JPS62288739A - Damper device and its manufacture - Google Patents

Abstract

PURPOSE:To greatly improve a vibration damping effect without increasing the viscosity of a viscous fluid by enclosing a sponge rubber impregnated with said viscous fluid in a damper container, in a damper device for a vehicle loaded compact disk player, etc. CONSTITUTION:A damper device which is installed in between a chassis 16 and a pick-up plate metal chassis 17, is a device for damping down the transmission of the non-directional mechanical vibration of the chassis 16 to the pick-up plate metal chassis 17. The damper device consists of a cylindrical vessel body 19 made of butyl rubber with excellent vibration damping capacity and a disk shaped cover body 20. A viscous fluid 22 such as a silicone oil, etc. and a sponge rubber 24 which is immersed partly or wholely into the viscous fluid are enclosed in a sealed spaced which is formed by joining the vessel body 19 and the cover body 29, and a stirring body 23 for increasing a vibration absorbing effect accompanying the viscous flow of the viscous fluid 22 is provided in it. As for the manufacture of the device, a sponge rubber 24 which is impregnated with the viscous fluid 22 is inserted into the vessel body 19, which is joined to the cover body 20.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention Field of Industrial Application The present invention relates to a damper device for damping vibrations of equipment and a method of manufacturing the same.

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,
With the rapid development of floppy disk devices, the applications for which they are used 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 shock vibrations caused by opening and closing of doors, etc. Vibratory external force is applied to the device in 9 directions from left to right and back and forth.

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

FIG. 2 schematically shows the structure of an in-vehicle compact disc player. The player is divided into a pickup unit section 1 and a chassis 2. The pickup unit section 1, which does not allow photographing, is composed of a damper 3 and a spring 4. It is coupled to the chassis 2 via a suspension system. Further, the chassis 2 is directly connected to the automobile body 5.

The vibration acceleration 9 frequency distribution and directionality of the vibrations generated in the chassis 2, that is, the automobile body, vary depending on the driving speed, road surface condition, suspension purpose of the automobile, etc., but in general, the frequency is around 1001-1z. Centered 10-2
The maximum value is about 2G in the range of 001-h.

As shown in Figure 3, the vibration resistance of the pickup unit is usually in the frequency range from +11 to around 100, where it is extremely susceptible to vibration due to the resonance phenomenon of the disk, and also in other frequency ranges. It only has a vibration resistance of about 2G at most. Therefore, in order to withstand 2G imaging acceleration in the range of 10 to 2001-1z, the imaging characteristics (vibration transmission characteristics) of the vibration system consisting of the pickup unit and suspension device are as shown in Figure 4. Its resonance frequency f0 is as low as around 101, and its resonance magnification Q is also 74%.
It is necessary to design the vibration transmissibility to be sufficiently small at a frequency of several tens to a hundred or so, where the resonance phenomenon of the pickup unit occurs.

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

FIG. 6 shows the pickup unit section 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 and rotating a compact disc, and 9 is an optical base for mounting an optical pickup actuator, etc. Since mutual positional accuracy is important, these are mounted on a robust 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 substantially rotating body 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. Further, 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.

The damper is a pickup sheet metal Shaan 6 and chassis 2
The upper and lower ends are engaged with circular holes provided in the. The spring 11 is a compression coil spring, and is designed to support the weight of the pickup unit when in use.

When the vehicle body vibrates and vibration is applied to the chassis 2, a relative movement occurs between the pickup sheet metal chassis 6 and the damper, which causes deformation of the damper.

At this time, the vibration is transmitted to the pink-up sheet metal chassis 6 due to the vibration absorption effect of the butyl rubber itself that constitutes the lid 13 and the container body 12 of the damper, and the vibration absorption effect accompanying the viscous flow of the silicone oil 14 sealed inside the damper. The purpose of this invention is to attenuate the image pickup caused by the camera, thereby realizing stable operation of the compact disc player. Further, 15 is an agitating body that is integrally formed in the center of the vessels 1 and 2 in order to enhance the absorption effect 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. In order to keep the resonance frequency of the pickup unit support system low, the damper with the above-mentioned structure has a damper of 0.3 to 0.0, so that the butyl rubber constituting the body can be easily deformed.
, 5 am 8 degrees, so the vibration absorption effect of the butyl rubber itself is smaller than the flow resistance effect of the silicone oil, and most of the vibration absorption effect of the damper is produced by the flow resistance effect of the silicone oil.

However, in the damper structure shown in FIG.
However, in order to obtain a vibration absorption effect against non-directional vibrations, the gap between the stirring body and the inner wall of the damper body must be approximately 3 mm, and sufficient viscous flow resistance cannot be obtained. There is. 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 be poor and problems will arise in manufacturing.

In addition, conventional methods have been used to make the shape of the agitating body more complex, such as a simple cylinder, a square column, or even a blade-like shape, or to increase the flow resistance by joining separate parts with adhesive etc. However, with these methods, it is not easy to manufacture the stirring body, and as a result, the outer diameter of the stirring body becomes large, and the permissible value of the amplitude of relative vibration between the stirring body and the damper body decreases. was there.

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 a substantially cylindrical shape and a lid body having a roughly disc shape, and a viscous fluid and its viscous fluid are contained in the internal sealed space formed by joining the container body and the lid body. The structure is such that one or more pieces of sponge rubber are immersed partially or completely in a fluid, and the manufacturing method includes pre-impregnating the sponge rubber with a part or all of the viscous fluid. After this, the sponge rubber impregnated with the viscous fluid and the remaining viscous fluid are inserted into the container body, and then the lid body and the container body are joined by a vulcanization reaction.

Function: By configuring the damper of the present invention as described above,
The flow resistance of the viscous fluid caused by the deformation of the vessel body due to the relative displacement between the first part and the second part of the device increases, and the vibration damping effect is dramatically improved. Moreover, even if a viscous fluid with a relatively low viscosity is used, a high vibration damping effect can be obtained, so it is possible to solve the difficulty in injecting a high viscosity fluid into the damper body.

In addition, sponge rubber is impregnated with viscous fluid in advance by vacuum impregnation method, etc.
By swinging the Nesusen A Sairabarihiro tip, even highly viscous fluids with poor fluidity can be easily inserted into the vessel, dramatically improving work efficiency. do.

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. 20 is a lid, which is joined to the container body 19 at an 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 for enhancing the effect of absorbing vibrations accompanying viscous flow. Reference numeral 24 is sponge rubber and has a substantially cylindrical shape, the outer circumferential surface of which is in contact with the inner wall surface of the container body 19, and the inner circumferential surface of which is spaced apart from the outer circumferential surface of the stirring body 23.

The rest of the structure is similar to the conventional example shown in FIG. 2, and the shear 2 in FIG. 2 corresponds to the chassis 16 in FIG. 1.

FIG. 7 shows an embodiment of the method for manufacturing this damper.

The process consists of steps (1) to (goods) shown in the figure. That is, in step (I) 2, the sponge rubber formed into a predetermined shape is impregnated with silicone oil by a vacuum impregnation method.

Step (■): Inject additional silicone oil into the vessel.

Step (I[I): A sponge rubber impregnated with silicone oil is inserted into the container.

Process cost): The lid body is vulcanized and bonded to the vessel body.

The damper device is manufactured by the following process.

In the above-described embodiment of the damper device, the sponge rubber is used as a single cylindrical body, and the outer circumferential surface thereof is in contact with the inner wall of the vessel, but as shown in FIG. It is also possible to adopt a structure in which the container is enclosed, or a structure in which the sponge rubber 26 occupies almost the entire interior of the container without an agitator, as shown in FIG.

Further, regarding the manufacturing method, the step (n) and the process cloth in FIG. 7 may be interchanged. In short, it is sufficient to impregnate the sponge rubber with a viscous fluid in advance before inserting it into the vessel.

Effects of the Invention As described above, the present invention has a structure in which sponge rubber is immersed inside a damper container filled with viscous fluid, so that the vibration caused by relative vibration between the first part and the second part of the device can be reduced. The viscous flow resistance of viscous fluid can be dramatically improved (1), and a large vibration damping effect can be obtained.

Furthermore, according to the manufacturing method of the present invention, it is possible to insert a viscous fluid, which has conventionally been difficult to inject into a vessel body due to its high viscosity, into a vessel body together with sponge rubber, which has a complicated shape. Also in the vessel body, the inclusion of air bubbles, which is a problem in the injection of viscous fluid, is reduced, and the effectiveness of the work efficiency is greatly improved and productivity is improved.

Furthermore, since a large vibration damping effect can be obtained even with a low viscosity fluid, productivity can be further improved when a low viscosity fluid with good workability is used.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a damper device according to an embodiment of the present invention, Fig. 2 is a schematic diagram illustrating the vibration system of an in-vehicle compact disc player, and Fig. 3 is a diagram showing the pounding resistance of the pickup unit of an in-vehicle compact disc player. Explanatory diagram, 4th
The figure is an explanatory diagram of the vibration transmission characteristics required for the pickup support system of an in-vehicle compact disc player. Figure 6 is an explanatory perspective view of the pickup unit support system of an in-vehicle compact disc player. Figure 6 is a sectional view of a conventional damper device. , FIG. 7 is a process diagram of a method for manufacturing a damper device according to one embodiment of the present invention, and FIGS. 8 and 9 are sectional views of a damper device according to another embodiment of the present invention. ... Pickup sheet metal chassis (second part of the device), 19 ... Container body, 20 ... Lid body, 22 ... Viscous fluid, 23. ... Stirring body, 24 ... Sponge rubber. Name of agent: Patent attorney Toshio Nakao and one other person I6
・--Searshi (Shirou (Eisai 1^ ^ and η)) f7・--Pirek7y7'JJtnf-shi() (p-sai?d henchmen) 22
・-Gashi Wang 2 U1 Left 5 Shito, 23-, Kasuribai 1 訃24・-Snow jt'njiko Otsu 1 FFI2 Figure 3 Figure 4 Figure X 5 Blade number 7 Figure 8 Figure 9

Claims (3)

[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 damper device characterized by enclosing a viscous fluid and one or more sponge rubber bodies that are partially or completely immersed in the viscous fluid. (2) A columnar stirring body is provided axially from the center of the end face of either the container body or the lid toward the inside of the sealed space, and the stirring body is provided between the stirring body and the inner wall of the container body. 2. The damper device according to claim 1, wherein a sponge rubber having a substantially cylindrical shape is disposed so as to enclose the stirring body. (3) Consisting of a roughly cylindrical container made of a flexible material such as rubber and a roughly disc-shaped lid, the interior is formed by joining the container and the lid. A method for manufacturing a damper device in which a viscous fluid and sponge rubber are sealed in a sealed space, the method comprising impregnating the sponge rubber with a part or all of the viscous fluid, and then the sponge rubber impregnated with the viscous fluid and the remainder. A method for manufacturing a damper device, comprising: inserting a viscous fluid into the vessel body, and then joining the lid body and the vessel body by a vulcanization reaction.