JP2002242986A - Vibration reducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration reducing device capable of installing an impact damper without deteriorating vibration reducing effect even for a matter of a flat and standing up shape. SOLUTION: In a vibration reducing device having a plumb 13 housed with maintaining a gap from a inner surface of a housing part of a housing 12, a sliding means 15 is interposed between the plumb 13 and the inner wall of the housing part of the housing 12 subjected to weight of the plumb 13 to make a relative movement of the plumb 13 to the housing 12 smooth.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration reduction device (a so-called impact damper) in which a weight is stored with a clearance from an inner surface of a housing portion of a housing.

[0002]

2. Description of the Related Art For example, a dynamic damper is provided for preventing vibration of a seat back of an automobile to attenuate the vibration of the seat back. In a flat shape, such as a seat back, which is erected at a nearly vertical angle, a dynamic damper, in which a weight is supported via an elastic body, is adopted because it is easy to mount the interior.

[0003] However, the dynamic damper requires a weight having a certain mass and has a vibration damping effect for resonance at a specific frequency, but it is not expected to have a vibration damping effect for a plurality of resonance frequencies. Can not.

On the other hand, in the impact damper, when a vibration is input, the weight is displaced with respect to the housing and abuts against the inner surface of the housing, and the vibration is attenuated based on sliding friction at that time and energy loss due to collision. Therefore, a vibration damping effect can be obtained with a weight having a small mass for a plurality of resonances in a wide frequency range.

[0005]

Therefore, it is conceivable to use an impact damper also for the seat back.
In many cases, the weight of the impact damper is covered with an elastic body, and the elastic body collides against the inner surface of the housing of the housing.

Therefore, when the impact damper is mounted inside a flat and upright shape, the weight stored in the housing is supported in contact with the inner surface of the storage portion via the coated elastic body, so that the weight to the housing is weighted. The free and smooth movement is hindered, making it difficult to function as an impact damper.

[0007] The present invention has been made in view of such a point,
The target place is a flat and standing shape,
An object of the present invention is to provide a vibration reduction device that can house an impact damper without impairing the vibration reduction effect.

[0008]

In order to achieve the above object, according to the first aspect of the present invention, there is provided a vibration reducing apparatus in which a weight is accommodated with a gap with respect to an inner surface of an accommodation section of a housing. In the apparatus, a sliding means is interposed between the weight and the inner surface of the housing portion to which the weight of the weight is applied, and a vibration reducing device is provided for smoothing the relative movement of the weight with respect to the housing.

[0009] Even if the weight is installed inside a flat and upright shape, sliding means is interposed between the weight and the inner surface of the housing where the weight of the weight is added, so that the weight can be relatively moved relative to the housing. Therefore, a vibration damping effect can be obtained with a weight having a small mass for a plurality of resonances in a wide frequency range without impairing the vibration reducing effect as an impact damper.

According to a second aspect of the present invention, there is provided a vibration reducing device in which a weight is stored with a gap with respect to an inner surface of a housing portion of a housing, wherein the weight stored in the housing portion of the housing is suspended by a wire. A vibration reduction device for smoothing relative movement of the weight with respect to the housing.

Since the weight is suspended by the wire in the storage portion, the relative movement of the weight with respect to the housing can be smoothly performed, and the function as the impact damper can be sufficiently performed.

According to a third aspect of the present invention, there is provided the vibration reducing device according to the first or fifth aspect, wherein the outer surface of the weight has irregularities, and the irregularities which are loosely fitted to the irregularities of the weight are mutually different. It is a vibration reduction device formed on the inner surface of the housing section of the housing.

When the vibration is input, the weight is relatively displaced with respect to the housing, and the weight contacts the inner surface of the housing portion of the housing. Since they are loosely fitted, the contact area is larger than when they simply contact each other, so that the sliding friction and the energy loss due to collision are large, and a large vibration damping effect can be expected as an impact damper.

Further, since the contact area is large, it is advantageous for durability and tuning of characteristics, and furthermore, it is possible to reduce the labor for production and installation as compared with installing many separate impact dampers.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment according to the present invention will be described with reference to FIGS. The vibration reduction device according to the first embodiment is provided inside a seat back 4 of a seat 1 of a vehicle.

The seat 3 mounted on the seat rail 2
The seat back 4 is erected from the rear edge of the seat back, and the inclination angle of the seat back 4 can be freely adjusted, but is usually set to an angle close to vertical. An impact damper 11 is installed as a vibration reduction device in the seatback 4 which is used in a substantially rectangular flat shape and standing upright.

When the vehicle is running, mainly vibration in the left-right direction and vibration in the front-rear direction are input to the seat back 4, and the upper end vibrates with a large amplitude due to resonance about the lower end where the seat back 4 is mounted. easy. Therefore, the impact damper 11 is integrally fixed to the upper part of the seat back 4.

The structure of the impact damper 11 will be described with reference to FIGS. The housing 12 has a vertically long, flat rectangular rectangular parallelepiped outer shape, and its storage portion 12a also has a flat rectangular rectangular parallelepiped shape. Protrusions are projected from front and rear inner surfaces to form uneven surfaces 12b and 12c (see FIG. 2).

The weight 13 accommodated in the accommodating portion 12a of the housing 12 has a shape in which the accommodating portion 12a having the above-mentioned shape is reduced to a substantially similar shape, and therefore, as shown in FIG. Weights corresponding to the uneven surfaces 12b and 12c before and after 12a
Roughness is formed on the front and rear outer surfaces of 13, and the other upper and lower surfaces and the left and right outer surfaces are flat. The weight 13 is covered with an elastic body 14 made of a rubber material.

The unevenness surfaces 14b, 14c and left and right side surfaces of the front and rear surfaces of the elastic body 14 covered by the weight 13 and the corresponding uneven front and rear inner surface surfaces 12b and 12c of the storage portion 12a and the left and right inner side surfaces. The recesses and protrusions have a loose fit with a gap C therebetween.

As shown in FIGS. 3 and 4, two spheres 15 are interposed between the weight 13 and the bottom surface of the storage portion 12a via the elastic body 14 at the lower end of the weight 13. The sphere 16 is placed between the elastic body 14 at the upper end of the weight 13 and the ceiling surface of the storage portion 12a.
It is interposed at intervals.

Therefore, the weight 13 is a sphere that is in rolling contact.
It is supported on the bottom surface of the storage portion 12a of the housing 12 via the sphere 15, and can be smoothly moved back and forth and right and left by a margin of the gap C by the rolling of the spheres 15 and 16.

Accordingly, when vibration is input to the seat back 4, the weight 13 is smoothly displaced with respect to the housing 12 with almost no resistance, and comes into contact with the inner surface of the storage portion 12a via the elastic body 14. At that time, the uneven surfaces 14b and 14c of the elastic body 14 on the side of the weight 13 which are loosely fitted to the uneven surfaces 12b and 12c of the storage portion 12a come into contact with each other.
The contact area is large, the friction loss and the energy loss due to collision are large, and the function as an impact damper is sufficiently exhibited.

Further, since the contact areas in contact with each other are large, it is advantageous for durability and tuning of characteristics, and furthermore, the labor for manufacturing and mounting is reduced as compared with the case where many separate impact dampers are installed.

As described above, since the weight 13 is supported through the sphere 15 in the storage portion 12a of the housing 12, it is possible to have an impact even on a flat and nearly vertical shape such as the seat back 4. The damper 11 can be installed without impairing the function, and a vibration damping effect can be obtained with a weight having a small mass against a plurality of resonances of the seat back 4 in a wide frequency range.

Next, an impact damper 21 according to a second embodiment will be described with reference to FIG. The impact damper 21 is a sphere 1 in the impact damper 11.
Low friction members 25 and 26 are used in place of 5 and 16, and the other housing 22, weight 23 and elastic body 24 are the same. Correspondence between the outer surface (forming an uneven surface) of elastic body 24 and storage section 22a This is a vibration reduction device having a gap C having a predetermined width between the inner surface (forming an uneven surface).

It can also be installed in a flat shape such as a seat back that stands upright near the vertical, and the low friction member 25 is a weight.
23 is slidably supported so that the weight 23
Can move smoothly back and forth, right and left, and abut the inner surface of the storage portion 22a via the elastic body 24, and can sufficiently exhibit the function as an impact damper.

Next, an impact damper 31 according to a third embodiment will be described with reference to FIG. The impact damper 31 is a sphere 1 in the impact damper 11.
Instead of 5 and 16, soft elastic members 35 and 3 that are easily elastically deformed
6, the other housing 32, the weight 33, and the elastic body 34 covered by the weight 33 are the same.

Accordingly, there is a gap C of a predetermined width between the outer surface of the elastic body 34 covering the weight 33 and the corresponding inner surface of the storage portion 32a, and the lower elastic member 35 has an upper end. The lower end is fixed to the center of the bottom surface of the storage portion 32a, and the lower end of the upper elastic member 36 is fixed to the center of the upper surface of the elastic member 34 and the upper end is fixed to the center of the ceiling surface of the storage portion 32a. ing. Therefore, an impact damper is constructed in which the weight 33 is displaceably supported by the upper and lower soft elastic members 35 and 36 in the storage portion 32a.

A flat elastic member such as a seat back, which can be installed in the vicinity of a vertical shape, can be used as a soft elastic member.
The weights 33 support the weight 33 so that it can be easily displaced in the front-rear and left-right directions. The contact can be made with a large contact area, and the function as an impact damper can be sufficiently exhibited.

Next, an impact damper 41 according to a fourth embodiment will be described with reference to FIG. The impact damper 41 is a modified example of the impact damper 31, and is an elastic body that covers the weight 43 instead of the elastic members 35 and 36.
The projecting elastic member 45 from which the eight corners of 44 project is used as the storage portion 42a.
And the housing 42 has the same shape, and has a gap C of a predetermined width between the outer surface of the elastic body 44 and the corresponding inner surface of the storage portion 42a. .

A flat and vertically standing shape such as a seat back can also be installed. The protruding elastic member 45 is soft and easily elastically deformed, and supports the weight 33 so that it can be easily displaced forward, backward, left and right. As a result, the weight 43 can move smoothly back and forth and left and right by an amount corresponding to the clearance C, and can abut on the inner surface of the storage portion 42a via the elastic body 44 with a large contact area, so that the function as the impact damper is sufficient. Can be demonstrated.

Next, an impact damper 51 according to a fifth embodiment will be described with reference to FIG. In this impact damper 51, a housing 52, a weight 53, and an elastic body 54 are the same as those in the above-described embodiment, but a wire suspended from the center of the ceiling surface of the storage portion 52a of the housing 52 to support the weight 53. A weight 53 is suspended by 55.

A wire 56 connects the center of the lower end surface of the weight and the center of the bottom surface of the storage portion 52a. A gap C having a predetermined width is provided between the outer side surface of the elastic body 54 and the corresponding inner side surface of the storage portion 52a.

Due to the slight elastic extension allowed by the wires 55 and 56, the weight 53 moves smoothly back and forth and right and left by an allowance of the gap C, and moves to the inner surface of the storage portion 52a via the elastic body 54. The contact can be made, and the function as the impact damper can be sufficiently exhibited.

Although the concave and convex surfaces are formed on the inner side surface of the storage portion and the outer side surface of the elastic body (weight), a simpler structure may be used as a flat surface. Also, the weight was covered with an elastic body, but the inner surface of the housing of the housing is covered with the elastic body, and the weight is used as it is, as an impact damper having a gap between the weight and the elastic body Is also good.

In the above embodiments, the weight is made of steel. However, the material is not limited to steel, and various materials having high density can be considered. The elastic body is formed of a resin or an elastic foam containing the rubber as a main component in addition to the rubber, and a high specific gravity rubber or the like is suitable.

[Brief description of the drawings]

FIG. 1 is a sectional view of a seat to which an impact damper according to a first embodiment of the present invention is applied.

FIG. 2 is a cross-sectional view of the impact damper taken along a line II-II in FIG.

FIG. 3 is a sectional view of the impact damper taken along a line III-III in FIG. 2;

FIG. 4 is a sectional view of the impact damper taken along line IV-IV in FIG.

FIG. 5 is a sectional view of an impact damper according to a second embodiment.

FIG. 6 is a sectional view of an impact damper according to a third embodiment.

FIG. 7 is a sectional view of an impact damper according to a fourth embodiment.

FIG. 8 is a sectional view of an impact damper according to a fifth embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Seat, 2 ... Seat rail, 3 ... Seat, 4 ... Seat back, 11 ... Impact damper, 12 ... Housing, 13
... weight, 14 ... elastic body, 15, 16 ... sphere, 21 ... impact damper, 22 ... housing, 23 ... weight, 14 ... elastic body, 25,
26: Low friction member, 31: Impact damper, 32: Housing, 33: Weight, 34: Elastic body, 35, 36: Elastic member, 41 ...
Impact damper, 42 ... Housing, 43 ... Weight, 44 ...
Elastic body, 45: Projecting elastic member, 51: Impact damper,
52: Housing, 53: Weight, 54: Elastic body, 55, 56: Wire.

Claims (3)

[Claims] 1. A vibration reduction device in which a weight is stored with a gap with respect to an inner surface of a housing portion of a housing, wherein a sliding means is provided between the weight and the inner surface of the housing portion to which the weight of the weight is applied. A vibration reduction device, wherein a relative movement of the weight with respect to the housing is smoothened. 2. A vibration reduction device in which a weight is stored with a gap with respect to an inner surface of a housing portion of a housing, wherein the weight stored in the housing portion of the housing is suspended by a wire, and A vibration reduction device characterized by smoothing relative movement of a weight. 3. The housing according to claim 1, wherein the weight has irregularities on an outer surface thereof, and irregularities which are loosely fitted to the irregularities of the weight are formed on an inner surface of the housing portion of the housing. 2. The vibration reduction device according to 2.