JPS6228653Y2 - - Google Patents

Description

[Detailed explanation of the idea]

This invention relates to a vibration damping structure for an engine cover that is equipped with a restraining type damping material that has excellent heat resistance and has an excellent damping effect at high temperatures. This is what we provide. Conventionally, as a soundproofing measure for engine covers, there has been a method of coating the cover surface with a coating-type vibration damping material, and generally a two-component type of epoxy resin is often used. This type has problems with heat resistance, and also has disadvantages in terms of construction, such as requiring a lot of man-hours to finish it to a predetermined thickness and adding weight. Furthermore, the engine enclosure method implemented as a soundproofing measure for the engine body has been pointed out to have drawbacks such as an increase in temperature within the engine room, deterioration of cooling performance, and maintenance problems. The present invention was developed in order to eliminate these drawbacks, and is designed to reduce the radiated sound emitted from the engine cover, which is vibrated by the rotation of the engine when a car or construction vehicle is running. The purpose is to provide a mounting structure for vibration materials. Therefore, the present invention is characterized in that a laminate made by laminating a metal plate with a resin composition mainly composed of epoxy resin, brominated epoxy resin, and liquid acrylonitrile-butadiene copolymer is attached to the engine cover body. shall be. Hereinafter, the present invention will be described in detail based on embodiments of the present invention shown in the drawings. As shown in FIGS. 1 and 2, a laminate 2 is attached to the surface of the intake manifold 1 of the engine cover.
is installed. For attachment, either the resin composition side or the metal plate side of the laminate 2 may be brought into close contact with the front and/or back surfaces of the intake manifold 1 via a suitable adhesive. FIG. 3 is a side view showing another embodiment in which the laminate 2 is attached to the oil pan 3. The laminate 2 is made by laminating a resin composition mainly composed of an epoxy resin, a brominated epoxy resin, and a liquid acrylonitrile-butadiene copolymer on a metal plate. The resin composition may be in the form of being impregnated into a glass substrate such as a glass mat, if necessary. Further, the metal plate may be made of aluminum or the like, and is not particularly limited. This laminate 2 preferably has heat resistance and has a loss coefficient peaking around 120° C. in order to exhibit good vibration damping effects. FIG. 4 is a graph showing the vibration damping effect of the laminate 2. This graph is a graph showing the vibration damping effect of the laminate 2. This graph shows a sample of 0.5% of glass mat impregnated with the compound shown in Table 1 below between a 2 mm iron plate and a 1 mm restraint iron plate. mm resin composition as the intermediate layer

[Table] In this case, epoxy resin,
A self-adhesive intermediate layer consisting of brominated epoxy resin, liquid acrylonitrile butadiene copolymer, and their latent curing agent is used to control the thickness.
Impregnate glass mat of desired thickness. Generally, when the thickness of the vibrating member and the restraining plate are constant, the temperature characteristics change depending on the thickness of the intermediate layer. For example, in the case of this example in which the intermediate layer thickness is 0.5 mm, the thickness is
The thicker it is than 0.5mm, the peak temperature will be 120℃.
The lower the thickness is, and the thinner it is than 0.5mm, the higher the peak temperature will be than 120℃. When performing construction without a core like this, thickness control is greatly influenced by the temperature characteristics of vibration damping performance.
It's actually very difficult. For the above reasons, in this example, glass mat was used to control the thickness of 0.5 mm.
Non-woven fabric, mesh, etc. are not limited to glass mats, and if a combination of vibration member and restraint plate thickness is involved, or if the intermediate layer thickness is desired to be thick, ply-up of glass mats or the like may be considered. As is clear from the above, according to the present invention, as shown in Figs. As a result, the main body vibrates and the sound radiated from the cover has the effect of reducing the radiated sound by reducing the vibration of the main body. In addition, according to the present invention, by combining a vibration-damping intermediate layer with excellent heat resistance and vibration-damping effect at high temperatures and a metal restraint plate, a soundproofing effect can be obtained with less additional weight than before. .

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the laminate according to the present invention attached to the intake manifold cover, and FIG.
Fig. 1 is a partially enlarged sectional view taken along line A-A in Fig. 1, Fig. 3 is a side view of the laminate according to the present invention attached to an oil pan, and Fig. 4 is a vibration damping effect of the laminate according to the present invention. It is an explanatory diagram showing a graph. 1...Intake manifold, 2...Laminated body, 3...
…Oil pan.

Claims (1)

[Scope of utility model registration request] A vibration damping engine cover characterized in that a laminate made by laminating a resin composition mainly composed of epoxy resin, brominated epoxy resin, and liquid acrylonitrile-butadiene copolymer on a metal plate is attached to the engine cover body. structure.