JPH08285005A - Damper - Google Patents

Abstract

PURPOSE: To display sufficient vibration damping effect, and also adequately cope with the change of a vibration frequency or with a case where plural frequencies exist, by setting a resonance system, composed of an elastic body and a mass body, in addition to this, first and second liquid column resonance systems by first and second orifices respectively. CONSTITUTION: In designing resonance these systems, at first, the resonance systems, composed of first and second elastic bodies 5 and 9 and mass body 10, are set so as to resonate a main vibration caused in an article to be vibration-damped, and also, e.g. a second orifice is similarly set so as to resonate the main vibration, thereby making high damping obtainable to display sufficient vibration damping effect. Also, e.g. a first orifice 19 is set so as to resonate a secondary vibration caused in the article to be vibration-damped, thereby making second vibration restrainable to adequately cope with a case wherein a frequency is changed or a case where plural frequencies exist.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a damper in which a mass body is connected to a mounting portion via an elastic body made of a rubber-like elastic material. More specifically, the damper is attached to a vibration-damped object by the mounting portion. The present invention relates to a damper that suppresses absorption of vibration generated in a vibration-damped object by resonance operation of a resonance system including an elastic body and a mass body.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG.
1 is connected to a mass body (also referred to as a mass) 53 via an elastic body 52 made of a rubber-like elastic material, and is attached to a vibration-damped object (not shown) with a mounting portion 51. There is known a dynamic damper (also referred to as a dynamic vibration absorber) that suppresses absorption of vibration generated in a vibration-damped object by resonance operation of a resonance system formed by the mass body 53.

However, this damper absorbs and suppresses the vibration generated in the vibration-damped object only by the resonance operation of the resonance system constituted by the elastic body 52 and the mass body 53. Therefore, according to this damper, there is a problem that the damping effect is insufficient in some cases. Further, according to this damper, since one natural frequency of the resonance system constituted by the elastic body 52 and the mass body 53 is predetermined and there is no other resonance element, the vibration generated in the vibration-damped object can be suppressed. There is a problem that cannot be dealt with when the frequency changes or when there are multiple vibration frequencies.

[0004]

In view of the above points, the present invention has a resonance element in addition to the resonance system constituted by the elastic body and the mass body, and can thereby exert a sufficient vibration damping effect. At the same time, it is an object of the present invention to provide a damper capable of appropriately coping with the case where the frequency of vibration generated in the object to be controlled changes or when there are a plurality of vibration frequencies.

[0005]

In order to achieve the above object, a damper of the present invention is a damper in which a mass body is connected to a mounting portion via an elastic body made of a rubber-like elastic material, and a diaphragm is attached to the mounting portion. An airtight space surrounded by the diaphragm, the elastic body, and the mass body connected to each other is provided, and the first and second partition parts are provided in the airtight space to form the airtight space with the first liquid chamber on the diaphragm side. The second liquid chamber between the partition parts and the third liquid chamber on the side of the mass body are partitioned, and the first partition part is provided with a first orifice for communicating the first liquid chamber and the second liquid chamber with each other. The second partition is provided with a second orifice that connects the second liquid chamber and the third liquid chamber, and the working liquid is sealed in each of the liquid chambers.

[0006]

In the damper of the present invention having the above structure,
In addition to the resonance system constituted by the elastic body and the mass body, a first liquid column resonance system by the first orifice and a second liquid column resonance system by the second orifice are set. Therefore, first, the resonance system constituted by the elastic body and the mass body is set to resonate with the main vibration generated in the vibration-damped object, and at least one of the first and second liquid column resonance systems is Similarly, by setting so as to resonate with the main vibration, it is possible to obtain a high damping and thereby to exert a sufficient damping effect. In addition to this, the other of the first and second liquid column resonance systems is set to resonate with the subordinate vibration generated in the vibration-damped object, thereby suppressing the second vibration. Is possible.

[0007]

Embodiments of the present invention will now be described with reference to the drawings.

As shown in FIG. 1, a first orifice plate 4, a first elastic body 5 made of a rubber-like elastic material, a first mounting plate 6 and a second mounting plate 1 are provided on a mounting portion 1 having a lid 2 and a mounting bolt 3. A mass body (also referred to as a mass) 10 having a predetermined mass is connected via an orifice plate 7, a second mounting plate 8 and a second elastic body 9 made of a rubber-like elastic material, and is provided inside the mounting portion 1. Diaphragm 1 made of rubber-like elastic material
1 are connected by an outer peripheral edge portion 11a thereof, and an airtight space 12 is provided inside the damper, and the airtight space 12 is laminated with the first partition portion 13 having the first orifice plate 4. The first liquid chamber 16 on the side of the diaphragm 11 and the two partition parts by the second partition part 15 provided with the first mounting plate 6, the second orifice plate 7 and the second mounting plate 8 which are bolted in the shape of bolts 14. 1
A first liquid chamber 17 partitioned between the third liquid chamber 17 and the third liquid chamber 18 on the side of the mass body 10, and the first partition 13 connects the first liquid chamber 16 and the second liquid chamber 17 to each other. An orifice 19 is provided, and a second orifice 20 that connects the second liquid chamber 17 and the third liquid chamber 18 is provided in the second partition section 15.
A working fluid 21 such as a viscous fluid is sealed in 6, 17, and 18.

In the mounting portion 1, the lid 2 has an outer peripheral edge portion 2.
A is caulked and fixed to the outer peripheral edge portion 11a of the diaphragm 11 as well as to the outer peripheral edge portion 4a of the first orifice plate 4, so that the first orifice plate 4 is fixedly connected to the mounting portion 1. The first elastic body 5 is vulcanized and bonded to the first orifice plate 4 and the first mounting plate 6, and the second elastic body 9 is vulcanized and bonded to the second mounting plate 8 and the mass body 10. 9 is formed of the same kind of rubber-like elastic material.
The second partition 15 is elastically supported between the two. still,
Both elastic bodies 5 and 9 may be integrated.

The dynamic damper (also referred to as a dynamic vibration absorber) according to the embodiment having the above-mentioned structure is attached to a vibration-damped object (not shown) by the attachment portion 1, and the first and second elastic bodies are also attached. The first and second elastic bodies 5, 9 and the mass body are for suppressing the vibration generated in the vibration-damped object by the resonance operation of the resonance system formed by the mass bodies 5, 9. In addition to the resonance system constituted by 10, the first liquid column resonance system by the first orifice 19 and the second liquid column resonance system by the second orifice 20 are provided. Therefore, when designing these resonance systems, first, the resonance system constituted by the first and second elastic bodies 5 and 9 and the mass body 10 is made to resonate with the main vibration generated in the vibration-damped object. While setting, either one of the first and second liquid column resonance systems (for example,
By setting the second liquid column resonance system) so as to resonate with the main vibration as well, high damping can be obtained, and thereby a sufficient vibration damping effect can be exhibited. In addition to this, by setting the other of the first and second liquid column resonance systems (for example, the first liquid column resonance system) to resonate with the subordinate vibration generated in the vibration-damped object, It is possible to suppress this second vibration as well, so that it is possible to appropriately deal with the case where the frequency of the vibration generated in the vibration-damped object changes or when there are multiple vibration frequencies. Becomes That is, as shown by the solid line in the graph of FIG. 2, the damping effect can be exerted in a wide frequency range from low frequencies to high frequencies. still,
In FIG. 2, a dotted line shows an original state without a damper, and a chain line shows an operating state by the conventional damper shown in FIG. 4 as comparative examples. Further, FIG. 3 shows modeling of the dynamic damper according to the embodiment.

[0011]

The present invention has the following effects.

That is, in the damper of the present invention having the above-mentioned structure, in addition to the resonance system constituted by the elastic body and the mass body, the first liquid column resonance system by the first orifice,
A second liquid column resonance system with a second orifice is provided. Therefore, first, the resonance system constituted by the elastic body and the mass body is set to resonate with the main vibration generated in the vibration-damped object, and at least one of the first and second liquid column resonance systems is Similarly, by setting the vibration so as to resonate with the main vibration, it is possible to obtain high damping, and thereby it is possible to exert a sufficient vibration damping effect. In addition to this, the other of the first and second liquid column resonance systems is set to resonate with the subordinate vibration generated in the vibration-damped object, thereby suppressing the second vibration. This makes it possible to appropriately deal with the case where the frequency of the vibration generated in the vibration-damped object changes and the case where there are a plurality of vibration frequencies. Therefore, according to the present invention, it is possible to provide a damper product capable of exerting a sufficient vibration damping effect and also exerting a vibration damping effect in a wide frequency range from a low frequency to a high frequency.

[Brief description of drawings]

FIG. 1 is a sectional view of a damper according to an embodiment of the present invention.

FIG. 2 is a graph showing vibration damping characteristics of the damper.

[Fig. 3] Model diagram of the damper

FIG. 4 is a sectional view of a damper according to a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mounting part 2 Lids 2a, 4a, 11a Outer peripheral edge part 3 Mounting bolt 4 1st orifice plate 5 1st elastic body 6 1st mounting plate 7 2nd orifice plate 8 2nd mounting plate 9 2nd elastic body 10 Mass body 11 Diaphragm 12 Airtight space 13 First partition part 14 Bolt 15 Second partition part 16 First liquid chamber 17 Second liquid chamber 18 Third liquid chamber 19 First orifice 20 Second orifice 21 Working fluid

Claims (1)

[Claims] 1. A damper in which a mass body (10) is connected to the mounting portion (1) through elastic bodies (5) (9) made of rubber-like elastic material, and a diaphragm (11) is attached to the mounting portion (1). To connect the diaphragm (11) and the elastic body (5)
An airtight space (12) surrounded by (9) and the mass body (10) is provided, and first and second partition parts (13) and (15) are provided in the airtight space (12) to provide the airtight space (1
2) the first liquid chamber (16) on the diaphragm (11) side,
The second liquid chamber (17) between both partition parts (13) and (15) and the third liquid chamber (18) on the side of the mass body (10) are partitioned, and the first partition part (13) is divided into the first liquid chamber and the first liquid chamber. A first orifice (19) that connects the liquid chamber (16) and the second liquid chamber (17) is provided, and the second partition (15) is provided with the second liquid chamber (17) and the third liquid chamber. A second orifice (20) communicating with (18) is provided, and each liquid chamber (16) (17) is provided.
A damper characterized in that a hydraulic fluid (21) is enclosed in (18).