JPH0327885Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an engine cover that prevents noise leakage from an automobile engine or transmission.

[Conventional technology and its problems]

Although such an engine cover is not normally provided in most cases, in recent years, as regulations on noise pollution from automobiles have become stricter, and because it has the effect of lowering the air resistance of the car body from the underside of the car body, consideration has been given to installing one.

The engine covers that are now on the market are single-piece products made of metal plates such as steel or aluminum plates, or synthetic resin plates mixed with glass, and are more focused on reducing air resistance. In terms of soundproofing, some have sound-absorbing materials such as glass wool, felt, or urethane foam attached to their inner surfaces, but these sound-absorbing materials are highly susceptible to dirt from muddy water and dust, and their sound-absorbing performance decreases when water is added. Put it away.

Therefore, as shown in Utility Model Application Publication No. 57-71729, an engine cover with low water absorption and good weather resistance was proposed, which had a double wall structure and the interior was divided into many cells by honeycomb-like partition plates. ing.

This is constructed by overlapping two separate plates, an inner board and an outer board, made of polypropylene, and the internal partition plate is made of a different material such as aluminum foil. It has a large number of parts, requires a complicated assembly process, and
The flatter the whole, the more troublesome and difficult it is to assemble.

The purpose of the present invention is to eliminate the disadvantages of the conventional example,
It is lightweight, has excellent weather resistance, and is flat and easy to use.
Moreover, it is an object of the present invention to provide an engine cover for an automobile that has a high soundproofing effect, can be manufactured at a simple manufacturing process, and at low cost.

[Means for solving problems]

In order to achieve the above object, the present invention consists of a synthetic resin consisting of a horizontal flange part, an inclined wall part extending downward from the flange part while narrowing the distance between them, and a horizontal bottom plate part connecting the lower ends of the inclined wall part. It is a hollow plate made by blow molding.The upper face plate of the hollow plate has many small holes for sound absorption, and the lower face plate has ribs with grooves that protrude inward. The gist is that the ribs are joined to the upper face plate and the internal space is appropriately partitioned by the ribs.

[Effect]

According to this invention, the material is only a single synthetic resin, and since it is hollow, it is lightweight, and all parts, including the partition members, are continuous and can be molded all at once by blow molding, reducing the number of steps. The least amount is fine.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 2 is a perspective view of the engine cover of the present invention, FIG. 1 is a sectional view taken along the line A--A in FIG. 2, and FIG. 3 is a perspective view showing the engine cover installed in an automobile.

First, to explain the overall shape, horizontal flanges 1, 1 are provided on the left and right sides to be fastened to the lower surface of an automobile frame (not shown), and inclined walls 2, 2 that fall down from these while narrowing the distance between them. The tips are connected by a horizontal bottom plate 3, and the top surface is open and the front and back ends are sealed, or the front and back ends are open and closed with a separate material. FIG. 3 shows the state in which this is installed. In the figure, 9 is the lower surface of the vehicle body, 10 is an undercover, and 11 is a front bumper.

As shown in FIG. 1, the horizontal flange 1, inclined wall 2, and bottom plate 3 are all continuous hollow plates made of synthetic resin and blow-molded. In order to reduce the weight of the molded product, the synthetic resin material is polypropylene (P.
P) or high density polyethylene (HDPE) around 0.95
Alternatively, a material (specific gravity 0.95 to 1.2) mixed with reinforcing filler is used. In some cases, these materials may be foamed to further reduce their specific gravity. This is considerably lighter than the aluminum one (specific gravity 2.7).

In addition, when performing blow molding, the lower face plates 2a and 3a of the inclined wall 2 and the bottom plate 3 are made to protrude inward to form a concave groove by the rib 4 by the rib stand,
In this way, the hollow interior is appropriately partitioned into cells of a predetermined size. The size of the space partitioned by the ribs 4 is determined by taking into account the resonance state depending on the frequency of the noise generated by the engine, and the ribs 4 are also used for reinforcement, so the first As shown in the figure, the tips are joined to the back surfaces of the other face plates 2b and 3b to completely partition them.

On the other hand, bolt insertion holes 5 are provided in the horizontal flanges 1, 1.
However, the upper face plate 2b on which the rib 4 is not formed,
A large number of small holes 6 for sound absorption are formed in each of the holes 2b, and a through hole 7 for drain removal is formed in the bottom plate 3.

FIG. 4 shows a portion of the bolt insertion hole 5, in which a rib stand with a circular groove protruding inward is formed in the face plate 1a on the lower side of the flange 1, and its tip end is joined to the other face plate 1b. The bolt insertion hole 5 is formed by punching and forming this joint portion using a drill or a drill.

On the other hand, the small hole 6 is obtained by integrally molding a circular trapezoidal projection 8 during blow molding and cutting off the head thereof, as shown in FIG. In this way, the small hole 6 has an embossed rib structure with a slightly raised peripheral edge, which improves strength and prevents drainage water from entering.

The through hole 7 for drain removal provided in the bottom plate 3 is made by combining the method of making the bolt insertion hole 5 with the method of making the small hole 6.The upper face plate 3b is ribbed with a circular groove, and its tip is drilled or cut. The corresponding lower face plate 3a is punched out using a drill, and a hole is formed by cutting out the upper part of the circular trapezoidal projection bulging outward. In this way, the through hole 7 penetrates from the top to the bottom of the bottom plate 3 and at the same time communicates with the hollow part inside the bottom plate 3 so that the drain water that has entered the hollow part through the small hole 6 etc. It can be removed from the through hole 7.

[Effect of idea]

As mentioned above, the automobile engine cover of the present invention is made of synthetic resin and is hollow, so
It is lightweight, has excellent weather resistance, and does not attract much dirt.

In addition, since the hollow interior is appropriately partitioned, it has a high soundproofing effect, and the mold cost is low.Blow molding allows for molding including the partition members in one piece, so the number of parts and manufacturing steps are reduced, making it possible to create a flat and easy-to-use product. It can be obtained easily and inexpensively.

[Brief explanation of the drawing]

1 is a sectional view taken along the line A-A in FIG. 2, FIG. 2 is a perspective view showing one embodiment of the automobile engine cover of the present invention, FIG. The figure is a cross-sectional view of the main part of the flange part.
The figure is a sectional view of the main part of the bottom plate part, and FIG. 6 is a longitudinal sectional front view showing one of the manufacturing steps. 1...Horizontal flange, 1a, 1b, 2a, 2
b, 3a, 3b... face plate, 2... inclined wall, 3...
Bottom plate, 4...rib, 5...bolt insertion hole, 6...
Small hole, 7...Through hole, 8...Protrusion, 9...Bottom surface of vehicle body, 10...Under cover, 11...Front bumper.

Claims (1)

[Scope of utility model registration request] It is a hollow plate made of synthetic resin and blow-molded, which consists of a horizontal flange, an inclined wall extending downward from the flange at a narrowing distance, and a horizontal bottom plate connecting the lower ends of the inclined wall. A large number of sound-absorbing small holes are formed in the upper face plate of the hollow plate, and a rib stand with a concave groove that protrudes inward is formed in the lower face plate, and this rib is joined to the upper face plate. An automobile engine cover that is characterized by appropriately partitioning the interior space.