JP3766928B2 - Viscous rubber damper - Google Patents

Description

[0001]
【Technical field】
The present invention includes a hub portion assembled to a rotary shaft, a vulcanized rubber portion fixed to at least one surface of the hub portion, a damper mass portion fixed to the vulcanized rubber portion, and a gap formed by the former three members. The viscous rubber damper is provided with a viscous fluid portion that fills.
[0002]
Further, in the following description, the blending unit is a mass unit unless otherwise specified.
[0003]
[Background]
A viscous rubber damper, which is a type of torsional damper, has the following advantages / disadvantages (see “Japan Rubber Association Vol. 64 No. 5 (1991)” p.281).
[0004]
In the viscous rubber damper, the spring element is made by the rubber part (vulcanized rubber part) and the damping element is made by the viscosity of the viscous fluid part (silicone oil, etc.), so the damping coefficient can be greatly increased and the resonance magnification is reduced. it can. In addition, since the spring element and the damping element are independent, the design can be performed separately and the design range can be expanded.
[0005]
However, on the other hand, since the viscous fluid is sealed inside, the number of assembly steps is increased, and there are problems that the rubber damper does not have, such as ensuring sealing performance.
[0006]
Further, vulcanization bonding is usually adopted as a fixing means for both the hub portion and the damper mass portion each made of metal and the vulcanized rubber portion.
[0007]
However, in order to vulcanize and bond, a mold having a complicated shape for molding and vulcanizing an unvulcanized rubber material between both metal members is required. In addition, since heat is applied in the vulcanization process, it is difficult to make the hub portion that does not require mass plastic.
[0008]
DISCLOSURE OF THE INVENTION
In view of the above, the present invention provides a viscous rubber damper capable of obtaining a necessary bondability (adhesion force) without vulcanization adhesion between a hub portion and / or a damper mass portion and a vulcanized rubber member. The purpose is to do.
[0009]
In order to solve the above-mentioned problems, the present inventors have made an effort to develop a fixed layer (bonding) composed of a moisture-curing adhesive (one-part adhesive) between the rubber compound and the metal. The present inventors have found that it is sufficient to intervene a layer) and have come up with a viscous rubber damper having the following configuration.
[0010]
The hub portion assembled to the rotating shaft, the vulcanized rubber portion fixed to at least one surface of the hub portion, the damper mass portion fixed to the vulcanized rubber portion, and the gap formed by the three members are filled. In a viscous rubber damper comprising a viscous fluid part, a vulcanized rubber part based on a nonpolar rubber, and formed of a rubber compound containing a higher fatty acid processing aid,
The vulcanized rubber part is fixed to the hub part and / or the damper mass part via a fixing layer (bonding layer) made of a moisture-curing adhesive.
[0011]
By using a moisture-curing adhesive, no special heating means is required, and the hub part, vulcanized rubber part, and damper mass part are integrated into one another, that is, when the damper body is manufactured, the three parts are overlapped. After the assembly, the damper body consisting of the three parties can be integrated by simply leaving it alone. That is, it is not necessary to manufacture the damper main body through the vulcanization bonding process. Therefore, the viscous rubber damper can be easily manufactured and can be formed of a plastic material (because it is not necessary to consider the injection pressure and vulcanization temperature during vulcanization molding of the vulcanized rubber part. ).
[0012]
In the above, the moisture curable adhesive is composed of a component (A): a liquid diene high polymer having a hydroxyl group at the terminal, and a component (B): a molecular weight containing a hydroxyl group bonded to at least one secondary carbon. 500 polyols and (C) component: It is desirable to use an organic polyisocyanate compound produced by reacting in the presence of an ester plasticizer. Furthermore, the (A) component OH group content and The ratio of the component (B) to the OH group content is preferably the former / the latter = 1 / 0.5 to 1 / 2.5.
[0013]
By using a moisture curable adhesive that satisfies the above requirements, a vulcanized rubber part formed of a rubber compound containing a higher fatty acid-based processing aid based on a nonpolar rubber, a metal damper mass part, It becomes easy to ensure adhesiveness (bondability) with the hub portion.
[0014]
Furthermore, in the above configuration, it is desirable that the rubber compound contains an organic vulcanizing agent that can react with the nonpolar rubber during vulcanization and has a polar group, and the organic vulcanizing agent includes a halogen group. A quinone derivative into which is introduced is desirable.
[0015]
This is because it becomes easier to secure the adhesion (bonding) between the vulcanized rubber portion and the metal damper mass portion or the hub portion.
[0016]
Specifically, in the above, the nonpolar rubber is ethylene propylene rubber, the processing aid is stearic acid, and the quinone derivative is chloranil (compound name: 2,3,5,6-tetrachloroquinone). .
[0017]
Usually, the lower limit compounding amount of stearic acid and the upper limit compounding amount of chloranil are set to 0.4 parts by mass and 0.7 parts by mass, respectively, with respect to 100 parts by mass of the ethylene propylene rubber.
[0018]
Moreover, it is desirable to form a part of the forming wall of the viscous fluid portion with an elastic film. The increase in the internal pressure of the viscous fluid portion due to the thermal expansion of the viscous fluid is absorbed, and the sealing performance can be easily ensured.
[0019]
The manufacturing method of the viscous rubber damper of the present invention has the following configuration.
[0020]
Viscosity filling a gap formed by three parts: a hub part assembled to the rotating shaft, a vulcanized rubber part fixed to at least one surface of the hub part, and a damper mass part fixed to the vulcanized rubber part. A method for producing a viscous rubber damper having a fluid part, wherein an adhesive application step of applying a moisture curable adhesive to one or both adhesive surfaces of the hub part and / or the damper mass part and the vulcanized rubber part,
The main body integration process, in which the hub part, damper mass part, and vulcanized rubber part are left in combination and fixed,
A viscous fluid portion forming step of sealing the viscous fluid in the gap for the viscous fluid portion formed by the main body integration step;
It is characterized by manufacturing through.
[0021]
In the above manufacturing method, it is desirable to close the sealing port with an elastic membrane cap when sealing the viscous fluid because the thermal expansion of the viscous fluid can be absorbed.
[0022]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the viscous rubber damper according to the present invention will be described with reference to FIGS. Here, a description will be given by taking as an example a type in which a pair of inertia rings (damper masses) 16 and 18 are provided on both surfaces of a hub plate (hub portion) 12 via a pair of rubber rings (vulcanized rubber portions) 14 and 14. The present invention is not limited to this embodiment, and can of course be applied to other types and forms of viscous rubber dampers.
[0023]
The viscous rubber damper 10 of this embodiment includes a hub plate (hub portion) 12 assembled to a rotary shaft 20 such as a crankshaft, and a pair of rubber rings (vulcanized rubber portions) 14 fixed to both surfaces of the hub plate 12. , 14, first and second inertia rings (damper mass portions) 16, 18 fixed to the rubber ring 14, and a viscous fluid portion 22 that fills a gap formed by these three members. The rubber ring 14 is formed of a rubber compound based on a nonpolar rubber and containing a higher fatty acid processing aid (see FIG. 1).
[0024]
Here, the hub plate 12 and the first and second inertia rings 16 and 18 are usually made of metal, but the hub portion 12 may be formed of fiber reinforced plastic or the like.
[0025]
Further, the first inertia ring 16 and the periphery thereof are provided with a surrounding vertical wall 17 for fitting and holding the second inertia ring 18. An O-ring 21 is interposed between the fitting surfaces of the enclosure wall 17 and the second inertia ring 18. This is for preventing leakage of viscous fluid from the viscous fluid portion 22. The surrounding wall 17 is provided with a locking claw portion 17a on the inner periphery on the front end side. This is from the viewpoint of the workability of setting the second inertia ring 18.
[0026]
The second inertia ring 18 includes a viscous fluid sealing port 18 a, and the viscous fluid sealing port 18 a is closed with an elastic membrane cap 24. This is because the increase in the internal pressure of the viscous fluid portion due to the thermal expansion of the viscous fluid is absorbed to ensure sealing performance.
[0027]
Furthermore, although not necessarily, the bottom surface of the set recess 28 into which the rubber ring 14 is fitted in each of the inertia rings 14 and 18 is a single tapered surface that becomes deeper toward the outer peripheral side. Each piece taper surface is made into the angle which follows the normal line extended from the center of a rotating shaft on the left-right symmetric axis of a damper, ie, the hub board 12. FIG. This is because the strain applied to the rubber ring (rubber portion) 14 is the same strain shape.
[0028]
The viscous fluid portion 22 is formed by sealing a relatively high viscosity (100,000 to 1,000,000) viscous fluid in the gap. Although it does not specifically limit as a viscous fluid, Usually, the silicone oil which is excellent in thermal stability is used. In addition, although the clearance gap between the viscous fluid parts 22 is selected in the range of 0.1-1 mm according to the required attenuation | damping characteristic, it is usually about 0.5 mm.
[0029]
The rubber ring 14 is made of a non-polar rubber and a rubber compound containing a higher fatty acid processing aid. So far, it is almost the same as the existing technology.
[0030]
In the above configuration, the present embodiment is characterized in that the rubber ring 14 is fixed to the hub plate 12 and the damper mass part via a fixing layer (bonding layer) made of a moisture-curing adhesive.
[0031]
Here, the use of a moisture-curing adhesive (one-part adhesive) as the material for forming the bonding layer increases the pot life after preparation of the liquid compared to the two-part type, that is, the liquid stability is increased. Increased, good handleability, and after application to the hub part or damper mass part, almost no adhesive force is developed, and the hub plate 12, rubber ring 14 and inertia ring 16 are sequentially stacked and integrated to form a damper. This is because the workability of manufacturing the main body is not adversely affected. That is, the moisture curable adhesive hardly exhibits an initial adhesive force (for example, within 6 to 12 hours after application).
[0032]
As the moisture curable adhesive, a one-pack type urethane resin described in Japanese Patent Publication No. 63-15294 is an organic solvent-less type and can be suitably used.
[0033]
Specifically, the moisture curable adhesive contains (A) component: liquid diene copolymer having a hydroxyl group at the terminal, and (B) component: molecular weight 50 containing a hydroxyl group bonded to at least one secondary carbon. -500 polyol and component (C): An organic polyisocyanate compound is reacted in the presence of an ester plasticizer.
[0034]
Component (A): A liquid diene copolymer having a hydroxyl group at the terminal is a liquid diene copolymer having a number average molecular weight of 300 to 25000 introduced with 1.7 to 3.0 hydroxyl groups / mol (one molecule). It means a polymer, and those having 1,4 bonds of 50% or more are usually used. This is because, in these ranges, the adhesive layer has flexibility, and it is easy to ensure vibration resistance adhesion when vibration acts on the viscous rubber damper. Specific diene copolymers include butadiene homopolymer, isoprene homopolymer, butadiene-styrene copolymer, butadiene-isoprene copolymer, butadiene-acrylonitrile copolymer, butadiene-2-ethylhexyl acrylate copolymer, butadiene-n-octadecyl acrylate copolymer, and the like. Can be mentioned.
[0035]
In addition, the component (B): a polyol having a molecular weight of 50 to 500 containing a hydroxyl group bonded to at least one secondary carbon includes 1,2-propylene glycol, dipropylene glycol, 1,2-butanediol, , 3-butanediol, 2,3-butanediol, 1,2-pentanediol, 2,3-pentanediol, 2,5-hexanediol, 2,4-hexanediol, 2-ethyl-1,3-hexane Examples include diol, cyclohexanediol, glycerin, N, N′-bis-2-hydroxypropylaniline, N, N′-bishydroxyisopropyl-2-methylpiperazine, and an ethylene oxide adduct of bisphenol A. Usually, a diol having two hydroxyl groups bonded to secondary carbon is used.
[0036]
Examples of the organic polyisocyanate compound include tolylene diisocyanate, MDI, crude MDI, liquid modification of MDI, hexamethylene diisocyanate, xylene diisocyanate, cyclohexanephenylene diisocyanate, chlorophenylene diisocyanate, Naphthalene-1,5-diisocyanate, xylylene-2,2′-diisocyanate, isopropylbenzene-2,4-diisocyanate, polymethylene polyphenyl isocyanate, triphenylmethane-4,4 ′, 4 ′ '-Triisocyanate, isophorone diisocyanate, tolylene diisocyanate addition reaction product with polypropylene glycol or triol, reaction product of 1 mol of trimethylolpropane and 3 mol of tolylene diisocyanate, etc. Of these, highly reactive MDI type is desirable.
[0037]
As the ester plasticizer, in the present invention, phthalic acid esters such as dibutyl phthalate, di-2-ethylhexyl phthalate (hereinafter abbreviated as “DOP”), di-n-octyl phthalate, dioctyl adipate, dioctyl azelate, etc. And linear dibasic acid esters such as dioctyl sebacate, and phosphoric acid esters such as tri-2-ethylhexyl phosphate and trixylenyl phosphate.
[0038]
In the above, the polyol component is mainly composed of (A) component: a liquid butadiene-based copolymer having a number average molecular weight of 500 to 10,000 having a hydroxyl group at the terminal, and (B) component: bonded to at least two secondary carbons. For a polyol component containing an aniline-based polyol (for example, N, N′-bis-hydroxypropylaniline) having a molecular weight of 50 to 500 containing a hydroxyl group, (C) component: organic polyisocyanate, phthalate ester plasticizer It is preferable to consist of the isocyanate prepolymer prepared by making it react in presence.
[0039]
Here, the reason why the liquid butadiene polymer is mainly used is that it is easy to impart flexibility to the formed adhesive layer. The aniline polyol is used to improve the cohesive failure strength of the adhesive layer.
[0040]
The blending ratio (mass ratio) is usually liquid diene polymer / aniline polyol = 95/5 to 80/20.
[0041]
That is, the blending ratio of the component (A) to the component (B) is such that the ratio of the OH group content of the component (A) to the OH group content of the component (B) is 1 / 0.5. It is desirable to be set to ˜1 / 2.5, and more desirably 1/1 to ½.
[0042]
If the component (B) is too small, it is difficult to ensure a sufficient adhesive strength. Conversely, if the component (B) is excessive, the viscosity increases and the coating workability decreases.
[0043]
The NCO content is 3 to 10%. The blending amount of the ester plasticizer is 5 to 70%, desirably 20 to 50% in the moisture curable adhesive. If the amount of the ester plasticizer is excessive, the plasticizer may move to vulcanized rubber after coating, which may adversely affect physical properties.
[0044]
In addition, process oil such as paraffinic oil can be appropriately blended with the moisture curable adhesive. By using paraffinic oil, the stability (pot life: pot life) of the adhesive can be increased. Moreover, it can adjust to the viscosity which can obtain favorable coating workability | operativity. If the viscosity is set too low, it is difficult to obtain the necessary adhesive strength (bonding strength) in a single coating operation, and the coating workability is reduced.
[0045]
The reason why the pot life becomes long is presumed to be that the adhesive is diluted with paraffinic oil, and the reactivity during storage of the adhesive (at room temperature) decreases.
[0046]
As the non-polar rubber which is the base of the rubber compound forming the rubber ring 14, ethylene propylene rubber (EOR) is desirable from the viewpoint of heat resistance, but styrene butadiene rubber (SBR) isoprene rubber (IR), butyl rubber. (IIR), natural rubber (NR), and the like may be used.
[0047]
In particular, among EOR rubbers, the base polymer is a polymer alloy that satisfies the following requirements (1) to (3) previously proposed by the present inventors in Japanese Patent Application No. 9-2376 (Japanese Patent Laid-Open No. 10-196719). It is desirable to use as (raw rubber).
[0048]
(1) The polymer alloy is composed of ethylene / α-olefin / non-conjugated diene copolymer rubber (A): 99 to 60% and liquid ethylene / α-olefin copolymer rubber (B): 20 to 40%. .
[0049]
(2) The ethylene / α-olefin / nonconjugated diene copolymer rubber is composed of ethylene, an α-olefin having 3 to 20 carbon atoms and a nonconjugated diene, and the molar ratio of ethylene to α-olefin is 60. / 40 to 73/27, and the molecular weight distribution index (M _W / M _N ) Is less than 4, and the intrinsic viscosity [η _c ] Is 2.7 to 5.0 dL / g, the iodine value is 10 to 40, and the non-conjugated diene is 5-ethylidene-2-norbornene.
[0050]
(3) The copolymer rubber of liquid ethylene / α-olefin is composed of ethylene and an α-olefin having 3 to 20 carbon atoms, and the molar ratio of ethylene to α-olefin is 50/50 to 78. / 22 and the intrinsic viscosity [η] is 0.3 to 0.5 dL / g.
[0051]
Examples of the higher fatty acid processing aids include stearic acid, lauric acid and esters thereof.
[0052]
The vulcanization system may be a peroxide vulcanization system or a sulfur vulcanization system, but it is desirable to use a peroxide vulcanization system having excellent compression set resistance.
[0053]
Furthermore, in the present embodiment, the rubber compound contains an organic vulcanizing agent that can react with the nonpolar rubber (polymer) at the time of vulcanization and has a polar group. It is easy to ensure early bondability (adhesiveness) by heat treatment at a heating temperature lower than the temperature. This further integrates the hub plate 12, the rubber ring 14 and the inertia ring 16 to manufacture the damper main body and shorten the time until the viscous fluid is sealed, thereby improving the productivity of the damper main body. .
[0054]
Here, examples of the organic vulcanizing agent include quinone derivatives introduced with polar groups (particularly halogen groups: Cl, Br, etc.) and triazine derivatives introduced with polar groups (particularly mercapto groups, amino groups, etc.). it can. Organic vulcanizing agents with these polar groups crosslink to each of nonpolar rubbers and moisture-curing adhesives, and therefore act as vulcanizing agents that cure (crosslink) faster than adhesion to nonpolar rubbers alone. There is. As the quinone derivative, chloranil (compound name: 2,3,5,6-tetrachloroquinone) is preferable, and as the triazine derivative, 2,4,6-trimercapto-1,3,5-triazine is preferable. Can be used.
[0055]
As the polar group, in addition to the above, an amino group (NH ₂ ), Hydroxyl group (OH), carboxyl group (CO ₂ H), a halogenated methyl group (CH ₂ X) etc.
[0056]
The blending amount of the organic vulcanizing agent is not less than the amount that exerts a reaction promoting action on the moisture curable adhesive and not more than the range that does not inhibit the compression set of the elastic body. For example, in the case of chloranil, 0.1 to 0.7 part, desirably 0.4 to 0.6 part, more desirably 0.45 to 0, with respect to 100 parts of ethylene propylene rubber (hereinafter referred to as “EOR”). .55 parts.
[0057]
The blending amount of the processing aid may be a normal blending amount, but it is not less than an amount that does not cause a problem of workability (rubber kneading process) and is not more than the usual blending amount. From the viewpoint of Specifically, in the case of stearic acid, 0.4 to 1 part, preferably 0.45 to 0.8 part, and more preferably 0.5 to 0.6 part with respect to 100 parts of EOR.
[0058]
The rubber compound (unvulcanized compounded rubber) forming the rubber ring according to the present invention is used for normal rubber compounding in addition to nonpolar rubbers, higher fatty acid processing aids and organic vulcanizing agents. Carbon black, softener (excluding higher fatty acid processing aids), zinc white, and other auxiliary materials.
[0059]
For example, in the case of an organic peroxide vulcanization type EOR system, the rubber compound is prepared by the following method, for example.
[0060]
That is, using a mixer such as a Banbury mixer, the above EOR, softener (process oil) and stearic acid were kneaded at 30 to 170 ° C. for 3 to 10 minutes, and then added using rolls such as an oven roll. Add the sulfur agent (organic peroxide or sulfur), carbon black, the above organic vulcanizer (chloranil), vulcanization accelerator or vulcanization aid, and other auxiliary materials as necessary, roll temperature After kneading at 40 to 80 ° C. for 5 to 30 minutes, the kneaded product is extruded to prepare a ribbon-like or sheet-like compounded rubber.
[0061]
In order to obtain rubber ring from the EOR rubber compound according to the present invention, the above-mentioned unvulcanized compounded rubber is molded and vulcanized into the shape of the intended rubber member, or vulcanized into a sheet body having a predetermined thickness, What is necessary is just to cut | judge to the shape of the rubber member to perform.
[0062]
That is, the above-mentioned unvulcanized compounded rubber is molded into an intended shape by an extrusion molding machine, a calender roll, or a press, and the molded product is introduced into a vulcanizing tank simultaneously with molding or at a temperature of 130 to 170 ° C. Heat for 1 to 30 minutes to obtain vulcanized rubber.
[0063]
Then, the vulcanized rubber is prepared (by molding or cutting) to have a predetermined diameter, width, and thickness to obtain a rubber ring 14.
[0064]
Then, the damper body using the rubber ring 14 is manufactured as follows (see FIG. 2).
[0065]
The moisture-curing adhesive is applied to both sides of the rubber ring 14 in advance. The moisture curable adhesive may be applied together with the rubber ring 14 or on the adhesive surface of the hub plate 12 and / or the inertia rings 16 and 18 with each rubber ring 14. At this time, as a coating method, general-purpose means such as spray coating, brush coating, and roller coating can be used. The hub plate 12 and the inertia rings 16 and 18 are pretreated (degreasing / purifying treatment) in advance. When the hub part and the damper mass part are made of metal, a roughening process is performed on the contact surface with the rubber ring by a grit blasting process, if necessary.
[0066]
The moisture curable adhesive used in the present invention does not exhibit an adhesive force for a certain time (for example, 12 hours) after application. For this reason, it is not necessary to bring the bonding surfaces into contact with each other immediately after the application, and there is no problem even if the application surfaces are applied in advance, and the handleability is also good.
[0067]
Next, as shown in FIG. 2, after the first inertia ring 16 is set on the work table 26, one rubber ring 14, the hub plate 12, and the other rubber ring 14 are sequentially stacked. Thereafter, the second inertia ring 18 to which the O-ring 21 is finally assembled is fitted into the surrounding vertical wall 17 of the first inertia ring 12 to complete the assembly of the damper body. At this time, the locking claw 17a of the surrounding wall is fitted into the locking recess 18a formed on the outer peripheral wall of the second inertia ring 18, and the space between the first and second inertia rings 16, 18 and the hub plate 12 is reached. Thus, the pair of rubber rings 14 and 14 are compressed and held. Moreover, the average compression rate of a rubber ring part is 24 to 45% normally, Preferably it is 33 to 42%. If the compression rate is too low or too high, it is difficult to obtain a predetermined spring constant, that is, a damper characteristic.
[0068]
Then, after a predetermined time (usually 24 hours), the moisture-curing adhesive is cured by moisture in the air and develops an adhesive force between the hub plate 12 and the inertia rings 16 and 18 and the rubber ring 14. A tie layer is formed. Due to the presence of the bonding layer, a sufficient fixing force between the rubber and the metal member can be obtained.
[0069]
And when a rubber compound contains an organic vulcanizing agent (chloranil), especially the connectivity between rubber and a metal member after a resonance endurance test improves remarkably.
[0070]
In the above, heat treatment (for example, 120 ° C. × 1 h) may be performed in order to shorten the completion time of bonding (fixing) of the damper main body.
[0071]
Next, a viscous fluid such as silicone oil is injected from the sealing port 18 a and closed with the elastic membrane cap 24.
[0072]
Here, the filling rate of the viscous fluid varies depending on the required damping force, but is 70 to 95%, preferably 75 to 85% of the volume of the viscous fluid portion 22. The elastic membrane cap 24 is fixed by press-fitting and / or an adhesive.
[0073]
The viscous rubber damper 10 manufactured in this way is attached to the crankshaft (rotary shaft) 20 via the pulley 30 and the like in the same manner as in the prior art.
[0074]
As in the case of the normal viscous rubber damper 10, the spring characteristics are carried by the rubber rings 14 and 14, and the damping force is carried by the viscous fluid portion 22, respectively.
[0075]
Even if the temperature rises and the viscous fluid expands (it may be 100 ° C. or higher), it is closed by the elastic membrane cap 24, so it absorbs the volume change and affects the damping characteristics. There is no risk that the viscous fluid leaks from the viscous fluid portion 22 due to pressurization. Incidentally, since the volume thermal expansion coefficient of silicone oil is 0.001 cc / ° C., it expands by about 10% at 100 ° C.
[0076]
[Test example]
Hereinafter, in order to confirm the effect of the present invention, a test example performed on the example together with the comparative example will be described.
[0077]
A. The composition of the adhesive used and the method for preparing the unvulcanized rubber compound are as follows.
[0078]
(1) Adhesive used:
The formulation of the moisture curable adhesive of each example is as shown below.
[0079]
100 parts of butadiene-based polyol (A)
Aniline polyol (B) 8.2 parts
92 parts of DOP
MDI 60 copies
NCO content 5%
DOP content 35%
OH ratio (A) / (B) 1/1
Viscosity (measured with a B-type viscometer) 7 Pa · s
(2) Preparation of unvulcanized rubber compound
The formulation used for each test example is as follows.
[0080]
EOR (polymer alloy) 147 parts
Stearic acid variable
Zinc flower 5 parts
80 parts of carbon black
Anti-aging agent 2 parts
DCP (40% content) 8 parts
13 parts process oil
Chloranil variable
The polymer alloy used was prepared by blending 47 parts of a low molecular weight component having the following specifications with 100 parts of a high molecular weight component having the following specifications.
[0081]
<High molecular weight component specification>
Ethylene / α-olefin: 68/32, molecular weight distribution index (M _w / M _n ): 3.7, intrinsic viscosity [η _c ]: 4.0 dL / g, iodine value: 22
<Low molecular weight component specification>
Ethylene / α-olefin: 68/32, intrinsic viscosity [η _c ]: 0.37 dL / g, iodine value: 0
In the above basic formulation, rubber blends containing each amount of chloranil and stearic acid in FIG. 3 (stearic acid: 1 part blending) and FIG. 4 (chloranil: 0 part blending) were kneaded with a Banbury mixer. A vulcanized rubber formulation was prepared.
[0082]
B. Each test was performed according to the following method using the unvulcanized rubber compound.
[0083]
(1) Compression set test
According to JIS K 6301, compression set was measured for a vulcanized rubber test piece after a heat resistance test (120 ° C. × 70 h).
[0084]
It can be seen from FIG. 3 showing the results that the compression set with a chloranil content of about 0.7 part also deteriorates.
[0085]
(2) Adhesion strength and surface precipitation
Cylinders (16 mmφ × 10 mmH) were prepared by press vulcanization (170 ° C. × 10 min), and each specimen was prepared by brushing a moisture curable adhesive on the upper and lower surfaces of the cylinder. Each test piece is sandwiched between 25 mm □ × 3.2 mmt steel plates and 35% compressed. After heat treatment (120 ° C. × 240 h), one iron plate is fixed and the other iron plate is pulled to add the iron plate. The strength when leaving the vulcanized rubber body was defined as the fixing force. At the same time, the surface precipitation amount on the peripheral surface was measured by Fourier transform infrared spectroscopy (FT-IR).
[0086]
FIG. 4 showing the results shows that the surface precipitation amount increases and the fixing force decreases in accordance with the increase in the amount of stearic acid. That is, from the standpoint of adhesion strength, it is understood that the smaller the amount of stearic acid, that is, less than 1 part is desirable.
[0087]
【The invention's effect】
The viscous rubber damper according to the present invention is a metal / Between rubber rings (vulcanized rubber) Due to the configuration in which the bonding layer made of the moisture effect type adhesive is interposed, it becomes difficult to cause a problem in the bonding property (adhesiveness) between the hub portion and the damper mass portion and the rubber ring even under a high temperature atmosphere. Rather, the cohesive strength of the bonding layer increases due to the progress of the reaction of the moisture curable adhesive, and the bonding strength after the heat resistance test increases.
[0088]
In addition, an organic vulcanizing agent capable of reacting with a nonpolar rubber at the time of vulcanization and having a polar group is blended with a rubber compound containing a higher fatty acid processing aid that forms the rubber ring. Thus, it is possible to secure the bonding force in a short time by the heat treatment at around 120 ° C. It is presumed that this is because the time required for the bonding force to reach the maximum value due to the completion of the reaction of the moisture-curing adhesive with adhesive strength can be shortened by the organic vulcanizing agent.
[0089]
Therefore, the viscous rubber damper of the present invention can significantly improve the productivity as compared with a configuration in which the vulcanized rubber portion is vulcanized and bonded to a metal portion such as a damper mass. Further, since the hub portion does not need to consider the influence of the injection pressure and temperature during the vulcanization molding of the vulcanized rubber portion, it can be formed of a reinforced plastic material or the like.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an example of a viscous rubber damper to which the present invention is applied.
2 is an exploded cross-sectional view of the viscous rubber damper of FIG. 1 before assembly.
FIG. 3 is a graph showing the relationship between the amount of chloranil and compression set.
FIG. 4 is a graph showing the relationship between the amount of stearic acid blended, the amount of precipitation on the surface, and the adhesion strength.
[Explanation of symbols]
12 Hub plate (hub part)
14 Rubber ring (vulcanized rubber part)
16 First inertia ring (damper mass part)
18 Second inertia ring (damper mass part)
22 Viscous fluid part
24 Elastic membrane cap

Claims (4)

A hub portion assembled to the rotating shaft, a vulcanized rubber portion fixed to at least one surface of the hub portion, a damper mass portion (inertial body) fixed to the vulcanized rubber portion, and the above three members. In a viscous rubber damper comprising a viscous fluid portion that fills the gap, and the vulcanized rubber portion is based on a nonpolar rubber and is formed of a rubber compound containing a higher fatty acid-based processing aid,
The vulcanized rubber part is fixed via a fixing layer (bonding layer) comprising a hub part and / or a damper mass part and a moisture curable adhesive,
The moisture-curing adhesive comprises (A) component: a liquid diene-based high polymer having a hydroxyl group at the terminal, and (B) component: a molecular weight of 50 to 500 containing a hydroxyl group bonded to at least one secondary carbon. Polyol and component (C): produced by reacting an organic polyisocyanate compound in the presence of an ester plasticizer, and the OH group content of component (A) and OH of component (B) The ratio with the group content is the former / the latter = 1 / 0.5 to 1 / 2.5,
A viscous rubber damper , wherein the rubber compound contains an organic vulcanizing agent capable of reacting with the nonpolar rubber during vulcanization and having a polar group . 2. The viscous rubber damper according to claim 1 , wherein the organic vulcanizing agent is a quinone derivative having a halogen group introduced therein . The nonpolar rubber is an ethylene propylene rubber, the processing aid is stearic acid, and the quinone derivative is chloranil (compound name: 2,3,5,6-tetrachloroquinone). The viscous rubber damper according to claim 1 or 2. The lower limit compounding amount of the stearic acid and the upper compounding amount of the chloranil are 0.4 parts by mass and 0.7 parts by mass, respectively, with respect to 100 parts by mass of the ethylene propylene rubber. Viscous rubber damper as described.

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