JPH04357345A - Insulator - Google Patents

Abstract

PURPOSE:To deal with the shock vibration in an insulator, in which a shock absorber made of gel material is interposed between a supporting inner cylinder and a supporting outer cylinder to be fitted to a pair of members, by providing an excess amplitude preventing structure in both directions of displacement of the supporting outer cylinder or on any one end thereof. CONSTITUTION:A fitting bolt 4 to be provided in a support frame 3 consists of a fitting shaft 6, which is stood upward from a disc-shape fitting base 5 of a lower part, and a male screw 7 extended thereon, and an insulator 1 is fitted to the fitting shaft 6. The insulator 1 consists of a shock absorbing block 10 mainly composed of the shock absorber 9 such as silicon gel or the like and an excess amplitude preventing structure. The excess amplitude preventing structure consists of a rubber-made fitting cap 15, which has an engagement part 17 to be engaged with a locking part 12c of the supporting outer cylinder 12 of the shock absorbing block 10 and which is provided in the upper so as to pinch the material A to be supported, and a base block 23, which is provided below through a coil spring 21 and has a lower sleeve 24 to be fitted to the fitting shaft 6.

Description

[Detailed description of the invention]

0001

[Purpose of the invention]

[Industrial Application Field] The present invention is applicable to various electronic devices such as audio equipment, optical equipment, measuring equipment, precision equipment, various control devices installed in production lines, automobiles, railway vehicles, aircraft, rockets, ships, etc. It is related to parts that are incorporated and used in the control units of various vehicles and control boxes installed in the route of operation and at takeoff and landing points, and controls vibrations that may adversely affect the control equipment in the control boxes. This relates to an insulator that absorbs vibrations to prevent them from being transmitted to equipment.

0002

BACKGROUND OF THE INVENTION Conventionally, insulators have been widely used in various electronic devices, measuring instruments, etc. to protect them from external vibrations that adversely affect their characteristics. It is being Most of these insulators are provided on the bottom surface of a box housing various electronic devices, etc., and absorb vibrations when the vibrations are directly transmitted to the installation site of the box. However, depending on the installation environment, if vibrations with a large vibration amplitude are constantly occurring, or if higher-order vibration absorption is required due to the characteristics of the electronic equipment or measuring equipment, an insulator may also be installed inside the box. , it is necessary to perform vibration absorption in a complex manner.

[0003] As is clear from the above requirements, especially for the insulator provided in the box,
A product with higher damping and better vibration absorption properties is required. However, on the other hand, if we try to improve the vibration absorption characteristics, we will try to effectively absorb vibrations with small vibration amplitudes, so the strength will inevitably become weaker and it will not be able to cope with vibrations with large vibration amplitudes. A problem arises.

0004

[Technical matters attempted to be developed] The present invention was made in view of this background, and by applying an excessive amplitude prevention structure to a vibration absorber that directly absorbs vibrations, the original nature of the vibration absorber is improved. This paper proposes a new insulator that can cope with impact vibration while maintaining its vibration absorption properties.

[0005]

[Structure of the invention]

[Means for achieving the object] The insulator, which is the first invention according to the present application, has a supporting inner cylinder attached to one member of a pair of members that are required to have a relatively vibration-absorbing effect, and an insulator attached to the other member. A vibration absorber made of a gel-like material is interposed between the support inner cylinder and the support outer cylinder, and the vibration absorber is deformed in the shearing direction to reduce the vibration generated between the pair of members. In the device for absorbing vibration, an excessive amplitude prevention structure is provided at either or both ends of the supporting outer cylinder in the displacement direction, and the excessive amplitude preventing structure directly contacts the supporting outer cylinder. , or other relay member to abut the stopper.

[0006] In addition to the above-mentioned requirements, a second invention according to the present application is an insulator characterized in that, in addition to the above-mentioned requirements, some elements of the above-mentioned excessive amplitude prevention structure are constituted by a rubber-like member.

[0007] In addition to the requirements of claim 1, the insulator according to the third invention of the present application has a rubber-like member at one end of the support outer cylinder, which is a part of the excessive vibration prevention structure. An assembly cap is fitted into the assembly cap, and the assembly cap supports one member required to have a vibration absorbing action in a sandwiched state between this assembly cap and the upper regulating edge of the supporting outer cylinder, and the upper surface of the assembly cap is fitted with the upper regulating edge of the supporting outer cylinder. It is characterized by having a contact surface with a stopper which is a part of the vibration prevention structure.

[0008] In addition to the above-mentioned requirements, the insulator, which is a fourth invention according to the present application, is characterized in that, in addition to the above-mentioned requirements, a base block, which is a part of the excessive amplitude prevention structure, is provided below the support outer cylinder. It is what it is.

[0009] In addition to the above-mentioned requirements, the insulator, which is the fifth invention according to the present application, is characterized in that, in addition to the above-mentioned requirements, a coil spring is provided between the pair of members required to have the vibration-absorbing action so as to surround the support inner cylinder. It consists of characteristics.

[0010] In addition to the above-mentioned requirements, the insulator which is the sixth invention according to the present application is characterized in that the inner side of one end of the coil spring is positioned by the base block. This aims to achieve the above objective.

[0011]

Effects of the Invention The insulator of the present invention absorbs vibrations generated between a pair of members that are required to have a relative vibration-absorbing effect by deforming the vibration-absorbing body in the shearing direction. When a vibration with a large vibration amplitude acts on the vibration absorber,
The excessive amplitude prevention structure acts to suppress the excessive amplitude. In addition, when a rubber-like member is used as a part of the excessive amplitude prevention structure, the compression or flexural deformation of the rubber-like member reduces the impact at the time of contact caused by excessive amplitude.

[0012] Furthermore, when an excessive amplitude prevention structure is adopted in which an assembly cap is engaged with the support outer cylinder and a stopper is used to stop the displacement movement of the support outer cylinder through this assembly cap, the stopper In addition to the function of preventing excessive vibration, the support member also acts in combination with the upper regulating edge of the supporting outer cylinder to clamp one of the members required to have a vibration absorbing function. In addition, when a base block is used as an excessive amplitude prevention structure, the supporting outer cylinder directly contacts the base block to prevent excessive amplitude, and also performs a positioning function for the coil spring.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The insulator of the present invention will be explained below based on the drawings. For explanation, first refer to Figures 1 to 5.
The structure of the insulator of the present invention will be described based on the following, and then the operating state of the insulator of the present invention will be described and other embodiments will be mentioned. The insulator shown by reference numeral 1 in the figure is the insulator of the present invention, and is used in various electronic devices such as audio equipment, optical equipment, and measuring equipment, precision equipment, various control devices installed in manufacturing lines, and automobiles. , installed inside the control units of various vehicles such as railway cars, aircraft, rockets, ships, etc., and control boxes installed on their routes or at takeoff and landing points. Specifically, as shown in Figures 1 and 2, control boxes It is installed on a support frame 3, which is an outer casing member of No. 2, using mounting bolts 4 that are raised in the shape of appropriate stud bolts.

In the case of this embodiment, it is assumed that vibrations are prevented from being transmitted to the supported member A attached to the support frame 3. It can also be used for the purpose of preventing vibrations from being transmitted to the third part, and in consideration of such circumstances, the term ``a pair of members that are required to have a relatively vibration-absorbing effect'' is used in the claims. In this embodiment, a mounting bolt 4 is provided to the support frame 3, and a structure is adopted in which this mounting bolt 4 is used to support the supported member A. Of course, the mounting bolt 4 is provided on the supported member A side, so to speak. It is also possible to adopt a configuration in which it is supported from the opposite direction.

The mounting bolt 4 has a disk-shaped mounting base 5 on the lower side, and from the mounting base 5 upward are mounting parts for various members constituting the insulator 1 of the present invention, which will be described later. The mounting base 5 is, for example, a support frame in the control box 2. 3. Fixed by welding to the bottom. still,
A part of the side periphery of the male threaded portion 7 is cut along the entire length in a D-shape in the cross section, and restricts rotation of a stopper 28, which will be described later.

The insulator 1 of the present invention, which is attached to such a mounting bolt 4, includes a vibration absorbing block 10 mainly composed of the vibration absorber 9, and an insulator of the present invention provided above the vibration absorbing block 10 with the supported member A interposed therebetween. An assembly cap 15, which is an element of one excessive amplitude prevention structure, which is a characteristic configuration, and a base block, which is provided below through a coil spring 21, and which constitutes another excessive amplitude prevention structure, which is a characteristic configuration of the present invention. 23. Then, these members are fitted into the mounting bolt 4 from above, and a washer-like stopper 28 is inserted from above into a D-shaped hole formed in the center of the stopper 28 in the cut portion formed in the male threaded portion 7 of the mounting bolt 4. The fixation is achieved by aligning the mounting bolts 4 with the mounting nuts 29 and screwing the mounting nuts 29 onto the male threads 7 of the mounting bolts 4 from above.

The vibration absorbing block 10 has a support inner cylinder 11 at the center that is fitted onto the mounting shaft 6 of the mounting bolt 4, and a ring with a square or rectangular cross section is inserted from the center of the support inner cylinder 11 slightly downward. A vibration absorber 9, which is a shaped member, is attached externally, and a support outer cylinder 12 is further fixed to the outside of the vibration absorber 9. Of these, the support outer cylinder 12 has a substantially cylindrical main body, and its lower part is tapered to form a holding part 12a that holds the coil spring 21 from the inside, and the upper part of the support part 12a is extended outward in an eave shape. The uppermost part of the cylindrical body is made to protrude outward in a hook shape, and this serves as the locking part 12c for the assembly cap 15. be.

The vibration absorber 9 is made of a gel-like material, and in this embodiment, silicone gel is used as the gel-like material. This silicone gel is a diorganoborisiloxane (hereinafter referred to as component A) represented by the following formula [1]: RR1
2■SiO-(R22SiO)nSiR12R...[1]
[However, R is an alkenyl group, R1 is a monovalent hydrocarbon group having no aliphatic unsaturated bond, and R2 is a monovalent aliphatic hydrocarbon group (at least 50 mol% of R2
is a methyl group, and if it has an alkenyl group, its content is 10 mol% or less), and n is the viscosity of this component at 25°C of 100 to 100,000 cSt.
], the viscosity at 25°C is 50
00 cSt or less, and at least 2 S in one molecule
organohydrogenpolysiloxane (component B) having a hydrogen atom directly bonded to the i atom, and the alkenyl contained in component A relative to the total amount of hydrogen atoms directly bonded to the Si atom in component B. This is an addition reaction type silicone copolymer obtained by curing a mixture in which the ratio (mole ratio) of the total amount of groups is adjusted to be 0.1 to 2.0.

To explain this silicone gel in more detail, the above A component has a linear molecular structure, and the alkenyl group R at both ends of the molecule is attached to the hydrogen atom directly bonded to the Si atom in the B component. It is a compound that can form a crosslinked structure by The alkenyl group present at the end of the molecule is preferably a lower alkenyl group, and in consideration of reactivity, a vinyl group is particularly preferred.

[0020] R1 present at the end of the molecule is a monovalent hydrocarbon group having no aliphatic unsaturated bonds, and specific examples of such groups include methyl, propyl, and hexyl groups. Mention may be made of alkyl groups, phenyl groups and fluoroalkyl groups.

In [1] above, R2 is a monovalent aliphatic hydrocarbon, and specific examples of such groups include alkyl groups such as methyl, propyl and hexyl groups, and vinyl groups. Examples include lower alkenyl groups such as However, at least 50 mol% of R2
is a methyl group, and when R2 is an alkenyl group, the amount of the alkenyl group is preferably 10 mol% or less. If the amount of alkenyl groups exceeds 10 mol %, the crosslinking density becomes too high and the viscosity tends to increase. In addition, n is the viscosity of component A at 25°C, which is usually 100 to 10.
0,000cSt, preferably 200-20,000c
It is set within the range of St.

The above component B is a crosslinking agent for component A, and S
The hydrogen atom directly bonded to the i atom adds to the alkenyl group in component A to harden component A. Component B only needs to have the above-mentioned action, and component B can have various molecular structures such as linear, branched, cyclic, or network.

[0023] In addition to a hydrogen atom, an organic group is bonded to the Si atom in component B, and this organic group is usually a lower alkyl group such as a methyl group. Furthermore, 2 of component B
The viscosity at 5°C is usually 5000 cSt or less, preferably 500 cSt or less. Examples of such component B include organohydrogenpolysiloxane in which both molecular ends are blocked with triorganosiloxy groups, copolymers of diorganosiloxane and organohydrogensiloxane, and tetraorganotetrahydrogencyclotetrasiloxane. , HR12SiO 1/2 unit and S
Copolymer siloxane consisting of iO 4/2 units, and HR12SiO 1/2 units and R13SiO 1
A copolymer polysiloxane consisting of /2 units and SiO 4/2 units can be mentioned. However, in the above formula, R1 has the same meaning as above.

The ratio of the total molar amount of alkenyl groups in component A to the total molar amount of hydrogen atoms directly bonded to Si in component B is usually 0.1 to 2.0;
It is produced by mixing and curing component A and component B so that the ratio preferably falls within the range of 0.1 to 1.0.

The curing reaction in this case is usually carried out using a catalyst. The catalyst used here is preferably a platinum-based catalyst, such as crushed elemental platinum,
Mention may be made of chloroplatinic acid, platinum oxide, complex salts of platinum and olefins, platinum alcoholates, and complex salts of chloroplatinic acid and vinylsiloxic acid. Such a complex salt consists of component A and component B.
It is usually used in an amount of 0.1 ppm (in terms of platinum, the same applies hereinafter) or more, preferably 0.5 ppm or more, based on the total weight of the components. There is no particular restriction on the upper limit of the amount of such catalyst, but for example, if the catalyst is in a liquid state or can be used as a solution, 200 pp.
An amount of less than m is sufficient.

[0026] Component A, component B and catalyst as described above are mixed and allowed to stand at room temperature or are cured by heating to produce the silicone gel used in the present invention. The silicone gel thus obtained is JIS
The penetration measured by K (K-2207-198050g load) usually has a value of 5 to 250. The hardness of such a silicone gel varies depending on the crosslinked structure formed by the above-mentioned components A and B.

The viscosity before curing and the penetration after curing of the silicone gel are determined by using a silicone oil having methyl groups at both ends in an amount of 5 to 75% by weight based on the resulting silicone gel.
It can be adjusted by adding in advance an amount within the range of . Silicone gels can be prepared as described above, or commercially available silicone gels can also be used.

Examples of commercially available products that can be used in the present invention include CF5027, TOUGH-3, TOUGH
-4, TOUGH-5, TOUGH-6, TOUGH-
7 (manufactured by Torre Dow Corning Silicone Company) and X32
-902/cat1300 (manufactured by Shin-Etsu Chemical Co., Ltd.)
, F250-121 (manufactured by Nippon Unica Co., Ltd.).

In addition to the above-mentioned components A, B and catalyst, thixotropic agents, pigments, curing retarders, flame retardants, fillers, etc. may be added within the range that does not impair the properties of the silicone gel. Alternatively, a silicone gel containing a filler of small hollow spheres may be used. Examples of such materials include Fillite (registered trademark) manufactured by Nippon Fillite Co., Ltd. and Expancel (registered trademark) sold by the same company. etc. can be exemplified.

[0030]The vibration absorbing block 1 constructed in this manner
0, a mold 3 as shown in FIG.
1 is used. The mold 31 is formed by, for example, a base plate 32 made of a metal plate, on the upper surface of which each member that actually constitutes the vibration absorbing block 10 is set, and a mold body 33 into which the gel stock solution is poured. This mold body 33 has a holding hole 34 in the center for receiving the support inner cylinder 11, and is a thick-walled disc-shaped member that has different diameters at the upper and lower parts, with the upper part having a slightly smaller diameter and a stepped structure. It is.

The angular ridge of the stepped portion 35 and the upper angular ridge of the holding hole 34 are formed into arcuate surfaces so that the protruding edge 9a remains on the lower surface of the vibration absorber 9. The connection with the supporting outer cylinder 12 is ensured. Further, as the material of the mold body 33, a rubber-like member can be used, and in this embodiment, as an example, EPDM of JIS standard Hs50 to 60 is used.
Made of rubber. In manufacturing the vibration absorbing block 10 using the mold 31 constructed in this manner, the inner support cylinder 11 and the outer support cylinder 12 are set in the mold 31, and the space between the inner support cylinder 11 and the outer support cylinder 12 is The gel stock solution is poured from above into the void until it reaches a predetermined height, and is cured using the method described above.

[0032] The mold 31 used in this example
The reason why a rubber-like member was used as the material for the mold body 33 is that it is relatively easy to manufacture, does not require much molding precision, and maintains a suitable sealing property, preventing leakage when the gel stock solution is poured. It is.

Next, the assembly cap 15, which is one element of the excessive amplitude prevention structure which is a characteristic feature of the present invention, will be explained. The assembly cap 15 has a cylindrical part 16 in the center, the upper part of the cylindrical part 16 protrudes outward like an eave, the end thereof is bent downward, and the inner tip part has a cylindrical part 16 in the vibration absorbing block 10. An engaging portion 17 is formed to engage with the locking portion 12c of the support outer cylinder 12. A retaining ring 18 is provided on this engaging portion 17, and the retaining ring 18 is designed to completely perform its retaining action. In addition, a part of the engaging portion 17 has a cutout portion 1.
9 is provided to facilitate its attachment and detachment.

Rubber-like materials can be used as the material for the assembly cap 15 having such a shape, and as an example, in this embodiment, NB of JIS standard Hs 70° (A) is used.
A composite type rubber made by mixing R rubber and PVC rubber was used. The assembly cap 15 constructed in this manner not only restricts the upward shearing deformation of the vibration absorber 9 that has received excessive amplitude to within an allowable range by contacting the stopper 28, but also prevents the upper restricting edge of the supporting outer cylinder 12. It also plays the role of fixing the supported member A by sandwiching the supported member A with the support member 12b.

Next, the base block 23, which is another excessive amplitude prevention structure which constitutes a characteristic configuration of the present invention, will be explained. The base block 23 includes a thick-walled, substantially cylindrical stopper body 26, and a lower sleeve 24 provided at the center of the stopper body 26, which fits into the mounting shaft portion 6 of the mounting bolt 4. A relief part 25 is formed to avoid interference with the mounting base 5. The outer diameter of the stopper body 26 is set to approximately match the inner diameter of the coil of the coil spring 21 that fits therein.

The stopper body 26 of the base block 23 having such a shape can be made of a rubber-like material, and as an example, in this embodiment, JIS standard Hs6
0° (A) EPDM rubber was used. The base block 23 constructed in this manner also plays a role as a pedestal for positioning the coil spring 21 that regulates the downward shearing deformation of the vibration absorber 9 that has been subjected to excessive amplitude within an allowable range.

[0037]The operating state of the insulator 1 of the present invention thus constructed is as follows.The vibration transmitted to the support frame 3 is absorbed by vertical shearing deformation of the vibration absorber 9, and the vibration is absorbed by the supported member A. Avoid transmission. In addition, when an excessive vibration amplitude with a large vibration amplitude is applied to the vibration absorber 9, an excessive amplitude prevention structure works and the supporting outer cylinder 12
The upper surface of the assembly cap 15 that engages with the locking portion 12c in the base block 23 is in contact with the lower surface of the stopper 28, and the coil spring 21 is compressed and the lower surface of the holding portion 12a in the supporting outer cylinder 12 is It is suppressed by coming into contact with.

Next, another embodiment of the insulator 1 of the present invention constructed in this manner will be described. The embodiment shown in FIG. 6 adopts the structure of the base block 23 in the embodiment shown in FIGS. A coil spring 38 is also provided between the stopper 28 and the upper regulating edge 12b of the supporting outer cylinder 12. In this embodiment, since the supported member A cannot be held as is, another holding means is required, and in this embodiment, as shown in FIG. An engagement protrusion 40 having a hook-shaped engagement piece 39 at the tip thereof is provided, and an engagement hole provided in the supported member A is fitted into the engagement protrusion 40 for retention.

In addition, the embodiment shown in FIG. 7 is similar to the embodiment shown in FIGS.
The shape of the base block 23 is different from that of the embodiment shown in FIG. The contact recess 42 is formed by cutting away the contact recess 42 and the holding part 1
The frictional force generated between the vibration absorber 9 and the vibration absorber 9 can also be used as a means for suppressing excessive amplitude generated in the vibration absorber 9.

[0040]

Effects of the Invention The insulator 1 of the present invention has the structure described above, and exhibits the effects described below. That is, in the insulator 1 of the present invention, since the excessive amplitude prevention structure is applied to the vibration absorber 9 which is responsible for the actual vibration absorption function, even if an excessive amplitude is applied to the vibration absorber 9, the vibration can be suppressed. Don't put too much stress on yourself.

Furthermore, when a rubber member is used as a part of the excessive amplitude prevention structure, the impact at the time of contact due to excessive amplitude is reduced by compression or flexural deformation of the rubber member.
brought about by the impact. Damage to various equipment inside the control box 2 and poor characteristics can also be prevented. In addition, the assembly cap 15 comes into contact with the stopper 28 so that the vibration absorber 9
In addition to preventing excessive amplitude that occurs in the supporting outer cylinder 12, the base block 23 also has the role of holding the supported member A by sandwiching the supported member A with the upper regulating edge 12b of the supporting outer cylinder 12. Since it is in direct contact with the outer cylinder 12 and can prevent excessive vibrations occurring in the vibration absorber 9, it also serves as a pedestal for the coil spring 21, allowing effective use of the member and contributing to a reduction in the number of parts.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing the insulator of the present invention in use.

FIG. 2 is an exploded perspective view, partially cut away, of the insulator of the present invention.

FIG. 3 is a half sectional view of the same as above.

FIG. 4 is a partially cutaway perspective view of the assembly cap.

FIG. 5 is a longitudinal sectional view showing the manufacturing state of the vibration absorbing block.

FIG. 6 is a longitudinal sectional view showing another embodiment of the insulator of the present invention.

FIG. 7 is a longitudinal sectional view showing still another embodiment of the same.

[Explanation of symbols]

1 Insulator 2 Control box 3. Support frame 4 Mounting bolt 5 Mounting base 6 Mounting shaft part 7 Male thread part 9 Vibration absorber 9a Overhanging edge 10 Vibration absorption block 11 Support inner cylinder 12 Support outer cylinder 12a Holding part 12b Upper regulation edge 12c Locking part 15 Assembling cap 16 Cylindrical part 17 Engagement part 18 Retaining ring 19 Notch part 21 Coil spring 23 Base block 24 Lower sleeve 25 Escape part 26 Stopper body 28 Stopper 29 Mounting nut 31 Molding mold 32 Board 33 Mold body 34 Holding hole 35 Step part 37 Stopper body 38 Coil spring 39 Engagement piece 40 Engaging protrusion 42 Contact recess A Supported member

Claims (6)

[Claims] Claim 1: A support inner cylinder attached to one member of a pair of members that are required to have a relative vibration absorption effect, and a support outer cylinder attached to the other member, the support inner cylinder and the support outer cylinder being attached to the other member. In a device that absorbs vibrations generated between the pair of members by interposing a vibration absorber made of a gel-like substance between the support outer cylinder and deforming the vibration absorber in a shearing direction, the displacement of the support outer cylinder is An excessive amplitude prevention structure is provided at both ends or either end of the direction, and the excessive amplitude prevention structure abuts the stopper by directly contacting the supporting outer cylinder or via another relay member. An insulator characterized by comprising: 2. The insulator according to claim 1, wherein some elements of the excessive amplitude prevention structure are made of a rubber-like member. 3. An assembly cap made of a rubber-like member, which is a part of the excessive amplitude prevention structure, is fitted into one end of the support outer cylinder, and the assembly cap is connected to the support outer cylinder. One member required to have a vibration absorbing effect is supported in a sandwiched state between the upper regulating edge of the cylinder, and its upper surface is used as a contact surface with a stopper which is a part of the above-mentioned excessive amplitude prevention structure. The insulator according to claim 1, characterized in that: 4. The insulator according to claim 1, wherein a base block, which is a part of an excessive amplitude prevention structure, is provided below the support outer cylinder. 5. The insulator according to claim 1, wherein a coil spring is provided between the pair of members required to have a vibration absorbing action so as to surround the support inner cylinder. . 6. The insulator according to claim 5, wherein the inner side of one end of the coil spring is positioned by the base block.