JPH09329190A - Vibration control mount - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively suppress rotational fluctuating vibration regardless of such a state that a vibration control mount has soft spring characteristics so as to effectively insulate outside vibration, by providing an annular necking for attaching a supported part on a peripheral side and a bellows integrally formed on and under the annular necking. SOLUTION: A vibration control mount 1 is mounted on the peripheral side of a shaft 3 projected upward on a supporting member 2, and equipped with an annular necking 5 to which the mechanical chassis of a CD-ROM being a supported member 4 is attached on the peripheral side, and annular first and second bellows 6, 7 integrally formed on the lower and upper sides of the annular necking 5. Also, a stopper 9 is arranged by being opposed to a direction where rotational fluctuating vibration is applied which is generated by unbalance that a CD has, thereby spring characteristic is hardened only in this direction, and softened in a direction except for the above direction. Therefore, rotational fluctuating vibration can be effectively suppressed regardless of such a state that this vibration control mount has soft spring characteristic for effectively insulating outside vibration.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antivibration mount, and more particularly to an antivibration mount suitable for supporting an anti-vibration CD-ROM.

[0002]

2. Description of the Related Art When a CD-ROM was first manufactured, an anti-vibration mount for supporting this CD-ROM in an anti-vibration manner should continue to read data accurately from the CD even if external vibration acts from the personal computer side. A very soft spring characteristic was required to effectively insulate this vibration so that Therefore, this type of vibration proof mount has a structure as shown in FIG. 8, for example.

That is, the anti-vibration mount 1 is mounted on the outer peripheral side of a shaft portion 3 projecting upward from a supporting member 2, and is a mechanical chassis of a CD-ROM which is a supported member 4. An annular constricted portion 5 attached to the outer peripheral side, and a first bellows portion 6 integrally molded on the lower side of the constricted portion 5.
And the second bellows portion 7 integrally formed on the upper side of the constricted portion 5, and the whole is thinly made of a rubber-like elastic material.

However, the CD-ROM currently being studied in various fields has a CD rotation speed that is 2 times, 4 times, and 8 times faster than that of the initial one.
The vibration of the rotation fluctuation generated by the imbalance of D becomes large, so that the vibration transmission to the personal computer side has become a problem this time. In order to effectively suppress this rotational fluctuation vibration, it is necessary to harden the spring characteristic of the mount in the left-right direction (also referred to as the horizontal direction, the radial direction or the direction perpendicular to the axis) to suppress the vibration itself. As described above, since this type of anti-vibration mount requires very soft spring characteristics, it is difficult to achieve both at the same time.

[0005]

SUMMARY OF THE INVENTION In view of the above points, the present invention provides a protective device capable of effectively suppressing rotational fluctuation vibration despite having a soft spring characteristic for effectively insulating external vibration. The purpose is to provide a vibration mount.

[0006]

In order to achieve the above object, a vibration isolating mount according to claim 1 of the present invention is a vibration isolating mount mounted on an outer peripheral side of a shaft portion projecting upward on a supporting member. In a vibration-damping mount made of a rubber-like elastic material, which has an annular constriction part for mounting a supported member on the outer peripheral side and bellows parts integrally formed above and below the constriction part, the inner circumference of the constriction part The surface is provided with a stopper portion formed by thickening a part of the circumference of the constricted portion.

A vibration isolating mount according to a second aspect of the present invention is a vibration isolating mount mounted on the outer peripheral side of a shaft portion projecting from a supporting member, and a mechanical chassis of a CD-ROM is mounted on the outer peripheral side. In a vibration-proof mount made of a rubber-like elastic material having an annular constricted portion, on the inner peripheral surface of the constricted portion,
A stopper portion formed by thickening a part of the circumference of the constricted portion is formed.

[0008]

The action direction of the rotational fluctuation vibration generated by the imbalance of the CD is specified as shown by the arrow A in FIG. That is, since a certain position of the CD is slightly heavier than the other position, a force (vibration) is generated in the direction of arrow A by the centrifugal force centering on that position during rotation. Therefore, even if the spring constants of the anti-vibration mount in the left and right directions are not made hard, by making only the spring constant in the outer direction (centrifugal force direction) of the turntable 8 hard, rotation fluctuation vibration can be suppressed. Moreover, it becomes possible to keep the spring constant in the other directions soft as it is.
Therefore, the spring constant is hardened only in this direction by arranging the anti-vibration mount so that the stopper portion according to the present invention faces the above-mentioned arrow A direction.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION A stopper portion is integrally formed by thickening a part of the circumference of a constricted portion inward in the radial direction. At the time of mounting, the stopper is already in contact with the peripheral surface of the shaft when no vibration is applied.In this condition, make sure that a narrower gap is set between the stopper and the shaft than the others. May be.

[0010]

Next, an embodiment of the present invention will be described with reference to the drawings. It should be noted that this embodiment is a common embodiment for the invention according to claim 1 and the invention according to claim 2.

As shown in FIGS. 1 to 3, the vibration-proof mount 1 according to this embodiment is mounted on the outer peripheral side of a shaft portion 3 projecting upward from a support member 2, An annular constricted part 5 for mounting the mechanical chassis of the CD-ROM, which is the support member 4, on the outer peripheral side, an annular first bellows part 6 integrally formed on the lower side of the constricted part 5, and the constricted part 5
And an annular second bellows portion 7 integrally formed on the upper side thereof, and is entirely thin-walled with a rubber-like elastic material. In addition to this, on the inner peripheral surface of the constricted portion 5, a stopper portion 9 formed by thickening a part of the circumference of the constricted portion is formed integrally. The inner peripheral surface (front end surface) of the stopper portion 9 is formed into a coaxial curved surface so as to make surface contact with the peripheral surface of the shaft portion 3 when mounted.

The antivibration mount 1 having the above structure is a CD
The stopper portion 9 is arranged so as to face the direction of action of the rotational fluctuation vibration (leftward or rightward in FIG. 1) caused by the unbalance of the springs, which makes the spring characteristic hard only in this direction. Soften the spring characteristics in directions other than. Therefore, although the flexible spring characteristic is provided to effectively insulate external vibration, rotational fluctuation vibration can be effectively suppressed, and both requirements can be satisfied at the same time.

There are various methods of attaching the mount 1 to the shaft portion 3 as follows.

As shown in FIG. 4, a rigid plate 10 is fixed to the upper end portion of the shaft portion 3 with screws 11 to prevent the shaft 3 from coming off. A slight gap 12 is set between the upper end of the mount 1 and the plate 10 in the vertical direction. As shown in FIG. 5, an annular boss portion 13 is integrally formed on the upper end portion of the mount 1, and an annular mounting groove 14 is formed on the inner peripheral surface thereof.
Then, a plate 10 made of a rigid material is fitted therein, and the plate 10 is fixed to the upper end of the shaft portion 3 with a screw 11 to prevent it from coming off. As shown in FIG. 6, a plate 10 made of a rigid material is vulcanized and bonded to the upper end of the mount 1, and this is screwed to the upper end of the shaft 3 to prevent it from coming off. As shown in FIG. 7, a plate portion 15 is integrally formed on the upper end portion of the mount 1 so as to close the opening, and a rigid plate 10 is vulcanized and adhered to the upper side (outer side) thereof.
The retaining is performed by fitting the lower end portion of the mount 1 to the shaft portion 3.

[0015]

The present invention has the following effects.

That is, in common with the invention according to claim 1 and the invention according to claim 2, a supported member or a CD-R is provided.
Since the stopper part formed by thickening a part of the circumference of the annular constriction is provided on the inner peripheral surface of the annular constriction where the mechanical chassis of the OM is attached to the outer peripheral side, the spring characteristic is provided in a specific left-right direction. Is hard and the spring characteristics are soft in other directions. Therefore, by doubling the spring constant, external vibration can be effectively insulated and rotational fluctuation vibration can be effectively suppressed.

[Brief description of drawings]

FIG. 1 is a plan view of an anti-vibration mount according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line BB in FIG.

FIG. 3 is a sectional view taken along the line CC in FIG.

FIG. 4 is a cross-sectional view showing a mounted state of a vibration proof mount according to another embodiment of the present invention.

FIG. 5 is a cross-sectional view showing a mounted state of a vibration proof mount according to another embodiment of the present invention.

FIG. 6 is a cross-sectional view showing a mounted state of a vibration proof mount according to another embodiment of the present invention.

FIG. 7 is a cross-sectional view showing a mounted state of a vibration proof mount according to another embodiment of the present invention.

FIG. 8 is a cross-sectional view showing a mounted state of an anti-vibration mount according to a conventional example.

FIG. 9 is an explanatory diagram showing a usage state of the vibration proof mount and a vibration generation state.

[Explanation of symbols]

 1 Anti-Vibration Mount 2 Support Member 3 Shaft Part 4 Supported Member 5 Constriction Part 6, 7 Bellows Part 8 Turntable 9 Stopper Part 10 Plate 11 Screw Stop 12 Gap 13 Boss Part 14 Mounting Groove 15 Plate Part

Claims (2)

[Claims] 1. A vibration isolation mount (1) mounted on the outer peripheral side of a shaft portion (3) projecting upward from a support member (2), wherein a supported member (4) is mounted on the outer peripheral side. A vibration-isolating mount (1) made of a rubber-like elastic material, comprising: an annular neck portion (5) and bellows portions (6) (7) integrally formed above and below the neck portion (5), An antivibration mount characterized in that a stopper portion (9) formed by thickening a part of the circumference of the constricted portion (5) is formed on the inner peripheral surface of the portion (5). 2. A shaft portion (3) projecting from a support member (2).
Is an anti-vibration mount (1) mounted on the outer peripheral side of
An antivibration mount made of a rubber-like elastic material having an annular constriction (5) for mounting a mechanical chassis of a D-ROM on an outer peripheral side, wherein the constriction (5) is provided on an inner peripheral surface of the constriction (5). An anti-vibration mount, characterized in that a stopper portion (9) formed by thickening a part of the circumference of the is formed.