismic isolation target 103, and a support side member and a seismic isolation side member. And an intermediate member interposed therebetween. The support side member may be a part of the support structure 101, and the seismic isolation side member may be a part of the seismic isolation target object 103. The intermediate member is connected to the support-side member such that movement in the first horizontal direction is allowed and movement in other horizontal directions is restricted. Further, the intermediate member is connected to the seismic isolation side member so as to be allowed to move in a horizontal second direction orthogonal to the first direction and to be restricted from moving in other horizontal directions. With such a configuration, the seismic isolation target object 103 can be moved in an arbitrary horizontal direction with respect to the support structure 101.

Then, for example, the first object 105 is a seismic isolation side member, the second object 107 is an intermediate member, and the left-right direction on the paper is the second direction. Alternatively, the first object 105 is an intermediate member, the second object 107 is a support-side member, and the left-right direction on the paper surface is the first direction.

Note that FIG. 1 described above may be regarded as a conceptual diagram in which the intermediate member as described above is omitted. Alternatively, FIG. 1 shows that the relative movement between the seismic isolation target 103 and the support structure 101 is allowed only in one horizontal direction, and the displacement suppression device 9 actually operates on the seismic isolation target 103 and the support structure 101. May be regarded as a schematic diagram showing the configuration connected to the. The same applies to the restoration function unit 5 and the attenuation function unit 7 already described.

The displacement suppression device 9 includes, for example, a transmission member 11 connected to the first object 105, a transmission mechanism 13 that transmits a movement (displacement) of the transmission member 11, and a movement of the transmission member 11 via the transmission mechanism 13. The restoring force generating unit 15 is transmitted.

When the first object 105 is displaced with respect to the second object 107, the transmission member 11 is also displaced. This displacement is transmitted to the restoring force generation unit 15 via the transmission mechanism 13, and the restoring force generation unit 15 generates a restoring force according to the displacement. This restoring force is transmitted to the transmitting member 11 via the transmitting mechanism 13 and acts as a restoring force for returning the first object 105 to the initial position. As a result, the displacement of the first object 105 is suppressed. At this time, the displacement suppressing device 9 exerts an action different from that of the restoring function unit 5 described above because the transmission member 11 has a special configuration. Specifically, it is as follows.

(Transmission member)
The transmission member 11 is connected to the acted part 105a of the first object 105. The acted part 105a is configured by, for example, a protruding part that projects in the vertical direction. The acted part 105a is provided so as not to move in the horizontal direction with respect to the main body (reference numeral omitted) of the first object 105.

The transmission member 11 is formed, for example, in a shape that extends in a long shape (arm shape), and has a guide groove 11 a that extends in the longitudinal direction thereof. The actuated portion 105a is inserted into the guide groove 11a and is movable relative to the transmission member 11 along the guide groove 11a. The transmission member 11 is rotatable relative to the first object 105 around the first rotation axis A1 (acted part 105a). In addition, the transmission member 11 is rotatably connected to the second object 107 about a second rotation axis A2 whose one end is vertical (in another perspective, parallel to the first rotation axis A1).

Therefore, when the first target object 105 is displaced in the one horizontal direction (the left-right direction on the paper surface) with respect to the second target object 107, the operated part 105a is guided by the guide groove 11a and moves with respect to the second rotation axis A2. The force in the one horizontal direction is applied to the transmission member 11 while approaching or separating. This force acts as a moment that rotates the transmission member 11 around the second rotation axis A2. Then, the transmission member 11 rotates about the second rotation axis A2 at a rotation amount according to the displacement amount of the first object 105 in the one horizontal direction.

The first rotation axis A1 and the second rotation axis A2 do not refer to specific members, but are conceptual axes that indicate the center of rotation. However, since the first rotation axis A1 is located in the actuated portion 105a, they may be regarded as the same, and the two may not be particularly distinguished in the description of the present embodiment. Similarly, the second rotation axis A2 is located on the shaft member 17 that contributes to the pivotal support of the transmission member 11, and the two may be regarded as the same, and the two may not be particularly distinguished in the description of the present embodiment. .. The first rotation axis A1 is fixed with respect to the first object 105, and the second rotation axis A2 is fixed with respect to the second object 107.

The structure of the acted part 105a may be appropriate. For example, the acted part 105a may be a fixed part with respect to the main body (reference numeral omitted) of the first object 105. Then, for example, the actuated portion 105a is configured to have a circular shape when viewed in parallel to the first rotation axis A1, so that the rotation of the transmission member 11 around the actuated portion 105a may be realized. From another viewpoint, the operated part 105a may slide with respect to the inner wall of the guide groove 11a. Further, for example, the acted part 105a may be a member provided so as to be rotatable around the first rotation axis A1 with respect to the main body of the first object 105. The rotation of the actuated portion 105a may realize the rotation of the transmission member 11 around the actuated portion 105a. From another viewpoint, the actuated portion 105a may roll on the inner wall of the guide groove 11a.

The shape, various sizes and materials of the transmission member 11, the shape and various sizes of the guide groove 11a, the shaft support structure of the transmission member 11 and the like may be appropriately set.

For example, the transmission member 11 has a shape that extends substantially linearly with a constant width. In addition, for example, the guide groove 11a has a shape that extends substantially linearly in parallel with the longitudinal direction of the transmission member 11 with a constant width. From another viewpoint, the transmission member 11 and the guide groove 11a extend, for example, on a straight line connecting the first rotation axis A1 and the second rotation axis A2. In the transmission member 11, any of the width and the thickness (here, the vertical direction) may be larger than the other. For example, the transmission member 11 may have a plate shape whose thickness is smaller than its width.

The length (and position) of the guide groove 11a is such that, even when the maximum displacement, which is assumed as the displacement of the first object 105 with respect to the second object 107, occurs, the actuated portion 105a guides The length may not reach the end of the groove 11a. However, it is also possible to set the length of the guide groove 11a so that the actuated portion 105a reaches the end portion of the guide groove 11a when a displacement less than the assumed maximum displacement occurs.

The length (and the position) of the transmission member 11 may be appropriately set so that the operation described later can be suitably performed in addition to being longer than the guide groove 11a. For example, as shown in FIG. 2A, the transmission member 11 (a straight line connecting the first rotation axis A1 and the second rotation axis A2 from another viewpoint) is the moving direction of the first object 105 (the left-right direction on the paper surface). Let L3 be the distance between the first rotation axis A1 and the second rotation axis A2 in a state orthogonal to. When the distance L3 is long, for example, the moment generated around the second rotation axis A2 due to the movement of the first object 105 becomes large. As a result, a restoring force generating unit 15 that produces a large restoring force is required. Therefore, for example, the distance L3 may be shortened from the viewpoint of reducing the load on the restoring force generating unit 15.

The transmission member 11 is, for example, in the state where the restoring force does not act on the first target object 105 (in other words, when the first target object 105 is in the initial position), for example, the transmission member 11 (the first position in another aspect is the first position). A straight line connecting the rotation axis A1 and the second rotation axis A2 is provided so as to be orthogonal to the moving direction of the first object 105 (left-right direction on the paper surface). From another viewpoint, when the first object 105 is in the initial position, the first rotation axis A1 and the second rotation axis A2 are closest to each other.

Further, for example, the shaft member 17 may be fixed to the transmission member 11 and supported by the second target object 107 so as to be rotatable about the second rotation axis A2 with respect to the second target object 107. Alternatively, the shaft member 17 may be fixed to the second object 107 and support the transmission member 11 rotatably around the second rotation axis A2. In any case, an appropriate bearing may be provided to reduce sliding resistance. Conversely, a damping force for damping the vibration of the seismic isolation target 103 may be obtained by not providing such a bearing or by interposing a friction mechanism. However, the magnitude of this damping force is, for example, a magnitude that does not hinder the return of the seismic isolation target object 103 to the initial position by the restoring force of the restoring function unit 5 and the displacement suppressing device 9.

(Transmission mechanism)
The transmission mechanism 13 functions, for example, as a conversion mechanism that converts the rotational movement of the transmission member 11 into translational movement and transmits the translational movement. Thereby, for example, as the restoring force generating unit 15, a unit that generates a restoring force with respect to the displacement of the linear motion can be used.

Specifically, for example, the transmission mechanism 13 includes an input gear 19 to which the rotation of the transmission member 11 is transmitted, and a rack 21 that meshes with the input gear 19 and is connected to the restoring force generating unit 15. ing. That is, the transmission mechanism 13 constitutes a rack and pinion mechanism. In the drawing, the plurality of teeth included in the gear are not illustrated separately, but are schematically illustrated by hatching or the like.

The input gear 19 is fixed to the transmission member 11 so as to be concentric with the second rotation axis A2, for example. The input gear 19 is supported by the second object 107 so as to be rotatable about the second rotation axis A2 with respect to the second object 107. As a result, the input gear 19 rotates about the second rotation axis A2 together with the transmission member 11 with respect to the second object 107. The shaft support structure of the input gear 19 and the like may be appropriately configured. The specific shape and dimensions of the input gear 19 may also be set appropriately.

For example, the diameter of the input gear 19 (the number of teeth from another viewpoint) may be made relatively large (large). In this case, the amount of movement of the rack 21 is larger than the amount of rotation about the second rotation axis A2. As a result, for example, as the restoring force generating unit 15, it is easy to select one having a small spring constant. As an example in which the diameter of the input gear 19 is relatively large, for example, the radius r3 of the input gear 19 is 1/2 or more of the width of the transmission member 11, 1/5 or more or 1/3 or more of the distance L3 described above, and The case where the length is ⅕ or more or ⅓ or more of the length of the guide groove 11a can be mentioned.

The rack 21 is supported, for example, so as to be movable in a predetermined direction (the left-right direction on the paper surface in the illustrated example) with respect to the second object 107 (basically immovable in other directions). In the illustrated example, the moving direction of the rack 21 is the direction in which the first object 105 moves with respect to the second object 107. However, the rack 21 is set to be a horizontal direction other than the direction in which the first target object 105 moves with respect to the second target object 107 (an arbitrary tangential direction on the circumference around the second rotation axis A2 from another perspective). Good. From another viewpoint, the rack 21 may be engaged with the input gear 19 at any position on the outer circumference of the input gear 19.

Although not particularly shown, it is possible to move the rack 21 in the paper penetration direction by interposing one or more gears including a bevel gear or the like between the input gear 19 and the rack 21. The rack 21 is movable with respect to both the first target object 105 and the second target object 107. Therefore, the rack 21 can be supported by the first object 105 so as to be movable in the extending direction.

The support structure for movably supporting the rack 21 may be an appropriate one such as a linear guide. The specific shape and size of the rack 21 may be set appropriately.

For example, with respect to the length and the movable distance of the rack 21, even when the maximum displacement assumed as the displacement of the first target object 105 with respect to the second target object 107 occurs, the meshing with the input gear 19 is prevented. It may be set such that the rack 21 is maintained and movement of the rack 21 is allowed. However, for example, the rack 21 can be provided so that the movement of the rack 21 is restricted when a displacement equal to or less than the maximum displacement that is assumed occurs. Further, for example, as described above, in the case where the guide groove 11a is configured with a length such that the actuated portion 105a can abut the end of the guide groove 11a before the maximum displacement occurs, Either the contact of the portion 105a with the end of the guide groove 11a or the regulation of the movement of the rack 21 may occur first, or they may occur simultaneously.

(Resilience generating part)
The restoring force generation unit 15 generates a restoring force so as to reduce the input displacement. The restoring force generated by the restoring force generating unit 15 is larger, for example, as the input displacement is larger. For example, the restoring force generator 15 generates a restoring force having a magnitude proportional to the displacement. As will be understood from the description of the transmission mechanism 13, in the present embodiment, the restoring force generating unit 15 generates the restoring force according to the displacement of the rack 21 in the extending direction (in the illustrated example, the horizontal direction of the paper surface).

The configuration of the restoring force generating unit 15 may be the same as various known configurations. For example, the restoring force generator 15 may be configured to include a spiral spring, a leaf spring, an air spring, or rubber. That is, the restoring force generating unit 15 may include an appropriate elastic body, and the elastic force generated by the deformation may be the restoring force. The restoring force generating unit 15 can be realized by a configuration other than the elastic body. For example, the restoring force generation unit 15 may be a mechanism that converts gravity acting on a member that rolls or slides on a curved surface that is concave upward to a restoring force.

A typical example of the restoring force generating unit 15 is a spiral spring having one end connected to the rack 21 and the other end connected to the second object 107. Such a spiral spring is arranged, for example, with the extending direction of the rack 21 as the axial direction (length direction, expansion/contraction direction). However, for example, by interposing a wire hooked on the pulley between the rack 21 and the spiral spring and/or between the spiral spring and the second object 107, the extending direction of the rack 21 is adjusted. It is also possible to differ from the axial direction of the spiral spring.

As another example of the restoring force generating unit 15, for example, a leaf spring that is arranged so as to intersect (for example, orthogonally) in the extending direction of the rack 21 and is connected to the second object 107 and the rack 21 at different positions. Can be mentioned. Further, for example, a torsion spring that produces a restoring force by tightening and rewinding can be used. In this case, for example, by moving the rack 21 in the extending direction thereof, the pair of arms of the torsion spring (both ends extending from the coiled portion) approach and move away from each other so that the pair of arms and the second arm. Connect to the object 107.

The magnitude of the spring constant of the restoring force generating unit 15 may be appropriately set according to the mass of the seismic isolation target object 103, the spring constant of the restoring function unit 5, and the like so that the operation described later is achieved.

(Operation of displacement suppression device)
FIG. 3A is a diagram showing an example of characteristics of the displacement suppressing device 9 as a restoring element (spring). In this figure, the horizontal axis represents the displacement (m) of the first object 105 with respect to the second object 107. The vertical axis represents the restoring force (kN) applied to the first object 105 by the displacement suppression device 9.

Further, FIG. 3B is a diagram showing secant rigidity obtained from the spring characteristics of FIG. In this figure, the horizontal axis is the same as the horizontal axis in FIG. The vertical axis represents the secant rigidity (kN/m) obtained by dividing the value on the vertical axis by the value on the horizontal axis in the characteristic shown in FIG. Since the value on the vertical axis is secant rigidity, it is different from the slope of the tangent line of the curve showing the correspondence between the displacement and the restoring force in FIG. In the present disclosure, the term “rate of change” or “spring constant” refers to the slope of the above tangent line unless otherwise specified.

As shown in these figures, the restoring force generated by the displacement suppressing device 9 is such that the first target object 105 has a relatively small displacement (0.22 m or less in the illustrated example) in the range in which the displacement is relatively small. The larger the displacement of 105, the larger. However, the inclination (spring constant) of the restoring force becomes smaller as the displacement of the first object 105 becomes larger. When the displacement is further increased, the restoring force reaches a peak and further decreases.

FIG. 2C is a schematic diagram for explaining the principle of the above spring characteristics, and corresponds to a partially enlarged view of FIG. 2B.

The restoring force generated by the restoring force generating portion 15 acts on the acted portion 105a as a force F0 in the tangential direction of the circumference around the second rotation axis A2. The force F0 can be decomposed into a component force F1 parallel to the moving direction (horizontal direction) of the first object 105 and a component force F2 in a direction orthogonal to the direction of the component force F1. The component force F1 functions as a restoring force (the restoring force shown in FIG. 3A) that returns the first object 105 to the initial position. The component force F2 balances with a reaction force from a linear guide or the like that restricts the movement of the first object 105 with respect to the second object 107 in the vertical direction of the paper surface.

As shown in FIGS. 2B and 2C, the inclination angle of the transmission member 11 with respect to the direction orthogonal to the moving direction of the first object 105 is θ1. At this time, the component force F1 as the restoring force is represented by F0×cos θ1. Therefore, when the displacement of the first object 105 increases and the inclination angle θ1 increases, the ratio of the component force F1 to the force F0 decreases.

Further, the tilt angle θ1 is the rotation amount of the transmission member 11 and the input gear 19 around the first rotation axis A2 from another viewpoint. The movement amount of the rack 21 is represented by r3×θ1 using the radius r3 of the input gear 19. Further, the inclination angle θ1 is calculated by using the distance L3 between the first rotation axis A1 and the second rotation axis A2 at the initial position and the displacement d3 of the first object 105 (FIG. 2B), arctan(d3 /L3). Therefore, when the displacement d3 increases, the increase amount of the tilt angle θ1 with respect to the increase amount of the displacement d3 decreases, and by extension, the increase amount of the movement amount of the rack 21 with respect to the increase amount of the displacement d3 also decreases. Then, the increase amount of the restoring force (and thus the force F0) generated by the restoring force generating unit 15 also decreases with respect to the increasing amount of the displacement d3.

With the above-described action, as the displacement d3 of the first object 105 increases, the rate of change (spring constant) of the component force F1 as the restoring force for the displacement d3 decreases. As a result, the displacement suppression device 9 exhibits the spring characteristics described with reference to FIGS. 3(a) and 3(b). The amount of change in the spring constant with respect to the displacement d3 can be adjusted by, for example, the distance L3. For example, the shorter the distance L3 is, the larger the increase amount of the tilt angle θ1 with respect to the increase amount of the displacement d3 is, so that the decrease amount of the spring constant with respect to the increase amount of the displacement d3 increases.

By utilizing the characteristics of the displacement suppressing device 9 as described above, the displacement of the seismic isolation target object 103 can be suitably suppressed. Specifically, it is as follows.

FIG. 3C is a diagram showing an example of a natural period of vibration of the seismic isolation target object 103 when the displacement suppressing device 9 having the spring characteristics shown in FIGS. 3A and 3B is used. .. In this figure, the horizontal axis is the same as the horizontal axis in FIG. The vertical axis represents the natural period (s).

Assuming that the natural period T of the seismic isolation target 103 is m and the spring constant of the restoring force acting on the seismic isolation target 103 is k, T=2π/√( k/m). As is clear from this equation, the natural period becomes shorter as the spring constant increases.

The natural period shown in FIG. 3C is a mode in which the restoring force of the displacement suppressing device 9 acts on the seismic isolation target object 103 as the restoring force in addition to the restoring force of the restoring function unit 5. .. Therefore, the natural period of the seismic isolation target 103 is shorter than that before the displacement suppression device 9 is attached (not shown).

Further, as described with reference to FIGS. 3A and 3B, the spring constant of the displacement suppression device 9 decreases as the displacement of the seismic isolation target 103 (first target 105) increases. .. Therefore, the natural period of the seismic isolation target 103 becomes longer as the displacement of the seismic isolation target 103 increases.

In the seismic isolation system 1 as described above, for example, the natural period at the initial position of the seismic isolation target 103 is set to be shorter than the period of the seismic motion having a relatively long period. Specifically, for example, the natural period of the initial position is set to about 2 seconds (for example, 1.5 seconds or more and 2.5. seconds or less. In the illustrated example, about 1.8 seconds). The natural period of a normal seismic isolation system is set to about 4 seconds.

Further, the natural period when the displacement of the seismic isolation target 103 reaches a predetermined magnitude is set to be longer than the period of the seismic motion of a relatively short period. The predetermined displacement is, for example, about 0.3 m (for example, 0.25 m or more and 0.35 m or less). The natural period in this displacement is, for example, about 3 seconds (for example, 2.5 seconds or more and 3.5 seconds or less) or longer.

When the natural period is set in this manner, for example, when a relatively long-period earthquake occurs, the possibility that the vibration of the seismic isolation target object 103 with respect to the support structure 101 resonates with the seismic motion is reduced. As a result, for example, the displacement of the seismic isolation target object 103 with respect to the support structure 101 is suppressed. The suppression of the displacement of the seismic isolation target 103 with respect to the support structure 101 means that the seismic isolation function decreases, and the acceleration of the seismic isolation target 103 in the absolute coordinate system increases. However, in general, the acceleration of long-period ground motion is smaller than the acceleration of short-period ground motion, and the acceleration does not pose a problem.

On the other hand, when a seismic motion having a relatively short cycle occurs, the natural period of the seismic isolation target object 103 near the initial position is close to the seismic motion cycle, so that the acceleration of the seismic isolation target object 103 increases. However, as the displacement of the seismic isolation target 103 with respect to the support structure 101 increases, the natural period becomes shorter, and the natural period and the period of the seismic motion deviate from each other, which reduces the possibility of excessive acceleration. ..

(Example)
The operation of the seismic isolation target 103 in the seismic isolation system of the comparative example and the example was confirmed by simulation calculation. The results are shown below.

The seismic isolation system of the comparative example has a configuration in which the displacement suppression device 9 is omitted from the seismic isolation system of the example (see FIG. 1). The natural period of the seismic isolation system of this comparative example is about 4 seconds. The natural period in the example is as shown in FIG. In the comparative example and the example, the mass of the seismic isolation target object 103 was 0.2 t, and the damping constant was 0.15. As the ground motion data input to the simulation calculation, two types of observation data for earthquakes with a relatively short period and one type of observation data for earthquakes with a relatively long period were used.

A time series data of acceleration and displacement of the seismic isolated object 103 was obtained by a simulation calculation based on the time series data (waveform data) of the ground motion. From this time series data, the maximum value of the displacement of the seismic isolation target 103 with respect to the support structure 101 and the maximum value of the acceleration of the seismic isolation target 103 in the absolute coordinate system were extracted.

FIG. 4A and FIG. 4B are diagrams showing the extraction result. In these figures, the horizontal axis shows the difference between the comparative example and the example, and the input seismic motion. Specifically, “Conv.” indicates a comparative example. “Proposed” indicates an example. Of the three bar graphs in each of the comparative example and the example, the ones on both sides show the results of the seismic motion with a relatively short period, and the center ones show the results of the seismic motion with a relatively long period. The vertical axis of FIG. 4A shows the maximum value (m) of displacement of the seismic isolation target 103 with respect to the support structure 101. The vertical axis of FIG. 4B shows seismic isolation target in the absolute coordinate system. The maximum value (m/s ² ) of the acceleration of the object 103 is shown.

As shown in FIG. 4A, in the example, the displacement of the seismic isolation target 103 with respect to the support structure 101 is suppressed as compared with the comparative example. More specifically, for example, in the comparative example, the maximum value of displacement exceeds 0.3 m, and further, it exceeds 0.4 m. On the other hand, in the embodiment, the maximum displacement value is 0.3 m or less. In general, the allowable displacement of the seismic isolation system is often set to about 0.3 m, and good results are obtained in the examples. Further, in the case where the period of the seismic motion is relatively long (the center one of the three bar graphs), the embodiment is more effective in suppressing the displacement than the comparative example.

On the other hand, as shown in FIG. 4B, in the embodiment, compared with the comparative example, there is a case where the acceleration is increased in exchange for the suppression of displacement. Specifically, in the example, the acceleration is larger than that in the comparative example in the case of an earthquake motion having a relatively short cycle. However, its size is not too large. More specifically, for example, also in the example, the maximum value of acceleration is 3 m/s ² or less. The allowable acceleration of the seismic isolation system is generally set to about 3 m/s ^2, and good results are obtained in the examples.

As described above, in the present embodiment, the displacement suppression device 9 that suppresses the relative displacement between the first object 105 and the second object 107 in the predetermined direction (the left-right direction on the paper surface of FIG. 2A) includes the transmission member 11. And a restoring force generator 15. The transmission member 11 is rotatably connected to the first object 105 about a first rotation axis A1 orthogonal to the predetermined direction. Further, the transmission member 11 is rotatably connected to the second object 107 about a second rotation axis A2 parallel to the first rotation axis A1. Further, the transmission member 11 allows the first rotation shaft A1 to approach and separate from the second rotation shaft A2. The restoring force generation unit 15 generates a restoring force with respect to the displacement caused by the rotation of the transmission member 11 around the second rotation axis A2.

Therefore, for example, as described with reference to FIGS. 2A to 2C and FIG. 3A, the displacement suppression device 9 causes the displacement of the first object 105 with respect to the second object 107. It is possible to realize a spring characteristic in which the spring constant decreases as the value increases. As a result, as described with reference to FIG. 3C, the natural period of the seismic isolation target object 103 can be lengthened as the displacement increases.

As a result, for example, in the case where the seismic isolation system 1 has a relatively short natural period when the seismic isolation target 103 is located near the initial position, when the seismic motion having a long period occurs, the displacement becomes excessive. Can be suppressed. In addition, the seismic isolation system 1 suppresses excessive acceleration by having a relatively long natural period when the seismic isolation target object 103 separates from the initial position when a short-period ground motion occurs. it can.

Further, since the displacement suppressing device 9 does not suppress the displacement by the friction mechanism, the increase in frictional resistance due to the provision of the displacement suppressing device 9 can be suppressed. As a result, it becomes easy to return the seismic isolation target object 103 to the initial position by the restoring force. For example, the seismic isolation system 1 can be automatically restored by its own restoring force (the restoring force of the restoring function unit 5 and the displacement suppressing device 9) without applying an external force.

In addition, in the present embodiment, the transmission member 11 has the guide groove 11a. The actuated portion 105a, which the first object 105 has at the position of the first rotation axis A1, is inserted into the guide groove 11a in the axial direction of the first rotation axis A1. Further, the guide groove 11a extends from the position away from the second rotation axis A2 toward the second rotation axis A2.

In this case, for example, a configuration that allows rotation of the transmission member 11 around the first rotation axis A1 and allows the first rotation axis A1 and the second rotation axis A2 to approach and separate from each other is easily realized.

Further, in the present embodiment, the displacement suppression device 9 has a conversion mechanism (transmission mechanism 13) that converts the rotational movement of the transmission member 11 around the second rotation axis A2 into translational movement and transmits it to the restoring force generating unit 15. ing.

In this case, for example, as described above, as the restoring force generating unit 15, an elastic member that generates a restoring force with respect to linear displacement can be used. Such elastic members generally have various spring constants or the spring constants can be easily set. Therefore, for example, it is easy to appropriately set the spring constant of the restoring force generating unit 15 according to the mass of the seismic isolation target 103.

[Second Embodiment]
FIG. 5A is a plan view similar to FIG. 2A, showing the main configuration of the displacement suppression device 209 according to the second embodiment. FIG. 5B is a partially enlarged view of FIG.

In the transmission mechanism 13 of the first embodiment, the rotation of the input gear 19 that rotates around the second rotation axis A2 together with the transmission member 11 is transmitted to the rack 21. On the other hand, in the transmission mechanism 213 of the present embodiment, a gear that rotates around the second rotation axis A2 together with the transmission member 11 (input gear 219) and a gear that meshes with the rack 21 (output gear 223) are different gears. It is said that. Then, the tangential speed on the outer peripheral surface (a plurality of teeth) of the output gear 223 is shifted (increased in this embodiment) with respect to the tangential speed on the outer peripheral surface of the input gear 219.

The structure for increasing the speed in the tangential direction may be any suitable structure. In the illustrated example, it is as follows.

In addition to the input gear 219 and the output gear 223, the transmission mechanism 213 further includes an intermediate gear 225 that meshes with the input gear 219. In the second to fourth embodiments, various gears of the transmission mechanism are rotatably and immovably supported with respect to the second object 107 unless otherwise specified. The intermediate gear 225 is coaxially fixed to the output gear 223 and rotates together with the output gear 223. That is, the intermediate gear 225 and the output gear 223 form a layered gear.

The intermediate gear 225 has a smaller diameter (fewer teeth) than the input gear 219. Therefore, when the rotation is transmitted from the input gear 219, the intermediate gear 225 rotates at an angular velocity faster than the angular velocity of the input gear 219. This rate of increase in angular velocity is represented by r19/r25 by the diameter r19 of the input gear 219 and the diameter r25 of the intermediate gear 225, assuming that the diameter and the number of teeth are proportional.

The output gear 223 has a larger diameter (more teeth) than the intermediate gear 225. Therefore, when both of them rotate together, the tangential speed of the outer peripheral surface (teeth) of the output gear 223 is faster than the tangential speed of the outer peripheral surface of the intermediate gear 225. The speed increasing ratio in the tangential direction is represented by r23/r25 by the diameter r25 of the intermediate gear 225 and the diameter r23 of the output gear 223, assuming that the diameter and the number of teeth are proportional.

The increase in the angular velocity and the increase in the tangential direction speed are combined, so that the tangential direction speed of the outer peripheral surface of the output gear 223 increases with respect to the tangential direction speed of the outer peripheral surface of the input gear 219. Be speeded up. The speed increasing ratio in the tangential direction is represented by the product of the two speed increasing ratios (r19/r25)×(r23/r25).

As described above, in the present embodiment, the displacement suppression device 209 has the input gear 219, the output gear 223, and the rack 21. The input gear 219 is fixed to the transmission member 11 concentrically with respect to the second rotation axis A2. The rotation of the input gear 219 is transmitted to the output gear 223. The rack 21 meshes with the output gear 223 and is connected to the restoring force generating unit 15. The tangential speed on the outer peripheral surface of the output gear 223 is shifted with respect to the tangential speed on the outer peripheral surface of the input gear 219.

In this case, for example, the diameter of the input gear 219, the displacement of the rack 21 (restoring force generating unit 15), the spring constant of the displacement suppressing device 209, and the like can be adjusted appropriately. Specifically, for example, when the diameter of the input gear 19 of the first embodiment is large, the input gear 19 is a custom-made product. Further, the displacement of the rack 21 meshed with the input gear 19 also becomes large, and it becomes difficult to find a spring (restoring force generating portion 15) having an allowable displacement commensurate with the displacement of the rack 21. However, by appropriately shifting, for example, the diameter of the input gear 219 of the present embodiment is made smaller than that of the input gear 19 of the first embodiment, the displacement of the rack 21 is adjusted, and the restoring force is generated. It is easy to adjust the spring constant required for the portion 15. As a result, for example, it is easy to realize the displacement suppressing device 209 with commercially available components and reduce the cost.

In addition, in this embodiment, from another perspective, the displacement suppression device 9 has a speed change mechanism (transmission mechanism 213) that changes the angular velocity of the transmission member 11 around the second rotation axis A2 and transmits the speed to the restoring force generating unit 15. is doing. In this case, for example, similarly to the above-described tangential direction gear shift, the diameter of the input gear 219, the displacement of the rack 21, the spring constant required for the restoring force generating unit 15, and the like are adjusted, and the displacement is restrained by a commercially available component. Implementing the device 209 is facilitated.

[Third Embodiment]
FIG. 6A and FIG. 6B are diagrams similar to FIG. 5A and FIG. 5B, showing the main configuration of the displacement suppression device 309 according to the third embodiment.

Similar to the transmission mechanism 213 of the second embodiment, the transmission mechanism 313 of the third embodiment has an input gear 219 that rotates around the second rotation axis A2 together with the transmission member 11, and an output gear 323 that meshes with the rack 21. is doing. However, in the present embodiment, contrary to the second embodiment, the tangential speed on the outer peripheral surface of the output gear 323 is reduced with respect to the tangential speed on the outer peripheral surface of the input gear 219. Moreover, from another viewpoint, the transmission mechanism 213 of the second embodiment accelerates the angular velocity, whereas the transmission mechanism 313 of the third embodiment slows the angular velocity. Specifically, for example, it is as follows.

The transmission mechanism 313 of the present embodiment has an intermediate gear 325 that meshes with the input gear 219 and is coaxially fixed to the output gear 323, similarly to the transmission mechanism 213 of the second embodiment. However, the diameter r25 of the intermediate gear 325 is larger than the diameter r19 of the input gear 219, contrary to the second embodiment. Therefore, the angular velocity of the intermediate gear 325 is slower than the angular velocity of the input gear 219. Further, the diameter r23 of the output gear 323 is smaller than the diameter r25 of the intermediate gear 325, contrary to the second embodiment. Therefore, the tangential speed of the outer peripheral surface of the output gear 323 is lower than the tangential speed of the outer peripheral surface of the intermediate gear 325.

Then, the deceleration of the angular velocity and the deceleration of the velocity in the tangential direction are combined so that the velocity in the tangential direction of the outer peripheral surface of the output gear 323 is reduced with respect to the velocity in the tangential direction of the outer peripheral surface of the input gear 219. .. The gear ratio (reduction ratio) is represented by (r19/r25)×(r23/r25), as in the second embodiment.

As described in the second embodiment, by appropriately changing the speed and/or the angular speed in the tangential direction, for example, the diameter of the input gear 219 and the specifications required for the restoring force generating unit 15 are appropriately adjusted. This makes it easier to implement the displacement restraint device 309 with commercially available components. In the second embodiment, the speed increasing function is added, but depending on the mass of the seismic isolation target object 103, the deceleration function as in this embodiment is more suitable for the purpose of adding the speed changing function.

[Fourth Embodiment]
FIG. 7A and FIG. 7B are diagrams similar to FIGS. 5A and 5B, showing the main configuration of the displacement suppression device 409 according to the fourth embodiment.

Like the transmission mechanism 213 of the second embodiment, the transmission mechanism 413 of the fourth embodiment has an input gear 219 that rotates around the second rotation axis A2 together with the transmission member 11 and an output gear 423 that meshes with the rack 21. is doing. Further, in the present embodiment, as in the second and third embodiments, the tangential speed on the outer peripheral surface of the output gear 423 is shifted with respect to the tangential speed on the outer peripheral surface of the input gear 219. Further, similarly to the second and third embodiments, the shift of the angular velocity is also performed.

However, in this embodiment, the number of intermediate gears is increased as compared with the second and third embodiments. Further, in the process in which the rotation is transmitted from the input gear 219 to the output gear 423, the angular velocity is reduced and the tangential velocity is increased. Specifically, it is as follows.

The transmission mechanism 413 includes a first intermediate gear 424 that meshes with the input gear 219 and a second intermediate gear 425 that meshes with the first gear 424. The second intermediate gear 425 is coaxially fixed to the output gear 423, and constitutes the output gear 423 and the overlapping gear.

The diameter r24 of the first intermediate gear 424 is, for example, the same as the diameter r19 of the input gear 219. From the viewpoint of shifting, the first intermediate gear 424 may be eliminated and the input gear 219 and the second intermediate gear 425 may mesh with each other. However, for example, in adjusting various parameters, a gear that does not contribute to such a shift may be useful.

The diameter r25 of the second intermediate gear 425 is larger than the diameter r19 of the input gear 219 (the diameter r24 of the first intermediate gear 424) as in the third embodiment. Therefore, the angular velocity of the second intermediate gear 425 is slower than the angular velocity of the input gear 219. Further, the diameter r23 of the output gear 323 is larger than the diameter r25 of the second intermediate gear 425, as in the second embodiment. Therefore, the tangential speed of the outer peripheral surface of the output gear 423 is faster than the tangential speed of the outer peripheral surface of the second intermediate gear 425.

Then, the speed in the tangential direction of the outer peripheral surface of the output gear 423 is the speed ratio (r19/r25)×( with respect to the speed in the tangential direction of the outer peripheral surface of the input gear 219, as in the second and third embodiments. The speed is changed at r23/r25). Here, since r19/r25<r23/r25, the tangential direction speed of the outer peripheral surface of the output gear 423 is increased with respect to the tangential direction speed of the outer peripheral surface of the input gear 219.

As described above, also in the present embodiment, the speed and/or the angular speed in the tangential direction are changed, so that the same effects as those of the second and third embodiments are achieved. Specifically, for example, it is easy to appropriately adjust the diameter of the input gear 219, the specifications required for the restoring force generating unit 15, and the like, and thus realize the displacement suppressing device 409 with commercially available components. Is facilitated. In the second and third embodiments, only the speed increasing function or only the decelerating function is added. However, depending on the mass of the seismic isolation target object 103 or the like, a combination of the speed increasing function and the decelerating function as in the present embodiment is preferable. Matches the purpose of combining the gear shifting function.

In the above embodiment, the left-right direction (one horizontal direction) of the paper surface of FIG. 1 and FIG. 2A is an example of the predetermined direction. Each of the transmission mechanisms 13, 213, 313 and 413 is an example of a conversion mechanism. Each of the transmission mechanisms 213, 313, and 413 is an example of a transmission mechanism.

The technology according to the present disclosure is not limited to the above embodiments and modifications, and may be implemented in various aspects.

The application target of the displacement suppression device is not limited to the seismic isolation system. Further, the displacement suppression device may exhibit an effect different from the effect without the effect of facilitating the return to the initial position. For example, the first object and the second object are pillars and beams (or members connected to these) of a house, and the displacement suppressing device is used as a device that suppresses the displacement between the pillars and the beams. Good. Further, the first object and the second object may be a house and a furniture with casters (or members connected to these). Houses and fixtures on casters typically do not qualify as seismic isolation systems, but do act like seismic isolation systems.

As can be understood from the above, the displacement suppressed by the displacement suppressing device is not limited to the displacement in the horizontal direction. For example, the displacement suppression device may be for suppressing relative displacement in the vertical direction between the first object and the second object. Similarly, the seismic isolation system is not limited to one that allows movement of the seismic isolation target in the horizontal direction, and may allow movement of the seismic isolation target object in the vertical direction.

In the seismic isolation system of the embodiment, the first object having the first rotation axis (actuated portion) is the seismic isolation object side, and the second object having the second rotation axis is the support structure side. However, conversely, the first object may be the support structure side and the second object may be the seismic isolation object side.

The structure for allowing the rotation of the transmission member around the first rotation axis and the approach and separation of the first rotation shaft and the second rotation shaft is such that the operated portion is inserted into the guide groove provided in the transmission member. Not limited to. For example, a transmission member having a telescopic mechanism may be adopted.

Further, when the transmission member having the guide groove is used, the transmission member is not limited to the arm-shaped member. For example, the transmission member may have a shape that is wider than the shape of an arm.

The guide groove is not limited to extend in a constant width on a straight line connecting the first rotation axis and the second rotation axis. For example, the guide groove may be curved. Further, for example, the width of the guide groove may be changed. In another aspect, in the guide groove, the inner wall with which the operated portion abuts when the displacement occurs in one side in the predetermined direction and the inner wall with which the operated portion abuts when the displacement occurs in the other side in the predetermined direction, The shape and/or the angle may be different. In these cases, for example, the spring characteristic of the displacement suppressing device can be made different when the displacement occurs to one side in the predetermined direction and when the displacement occurs to the other side in the predetermined direction.

When the seismic isolation target object is in the initial position, the transmission member and/or the guide groove may not be orthogonal to the moving direction of the seismic isolation target object, and the first rotation axis may be closest to the second rotation axis. You don't have to be close. Further, when the seismic isolation target object is in the initial position, the restoring force of the restoring force generating unit may not be 0, and may be balanced with the restoring force of other restoring function units.

The restoring force generating unit is not limited to the one that generates the restoring force by the displacement of the linear motion. For example, the restoring force generating unit may be configured by a torsion spring that generates a restoring force by tightening and unwinding, and the displacement of the transmitting member may be transmitted to the restoring force generating unit as the rotational movement. In other words, the conversion mechanism that converts the rotational motion into the translational motion is not an essential requirement in the technology of the present disclosure.

The conversion mechanism that converts the rotational movement into the translational movement is not limited to the rack and pinion mechanism. For example, a link mechanism may be used. Further, the transmission member is extended from the second rotary shaft to the side opposite to the first rotary shaft, and one end of the spiral spring as the restoring force generating portion is fixed to this extended portion to substantially restore the translational motion. It may be input to the generation unit.

Further, the mechanism that transmits the rotation of the transmission member, changes the angular velocity, and changes the tangential velocity is not limited to the gear mechanism. For example, a winding transmission mechanism or a link mechanism may be used. Examples of the winding transmission mechanism include a sprocket and a roller chain, and a pulley and a belt.

DESCRIPTION OF SYMBOLS 1... Seismic isolation system, 9... Displacement suppression device, 11... Transmission member, 15... Restoring force generating part, 105... 1st target object, 105a... Operated part, 107... 2nd target object, A1... 1st rotating shaft , A2... Second rotating shaft.

Claims (6)

A displacement suppressing device for suppressing relative displacement between a first object and a second object in a predetermined direction,
A second rotation axis that is rotatably connected to the first object about a first rotation axis that is orthogonal to the predetermined direction, and that is parallel to the first object with respect to the second object. A transmission member that is rotatably connected around and that allows the first rotary shaft to approach and separate from the second rotary shaft;
A restoring force generating unit that generates a restoring force with respect to the displacement caused by the rotation of the transmission member around the second rotation axis;
Displacement suppression device having. The transmission member is located at a position distant from the second rotation shaft, in which an actuated portion of the first object located at the position of the first rotation shaft is inserted in the axial direction of the first rotation shaft. The displacement suppressing device according to claim 1, further comprising a guide groove extending toward the second rotation shaft. The displacement suppressing device according to claim 1 or 2, further comprising a conversion mechanism that converts a rotational movement of the transmission member around the second rotation axis into a translational movement and transmits the translational movement to the restoring force generating unit. An input gear concentrically fixed to the transmission member with respect to the second rotating shaft;
An output gear to which the rotation of the input gear is transmitted,
A rack that meshes with the output gear and is connected to the restoring force generating unit,
Has
The displacement suppressing device according to any one of claims 1 to 3, wherein a tangential speed on the outer peripheral surface of the output gear is changed with respect to a tangential speed on the outer peripheral surface of the input gear. The displacement suppression device according to any one of claims 1 to 4, further comprising a speed change mechanism that changes an angular velocity of the transmission member about the second rotation axis and transmits the angular speed to the restoring force generating unit. A displacement suppressing device according to any one of claims 1 to 5,
An isolator that supports the other object so that the other object can be moved in the predetermined direction with respect to one of the first object and the second object,
Seismic isolation system that has.

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