JP7076899B2 - Spherical joint and damping device using this - Google Patents

Description

The present invention relates to a spherical joint used when a damping device such as a rotary inertial mass damper is attached to a structure such as a building.

As a damping device for quickly converging the vibration acting on the structure, as disclosed in Patent Document 1, a device using a ball screw device is known. This damping device has a rod having a spiral male screw and one end of which is connected to the structure, a nut member screwed to the rod, and a holding that rotatably supports and fixes the nut member to the structure. It includes a cylinder and a rotary weight that is given rotation by the nut member. The rod and the nut member constitute a ball screw device, and when the rod advances and retreats in the axial direction, the nut member rotates around the rod.

In such a damping device, when relative vibration generated in the structure due to an earthquake or the like is input between the rod and the holding cylinder, axial acceleration is generated in the rod along with the vibration, and this axial direction is generated. The acceleration is converted into the angular acceleration of the nut member screwed into the rod. The nut member and the rotary weight integrally form a rotating body, and the rotational torque generated in the rotating body is represented by the product of the moment of inertia of the rotating body and the angular acceleration. Then, this rotational torque is reversely converted by the nut member and the rod each time the axial acceleration of the rod is reversed, and acts as an axial reaction force on the rod.

A spherical joint is provided at one end of the rod in order to allow the attitude change of the damping device with respect to the structure, and the damping device is connected to the structure via the spherical joint. The spherical joint includes a ball portion provided at the end of the rod and a bracket that rotatably holds the ball portion and is fixed to the structure.

Further, in order to prevent the rod from being rotated by the rotational torque acting on the nut member, the spherical joint allows the precession movement of the rod while preventing the rotational movement around the axial direction. A stop mechanism is provided. This detent mechanism is composed of an elongated hole formed on the spherical surface of the ball portion along the axial direction of the rod, and a regulation bolt having a tip portion inserted into the elongated hole through the bracket. ing.

JP-A-2017-26074

However, the detent mechanism of the spherical joint disclosed in Patent Document 1 prevents the rod from rotating in the axial direction due to the interference between the elongated hole provided in the spherical surface of the ball portion and the restricting bolt. It was difficult to eliminate the gap between the slotted hole and the regulating bolt in the rotation direction of the rod. Therefore, there is a problem that the regulation bolt collides with the inner wall of the elongated hole every time the rotation direction of the nut member changes.

Further, when an unexpected excessive axial acceleration vibration acts on the rod in the event of a huge earthquake or the like, the rotating body rotates while maintaining a large angular momentum due to the vibration of the rod. Since the direction is reversed, there is a concern that an excessive rotational torque acts on the nut member and the rod, damaging these members.

The present invention has been made in view of such a problem, and an object of the present invention is that a damping device using a ball screw device can be easily connected to a structure, and a nut member. Further, it is an object of the present invention to provide a spherical joint capable of preventing such damage without applying an excessive torque to the screw shaft.

That is, the spherical joint of the present invention has a spherical portion in which one end of the shaft member is fixed, and a holder which has a concave curved surface fixed to the structure and slidably in contact with the spherical surface of the spherical portion to hold the spherical portion. It is provided with an annular detent member formed from an elastic body and provided between the spherical portion and the holder and pressed against both of them.

According to the spherical joint of the present invention, a damping device using a ball screw device can be easily connected to the structure, and the damping device is prevented from rotating around the axial direction to prevent the damping device. It is possible to fully demonstrate the function of the device. Further, it is possible to prevent an excessive torque from acting on the rod and nut members of the ball screw device constituting a part of the damping device, and it is possible to prevent damage to the damping device.

It is a schematic diagram which shows the mounting example of the damping device using the spherical joint of this invention. It is a perspective view which shows the 1st Embodiment of the damping device attached using the spherical joint of this invention. It is a perspective view which shows an example of embodiment of the spherical joint of this invention. It is sectional drawing of the main part which shows the detent member provided between a sphere part and a holder. It is a cross-sectional view of a main part which shows another example of the cross-sectional shape of the annular groove provided in a holder. It is a schematic diagram which shows the 2nd Embodiment of the damping device attached using the spherical joint of this invention.

Hereinafter, the spherical joint of the present invention will be described in detail with reference to the accompanying drawings, and the damping device that can be attached to the structure using the spherical joint will also be described in detail.

FIG. 1 shows an example of mounting an damping device using the spherical joint of the present invention on a structure. The damping device is a first connecting portion 10 and a first fixed to separate parts (first structure S1 and second structure S2) in the system including structures such as buildings, towers, bridges and the like. The two connecting portions 11 are provided. The system including the structure means to include the foundation ground to which the structure is fixed. For example, except when the damping device is arranged inside the structure, the first connecting portion 10 is attached to the structure. , The second connecting portion 11 includes the case where it is fixed to the foundation ground.

A spherical joint 2 is provided in each of the first connecting portion 10 fixed to the first structure S1 and the second connecting portion 11 fixed to the second structure S2. As a result, the damping device 1 can freely adjust the connection angle with respect to the first structure S1 and the second structure S2, and the first structure S1 and the second structure S2 can be freely adjusted. When a relative vibration acts between them, the damping device 1 expands and contracts between the first structure S1 and the second structure S2 in response to the vibration. In FIG. 1, a pair of spherical joints 2 are provided at both ends of the damping device 1 in the longitudinal direction. For example, the spherical joint 2 is provided only at one end in the longitudinal direction, and the other end is the first structure S1 or the first structure. It may be fixed directly to the second structure S2.

FIG. 2 is a perspective view showing a first embodiment of the damping device that can be attached to a structure using the spherical joint of the present invention, and is drawn by cutting out a part so that the internal structure can be grasped. The damping device 1 is a so-called rotary inertial mass damper, and has a fixed cylinder 12 having a hollow portion and formed in a cylindrical shape, and a spiral screw groove inserted into the hollow portion of the fixed cylinder 12 and having a spiral thread groove. The formed rod 13, the nut member 14 screwed into the thread groove of the rod 13 via a large number of balls, and the nut member 14 rotatably supported by the fixed cylinder 12 and coupled to the nut member 14. A cylindrical bearing housing 15, a cylindrical fly wheel 16 fixed to the bearing housing 15, and a rotor member rotatably supported by the fixed cylinder 12 and coupled to the fly wheel 16. It is equipped with 17.

A bearing (not shown) is provided between the fixed cylinder 12 and the bearing housing 15, and the bearing housing 15 is rotatably supported with respect to the fixed cylinder 12. Further, the nut member 14 is fixed to one end of the bearing housing 15 in the axial direction, and when the nut member 14 rotates, the bearing housing 15 rotates with respect to the fixed cylinder 12 together with the nut member 14. It is configured in.

The rod 13 and the nut member 14 form a so-called ball screw device. The nut member 14 has an infinite circulation path for the large number of balls, and these balls roll in a spiral thread groove formed in the rod 13. As a result, it is possible to mutually convert the linear motion in the axial direction and the rotational motion around the rod 13 between the rod 13 and the nut member 14, and it is possible to mutually convert the linear motion in the axial direction with respect to the rod 13. When a linear motion is applied, the nut member 14 causes a rotary motion around the rod 13, while when a rotary motion is applied to the nut member 14, the rod 13 causes a linear motion in the axial direction.

A cylindrical flywheel 16 is provided on the outside of the bearing housing 15. The flywheel 16 is fixed to the bearing housing 15 and is configured to rotate integrally with the nut member 14 and the bearing housing 15. Further, since the bearing housing 15 can freely rotate with respect to the fixed cylinder 12, the flywheel 16 can also freely rotate with respect to the fixed cylinder 12.

On the other hand, the rotor member 17 is provided around the fixed cylinder 12. The rotor member 17 is supported on the outer peripheral surface of the fixed cylinder 12 via a rotary bearing and is coupled to the flywheel 16 via an end plate 18, and the fixed cylinder is connected with the rotation of the flywheel 16. It is configured to rotate around twelve. The inner peripheral surface of the rotor member 17 faces the outer peripheral surface of the fixed cylinder 12 via a slight gap, and the gap is a closed space for the viscous fluid. Therefore, when the rotor member 17 rotates, a shear resistance force acts from the viscous fluid between the outer peripheral surface of the fixed cylinder and the inner peripheral surface of the rotor member, and the energy of the rotational movement of the rotor member 17 is attenuated. It has become like.

Then, in the damping device 1 of the first embodiment, when a relative vibration acts between the first structure S1 and the second structure S2, the rod 13 is shafted with respect to the fixed cylinder 12. The damping device 1 expands and contracts in the direction, and the flywheel 16 and the rotor member 17 repeatedly invert around the fixed cylinder 12. When the flywheel 16 is reversed, a large rotational torque is generated by the rotational inertia of the flywheel 16, and this rotational torque acts as a reaction force with respect to the axial movement of the rod 13. Further, a shearing resistance force acts from the viscous fluid on the rotation of the rotor member 17, and this shearing resistance force also acts as a reaction force on the axial movement of the rod 13. As a result, the vibration acting between the first structure S1 and the second structure S2 is damped by the rotational inertia mass damper.

FIG. 3 is a perspective view showing an example of a spherical joint to which the present invention is applied, and is drawn by cutting out a part in order to show the internal structure.

The spherical joint 2 encloses a spherical portion 21 having a through hole 20 into which a shaft member (not shown) fits, and the spherical surface of the spherical portion 21, and has a fixing bolt to form the first structure S1 or the second structure. It is provided with a holder 22 to be fastened to a structure such as the body S2. Further, the holder 22 includes a base member 23 having a bolt mounting hole 23a, and a lid member 24 fixed to the base member 23 and covering the spherical portion 21. An opening 24a is provided in the center of the lid member, and the shaft member is fitted into the through hole 20 of the spherical portion 21 through the opening 24a. The opening 24a limits the swing range of the shaft member with respect to the structure.

In this embodiment, the through hole 20 for fixing the shaft member is provided to the sphere portion 21, but the sphere portion and the shaft member are integrally formed without providing the through hole 20. A ball stud may be provided and the spherical portion of the ball stud may be wrapped in a holder.

Each of the base member 23 and the lid member 24 is provided with a concave curved surface on which the spherical surface of the spherical portion 21 is in sliding contact. When the base member 23 and the lid member 24 are integrated with a coupling bolt (not shown), the spherical portion 21 is sandwiched between the concave curved surface of the base member and the concave curved surface of the lid member 24, and the spherical portion 21 is placed in the holder 22. It is possible to rotate freely while being held.

A detent member 25 formed from an elastic body is provided between the spherical portion 21 and the holder 22. The detent member 25 is formed in an annular shape, is arranged in a plane orthogonal to an axis line penetrating the through hole 20 (indicated by a alternate long and short dash line in the figure), and surrounds the spherical portion 21. Further, the detent member 25 is provided corresponding to the equator of the sphere portion 21, that is, the maximum diameter portion of the sphere portion 21. The holder 22 is provided with an annular groove 26 for accommodating the detent member 25. The annular groove 26 is provided adjacent to the joint surface between the base member 23 and the lid member 24 in consideration of ease of formation, and the lid member 24 is fixed to the base member 23. , The annular groove 26 is formed.

In the specific example shown in FIG. 3, a single detent member 25 is provided near the equator of the sphere portion 21, but a plurality of detent members 25 are parallel to each other around the sphere portion 21. It can also be arranged so as to be.

FIG. 4 is a view showing a cross section of the detent member 25 arranged in the annular groove 26. The detent member 25 is crushed in the radial direction of the spherical portion 21 inside the annular groove 26, and is in pressure contact with both the spherical surface of the spherical portion 21 and the holder 22. As the detent member 25, for example, a commercially available O-ring can be used, and the thickness of the O-ring in that case is set to be larger than the depth of the annular groove 26.

The annular groove shown in FIG. 4 has a substantially rectangular cross-sectional shape, and the groove width of the annular groove 26 in a direction orthogonal to the circumferential direction of the detent member 25 (left-right direction on the paper surface in FIG. 4) is It is set to be larger than the thickness of the detent member 25. Therefore, a gap is formed between the inner wall of the annular groove 26 and the detent member 25, and when the spherical portion 21 rotates in the holder 22 in the arrow A direction, the detent member 25 is formed. It is taken around by the spherical portion 21 and can move slightly in the annular groove 26 in the A direction while being twisted.

Therefore, in the spherical joint 2, as shown in FIG. 3, it is possible to swing the axis line (indicated by the alternate long and short dash line in the figure) penetrating the through hole 20 of the spherical portion 21 in the direction of the arrow B. It is possible to connect the shaft member to the structure while allowing the precession of the shaft member fitted in the through hole.

On the other hand, since the detent member 25 formed in an annular shape is uniformly pressed against the spherical portion 21 and the holder 22 along the circumferential direction thereof, the spherical portion 21 is uniformly pressed in the arrow C direction shown in FIG. When the anti-rotation member 25 is to be rotated, a large frictional resistance force acts between the anti-rotation member 25 and the spherical portion 21, and between the anti-rotation member and the holder 22. Therefore, in the category of the frictional resistance force generated by the detent member 25, the spherical portion 21 cannot rotate in the arrow C direction with respect to the holder 22, and fits into the through hole 20 of the spherical portion. The rotation of the shaft member around the shaft is locked by the detent member 25.

The magnitude of the frictional resistance generated by the detent member 25 is determined by selecting the amount of crushing the detent member 25 inside the annular groove 26, the material of the detent member 25, and the thickness thereof. , Can be adjusted arbitrarily.

Further, in the specific example shown in FIG. 3, the detent member 25 is provided near the equator of the spherical portion 21 so that the detent member 25 can efficiently load the rotational torque in the arrow C direction. However, if the detent member 25 exerts a frictional resistance force of a sufficient size to lock the rotation of the sphere portion 21, it is necessary to provide the detent member 25 near the equator of the sphere portion 21. do not have.

When the damping device 1 is installed between the first structure S1 and the second structure S2 using the spherical joint 2, the shaft end of the rod 13 or the shaft end of the fixed cylinder 12 is used as the shaft end. Fit into the through hole of the spherical part.

As shown in FIG. 1, when the above-mentioned damping device 1 is installed between the first structure S1 and the second structure S2 using a pair of spherical joints 2, the first structure S1 and the first structure S1 are installed. When a relative vibration acts between the two structures S2, the rod 13 causes a translational motion in the axial direction with respect to the fixed cylinder 12. A rotational torque acts on the nut member 14 screwed to the rod 13 with this translational motion, and as a reaction thereof, the rotational torque acting on the nut member 14 is the same as that of the rod 13. The rotational torque in the opposite direction acts.

At this time, the spherical joint 2 allows the precession of the rod 13 or the fixed cylinder 12 while locking the rotation of the rod 13 or the fixed cylinder 12 around the axis, so that the nut member 14 can be used. Rotation will occur according to the amount of movement of the rod due to the translational motion. As a result, in the damping device 1, rotation is transmitted from the nut member 14 to the flywheel 16 and the rotor member 17, and the vibration of the second structure S2 with respect to the first structure S1 is forcibly damped.

On the other hand, when the rotational torque acting on the nut member 14 is excessive and exceeds the range of the frictional resistance force generated by the detent member 25, the rod 13 or the fixed cylinder 12 is the spherical portion. Since rotation occurs with respect to the holder 22 together with 21, the nut member 14 does not rotate according to the amount of movement of the rod 13, and the flywheel 16 and the rotor member with respect to the fixed cylinder 12 do not occur. The rotation of 17 is suppressed.

For example, when an unexpected huge earthquake occurs and an excessive speed or acceleration vibration is input to the damping device 1, the flywheel 16 and the rotor member 17 rotate in a state of maintaining a large angular momentum. Is repeatedly reversed, so there is a concern that the damping device 1 may be damaged. In this regard, if the damping device is connected to the first structure and the second structure by using the spherical joint 2, the nut can be used according to the magnitude of the frictional resistance generated by the detent member 25. Since the rotation of the member 14 is suppressed, it is possible to prevent such damage to the damping device 1.

FIG. 5 shows another example of the cross-sectional shape of the annular groove, in which the detent member 25 is housed in the annular groove 26a formed in a substantially V shape. The point that the detent member 25 is crushed and elastically deformed inside the annular groove 26a is the same as the substantially rectangular annular groove 26 shown in FIG.

When the detent member 25 is arranged inside the annular groove 26a having a substantially V-shaped cross section, even if the spherical portion 21 is rotated in the direction of the arrow A in FIG. 5, the annular groove 26 has a substantially rectangular cross section. As compared with the above, the detent member is less likely to rotate in the A direction, and the rotation of the spherical portion 21 is suppressed. Therefore, the range of the precession of the rod 13 fitted in the through hole 20 of the spherical portion 21 with respect to the first structure S1 or the precession of the fixed cylinder 12 with respect to the second structure S2. Is smaller than that of the annular groove 26 having a substantially rectangular cross section.

FIG. 6 is a cross-sectional view showing a second embodiment of the damping device that can be attached to a structure using the spherical joint of the present invention.

This damping device 3 shows a damping device using a ball screw device as in the damping device 1 shown in FIG. 2, but does not have the flywheel 16 as described above, and has only the shear resistance force due to the viscous fluid. Damping the vibration acting between the first structure S1 and the second structure S2 is performed. The damping device 3 is formed in a cylindrical shape having a rod 31 having a male screw on the outer peripheral surface and having one end in the axial direction connected to the first structure S1 via the spherical joint 2, and a hollow portion. A fixed cylinder 32 connected to the second structure S2 via the spherical joint, and a nut screwed into the male screw of the rod 31 via a large number of balls and rotatably supported by the fixed cylinder. It includes a member 33 and a cylindrical rotor member 34 that is housed in the hollow portion of the fixed cylinder 32 and has the nut member 33 fixed to one end in the axial direction.

When the rod 31 advances and retreats in the axial direction with respect to the nut member 33 due to the vibration acting between the first structure S1 and the second structure S2, the nut member 33 becomes the rod member. The axial motion of 31 is converted into rotary motion, and the rotor member 34 fixed to the nut member 33 is repeatedly inverted with the rotational motion of the nut member 33.

The gap between the inner peripheral surface of the fixed cylinder 32 and the outer peripheral surface of the rotor member 34 is a viscous fluid accommodating chamber 35, and when the rotor member 34 rotates, the inner peripheral surface of the fixed cylinder 32 and the said. Shear resistance acts from the viscous fluid between the rotor member 34 and the outer peripheral surface. Since this shear resistance force acts as a reaction force with respect to the axial movement of the rod 31, the vibration acting between the first structure S1 and the second structure S2 is damped by the damping device 3. ..

Also in the damping device of the second embodiment, the performance of the damping device using the ball screw device can be improved by connecting to the first structure S1 and the second structure S2 by using the spherical joint 2. It is possible to fully exert the effect and prevent damage to the damping device due to a large earthquake.

1 ... Damping device, 13 ... Rod, 14 ... Nut member, 2 ... Spherical joint, 21 ... Sphere part, 22 ... Holder, 25 ... Anti-rotation member, 26 ... Circular groove

Claims (6)

A spherical part to which one end of the shaft member is fixed,
A holder that is fixed to the structure and has a concave curved surface that is in sliding contact with the spherical surface of the spherical surface to hold the spherical surface.
An annular detent member formed from an elastic body and provided between the spherical portion and the holder and pressed against both of them is provided.
The holder has an annular groove for accommodating the detent member, and the annular groove is arranged in a plane orthogonal to the axis of the shaft member.
A spherical joint characterized in that the groove width of the annular groove is set to be larger than the thickness of the detent member, and a gap is provided between the inner wall of the annular groove and the detent member . The spherical joint according to claim 1 , wherein the annular groove is provided corresponding to the equator of the spherical portion . The spherical joint according to claim 1, wherein the spherical portion has a through hole into which the shaft member is fitted. The spherical joint according to claim 1, wherein the spherical portion is provided integrally with the shaft member to form a ball stud. A rod in which a spiral thread groove is formed on the outer peripheral surface and at least one shaft end is connected to the first structure.
A fixed cylinder having a hollow portion connected to the second structure and into which the rod is inserted,
A nut member that is screwed into the thread groove of the rod, is rotatably held with respect to the fixed cylinder, and reciprocates in response to vibration of the second structure with respect to the first structure.
A rotor member that is fixed to the nut member and forms a storage chamber for a viscous fluid between the fixing cylinder and the rotor member.
A pair of spherical joints provided between the rod and the first structure and between the fixed cylinder and the second structure.
Each of the pair of spherical joints
A spherical portion to which one end of the rod or the fixing cylinder is fixed,
A holder that is fixed to the first structure or the second structure and has a concave curved surface that is in sliding contact with the spherical surface of the spherical surface to hold the spherical surface.
An annular detent member formed from an elastic body and provided between the spherical portion and the holder and pressed against both of them is provided.
The holder has an annular groove for accommodating the detent member, and the annular groove is arranged in a plane orthogonal to the axis of the shaft member.
A damping device characterized in that the groove width of the annular groove is set to be larger than the thickness of the detent member, and a gap is provided between the inner wall of the annular groove and the detent member . A rod in which a spiral thread groove is formed on the outer peripheral surface and at least one shaft end is connected to the first structure.
A fixed cylinder having a hollow portion connected to the second structure and into which the rod is inserted,
A nut member that is screwed into the thread groove of the rod, is rotatably held with respect to the fixed cylinder, and reciprocates in response to vibration of the second structure with respect to the first structure.
A flywheel that is fixed to the nut member and rotates together with the nut member,
A pair of spherical joints provided between the rod and the first structure and between the fixed cylinder and the second structure.
Each of the pair of spherical joints has a spherical portion to which one end of the rod or the fixing cylinder is fixed, and a spherical portion.
A holder that is fixed to the first structure or the second structure and has a concave curved surface that is in sliding contact with the spherical surface of the spherical surface to hold the spherical surface.
An annular detent member formed from an elastic body and provided between the spherical portion and the holder and pressed against both of them is provided.
The holder has an annular groove for accommodating the detent member, and the annular groove is arranged in a plane orthogonal to the axis of the shaft member.
A damping device characterized in that the groove width of the annular groove is set to be larger than the thickness of the detent member, and a gap is provided between the inner wall of the annular groove and the detent member .

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