JPH041215B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is installed between equipment such as piping systems and structures in power plants, chemical plants, etc., and allows low acceleration displacement due to thermal expansion between the two. This invention relates to an improved inertial damping device that suppresses high-acceleration displacements caused by earthquakes, etc.

Conventionally, this type of vibration damping device converts the relative axial reciprocating motion during vibration between two support members connected to the damping target and the structure into the rotational motion of a rotating body, and is installed on this rotating body. In short, utilizing the inertia of an inertial body, such as by operating the braking body by the direct inertia of the inertial body or by differential rotation between the inertial body and the inertial body and bringing it into frictional engagement with one of the supporting members. It is known that vibration damping devices suppress the rotation of a rotating body to damp vibrations, and a speed increaser is incorporated between the rotating body and the inertial body of these vibration damping devices to cope with low cycle vibrations. It has been proposed to reduce the size of the inertial body and to reduce the size of the inertial body.

However, in the case of such a conventional vibration damping device with a speed increasing mechanism, the resistance increases depending on the multiplier of the speed increasing mechanism even for the slow change that should be allowed between the structure and the damping target. There is a problem that it will happen once.

The present invention was made by focusing on the problems of such conventional vibration damping devices, and it is possible to attach a planetary gear to a rotating body, and directly or indirectly attach a sun gear to an inertial body to convert this into a planetary gear. By meshing and rotatably providing an internal gear on the outside of these gears, the relative rotation between the rotating body and the internal gear due to inertia when the rotating body rotates at high acceleration causes speed-up operation. , aims to solve the above problems.

Embodiments of the invention will be described below with reference to the figures. The cylindrical main case 1, which is the first support member, has a large diameter portion 1a.
and a small diameter portion 1b. A handle 1d is provided on the outside of the main case large-diameter outer end lid 1c, through which it is connected to a vibration damping object such as a structure or piping system. The main case small-diameter portion 1b freely receives the cylindrical sub-case 2, which is a second support member, in the axial direction.

The sub-case 2 can be connected to a vibration damping object or structure via a handle 2a at the outer end, and is provided with a ball nut 3 at the inner end.

The threaded rod 4, which is a rotating body, is rotatably supported by the intermediate wall 1e in the main case 1 at its intermediate portion, and is received in the sub case 2 so as to be freely axially movable in and out of the sub case 2 with a nut 3 screwed on the outside. The threaded rod 4 has a mounting plate 5 at an end inside the large diameter portion 1a of the main case, and three planetary gears 6 are concentrically supported on the mounting plate 5.

The planetary gear 6 is connected to the main case large diameter portion 1 on the outside.
It meshes with an internal gear 7 that is rotatably provided in the interior of the shaft a, and also meshes with a sun gear 8 that is fixed to one end of the rotating shaft 9 inside.

The rotating shaft 9, which is a driven rotating body, has one end rotatably supported by the main case large-diameter lid 1c, and has a sun gear 8 meshing with the planetary gear 6 at the other end.
An inertial body 10 is fixed to an intermediate portion of the rotating shaft 9.

Next, the effect will be explained. This vibration damping device is used by connecting either the main case 1 or the sub case 2 to a vibration damping target such as a piping system, and the other to a structure.
Now, if a slow, low-acceleration displacement occurs between the damping target and the structure due to thermal deformation, main case 1
and the sub-case 2 move in and out relative to each other in the axial direction, and the ball nut 3 rotates the threaded rod 4. The planetary gear 6 revolves together with the threaded rod 4, and in conjunction with this, the internal gear 7 slowly rotates together. The sun gear 8 also rotates to rotate the rotating shaft 9 together with the inertial body 10. In this case, since the displacement is a low acceleration, the speed increasing mechanism does not operate. In this way, slow relative displacement between the damping target and the structure is easily tolerated.

On the other hand, when a relative displacement with high acceleration occurs between the structure and the damping target due to an earthquake, etc., the internal gear 7 cannot follow the rotation of the planetary gear 6 with high acceleration due to inertia, and there is a gap between the two. A relative rotation occurs. As a result, the planetary gear 6 rotates at high speed and attempts to rotate the rotating shaft 9 at an increased speed, but the inertial body 10 cannot follow this rotation due to inertia, resulting in a large resistance to rotation. This inertial resistance provides a damping effect.

The present invention is not limited to the embodiments described above. For example, a conventional vibration damping device of this type can be combined with another speed increaser to increase the speed in two stages. In this case, one of the speed increasers can be made to wait for its function as an inertial body.

Further, the present invention does not directly fix the inertial body 10 to the rotating shaft 9, but elastically connects the two, so that relative rotation occurs during high acceleration rotation, and this relative rotation causes various braking operations. The present invention can be applied to a known vibration damping device that utilizes inertial resistance.

Furthermore, contrary to the illustrated embodiment, the present invention can also be applied to a case where the threaded rod is fixed and the nut is a rotating body.

As explained above, according to the present invention, a differential gear speed increasing mechanism consisting of a planetary gear 6, an internal gear 7, and a sun gear 8 is used as a rotation speed increasing mechanism in a vibration damping device that utilizes inertia. , and because the internal gear 7 is rotatably incorporated, the internal gear 7 can
rotates integrally with the planetary gear 6 and does not increase the speed, so there is little resistance to displacement and no unreasonable force is applied to the vibration damping target. During high-acceleration displacement, the internal gear 7 is relatively fixed by inertia, causing a speed-increasing effect and equivalently increasing the mass of the inertial body 10. As a result, a small and lightweight vibration damping device with a large capacity is required. You can get the effect that you can.

[Brief explanation of drawings]

FIG. 1 is a sectional view, and FIG. 2 is a sectional view of FIG. 1. 1...Main case, 2...Sub-case, 3...Nut, 4...Threaded rod, 6...Planetary gear, 7...Internal gear, 8...Sun gear, 9...Rotating shaft, 10... …
Inertial body.

Claims (1)

[Claims] 1. A system that converts relative axial reciprocating motion between one support member connected to a vibration damping target and the other support member supported by a structure into rotational motion of a rotating body, and In an inertial vibration damping device that transmits the rotation of the rotor to a driven rotor and suppresses the rotation of the rotor by using the inertia of an inertia body connected directly or indirectly to the driven rotor, the rotor having a mounting member. A planetary gear is rotatably attached to this mounting member, a sun gear that meshes with the planetary gear is provided on the driven rotating body, and a sun gear that meshes with the planetary gear is provided on the outside of the planetary gear so as to rotate with respect to the rotating body when rotating at a predetermined high acceleration. An inertial vibration damping device with a speed increaser, characterized in that internal gears having inertia capable of relative rotation are provided so as to mesh with each other, and this relative rotation rotates a driven rotating body at an increased speed via a planetary gear and a sun gear. .