Vibration-damping structures, methods using thermoplastic resin compositions, and automotive mounting parts

Abstract

The object of the present invention is to provide a vibration-damping structure that has a high vibration-damping effect over a wide frequency range. [Solution] The vibration-damping structure of the present invention comprises a member containing metal, a member containing elastomer, and a member containing a thermoplastic resin composition, wherein the member containing elastomer and the member containing the thermoplastic resin composition are in contact, the volume ratio of the member containing the thermoplastic resin composition to 100 volume% of the member containing elastomer is 25 volume% or more, and the loss modulus of elasticity of the thermoplastic resin composition is 100 MPa or more at frequencies of 1 to 10000 Hz.

Description

Technical Field

[0001] The present invention relates to a vibration isolation structure, a method of using a thermoplastic resin composition, and an automotive mount part.

Background Art

[0002] A vibration isolation structure may be used for the purpose of suppressing vibration. For example, in an automobile, an engine mount for controlling the vibration of an engine, a motor mount for controlling the vibration of a motor, etc. may be used.

[0003] Conventionally, as a vibration isolation structure, a structure composed of a metal and an elastomer is known. Since this structure contains a metal, it is excellent in strength, and the effect of vibration attenuation by the elastomer can also be obtained.

Prior Art Documents

Patent Documents

[0004] ]]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] Patent Document 1 describes an engine mount for an automobile including a cylindrical bush in which an inner cylinder and an outer cylinder are joined by an elastic member having a groove. The cylindrical bush is bolted and fixed to a vehicle body component. The cylindrical bush has a mounting rubber inserted and disposed between a cylindrical inner cylinder and a cylindrical outer cylinder, and the mounting rubber is joined to the inner cylinder and the outer cylinder by vulcanization adhesion. However, although the engine mount described in Patent Document 1 vulcanizes and adheres the mounting rubber, it does not consider the vibration attenuation effect at all. Since the ratio of the adhesive part is extremely small, it is impossible to suppress vibrations at frequencies that cannot be attenuated by the mounting rubber at the adhesive part.

[0006] Therefore, the object of the present invention is to provide a vibration-damping structure that has a high vibration-damping effect over a wide frequency range. [Means for solving the problem]

[0007] In other words, the present invention is as follows: [1] It has a component containing metal, a component containing elastomer, and a component containing a thermoplastic resin composition, A member containing the above-mentioned elastomer and a member containing the above-mentioned thermoplastic resin composition are in contact with each other. The volume ratio of the component containing the thermoplastic resin composition to 100% by volume of the component containing the elastomer is 25% by volume or more. The loss modulus of the above thermoplastic resin composition is 100 MPa or more at frequencies of 1 to 10000 Hz. Vibration isolation structure. [2] The vibration-damping structure according to [1], comprising the above thermoplastic resin composition with polyamide. [3] A vibration isolation structure having a metal-containing member, an elastomer-containing member, and a thermoplastic resin composition-containing member, wherein the elastomer-containing member and the thermoplastic resin composition-containing member are in contact, and the volume ratio of the thermoplastic resin composition-containing member to 100% by volume of the elastomer-containing member is 25% by volume or more, wherein a thermoplastic resin composition having a loss modulus of elasticity of 100 MPa or more at frequencies of 1 to 10000 Hz is used to improve vibration isolation performance. [4] Automotive mounting component including the vibration-damping structure described in [1] or [2]. [Effects of the Invention]

[0008] Because the vibration-damping structure of the present invention has the above configuration, it has a high vibration-damping effect over a wide frequency range. [Brief explanation of the drawing]

[0009] [Figure 1]This is the vibration isolation structure of Example 1. (A) is a perspective view, (B) is a front view, and (C) is a perspective view of the member containing the elastomer and the member containing the thermoplastic resin composition. [Figure 2] This is the structure of Comparative Example 1. (A) is a front view, and (B) is a perspective view of the member containing the elastomer. [Figure 3] These are graphs showing the measurement results of the elastic modulus of LEONA, SG104, and the conjugated diene polymer composition used in the examples and comparative examples. (A) is the graph for LEONA and SG104, and (B) is the graph for the conjugated diene polymer composition. [Figure 4] The following are the measurement results for the vibration isolation performance of Example 1 and Comparative Example 1. (A) is an explanatory diagram of the excitation conditions given during measurement, and (B) is the measurement result. [Modes for carrying out the invention]

[0010] The embodiments for carrying out the present invention will be described in detail below. However, the present invention is not limited to the following description and can be implemented in various modifications within the scope of its essence.

[0011] [Vibration-damping structure] The vibration-damping structure of this embodiment comprises a member containing metal, a member containing elastomer, and a member containing a thermoplastic resin composition, wherein the member containing elastomer and the member containing the thermoplastic resin composition are in contact, the volume ratio of the member containing the thermoplastic resin composition to 100% by volume of the member containing elastomer is 25% by volume or more, and the loss modulus of elasticity of the thermoplastic resin composition is 100 MPa or more at frequencies of 1 to 10000 Hz.

[0012] In this embodiment of vibration isolation structure, since the member containing the elastomer and the member containing the thermoplastic resin composition are in contact, vibrations in frequency ranges that could not be suppressed by the member containing the elastomer can be suppressed by the adjacent member containing the thermoplastic resin composition. As a result, vibrations are not transmitted over a wide area, and the vibration suppression effect is significant. In addition, since the volume ratio of the member containing the above thermoplastic resin composition with respect to 100% by volume of the member containing the above elastomer is 25% by volume or more, a vibration damping effect by the thermoplastic resin can be obtained. Also, since the loss elastic modulus of the above thermoplastic resin composition is 100 MPa or more at frequencies of 1 to 10,000 Hz, vibrations in the frequency range that could not be suppressed by the elastomer can be suppressed by the member containing the thermoplastic resin composition.

[0013] The vibration damping structure of the present embodiment may be a structure composed only of a member containing a metal, a member containing an elastomer, and a member containing a thermoplastic resin composition, or may further contain other members. The member containing the above metal, the member containing the above elastomer, and the member containing the above thermoplastic resin composition included in the vibration damping structure of the present embodiment may each be one, or may be plural. When there are plural, the composition, the content ratio of the material, the shape, etc. of each member may be the same or different. In this specification, the "member containing ~" may be a member containing the material with the largest volume ratio in the member. For example, in a member containing a metal, an elastomer, a thermoplastic resin composition, and other components, when the volume ratio of the metal in the member is the largest, the member is regarded as a member containing a metal.

[0014] (Member containing a metal) In the member containing the above metal, the volume ratio of the metal with respect to 100% by volume of the member is preferably more than 50% by volume, more preferably 70% by volume or more, still more preferably 90% by volume or more, still more preferably 95% by volume or more, particularly preferably 99% by volume or more. Also, the member containing the above metal may be a member composed only of a metal. When the volume ratio of the metal in the member containing the above metal is within the above range, it is excellent in rigidity and strength. Also, in the member containing the above metal, the mass ratio of the metal with respect to 100% by mass of the member is preferably more than 50% by mass, more preferably 70% by mass or more, still more preferably 90% by mass or more, still more preferably 95% by mass or more, particularly preferably 99% by mass or more.

[0015] Examples of the above metals include iron, steel, high-tensile steel, stainless steel, aluminum, aluminum alloys, magnesium, magnesium alloys, copper, copper alloys, titanium, and titanium alloys. Among these, iron and aluminum alloys are preferred from the viewpoint of rigidity, strength, and cost. The above metals can be used individually or in combination.

[0016] Other components besides the metals included in the metal-containing component include thermoplastic resins and the like.

[0017] (Components containing elastomer) In the member containing the elastomer described above, the volume ratio of the elastomer to 100 volume of the member is preferably more than 25 volume%, more preferably 30 volume% or more, even more preferably 35 volume% or more, even more preferably 45 volume% or more, and particularly preferably 50 volume% or more. Furthermore, the member containing the elastomer may consist solely of the elastomer. By having the volume ratio of the elastomer in the member containing the elastomer within the above range, an excellent balance between load-bearing capacity and vibration damping is achieved. In the member containing the elastomer described above, the mass ratio of the elastomer to 100% by mass of the member is preferably more than 35% by mass, more preferably 40% by mass or more, even more preferably 45% by mass or more, even more preferably 50% by mass or more, and particularly preferably 55% by mass or more.

[0018] The elastomers mentioned above are preferably natural rubber, conjugated diene polymers, or thermoplastic elastomers. One or more of these elastomers can be used in combination. A conjugated diene polymer contains structural units derived from a conjugated diene compound, and may also contain structural units derived from an aromatic vinyl compound. Examples of conjugated diene compounds include, but are not limited to, 1,3-butadiene, isoprene, 2,3-dimethyl-1,3-butadiene, 1,3-pentadiene, 3-methyl-1,3-pentadiene, 1,3-hexadiene, and 1,3-heptadiene. Among these, 1,3-butadiene and isoprene are preferred from the viewpoint of ease of industrial availability, and 1,3-butadiene is particularly preferred. These may be used individually or in combination of two or more types. Furthermore, aromatic vinyl compounds include, but are not limited to, styrene, p-methylstyrene, α-methylstyrene, vinylethylbenzene, vinylxylene, vinylnaphthalene, and diphenylethylene. Among these, styrene is preferred from the viewpoint of ease of industrial availability. These may be used individually or in combination of two or more types. The above-mentioned conjugated diene polymers include, for example, polybutadiene polymers, polyisoprene polymers, styrene-butadiene copolymers, isoprene-styrene copolymers, butadiene-styrene-isoprene copolymers, and hydrogenated polymers obtained by hydrogenating the above polymers. Examples of the above-mentioned thermoplastic elastomers include olefin-based thermoplastic elastomers, polyvinyl chloride-based thermoplastic elastomers, polyester-based thermoplastic elastomers, polyurethane-based thermoplastic elastomers, polyamide-based thermoplastic elastomers, and styrene-based thermoplastic elastomers. Among these, natural rubber, polybutadiene polymer, polyisoprene polymer, and styrene-butadiene copolymer are preferred from the viewpoint of excellent vibration damping. The above elastomers can be used individually or in combination of more than one type.

[0019] Other components included in the component containing the above-mentioned elastomer include (fillers, crosslinking agents such as sulfur, vulcanization aids, softeners, heat-resistant stabilizers, antistatic agents, weather-resistant stabilizers, colorants, and lubricants).

[0020] (Component containing a thermoplastic resin composition) The volume ratio of the thermoplastic resin to 100% by volume of the above thermoplastic resin composition is preferably more than 50% by volume, more preferably 70% by volume or more, even more preferably 90% by volume or more, even more preferably 95% by volume or more, and particularly preferably 99% by volume or more. It may also be 100% by volume. When the volume ratio of the thermoplastic resin in the above thermoplastic resin composition is within the above range, the vibration damping performance is further improved over a wide frequency range. The volume ratio of the thermoplastic resin composition to 100% by volume of the member containing the above thermoplastic resin composition is preferably more than 50% by volume, more preferably 70% by volume or more, even more preferably 90% by volume or more, even more preferably 95% by volume or more, and particularly preferably 99% by volume or more. It may also be 100% by volume. When the volume ratio of the thermoplastic resin composition in the member containing the above thermoplastic resin composition is within the above range, the vibration isolation performance is further improved over a wide frequency range. The mass ratio of the thermoplastic resin to 100% by mass of the above thermoplastic resin composition is preferably more than 50% by mass, more preferably 70% by mass or more, even more preferably 90% by mass or more, even more preferably 95% by mass or more, and particularly preferably 99% by mass or more.

[0021] Examples of the thermoplastic resins mentioned above include polyamides such as aliphatic polyamides like polyamide 6, polyamide 12, and polyamide 66, and aromatic polyamides such as polyamide 4T, polyamide 6T, polyamide 9T, and polyamide 10T; olefin resins such as polypropylene, propylene-ethylene block copolymer, propylene-ethylene random copolymer, high-density polyethylene, and low-density polyethylene; styrene resins such as polystyrene, rubber-modified impact-resistant polystyrene, polystyrene containing a syndiotactic structure, ABS resin, and AS resin; polycarbonate resins; polyester resins such as polyethylene terephthalate, polybutylene terephthalate, and poly(ethylene 2,6-naphthalate); (meth)acrylic resins such as polymethyl methacrylate; polyvinyl chloride resins; polyacetal resins; polyaromatic ethers; thioether resins; polyaromatic ester resins; and polysulfone resins. Among these, polyamides are preferred, and more preferably, an alloy of semi-aromatic polyamide and polyamide 66 or polyamide 6, from the viewpoint of even better vibration damping over a wide frequency range. The above thermoplastic resins can be used individually or in combination of multiple types. In this specification, the thermoplastic resin does not include the thermoplastic elastomer.

[0022] The loss modulus of the thermoplastic resin composition is preferably 100 MPa or more, more preferably 150 MPa or more, even more preferably 200 MPa or more, and may be 1000 MPa or less at frequencies of 1 to 10000 Hz. Here, "100 MPa or more at frequencies from 1 to 10000 Hz" means that the loss modulus of elasticity is 100 MPa or more across the entire frequency range from 1 to 10000 Hz. The above loss modulus can be measured by the method described in the examples below.

[0023] Other components of the thermoplastic resin composition include fillers, crosslinking agents such as sulfur, vulcanization aids, softeners, heat-resistant stabilizers, antistatic agents, weather-resistant stabilizers, colorants, and lubricants.

[0024] Examples of the above-mentioned fillers include glass fibers, carbon fibers, carbon particles, cellulose fibers, clay, talc, silica, carbon black, and calcium carbonate. Among these, carbon black and silica are preferred from the viewpoint of balancing load-bearing capacity and vibration damping. The above-mentioned fillers can be used individually or in combination.

[0025] The volume ratios of each component of the vibration-damping structure in this embodiment will now be explained.

[0026] From the viewpoint of excellent vibration damping over a wide frequency range, the volume ratio of the member containing the thermoplastic resin composition to 100 volume% of the member containing the elastomer is 25 volume% or more, preferably 25 to 75 volume%, and more preferably 30 to 40 volume%.

[0027] The total volume ratio of the member containing the elastomer and the member containing the thermoplastic resin composition relative to 100% volume of the vibration-damping structure of this embodiment is preferably 10 to 90% volume, and more preferably 20 to 60% volume. When the total volume ratio of the member containing the elastomer and the member containing the thermoplastic resin composition in the vibration-damping structure is within this range, the vibration-damping performance is further improved over a wide frequency range.

[0028] The volume ratio of the component containing the thermoplastic resin composition to 100% by volume of the vibration-damping structure in this embodiment is preferably 5 to 90% by volume, and more preferably 10 to 50% by volume. When the volume ratio of the component containing the thermoplastic resin composition in the vibration-damping structure is within this range, excellent attenuation is achieved over a wide frequency range. The volume ratio of the elastomer-containing member to 100% of the vibration-damping structure in this embodiment is preferably 5 to 60% by volume, and more preferably 10 to 40% by volume. When the volume ratio of the elastomer-containing member in the vibration-damping structure is within this range, the vibration-damping performance is excellent. The volume ratio of the metal-containing member to 100% of the vibration-damping structure in this embodiment is preferably 20 to 90% by volume, and more preferably 40 to 70% by volume. When the volume ratio of the metal-containing member in the vibration-damping structure is within this range, the rigidity and strength are excellent.

[0029] The structure of the vibration isolation structure of this embodiment will now be described.

[0030] The shape of the vibration-damping structure in this embodiment is not particularly limited. Furthermore, the vibration-damping structure in this embodiment may be a structure attached to a vibration source such as an engine or motor (i.e., a structure that is a single component), or it may be a part of a vibration source embedded integrally with the vibration source, or a part of a vehicle body structure embedded integrally with a vehicle body structure such as an automobile part (i.e., an embedded structure).

[0031] An example of the vibration isolation structure of this embodiment will be explained using Figure 1. The vibration isolation structure 1 of this embodiment may be a structure that surrounds a vibration source. Here, the vibration source may be a member or the like that applies vibration to the vibration isolation structure 1 shown in Figure 1(A). The vibration isolation structure 1 of this embodiment may have a structure in which a member 2 containing the above-mentioned metal is arranged around the vibration source, a member 3 containing the above-mentioned elastomer is arranged around the elastomer, and a member 4 containing the above-mentioned thermoplastic resin composition is arranged further outside of that (Figure 1(B)). Furthermore, from the viewpoint of superior strength, a member 2 containing the metal may be arranged further outside the member 4 containing the thermoplastic resin composition. With this structure, it is possible to have a structure that has strength that makes it difficult for the vibration source to be damaged by vibration, and that prevents vibration from spreading to the area around the vibration source.

[0032] In this embodiment, the vibration-damping structure 1 has a member 3 containing the elastomer and a member 4 containing the thermoplastic resin composition in contact with each other. It is sufficient that a portion of the surface of the member 3 containing the elastomer is in contact with the member 4 containing the thermoplastic resin composition (Figure 1(A)(B)).

[0033] In this embodiment, it is preferable that the vibration isolation structure 1 has a structure in which the member 3 containing the elastomer and the member 4 containing the thermoplastic resin composition are bonded together in a direction toward a point on the outer circumference of the vibration isolation structure from the vibration source (Figure 1(A)(B)). In particular, from the viewpoint of being able to suppress vibrations over a wide frequency range more efficiently, it is more preferable that in this structure the member 3 containing the elastomer is on the vibration source side and the member 4 containing the thermoplastic resin composition is on the outer circumference side. In Figure 1(A), the evaluation point is an example of a point on the outer circumference of the vibration-isolating structure. This single point on the outer circumference of the vibration-isolating structure may be used as an evaluation point in the vibration-isolating performance evaluation described later.

[0034] In the vibration-damping structure 1 of this embodiment, the metal-containing member 2 may be provided in contact with the elastomer-containing member 3, or in contact with the thermoplastic resin composition-containing member 4. In particular, the metal-containing member 2 may be provided in contact with the elastomer-containing member 3, in contact with the thermoplastic resin composition-containing member 4, or in contact with both (Figure 1(A)(B)).

[0035] From the viewpoint of having excellent vibration isolation over a wide frequency range, it is preferable that the vibration isolation structure 1 of this embodiment has a structure in which the metal-containing member 2, the elastomer-containing member 3, and the thermoplastic resin composition-containing member 4 are in contact in this order in the direction from the vibration source toward a point on the outer circumference of the vibration isolation structure. The vibration isolation structure 1 of this embodiment may include two or more vibration sources. In that case, it is preferable that at least one or more vibration sources have the above structure.

[0036] The above-mentioned direction from a vibration source that satisfies the preferred requirements to a point on the outer periphery of the vibration isolation structure only needs to be at least one of all directions extending outward from the vibration source, and it is more preferable that there be multiple such directions. Here, "all directions extending outward from the vibration source" refers to the directions in which vibrations spread spherically from the vibration source. In this embodiment, it is preferable that the vibration isolation structure has a cross section passing through the vibration source, where the proportion of the above-mentioned preferred conditions being met when all directions from the vibration source toward a point on the outer circumference of the vibration isolation structure are defined as 360° from the vibration source to the outer circumference is within the range of 1 to 100% (preferably 30 to 100%, more preferably 50 to 100%).

[0037] The metal-containing member, the elastomer-containing member, and the thermoplastic resin composition-containing member may have fragile parts. Having these fragile parts improves the overall safety of the object, including the vibration-damping structure of this embodiment, by allowing these fragile parts to break when large vibrations or impacts occur. Examples of fragile parts include thin parts (for example, parts with a thickness of 10 mm or less), lattice-like parts (for example, parts where the volume ratio of cavities is 70% or more by volume), and parts with low strength (for example, parts of a thermoplastic resin composition surrounded by a metal-containing component, and parts with a shape that is prone to stress concentration).

[0038] A method for manufacturing the vibration-damping structure of this embodiment will be described.

[0039] The vibration-damping structure of this embodiment can be manufactured, for example, by manufacturing components such as a component containing the above-mentioned metal, a component containing the above-mentioned elastomer, and a component containing the above-mentioned thermoplastic resin composition, and then bonding each component together with adhesive, heat welding, or the like.

[0040] [Automotive mounting components] The automobile mounting member of this embodiment includes the vibration isolation structure of this embodiment described above. The automobile mounting member of this embodiment may consist only of the vibration isolation structure, or it may include other structures. Examples of the above-mentioned automotive mounting components include motors such as eAxles, engines, compressors, and so on.

[0041] [A method using a thermoplastic resin composition having a loss modulus of elasticity of 100 MPa or more at frequencies of 1 to 10000 Hz] The method of using a thermoplastic resin composition having a loss modulus of elasticity of 100 MPa or more at frequencies of 1 to 10000 Hz in this embodiment is a method of using the resin to improve vibration isolation performance in a vibration isolation structure having a member containing metal, a member containing elastomer, and a member containing the thermoplastic resin composition, wherein the member containing the elastomer and the member containing the thermoplastic resin composition are in contact, and the volume ratio of the member containing the thermoplastic resin composition to 100 volume% of the member containing the elastomer is 25 volume% or more.

[0042] In the method using the above-mentioned resin, the vibration isolation structure can be the same as the vibration isolation structure of this embodiment described above, and the same can be said for preferred examples.

[0043] In the method using the above resin, it is preferable to use the above resin as a raw material for a component containing the above thermoplastic resin composition, and more preferably to use it only as a raw material for a component containing the above thermoplastic resin composition. [Examples]

[0044] The present invention will be described in more detail below based on examples, but the present invention is not limited to these examples.

[0045] (Example 1) Vibration simulations were performed under the following conditions. Density 2700kg / m 3 A metal component made of aluminum alloy (E=70GPa, damping coefficient=0.0035), density 1200kg / m³ 3 A component containing an elastomer using the conjugated diene polymer composition described later, and a density of 1460 kg / m³ 3A vibration isolation structure model (Model-9a) shown in Figures 1(A) and 1(B) was used, which consisted of a component containing a thermoplastic resin composition using the product name "LEONA, SG104" (manufactured by Asahi Kasei Corporation). The volume ratio of the component containing the thermoplastic resin composition to the elastomer component of Example 1 was 31% by volume. Figure 1(C) is a perspective view of the component containing the elastomer and the component containing the thermoplastic resin composition in Model-9a.

[0046] (Comparative Example 1) Density 2700kg / m 3 A metal component using an aluminum alloy, and a density of 1200 kg / m³ 3 A vibration isolation structure model (Model-6) shown in Figure 2(A) was used, which consists of a member containing an elastomer made from a conjugated diene polymer composition described later. Figure 2(B) is a perspective view of the member containing the elastomer in Model-6. (Conjugated diene polymer composition) Conjugated diene polymer (manufactured by Asahi Kasei Corporation, low-cis polybutadiene, NF55AE): 100.0 parts by mass Carbon black (manufactured by Tokai Carbon Co., Ltd., Seest SO (N550)): 50.0 parts by mass Naphthenic oil (manufactured by Idemitsu Kosan Co., Ltd., Diana Process NM-280): 10.0 parts by mass Zinc white: 5.0 parts by mass Stearic acid: 1.0 part by mass Anti-aging agent (Nocrac 6C): 2.0 parts by mass Anti-aging agent (Nocrac MB): 1.0 parts by mass Wax (manufactured by Ouchi Shinko Chemical Co., Ltd., Sunnock N): 2.0 parts by mass Sulfur: 2.5 parts by mass Vulcanization accelerator (N-(tert-butyl)-2-benzothiazole sulfenamide): 1.5 parts by mass Total: 175.0 parts by mass Of the raw materials listed above, raw rubber, carbon black, naphthenic oil, zinc oxide, stearic acid, antioxidant, and wax were mixed in a closed kneader, and then sulfur and vulcanization accelerator were further mixed in an open roll to obtain a conjugated diene polymer composition.

[0047] [evaluation] (Loss modulus of elasticity) The above conjugated diene polymer composition was extruded and then vulcanized at 160°C for 20 minutes. In addition, LEONA and SG104 were molded at a resin temperature of 290°C, a mold temperature of 120°C, a maximum injection pressure of 150 MPa, a holding pressure of 20 MPa for 15 seconds, and an injection speed of 20 mm / second to prepare test specimens measuring 10 mm × 40 mm × 4 mm. The following measurements were taken using a melt viscoelasticity measuring device (product name "EPLEXOR," manufactured by GABO). Frequency range: 1 × 10 -1 ~1 × 10 5 Hz Measurement temperature: 23~26℃ Moisture content: 1.4~1.6% by mass The results are shown in Figures 3(A) and 3(B). For LEONA and SG104, the loss modulus of elasticity E'' was 100 MPa or higher across the entire frequency range from 1 to 10000 Hz.

[0048] (Vibration damping) The vibration isolation structures fabricated in the examples and comparative examples were fixed at three points (Figures 1(A) and 2(A)), and vibration was applied to the excitation points under the conditions shown in Figure 4(A). The acceleration at each frequency was then measured at the evaluation point shown in Figure 1(A). In Comparative Example 1, Model-6, the same position as in Figure 1(A) was used as the evaluation point. The results are shown in Figure 4(B). The vibration isolation structures of Example 1 and Comparative Example 1 had similar vibration responses (damping performance) in the 2000-4000 Hz range, but the vibration isolation structure of Example 1 (Model-9a) was able to significantly reduce the response at natural frequencies occurring around 5000 Hz. [Explanation of symbols]

[0049] 1. Vibration isolation structure 2. Metal-containing components 3. Components containing elastomer 4. Components containing thermoplastic resin composition

Claims

1. It has a component containing metal, a component containing elastomer, and a component containing a thermoplastic resin composition, The member containing the elastomer and the member containing the thermoplastic resin composition are in contact with each other. The volume ratio of the member containing the thermoplastic resin composition to 100% by volume of the member containing the elastomer is 25% by volume or more, and the loss modulus of the thermoplastic resin composition is 100 MPa or more at frequencies of 1 to 10000 Hz. Vibration isolation structure.

2. The vibration-damping structure according to claim 1, wherein the thermoplastic resin composition comprises a polyamide.

3. A vibration isolation structure having a metal-containing member, an elastomer-containing member, and a thermoplastic resin composition-containing member, wherein the elastomer-containing member and the thermoplastic resin composition-containing member are in contact, and the volume ratio of the thermoplastic resin composition-containing member to 100% by volume of the elastomer-containing member is 25% by volume or more, wherein a method for improving vibration isolation performance is used, wherein the thermoplastic resin composition has a loss modulus of elasticity of 100 MPa or more at frequencies of 1 to 10000 Hz.

4. An automobile mounting component comprising the vibration-damping structure described in claim 1 or 2.

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