JPH0740748Y2 - Viscous fluid filled damper - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a viscous fluid-sealed damper used for absorbing vibration to precision equipment.

[Conventional technology]

When external vibration is applied to the precision instrument, the performance of the precision instrument may be impaired. In particular, in recent years, precision instruments for measuring or recording or reproducing information, such as compact disc players and floppy disc devices, have developed remarkably and their places of use have expanded, so that they can operate stably even in poor use environments. Is required.

For equipment mounted on automobiles, the vibration generated on the automobile body depends on the road surface, running speed, engine conditions, etc.
It is in the range of 5 to 400 Hz, and the direction of vibration is not constant in the vertical and horizontal directions, and the vibration is nondirectional. Therefore, in the compact disc player for use in vehicles, it is necessary to significantly reduce the resonance magnification in the resonance vibration region in all directions to prevent skipping of sounds.

FIG. 4 is a diagram showing a main part of the compact disc player.

In the figure, 1 is a support member such as a chassis. This support member 1
Is a frame for mounting a compact disc player. On the support member 1, a supported member 2 such as a mechanical chassis is a coil spring 3 that is an elastic support urging means.
And is supported by a liquid-filled damper 60.

A turntable 4a for supporting and rotating the compact disc D on the supported member 2, a motor mechanism 4 for rotationally driving the turntable 4a, an optical pickup 5, an electronic circuit unit (not shown), a display mechanism, and an external unit. It is equipped with a connection connector mechanism.

The optical pickup 5 faces the recording surface of the compact disc D in a non-contact manner, and reads the recording sequentially.
and a guide mechanism 5b for moving the reading mechanism 5a along the disk D.

A tracking servo device and a focusing servo device are provided in the reading mechanism 5a, and the irradiation state of the laser beam is corrected by finely moving the objective lens at a relatively high frequency. Therefore, when the compact disc player is directly subjected to external vibrations and impacts, it cannot be sufficiently corrected by the servo device, which hinders the reading operation and causes skipping.

A liquid-filled damper for absorbing the vibration of such a compact disc player is known as shown in FIG.

The liquid-filled damper 60 is mounted between the support member 1 and the supported member 2 via a support shaft 66 provided on the supported member 2. The liquid-filled damper 60 has a cylindrical container portion 61 formed of a rubber material such as butyl rubber, and a thin walled portion that covers the opening by adhering the outer peripheral edge portion to the annular opening adhesion end surface 61b of the container portion 61. A lid portion 62 formed of an elastic material such as rubber and the opening of the container portion 61 are covered with the lid portion 62, and a closed accommodation space 65 is formed inside the container portion 61 and is enclosed in the accommodation space 65. And viscous fluid 65a. A tubular support shaft insertion portion 62a into which a support shaft 66 implanted in the supported member 2 is fitted is provided at the center of the lid portion 62, and the container portion 61 has a bottom portion 61a.

The lid portion 62 has a flange portion 62b on the outer peripheral edge thereof, and between the support shaft insertion portion 62a and the flange portion 62b, the supported member 2 can be supported in a floating state with respect to the support member 1,
A thin-walled bulge portion 62c is formed so as to project outward in the axial direction in a donut shape.

In the conventional liquid-filled damper 60, when the viscous fluid 65a is filled in the storage space 65 of the container portion 61, the bulge portion 62c is projected more outward than the opening adhesion end surface 61b, and therefore is shown in FIG. As described above, in assembling the liquid-filled damper 60, after the container portion 61 is filled with the viscous fluid 65a, the opening adhesion end surface 6 of the container portion 61 is
Since the lid portion 62 is bonded to 1b, the opening bonding end surface 61b of the lid portion 62 is
A large amount of air 65b is inevitably enclosed in the part protruding further upward. This air 65b lowers the vibration damping performance of the liquid-filled damper, and if the liquid-filled damper is used for a long period of time, the cap 62 of the air 65b is depressed and deformed, so that the support shaft insertion portion. There is a problem that the lower tip of the 62a and the bottom 61a come into contact with each other.

[Problems to be solved by the device]

The present invention has been made in view of the above problems, and it is possible to obtain a good damping effect by supporting a supported portion in a floating state on the support portion, and to pass one end of the container portion with a lid portion. A viscous fluid can be easily enclosed in the formed accommodation space to prevent air from being enclosed together when forming a viscous fluid-sealed damper, and this enclosed air generated by long-term use can be prevented. An object of the present invention is to provide a viscous fluid-sealed damper capable of suppressing the collapse deformation of the lid member due to air escape and maintaining an excellent damping effect for a long period of time.

[Means for Solving the Problems]

According to a first aspect of the present invention, a support shaft protruding in the horizontal direction is provided on a supported member, and the supported member supported by the support member by coil springs at a plurality of locations is floated on the support member using the support shaft. A viscous fluid-sealed damper for supporting in a state, which is formed of a thick rubber elastic body having an annular groove on the outer peripheral surface that can be fitted into a horizontally extending mounting hole provided in the supporting member, and has an annular shape at one end. A cylindrical container part having an open end face at the other end and a bottom part, and a rubber elastic body that adheres the outer peripheral edge part to the open end face of the container part and hermetically covers one end of the container part. The lid portion is composed of a viscous fluid enclosed in an accommodation space formed inside the container portion by covering the one end of the container portion with the lid portion. Provided on the supported member that has entered the space And a tubular support shaft insertion portion into which the support shaft can be fitted, and an annular thin portion connecting the support shaft insertion portion and the outer peripheral edge portion to the outer periphery of the support shaft insertion portion. The viscous fluid-sealed damper is configured such that a portion is within the annular opening end surface of the container portion and is formed into an annular bent portion having a V-shaped or U-shaped inward cross-section.

A second invention is that the supported member is a mechanical chassis for mounting an in-vehicle compact disc, and a viscous fluid-sealed damper is formed in which the annular thin portion has a thickness of 0.3 to 0.8 mm. is there.

[Action]

(Operation of the first invention) As described above, the present invention provides the viscous fluid-sealed damper,
Within the opening end face of the container part, the annular thin part formed between the outer periphery and the outer peripheral part of the support shaft insertion part having in the central part of the lid part,
Since the cross-section is formed in an annular bent portion that is bent inward in a V shape or a U shape, the container portion is filled with viscous fluid, and the outer peripheral edge portion of the rear lid portion is bonded to this opening end surface. As a result, when assembling the viscous fluid in the accommodation space, it is possible to prevent air from being entrapped together and also to support the supported member in a floating state on the support part, which is a vibration damping effect of the viscous fluid-sealed damper. Can increase
This excellent vibration damping effect can be maintained without deformation even when used for a long period of time.

(Operation of the second invention) Since the thin-walled portion is formed to have a thickness of 0.3 to 0.8 mm and the mechanical chassis to which the in-vehicle compact disc is attached is supported by the supporting portion in a floating state, in addition to the above-mentioned unique effect, Furthermore, when the compact disc for vehicles is mounted, the mechanical chassis can be supported in a more floating state on the support member, and the low frequency vibration transmitted from the vehicle body to the mechanical chassis can be effectively absorbed, and the sound skipping that occurs on the compact disc for automobiles can be achieved. Is less likely to occur.

〔Example〕

An embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a sectional view showing an embodiment of the present invention, in which 1 is a supporting member such as a chassis, a part of which is shown. The support member 1 is a frame for mounting a device such as a compact disc player (not shown) via vibration absorbing means. A supported member 2 such as a mechanical chassis to which a vehicle-mounted compact disc (not shown) is attached is supported by a plurality of coil springs (not shown) with respect to the support member 1, and liquid is sealed to absorb vibration. The damper 10 is interposed between the supported member 2 and the supporting member 1. The supported member 2 is supported in a floating state with respect to the support member 1 via a rod-shaped support shaft 11 that horizontally projects and is planted in the supported member 2.

The liquid-filled damper 10 includes a cylindrical container portion 12 and this container portion.
An outer peripheral edge portion 13b is bonded to the annular opening end face 12c of 12 to cover the opening, and a housing space 14 formed inside the container portion 12 by covering the opening of the container portion 12 with the lid portion 13.
It is composed of a viscous fluid 14a enclosed inside.

The container 12 has a bottom 12b on one side of a cylindrical body 12a that is thickly formed of a rubber material such as butyl rubber, and is formed into a container.

An end of the body 12a opposite to the bottom 12b has an opening.
It has an annular opening end face 12c for adhering the lid portion 13 to the end face of a. Then, the outer peripheral edge portion 13b of the lid portion 13 is bonded to the annular opening end surface 12c to cover the opening. Torso 1
An annular groove 12d is formed on an outer peripheral surface slightly below the end surface of 2a, and the annular groove 12d is fitted into a mounting hole 1a penetrating in the horizontal direction of the supporting member 1 so that the liquid filled damper 10 supports the supporting member 1. Is bound to.

The lid portion 13 has a cylindrical support shaft insertion portion 13a into which the support shaft 11 is fitted, and the support shaft insertion portion 13a is made to project into the accommodation space 14. An annular thin portion 13c curved inward in a V-shaped cross section is provided on the outer periphery of the support shaft insertion portion 13a, and the annular open end surface 12c of the container portion 12 is bonded to the outer periphery of the annular thin portion 13c. It has an annular outer peripheral edge portion 13b.

The lid portion 13 is formed of a rubber material such as butyl rubber so as to be softer than the container portion 12, and preferably, the thin portion 13c has a thickness of about 0.3 to 0.8 mm. If the thickness is 0.3 mm or less, the durability of the thin portion 13c is impaired, and if it is 0.8 mm or more, the vibration damping effect is reduced, and it is difficult to almost certainly prevent the skipped sound generated on the compact disc. And
When the lid 13 is bonded to the annular opening end surface 12c, the thin portion 1
3c is located inside the annular opening end face 12c, that is, bent into the accommodation space 14 at the same level as or more than the annular opening end face 12c.

The viscosity of the viscous fluid 14a enclosed in the accommodation space 14 is 1
A fluid such as silicone oil of 0 ³ c · St or more is used.

The viscous fluid 14a is sealed in such a manner that the container 12 is not covered with the lid 13 and the viscous fluid is injected into the container 12 flush with the annular opening end face 12c by a syringe such as a dispenser (not shown). After that, the outer peripheral edge portion 13b of the lid portion 13 is bonded to the annular opening end surface 12c.

The viscous fluid-sealed damper 10 of the present invention configured as described above
According to this, the thin portion 13c of the lid portion 13 is formed within the annular opening end surface 12c of the container portion 12.

Therefore, when the outer peripheral edge portion 13b of the lid portion 13 is adhered to the annular opening end surface 12c of the container portion 12 to cover the opening of the container portion 12 with the lid portion 13,
It is possible to prevent air from being enclosed in the accommodation space 14 formed inside the container portion 12.

Further, since the viscous fluid can be enclosed without any protrusion inside the container portion 12, the viscous fluid can be easily filled in a short time and the air is not enclosed.

Furthermore, since the thin portion 13c of the lid 13 is bent inward in a V-shaped cross section, the elasticity of the thin portion 13c itself becomes small, and the supported member 2 floats on the support member 1 (freely floats). Can be supported in a state), the support shaft insertion portion 13a enhances the stirring effect of the viscous fluid, and an excellent vibration damping effect can be obtained.

FIG. 2 is a sectional view showing another embodiment of the present invention.

In this embodiment, the lid of the viscous fluid-sealed damper 20 is used.
23, the upper surface of the support shaft insertion portion 23a in the central portion is the container portion 22.
Is located below the annular opening end face 22c. Lid 23
Has an annular thin portion 23c on the outer periphery of the support shaft insertion portion 23a, and further has an annular outer peripheral edge portion 23b on the outermost periphery of the outer periphery of the thin portion 23c. The annular thin portion 23c of this embodiment has a V-shaped cross section, is formed within the annular opening end surface 22b of the container portion 22, enters the accommodation space, and is bonded to the annular opening end surface 32c. There is.

FIG. 3 is a sectional view showing still another embodiment of the present invention.

In this embodiment, the viscous fluid-sealed damper 30 is used.
In the lid part 33 of the container part 32, the support shaft insertion part 33a at the center part thereof is
Is located below the annular opening end surface 32b. Lid 33
Has an annular thin portion 33c on the outer periphery of the support shaft insertion portion 33a, and further has an annular outer peripheral edge portion 33b on the outermost periphery of the outer periphery of the thin portion 33c. And this annular thin-walled portion 33c is formed such that the cross-sectional shape is such that a plurality of arcs are continuous, and the container portion
It is formed within the annular opening end surface 32c of 32, enters the accommodation space, and is bonded to the annular opening end surface 32c.

It should be noted that the present invention can be implemented in many forms. For example, the cross-sectional shape of the thin portion may be U-shaped or may be continuous and bent. The present invention can be implemented in many modes without departing from the gist of the present invention.

[Effect of device]

As described above, according to the present invention, the annular thin portion formed between the outer periphery and the outer peripheral edge of the support shaft insertion portion provided in the central portion of the lid portion is within the annular opening end surface of the container portion and has a cross section. Since it is formed in an annular bent portion that is bent inward in a V shape or a U shape, air is enclosed together with the viscous fluid in the accommodation space formed inside the container portion during assembly. It is possible to prevent this from happening and to support the supported portion in a floating state on the support portion, and it is possible to enhance the vibration damping effect, and it is possible to maintain this excellent vibration damping effect for a long period of time and enclose it in the accommodation space. It is also possible to reduce the amount of viscous fluid.

Desirably, by setting the thickness of the thin portion to 0.3 to 0.8 mm, it is possible to further reduce the vibration in the low frequency range, and by using this, it is possible to prevent the skipping of the sound from the vehicle-mounted compact disc.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an embodiment of the present invention, FIG. 2 is a vertical sectional view of another embodiment of the present invention, and FIG. 3 is a vertical sectional view of still another embodiment of the present invention. FIG. 5 is an explanatory view for explaining a usage state of the liquid-filled damper, FIG. 5 is a vertical sectional view of a conventional liquid-filled damper, and FIG. 6 is an explanatory view for explaining an assembled state of filling the liquid in the conventional liquid-filled damper. is there. DESCRIPTION OF SYMBOLS 1 ... Support member, 2 ... Supported member, 10 ... Viscous fluid enclosure damper, 11 ... Support shaft 12 ... Container part, 13 ... Lid part, 13c ... Thin part, 14a ... Viscous fluid

Claims (2)

[Scope of utility model registration request] 1. A support shaft provided in a horizontal direction on a supported member, and the supported member supported by the support member by a coil spring at a plurality of positions is in a floating state on the supporting member using the support shaft. A viscous fluid-sealed damper for supporting a thick rubber elastic body having an annular groove on its outer peripheral surface that can be fitted into a horizontally extending mounting hole provided in the supporting member, and has an annular shape at one end. A cylindrical container part having an open end face at the other end and a bottom part, and a rubber elastic body that adheres the outer peripheral edge part to the open end face of the container part and hermetically covers one end of the container part. The lid portion is composed of a viscous fluid enclosed in a storage space formed inside the container portion by covering the one end of the container portion with the lid portion. Installed on the supported member that has been inserted into the accommodation space. A cylindrical support shaft inserting portion into which the support shaft can be fitted, and an annular thin portion connecting the support shaft inserting portion and the outer peripheral edge portion to the outer periphery of the support shaft inserting portion,
The viscous fluid characterized in that the annular thin-walled portion is formed within the annular opening end surface of the container portion and is formed into an annular bent portion that is bent inward in a V-shape or U-shape. Enclosed damper. 2. The supported member is a mechanical chassis for mounting a vehicle-mounted compact disc, and the annular thin portion has a thickness of 0.3 to 0.8 mm. Viscous fluid filled damper.