JPS62165040A - Damper device - Google Patents

Abstract

PURPOSE:To increase flowing resistance of viscous fluid so as to improve its vibration damping effect by sectioning an area where the viscous fluid stays between an agitator and the internal wall of a damper container into plural areas by means of a cylindrical body. CONSTITUTION:The device in the title consists of a container 19 made of butyl rubber with excellent vibration damping performance, a spring 18 and an agita tor 23 for raising vibration absorbing effect accompanying viscous fluidity, and it is placed between chassis 16, 17. And viscous fluid 22 such as silicon oil etc. is sealed inside space in the closed section. And a cylindrical body 24 is provided between the agitator 23 and the internal wall of the container 19 and the space of the viscous fluid 22 is sectioned into two spaces. The cylin drical body 24 is constructed with a material hard to be deformed, and the lower part is opened and the upper part is provided with an opening. It is designed only to be put in the container. By this constitution, the flowing resis tance can be made almost four times as much only by dividing the flow path into two, and vibration between the chassis 16, 17 can largely be damped.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a damper device for damping vibrations of equipment.

External vibrations applied to prior art equipment can significantly impair the properties of the equipment. Particularly in recent years, precision equipment that records and reproduces information, such as compact disc players,
Floppy disk devices are rapidly developing and their uses are expanding, and there is a growing need for them to operate stably even in poor operating environments.

Equipment installed in automobiles is subject to vibrations caused by the unevenness of the road surface as the automobile travels, acceleration applied to the vehicle body due to sudden acceleration or sudden stopping, and impact vibrations caused by opening and closing of doors, etc. Vibratory external force is applied to the device in two directions, left and right, front and back.

In a vehicle-mounted compact disc player, it is necessary to provide a careful vibration damping mechanism so that such vehicle body vibrations are not transmitted to the big anop unit, which is the heart of the player and consists of the disc and signal pickup.

FIG. 2 schematically shows the structure of a vehicle-mounted compact disc player. The player is divided into a pickup unit part 1 and a chassis 2. It is coupled to the chassis 2 via a device. In addition, the chassis 2 is directly connected to the automobile body 5. The vibrations generated in the chassis 2, that is, the automobile body, vary in their vibration acceleration, frequency distribution, and direction depending on the traveling speed, road surface condition, automobile suspension, etc. However, generally around 10011z and 10 to 20
The maximum is about 2G in the 0 field range.

As shown in Figure 3, the vibration resistance of the pink-up unit is usually from several thousand meters to around 100,000 meters, and has a frequency range where it is extremely susceptible to vibration due to the resonance phenomenon of the disk. Even in the frequency domain, it only has a vibration resistance of about 2G at most. Therefore, in order to withstand vibration acceleration of 2G in the range of 10 to 2001-&, the vibration characteristics (imaging transfer characteristics) of the vibration system consisting of the pickup unit and the suspension device must be adjusted as shown in Figure 4. Resonant frequency f. is 1
The resonance magnification Q is low, around 0, and the resonance phenomenon of the pickup unit occurs.
It is necessary to design so that the vibration transmissibility is sufficiently small at the frequency z.

Furthermore, since the directions in which the vibrations are applied are not constant, such as up and down, left and right, and two fronts and back, the vibration characteristics described above must be realized in no direction.

FIG. 5 shows the pickup unit and its suspension system of a conventional vehicle-mounted compact disc player.
It consists of an aluminum die-cast chassis 7 mounted on it. 8 is a spindle for mounting a compact disc and rotating it, and 9 is an optical base for mounting an optical pickup actuator, etc. Since mutual positional accuracy is important, these are mounted on a sturdy aluminum die-cast chassis. has been done. 11 is a spring, 12 is a container body made of butyl rubber with excellent vibration damping ability, and has a road surface rolling shape; 13
14 is a lid, and 14 is a high-viscosity silicone oil sealed in the inner space formed by the container 12 and the lid 13. The container 12, the lid 13, and the silicone oil form a damper. Still, one spring 11 and one damper are combined to form connection parts with the chassis 2 at four locations of the pickup unit part 1, thereby forming a suspension system.

FIG. 6 shows a cross-sectional view of the damper springs connected at the four joints.

Damper is pickup sheet metal chassis 6 and chassis 2
The upper and lower ends are engaged with an oval hole provided in the holder. The spring 11 is a compression coil spring, and is designed to support the weight of the pickup unit when in use.

When the car body vibrates and an image is applied to the chassis 2, a relative movement occurs between the pick amplifier sheet metal plates 6 and 6,
As a result, the damper undergoes deformation.

At this time, vibrations are transmitted to the pick-up sheet metal chassis 6 due to the vibration-absorbing effect of the butyl rubber itself that constitutes the lid 13 and the container body 12 of the damper, and the vibration-absorbing effect accompanying the viscous flow of the silicone oil 14 sealed inside the damper. The objective is to attenuate the noise and realize stable operation of the compact disc player. Further, reference numeral 15 denotes an agitator body integrally formed in the center of the container body 12 in order to enhance the effect of absorbing vibrations caused by the viscous flow of the silicone oil 14.

Problems to be Solved by the Invention The vibration absorption effect of the damper can be divided into the vibration absorption effect of the butyl rubber itself and the effect of the flow resistance of the silicone oil. The damper having the above-mentioned structure is designed to have a damper of 0.3 to 0.0 mm so that the resonant frequency of the pickup unit support system can be suppressed to a low level, and the butyl rubber constituting the body can be easily deformed.
The vibration absorption effect of butyl rubber itself is smaller than the flow resistance effect of silicone oil, and most of the damper's vibration absorption effect is produced by the flow resistance effect of Noricon oil.

However, in the damper structure shown in FIG.
However, in order to obtain a vibration absorption effect against non-directional vibrations, it is necessary to leave a gap of about 3 mm between the stirring body and the inner wall of the damper body, and there are cases where sufficient viscous flow resistance cannot be obtained. be. In this case, if a silicone oil with a high viscosity is used, the damping ability will be improved, but if the viscosity exceeds 50,000 cst, the workability of filling the silicone oil will deteriorate, causing manufacturing problems. Other methods have been used, such as increasing the flow resistance by making the shape more complex, such as from a simple cylinder to a prismatic or even wing-like shape, or by joining separate parts with adhesives, etc. In this method, it is not easy to manufacture the stirring body, and as a result, the outside diameter of the stirring body is too small, and the permissible amplitude of the relative vibration between the stirring body and the damper body becomes small.

The present invention provides a means for dramatically improving the vibration damping effect of a damper without increasing the viscosity of silicone oil or complicating the shape of the stirring body.

Means for Solving the Problems In order to solve the above problems, the damper device of the present invention has the following features:
A device mounted between a first section of equipment and a second section of equipment for damping the transmission of non-directional mechanical vibrations of the first section to the second section, the device comprising: a flexible material; It consists of a container body having an approximately cylindrical shape and a lid body having an approximately circular block shape, and a viscous fluid is sealed in an internal sealed space formed by joining the container body and the lid body. , a columnar stirring body provided axially from the center of the end face of either the container body or the lid body toward the inside of the sealed space, between the stirring body and the inner wall of the damper container, The structure includes one or more cylindrical bodies whose inner diameter is larger than the outer diameter of the stirring body and whose outer diameter is smaller than the inner diameter of the damper container.

Function: By configuring the damper of the present invention as described above,
The region where silicone oil exists between the stirring body and the inner wall of the damper container is divided into a plurality of narrower regions by the cylindrical body, and the area between the first part and the second part of the device, that is, the area of the damper The flow resistance of the internal viscous fluid that occurs due to the relative displacement between the vessel body and the stirring body increases, and the vibration damping effect is dramatically improved.

EXAMPLE Hereinafter, a damper device according to an example of the present invention will be described with reference to the drawings.

FIG. 1 shows a sectional view of a damper device according to an embodiment of the present invention. In FIG. 1, 16 is a chassis as the first part of the device, 17 is a pick-up sheet metal chassis as the second part of the device, 18 is a spring, and 19 is a roughly rotating body made of butyl rubber with excellent vibration damping ability. 2Q is a lid, which is joined to the container body 19 at the outer edge 21 by a rubber vulcanization reaction.
22 is a viscous fluid such as silicone oil, 23 is a viscous fluid 2
This is a stirring body that enhances the effect of absorbing vibrations accompanying viscous flow. 24 is a cylindrical body, which includes the stirring body 23 and the vessel body 19.
It is installed between the inner walls of the viscous fluid 22 and divides the region of the viscous fluid 22 into two regions.

The other configurations are similar to the conventional example shown in FIG. 2, and the chassis 2 in FIG. 2 corresponds to the chassis 16 in FIG. 1.

This cylindrical body is simply inserted into the damper container without being joined to either the stirring body 23 or the container body 19.

FIG. 7 is a perspective partially cutaway view of the cylindrical body 24. As shown in FIG. The cylindrical body is
It is preferable to use a rigid material that does not cause deformation as much as possible, and here rubber with a hardness of 3d) is used. The lower part of the cylindrical body is open, and the upper part has an end surface 26 in which an opening 25 is provided.

This opening 25 is an air vent hole when inserting the cylindrical body 24 into the damper container.

The effects of the damper device configured as described above will be explained with reference to FIGS. 8 and 9.

Figures 8 and 9 schematically show the state of flow of viscous fluid inside the damper. Figure 8 shows the conventional damper,
Fig. 9 shows the case of a damper according to an embodiment of the present invention, in which Fig. A is in a stationary state and Fig. B is in a vibration state, that is, relative movement in the horizontal direction has occurred between the agitator and the damper container. It indicates the condition.

The viscous fluid flows inside the damper container with the movement of the agitator, but the flow resistance is due to the gap between the fluid and the fluid flow.
Since the flow resistance increases in inverse proportion to the power of the flow resistance, the flow resistance can be increased approximately four times by simply dividing the flow path into two as shown in FIG.

Also, in the vertical direction, it can be increased approximately twice by the same idea.

In the above embodiment, the stirring body is fixed at the center of the end face of the container body, but it goes without saying that it is also possible to fix it at the center of the end face of the lid body.

In addition, although the above example shows the case where there is only one cylindrical body, it is possible to further reduce the flow path area of the viscous body by inserting a plurality of cylindrical bodies with different inner diameters in a stacked manner. It can also increase resistance.

Effects of the Invention As described above, the present invention has a configuration in which a cylindrical body is inserted between the agitator and the damper container wall inside the damper container containing the viscous fluid, so that the first part of the device and The viscous flow resistance of the viscous fluid caused by the relative vibration between the second portions can be dramatically improved.

Furthermore, a noteworthy effect of the present invention is that the cylindrical body can be simply put into the viscous fluid in the damper container, and the shape of the stirring body can be changed from a simple cylinder to a prismatic cylinder as in the past. Furthermore, it has the advantage that it is very simple to manufacture, as there is no need to make it complicated by adding blade-like parts, or to increase flow resistance by joining separate parts with adhesives. have

Another advantage is that according to the configuration of the present invention, a damper effect can be obtained without reducing the permissible amplitude of relative vibration between the stirring body and the damper body.

[Brief explanation of drawings]

1. Fig. 1 is a sectional view of a damper device according to an embodiment of the present invention, Fig. 2 is a schematic illustration of the vibration system of a vehicle-mounted compact disc player, and Fig. 3 is a vibration-resistant characteristic of the pink-up unit of the vehicle-mounted compact disc player. FIG. 4 is an explanatory diagram of the vibration transmission characteristics required for the pickup support system of an in-vehicle compact disc player. FIG. 6 is an explanatory perspective view of the pickup unit support system of an in-vehicle compact disc player. FIG. 3 is a plan cross-sectional view schematically showing the flow state of viscous fluid inside the damper device of the conventional example and the damper of an embodiment of the present invention, respectively. 16... Shear 7 (first part of equipment), 17
... Pickup sheet metal chassis (second part of the device), 19 ... Container body, 2o ... Lid body, 22 ... Viscous fluid, 23. ... Stirring body, 24 ... Cylindrical body. Name of agent: Patent attorney Toshio Nakao and 1 other person11
i--54, -shi (Isoshi 1-fri (1-1) 22-11 5 stocks Aiba 23-Gi 1 tsubo 2 dou-voice 1 1 to 2 (tsu 3) Figure 4: 1 toz: (rq) Figure 8 (c) (δ) Figure 9

Claims (2)

[Claims] (1) A device installed between a first part of the equipment and a second part of the equipment to damp the transmission of non-directional mechanical vibrations of the first part to the second part, which is made of rubber, etc. It consists of a container body having a substantially cylindrical shape and a lid body having a generally disc shape, made of a flexible material, and an internal sealed space formed by joining the container body and the lid body. a columnar agitation body enclosing a viscous fluid and provided axially from the center of an end face of either the container body or the lid body and toward the inside of the sealed space; the agitation body and the vessel body; A damper device characterized in that one or more cylindrical bodies having an inner diameter larger than an outer diameter of the stirring body and an outer diameter smaller than the inner diameter of the stirring body are interposed between the inner walls of the damper device. (2) The damper device according to claim 1, wherein one end of the cylindrical body is open, and the other end has an end face with an opening.