JPS6015960Y2 - Vibration damper - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a vibration damper for preventing shaking in a vibration isolating device that is composed of an air spring and a frame such as an inertia block that is elastically supported by the air spring.

In a vibration isolator that uses an elastic body such as an air spring to elastically support a frame such as an inertia block to prevent vibration, since air springs have little damping, it is not necessary to add a damping element separately. is necessary.

However, in this case, since the pedestal only makes a minute displacement, it is not appropriate to use a conventional oil damper or the like as the damping element, and it is more convenient to use Coulomb friction.

As one proposal, it is already known to arrange friction materials vertically on all sides of the frame and press them horizontally with air springs.

That is, the friction material is restrained vertically and horizontally with respect to the frame, and the friction material is pressed by an air spring so that it can only move in the axial direction.

'However, in this method, the inertia block performs a rocking motion, or
In the case of yawing, the friction material hits one side, and in particular, in the case of rolling, there is a disadvantage that only half of the friction material acts effectively and the other half does not.

The object of the present invention is to obtain a new vibration damper for a vibration isolator that does not have the above-mentioned drawbacks of conventionally known dampers.

In the present invention, in order to achieve this objective distantly, several shearing drums are suspended from the bottom surface of the pedestal, and each drum is surrounded by a fixedly placed donut-shaped air spring. It is characterized in that it is held down from all around by tightening with a spring, thereby providing a damping effect.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to FIGS. 1 to 9 of the accompanying drawings showing embodiments thereof.

Fig. 1 is a schematic diagram showing an example of a vibration isolator equipped with a vibration damper according to the present invention. is supported by a required number of elastic bodies 2 such as air springs.

These elastic bodies 2 are mounted directly on the external foundation 3 or via a separate platform as necessary, and are designed to transmit vibrations generated on the pedestal or inertia block 1 to the ground. absorb into.

Note that such a type of vibration isolator is already known.

However, in this vibration isolator, the vibration from the pedestal 1 is absorbed by the elastic body 2 such as an air spring, so the pedestal or inertia block 1 has the following characteristics: Z, y, x, as shown in FIG. Displacements in each direction and rotational displacements in each of 77 directions of θ, φ, and φ about the respective axes occur.

Therefore, in order to reduce this displacement and rotational displacement, a vibration damper as described above, specifically as shown in FIG. 3, has already been proposed.

That is, in this vibration damper, the side surface of the frame or the inertia block 5 is pressed by the air spring 7 via the friction plate 6, and the guide 8 is attached to the air spring 7, and the guide 8 is attached to the upper and lower sides of the air spring 7. and is surrounded by receivers 9 on the left and right sides, whereby the air spring 7 is guided so that it can be displaced in the axial direction but not in the vertical and horizontal directions.

Note that the friction plate 6 is fixed to the pedestal 5 or the guide 8, and
The receiver 9 is fixed to the foundation 10.

In this way, by adjusting the supply of air from the air pipe 11 to the air spring 7, the pressing force between the friction plate 6 and the side surface of the pedestal 5 or the guide 8 can be adjusted appropriately, and the pressure can be optimized. The idea is to create a frictional force between them.

In addition, when the excitation force acts in only two directions (see Fig. 2), this device can be used by installing four pieces in total, two on each side of the inertia block 5 in rows. The purpose can be distantly related, but in the middle, x, y, z
In order to generate excitation forces in the three directions, it is necessary to attach a total of eight pieces to other measurement surfaces as well, so a minimum of eight pieces in total need to be attached.

In contrast to this, the present invention, as shown by reference numeral 4 in Fig. 1, is to arrange four sets in principle near the periphery between the pedestal 1 and the external foundation 3 (only 7, as shown in the figure). (only two sets are shown).

Next, the details will be explained with reference to FIG.

As shown in FIG. 4, the vibration damper 4 according to the present invention includes a pedestal,
Alternatively, it stands apart from the shearing drum 20, which is vertically attached to the lower surface of the inertia block 1, and the donut-shaped air spring 21 surrounding it.

The drum 20 is attached to the pedestal 1 via a stand 22, but it is also possible to integrate the stand 22 and the sliding drum 20.

Furthermore, several friction plates 23 are vertically arranged at equal intervals between the outer periphery of the shearing drum 20 and the inner periphery of the air spring 21. 2
1 is pressurized, the friction plate 23 presses the shearing drum 20 from its outer periphery via this (fifth
figure).

In this way, in order to apply pressure by the friction plate 23 in several parts in the circumferential direction of the shearing drum 20, each friction plate 23 is arranged in several pieces on the outer periphery of the shearing drum 20. Attach these metal fittings 2 to each of the metal fittings 24
4 is pressed from its outer periphery via a doughnut-shaped air spring 21.

The metal fitting 24 transfers the heat generated by the shearing motion to the air spring 2.
It has a hollow structure so as to make it difficult to transmit heat to the air spring 21, and protect the air spring 21 from heat.

Also, above and below each metal fitting 24, annular receivers are arranged with metal fittings 25 and 26.
The sliding movement of the metal fittings 24 in the radial direction is also inhibited by each support rod 28 that is fixed to a cylindrical support metal fitting 27 arranged on the outer periphery of the metal fitting 24 and loosely penetrates each metal fitting 24 in the vertical direction. The bracket firmly connects the metal fittings 25 and 26.

Note that the lower support metal fitting 26 is fixed on the outer foundation 3.

Furthermore, each metal fitting 24 is equipped with rubbing plates 29 and 29' having a small friction coefficient on the upper and lower surfaces.
4 can slide only in the radial direction via the toroidal air spring 21 smoothly and without heat generation.

Note that the air spring 21 has a cylindrical support fitting 2 on its outer periphery.
7 so that it is fixed to the outer foundation 3, and the pressing force is applied to the supply port 3 which passes through the support fitting 27 and is connected to the air spring 23.
It is possible to make appropriate adjustments by supplying air from zero.

The vibration damper according to the present invention has been described above as an embodiment in which the shearing drum 20 is fixedly attached to the pedestal 1 via the stand 22. The shearing drum 20 can also be attached to a frame or the inertia block 1 via an elastic body.

FIG. 6 shows such an embodiment. In this case, several sets of shearing drums 20 are installed between the pedestal or the stand 22 attached to the lower surface of the inertia block 1 and the shearing drum 20. The anti-vibration rubber 40 is attached as appropriate, the arm 41 is attached to the stand 22, the spherical bearing 42 is attached to this arm 41, and the shaft 43 attached to this spherical bearing 42 is rotated via a pair of bearings 44. It is attached to the drum 20.

The vibration damper according to the present invention has the above-mentioned configuration.Next, the operation and effects of the vibration damper applied to a vibration isolator as shown in FIG. 1 will be explained.

FIG. 7 shows the frame 1 in the coordinate system shown in FIG.
In this case, the damper 4 of the present invention acts as an air splash.

This also applies to the case of the X direction where the direction is changed by 90°.

On the other hand, in the case of two-direction angle, the vibration isolating air spring 2 attached to the base or the lower part of the inertia shab 1 acts in the vertical direction, and the vibration damper 4 is displaced in the vertical direction. Therefore, the vibration damping effect is exerted by the shearing motion between the shearing drum 20 and the friction plate 23.

On the other hand, when a total of eight air springs 7, two on each opposing surface, are installed in the conventional method in which the air springs 7 act only in one axial direction, as explained above with reference to FIG. For example, when there is a displacement in the y direction, the damper in the y direction acts as an air spring, but the damper in the x direction acts as an air spring.
Performs vibration damping action.

This is the same even in the case of displacement in the X direction where the direction is changed by 90°, and the vibration suppressor according to the present invention performs almost the same effect.

Next, the case of rotational motion around each axis will be explained.

FIG. 8 shows rotation around the X axis. In this case, this rotational movement is a displacement of the damper 4 in the y direction, a displacement in two directions, and a rotational displacement around the X axis at the mounting position of the damper 4, that is, as seen in FIG. This is replaced by a rotational displacement in which the right side of the shearing drum 20 shown in the figure moves downward (or upward) with respect to its central axis.

Due to this rotational displacement, when the right side of the vibration damper 4 is displaced downward (or upward) with respect to the central axis of the shearing drum 20 as described above, the left side is displaced upward (or downward). becomes.

Therefore, by arranging the pedestal 1 and the vibration suppressor 4 as shown in FIG. 6, the rotational displacement around the X-axis is escaped by the spherical bearing 42 shown in FIG. The device 4 acts as an air spring, and at the same time, the friction plate 23 presses the outer periphery of the shearing drum 20 against displacement in two directions, thereby exerting a damping effect.

That is, the spring action and vibration damping action can be performed without difficulty as a whole.

This also applies to rotational movement around the y-axis.

On the other hand, in the case of the conventional method shown in FIG. 3, as shown in FIG.
' performs a damping effect, but the damper in the X direction has no escape other than the backlash of the main body, which causes problems.

This can be considered to be the same in the case of rotational movement around the y-axis.

Finally, the case of rotational movement around the Z axis as shown in FIG. 9 will be explained.

In this case, it is clear from the previous description of FIG. 8 that the vibration damper 4 according to the invention acts entirely as an air spring.

However, in this case as well, it is clear that the conventional vibration damper causes problems because the surface that the friction plate contacts loses its parallelism with the friction plate.

As described above, the vibration damper of the present invention includes a cylindrical shearing drum that is attached to the bottom surface of the mount, a friction plate that is divided and placed on the outer periphery of the drum, and a vibration damper that surrounds the friction plate. The vibration damper stands apart from the donut-shaped air spring fixed to the outside foundation, so when vertical displacement is applied to the pedestal, the damper will move between the shearing drum and the friction plate. When a horizontal displacement is applied to the pedestal, the damper acts as an air spring in that direction, and when a rotational displacement about the horizontal axis is applied, the damper acts as an air spring in that direction. In this case, the rotational displacement around the axis is relieved by a spherical bearing, etc., which may be installed separately between the pedestal and the external foundation, and the rotational displacement in the horizontal direction perpendicular to the rotational displacement caused by this rotational displacement is relieved. The displacement is damped by the damper acting as an air spring, and the accompanying vertical displacement is damped by the shearing motion between the friction plate and the sliding drum. When the frame performs rotational displacement around a vertical axis, all vibration dampers act as air springs to damp vibrations.
In this way, it can be seen that displacement in the vertical direction is impossible and that vibration damping can be effectively applied to all rotational movements.

This point is one of the major features that is fundamentally different from conventional types of vibration dampers.

Another major feature is that the present invention allows four dampers to perform the same function, whereas conventionally eight dampers were required.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of a vibration isolator equipped with a vibration damper according to the present invention, Fig. 2 is an explanatory diagram of movement of a frame or inertia block, Fig. 3 is a side view of a conventional vibration damper, and Fig. 4 is an explanatory diagram of a vibration isolator equipped with a damper according to the present invention. FIG. 5 is a cross-sectional view of one embodiment of the vibration suppressor according to the present invention, and FIG. 5 is a cross-sectional view thereof taken along the line ■-v. FIG. FIG. 7 is an explanatory diagram of the displacement of the frame or the inertia block in the y direction, FIG. 8 is an explanatory diagram of the movement around the X axis, and FIG. 9 is an explanatory diagram of the movement around the z axis. 1... Frame, 2... Air spring, 3...
Magai foundation, 20...Shuyuu drum, 21...
...Doughnut-shaped air spring, 22...stand, 2
3...Curved friction plate, 24...Curved middle chamber shaped metal fitting, 25.26
...The annular tube is a metal fitting, 27...Cylindrical support fitting, 29.29'...A rubbing plate, 40...
... Anti-vibration rubber, 41 ... Arm, 42 ...
...Spherical bearing.

Claims (1)

[Scope of utility model registration request] In a vibration isolating device composed of a pedestal 1, an external foundation 3, and several sets of air springs 2 interposed between them, the pedestal 1
A cylindrical shearing drum 20 that is attached to the lower surface of the drum, and a friction plate 23 that is divided and arranged around the outer circumference of the drum 20.
and a donut-shaped air spring 21 fixed to the outer foundation 3 so as to surround the friction plate 23.