JPS5939140Y2 - Soundproof cover for engine - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a soundproof cover for an engine used in automobiles, etc., which prevents engine noise, particularly noise from a cooling fan.

Generally, as shown in FIG. 1, an engine 2 has a transmission 1 at its rear, a cooling fan 3 at its front, and a radiator 5 having a shroud 4 mounted in front of the fan 3.

On the other hand, engine noise mainly comes from vibrations of the engine body 2 and from the cooling fan 3.

Among these, the noise caused by the cooling fan 3 occupies a large portion.

The cause of this is that the fan 3 blows the air, the air collides with the engine body 2, or the air diffuses, causing air turbulence.

Therefore, in order to prevent the above-mentioned noise from being transmitted to the outside, conventionally, all or most of the engine body 2 is attached to the bracket 10 as shown in FIGS. 2 and 3. It was covered with a soundproof cover 6 with good elastic support.

However, with such a structure, even if noise from the engine body 2 can be blocked, the heat dissipation performance of the engine body 2 deteriorates.

Therefore, the radiator 5 must be cooled more strongly.

However, if an attempt is made to increase the air volume by increasing the rotational speed of the cooling fan 3, the noise of the cooling fan 3 becomes extremely large as shown in FIG.

Alternatively, it is necessary to increase the size of the cooling fan 3 in order to perform cooling without increasing the rotation speed.

The housing and soundproof cover 6 must have a structure that has good heat dissipation or a structure that reduces noise in the air population 6a, which has the disadvantage of increasing cost and weight.

SUMMARY OF THE INVENTION In view of the above-mentioned conventional drawbacks, the present invention aims to provide a soundproof cover for an engine that can easily reduce engine noise at low cost.

Hereinafter, the present invention will be explained in detail with reference to an embodiment shown in FIGS. 5 and 6.

In the description of the embodiment of the present invention shown in FIGS. 5 and 6, parts that are considered to have the same or equivalent structure as the embodiment shown in FIG. The explanation will be omitted.

The main difference between the embodiments shown in FIGS. 5, 6, and 7 from the embodiment shown in FIG. 1 is that the engine A is equipped with a defense cover 6A. a shroud portion 7 whose front surface is attached to the radiator 5 and covers the cooling fan 31 from the radiator 5;
The cover part 8 is integrally provided at the rear end and covers the lower side of the engine main body 2, and the cover part 8 is elastically supported on the vehicle body (not shown) via a bracket 9.

Note that a sound absorbing material may be attached to the shroud portion 7 and the cover portion 8.

In addition, the shroud part 7 and the cover part 8 may be formed separately, and both may be fixed with screws, or the two may be wrapped to fill the gap with a sound absorbing material, or an elastic material such as a cloth-filled rubber band may be used between the two. It may be directly connected.

In the above configuration, the cooling fan 3 is connected to the engine body 2.
The air sucked in from the front of the radiator 5 passes through the shroud part 7 and is forced to flow along the engine body 2.

This reduces airflow diffusion, reduces noise, and increases the cooling effect.

Therefore, since the rotation speed of the cooling fan 3 can be slowed down,
Noise from the cooling fan 3 can also be reduced.

Further, since the radiator 5 covers the lower side of the engine body 2, noise radiated from below is blocked, and the upper side and side portions of the engine body 2 can be sound-insulated by the vehicle body in the engine room.

As is clear from the above description, the present invention includes a shroud part that covers the cooling fan 1 from the radiator, and a shroud part that is provided at the rear end of the shroud part to open the upper side of the engine body and to open the lower and side parts of the engine body. A soundproof cover is formed with a part of the cover that covers the engine, so compared to conventional ones that cover the engine body,
It has the advantage of being lightweight, low cost, and can significantly reduce noise.

Furthermore, since the upper part of the engine body is not covered with a soundproof cover during engine repair or inspection, there are excellent practical advantages such as work efficiency is not impaired.

Furthermore, since the part of the cover is elastically supported by the vehicle body through the bracket, engine vibrations transmitted to the part of the cover can be blocked and noise emitted from this part of the cover can be prevented. play.

[Brief explanation of the drawing]

Fig. 1 is a side view showing the engine, Figs. 2 and 3 are a side view and a plan view of the engine with a conventional soundproof cover,
Figure 4 is a graph showing the relationship between fan rotation speed and noise level, Figures 5 and 6 are side and plan views of the engine incorporating the present invention, and Figure 7 is a perspective view of the invention. . 1...Transmission, 2...Engine body,
3... Cooling fan, 4... Shroud, 5... Radiator, 6, 6A... Soundproof cover, 7... Shroud portion, 8... Part of cover, 9... Bracket.

Claims (3)

[Scope of utility model registration request] (1) In a vehicle engine in which a cooling fan and a radiator are installed in front of the engine body, a shroud portion whose front end is attached to the radiator and covers the cooling fan 1 from the radiator, and a shroud portion provided at the rear end of the shroud portion A soundproof cover for an engine, which is made up of a cover that opens the upper side of the engine body, covers the lower side and side parts, and is elastically supported by the vehicle body via a bracket. (2) The soundproof cover for an engine according to claim 1, wherein the shroud part and a part of the cover are integrally formed. (3) The soundproof cover for an engine according to claim 1, which is a registered utility model, characterized in that the shroud part and part of the cover are formed separately and are attached so that there is no gap between them.