JP3432100B2 - Anti-vibration rubber member - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] TECHNICAL FIELD The present invention relates to a vibration-proof rubber member.
Especially for electronic information storage on optical disks, magneto-optical disks, etc.
Suitable for use as anti-vibration means in storage media drives
The present invention relates to an anti-vibration rubber member. [0002] 2. Description of the Related Art For example, a CD (compact disk),
LD (laser disk), DVD (digital video
Optical disks such as discs, MO, MD (mini
Electronic information storage media such as magneto-optical disks
Drive for writing or reading electronic information to / from
Is used to write or read the above electronic information.
In order to prevent the influence of
You. [0003] The vibration-proof rubber member 91 is, for example, shown in FIG.
As shown, an outer casing 31 of the driving device 3 is connected to an electronic information storage medium.
Built-in drive unit 32 for body 2 and read / write unit 33 for electronic information
Used by being interposed between the inner casing 34
And the following formula (ii): T = a_OUT/ A_IN    (ii) [Where a_INIs the vibration of the vibration input side (for example,
Acceleration, a_OUTIs the vibration on the vibration output side (for example, the inner housing side).
It shows the acceleration of motion. ] Is small,
It is required that it is difficult to transmit vibration, especially
In the response magnification at the resonance frequency f0 of the vibration isolating rubber member itself,
A certain resonance magnification T (f0) needs to be small. [0004] In the above driving device, especially,
It is necessary to prevent vibration of the information reading and writing
Resonance frequency of relatively hard member used for writing section
Since the number f1 is about 50 to 200 Hz,
Reduce the response magnification T (f1) in such a frequency range.
Is required. To achieve this, the resonance of the rubber
What is necessary is just to make frequency f0 small. That is, as shown in FIG.
In addition, the resonance frequency f0 of the vibration isolating rubber member is reduced to f0 '.
Then, the response at the resonance frequency f1 of the member of the read / write unit is obtained.
Decrease the answer magnification T (f1) to T (f1 ')
Can be. Reducing the resonance frequency f0 of the vibration isolating rubber member
In this case, the anti-vibration rubber member may be softened. [0005] [Problems to be solved by the present invention]
The above drive unit, which was dedicated, is
It was considered to be able to place
Vibration rubber member exhibits the above-mentioned anti-vibration performance only when placed horizontally
It is designed to be installed vertically.
In this case, the same vibration isolation performance as above can be achieved.
I didn't come. [0006] In other words, the conventional anti-vibration rubber member is shown in FIG.
When the drive unit 3 is placed horizontally as shown in the figure, the electronic information storage
A direction perpendicular to the surface of the storage medium 2 (direction of arrow H1 in the figure);
A reading perpendicular to the direction of H1 and indicated by arrow M1 in the figure.
The direction parallel to the moving direction of the writing unit 33 (the direction indicated by the arrow H2 in the drawing)
Direction), and a direction orthogonal to both directions of H1 and H2.
(Direction of arrow H3 in the figure)
Vibration frequency [f0 each_H1, F0_H2And f0_H3
However, in any case, the
Although it is designed to be enclosed, as shown in FIG.
When the drive unit 3 is placed vertically, it corresponds to the above three directions
Resonance frequency in each of the directions V1, V2, V3
0_V1, F0_V2And f0_V3Shall be the above range
It can deviate greatly from the surroundings and exhibit sufficient vibration isolation performance
There is no. According to the study by the inventors, the vibration-proof rubber member is
The resonance frequency f0 in the above six directions_H1~ F0_H3And f0
_V1~ F0_V3Maximum value f0 of_maxAnd the minimum value f
0_minDifference f0 from_max-F0_minIs within 20Hz
The same vibration damping performance in both horizontal and vertical
Can conduct. However, all of the conventional anti-vibration rubber members
At present, the above conditions cannot be satisfied. Further, as described above, the resonance of the vibration isolating rubber member
The smaller the frequency f0, the better,
The rubber member may be softened.
The amount of flexural deformation of the anti-vibration rubber member due to
The case and outer case come into contact, and the rubber vibration insulator does not function
There is also a possibility that the problem of nodding may occur. In particular, conventional
The vibration rubber member is only for horizontal placement as described above,
Because it was not considered to be placed vertically, it was placed vertically
Large deflection due to the load,
As a result of bending or deformation, the connection between the inner casing and the outer casing as described above
It was easy to touch. Therefore, the occurrence of various problems as described above has been considered.
In order to prevent this, as shown by the broken line in FIG.
Is interposed between the outer casing 31 and the inner casing 34.
Is considered, but in this case, the number of parts
Increased manufacturing man-hours led to reduced productivity
In addition, there is a problem that manufacturing costs are increased. This
An object of the invention is, for example, a drive device for an electronic information storage medium.
When used as vibration prevention means in
Good vibration isolation in both horizontal and vertical orientations
To provide a new vibration-proof rubber member that can exhibit performance
It is in. [0010] Means for Solving the Problems To solve the above problems,
First of all, the present inventors first made a conventional anti-vibration rubber member.
The cause of the large variation in the resonance frequency in the six directions was investigated.
Debated. As a result, the drive can be placed horizontally or vertically.
The direction of the load applied to the anti-vibration rubber member
May cause fluctuations in the spring constant of the vibration-isolating rubber member.
Was found to be the cause of the above. That is, the conventional anti-vibration rubber member 91 is shown in FIG.
(a) As shown in (b), a fixing part to the outer casing 31 is provided at the center thereof.
Through hole 91a, and the inner casing 34
Provided with a groove 91b as a holding portion for holding
In the case of horizontal installation, it is indicated by an arrow W1 in FIG.
Thus, the load in the direction parallel to the direction of the central axis of the through hole 91a is
State in which the groove 91b is added to the lower side surface 91c.
Then, since vibrations are applied in the three directions of H1 to H3,
Considering the direction of the load and vibration, resonance at that time
Frequency f0_H1~ F0_H3Is the range that satisfies the characteristics described above.
Inside the through-hole 91a of the vibration-proof rubber member 91 so as to be enclosed.
The spring constant in the direction parallel to the direction of the center axis is set. However, in the case of the vertical installation, the case of the horizontal installation
In contrast, as shown by an arrow W2 in FIG.
The load in the direction orthogonal to the direction of the central axis of
In addition to the above-mentioned V1-V
Vibration is applied in three directions (3).
91 does not consider the direction of the applied load and vibration
Therefore, in this state, the spring constant in the same direction as above fluctuates.
And the resonance frequency f0_V1~ F0_V3However, the characteristics described above
Greatly deviates from the range in which is satisfied. Therefore, the inventors have proposed the above-mentioned vibration-proof rubber member.
In order to suppress the variation of the resonance frequency in the six directions,
Between horizontal and vertical positions.
Check that the range of fluctuation of the spring constant of the rubber member is specified.
And as a result, the difference f0_max−f
0_minFluctuation of spring constant that can be set within 20Hz
And completed the present invention. That is, the vibration-proof rubber member of the present invention
Part having a through hole as a fixing part to the first member
It is formed in a cylindrical shape and has a second portion
A holding portion is provided for holding the material in a non-contact state with the first member.
And is interposed between the first and second members.
A vibration-proof rubber member for vibration-proofing between the two members,Through
On the inner peripheral surface of the hole, a plurality of
Rubber grooved member whose both ends have through holes
Formed in a closed state so as not to reach both end faces of the
And (a) A direction perpendicular to the direction of the central axis of the through hole
The above load, measured with the load
Direction that is parallel to the direction of
A direction parallel to the direction of the central axis of the hole and orthogonal to the above two directions
Spring constants in three directions, and (b) The holding portion has a through hole parallel to the direction of the central axis of the through hole.
The above load, measured with the load applied
Direction and the direction parallel to the above direction, and orthogonal to the above direction, and (a)
The direction parallel to the direction of the load and the direction perpendicular to the above two directions
Of the six types of spring constants in the three directions
Maximum value K_maxAnd the minimum value K_minAnd formula (i): 1 ≦ K_max/ K_min  ≤3.24 (i) Is satisfied. According to the above configuration, as described above, the anti-vibration
Difference f0 of resonance frequency in six directions of rubber member_max-F0
_minCan be set within 20 Hz.
The vibration rubber member is used, for example, in a drive device for an electronic information storage medium.
The outer case as the first member and the second member
When used as a means of preventing vibration between the
Good protection in both horizontal and vertical positions
The vibration performance can be exhibited. Incidentally, the ratio K of the spring constant under the above-mentioned two load conditions is shown.
_max/ K_minIs limited to a range of 3.24 or less
When the above ratio exceeds 3.24, 6
Direction difference f0_max-F0_minIs 20H
This is because z is exceeded. In addition, the above ratio is limited to 1 or more.
What is determined is the maximum value of the spring constant K_maxAnd the minimum value K
_minAnd the ratio K_max/ K_minIs less than 1
It is impossible. The above-mentioned spring constant ratio K_max/ K_minIs
Reduce the variation of the resonance frequency of the vibration isolating rubber member in six directions.
Considering that the size of the layer should be smaller,
Is preferably 2.40 or less, more preferably 2.00 or less.
More preferably, Spring constant ratio K_max/ K
_minIs defined to be 2.40 or less, 6
Direction difference f0_max-F0_min15H
z or less, and if it is 2.00 or less,
Since the frequency can be set to 10 Hz or less, even better protection can be obtained.
Vibration performance can be demonstrated. Spring constant ratio K_max/ K_minThe above
To be within the range, one or both of the loads
The spring constant in each direction of the anti-vibration rubber member in the
To adjust the spring constant, for example, (1) Hard member acting in either one of the load directions
Embedded in a vibration-proof rubber member, (2) Apply two or more rubbers with different hardness in one load direction
Distributed in the vibration isolating rubber member to act, And so on. However, in the present invention, the direction of the center axis of the through hole
When a load is applied in the direction parallel to
The spring constant is set as before, and the center of the through hole
When a load is applied in the direction perpendicular to the axis direction (vertical
(Corresponding to the state of the above), satisfying the above equation (i).
AdjustTo, Multiple grooves on the inner peripheral surface of the through hole
FormTo. According to such a configuration, it is formed between each groove.
When the load is applied in the vertical position,
By functioning as
Adjusted. Therefore, a separate member is required as in (1) above.
And does not require two or more types of rubber as in (2)
In order to simply form a vibration-proof rubber member using a single rubber
By changing the shape of the mold,
Can achieveTo. Further, as described above, the structure of the ridge between the grooves is used.
The function of the spring in the vertically installed state
When the rubber is added, the anti-vibration rubber member itself becomes extremely soft
Buckling of the vibration isolating rubber member due to load
And reduce the amount of flexure deformation.To. With the above groove
Vertical grooves along the direction of the central axis of the through hole, and
A typical example is a horizontal groove along the circumference of the hole.
It is. [0022]However, in the present invention,Smell in vertical position
The load on the inner housing over a long period of time
When you continue to use, the ridges
Creep deformation in the form of falling down
To preventAnd theAnti-vibration goose with open through holes at both ends
Closed so that it does not reach both ends of theInside the through hole
A vertical groove is formed along the direction of the center axis. In other words, the vertical groove is a vibration-proof device having a through hole.
If it is formed to reach both end surfaces of the rubber member,
Each of the ridges provided between the grooves is independent.
Therefore, the size and shape of the ridge or vibration-proof rubber member
Depending on the conditions such as the hardness of the rubber that constitutes
When a long-term load is applied, the ridges move laterally (perpendicular to the groove).
Creep deformation in the form of
is there. And when such creep deformation occurs, the impact
When a load is applied, the inner case and the outer case
In severe cases, the inner case and the outer case
Is in constant contact with the
The anti-vibration function may be lost. On the other hand, a vertical concave groove has a through hole opened.
When closed so that it does not reach both end surfaces of the vibration isolation rubber member
The convex ridges between the grooves are connected to each other near the opening of the through hole.
And the rigidity of each ridge increases.
In addition, the above-mentioned connecting part receives the load together with the ridge.
Function to reduce the burden of each ridge.
And the above creep deformation can be more reliably prevented.
It is. [0025] BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an anti-vibration rubber member of the present invention will be described.
Will be described with reference to the drawings showing an example of the embodiment.
I do. As shown in FIG. 2A, the anti-vibration rubber member 1 of this example
Stores the electronic information on the electronic information storage medium 2 such as the optical disk.
An outer casing 31 of the driving device 3 for writing or reading
Information storage medium drive unit 32 and electronic information read / write unit 33
It is also used by being interposed between
It is. The vibration-proof rubber member 1 is shown in FIG.
As shown in FIGS. 1 (a) and 1 (b), a bolt for fixing to the outer casing 31 is used.
A cylindrical body 11 having a through hole 11a through which the
This cylinder 11 was provided at a position in the middle of the length direction,
A disk shape having a diameter larger than that of the cylindrical body 11 and an outer peripheral surface thereof
Then, the periphery of the mounting hole 34a of the inner casing 34 is fitted to
The peripheral groove 12 as a holding portion for holding the inner casing 34
The large-diameter portion 12 on which a is formed is integrally formed with vulcanized rubber
It is composed of The anti-vibration rubber member 1 is shown in FIG.
Thus, the peripheral portion of the mounting hole 34a of the inner casing 34 is
Of the hard tube 5 in the through hole 11a.
And apply a washer 42 to the upper end of the cylindrical body 11.
At the same time, the lower end of the cylindrical body 11 is
In a state where it is applied to the place where the hole 31a is formed,
Bolt 41 into the washer 42, the tube 5, and the screw hole 31a.
Of the bolt 41 inserted through and further protruding outside the outer casing 31
By screwing the nut 43 to the tip and tightening it,
It is interposed between the case 31 and the inner case 34. The tube 5 includes a bolt 41 and a nut 4
3 When tightening, keep the tightening distance constant.
In order to stabilize the vibration-proof performance of the vibration-proof rubber member 1,
Used for That is, the tube 5 is prevented as shown in the figure.
It is the same length as the cylindrical body 11 of the vibration rubber member 1, or
Formed of a hard material, such as metal, with a slightly shorter length than
When the bolt 41 and the nut 43 are tightened,
Acts as a stopper. In the former case, both
Prevents the tightening force from reaching the anti-vibration rubber member 1 and
In the case of the
Acts to stabilize the vibration-proof performance of the vibration-proof rubber member 1 even in the case of displacement.
To Up to this point, the same as the conventional anti-vibration rubber member
Configuration. The vibration-proof rubber member 1 of this example is different from the conventional one.
The difference between the two is that the spring constant
By adjusting the spring constant ratio K_max/ K_minMentioned earlier
The through-hole 1a is provided on the inner peripheral surface of the through-hole 11a so that
A plurality of vertical grooves 11b along the direction of the central axis
1 (b): 12)
You. That is, a plurality of the above-mentioned plural
By providing the vertical grooves 11b, between each groove 11b
When the formed ridge 11c is vertically
By acting as a spring when it is added, the vibration-proof rubber part
The spring constant of the material 1 in a vertically placed state is adjusted. Ma
In the above mechanism, the cross-sectional shape of the ridge 11c is
It is closely related to the spring constant in the state where it is placed. Especially
FIG. 1 is an element that defines the cross-sectional shape of the ridge 11c of FIG.
The width A of the groove 11b shown in FIG.
b, the ratio D / A to the distance D, and the distance D
It is possible to adjust two ratios of the depth L of the groove 11b and the ratio D / L.
Thus, the spring constant in the vertically placed state can be finely adjusted. A suitable number of the above ratios D / A and D / L
Although the value range is not particularly limited, the ratio D / A is
Within the range of 0.5 to 5, the ratio D / L is within the range of 0.1 to 5.
Preferably it is. If the ratio D / A is less than the above range, the phase
In contrast, the width A of the concave groove 11b is large, that is, the adjacent convex
Because the distance between the strips 11c becomes large,
The area receiving the load becomes smaller, and
However, the amount of flexural deformation of the rubber
May be affected. In addition, long-term load in the state of vertical installation
When it joins, the ridge 11c hangs down in the horizontal direction.
Leap deformation may occur. On the other hand, when the ratio D / A exceeds the above range
Since the width A of the concave groove 11b is relatively small,
Due to deformation when receiving a load in the vertical position,
Ridges 11c come into contact with each other as independent springs
The function may be lost and the resonance frequency may become unstable.
When the ratio D / L is less than the above range, the ridge 11c is vertically long.
Becomes too deformed when subjected to a load in the vertical position
In some cases, the ridge 11c is buckled and deformed.
Doing so, also in the vertical position, vibration isolation by load
The amount of flexural deformation of the rubber member increases, or
When a long-term load is applied in the standing state, the ridge 11c
Is creeping in the form where
There is. On the other hand, when the ratio D / L exceeds the above range
The height of the ridge 11c is too low, and the
It is crushed when receiving heavy weight and functions as a spring
May be lost.In the example of the figure,Through hole 11a
The two ends of the vertical groove 11b provided on the inner peripheral surface of the
On both end surfaces 1a and 1b of the vibration-proof rubber member 1 having the opening 1a
Close not to reachIt is. [0034]ThisBetween the concave grooves 11b as described above.
Are formed near the opening of the through hole 11a.
It is connected to each other by the connection portion 11d, and
The rigidity of each ridge 11c is improved, and the connecting portion 11d
Functions to receive the load together with the ridge 11c.
It is possible to reduce the burden of each convex strip 11c.
You. Therefore, especially in the vertical state,
11c, the load of the inner casing 34 acts for a long period of time.
When attached, the ridge 11c falls down in the horizontal direction.
The advantage that creep deformation can be more reliably prevented.
There is. In the above configuration, the width B of the connecting portion 11d
And a distance H between both end surfaces 1a and 1b of the vibration-proof rubber member 1.
The width B and the width B are set so that the ratio B / H is 0.35 or less.
It is preferable to set the distance H. The ratio B / H is in the above range
Is larger than the inner diameter of the through hole 11a.
The region where the groove 11b and the ridge 11c are formed is narrow.
The vertical position described above due to the ridge 11c
The function to adjust the spring constant at
Number ratio K_max/ K_minIs likely to exceed the above range.
There is. It should be noted that the inner casing due to the aforementioned creep deformation
To surely prevent the contact with the outer casing,
Creep deformation is 1.5mm or less, especially 1.0mm or less
Preferably, the latter is the latter, creep deformation
In order to achieve the amount of 1.0 mm or less, the lower limit of the ratio B / H is required.
Is preferably 0.08. Ratio B / H is less than 0.08
When full, the width of the connecting portion 11b is too small,
b, the effect of reinforcing the ridge 11c described above is sufficient.
No, the amount of creep deformation of the anti-vibration rubber member 1 is 1.0 m
m. The vibration-proof rubber member 1 is made of a substrate
The rubber composition obtained by blending various additives with the rubber
It is manufactured by vulcanizing and molding in a mold having a shape.
You. As the base rubber, conventionally known various rubbers are used.
Although the displacement can be used, the vibration-proof rubber member
Used for a long time, etc.
It is required to have excellent aging properties.
Excellent, and the resonance magnification T (f0) is small.
Isobutylene and par
Brominated copolymer with lamethylstyrene (hereinafter referred to as “EM
DX) is preferably used as the base rubber.
New [0038] EMDX is combined with isobutylene as described above.
It is manufactured by brominating a copolymer with paramethylstyrene.
Isobutylene and
The copolymerization ratio of butyl styrene was 99: 1 to 85:85 by weight.
It is about 15. Bromine is mainly derived from paramethylstyrene.
Probably substituted with one of the hydrogens of the methyl group of the len
And the bromine content is 0.6 to 2.0 of the total polymer weight.
% By weight. The above EMDX has the same structure as butyl rubber.
By the action of a certain isobutylene unit, its loss
Since the number tan δ is large, the resonance magnification T
(F0) is small and excellent in damping vibration
You. In addition, EMDX has ozone deterioration and
Ozone resistant because it has no double bonds that cause aging
And excellent aging resistance. As a specific example of such EMDX,
Although not limited, for example, Exon Chemical Co., Ltd.
XXPRO EMDX 90-10, EMDX 89-
4 and the like. As the base rubber, the above-mentioned EMD
X may be used alone, but it is co-vulcanized with EMDX during vulcanization.
Other rubbers that do not interfere with the properties of EMDX described above
You may use together in the range. Other rubbers used with EMDX
For example, natural rubber (NR), butadiene rubber
(BR), isoprene rubber (IR) and styrene-butane
Tadiene copolymer rubber (SBR) and the like. As the base rubber, the above-mentioned EMDX system is used.
Instead, as described above, various other known base materials may be used.
Can also be used. As such other base rubber
May be the above-mentioned NR and BR, for example, urethane
Rubber (U), chloroprene rubber (CR), ethylene rubber
Propylene-diene copolymer rubber (EPDM), no sole
Rubber, silicone rubber, butyl rubber (IIR), d
Tylene-propylene copolymer rubber (EPM), silicone
-Ethylene-propylene mixed rubber (SEP), chloros
Rufonated polyethylene, acrylonitrile-butadiene
And copolymer rubber (NBR). These are each
Used alone or in combination of two or more
You. As described above, the base rubber is the same as the conventional rubber.
In addition, vulcanizing agents, vulcanization accelerators, vulcanization accelerators, vulcanization retarders,
Reinforcing agent, filler, softener, plasticizer and other various additives
May be blended as necessary. Of the above, vulcanizing agents
The other vulcanization-based additives depend on the base rubber used.
Use a combination suitable for vulcanizing the base rubber
Is good. For example, the EMDX base rubber is
Vulcanization with a combination system of vulcanizing agent and vulcanization accelerator
Can be Sulfur is used as the above vulcanizing agent.
N, N'-diphenyl-p-phenylenediamine
, N- (1,3-dimethylbutyl) -N'-phenyl
Amines such as p-phenylenediamine or
Uses resin such as alkylphenol formaldehyde resin
You can also. As the vulcanization accelerator, for example, 2-merca
Putbenzothiazole, dibenzothiazyl disulfide
And other thiazoles; tetramethylthiuram disulfi
, Tetraethylthiuram disulfide, tetrabutyl
Thiuram disulfide, dipentamethylene thiuramte
Thiuram-based vulcanization accelerators such as rasulphide; dimethyldithi
Iron carbamic acid, zinc dimethyldithiocarbamate,
Copper dimethyldithiocarbamate, diethyldithiocarba
Zinc formate, zinc dibutyldithiocarbamate, ethyl
Dithiocarbamines such as zinc phenyldithiocarbamate
Acids and the like. In addition, the above-mentioned combination system contains a sub-oxide
Vulcanization accelerators such as lead and stearic acid may be used in combination.
In the above combination system, the total amount of the vulcanizing agent and the vulcanization accelerator is
Or a combination of a vulcanizing agent, a vulcanization accelerator and a vulcanization accelerator.
In total, 1 to 20 parts by weight based on 100 parts by weight of the base rubber
It is preferable to mix in the range. The EMDX-based base rubber is used in the above-described processing.
Combined use of zinc oxide and stearic acid, which are sulfur promotion accelerators
Vulcanization is also possible, and this system is used in combination with the vulcanization accelerator described above.
You may. In the above combination system, the compounding amount of zinc oxide is
0.1 to 15 parts by weight based on 100 parts by weight of the base rubber
Preferably 1 to 5 parts by weight.
No. The amount of stearic acid is 100% by weight of the base rubber.
0.1 to 20 parts by weight per part by weight,
More preferably, it is 0.5 to 3 parts by weight. In each of the above vulcanization systems, scorch and the like are prevented.
A vulcanization retarder may be added to stop the reaction. Vulcanization retarder
Examples include hydrotalcite (Mg-Al high
Drottal Site, Kyowa Chemical Industry Co., Ltd. DHT 4A-
2) and the like. The amount of such a vulcanization retarder is based on
0.1-5 parts by weight for 100 parts by weight of rubber
And more preferably 0.5 to 3 parts by weight.
No. As a reinforcing agent, mainly carbon black
Is used. Conventionally known as carbon black
Any of various grades of can be used,
Furnace black which belongs to furnace black
FEF, GPF, SRF or thermal black
(FT, MT) increases the resonance magnification T (f0)
Without causing bleeding of the softener described below
Without vulcanizing rubber, soften the vibration
Since the frequency f0 can be reduced, it is preferably used. The amount of the carbon black to be added depends on the base material.
It is preferably 5 to 60 parts by weight based on 100 parts by weight of rubber.
More preferably, it is 20 to 40 parts by weight.
The rubber composition contains other supplements other than the above carbon black.
You may mix | blend a strong agent and a filler. Such other reinforcing agents,
Examples of fillers include silica, calcium carbonate,
Magnesium silicate, clay, zeolite, barium sulfate
, Lithopone, titanium oxide and the like. The amounts of the other reinforcing agents and fillers are total
In 100 parts by weight or less of base rubber 100 parts by weight
And more preferably 50 parts by weight or less.
Good. Examples of the softener include fatty acids (stearin
Acid, lauric acid, etc.), cottonseed oil, tall oil, asphalt
Substances, vegetable oils, mineral oils,
Various known softeners of synthetic and synthetic types can be used.
And paraffin oil is particularly suitable
You. The amount of the softener is 100 parts by weight of the base rubber.
And preferably 20 to 40 parts by weight with respect to
More preferably, it is 30 parts by weight. Also said rubber
In addition to the above, the composition includes, for example, resin and rubber powder, medium
Empty particles, etc. may be blended.
Since it functions to reduce f0, it can be suitably used. As such a resin, for example, Coumalon®
Indene resin, phenol resin, high styrene resin, fat
And aliphatic petroleum resins. The amount of the resin
100 parts by weight or less for 100 parts by weight of rubber
More preferably, it is 3 to 50 parts by weight.
In addition, a foaming agent is added to the rubber composition to foam simultaneously with vulcanization.
The rigidity is reduced by forming the vibration-proof rubber member as a foamed structure.
Lower the resonance frequency f0.
Can also. As such a foaming agent, for example, sodium bicarbonate
Carbonates such as thorium and ammonium carbonate; N, N'-
Nitroso compounds such as dinitrosopentamethylenetetramine
Azo compound such as azodicarbonamide; p, p'-
Sulfur such as oxybis (benzenesulfonyl hydrazide)
And honyl hydrazide compounds. Blending of foaming agent
The amount is the amount of vulcanized rubber that can achieve the rigidity required for the product.
What is necessary is just to set suitably according to foaming. In order to manufacture the vibration-proof rubber member of the present invention,
First, using the above-mentioned components, for example, a closed kneader or the like
The unvulcanized rubber composition produced by kneading with
Prepared in a mold corresponding to the shape of the vibration rubber member, and
The rubber composition may be vulcanized by heating. Note that the present invention
The shape of the anti-vibration rubber member is limited to the above-mentioned figure.
Can be changed as appropriate to the anti-vibration structure, etc.
You. For example,Fig. 3 (a) and (b)Large diameter part 1
2 is omitted, the diameter of the cylindrical body 11 is increased,
The circumferential groove 12a may be formed directly on the outer peripheral surface of the groove 11.. [0056] The present invention will now be described based on examples and comparative examples.
Will be explained. Example 1 <Preparation of rubber composition> EMDX as base rubber [Exxon Chemical Co., Ltd.
EXXPROEMDX 89-4] 100 parts by weight
And carbon black [furnace bra
GPF] 30 parts by weight and paraffin as a softener
Oil [Diana Process Oil P manufactured by Idemitsu Kosan Co., Ltd.
W-380] 30 parts by weight and each of the following components were mixed in a closed system.
The rubber composition was prepared by kneading with a kneading machine. [0057] (Component) (Blending amount) ・ Vulcanizing agent 1 part by weight of sulfur ・ Vulcanization accelerator 2 parts by weight of dibenzothiazyl disulfide ・ Vulcanization accelerator 2 parts by weight zinc oxide 1 part by weight of stearic acid <Manufacture of anti-vibration rubber members> The above rubber composition was charged in a mold, and the vulcanization temperature was 160 ° C.
Vulcanized for 20 minutes to obtain the shape shown in Fig. 1 (a) and (b).
And the outer diameter X1 of the large diameter portion 12 is 14 mmφ, and the cylindrical body 1
1 has an outer diameter X2 of 8.8 mmφ, and the inner diameter X3 of the through hole 11a
5.2 mmφ, width A of vertical concave groove 11b is 0.7 mm, depth
Is 0.5 mm, and the distance D between the adjacent grooves 11b is
0.66mm, BothThe distance H between the end faces 1a and 1b is 12 mm
soSo that both ends of the concave groove 11b do not reach both end surfaces,
It has a shape closed by the connecting portion 11d having a width B = 2.0 mm.
YouA vibration-proof rubber member was manufactured. [0058]Examples 2 to 6 Using the same rubber composition as in Example 1, shown in FIGS. 1 (a) and 1 (b)
It has a shape, an outer diameter X1 of the large diameter portion 12, and a
Outer diameter X2, inner diameter X3 of through hole 11a, width of vertical concave groove 11b
A, depth L, distance D between adjacent concave grooves 11b, and
The distance H between the end faces 1a and 1b is the value shown in Table 1, respectively.
An anti-vibration rubber member was manufactured. The vulcanization was performed in the same manner as in Example 1.
Performed under the same conditions. [0059]Example 7 Using the same rubber composition as in Example 1,Fig. 3 (a) (b)Shown in
It has a shape, and the outer diameter X2 of the cylindrical body 11 is 14 mmφ,
The inner diameter X3 of the through hole 11a is 5.2 mmφ, and the vertical concave groove 11b is provided.
Has a width A of 1.3 mm and a depth L of 3.0 mm.
The distance D between the concave grooves 11b is 0.66 mm, BothEnd faces 1a, 1
If the distance H between b is 12mmAnd both ends of the concave groove 11b are both
The connecting portion 11 having a width B = 2.0 mm so as not to reach the end face.
has a shape closed by dA vibration-proof rubber member was manufactured.
The vulcanization was performed under the same conditions as in Example 1. [0060]Example 8 Except that the width B of the connecting portion 11d was set to 0.5 mm.
The same as in Example 1, except that the other components are the same as those of Example 1.
A rubber member was manufactured. Comparative Example 1 Using the same rubber composition as in Example 1, a recess was formed in the through hole 11a.
Except not having the groove 11bExample 5Same shape and size as
The vibration-proof rubber member of the method was manufactured. The vulcanization was performed in the same manner as in Example 1.
Performed under the same conditions.Comparative Example 2 Implemented except that the width B of the connecting portion 11d was 4.8 mm
The same as in Example 1, except that the other components are the same as those of Example 1.
A rubber member was manufactured. The protection manufactured in each of the above examples and comparative examples.
The following tests were conducted on the rubber vibration member,
Was evaluated. Evaluation of anti-vibration characteristics Four anti-vibration rubber members 1 manufactured in each of Examples and Comparative Examples
As shown in FIG. 4, the drive of the aforementioned electronic information storage medium is
Rectangular plate 6 corresponding to the inner casing and outer casing of the moving device
1 and 62 at the four corners,
Dell configured. That is, the vibration isolating rubber member 1
Attachment of the plate 61 is performed in the same manner as the inner casing of the drive unit.
The peripheral edge of the attachment hole (not shown) is formed in the peripheral groove 12a of the large diameter portion 12.
The attachment to the plate 62 is also performed by driving
As with the outer casing of the device, the through hole 11a has the same shape as the cylindrical body 11.
Insert a hard tube (not shown) with a length
Apply a washer 42 to the upper end of the tube of
A screw hole (not shown) of the plate body 62 is formed at the lower end of the probe.
The above tube and washer
The bolt 41 is inserted through the screwer 42 and the screw hole,
A nut 43 is screwed onto the tip of a bolt 41 that projects
I went by attaching. Each of the plate members 61 and 62 has
Attach accelerometers 71 and 72 for measuring vibration,
In the plate body 62 on the vibration input side, the plate body 62 is
As shown by the white arrow, the vertical oscillation
The vibrator 73 is attached, and the accelerometers 71 and 72 are attached.
And the vibrator 73 are respectively subjected to FFT (Fast Fourier transformation).
(Exchange) Connected to the data processor 83. The FFT data processor 83 includes an accelerometer
Sensed by 71, 72 and via amplifiers 81, 82
By processing the raw data of the input vibration, the acceleration of the vibration,
While obtaining the frequency and the like, the vibrator 73 is
For controlling to vibrate at a predetermined acceleration and frequency
Things. Next, one anti-vibration rubber member is formed from the plate 61.
Condition of load 180gf applied to 1 and measurement temperature 23 ° C
Below, the drive model should be in horizontal or vertical position.
While using the FFT data processor 83,
The plate body 62 on the vibration input side vibrates under the following conditions.
Plate 62 when vibrated while controlling the
The vibration of the plate 61 on the vibration output side is
2 sensed. <Vibration conditions> Acceleration: 0.35G (fixed) Vibration frequency: 5 to 500 Hz (log sweep
Shaken) Vibration waveform: sine wave The vibration detected by the accelerometers 71 and 72
Is processed using the FFT data processor 83 described above.
The vibration-absorbing rubber member 1 is placed horizontally and vertically.
Then, the above-described spring constants in the six directions are calculated.
Neither constant ratio K_max/ K_minI asked. From the raw data, the vibration-proof rubber member 1
Calculate the resonance frequency f0 in the horizontal and vertical
Out, the maximum value f0_maxAnd the minimum value f0_minDifference f
0_max-F0_minI asked. Deflection measurement The above-mentioned drive model was placed horizontally and vertically.
Deformation amount δH of the vibration isolating rubber member (horizontal, m
m) and δV (vertical setting, mm)
180 gf load applied to the vibration rubber member 1, measurement temperature 2
It was measured under the condition of 3 ° C. [0065]KMeasuring Leap Deformation The above-mentioned drive model was placed horizontally and vertically.
Vibration-proof rubber part after standing at 65 ° C for 200 hours
Material creep deformation δCH (horizontal placement, mm), δCV
(Vertical setting, mm), one vibration-proof rubber member from the plate 61
1 was measured under the condition of a load of 180 gf. The above result isTable 1,Table 2Shown in [0067] [Table 1] [0068] [Table 2]From the results of the above two tables, the vertical
A groove is provided, and both ends of the groove are connected with the ratio B /
The width B was set so that H was within the range of 0.35 or less.
By closing at the connection, the spring constant ratio K_max/ K
_minVibration-proof rubber portion of Examples 1 to 8 in which
All materials areNo spring groove ratio
K _max / K _min If Comparative Example 1 where 3.24 exceeds 3.24,
BiniA wide groove having a ratio B / H exceeding the above range is used for the concave groove.
Closed at the junction, the spring constant ratio K_max/ K_min
Exceeds the above range, the resonance frequency
Because the difference is as small as 20 Hz or less,
Set the storage medium drive horizontally or vertically.
It was also found that good vibration isolation performance can be exhibited. The anti-vibration rubber member of each of the above embodiments is not required.
In both horizontal and vertical positions, the load
The amount of deformation due to deformation is small and the amount of creep deformation is also small
Therefore, the contact between the inner and outer cases can be reliably prevented.
all right. In particular, the ratio B / H is 0.08 or more.
Anti-vibration rubber of Examples 1 to 8 in which the width B of the connecting portion is set as described above.
Creep deformation of all members, especially when placed vertically
The amount could be further reduced. Further, the anti-vibration rubber members of each embodiment are compared.
When, BaNeither constant ratio K_max/ K_minIs smaller,
Vibration frequency difference, especially the spring constant ratio K
_max/ K_minIs 2.00 or less, the resonance frequency
Can be reduced to 10 Hz or less, and the vibration isolation performance is further improved.
I also understood. [0072] As described above, according to the present invention,
For example, vibration in the drive of the electronic information storage medium
When used as a prevention means, the drive device is placed horizontally,
Good anti-vibration performance in any state of vertical installation
The unique effect of providing a vibration-proof rubber member
I do.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing an example of an embodiment of a vibration-proof rubber member of the present invention, wherein FIG. 1 (a) is a plan view and FIG. 1 (b) is a half-cut front view. It is. FIG. 2 (a) shows a case where the above-mentioned vibration-proof rubber member is used;
Sectional view showing an example of a drive device for an electronic information storage medium, FIG.
FIG. 4B is an enlarged cross-sectional view illustrating a mounting state of the vibration-proof rubber member in the driving device. FIG. 3 is a view showing another example of the embodiment of the vibration-proof rubber member of the present invention, wherein FIG. 3 (a) is a sectional plan view and FIG. 3 (b) is a half-cut front view. FIG. 4 is a view for explaining an apparatus used for evaluating the vibration-proof characteristics of a vibration-proof rubber member. FIG. 5 is a graph showing a relationship between a resonance frequency and a response magnification in a vibration-proof rubber member. FIG. 6 is a cross-sectional view of a driving device using a conventional vibration-proof rubber member. FIG. 7A is a diagram showing the direction of vibration when the driving device is placed horizontally, and FIG. 7B is a diagram showing the direction of vibration when the driving device is placed vertically. is there. FIG. 8 (a) is a view showing the load and the direction of vibration applied to the vibration isolating rubber member in a state in which the drive device is placed horizontally, and FIG. 8 (b) is a view in which the drive device is placed vertically. It is a figure which shows the load and the direction of a vibration which apply to a vibration-proof rubber member in a state. [Description of Signs] 1 Anti-vibration rubber members 1a, 1b End surface 11a Through hole 11b Groove groove 11d Connecting portion 12a Holding portion

──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Kazuhiro Fujisawa 402-1, Shibazaki, Hirano-cho, Nishi-ku, Kobe-shi, Hyogo Prefecture JP, U) JP-U 4-95137 (JP, U) (58) Fields surveyed (Int. Cl. ⁷ , DB name) F16F 1/00-15/08

Claims (1)

(57) [Claim 1] A substantially cylindrical shape having a through hole as a fixing portion to the first member is formed in the center portion, and a second member is formed on the outer periphery thereof. Is provided in a non-contact state with the first member, and is provided between the first and second members by an anti-vibration rubber member that intercepts vibration between the two members. A plurality of holes are provided on the inner peripheral surface of the through hole along the direction of the central axis of the through hole.
The concave groove of the book has both ends, anti-vibration rubber part with through holes opened
It should not be formed in a closed state so as not to reach both end faces of the material.
Ri, in (a) the holding portion, a load in the direction orthogonal to the direction of the central axis of the through hole was measured at an applied state, the direction parallel to the direction of the load, and perpendicular to the direction described above, And a spring constant in three directions, a direction parallel to the direction of the central axis of the through hole, and a direction orthogonal to the two directions, and (b) a load applied to the holding portion in a direction parallel to the direction of the central axis of the through hole. Three directions measured in an applied state, parallel to the direction of the load, orthogonal to the above direction, and parallel to the direction of the load in (a), and orthogonal to the above two directions. , The maximum value K _max and the minimum value K _min of the six types of spring constants satisfy the formula (i): 1 ≦ K _max / K _min ≦ 3.24 (i) Anti-vibration rubber member.