JPH06129488A - Vibro-isolator with dynamic vibration absorber - Google Patents

Abstract

PURPOSE:To secure a vibro-isolator that is able to disuse a spring for elastically supporting a supported body, and besides, simple in structure and inexpensive in cost. CONSTITUTION:A vibro-isolator 18 being interposed between a support body and a supported body 16 and serving as a vibration isolating action is provided with a dynamic vibration absorber consisting of a system between a specified elastic support part 32 and a weight 34 to an elastic body 20 constituting the main body of the vibro-isolator 18.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-vibration device with a dynamic anti-vibration device that is suitable for supporting anti-vibration of small precision equipment such as a CD player.

[0002]

2. Description of the Related Art When a CD player is mounted on a vehicle,
Conventionally, in order to prevent vibration of a vehicle or the like from being directly transmitted to the main unit of a CD player and causing skipping, it is conventionally necessary to use a conventional structure shown in FIG.
As shown in FIG. 3, the main body unit 100 of the CD player is elastically supported via a metal spring 101, and
The main body unit 100 and the support body (frame) 102
The viscous fluid-sealed damper 104 is interposed between the and.

FIG. 6B shows a concrete structure of the damper 104 which has been conventionally used. As shown in the figure, the damper 104 has a highly viscous fluid (silicone oil) inside a closed container. ) 106 is enclosed and the viscous fluid 106 has a stirrer 108 protruding therein.

The stirring portion 108 is supported in a floating state by a thin fold-like flexible portion 110 made of an elastic material (usually a rubber material), and the support 102 and the supported body (main body unit) 100 face each other. When displaced, the stirring unit 108 migrates in the viscous fluid 106 to stir the viscous fluid 106,
Vibration is damped by energy absorption at that time.

[0005]

However, the viscous fluid-sealed damper 104 is complicated in shape and processing for manufacturing and is expensive, and the viscous fluid inside 10 is used.
There is a problem that 6 may leak during use.

The damper 104 is exclusively for damping vibration and does not have a function of supporting the main body unit 100. Therefore, a spring 101 is additionally required for supporting the main body unit 100 for vibration isolation. There is a problem with.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and its gist is to provide a vibration-proof function by being interposed between a support and a support. In the vibration isolator, a dynamic vibration reducer including a system of a predetermined elastic support portion and a weight is provided for an elastic body that is the main body of the vibration isolator.

[0008]

The dynamic vibration reducer (dynamic damper) heretofore has been known as a device which changes the resonance point of a system including a supported body having a predetermined mass and a spring supporting the same and reduces the resonance magnification. It is known.

For example, when a supported body 112 having a mass M is supported by a spring 114 having a spring constant K as shown in the model diagram of FIG. 7A, the natural frequency of the system of the supported body 112 and the spring 114. f ₀ is given by the following formula [Equation 1].

[0010]

[Equation 1]

When the weight 118 is further supported on the supported body 112 having the mass M via the spring 116, resonance of the system composed of the supported body 112 and the spring 114 and the spring 11 are performed.
The resonance of the system composed of 6 and the weight 118 interferes with each other, and the overall resonance magnification becomes low.

For example, the spring constant of the spring 116 is k, and the weight 1
If the mass of 18 is m, and K / M = k / m, the resonance point is f ₀ as shown in FIG. 7B.
It is divided into both sides, and the resonance magnification also decreases.

According to the present invention, the dynamic vibration absorber consisting of the weight and the spring is directly provided on the elastic body which is the main body of the vibration isolator. According to the present invention, the damper is the same as the conventional damper. Can effectively suppress the vibration transmission at resonance,
In addition, since the elastic body also has the same function as that of the spring 101 or the like, that is, the function as a conventional elastic body for supporting vibration isolation, for elastically supporting a supported body such as the main body unit of the CD player, for example. It is possible to omit the required spring.

Further, in the case of the vibration isolator of the present invention, it is not necessary to seal the viscous fluid inside the closed container unlike the conventional viscous fluid sealing damper, so that the structure can be simplified.
Moreover, there is no problem that the viscous fluid leaks during use.

[0015]

Embodiments of the present invention will now be described in detail with reference to the drawings. In FIG. 2, reference numeral 10 is a support body such as a support frame in a CD player, 12 is a supported body such as a main body unit, and the support portion 14 (see FIG. 1) of these support bodies 10 and the supported portion 16 of the supported body 12 A vibration isolator 18 with a dynamic vibration absorber for vibration-isolating and supporting the supported body 12 is interposed therebetween.

The vibration isolator 18 has a cylindrical rubber elastic body 20 as shown in FIG. The upper end portion of the rubber elastic body 20 is formed as a thick portion 22 and an annular groove 24 is formed therein, and the annular groove 24 is fitted and fixed to the supported portion 16. On the other hand, a small diameter cylindrical portion 26 is provided at the bottom of the rubber elastic body 20, and a shaft body 30 that rises from the support portion 14 into a fitting hole 28 of the cylindrical portion 26.
Are fitted.

From the rubber elastic body 20, a support portion 32 having a radial shape at the base end and an annular shape at the tip end is integrally extended horizontally from the upper and lower intermediate height portions, and a ring-shaped weight is provided on the support portion 32. 34 is adhesively fixed on the upper end surface.

The weight 34 is supported so as to form a predetermined gap with the rubber elastic body 20 having a cylindrical shape. Here, the rubber elastic body 20 has a function similar to that of an ordinary vibration-proof support rubber, that is, the metal spring shown in FIG. 6A, and the weight of the supported body 12 is reduced by the rubber elastic body 20. Supports elastically.

On the other hand, the supporting portion 32 and the weight 34 constitute a dynamic vibration reducer, and have a good vibration damping action based on this dynamic vibration reducer. Incidentally, when the vibration transfer characteristics were measured using this vibration isolator 18, the results shown in FIGS. 3 to 5 and Table 1 were obtained.

[0020]

[Table 1]

Here, FIG. 3 shows the result when the supported body 12 is elastically supported by the rubber elastic body 20 alone, and FIG. 4 shows that the weight of the weight 34 is 10% of the weight of the supported body 12. 5 shows that the weight of the weight 34 is the weight of the supported body 1.
The results when 20% of 2 are shown, respectively.

In these figures, A is a curve showing the phase difference between the input vibration and the output vibration, and B is a curve showing the vibration transmission. In the curve A indicating the phase difference, the region where the phase difference is large indicates that resonance occurs, and the peak value in the transmissibility curve B indicates the transmissivity at resonance.

From the results of FIGS. 3 to 5 and the results of Table 1, the resonance point is divided by providing the rubber elastic body 20 with the dynamic vibration reducer including the support portion 32 and the weight 34.
Further, it can be seen that the transmissibility at the time of resonance becomes lower, and the transmissivity at the time of resonance becomes lower by increasing the weight of the weight 34.

Although the embodiment of the present invention has been described in detail above, this is merely an example, and in the present invention, the weight 34 can be supported by a support portion formed of a metal leaf spring, and other embodiments. It can be applied to various forms of anti-vibration devices,
The present invention can be configured in a form in which various changes are made based on the knowledge of those skilled in the art without departing from the spirit of the invention.

[Brief description of drawings]

FIG. 1 is a diagram of a vibration isolation device that is an embodiment of the present invention.

FIG. 2 is a view showing a state in which a supported body is supported by a vibration isolation device.

FIG. 3 is a comparative example diagram for explaining the features of the image stabilization device shown in FIGS. 1 and 2.

FIG. 4 is a diagram showing the characteristics of the vibration isolation device.

FIG. 5 is a diagram showing the characteristics when the weight of the weight of the vibration isolator is changed.

FIG. 6 is a background illustration of the present invention.

FIG. 7 is a comparative example diagram for explaining the principle of the dynamic vibration reducer in the vibration isolator of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 support body 12 supported body 18 anti-vibration device 20 rubber elastic body 32 support portion

Claims (1)

[Claims] 1. A vibration damping device, which is interposed between a support and a supported body to perform a vibration damping function, wherein a predetermined elastic support portion and a weight are provided for a main elastic body. An anti-vibration device comprising: