JPS5847583B2 - Vibration isolator - Google Patents

Description

[Detailed description of the invention] The present invention relates to a vibration isolator with damping characteristics.

Coil springs, rubber, and the like are used in normal vibration isolators, but the former has drawbacks such as difficulty in obtaining damping characteristics with hysteresis, and the latter has poor durability.

In addition, if a coil spring and a damper mechanism are used in combination to obtain damping characteristics, it not only requires a large space but also requires a lot of effort to maintain. is inappropriate.

The present invention has been made based on the above circumstances, and aims to provide good damping characteristics, require small space, require no trouble for maintenance, and is particularly suitable for applications with large load capacities. The purpose of this invention is to provide a vibration isolating device.

Hereinafter, the present invention will be explained with reference to an illustrated embodiment.

In FIG. 1, a box 1 includes a base plate 2 arranged at the lower end, a cylindrical main body 3 erected on the base plate 2, and a lid 4 detachably attached to the upper end of the main body 3. It is equipped with

The lid body 4 has a vertically extending through hole 5 formed in the center thereof.

An upper member 6 and a lower member 7 are housed inside the box 1 so as to be movable up and down.

The upper member 6 is approximately disk-shaped, and has a vertically extending through hole 8 formed in the center thereof, and an upper locking portion 9 provided at the peripheral edge of the through hole 8.

The upper member 6 has a plurality of (two in the figure) arranged at intervals in the circumferential direction.
A guide rod 10 (one shown) is erected downward.

The lower member 7 includes a cylinder 11 having a cylindrical shape with a bottom, a flange 12 attached to the outer wall of the cylinder 11, and a cylinder 1.
1, and a lower locking portion 13 attached to the inner wall of 1.

The flange portion 12 is formed with a plurality of through holes 14 into which the guide rods 10 are loosely inserted.

The lower locking part 13 has a vertical through hole 1 located in the center.
5 is formed.

A bottom portion 16 of the cylindrical body 11 faces the base plate 2 so as to be movable toward and away from the base plate 2.

The actuating member 17 includes a cylindrical portion 18 loosely inserted into the through hole 8 of the upper member 6 and the through hole 15 of the lower member 7, a connecting portion 19 disposed at the upper end of the cylindrical portion 18, and a connecting portion 19 disposed at the upper end of the cylindrical portion 18. A cylindrical upper engaging part 20 is screwed onto the outer circumferential part of the part 19 so as to be able to rise and fall freely, and a lower engaging part 2 is arranged at the lower end of the cylindrical part 18.
1, a bolt 22 that connects the connecting portion 19 and the lower engaging portion 21, and a pin 2 that is detachably attached to the connecting portion 19.
3.

The upper engaging part 20 loosely passes through the through hole 5 of the lid 4 and faces the upper locking part 9 from above so as to be able to come into contact with and separate from it.

The lower engaging portion 21 faces the lower locking portion 13 from below so as to be able to freely approach and separate from the lower engaging portion 21 .

A plurality of spring members 24 are interposed between the upper member 6 and the lower member 7 and spaced apart in the circumferential direction.

In the illustrated example, the spring member 24 includes a predetermined number of plate springs 25.
. . , and the guide rod 10 is inserted through the central through hole of these plate springs 25 .

Spring seats 26, 26 are arranged at both upper and lower ends of the spring member 24.

In addition, in the figure, 30 is a protection member, and in the illustrated example, it has a cylindrical shape and is attached to the upper member 6, but if necessary, it may be attached or placed on the lower member 7. The shape may be replaced with a cylindrical shape and a plurality of columns may be arranged in the circumferential direction.

By providing such a protection member 30, it is possible to prevent the spring member 24 from being damaged when an excessive load is applied.

The device configured as described above attaches the base plate 2 of the box 1 to an appropriate pedestal (not shown), and connects the connecting portion 19 and the supported body (not shown) via the pin 23. supports the supported body.

The load of the supported body is applied to the actuating member 17 (pin 23, connecting part 19
, upper engaging part 20), upper member 6 (upper locking part 9), spring member 24... (further spring 25...: lower member 7 (
Flange portion 12, cylinder body 11. Bottom part 16) Box body 1 (base plate 2
), etc., to the pedestal.

An appropriate initial load is applied to the spring members 24 in advance, but due to the static load of the supported body, the spring members 24...
When the upper member 6 and the actuating member 17 are lowered due to compression. The upper engaging part 20 is rotated to relatively raise the connecting part 19, and the lower engaging part 21 is adjusted so as to come into contact with the lower locking part 13.

When the device is in static equilibrium in this way, if a downward impact force is applied to the actuating member 11 due to some external force acting on the supported body, this impact force will be applied to the upper retaining portion 20 and the upper engagement member 11 as described above. It is transmitted to the spring members 24 by the upper member 6 via the stop portion 9, and the spring members 24 are compressed.

In this case, the lower engaging part 21 is separated from the lower locking part 13.

Further, when an upward impact force acts on the actuating member 17, this impact force is transmitted to the spring member 24 by the lower member 7 via the lower engaging part 21 and the lower locking part 13, and the spring member 24... ... is compressed.

In this case, the upper retaining part 20 is separated from the upper locking part 9.

On the other hand, as illustrated in FIG. 2, the counter spring 25 that supports the spring member 24 can be adjusted to a desired deflection (δ) per load (W) by appropriately setting the ratio between the height h and the thickness t. characteristics can be obtained.

Furthermore, by appropriately setting the shape and combination of the bellows springs, it is possible to create various hysteresis characteristics, as exemplified in FIG.

According to the above configuration, the spring members 24... are the actuating members 17
When moving relative to the box body 1 in either the upward or downward direction, it is always compressed, and this compression relieves the impact force.

In addition, since the spring member 24 includes a plurality of bell springs 25, the bell springs themselves have a hysteresis characteristic and have a damping effect. Since the damping effect is weighted, the impact energy is effectively absorbed.

Therefore, an effective damping effect can be achieved not only against impact force in one direction but also against vibration.

Furthermore, by appropriately setting the shape and combination of the plate springs 25, the spring member 24 can easily meet a wide range of requirements regarding load capacity and spring characteristics.

Furthermore, despite its large load capacity, it is small, and there is no need to provide a separate damper mechanism, so the space required can be small.

Note that the present invention is not limited to the above embodiments. For example, the design of the box body 1, the upper member 6, the lower member 7, the operating member 17, etc. can be changed as appropriate.

Further, the spring member 24 is not limited to a bell spring, but may be any one of various springs having damping characteristics such as a ring spring or a bamboo spring, or a combination of two or more thereof.

FIG. 4 shows the composite characteristics (solid line A) when the bellows springs 25 and ring springs 27 are combined in series as shown in FIG. It is shown together with the characteristics of only the ring spring (dashed line C).

In the figure, 29 is a spacer. FIG. 6 shows the composite characteristics (solid line A) when the bellows springs 25 and the bamboo shoot springs 28 are combined in series as shown in FIG. Shown with

FIGS. 8 and 10 show the waitability in the case of parallel combinations as shown in FIGS. 9 and 11, and the same symbols are given to corresponding parts as in FIGS. 4 to T.

When they are combined in parallel in this way, for example, in FIG. 9, the ring spring 27 may be arranged on the outside, or the plate spring 25 and the ring spring 2T may be arranged side by side instead of being arranged concentrically. You can do it like this.

By appropriately combining springs having mutually different characteristics as described above, the composite characteristics of the spring members 24 can be selectively set over a wider range.

As described above, the present invention has an upper and a lower member inserted into a box so as to be able to rise and fall, and an upper and a lower member that face the upper and lower locking portions of these upper and lower members so as to be movable toward and away from the upper and lower members, respectively. The actuating member includes an actuating member that has an engaging portion and is movable up and down, and a plurality of spring members that are located in the outer circumference of the actuating member and are interposed between the upper and lower members and have damping characteristics. The upward and downward impact forces acting relative to the box and the actuating member can be alleviated by compressive deformation of the spring member, and the impact energy can be effectively absorbed by the damping characteristics of the spring member.

Further, since the spring member can be used in selective combination of various spring elements having different spring characteristics and damping characteristics, it is possible to easily meet a wide range of demands for load capacity and overall characteristics.

Moreover, since the spring member has damping characteristics, there is no need to provide a separate damper mechanism, and the overall size is small and requires less space, and it is easy to maintain and has excellent durability, especially for bridges and buildings. It is suitable for large-capacity loads such as large mechanical devices.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing an embodiment of the present invention, Fig. 2 is an explanatory diagram illustrating the relationship between the shape of a bell spring and deflection-load characteristics, and Fig. 3 is a line illustrating the hysteresis characteristic of a bell spring. 4, 6, 8 and 10 are diagrams illustrating the hysteresis characteristics of the combination springs shown in cross section in FIGS. 5, 7, 9 and 11, respectively. be. 1...Box body, 5...Through hole. 6... Upper member, 7.
...Lower member, 9...Upper locking part, 13...Lower locking part, 17...Operating member, 19...Connection part, 20.
... Upper engaging part, 21... Lower engaging part, 24... Spring member, 25... Distal spring, 27... Ring spring, 28
...Bamboo spring.

Claims (1)

[Claims] 1 A box body attached to a pedestal, an upper member and a lower member inserted into this box body so as to be able to move up and down, and an upper locking portion of the upper member and a lower locking portion of the lower member, respectively. A lifting device having upper and lower engaging portions that face each other in a separable manner, and whose tip portion protrudes outward through a through hole formed in the upper end of the box body and is connected to a supported body. A vibration isolator comprising: a freely movable actuating member; and a plurality of spring members having damping characteristics, which are located on the outer circumference of the actuating member and are interposed between the upper and lower members.