KR0145464B1 - Engine room enclosure - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to automobiles, and more particularly, to an engine room enclosure in which less noise generated from an engine, transmission, and the like is emitted to the outside. Conventionally, a single-layered metal material is used to suppress the emission of noise such as an engine. The engine room enclosure of the present invention has a composite sandwich structure. That is, there is a filler layer inside the soundproof effect is excellent and can be made using a lighter material than the metal material. The engine room enclosure of the present invention is used as a sound insulation of automobiles.

Description

Multi-layered engine room enclosure

1 is a side view of a truck for explaining the installation position of the engine room enclosure, Figure 2 is a view showing an example of a conventional engine room enclosure, Figure 3 is a view showing the engine room enclosure according to the present invention.

* Explanation of symbols for main parts of the drawings

100: engine room enclosure 110: plate body

111: flat plate portion 112: side plate portion

113: vertical plate portion 114: receiving space

120: filler

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to automobiles, and more particularly, to an engine room enclosure that allows less noise emitted from engines, transmissions, etc. to be emitted outside.

In general, not only a lot of noise is generated in a commercial vehicle such as a truck, but also a lot of generated noise is emitted to the outside. As a result, noise regulations on commercial vehicles are increasing. In response to this, the importance of technology for suppressing the emission of noise generated from an engine or a transmission to the outside is increasing.

In order to suppress the emission of noise from the engine and the transmission, a cover surrounding the engine and the transmission, i.e., an engine room enclosure of a predetermined shape is used. Since the engine room enclosure may be used as a scaffold for an operator when repairing an engine, the engine room enclosure should have a certain bending strength or more.

1 is a side view of a truck for explaining the installation position of the engine room enclosure. 1, a truck cap 11, a cargo container 12, a wheel 13, a chassis 14, and the like are shown. The engine room enclosure 20 is usually installed just behind the truck cap 11 as shown in FIG. There is an engine (not shown) below the truck cap 11 in front of the engine room enclosure 20 and a transmission (not shown) below the engine room enclosure 20.

The conventional engine room enclosure 20 in FIG. 2 consists of a transmission cover 23 covering the top of the transmission and an engine rear cover 24 covering the upper back of the engine. This transmission cover 20 is provided with the flat plate part 23a which blocks the upper part of a transmission, and the side plate part 23b which blocks both sides. As can be seen from FIG. 2 (b), both the flat plate portion 23a and the side plate portion 23b of the transmission cover 23 have a single layer structure and are generally made of a metal material. The engine rear cover 24 also has a single layer structure as shown in FIG. 2 (c) and is made of a metallic material.

That is, in the related art, a single-layered metal plate was used as the transmission cover 23 covering the upper portion of the transmission and the engine rear cover 24 blocking the upper back of the engine. Engine chamber enclosure 20 made of such a conventional metal has the disadvantage of increasing the overall weight of the vehicle, difficult to process into a complex shape. In addition, there is a disadvantage that corrosion is good.

It is an object of the present invention to provide an engine room enclosure that is light and has excellent noise emission suppression function and is easy to make into a complicated shape. The object of the present invention is installed in the engine and the transmission of the vehicle in the engine room enclosure for reducing the noise emitted from the engine and the transmission to the outside, to cover the engine rear and the transmission top and side It can be achieved by an engine room enclosure, which is formed into a shape, formed of a composite material composed of a resin and a reinforcing material, and includes a plate body having an accommodation space therein and a filler filled in the accommodation space.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention. 3 is a view showing an engine room enclosure according to the present invention. Fig. 3 (a) shows the whole view, Fig. 3 (b) is a sectional view taken along the third (a) diagram C-C, and Fig. 3 (c) is a sectional view taken along the third diagram (a) D-D.

3 is composed of a filler 120 filled in the receiving space 114 inside the plate body 110 composed of a flat plate 111, both side plates 112 and the vertical plate 113. have. The flat plate portion 111 and the side plate portion 112 are intended to suppress noise from being emitted to both sides and upwards by surrounding the transmission. The vertical plate portion 113 is for suppressing the emission of noise to the upper rear of the engine. Of course, the flat plate portion 111, the vertical plate portion 113, both side plate portion 112 may be changed according to the characteristics of the place to sound insulation.

As the plate body 110, a composite material molded from a fiber reinforcement material and a resin may be used. Fiber reinforcing materials used herein include glass fibers, carbon fibers, aramide fibers, kevlar fibers, and the like. What is necessary is just to use unsaturated ester resin, an epoxy resin, a vinyl ester resin, etc. as resin.

Filler 120 may be used, such as polyurethane foam (polyurethane foam), PVC foam, wood, paper aluminum honeycomb. As can be seen from FIGS. 3 (b) and 3 (c), the cross section of the flat plate portion 111 and the vertical plate portion 113 has a multilayer structure. That is, the flat plate portion 111 and the vertical plate portion 113 is composed of two skin layers on both sides of the composite material and a filler 120 layer therebetween. Such a composition is called a sandwich structure as a composite, and a filler is usually called a foam core.

In this structure, the composite material of both skin layers having light weight and high specific rigidity and specific strength is inferior in sound insulation properties to prevent the transmission of sound fields generated from noise sources. This can be seen from the fact that a material having a large surface density (density per unit area) of the material is excellent in sound insulation properties, as known in the mass law, which is a law for calculating sound insulation properties. That is, a composite material having a lower surface density than steel has a lower sound insulating property than steel.

However, as shown in Fig. 3 (b) and Fig. 3 (c), when the multilayer structure having the filler 120 is formed, the sound insulation characteristics are very good without being affected by the mass furnace. This is because the filler 120 attenuates the sound pressure applied to one epidermal layer and then transfers it to the opposite epidermal layer.

Box-shaped specimens were fabricated and tested to investigate the sound insulation characteristics of these sandwich structures. The test specimens were made of the same steel specimens and composite specimens based on the bending stiffness, which is the design standard for general covers. At this time, a composite sandwich structure in which a core material, that is, a filler, was inserted between specimens made of a composite end plate was also produced. Composite materials were made of glass fiber and unsaturated polyester, and polyurethane foam was used as core material. As a result of the test, it was found that the sound insulation characteristics of the composite end plates were lower than those of the steel having the same bending stiffness, but the composite sandwich structures having the foam cores interposed between the composite end plates showed better sound insulation characteristics than the steel.

As the composite sandwich structure, the rear engine cover and the transmission cover of a commercial vehicle are manufactured, the cross-sectional coefficient is increased and the bending rigidity is increased. In addition, it is lighter than the one made of metal material such as steel, and has excellent sound insulation effect. Using the composite sandwich structure can improve the sound insulation effect of commercial vehicles, passenger cars, heavy equipment, and the like.

The engine room enclosure according to the present invention as described above is light and excellent in sound insulation characteristics. In addition, there is an advantage that molding of curved portions and complex shapes is advantageous. In addition, since the part contacting the outside air is a composite material, there is also an advantage of excellent corrosion resistance.

Claims (4)

An engine room enclosure installed near an engine and a transmission of an automobile to reduce noise emitted from the engine and the transmission to the outside, wherein the engine room enclosure is molded into a shape covering the engine rear part and the transmission upper part and the side part. A plate body formed of a composite material made of a reinforcing material and having an accommodation space therein; And a filler filled in the accommodation space. The engine room enclosure according to claim 1, wherein at least one of glass fiber, carbon fiber, aramide fiber and kevlar fiber is used as the reinforcing material. The engine room enclosure according to claim 1, wherein at least one of an unsaturated polyester resin, an epoxy resin, and a vinyl ester resin is used as the resin. The engine room enclosure according to claim 1, wherein at least one of polyurethane foam, PVC foam, wood, paper, and aluminum honeycomb is used as the neutral material.