JPH11218023A - Engine cooling fan shroud for motor-bicycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of part items to easily manufacture a hollow- part, reduce labor and time of assembly, etc., and reduce the weight when the hollow part of sound insulation construction for an engine cooling fan shroud of motor-bicycle, etc., is formed. SOLUTION: When a sound insulation construction 4s is provided at a fan shroud 4 for covering the surroundings of a cooling fan 3 of an engine 1 for motor-bicycles, a hollow part H is formed by blow moulding during forming the fan shroud 4. The hollow part H is made as an air layer, or the inside of the hollow part is filled with a sound absorbing material such as foaming resin with high sound absorpbtion effect. At this time, a louver (a) can be formed integrally with an outside air inlet 4h, or an separate outside air inlet 4h can be installed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a fan cover for an engine cooling fan of a motorcycle or the like.

[0002]

2. Description of the Related Art Conventionally, for example, a cooling fan 52 is provided in an engine 51 of a motorcycle such as a scooter as shown in FIG.
The cooling fan 52 is covered with a fan cover 53. And this fan cover 5
3 has an outside air inlet 5 corresponding to the position of the cooling fan 52.
3h, a louver a is provided in the outside air inlet 53h, and a sound insulation structure 53s around the outside air inlet 53h for preventing transmission of noise generated from the engine 51 or noise generated from the cooling fan 52, and the like. Has been adopted.

In this sound insulation structure 53s, a hollow portion is formed by covering the outside of a fan cover main body 54 with a cover member 55, and the hollow portion is filled with a sound absorbing urethane sponge 56 and a plurality of cover members 55 are formed. Pop rivets 5
At 7, it is configured to be fixed to the fan cover main body 54.

[0004]

However, since the above-described sound insulation structure 53s forms a hollow portion for filling the urethane sponge 56, a plurality of the fan cover body 54, the cover material 55, the pop rivet 57 and the like are formed. In addition to the above-described components, it is necessary to manufacture each component separately, and the number of components is large, so that assembling is troublesome, and the weight tends to increase.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to reduce the number of parts in forming a sound insulation structure having a hollow portion, to enable easy manufacture, and to assemble. The aim is to reduce the labor and weight of the system.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a fan cover for an engine cooling of a motorcycle or the like, wherein a hollow portion for preventing transmission of noise is formed in at least a part of a cover layer. The part was formed by blow molding, and the inside was made an air layer or filled with a sound absorbing material.

As described above, when a parison (a tubular melt) such as a thermoplastic resin is introduced into a mold and the hollow portion is formed by blow molding in which gas is blown into the inside, the hollow portion is formed simultaneously with the cover molding. In addition, since it is a single component, labor and time for assembling can be omitted, and the weight can be reduced.

When the inside of the hollow portion is to be an air layer,
It is sufficient to simply blow-mold. When filling the sound-absorbing material, for example, an opening for filling or the like is provided and the sound-absorbing material is filled from there. Here, glass wool, rock wool, foamed resin material, or the like can be used as the sound absorbing material. When a foamed resin material or the like is used, for example, foamed beads may be filled and foamed inside.

The engine cooling fan cover for a motorcycle or the like preferably shields noise radiated from the engine, the cooling fan, or the like, and a component whose assembly procedure is desired to be simplified and reduced in weight. Therefore, it is preferable. At this time, the outside air introduction port and the louver required for the fan cover may be formed at the same time as the blow molding, or may be formed as separate parts.

[0010]

Embodiments of the present invention will be described with reference to the accompanying drawings. Here, FIG. 1 is a cross-sectional view showing a first configuration example of an engine cooling fan cover for a motorcycle according to the present invention, FIG. 2 is a process diagram showing an example of a manufacturing method for forming a louver of an outside air inlet, and FIG. FIG. 4 is a cross-sectional view showing a second configuration example of the engine cooling fan cover, and FIG. 4 is a perspective view of the engine cooling fan cover.

The engine cooling fan cover for a motorcycle according to the present invention can be made lighter without increasing the number of parts when constructing a sound insulation structure for shielding noise radiated from the engine or the cooling fan. ing.

That is, as shown in FIG.
A cooling fan 3 is attached to one end of the crankshaft 2 and a fan cover 4 is attached to the outside thereof.
An outside air inlet 4h is provided in a portion of the fan cover 4 corresponding to the position of the cooling fan 3, and a louver a having a lattice cross section as shown in FIG. 4 is provided in the outside air inlet 4h. Around the outside air inlet 4h, a fan cover is formed as a double layer, and
4s is provided.

Here, in the present invention, when the fan cover 4 is formed, the hollow portion H is formed by blow molding, and the entire fan cover 4 is formed of a single resin component.

That is, after the parison of the thermoplastic resin is sandwiched between a pair of molds, compressed air is introduced into the inside to inflate the parison into a cavity shape, thereby forming the sound insulation structure 4s.
And the formation of the outside air inlet 4h, as shown in FIG.
3B, the slide plate 11 provided on one side of the mold 10a is advanced toward the inside of the cavity as shown in FIG. The parison p adhered to the mold 10a on the side is pressed against the parison p of the mold 10b on the other side to adhere.

Next, as shown in FIG. 3 (c), if the slide plate 11 is moved backward, the space from which the slide plate 11 comes out is crushed by the action of the compressed air inside the parison p, and the space shown in FIG. As shown in (), a rib r is formed to connect the left and right parisons p. Then, cool the mold 10
After being taken out from a and 10b, as shown in FIG. 3 (e), if both sides are trimmed and cut off, the rib r becomes a louver a, and the trimmed cut-out portion becomes a through hole to form a portion of the outside air inlet 4h. Shape can be formed.

The fan cover 4 formed by the above-described method has a simple shape and a light weight because the hollow portion H is formed even though it is a single component.
In addition, since the hollow portion H can be formed simultaneously with the formation of the fan cover 4, it is simple. And such a fan cover 4
Is mounted around the cooling fan 3, the hollow portion H becomes an air layer, and a sound insulation effect can be achieved by viscous air of the hollow portion H and the like.

Incidentally, the hollow portion H formed as described above is used.
Alternatively, a sound absorbing material may be filled. Here, FIG.
Shows an example in which the foamed resin 5 is filled in the hollow portion H. In the present embodiment, for example, foamed beads are filled from a plurality of filling ports e, and the inside is heated and foamed, so that sound absorption is achieved. I try to enhance the nature. In FIG. 3, the same portions as those in the above-described example are denoted by the same reference numerals.

The sound absorbing material may be filled with a general sound absorbing material such as glass wool or rock wool. In this case, for example, the filling port e is made relatively large to fill the sound absorbing material. Afterwards, it is good to close it by an arbitrary method. Also in this case, the assembling work can be simplified, and the number of parts is small, so that the weight can be reduced.

The present invention is not limited to the above embodiment. Those having substantially the same configuration as those described in the claims of the present invention and exhibiting the same operation and effect belong to the technical scope of the present invention. For example, the outside air inlet 4h may be configured separately from the fan cover 4.

[0020]

As described above, in the engine cooling fan cover for a motorcycle or the like according to the present invention, the hollow portion is formed by blow molding when forming the hollow portion for preventing the transmission of noise in at least a part of the cover layer. To form
The hollow portion can be formed at the same time as the cover is formed, and since it is a single component, labor and time for assembling can be omitted, and the weight can be reduced. If the inside of the hollow portion is formed as an air layer or filled with a sound absorbing material, the sound insulating effect can be enhanced. Further, by applying the present invention to a fan cover of a vehicle engine cooling fan, the noise of the engine and the noise of the cooling fan are cut off, and the assembling procedure is simplified and reduced in weight.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a first configuration example of an engine cooling fan cover for a motorcycle or the like according to the present invention.

FIG. 2 is an explanatory view showing an example of a manufacturing method for forming a louver for an outside air inlet.

FIG. 3 is a cross-sectional view showing a second configuration example of a fan cover for engine cooling of a motorcycle or the like according to the present invention.

FIG. 4 is a perspective view of the engine cooling fan cover.

FIG. 5 is an explanatory diagram of a conventional engine cooling fan cover for a motorcycle.

[Explanation of symbols]

1 ... Engine, 3 ... Cooling fan, 4 ... Fan cover, 4
s: sound insulation structure, 5: foamed resin, H: hollow part.

Claims (1)

[Claims] 1. A cover in which a hollow portion for preventing transmission of noise is formed in at least a part of a cover layer, wherein the hollow portion is formed by blow molding, and the inside thereof is formed as an air layer. Alternatively, a fan cover for cooling an engine of a motorcycle or the like, which is filled with a sound absorbing material.