JP2863800B2 - Insulator and manufacturing method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Object of the Invention><Industrial Application Field> The present invention relates to precision equipment, optical equipment, medical equipment, audio equipment,
The present invention relates to an insulator that is incorporated in an OA device or the like to block transmission of external vibration to the inside, or to block transmission of internal vibration to the outside.

<Background of the Invention> In recent years, the vibration absorption property of a gel-like substance has been evaluated, and an insulator using this substance has been developed. Such an insulator has conventionally been manufactured by the following method. That is, as shown in FIG. 10, the raw material of the addition-reaction silicone gel prepared beforehand was placed in a cylindrical support A in which the lower part was wrapped and closed and the upper part was opened. The liquid L is injected and cured by heating in an oven. Next, take this part P out of the oven,
After removing the protruding gel on the surface to be bonded, and further appropriately roughening the edge surface of the cylindrical support with sandpaper, washing with water and a solvent, dehydrating, applying a primer, baking, and applying an adhesive, It is combined with the lid member H that has been subjected to the same treatment, and is cured by heating in an oven. Such a method is a conventional manufacturing process, but has the following problems due to the method. That is, first, since the cylindrical support A is made of soft rubber, shape retention is poor. Therefore, at the time of molding, especially the edge which is a free end is deformed, and as a result, the volume inside the cylindrical support is not constant, and the gel injection amount is different individually, which causes variations in the characteristics and causes mass production. It was one of the bottlenecks in doing so. In order to increase the adhesive strength, there is also a method of forming an rim B on the upper part of the cylindrical support A as shown in FIG. 11 (a).
As shown in FIG. 11 (b), the rim portion B is deformed so as to expand, the load-strain characteristics deviate from a straight line, and it becomes difficult to determine an initial setting position when installing an insulator. Further, there is a problem that the adhesive is limited by the type of rubber constituting the cylindrical support A, and it is difficult to give an adhesive pressure on average because soft rubbers are bonded to each other,
There was a problem that the bonding surface of the product was peeled off without obtaining a stable bonding strength.

In addition, due to these problems, the number of man-hours required for solving the problems has been extremely increased, which has resulted in an increase in the manufacturing cost.

<Technical matters attempted to be developed> The present invention has been made in view of such a background, and by providing a relatively hard member at the edge of the cylindrical support, the shape retention of the cylindrical support is improved. In addition, an attempt was made to develop an insulator having improved adhesion to the rubber constituting the lid portion and the cylindrical support through this member, and a method of manufacturing the insulator.

<< Constitution of the Invention >><Means for Achieving the Object> The insulator according to the first invention of the present application is provided with a vibration absorbing portion made of a gel-like substance inside a soft rubber tubular support having an edge at least in an upper portion. In the vibration isolator of the invention, the edge portion is provided with a shape retaining ring made of a relatively hard material.

Further, the insulator of the second invention according to the present application,
In addition to the above requirements, the vibration absorbing portion has a penetration of 20 to 200 degrees, the soft rubber tubular support has a hardness of 40 degrees or less, and the relatively hard material has a hardness of 50 degrees or more. It is characterized by the following.

Furthermore, the insulator of the third invention according to the present application is:
In addition to the above requirements, a lid having an air hole is provided on the upper part of the shape retaining ring, and a breathable material is provided so as to close the air hole.

Further, the method for manufacturing an insulator according to the fourth invention according to the present application is to provide a vibration absorber made of a gel-like substance inside a soft rubber tubular support having at least an upper edge,
A shape-retaining ring made of a relatively hard material is provided on the edge, and a lid having an air hole is provided on the upper part of the shape-retaining ring, and a breathable material is provided between the lid and the vibration absorbing portion. In the method of manufacturing an insulator provided with, a lid and a cylindrical support body whose air holes are closed with a gas-permeable material are bonded to each other, and then a stock solution of a gel-like substance is injected from the air holes and cured. It consists of

Furthermore, a method of manufacturing an insulator according to a fifth invention according to the present application is to provide a vibration absorber made of a gel-like substance inside a soft rubber tubular support having an edge at least in an upper part, and the edge is provided at the edge. In a method of manufacturing an insulator having a shape retaining ring made of a relatively hard material and a lid having an air hole provided on an upper portion of the shape retaining ring, the cylindrical support and the lid are bonded in advance. And a raw material of a gel-like substance is injected from the air hole, and after hardening, a gas permeable material or a bushing having the air hole is inserted into the air hole.

Furthermore, a method for manufacturing an insulator according to a sixth invention according to the present application is to provide a vibration absorber made of a gel-like substance inside a soft rubber tubular support having an edge at least in an upper portion, and to provide the insulator with the edge. A vibration isolator body provided with a shape-retaining ring made of a relatively material is set in an injection mold, and a lid is formed by insert-molding a resin so as to surround the shape-retaining ring. It is.

The present invention aims to achieve the above object.

<Effect of the Invention> In the present invention, since the shape retaining ring made of a relatively hard material is provided at the edge, the edge shape which is a free end is particularly fixed,
The shape retention of the cylindrical support is further improved, and the adhesion between the lid and the rubber constituting the cylindrical support is improved through the shape retaining ring.

In addition, if a lid having an air hole is provided on the upper part of the shape retaining ring and a breathable material is provided between the lid and the vibration absorbing portion, the residual air expanded when the uncured gel is heated and cured. , And the presence of the air-permeable material prevents the gel-like substance from being pushed out from the air holes when the insulator is pressurized.

Further, a vibration absorber made of a gel-like substance is provided inside a cylindrical support made of a soft rubber having an edge at least at an upper portion, and a shape retaining ring made of a relatively hard material is provided at the edge. A lid having an air hole provided at an upper portion of the shaped ring, and further comprising a gas permeable material provided between the lid and the vibration absorbing portion, wherein the air hole is closed with a gas permeable material. In the method of bonding the gel support with the cylindrical support, then injecting the undiluted solution of the gel substance from the air hole, and curing, the gel is hardened after being cured even if the undiluted gel solution is injected, and is not pushed out. The void volume inside the cylindrical support can be reduced.

Furthermore, a vibration absorbing portion made of a gel material is provided inside a soft rubber tubular support having an edge at least on an upper portion, and a shape retaining ring made of a relatively hard material is provided at the edge, In the method of manufacturing an insulator provided with a lid having an air hole on the upper part of the shape retaining ring, after bonding the cylindrical support and the lid in advance, a stock solution of a gel-like substance is injected from the air hole and cured. If the air-permeable material or the bushing having the air hole is inserted into the air hole after this, the stress is intensively dispersed or absorbed.

Further, a vibration-absorbing portion made of a gel-like substance is provided inside a soft rubber tubular support having an edge at least at an upper portion, and a shape retaining ring made of a relatively hard material is provided at the edge. If the main body of the shaker is set in the injection molding die, and the lid is formed by insert molding of the resin so as to surround the ring, the adhesiveness between the lid and the main body of the vibration isolator is formed through the ring. Therefore, even when the resin is supplied into the cavity of the injection mold, the edge of the cylindrical support is not deformed by the injection pressure. In addition, there is no gap between the vibration absorbing portion and the lid.

<Example> Hereinafter, the present invention will be specifically described based on an illustrated example. Reference numeral 1 denotes an insulator according to the present invention, which is a cylindrical support 2 made of soft rubber having a substantially cylindrical shape.
A vibration absorbing part 3 made of a gel-like substance is provided in the inside, and a shape retaining ring 5 and a disk body 7 are provided on edges 4 formed above and below the cylindrical support 2, respectively, and further a shape retaining ring 5 is provided. The lid 8 is provided on the other side. The side on which the shape retaining ring 5 is provided among the edges 4 is defined as an upper edge 4a, and the side on which the disk body 7 is provided is defined as a lower edge 4b. A body provided with the vibration absorbing part 3 and the shape retaining ring 5 on the cylindrical support 2 is defined as a vibration isolator main body 6. In this embodiment, the cylindrical support 2 has a cylindrical shape whose both ends are open. However, a cylindrical support whose one end is closed is used, and a shape retaining ring 5 is provided on the open end side. Is also good. In addition, since the cylindrical support 2 needs to be deformed in accordance with the deformation of the vibration absorbing portion 3, its hardness Hs is preferably 40 degrees or less. As the gel material constituting the vibration-absorbing part 3, for example, silicone gel can be applied, which is composed of a dimethylsiloxane component unit, and has a diorganopolysiloxane (hereinafter referred to as a component A) and a viscosity at 25 ° C. Is 5000 cSt or less, and comprises an organohydrogenpolysiloxane having a hydrogen atom directly bonded to at least three Si atoms in one molecule (hereinafter, referred to as a B component), and
A to the total amount of hydrogen atoms directly bonded to Si atoms
Ratio (molar ratio) of the total amount of alkenyl groups contained in the components
Is an addition reaction type silicone polymer obtained by curing a mixture adjusted to be 0.1 to 2.0. An example of such a silicon cone gel is CF5027, TOUGH-3, T
OUGH-4, TOUGH-5, TOUGH-6, X32-902 / cat1300 manufactured by Shin-Etsu Chemical Co., Ltd., F2 manufactured by Nihon Unica Co., Ltd.
50-121 and the like. The hardness of the silicone gel can be adjusted by using the amount of the component A in excess of the amount capable of forming a crosslinked structure with hydrogen atoms directly bonded to Si atoms in the component B. The hardness of the vibration absorbing portion 3 is preferably such that the penetration is 20 to 200 degrees. The shape retaining ring 5 is a flat annular body having substantially the same width as the upper edge portion 4a, and is made of a relatively hard material having a shape retaining property such as metal plastic. The purpose of providing the shape retaining ring 5 is to provide shape retention to the upper edge portion 4a. Therefore, it is preferable that the hardness Hs is 50 degrees or more. The disk body 7 is made of, for example, metal and adheres to the lower edge 4b of the cylindrical support 2 to substantially serve as a lower lid. The disk body 7 is provided with a rod-shaped mounting portion 10 in which, for example, a screw is engraved from the center thereof. The structure of the mounting portion 10 may be such that a female screw is formed as shown in FIG. 8 (a) or a bracket is formed as shown in FIG. An appropriate structure can be adopted. Incidentally, the mounting portion 10 is provided for connection with a device T as a vibration source or connection with a member U on a side for preventing transmission of vibration. The lid 8 is a member having substantially the same shape as the shape-retaining ring 5, and has an air hole at the substantially center thereof for removing the residual air expanded when the uncured gel is heated and cured.
Form 11. The position where the air hole 11 is formed is not necessarily limited to the center of the lid 8, and the member forming the air hole 11 is not limited to the lid 11 and may be provided on the disk 7 side. At a position corresponding to the air hole 11, a breathable material 12 is provided between the lid 8 and the vibration absorbing portion 3. Incidentally, the air-permeable material 12 is for preventing the gel-like substance from being pushed out. That is, a small amount of the stock solution of gel is put into the cylindrical support 2 in order to facilitate the adhesion between the cylindrical support 2 and the lid 8. However, in this case, a void is formed in the cylindrical support 2 and the insulator The characteristic value changes. For this reason, the air holes 11 are provided in order to release the air in the gaps. However, in this state, the gel-like substance may be pushed out from the air holes 11 when the insulator is pressurized. Therefore, a permeable material 12 is provided to cover the air holes 11. As the air permeable material 12, a material through which air can pass, such as a foam material or a nonwoven fabric, is used. Note that the size of the air permeable material 12 may be any size that can cover at least the air holes 11. However, considering stability in the cylindrical support 2, the size is close to the inner diameter of the cylindrical support 2. It is more preferable to use one having Further, in the present embodiment, the mounting portion 10 is formed only on the disk body 7 side, but the lid 8 may be provided with the same engaging portion as the mounting portion 10 if necessary. Further, in the various embodiments described above,
Although the vibration absorbing portion 3 is composed of only the gel-like substance, it can be provided in combination with a spring member. In FIG. 9, the spring member 13 is provided in a floating state in a gel-like substance. By the way, with such a configuration, the spring member 13 functions as an inertial body to constitute a dynamic damper system, and when the vibration absorbing portion 3 is deformed by vibration exceeding a certain level, the end of the spring member 13 is Since it is supported by being connected to the lid 8 or the like, a spring action works and deformation of the vibration absorbing portion 3 can be suppressed. Alternatively, the end of the spring member 13 may be supported by the lid 8 and the disk body 7 using a spring member 13 having a relatively small spring coefficient, and the spring member 13 itself may have a buffering action.

The insulator according to the present invention has the above-described structure, and a method of manufacturing the insulator will be described below. In the first manufacturing method, first, the shape retaining ring 5 and the disk body 7 are degreased, an adhesive for baking is applied and dried, and these are set in a mold as shown in FIG. Next, a predetermined amount of the low-hardness rubber raw material is weighed and charged into a mold, the die is closed and set in a press machine, and then the rubber raw material is cured at a predetermined temperature, pressure and curing time, and is taken out of the die. As a result, the shape retaining ring 5 and the disk 7 are bonded to the cylindrical support 2. Next to this thing A,
A two-component addition reaction type silicone gel raw material B is mixed at a predetermined mixing ratio, and a defoamed mixture thereof is poured in a predetermined amount and cured in an oven at a predetermined temperature for a predetermined time. Incidentally, since the cylindrical support 2 provided with the shape retaining ring 5 can maintain a constant shape, the volume of the portion filled with the silicone gel raw material is accurate. Therefore, the labor for shaving the gel that has protruded after the silicone gel has hardened can be omitted. Then, the adhesive surface of the lid 8 prepared in advance is degreased and an adhesive is applied, and the air permeable material 12 is sandwiched so as to face the air hole 11 formed in the lid 8, and the lid 8 is held in the shape retaining ring 5.
And glue it. When bonding the lid 8, an appropriate mold may be used, and heating may be performed depending on the adhesive used. When heating is performed in this manner, air existing inside or above the gel expands, so that it may be difficult to obtain a stable adhesive state. In this case, the inflated air escapes from the air hole 11 formed in the lid 8 via the air permeable material 12. The above is the first manufacturing method of the insulator according to the present invention, but a method in which this manufacturing method is partially modified may be adopted. That is, in the above-described manufacturing method, the raw material of the silicone gel is injected into the cylindrical support 2 and cured, but the cured silicone gel may be inserted into the cylindrical support 2 and then bonded. . Although an adhesive is used in the method described above, a baking rubber solution may be applied to the surface to be bonded and bonded by baking according to a usual method of baking rubber.

Next, the second manufacturing method will be described. This method
After the lid 8 is provided on the cylindrical support 2, the silicone gel raw material is injected. That is, as shown in FIG. 5, first, a disk 7 and an air hole 11 are formed in the cylindrical support 2 and the lid 8 provided with the air permeable material 12 in the air hole 11 is attached to the adhesive or Adhere by rubber baking method. Next, the adjusted silicone gel raw material liquid is injected using the air holes 11 of the lid 8, and is heated and cured in an oven. In addition, as a method of injecting the silicone gel raw material liquid, in addition to a method of using an injection needle to penetrate the air permeable material 12 and directly inject it into the cylindrical support 2,
There is a method of injecting by pouring through 12. By the way, when the latter method is adopted, the air can be eliminated while the gas permeable material 12 is reinforced by hardening the gel. It is to be noted that the air-permeable material 12 is provided because the gel after curing is easily deformed due to low hardness, and has a small tear strength. Therefore, when a large compressive force is applied when absorbing vibration, the gel near the air hole 11 of the lid 8 is provided. This is because intensive stress is applied to the gel, and the gel may be pushed out from the air holes 11. Therefore, the thing provided in the air hole 11 may be a gas-permeable bushing 12a as shown in FIG. Specific examples of the breathable material 12 and the bushing 12a will be described later. In the present manufacturing method, as a method of providing such a gas-permeable material 12 or a gas-permeable bushing 12a, as shown in FIG. In addition to the method of bonding to the air hole 11 of FIG. 8, a gas permeable material 12 or a gas permeable bushing 12a that fits with the air hole 11 is prepared in advance as shown in FIG. After the gel has hardened in the tubular support 2, it may be inserted into the air hole 11.
In this way, in the method of providing the gas permeable material 12 or the gas permeable bushing 12a after the injection of the silicone gel stock solution, the gel material can be almost completely filled.

Next, a third manufacturing method will be described. In this method, when the lid 8 is provided, an insert molding method is applied to cover 8
Is characterized in that it is molded. Hereinafter, as an example, the upper and lower edges of the cylindrical support 2 as shown in FIG.
The manufacturing method will be described with reference to an insulator having a shape retaining ring 5 provided on each of 4a and 4b and a resin lid 8 surrounding the shape retaining ring 5 as an example. First, the seventh
The vibration isolator main body 6 as shown in FIG. 1A is manufactured by a method similar to the first manufacturing method. Then placed between the upper mold K ₁ and the lower die K ₂ as shown the vibration-proof concrete 6 to FIG. 7 (b). Injecting molten resin into the cavity C in this state in the upper mold K ₁ and the lower die K _2. At the time of injection, injection pressure is applied to the vibration isolator main body 6, but since the shape retaining ring 5 is provided, the lid 8 is molded so as to surround the shape retaining ring 5 without the edge 4 being deformed. You.

Next, members suitable for use in the above manufacturing method will be described below. The shape retaining ring 5 is made of a metal, a thermoplastic resin, a thermosetting resin, or an inorganic compound, does not become a catalyst poison of a silicone gel curing catalyst, does not deteriorate due to temperature and pressure during the manufacture of the vibration isolating concrete body 6, and has a self-shape. With holding capacity, or rubber and elastomer with hardness of JIS K6301
Select a spring hardness (JIS A) of Hs50 degrees or more that can withstand the manufacturing conditions. The rubber material is a commercially available rubber cross-linked with a peroxide compound, and specific examples include ethylene propylene rubber, nitrile butadiene rubber, chloroprene rubber, isobutylene rubber, and fluorine rubber. Elastomers may be thermoplastics as long as they do not contain a large amount of a sulfur-, phosphorus-, or other element that becomes a catalyst poison for the curing catalyst of the silicone gel as a stabilizer. BR, IR
Styrene-based elastomers, olefin-based elastomers such as IIR and EPDM, as well as PVC-based, urethane-based, ester-based, amide-based, and other materials commonly referred to as TPE (thermodic elastomers). The lid 8 can be made of the same material as the shape-retaining ring in the above-described first or second manufacturing method, while the lid 8 can be applied to the shape-retaining ring 5 in the case of the third manufacturing method. Among the possible materials, thermoplastic resins and elastomers that can be injection molded can be used. Further, the soft rubber used for the on-cylinder support 2 has a hardness of JIS K 6301 Hs applied to this embodiment.
40 degrees (JIS A) or less, peroxide cross-linked product, other than silicone rubber, unmodified dimethyl silicone rubber and phenyl or fluoro-modified silicone rubber, IIR rubber and its chlorinated type, urethane rubber, ethylene propylene rubber ( EPDM), nitrile butadiene rubber (NBR), chloroprene rubber (CR) and the like. Further, among the commercially available adhesives, those which are flexible and can withstand impact and repeated stress are desirable, and are liquid or prepreg sheet-like epoxy adhesives, chloroprene adhesives, nitrile butadiene adhesives. Agents, urethane-based adhesives and the like. The material which can be applied as a breathable material and as a stress dispersant is a foamed material and made of gas permeable cells, or woven fabric, nonwoven fabric, cotton, felt, and the like. A bushing 12a having a small hole for venting air can be applied to the portion.

<< Effects of the Invention >> In the present invention, since the shape retaining ring 5 is provided on the edge portion 4, the bonding strength with the lid 8 is increased, and the width of the usable adhesive is widened. This makes it possible to reduce the number of manufacturing steps.

In addition, since the shape retaining ring 5 is provided, the edge portion 4 has a shape retaining property, the volume inside the cylindrical support 2 is stabilized, and it is not necessary to individually adjust the gel injection amount, so that mass production becomes possible. .

Further, a lid 8 having an air hole 11 is provided above the shape retaining ring 5.
A gas permeable material 12 is provided between the lid 8 and the vibration absorbing portion 3.
If a gel is provided, the remaining air that has expanded when the uncured gel is cured by heating can be removed, so that a stable product can be obtained. Is not pushed out of the air hole.

Furthermore, after the cylindrical support 2 and the lid 8 are bonded in advance, a stock solution of a gel-like substance is injected from the air hole 11 of the lid 8 and hardened. It is possible to obtain a high-quality insulator without generating voids.

Furthermore, a vibration absorbing part 3 made of a gel-like substance is provided inside a cylindrical support 2 made of a soft rubber having an edge 4 at least on an upper part, and a shape retaining ring 5 made of a relatively hard material is provided on the edge 4. In the method of setting the vibration isolator main body 6 provided with the resin in an injection molding die and insert-molding a resin so as to surround the shape retaining ring 5 to form the lid portion 8, vibration is prevented by the presence of the shape retaining ring 5. The adhesiveness between the component body 6 and the lid 8 made of resin is improved, and a high-quality product can be obtained without deforming the edge 4 even during resin injection.

[Brief description of the drawings]

FIG. 1 is a perspective view showing the used state of the insulator of the present invention and a state in which the insulator is enlarged and broken, FIG. 2 is an exploded perspective view of the insulator of the present invention, FIG. 3 is a vertical sectional side view of the same, and FIG. Is an explanatory view showing step by step the manufacturing method of the insulator shown in FIGS. 2 and 3, FIG. 5 is an explanatory view showing another manufacturing method same as above, and FIG. 6 is a countermeasure for preventing leakage of gel from air holes. FIG. 7 is a perspective view showing an embodiment in which a bushing is provided, FIG. 7 is an explanatory view showing a method for manufacturing an insulator in which a lid is formed by insert molding, and FIG. 8 is another two examples of a connecting portion. A perspective view showing
FIG. 9 is a longitudinal side view showing an embodiment in which a spring member is provided in a vibration absorbing portion, FIG. 10 is an explanatory view showing a conventional insulator manufacturing method, and FIG. 11 shows another conventional insulator and its problems. FIG. 1; insulator 2; cylindrical support 3; vibration absorber 4; edge 4a; edge (upper) 4b; edge (lower) 5; shape retaining ring 6; vibration isolator body 7; disk 8; 10; mounting portion 11; the air hole 12; breathable material 12a; bushing 13; spring member C; cavity K _1; (serving vibration source) apparatus U;; upper mold K _2; lower die T member

Continuation of the front page (56) References JP-A-1-182644 (JP, A) JP-A-1-308774 (JP, A) JP-A 63-133656 (JP, U) JP-A 63-171740 (JP) , U) Real opening Sho 61-105318 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) F16F 13/00

Claims (6)

(57) [Claims] An anti-vibration device comprising a soft rubber tubular support having at least an upper edge portion provided with a vibration absorbing portion made of a gel material, wherein the edge portion is made of a relatively hard material. An insulator provided with a shape-retaining ring. 2. The vibration absorbing portion has a penetration of 20 to 200 degrees, the soft rubber tubular support has a hardness of 40 degrees or less, and the relatively hard material has a hardness of 50 degrees or more. The insulator according to claim 1, wherein: 3. The insulator according to claim 1, wherein a lid having an air hole is provided on an upper portion of the shape retaining ring, and a gas permeable material is provided so as to close the air hole. 4. A vibration absorbing portion made of a gel material is provided inside a soft rubber tubular support having an edge portion at least on an upper portion, and a shape retaining ring made of a relatively hard material is provided at the edge portion. At the same time, a lid having an air hole is provided on the upper part of the shape retaining ring, and further, in a method of manufacturing an insulator having a gas permeable material provided between the lid and the vibration absorbing portion, the air hole is made of a gas permeable material. A method for manufacturing an insulator, comprising: adhering a closed lid and a cylindrical support; thereafter, injecting a stock solution of a gel substance through an air hole and curing the insulator. 5. A vibration absorber made of a gel-like material is provided inside a soft rubber tubular support having an edge at least at an upper portion, and a shape retaining ring made of a relatively hard material is provided at said edge. In addition, in the method of manufacturing an insulator in which a lid having an air hole is provided on the upper part of the shape retaining ring, a stock solution of a gel-like substance is injected from the air hole after the cylindrical support and the lid are bonded in advance. A method of manufacturing an insulator, comprising: after curing, inserting a breathable material or a bushing having a ventilation hole into the air hole. 6. A vibration absorber made of a gel-like substance is provided inside a soft rubber tubular support having an edge at least at an upper portion, and a shape retaining ring made of a relatively hard material is provided at said edge. A method for manufacturing an insulator, comprising: setting the vibration isolator main body in an injection molding die; and forming a lid by insert molding resin so as to surround the shape retaining ring.