JPH08254111A - Sound insulation device for automobile engine - Google Patents

Abstract

PURPOSE: To reduce noise emitted from an oil pan to the outside of a car by covering both right and left side faces of the deep bottom part of the oil pan with a noise insulating cover, and prevent degradation of engine oil by a simple configuration by allowing the oil pan to dissipate heat from the shallow bottom part in an open state. CONSTITUTION: In order to shut off noise generated from an oil pan 2 of an engine 1, which is provided with a shallow bottom part 2a and a deep bottom part 2b, the shallow bottom part 2a is kept in an open state, and a noise insulating cover 5 for covering at least the side faces of the deep bottom part 2b, on right and left sides of the car body, is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound insulation device for an automobile engine, which intercepts noise generated from an oil pan of the engine.

[0002]

2. Description of the Related Art Normally, in an automobile such as a truck, as shown in FIG. 10, a cross member 51 is provided between chassis (not shown) located below an engine 52 to support front wheels. The mounting positions of the cross member 51 and the engine 52 are substantially fixed, and the oil pan 53 arranged in the lower portion of the engine 52 is provided in order to secure the amount of engine oil to be accommodated.
Is formed in a shape having a shallow bottom portion 53a on one side and a deep bottom portion 53b on the other side.

The above oil pan 53 is the engine body 5.
Since the vibration No. 4 is transmitted, it is a factor of noise leaking to the outside of the automobile. Especially below the driver's seat, the engine 5
In the case of a vehicle having a configuration in which the two are arranged, the oil pan 53 is exposed on the side surface of the vehicle, so that the noise leakage to the side becomes remarkable, and recently, the noise leaking to the side is generated. It is necessary to take measures to keep the value within the predetermined environmental standard value. Therefore, conventionally, the sound insulation cover 55 formed so as to cover the entire oil pan 53.
Is attached to the engine body 54 to reduce noise leaking from the oil pan 53 to the outside of the vehicle.

[0004]

However, in the above-mentioned conventional structure, since the sound insulating cover 55 completely covers the oil pan 53, the heat dissipation of the oil pan 53 is insufficient and the engine oil is overheated. Deterioration will be accelerated. Therefore, it is necessary to provide a means for cooling the oil pan 53 inside the sound insulation cover 55, resulting in a complicated structure and an increase in cost.

An object of the present invention is to provide a sound insulation cover for an automobile engine which can reduce noise leaking from the oil pan 53 to the outside of the automobile and can sufficiently dissipate heat from the oil pan 53.

[0006]

In order to solve the above-mentioned problems, a sound insulation device for an automobile engine which intercepts noise generated from an oil pan of an engine having a shallow bottom portion and a deep bottom portion, and has the following features. ing. That is, the sound insulation device is characterized in that it has a sound insulation cover means for opening at least the shallow bottom and covering at least the left and right side surfaces of the deep bottom.

[0007]

According to the above construction, since the left and right side surfaces of the deep bottom, which account for most of the noise factors, are covered by the sound insulating cover means, it is possible to reduce the noise leaking from the oil pan to the outside of the automobile. In addition, since the oil pan can sufficiently dissipate heat from the open bottom, the deterioration of the engine oil can be prevented with a simple configuration.

[0008]

【Example】

[Embodiment 1] An embodiment of the present invention will be described with reference to FIGS. As shown in FIGS. 1 and 2, the sound insulation device of the present embodiment has sound insulation covers 5 and 5 that shield noise leaking from the oil pan 2 to the outside of the vehicle, and is provided below the driver's seat. It is provided in the lower part of the engine 1. The oil pan 2 is formed so as to avoid the cross member 3 located below the engine 1. Specifically, the oil pan 2 is a shallow member formed so that the bottom surface is located above the top surface of the cross member 3. It has a bottom portion 2a and a deep bottom portion 2b formed so that the bottom surface is located below the top surface of the cross member 3.

The oil pan 2 is fixed to the lower surface of the engine body 4. Further, sound insulating covers 5, 5 for blocking noise generated from the oil pan 2 are provided on both left and right side surfaces of the engine body 4, respectively. These sound insulation covers 5 and 5 are made of damping steel plates, and between the sound insulation covers 5 and 5 and the engine body 4,
A vibration absorbing member 10 such as a rubber plate is interposed. Thereby, the vibration transmitted from the engine body 4 is attenuated.

The sound insulation covers 5 and 5 are the oil pans 2.
The side view of the vehicle is formed in a rectangular shape so that both side surfaces of the deep bottom portion 2b on the left and right sides of the vehicle body are not exposed to the outside of the vehicle. On the other hand, as shown in FIG. 3, the shape of the sound insulation covers 5 and 5 viewed from the front of the vehicle is such that the upper end portion is fixed to the side surface of the engine body 4 and stands up along the side surface of the deep bottom portion 2b of the oil pan 2. After being lowered, it is bent so that the lower end portion is located below the bottom surface of the deep bottom portion 2b.

The operation of the sound insulation covers 5 and 5 having the above-mentioned structure will be described. When the engine 1 is started, the vibration of the engine body 4 is transmitted to the oil pan 2 and also transmitted to the sound insulating covers 5 and 5. At this time, since the vibration isolation member is interposed between the engine body 4 and the sound insulation covers 5 and 5, the transmission of vibrations from the engine body 4 to the sound insulation covers 5 and 5 is reduced. Become. Further, the vibration transmitted to the sound insulation covers 5 and 5 is absorbed by the vibration damping steel plate which is the material of the sound insulation covers 5 and 5. As a result, the vibration of the sound insulation covers 5, 5 transmitted from the engine body 4 becomes extremely small, and the sound insulation covers 5, 5 do not cause noise.

On the other hand, the vibration transmitted from the engine body 4 to the oil pan 2 vibrates the wall surface of the oil pan 2, and noise is generated from this wall surface.
At this time, most of the noise generated from the wall surface travels in the direction perpendicular to the wall surface. Therefore, the deep bottom 2b
Most of the noise generated from the left and right side surfaces of the vehicle body is blocked by the sound insulation covers 5 and 5, so that the amount of leakage to the side of the vehicle is reduced.

Further, the heat of the engine body 4 is changed by the oil pan 2
This heat is radiated from the bottom surface and front and rear surfaces of the shallow bottom portion 2a and the deep bottom portion 2b which are not covered with the sound insulating covers 5 and 5. As a result, the engine oil contained in the oil pan 2 will not be overheated due to the heat radiation of the oil pan 2, and deterioration will be prevented. In particular, in the case of the present embodiment, since the front side of the deep bottom portion 2b is open, heat dissipation is promoted by the air flow when the vehicle advances, and the cooling capacity becomes extremely high. There is.

Next, the following tests were conducted to confirm the sound insulation effect of the sound insulation covers 5 and 5 of this embodiment. That is,
First, when the engine 1 is operated at a predetermined rotation speed with the sound volume measuring device placed at a position 7.5 m away from the side of the vehicle and the sound insulation covers 5 and 5 are removed, the sound is emitted from the oil pan 2. The generated noise was separated and the sound pressure level (dB) was measured. Next, after the sound insulation covers 5 and 5 (side covers) of this example were attached, the sound pressure level (dB) when the engine 1 was operated under the same conditions as above was measured. Furthermore, a sound insulation cover (full cover) was attached so as to cover the entire oil pan 2, and the sound pressure level (dB) when the engine 1 was operated under the same conditions as above was measured. The results of these measurements are shown in Table 1.

[0015]

[Table 1]

From the above measurement results, the sound pressure level when the engine 1 is operated without the sound insulation cover (73.
6 dB), the sound pressure level (67.9 dB) when the sound insulation covers 5 and 5 (side covers) are attached and the sound pressure level (6) when the sound insulation cover (full cover) is attached.
7.7 dB) and respectively.
Sound insulation effects of 7 dB and 5.9 dB were obtained. From this, it was confirmed that the difference in the sound insulating effect between the sound insulating covers 5 and 5 of the present embodiment and the sound insulating cover (full cover) configured to completely cover the oil pan 2 was extremely small.

In the present embodiment, there is a gap between the side surface of the deep bottom portion 2b and the sound insulating cover 5, 5, and this gap prevents noise generated from the side surface of the deep bottom portion 2b of the oil pan 2. It is supposed to leak in the direction of the arrow and increase the noise to the outside of the vehicle. Therefore, as shown in FIG.
Leakage may be prevented by providing sealing members 6, 6 made of synthetic resin or the like between the bottom surface of the deep bottom portion 2b and the lower end portion of the oil pan 2. Further, as shown in FIG. 5, a sound absorbing material 7 made of glass wool or the like may be provided between the deep bottom portion 2b and the oil pan 2 to prevent leakage. Further, leakage may be prevented by bringing the whole or lower end of the sound insulation covers 5, 5 into close contact with the side surface of the oil pan 2.

Further, in the present embodiment, the two sound insulating covers 5, 5 cover both side surfaces of the deep bottom portion 2b, but it is formed so as to cover at least both side surfaces of the deep bottom portion 2b. However, it is not limited to this. That is, as shown in FIG. 6, it may be a rectangular sound insulation cover 9 having an opening 9a formed on the bottom surface, or as shown in FIGS. 7 and 8, the opening 9a is formed on the bottom surface. In addition, the front surface or the rear surface may be opened.

Further, in the present embodiment, as shown in FIG. 2, the sound insulating cover 5 is fixedly attached to the engine body 4, but the sound insulating cover 5 is not limited to this. That is, as shown in FIG. 9, for example, by fixing one end of the support member 8 to the front surface of the rectangular sound insulation cover 9 of FIG. 6 and fixing the other end of the support member 8 to the cross member 3. The sound insulation cover 9 may be attached.

As described above, in the sound insulation device of the present embodiment, the noise percentage of each surface of the oil pan 2 in the left-right direction (7.5 m point) of the vehicle body is 4% for the shallow bottom 2a and the bottom of the deep bottom 2b. 1%, 90% on both left and right sides of the deep bottom 2b, deep bottom 2
It is characterized by having the following configuration, paying attention to the fact that the front and rear surfaces of b are 5%.

That is, the sound insulation device includes a shallow bottom portion 2a and a deep bottom portion 2a.
b for blocking the noise generated from the oil pan of the engine, which has the shallow bottom portion 2a opened and covers at least the side surfaces of the deep bottom portion 2b on the left and right sides of the vehicle body (sound insulation covers 5.9 and 9b). The first feature is that it has).

As a result, since the left and right side surfaces of the deep bottom portion 2b having a noise percentage of 90% are covered by the sound insulation cover means (sound insulation covers 5.9), noise leaking from the oil pan 2 to the outside of the vehicle can be reduced. In addition to being possible, the heat can be sufficiently dissipated from the oil pan 2 from the shallow bottom portion 2a in the opened state, so that the deterioration of the engine oil can be prevented with a simple configuration.

A second feature of the sound insulation cover means is that the bottom surface is opened. As a result, the heat dissipation of the oil pan 2 is further promoted and the deterioration of the engine oil is prevented.

Further, in the above sound insulation cover means, one or both side surfaces of the front and rear sides of the vehicle body are opened.
It is a feature of. As a result, the oil pan 2 is forcibly cooled as the vehicle advances, and the heat dissipation of the oil pan 2 is further promoted, so that the deterioration of the engine oil is prevented.

A fourth feature is that a sound leakage prevention member (sealing member 6, sound absorbing material 7) is provided in the gap between the sound insulating cover means and the oil pan 2. As a result, the soundproof cover member and the oil pan 2 are provided by the sound leakage prevention member.
Since the noise leaking from between is blocked, the noise can be further reduced.

It is also preferable that the sound insulation cover means is fixed to the cross member 3 via the support member 8.
It is a feature of. As a result, the degree of freedom in mounting is increased, and the efficiency of vehicle body design can be improved.

A sixth feature is that the sound insulating cover means is attached to the engine body 4 of the engine 1 by being fixed via the vibration absorbing member 10. As a result, the vibration transmitted from the engine body 4 to the sound insulation cover means is reduced by the vibration absorbing member 10, so that the effect of preventing noise by the sound insulation cover means becomes more remarkable.

[0028]

As described above, according to the present invention, noise generated from an oil pan of an engine having a shallow bottom portion and a deep bottom portion is cut off, and the shallow bottom portion is opened, while at least the deep bottom portion is opened. This is a configuration having sound-insulating cover means for covering the left and right side surfaces of the vehicle body.

As a result, since the left and right side surfaces of the deep bottom, which accounts for most of the noise factor, are covered by the sound insulation cover means,
It is possible to reduce the noise that leaks from the oil pan to the outside of the car, and because the oil pan can fully dissipate heat from the shallow bottom that is in the open state,
It is possible to prevent deterioration of engine oil with a simple structure.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a state in which a sound insulation cover is attached.

FIG. 2 is an explanatory diagram showing a state in which a sound insulation cover is attached.

FIG. 3 is an explanatory diagram showing a state where noise leaks from a gap between a sound insulation cover and an oil pan.

FIG. 4 is an explanatory diagram showing a state in which a seal member is provided in a gap between the sound insulation cover and the oil pan.

FIG. 5 is an explanatory diagram showing a state in which a sound absorbing material is provided in a gap between the sound insulation cover and the oil pan.

FIG. 6 is a perspective view of a sound insulation cover and an oil pan.

FIG. 7 is a perspective view of a sound insulation cover and an oil pan.

FIG. 8 is a perspective view of a sound insulation cover and an oil pan.

FIG. 9 is an explanatory diagram showing a state where a sound insulation cover is attached.

FIG. 10 is an explanatory view showing a state where a sound insulation cover is attached.

[Explanation of symbols]

 1 Engine 2 Oil Pan 2a Shallow Bottom 2b Deep Bottom 3 Cross Member 4 Engine Body 5 Sound Insulation Cover 6 Seal Member 7 Sound Absorbing Material 8 Supporting Member 9 Sound Insulation Cover 10 Vibration Absorbing Member

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshio Inoue 1-5-5 Takatsukadai, Nishi-ku, Kobe-shi, Hyogo Prefecture Kobe Steel Co., Ltd.Kobe Research Institute (72) Inventor Ikuo Terada No. 8 Isuzu Motors Co., Ltd. Fujisawa Plant (72) Inventor Taketo Yaguchi No. 8 Tsutana, Fujisawa City, Kanagawa Prefecture Isuzu Motors Co., Ltd. Fujisawa Plant

Claims (6)

[Claims] 1. A sound insulation device for an automobile engine for cutting off noise generated from an oil pan of an engine having a shallow bottom portion and a deep bottom portion, wherein the shallow bottom portion is opened and at least the right and left vehicle bodies of the deep bottom portion. 1. A sound insulation device for an automobile engine, comprising sound insulation cover means for covering a side surface of the vehicle in close proximity. 2. The sound insulation device for an automobile engine according to claim 1, wherein the sound insulation cover means has a bottom opening. 3. The sound insulation device for an automobile engine according to claim 1, wherein the sound insulation cover means has one or both side surfaces open on the front and rear sides of the vehicle body. 4. A sound insulation device for an automobile engine according to claim 1, wherein a sound leakage prevention member is provided in a gap between the sound insulation cover means and the oil pan. 5. The sound insulation device for an automobile engine according to claim 1, wherein said sound insulation cover means is attached by being fixed to a cross member via a support member. 6. The sound insulation device for an automobile engine according to claim 1, wherein the sound insulation cover means is attached to the engine body of the engine by being fixed via a vibration absorbing member.