JP2010286057A - Base isolation device and rotational inertia addition device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotational inertia addition device which is easily returnable to the original position. <P>SOLUTION: The rotational inertia addition device includes an arm 7, a connector 9, a rotation device 11, etc., and converts the relative movement between a support structure and a base isolation object movably supported to the support structure in a horizontal direction into the rotational motion of a rotational mass body 29. The rotational inertia addition device has a rotational friction mechanism (a connector 9). The connector 9 has a first slider 13 pivoted to the support structure, and a second slider 15 pivoted to the support structure to be slidable on the first slider 13 to which the rotation of the first slider 13 is transmitted via the frictional force between the first slider 13 and itself. The connector 9 is provided in the transmission passage of rotation between a surface 9a to be slid and the rotational mass body 29. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention supports a seismic isolation object that supports a base isolation object by a sliding bearing or a rolling bearing, and converts the vibration of the seismic isolation object due to an earthquake or the like to a long-period vibration. The present invention relates to a rotary inertia adding device.

  In the seismic isolation device, the seismic isolation object is supported so as to be movable in the horizontal direction with respect to the support structure, thereby suppressing the vibration of the support structure from being transmitted to the seismic isolation object. However, when an earthquake in which long-period components are dominant occurs, the displacement of the seismic isolation object relative to the support structure increases.

  Then, the technique which suppresses the displacement with respect to the support structure of a base isolation object is known by converting the motion with respect to the support structure of a base isolation object into rotation of rotation inertia (for example, patent document 1). In addition, below, the code | symbol of drawing of patent document 1 may be attached | subjected in ().

  In the technique of Patent Document 1, a friction slider mechanism (13) is provided in a motion transmission path from a seismic isolation object to a rotating mass body (rotational inertia). Specifically, the friction slider mechanism includes a slide plate (19) disposed horizontally and a slider (17) supported by the slide plate (19) so as to be slidable in the horizontal direction. The slider (17) is fixed to the seismic isolation object, and the sliding plate (19) is provided so that the movement with respect to the support structure is converted into the rotation of the rotating mass body.

  Therefore, in the technique of Patent Document 1, when an earthquake with high acceleration and small displacement occurs, the slider (17) and the sliding plate (19) move relative to each other. As a result, the occurrence of vibration with high acceleration is suppressed in the seismic isolation object. On the other hand, when an earthquake with a small acceleration and a large displacement occurs, the slider (17) and the sliding plate (19) do not move relative to each other, and the motion of the seismic isolation object relative to the support structure does not occur in the rotating mass body. Converted to rotation. As a result, in the seismic isolation object, an increase in displacement with respect to the support structure is suppressed.

JP 2009-79662 A

  In the technique of Patent Document 1, when an earthquake with high acceleration occurs, the relative position between the slider (17) and the slide plate (19) after the earthquake is deviated from the relative position (origin) before the earthquake. Can occur. That is, residual displacement can occur in the friction slider mechanism. Further, residual displacement in the friction slider mechanism may cause residual displacement with respect to the support structure even for the seismic isolation object.

  In order to eliminate the residual displacement of the friction slider mechanism and thus to eliminate the residual displacement of the seismic isolation object (return to the origin), a special mechanism or the like is required. For example, a mechanism for generating a driving force for returning these members to their original positions against the frictional resistance between the slider (17) and the sliding plate (19) must be provided. Alternatively, it is necessary to provide a mechanism for lifting the seismic isolation object and temporarily releasing the frictional resistance between the slider (17) and the sliding plate (19).

  An object of the present invention is to provide a seismic isolation device and a rotary inertia addition device that can easily return to the origin.

  A seismic isolation device according to a first aspect of the present invention provides a support mechanism for supporting a base isolation body so as to be movable in a horizontal direction with respect to a support, and a relative movement between the support and the base isolation body with rotational inertia. A rotary inertia adding device that converts the rotary motion into a rotary motion, and the rotary inertia adding device is rotatably supported around a predetermined rotation axis on a shaft support body that is one of the support body and the seismic isolation body. And a vibrating part connected to a vibrating body that is the other of the support body and the seismic isolation body, and the vibrating part has the pivoted supporting part with respect to the pivoted supporting part. As a reference, a rotation transmission mechanism configured to be movable in one radial direction with respect to the rotation shaft and not movable in a direction perpendicular to the radial direction, and supported by the shaft support, A rotating mass body to which rotation of the pivoted support portion is transmitted, and a first slur supported by the shaft supporting body. And a second slider that is pivotally supported by the shaft support, is slidable with the first slider, and transmits the rotation of the first slider via a frictional force between the first slider and the first slider. And a rotational friction mechanism provided in a transmission path of rotation from the pivoted support portion to the rotating mass body.

  A rotary inertia adding device according to a second aspect of the present invention is a rotary inertia adding device that converts relative movement between a support and an object that is movably supported by the support into a rotary motion of rotary inertia. The shaft support is one of the support and the object, and is supported by a shaft support that is rotatably supported around a predetermined rotation axis, and a vibration body that is the other of the support and the object. A vibration part, wherein the vibration part is movable with respect to the shaft support part in one radial direction with respect to the shaft support part and orthogonal to the radial direction. A rotation transmission mechanism configured to be incapable of moving in the direction of rotation, a rotating mass body that is pivotally supported by the shaft support and transmits the rotation of the pivoted support, and is supported by the shaft support. A first slider that is pivotally supported by the shaft support and is slidable with the first slider. And a second slider to which the rotation of the first slider is transmitted through a frictional force between the first slider and the rotation transmission path from the pivoted support portion to the rotating mass body. And a rotational friction mechanism provided.

  Preferably, the first slider is a member that supports the pivot support portion and rotates together with the pivot support portion around a rotation axis of the pivot support portion, and the second slider pivots on the first slider. It is a supporting member.

  Preferably, the first and second sliders are provided coaxially, and friction surfaces perpendicular to the rotation axes of the first and second sliders slide relative to each other.

  Preferably, the object is supported by the support so as to be movable in the horizontal direction, the shaft support is the support, the vibrating body is the object, and the first The second slider is provided between the support and the object with the rotation axis as a vertical direction, and supports at least a part of the load of the object by the friction surface.

  Preferably, the second slider is pivotally supported by the support body and supports the first slider by the friction surface, and the first slider is in the horizontal plane with respect to a horizontal plane provided on the object. A contact portion that is movable in a horizontal direction with a resistance smaller than the frictional resistance of the friction surface with respect to the horizontal plane, and supports the object by the contact portion, The contact portion is located on the friction surface.

  A rotary inertia adding apparatus according to a third aspect of the present invention is a rotary inertia adding apparatus that converts relative movement between a support and an object that is movably supported on the support into a rotary motion of rotary inertia. A rotating mass body that is pivotally supported by a shaft support body that is one of the support body and the object, and that rotates by transmitting movement of the vibrating body that is the other of the support body and the object to the shaft support body; A first slider that is movable with respect to the shaft support, and is supported by the shaft support, is slidable with the first slider, and is frictionally coupled to the first slider. A second slider that rotates by transmitting the motion of the first slider, and a friction mechanism provided in a motion transmission path from the vibrating body to the rotating mass body. Less than the horizontal design seismic intensity of the object in the object It is configured to slidably when moving occurs.

  A rotational inertia addition apparatus according to a fourth aspect of the present invention is a rotational inertia addition apparatus that converts relative movement between a support and an object that is movably supported on the support into rotational movement of rotational inertia. A rotating mass body that is pivotally supported by a shaft support body that is one of the support body and the object, and that rotates by transmitting movement of the vibrating body that is the other of the support body and the object to the shaft support body; A first slider that is movable with respect to the shaft support, and is supported by the shaft support, is slidable with the first slider, and is frictionally coupled to the first slider. A second slider that rotates by transmitting the motion of the first slider, and a friction mechanism provided in a motion transmission path from the vibrating body to the rotating mass body, the first slider, The coefficient of static friction with the second slider is 0.3 or less

  Preferably, one or more combinations of the rotating mass body and the friction mechanism are provided for the support and the object, and the static friction coefficient in each group is obtained by dividing 0.3 by the number of the combinations. Below the value.

  According to the present invention, the return to origin is easy.

The figure which shows the structure of the rotation inertia addition unit which concerns on the 1st Embodiment of this invention. The figure which shows the structure of the rotation apparatus of the rotation inertia addition unit of FIG. Sectional drawing which shows the structure of the rotational friction mechanism of the rotation inertia addition unit of FIG. The figure explaining operation | movement of the rotation inertia addition unit of FIG. The figure which shows the structure of the rotation inertia addition apparatus which concerns on the 2nd Embodiment of this invention.

(First embodiment)
FIG. 1 is a diagram showing a rotary inertia addition unit 1 according to a first embodiment of the present invention. FIG. 1A is a top view of the rotary inertia addition unit 1 seen through. FIG. 1B is a side view of the rotary inertia addition unit 1 seen through.

  The rotary inertia addition unit 1 has a plurality (four in this embodiment) of rotary inertia addition devices 3A to 3D (hereinafter, A to D may be omitted). The rotary inertia adding device 3 is a relative movement between the support structure A2 (FIG. 1 (b)) and the seismic isolation object A1 (FIG. 1 (b)) supported by the support structure A2 so as to be movable in the horizontal direction. Is converted to rotational motion of rotational inertia. However, the rotary inertia addition device 3 also functions as a support mechanism that supports the seismic isolation object A1 so as to be movable in the horizontal direction with respect to the support structure A2. In other words, the rotation inertia addition device 3 also functions as a seismic isolation device including a support mechanism. The rotary inertia adding unit 1 combined with the rotary inertia adding device 3 also functions as a rotary inertia adding device and also functions as a seismic isolation device.

  The rotary inertia adding device 3 is connected to the seismic isolation object A1, and includes a movable member 5 that vibrates together with the seismic isolation object A1, an arm 7 that is rotated around the rotation axis RA by the vibration of the movable member 5, and an arm 7. It has a connector 9 that pivotally supports the support structure A2, and a rotation device 11 that is provided on the support structure A2 and converts the rotation input from the connector 9 into a rotational motion of rotational inertia.

  The movable member 5 is formed in, for example, a substantially cylindrical shape, and is arranged with the vertical direction being the axial direction of the cylinder. The movable member 5 is fixed to the seismic isolation object A1, and is movable in the horizontal direction integrally with the seismic isolation object A1.

  For example, the arm 7 is provided so that the rotation axis RA is a vertical axis and extends linearly from the rotation axis RA in the horizontal direction. The arm 7 is configured to be movable relative to the movable member 5 in the radial direction of the circle centered on the rotation axis RA, and to be engageable with the movable member 5 in the tangential direction of the circle centered on the rotation axis RA. .

  Specifically, the arm 7 is formed with a groove 7a (FIG. 1A) into which the movable member 5 is slidably inserted. The groove portion 7 a extends from the connector 9 side to the distal end side (radially outward) of the arm 7 along the longitudinal direction of the arm 7. When the seismic isolation object A1 is not oscillating, the movable member 5 is arrange | positioned at the center of the longitudinal direction of the groove part 7a, for example. The movable member 5 is appropriately provided with a flange or the like for preventing the movable member 5 from coming off from the groove portion 7a.

  The peripheral portion of the arm 7 around the connector 9 (the pivoted support portion 7b) and the movable member 5 are slidably inserted into the groove portion 7a of the arm 7 so that the pivoted support portion 7b is used as a reference. (Based on a rotating coordinate system x′y′z ′ (see FIG. 4) rotating with the rotation of the pivoted support portion 7b), movable in one radial direction with respect to the rotation axis RA, and orthogonal to the radial direction It becomes impossible to move in the direction to do.

  The connector 9 is formed, for example, in a substantially columnar shape, and is fixed to the end portion of the arm 7 on the rotation axis RA side. The connector 9 is pivotally supported by the support structure A <b> 2 via the rotation device 11 so as to be rotatable around the rotation axis RA, and is rotatable together with the arm 7.

  In addition, the connector 9 supports the sliding surface A1a provided on the lower surface of the seismic isolation object A1 by the sliding surface 9a (FIG. 1B) provided on the upper surface. The sliding surface A1a is substantially horizontal and wider than the sliding surface 9a. The sliding surface 9a and the sliding surface A1a are formed with a relatively low coefficient of static friction and are slidable with respect to each other. The static friction coefficient of the sliding surface 9a and the sliding surface A1a is smaller than the static friction coefficient of the friction surface Sp described later, for example, less than 0.2. The rotation inertia addition device 3 functions as a support mechanism by supporting the seismic isolation object A1 by the sliding surface 9a.

  The plurality of rotary inertia adding devices 3 provided in the rotary inertia adding unit 1 are arranged so that the longitudinal directions of the arms 7 are different from each other when the seismic isolation object A1 is not vibrating. For example, in the four rotary inertia adding devices 3, two arms 7 are arranged in one direction (x direction), and the other two are arranged in a direction (y direction) orthogonal to the one direction. The rotary inertia adding devices 3 along which the arms 7 extend in the same direction are arranged so that the directions from the connector 9 to the distal end side of the arms 7 are opposite to each other.

  FIG. 2 is an enlarged view of the rotating device 11. FIG. 2A is a side view of the rotating device 11 seen through. FIG. 2B is a top view of the rotating device 11 seen through. Note that FIG. 2 is conceptual, and the number of teeth and the size of the gears are not precise.

  The rotating device 11 is fixed to the connector 9 (FIG. 2A), and can rotate with the connector 9 around the rotation axis RA with respect to the support structure A2, and the rotation of the rotating housing 25 is increased. A speed gear mechanism 27 and a rotating mass body 29 to which rotation increased by the gear mechanism 27 is transmitted are provided.

  The rotating housing 25 is formed in a substantially cylindrical shape with the rotation axis RA as an axis, for example. The rotary casing 25 is pivotally supported so as to be rotatable about the rotation axis RA with respect to the support structure A2. For example, as shown in FIG. 2A, the rotating device 11 is supported by the lower plate 31 fixed to the support structure A <b> 2, the column member 33 erected on the lower plate 31, and the column member 33. An upper plate 35, a lower plate 31, and a main shaft member 37 that is pivotally supported by the upper plate 35 are included, and the rotary housing 25 is rotatably inserted into the rotary housing 25. Thus, it can rotate around the rotation axis RA. Further, as shown in FIG. 2A, the rotating casing 25 can be rotated around the rotation axis RA by supporting the lower edge portion of the outer peripheral surface portion on the lower plate 31 via the bearing 39. It has become. The connector 9 is pivotally supported on the support structure A2 via the rotary casing 25.

  The gear mechanism 27 is accommodated in the rotary casing 25. Specifically, the gear mechanism 27 is disposed between the lower plate 31 and the upper plate 35. The gear mechanism 27 includes an input gear portion 25a (FIG. 2B) formed on the inner surface of the outer peripheral surface portion of the rotary casing 25, a first gear 41 that meshes with the input gear portion 25a, The second gear 43 has a small-diameter gear 43a that engages and a large-diameter gear 43b that is larger in diameter than the small-diameter gear 43a, and a third gear 45 that meshes with the large-diameter gear 43b of the second gear 43.

  The first gear 41 and the second gear 43 are rotatably supported around a rotation axis parallel to the rotation axis RA with respect to the support structure A2 via shaft members supported by the lower plate 31 and the upper plate 35, respectively. Has been. The third gear 45 is fixed to the main shaft member 37. A rotating mass body 29 is fixed to the main shaft member 37. Accordingly, the rotation of the rotary casing 25 is transmitted to the third gear 45 via the input gear portion 25 a, the first gear 41 and the second gear 43, and the rotating mass body 29 rotates together with the third gear 45. .

  The number of teeth of the first gear 41 is less than the number of teeth of the input gear portion 25 a, and the first gear 41 rotates at a higher speed than the rotating housing 25. The number of teeth of the small-diameter gear 43 a of the second gear 43 is smaller than the number of teeth of the first gear 41, and the second gear 43 rotates at a higher speed than the first gear 41. The number of teeth of the third gear 45 is smaller than the number of teeth of the large-diameter gear 43 b of the second gear, and the third gear 45 rotates at a higher speed than the second gear 43. Accordingly, the rotation of the rotary casing 25 is accelerated by the gear mechanism 27 and transmitted to the rotary mass body 29.

  The rotating mass body 29 is accommodated in the rotating housing 25. Specifically, the rotating mass body 29 is disposed between the upper end surface of the rotating housing 25 and the upper plate 35. The rotating mass body 29 is pivotally supported with respect to the support structure A <b> 2 by being fixed to the main shaft member 37. The rotating mass body 29 is formed of a material having a high density such as a metal and has a large outer diameter so that the rotational inertia is larger than that of the gear included in the gear mechanism 27, for example.

  The connector 9 is configured to function as a rotational friction mechanism. Specifically, the connector 9 includes a first slider 13 that is fixed to the arm 7, a second slider 15 that is fixed to the rotary housing 25, and is slidable around the rotation axis RA with respect to the first slider 13. have. The first slider 13 and the second slider 15 are made of metal such as iron, for example.

  FIG. 3 is a cross-sectional view of a part of the connector 9.

  The first slider 13 has a protrusion 13a that protrudes toward the second slider 15 coaxially with the rotation axis RA. The planar shape of the protrusion 13a (the shape seen in the direction of the rotation axis RA) is a circle. On the other hand, the second slider 15 has a recess 15a into which the protrusion 13a is generally fitted. By fitting the protrusion 13a into the recess 15a, the first slider 13 and the second slider 15 are allowed to rotate around the rotation axis RA, but are restricted from moving in a direction perpendicular to the rotation axis RA.

  The mutually opposing surfaces of the first slider 13 and the second slider 15 can slide with a predetermined coefficient of friction. Specifically, the set of the top surface 13b of the protrusion 13a and the bottom surface 15b of the recess 15a, the set of the side surface 13c of the protrusion 13a and the side surface 15c of the recess 15a, and the outer peripheral side of the protrusion 13a and the recess 15a. At least one of the set of the first annular surface 13d and the second annular surface 15d is slidable.

  Preferably, at least one of the set of the top surface 13b and the bottom surface 15b and the set of the first annular surface 13d and the second annular surface 15d facing each other in the direction of the rotation axis RA slides. In this case, a bearing may be provided between the side surface 13c and the side surface 15c in order to minimize the frictional resistance between these surfaces.

  Hereinafter, a friction surface constituted by at least one of the set of the top surface 13b and the bottom surface 15b and the set of the first annular surface 13d and the second annular surface 15d may be referred to as a friction surface Sp.

  As will be described later, when the first slider 13 and the second slider 15 transition between a sliding state and a non-sliding state, the rotary inertia adding device 3 is capable of the absolute coordinates of the seismic isolation structure A1. The transition is made between a state where an effect of suppressing acceleration in the system is expected and a state where an effect of suppressing displacement of the seismic isolation object A1 with respect to the support A2 is expected.

  Here, in general, the seismic isolation object A1 (building, house, PC rack, etc.) is designed so that the horizontal design seismic intensity (design horizontal seismic intensity) is appropriately set and can withstand the horizontal design seismic intensity. . The horizontal design seismic intensity is represented by the ratio of the horizontal load (acceleration in the horizontal direction) to the own weight (gravity acceleration) of the seismic isolation object A1, for example, the horizontal load corresponding to the own weight is represented by 1. The horizontal design seismic intensity is set in consideration of various circumstances such as the type of the seismic isolation object A1 and the area where the seismic isolation object A1 is installed, and is generally 0.2 to 0.4.

  In a state where the effect of suppressing the acceleration of the seismic isolation object A1 is expected (a state where the first slider 13 and the second slider 15 slide relative to each other), at least the vibration of the seismic isolation object A1 is equal to or greater than the horizontal design seismic intensity. Preferably it occurs when it occurs. In other words, the first slider 13 and the second slider 15 are preferably slidable when a vibration smaller than the horizontal design seismic intensity is generated in the seismic isolation object A1.

  Therefore, the coefficient of static friction between the first slider 13 and the second slider 15 is set taking into account design conditions such as the horizontal design seismic intensity of the seismic isolation object A1 and the number of rotary inertia adding devices 3 as appropriate. Is preferred.

  The coefficient of static friction between the first slider 13 and the second slider 15 is, for example, 0.3 or less. Preferably, the coefficient of static friction between the first slider 13 and the second slider 15 is a value (0.3 / 4 = 0) obtained by dividing 0.3 by the number of rotary inertia adding devices 3 (4 in the present embodiment). 0.075) or less. More preferably, the coefficient of static friction between the first slider 13 and the second slider 15 is a value obtained by dividing 0.2 by the number of rotary inertia adding devices 3 (4 in the present embodiment) (0.2 / 4 = 0.05) grade.

  When the static friction coefficient is set to such a value, the first slider 13 and the second slider 15 are generated when vibrations smaller than the horizontal design seismic intensity (of a general size) are generated in the seismic isolation object A1. Are expected to slide.

  In addition, the static friction coefficient of a metal is generally 0.4 or more in a dry state without oil. Lubricating oil or the like may be appropriately disposed between the first slider 13 and the second slider 15 in order to set the coefficient of static friction to an appropriate value. Further, the first slider 13 and the second slider 15 may be covered with an appropriate cover member so that dust or the like does not enter between the first slider 13 and the second slider 15.

  FIG. 4 is a top view for explaining the operation of the rotary inertia addition unit 1.

  Consider a case where the seismic isolation object A1 moves in the y direction (vertical direction in FIG. 4) with respect to the support structure A2 as indicated by an arrow y1. In other words, consider a case where the seismic isolation object A1 moves in a direction perpendicular to the two (3B, 3D) arms 7 of the four rotary inertia addition devices 3 with respect to the support structure A2.

  In this case, in the two rotary inertia addition devices 3B and 3D, the arm 7 receives the force in the moving direction (y direction) of the seismic isolation object A1 from the movable member 5 and rotates. At this time, since the moving direction (y direction) of the movable member 5 is different from the moving direction of the arm 7 (rotating direction around the rotation axis RA), the distance (circular tangent and circumference) due to the difference is different. ), The movable member 5 slides in the groove 7a with respect to the arm 7.

  On the other hand, in the rotation inertia addition devices 3A and 3C having the arm 7 along the moving direction of the seismic isolation object A1, the movable member 5 only moves along the groove 7a, and the arm 7 does not rotate.

  In the rotation inertia addition devices 3B and 3D in which the arm 7 rotates, the first slider 13 rotates as the arm 7 rotates. The acceleration of the rotation of the first slider 13 is proportional to the acceleration of the vibration of the seismic isolation object A1 with respect to the support structure A2.

  When the acceleration of the rotation of the first slider 13 is small, the first slider 13 and the second slider 15 do not slide, and the rotation of the first slider 13 is all transmitted to the second slider 15 via a frictional force. The Then, the rotation of the second slider 15 is transmitted to the rotating mass body 29 via the gear mechanism 27. As a result, the displacement of the seismic isolation object A1 relative to the support structure A2 is suppressed.

  On the other hand, when the acceleration of rotation of the first slider 13 is large, the first slider 13 and the second slider 15 slide. As a result, the acceleration in the absolute coordinate system of the seismic isolation object A1 is suppressed. Further, at least a part of the rotational energy of the first slider 13 is consumed by sliding.

  As described above, the first slider 13 and the second slider 15 switch between a state in which a relative displacement suppression effect is expected and a state in which an acceleration suppression effect is expected, according to the acceleration.

  After the end of vibration, the seismic isolation object A1 can stop at a position deviated from the position before vibration (origin) with respect to the support structure A2. That is, residual displacement can occur. For example, the seismic isolation object A1 stops at the position shown in FIG. 4 after vibration. Therefore, for example, a force is applied to the seismic isolation object A1 in the direction opposite to the arrow y1 to return the seismic isolation object A1 to the origin.

  At this time, the rotary inertia addition device 3 operates in the same manner as when the seismic isolation object A1 vibrates with respect to the support structure A2. However, since a static load is applied to the seismic isolation object A1, the rotary inertia adding device 3 operates in the same manner as when vibration with low acceleration occurs.

  That is, the first slider 13 and the second slider 15 do not slide, and the movement of the seismic isolation object A1 relative to the support structure A2 is converted into the rotation of the rotating mass body 29. Since the frictional resistance of the sliding surface 9a that supports the seismic isolation object A1 is low and the resistance generated by the rotating mass body 29 when rotating at a low acceleration is small, the seismic isolation object A1 is the origin with a small load. Returned to

  As described above, when the vibration acceleration of the seismic isolation object A1 with respect to the support structure A2 is large, the first slider 13 and the second slider 15 slide. Accordingly, the residual displacement of the seismic isolation object A1 can include the residual displacement of the first slider 13 and the second slider 15.

  However, in the above-described return operation to the origin, the residual displacement of the first slider 13 and the second slider 15 is not eliminated. The residual displacement of the seismic isolation object A1 caused by the sliding of the first slider 13 and the second slider 15 is also eliminated by moving the seismic isolation object A1 while rotating the rotating mass body 29. Further, since the first slider 13 and the second slider 15 are rotating members, no inconvenience arises even if the relative positions are different between before and after vibration.

  According to the first embodiment, the rotary inertia adding device 3 rotates relative inertia between the support structure A2 and the seismic isolation object A1 supported by the support structure A2 so as to be movable in the horizontal direction. Convert to motion. The rotation inertia addition device 3 has a rotation transmission mechanism (a combination of the movable member 5 and the arm 7). The rotation transmission mechanism includes an arm 7 (supported shaft support portion 7b) that is rotatably supported by the support structure A2 around the rotation axis RA, and a movable member 5 connected to the seismic isolation object A1. . Further, the rotation transmission mechanism is configured such that the movable member 5 has one radius with respect to the rotation axis RA with respect to the pivoted support part 7b with reference to the pivoted support part 7b (based on the rotational coordinate system fixed to the pivoted support part 7b). It is configured to be movable in the direction and not movable in the direction perpendicular to the radial direction. The rotary inertia adding device 3 includes a rotary mass body 29 that is pivotally supported by the support structure A2 and to which the rotation of the pivoted support portion 7b is transmitted. Further, the rotary inertia adding device 3 has a rotary friction mechanism (connector 9). The connector 9 is supported by the first slider 13 pivotally supported by the support structure A2, and is pivotally supported by the support structure A2. The connector 9 is slidable with the first slider 13 and generates a frictional force between the first slider 13 and the connector 9. And a second slider 15 to which the rotation of the first slider 13 is transmitted. Further, the connector 9 is provided on a rotation transmission path from the pivoted support 7 b to the rotating mass body 29.

  The rotation inertia addition device 3 allows the arm 7 to move while allowing relative vibration in any direction between the seismic isolation object A1 and the support structure A2 by a rotation transmission mechanism (a combination of the movable member 5 and the arm 7). Relative vibrations in directions other than the direction along can be converted into rotation. That is, the vibration with respect to the support structure A2 of the seismic isolation object A1 is efficiently converted into rotation of rotation inertia with a small configuration. Since the rotational friction mechanism (connector 9) changes the transmission rate of the efficiently converted rotation, it effectively performs both suppression of acceleration of the seismic isolation object A1 and suppression of relative displacement. Can do. Furthermore, as described above, the elimination of the residual displacement in the friction mechanism (connector 9) can be replaced with the rotation of the rotating mass body 29, and the return of the seismic isolation object A1 to the origin is facilitated.

  The first slider 13 is a member that supports the arm 7 and rotates with the arm 7 around the rotation axis RA. The second slider 15 is a member that supports the first slider 13. Therefore, the friction mechanism is configured by the member (connector 9) that supports the arm 7, and the configuration is simple.

  The first slider 13 and the second slider 15 are provided coaxially, and the friction surfaces Sp perpendicular to the rotation axis RA of the first slider 13 and the second slider 15 slide on each other. Therefore, for example, compared to a case where a frictional force is generated between a wheel and an axle inserted through the wheel, or a frictional force is generated between outer peripheral surfaces around the rotation axis of two wheels. (Note that these aspects are also included in the present invention), and various effects are produced. For example, since a load is applied in the axial direction to generate a frictional force, it is possible to withstand a large load with a small shaft diameter compared to a case where a load orthogonal to the shaft is applied. Moreover, it is easy to ensure a wide friction surface, and the pressure on the friction surface can be reduced to suppress wear on the friction surface.

  The seismic isolation object A1 is supported by the support structure A2 so as to be movable in the horizontal direction. The shaft support that supports the rotating mass body 29 and the like is the support structure A2, and the vibration body to which the movable member 5 is coupled is the seismic isolation object A1. The first slider 13 and the second slider 15 are provided between the support structure A2 and the seismic isolation object A1 with the rotation axis RA as the vertical direction, and at least a part of the load of the seismic isolation object A1 is used as the friction surface Sp. Is supported by.

  Therefore, it is easy to generate a frictional force proportional to the load of the seismic isolation object A1. The static friction coefficient is set so that sliding occurs in the first slider 13 and the second slider 15 when a horizontal load of about 20% of the load of the seismic isolation object A1 is applied to the seismic isolation object A1. It is confirmed by numerical analysis conducted by the inventor that this is preferable.

  The second slider 15 is supported by the support structure A2 and supports the first slider 13 by the friction surface Sp. The first slider 13 is in contact with the sliding surface A1a provided on the seismic isolation object A1 in a smaller area than the sliding surface A1a, and is horizontal with a resistance smaller than the frictional resistance of the friction surface Sp against the sliding surface A1a. The sliding surface 9a is movable in the direction, and the seismic isolation object A1 is supported by the sliding surface 9a. The sliding surface 9a is located on the friction surface Sp.

  Therefore, the load of the seismic isolation object A1 is directly and coaxially applied to the friction surface Sp. As a result, a frictional force proportional to the load of the seismic isolation object A1 can be stably exhibited.

  In another aspect, the rotational inertia addition device 3 of the first embodiment performs the relative inertia between the support structure A2 and the seismic isolation object A1 supported movably on the support structure A2. Convert to rotational motion. The rotary inertia adding device 3 includes a rotary mass body 29 that is pivotally supported by the support structure A2, is rotated by the movement of the seismic isolation object A1 with respect to the support structure A2, and a friction mechanism (connector 9). ing. The connector 9 is movable with respect to the support structure A2, and is supported by the support structure A2. The connector 9 is slidable with the first slider 13 and has a frictional force between the first slider 13 and the first slider 13. And a second slider 15 that rotates by being transmitted with the motion of the first slider 13. In addition, the connector 9 is configured to be slidable when a vibration smaller than the horizontal design seismic intensity of the seismic isolation object A1 occurs in the seismic isolation object A1.

  Therefore, in the middle of transmitting the motion to the rotating mass body 29, the motion transmission can be suppressed by sliding the connector 9, and the acceleration of the seismic isolation object A1 can be suppressed. Further, the transition between a state where a relative displacement suppression effect is expected (a state where the connector 9 does not slide) and a state where an acceleration suppression effect is expected (a state where the connector 9 slides) is a seismic isolation object. It is performed under appropriate conditions for the horizontal design seismic intensity of A1. Further, since sliding occurs in the rotating member (second slider 15) that transmits the rotation to the rotating mass body 29, it is possible to substitute for the rotation of the rotating mass body 29 to eliminate the residual displacement in the sliding.

  In addition, the fact that an unintended slip can occur in the rotating member provided in the transmission path of the motion from the seismic isolation object to the rotating mass body of the conventional seismic isolation device does not affect the concealment difficulty of the present invention. For example, in a conventional seismic isolation device, when a belt and a pulley are provided in a rotation transmission path (see JP-A-11-344073), the belt and the pulley can slip. However, such belts and pulleys are configured on the premise that they do not slip, and cannot slip when vibrations smaller than the horizontal design seismic intensity are generated in the seismic isolation object.

  Furthermore, in another aspect, the rotation inertia addition device 3 of the first embodiment is configured to perform relative movement between the support structure A2 and the seismic isolation object A1 that is movably supported by the support structure A2. Convert to rotational motion. The rotary inertia adding device 3 includes a rotary mass body 29 that is pivotally supported by the support structure A2, is rotated by the movement of the seismic isolation object A1 with respect to the support structure A2, and a friction mechanism (connector 9). ing. The connector 9 is movable with respect to the support structure A2, and is supported by the support structure A2. The connector 9 is slidable with the first slider 13 and has a frictional force between the first slider 13 and the first slider 13. And a second slider 15 that rotates by being transmitted with the motion of the first slider 13. Further, the connector 9 is provided in a motion transmission path from the seismic isolation object A <b> 1 to the rotating mass body 29. The coefficient of static friction between the first slider 13 and the second slider 15 is 0.3 or less.

  The static friction coefficient of the dried metal is generally 0.4 or more. Therefore, the static friction coefficient being 0.3 or less indicates that the first slider 13 and the second slider 15 are configured on the assumption that they slide. In other words, the fact that an unintended slip can occur in the rotating member provided in the transmission path of the motion from the seismic isolation object to the rotating mass body of the conventional seismic isolation device affects the difficulty of conceiving the present invention. do not do. For example, in a conventional seismic isolation device, when a belt and a pulley are provided in a rotation transmission path (see JP-A-11-344073), the belt and the pulley can slip. However, such belts and pulleys are configured on the assumption that they do not slip, and the friction coefficient cannot be 0.3 or less.

  In the present embodiment, the rotation is transmitted to the rotating mass body 29 via the rotating member (second slider 15) configured on the premise of sliding, so that the sliding is performed as described above. It is possible to suppress the acceleration of the seismic isolation object, and to replace the residual displacement due to the sliding with the rotation of the rotating mass body 29.

  A plurality of combinations of the rotating mass body 29 and the friction mechanism (connector 9) are provided for the support structure A2 and the seismic isolation object A1. In other words, a plurality of rotational inertia adding devices 3 are provided. The static friction coefficient in each rotary inertia adding device 3 is equal to or less than a value obtained by dividing 0.3 by the number of rotary inertia adding devices 3 (0.3 / 4 = 0.075 in this embodiment).

  In this case, the coefficient of static friction is 0.3 or less also in the plurality of rotation inertia adding devices 3 as a whole, and it is clear that the configuration is based on the assumption that sliding is performed.

  Further, if the static friction coefficient in each rotary inertia applying device 3 is about a value obtained by dividing 0.2 by the number of rotary inertia adding devices 3 (in this embodiment, 0.2 / 4 = 0.05), the seismic isolation is performed. When a horizontal load that is about 20% of the load of the object A1 is applied to the seismic isolation object A1, sliding occurs in the connector 9, and a preferred mode obtained by the present inventor based on numerical analysis Matches.

  In the above embodiment, the rotary inertia adding unit 1 and the rotary inertia adding device 3 are examples of the seismic isolation device, the support mechanism, and the rotary inertia adding device of the present invention, respectively. The seismic isolation object A1 is an example of the seismic isolation body and vibration body of the present invention. The support structure A2 is an example of a support body and a shaft support body of the present invention. The movable member 5 is an example of the vibration part of the present invention. The movable member 5 and the arm 7 are an example of the rotation transmission mechanism of the present invention. The connector 9 is an example of the rotational friction mechanism of the present invention. The sliding surface A1a is an example of a horizontal plane provided on the object of the present invention. The sliding surface 9a is an example of the contact portion of the present invention.

(Second Embodiment)
The technical idea of the present invention that replaces the elimination of the residual displacement in the friction mechanism with the rotation of the rotating mass body is that both the two sliders constituting the friction mechanism may not be rotating members, and only one of them is a rotating member. There may be. As an example, the following second embodiment will be described.

  FIGS. 5A and 5B are diagrams showing a rotary inertia adding device 103 according to a second embodiment of the present invention, FIG. 5A is a top view showing a part thereof omitted, FIG. 5B is a front view, FIG. 5 (c) is a side view. The rotation inertia adding device 103 not only has a function of converting the vibration of the seismic isolation object A1 into rotation of rotation inertia but also a function of supporting the seismic isolation object A1 so as to be movable in the horizontal direction with respect to the support structure A2 ( It also has a function of a support mechanism. That is, the rotary inertia adding device 103 may be regarded as a seismic isolation device.

  The rotary inertia adding device 103 includes a first slide mechanism 105 (FIGS. 5B and 5C) that supports the seismic isolation object A1 so as to be movable in the x-axis direction with respect to the support structure A2, A second slide mechanism 107 that supports the seismic object A1 so as to be movable in the y-axis direction with respect to the support structure A2, and a rotating device 109 that converts linear motion of the second slide mechanism 107 into rotational motion of rotational inertia. I have.

  As shown in FIGS. 5B and 5C, the first slide mechanism 105 includes a first seismic isolation side slide member 111 fixed to the seismic isolation object A1, and a first seismic isolation side slide member 111. And a first support side slide member 113 that is movable in the x-axis direction with respect to the first seismic isolation side slide member 111. These friction coefficients are set relatively low.

  The second slide mechanism 107 is provided so as to be stacked on the first slide mechanism 105, and a second seismic isolation side slide member 115 fixed to the first support side slide member 113 and a second seismic isolation side slide member 115. And a second support-side slide member 117 that supports the slidable member in the y-axis direction. These members can be relatively moved in the y-axis direction by providing balls or rollers between the members.

  For example, four rotating devices 109 are provided. Each rotating device 109 has an input rotating body 119 that rotates in contact with the second seismic isolation side slide member 115, a gear mechanism 121 that accelerates and transmits the rotation of the input rotating body 119, and an input rotation by the gear mechanism 121. And a rotating mass body 123 that rotates when the rotation of the body 119 is transmitted.

  The second seismic isolation side slide member 115 and the input rotating body 119 are in contact with each other with a predetermined load. The static friction coefficient between the second seismic isolation side slide member 115 and the input rotating body 119 is set to 0.3 or less, for example. That is, the second seismic isolation side slide member 115 and the input rotator 119 are configured on the assumption that they slide, and constitute a friction mechanism.

  When the second seismic isolation side slide member 115 vibrates at a relatively low acceleration relative to the second support side slide member 117, the second seismic isolation side slide member 115 and the input rotating body 119 do not slide, The input rotator 119 converts all the relative movement in the y-axis direction of the seismic isolation object A1 with respect to the support structure A2 into rotation. Then, the rotation is transmitted to the rotating mass body 123 via the gear mechanism 121, and the relative displacement of the seismic isolation object A1 is suppressed.

  On the other hand, when the second seismic isolation side slide member 115 vibrates at a relatively high acceleration with respect to the second support side slide member 117, the second seismic isolation side slide member 115 and the input rotating body 119 have a predetermined frictional force. It slides and the acceleration of seismic isolation object A1 is suppressed.

  When the second seismic isolation side slide member 115 and the input rotator 119 slide, a residual displacement occurs between these members, and as a result, a residual displacement of the seismic isolation object A1 with respect to the support structure A2 occurs. A relatively small static load is applied to the seismic isolation object A1, and the seismic isolation object A1 is returned to the origin while the rotating mass body 123 is rotated.

  According to the second embodiment described above, the same effects as those of the first embodiment can be obtained. That is, it is possible to substitute for the rotation of the rotating mass body 123 to eliminate the residual displacement in the friction mechanism (the second seismic isolation side slide member 115 and the input rotating body 119). As a result, the return of the seismic isolation object A1 to the origin is facilitated.

  In the second embodiment, the seismic isolation object A1 is an example of the seismic isolation body of the present invention, and the support structure A2 is an example of the support body of the present invention, but the seismic isolation object A1 can be moved. The first support-side slide member 113 that is supported by the support structure A2 and is movably supported by the support structure A2 may be regarded as the seismic isolation body of the present invention.

  The present invention is not limited to the above embodiment, and may be implemented in various aspects.

  A rotary inertia addition apparatus is not limited to what is used for a seismic isolation apparatus. Further, the relative movement between the object and the support that is converted into the rotation of the rotation inertia is not limited to the movement in the horizontal direction. Refer to Patent Document 1 for these aspects. Further, the rotary inertia adding device is not limited to the one that also serves as a support mechanism, and the support mechanism may be provided separately from the rotary inertia adding device.

  Axial support such as a rotating mass body may be made on an object (a seismic isolation body). In other words, the support may be a vibrating body and the seismic isolation body may be a shaft support.

  The rotation transmission mechanism is not limited to a combination of an arm and a movable member guided by the groove of the arm. For example, the present invention may be applied to various aspects exemplified in Patent Document 1.

  As described above, the friction mechanism may be appropriately configured as long as the member on the rotating mass body side among the two members sliding with each other is a rotating member. Further, when both of the two members are rotating members, the friction surface is not limited to a surface orthogonal to the rotation axis, and may be an outer peripheral surface or an inner peripheral surface around the rotation axis. The load of the base isolation body may be applied to the friction surface as in the first embodiment, or the load of the base isolation body may not be applied to the friction surface as in the second embodiment. Good.

  When the load of the base isolation body is applied to the friction surface, the contact portion (sliding surface 9a in the embodiment) that contacts the base isolation body of the friction mechanism is located on the friction surface (the friction surface Sp in the embodiment). It does not have to be. Further, the abutting portion is not limited to one that slides with respect to the horizontal plane (in the embodiment, the sliding surface A1a) with a low coefficient of friction. There may be.

  The static friction coefficient is generally larger than the dynamic friction coefficient. However, there are also materials such as a fluororesin having self-lubricating characteristics, in which the static friction coefficient and the dynamic friction coefficient are equal, or the static friction coefficient is smaller than the dynamic friction coefficient. In the friction mechanism, any material from these general materials to special materials may be used.

  Moreover, although the static friction coefficient of the friction mechanism is exemplified as 0.3 or less in the embodiment, it may be larger than 0.3. The static friction coefficient of the friction mechanism may be appropriately set in consideration of various conditions such as the horizontal design seismic intensity of the seismic isolation object, and as a result, the static friction coefficient of the friction mechanism is the friction coefficient of a general dry state. It doesn't matter if it gets bigger.

  DESCRIPTION OF SYMBOLS 3 ... Rotary inertia addition apparatus (seismic isolation device, bearing mechanism, rotation inertia addition apparatus), 5 ... Movable member (vibrated part), 7 ... Arm (supported part), 9 ... Connector (rotational friction mechanism, friction mechanism) DESCRIPTION OF SYMBOLS 13 ... 1st slider, 15 ... 2nd slider, 29 ... Rotating mass body, A1 ... Seismic isolation object (seismic isolation body, object, vibration body), A2 ... Support structure (support body, axial support body) , RA ... rotating shaft.

Claims (9)

A support mechanism for supporting the base isolation body movably in the horizontal direction with respect to the support;
A rotary inertia adding device that converts relative movement between the support and the base isolation body into a rotary motion of rotary inertia;
Have
The rotary inertia adding device is:
Connected to a shaft support that is rotatably supported around a predetermined rotation axis on a shaft support that is one of the support and the base isolation body, and a vibration body that is the other of the support and the base isolation body And the oscillated portion is movable with respect to the pivot support portion in one radial direction with respect to the pivot support portion, with respect to the pivot support portion, and in the radial direction. A rotation transmission mechanism configured to be immovable in an orthogonal direction;
A rotating mass body that is pivotally supported by the pivotal support and transmits the rotation of the pivoted support,
A first slider that is pivotally supported by the pivot support, and a first slider that is pivotally supported by the pivot support and is slidable with the first slider and through a frictional force between the first slider and the first slider. A second slider to which the rotation of the slider is transmitted, and a rotational friction mechanism provided in a rotation transmission path from the pivoted support portion to the rotating mass body;
Seismic isolation device. A rotary inertia addition device that converts a relative movement between a support and an object supported by the support so as to be movable into a rotary motion of rotary inertia,
The shaft support that is one of the support and the object is connected to a shaft support that is rotatably supported around a predetermined rotation axis, and a vibration body that is the other of the support and the object. A vibration part, wherein the vibration part is movable with respect to the pivot support part in one radial direction with respect to the rotation axis and orthogonal to the radial direction with respect to the pivot support part. A rotation transmission mechanism configured to be immovable in a direction;
A rotating mass body that is pivotally supported by the pivotal support and transmits the rotation of the pivoted support,
A first slider that is pivotally supported by the pivot support, and a first slider that is pivotally supported by the pivot support and is slidable with the first slider and through a frictional force between the first slider and the first slider. A second slider to which the rotation of the slider is transmitted, and a rotational friction mechanism provided in a rotation transmission path from the pivoted support portion to the rotating mass body;
Rotating inertia adding device. The first slider is a member that supports the pivoted support part and rotates together with the pivoted support part around a rotation axis of the pivoted support part,
The rotational inertia addition device according to claim 2, wherein the second slider is a member that pivotally supports the first slider. The rotary inertia addition apparatus according to claim 2 or 3, wherein the first and second sliders are provided coaxially, and friction surfaces perpendicular to the rotation axes of the first and second sliders slide relative to each other. The object is supported by the support so as to be movable in the horizontal direction,
The shaft support is the support;
The vibrator is the object,
The first and second sliders are provided between the support and the object with a rotation axis as a vertical direction, and support at least a part of the load of the object by the friction surface. 4. The rotary inertia adding device according to 4. The second slider is pivotally supported by the support and supports the first slider by the friction surface.
The first slider is in contact with a horizontal plane provided on the object in an area smaller than the horizontal plane, and is movable against the horizontal plane with a resistance smaller than the frictional resistance of the friction surface. Having a contact portion, supporting the object by the contact portion,
The rotational inertia addition device according to claim 5, wherein the contact portion is located on the friction surface. A rotary inertia addition device that converts a relative movement between a support and an object supported by the support so as to be movable into a rotary motion of rotary inertia,
A rotating mass body that is pivotally supported by a shaft support body that is one of the support body and the object, and that rotates by transmitting movement of the vibrating body that is the other of the support body and the object to the shaft support body;
A first slider that is movable relative to the shaft support, and is supported by the shaft support, is slidable with the first slider, and is frictionally coupled to the first slider. A second slider that rotates by transmitting the motion of one slider, and a friction mechanism provided in a motion transmission path from the vibrating body to the rotating mass body;
Have
The said friction mechanism is comprised so that sliding is possible when the vibration smaller than the horizontal design seismic intensity of the said target object has arisen in the said target object. A rotary inertia addition device that converts a relative movement between a support and an object supported by the support so as to be movable into a rotary motion of rotary inertia,
A rotating mass body that is pivotally supported by a shaft support body that is one of the support body and the object, and that rotates by transmitting movement of the vibrating body that is the other of the support body and the object to the shaft support body;
A first slider that is movable relative to the shaft support, and is supported by the shaft support, is slidable with the first slider, and is frictionally coupled to the first slider. A second slider that rotates by transmitting the motion of one slider, and a friction mechanism provided in a motion transmission path from the vibrating body to the rotating mass body;
Have
The rotary inertia addition apparatus, wherein a static friction coefficient between the first slider and the second slider is 0.3 or less. One or more combinations of the rotating mass body and the friction mechanism are provided for the support and the object,
The rotational inertia addition apparatus according to claim 8, wherein the static friction coefficient in each group is equal to or less than a value obtained by dividing 0.3 by the number of the combinations.

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