JP2009208009A - Insulator for internal-combustion engine and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an insulator for an internal-combustion engine which is made lightweight, has satisfactory heat shielding properties and is made practicable and to provide a method for manufacturing the insulator for the internal-combustion engine. <P>SOLUTION: A layer 3 of silicone rubber or a silicone resin is arranged on the surface of a metallic plate material 2 constituting the insulator 1 or 1A for the metal-made internal-combustion engine, which insulator covers a part or the whole of the vehicle-mounted internal-combustion engine, so that an shielding effect of the heat radiated from the internal-combustion engine is improved remarkably. A foamable filler 4 for forming air bubbles or balloons is incorporated into the layer 3A of silicone rubber or the silicone resin to improve the heat insulation properties much more and make the insulator lightweight much more. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an insulator for an internal combustion engine that covers part or all of an internal combustion engine mounted on a vehicle and performs heat insulation, sound insulation, and vibration isolation, and a method for manufacturing the same.

  In an internal combustion engine mounted on a vehicle, heat generated by the combustion of fuel in the cylinder, and noise and vibration generated during combustion of the fuel and piston and crank movements are not detected in the control device of the internal combustion engine or in the engine room. Insulators for heat insulation and sound / vibration prevention are provided so as not to adversely affect the apparatus. Insulators for internal combustion engines are often made of metal in consideration of heat resistance.

  As one of the insulators for the internal combustion engine, for a sound and heat insulation plate excellent in sound insulation, heat insulation and durability, a molded metal substrate and alumina, silica-alumina, glass provided on the surface of the metal substrate Three-dimensional soundproofing composed of an inorganic sound absorbing material formed of inorganic fibers such as rock wool, a metal mesh disposed on the surface of the inorganic sound absorbing material, and a metal reinforcing plate partially disposed on the metal mesh A heat shield has been proposed (see, for example, Patent Document 1).

  However, this sound and heat insulation board is not intended to be light weight, uses a relatively large specific gravity metal substrate, wire mesh, metal reinforcement plate and adopts a welded structure. There is a problem that it takes.

  On the other hand, the body of an internal combustion engine has been remarkably reduced in weight from the viewpoint of energy saving measures, and the engine body has also changed from cast iron to aluminum alloy, and the weight ratio of the insulator has increased relatively. For example, the weight of the engine body is 25 kg. Even if it is about f, the insulator is 500 g. f to 1000 g. Depending on the combination, the weight of the insulator may be about 4% of the whole. Therefore, the weight reduction of the insulator for the internal combustion engine plays a major role in reducing the weight of the engine body.

Insulators for internal combustion engines are mainly steel plates, stainless steel plates, and aluminum-plated steel plates with a specific gravity of about 7.9, and recently, those made of aluminum or aluminum alloys with a specific gravity of about 2.8 are also on the market. However, when considering weight reduction, the specific gravity is still large.
Japanese Patent Application Laid-Open No. 07-277811

  The present invention has been made in view of the above situation, and an object of the present invention is to provide a practical insulator for an internal combustion engine that is lightweight and has sufficient heat shielding properties, and a method for manufacturing the same.

  To achieve the above object, an insulator for an internal combustion engine according to the present invention is a metal internal combustion engine insulator covering a part or all of an internal combustion engine mounted on a vehicle, and a surface of a metal plate material constituting the internal combustion engine insulator. Are provided with a layer of silicone rubber or silicone resin. With this configuration, the silicone rubber or silicone resin layer has a low thermal conductivity, and is rich in sound and vibration absorption, so that the effect of blocking heat dissipation from the internal combustion engine can be remarkably improved. The insulator for an internal combustion engine is excellent in function and vibration function.

  In recent years, this silicone rubber or silicone resin has improved adhesion to metal plate materials and is not easily peeled off like heat-resistant inorganic materials such as fluororubber, so a layer can be formed only by application or the like, Manufacturing is easy. Moreover, since it becomes unnecessary to fix to the metal plate material by bolting compared to the pasting of the inorganic material, it is possible to avoid the occurrence of chatter noise from this portion.

  This silicone rubber refers to a rubber-like synthetic resin mainly composed of silicone (a resin mainly composed of a silicon compound), has high heat resistance, and the usable temperature in a short time is 250. It is up to about ℃. The silicone rubber can be bonded to the metal plate simply by extruding it from the container. It can be bonded to most materials at the same time as curing, and then mixed with a one-component type that becomes a rubber elastic body after curing. A two-part silicone liquid rubber that cures by stirring and becomes a rubber elastic body after curing can be used.

  In addition, the silicone resin layer can be formed with a silicone paint (silicon paint) containing silicone as the main component. The silicone paint is applied to the metal plate as a main component, and a reactive coating film based on a siloxane bond. A two-component reaction type paint having good adhesion to a metal material can be used.

  In the insulator for an internal combustion engine, the silicone rubber or silicone resin layer is provided on the surface of the metal plate opposite to the internal combustion engine. By providing a coating layer of thermal barrier coating or heat insulating coating on the side opposite to the internal combustion engine, the temperature of this coating layer does not rise compared to the case where it is provided on the internal combustion engine side, so that it can be used up to a higher temperature. become.

  In the above-described insulator for an internal combustion engine, the silicone rubber or silicone resin layer is configured to contain bubbles or a balloon-type filler. The air bubbles can be easily included by applying a foaming agent to a silicone rubber or a silicone paint when the metal plate material is coated and foaming. Moreover, as balloon-type (hollow foam particles) fillers, glass, resin, and shirasu (volcanic ash) micro-balloons can be used. When these balloon-type fillers are applied to a metal plate, Can be included by adding to the silicone rubber or silicone paint. With these configurations, it is possible to further improve heat insulation and reduce the weight of the insulator for an internal combustion engine.

  Furthermore, as a metal plate material, when weight reduction is regarded as important, an aluminum plate or an aluminum alloy plate having a small specific gravity can be used, and when strength is required, an aluminum plated steel plate should be used. Can do.

  And the manufacturing method of said insulator for internal combustion engines is characterized by coating a metal plate material with silicone rubber or silicone paint. By the method for manufacturing an insulator for an internal combustion engine, the above-described insulator for an internal combustion engine can be easily manufactured.

  According to the insulator for an internal combustion engine of the present invention, the surface of the metal plate material constituting the internal combustion engine insulator is provided with a layer of silicone rubber or silicone resin having low thermal conductivity and high sound and vibration absorption. As a result, the effect of blocking heat dissipation from the internal combustion engine can be remarkably improved, and an insulator for an internal combustion engine having an excellent soundproofing function and vibration function can be obtained. In addition, since the heat dissipation effect from the internal combustion engine can be remarkably improved, the insulator for the internal combustion engine can be formed thin. As a result, it is possible to improve heat insulation, reduce weight, reduce costs, and reduce vibration in an insulator for an internal combustion engine.

  Next, an embodiment of an insulator for an internal combustion engine and a method for manufacturing the same according to the present invention will be described with reference to the drawings. FIG. 1 or FIG. 2 is a schematic partial enlarged view showing a part of the cross section of the insulator 1 for an internal combustion engine. For the sake of explanation, the thickness of the metal plate 2 and the silicone rubber or silicone resin 3, bubbles or The ratio to the size of the filler 4 is shown separately from the actual one.

  An insulator 1 for an internal combustion engine according to a first embodiment of the present invention is formed as an insulator that covers part or all of an engine body such as an exhaust manifold, an EGR passage, a turbocharger, and an exhaust pipe of an internal combustion engine (engine). The

  As shown in FIG. 1, the insulator 1 for an internal combustion engine is formed by providing a layer 3 of silicone rubber or silicone resin on the surface of a metal plate 2. As the metal plate material 2, aluminum or aluminum alloy having a small specific gravity is used to reduce the weight. Alternatively, a thin aluminized steel plate is used when strength is required.

  This silicone rubber is a rubber-like synthetic resin mainly composed of silicone, has high heat resistance, and can be used in a short time up to about 250 ° C. Silicone is a resin mainly composed of a silicon compound. The silicone rubber can be bonded to the metal plate 2 simply by extruding it from a container such as a tube or a cartridge, and it adheres well to most materials at the same time as it is cured. A two-pack type silicone liquid rubber that cures by mixing and stirring the main agent and the curing agent and becomes a rubber elastic body after curing can be used.

  Further, in the case of a silicone resin, it can be provided by coating the metal plate 2 with a silicone paint mainly composed of silicone. As this silicone coating material, a two-component reaction type coating material that has a silicone acrylic resin as a main component and forms a reactive coating film by a siloxane bond can be used. This two-component reaction type is said to have good adhesion to metal materials.

  Since the silicone rubber or silicone resin layer 3 can be applied in the same manner as a normal paint, the insulator 1 for an internal combustion engine is formed by pressing a metal plate material 2 by press working or the like, and the metal plate material 2 after this molding is performed. It can be easily manufactured by applying a layer 3 of silicone rubber or silicone resin to the surface of the internal combustion engine side by a known method. Alternatively, the insulator 3 for an internal combustion engine is manufactured by applying a silicone rubber or silicone resin layer 3 to the metal plate 2 by a well-known method and then forming it by press working or the like.

  According to this configuration, the heat radiation from the internal combustion engine is blocked by providing the silicone rubber or silicone resin layer 3 which has an excellent effect on shielding of radiant heat transfer on the surface of the metal plate 2 on the internal combustion engine side. Therefore, the heat shielding effect by the insulator 1 for internal combustion engines can be remarkably improved, the thickness of the metal plate material 2 portion of the insulator 1 for internal combustion engines can be reduced, and the weight can be reduced. Further, when the silicone rubber or silicone resin layer 3 is provided on the side opposite to the internal combustion engine, the temperature of the silicone rubber or silicone resin layer 3 does not increase as compared with the case where the silicone rubber or silicone resin layer 3 is provided on the internal combustion engine side. Can be used until.

  Next, an internal combustion engine insulator 1A according to a second embodiment will be described. In the internal combustion engine insulator 1A, as shown in FIG. 2, bubbles or balloon-type fillers 4 are included in the silicone rubber or silicone resin layer 3A of the internal combustion engine insulator 1 of the first embodiment.

  When this bubble is included, when the silicone rubber or silicone resin layer 3A is formed on the metal plate 2 by coating, the silicone rubber or silicone paint (or silicone resin) is coated with an organic foaming agent or an inorganic foam. Air bubbles can be easily included by coating with an agent and heating to generate gas and foam. In addition, there is also a type in which a two-component self-foaming reaction type liquid silicone is foamed by starting the reaction by mixing and stirring the two liquids.

  Further, as balloon-type (hollow foam particles) fillers, glass, resin, and shirasu (volcanic ash) micro-balloons can be used, and these balloon-type fillers are coated on the metal plate 2. In addition, it can be included by mixing and stirring in addition to silicone rubber or silicone paint.

  Since the silicone rubber or silicone resin layer 3A containing the foaming agent or balloon-like filler 4 can be formed by applying in the same manner as a normal paint, the internal combustion engine insulator 1A is made of a metal plate 2 Is formed by pressing or the like, and a layer 3A of silicone rubber or silicone resin containing this foaming agent or balloon-like filler 4 is formed on the surface of the molded metal plate 2 on the side of the internal combustion engine by a known method. It can be easily manufactured by forming by painting. Alternatively, a silicone rubber or silicone resin layer 3A containing a foaming agent or balloon-like filler 4 is applied to a metal plate 2 by a well-known method, and then formed by pressing or the like, and then the insulator 1 for an internal combustion engine. Manufacturing.

  According to this configuration, the surface of the metal plate 2 is provided with the layer 3A of silicone rubber or silicone resin containing the bubble or balloon-like filler 4 that improves the effect of shielding heat transfer by heat conduction. Since the heat radiation from the internal combustion engine can be blocked, the heat shielding effect by the internal combustion engine insulator 1A can be remarkably improved, and the thickness of the metal plate member 2 portion of the internal combustion engine insulator 1A can be reduced. Can be lighter. Further, when the silicone rubber or silicone resin layer 3A is provided on the side opposite to the internal combustion engine, the temperature of the silicone rubber or silicone resin layer 3A does not increase as compared with the case where the temperature is provided on the internal combustion engine side. Can be used until.

  And according to the structure of the insulators 1 and 1A for internal combustion engines of said 1st and 2nd embodiment, it was excellent in heat-shielding property with respect to the thermal radiation from the internal combustion engine in the metal plate material 2 excellent in heat resistance. Since the silicone rubber or silicone resin layers 3 and 3A are provided, it is possible to improve heat insulation and reduce the weight of the molded product in the insulators 1 and 1A for the internal combustion engine. Further, the resonance point can be removed by weight reduction, and the resonance due to vibration can be reduced.

  Moreover, according to said manufacturing method, the insulators 1 and 1A for internal combustion engines of said 1st and 2nd embodiment can be manufactured easily.

It is a fragmentary sectional view showing the insulator for internal-combustion engines of a 1st embodiment of the present invention. It is a fragmentary sectional view which shows the insulator for internal combustion engines of the 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,1A Insulator for internal combustion engines 2 Metal plate material 3 Silicone rubber or silicone resin layer 3A Silicone rubber or silicone resin layer containing bubbles or balloon-like filler 4 Bubbles or balloon-like filler

Claims (5)

  A metal internal combustion engine insulator covering a part or all of an internal combustion engine mounted on a vehicle, wherein an internal combustion engine is provided with a layer of silicone rubber or silicone resin on a surface of a metal plate constituting the internal combustion engine insulator. For insulators.   The insulator for an internal combustion engine according to claim 1, wherein the silicone rubber or silicone resin layer is provided on a surface of the metal plate opposite to the internal combustion engine.   The insulator for an internal combustion engine according to claim 1 or 2, wherein the silicone rubber or silicone resin layer contains a bubble or balloon-based filler.   The insulator for an internal combustion engine according to claim 1, 2 or 3, wherein the metal plate material is formed of an aluminum plate, an aluminum alloy plate, or an aluminum-plated steel plate.   5. The method of manufacturing an insulator for an internal combustion engine according to claim 1, wherein the insulator for an internal combustion engine according to claim 4 is manufactured by coating the metal plate material with silicone rubber or silicone paint.

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