JP3402145B2 - In-vehicle engine intake noise processing device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intake sound processing device for processing intake sound of a vehicle-mounted engine.

[0002]

2. Description of the Related Art Conventionally, as an example of an intake sound processing apparatus for an on-vehicle engine of this type, an apparatus described in Japanese Utility Model Laid-Open No. 62-118735 is known. In this intake sound processing device, as shown in FIG. 6, the intake pipe 50 includes the outer panel 5
1 and a body panel 57, and an opening is formed in a fender internal space 55. And this intake pipe 50 is
It penetrates through the body panel 57 and is connected to the engine 53. Therefore, the outside air taken in through the intake pipe opening 50a penetrates the body panel 57 and the engine 53.
Will be introduced in.

[0003]

By the way, in the above-described intake sound processing apparatus, the sound generated by the engine 53 with the operation of the engine 53 is transmitted from the intake pipe 50 to the intake pipe opening 50a. It will be generated as a sound. When the natural frequency of the fender inner space 55 matches the frequency of the sound generated by the engine 53, resonance occurs and the intake sound is increased. In particular, when the frequency at which the resonance occurs is in the low frequency region side, it is heard as an unpleasant sound that presses the ear.

The present invention has been made in view of the above circumstances, and an object thereof is to make an opening of a covering member provided in an inner space of a fender larger than an outer diameter of an intake pipe penetrating the opening. Accordingly, it is an object of the present invention to provide an intake sound processing device for a vehicle-mounted engine, which can reduce the intake sound in the low frequency region, which is heard as an unpleasant sound that presses the ear.

[0005]

In order to achieve the above object, the invention according to claim 1 has a body panel provided with a first through hole, an outer panel provided with a second through hole, and The first and second through holes are covered, and the first and second through holes are provided.
A cover member that connects between the through holes in a tunnel shape, and an opening provided in the connecting portion of the cover member, and an intake pipe extending from the engine room penetrates the first through hole to cover the cover member. It extends inside the installation member and further penetrates through the opening to open in a space inside the fender formed between the body panel and the outer panel, and the opening is larger than the outer diameter of the intake pipe. The purpose is to provide a gap between them.

According to this structure, since the covering member having the opening larger than the outer diameter of the intake pipe is provided, the intake sound reaches the inside of the covering member, and the sound pressure is released from the opening. The muffled sound can be lowered. Therefore, it is possible to reduce the inhalation sound on the low frequency region side, which is heard as an unpleasant sound that presses the ear.

According to a second aspect of the present invention, in the intake sound processing apparatus for a vehicle-mounted engine according to the first aspect, the intake pipe and the lower peripheral edge of the opening are in contact with each other, and a plurality of cuts are provided in the lower peripheral edge. This is the summary.

According to this structure, the opening can be allowed to expand, and the assembly can be easily performed.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment in which the present invention is embodied in a midship engine type passenger car will be described below with reference to FIGS.

As shown in FIG. 1, the engine 1 has four cylinders and is mounted in the engine room R in the vicinity of the rear wheel portion 2a of the vehicle body 2 and in the front portion of the rear wheel portion 2a. The outside air introduced from the air intake port 3 provided at the lower rear portion of the side surface of the vehicle body 2 is introduced into the engine 1 from the intake pipe 4 in a manner described later.

As shown in FIG. 2, the rear side of the vehicle body 2 is composed of a body panel 11, an outer panel 12 and an air intake panel 13. Then, by attaching the outer panel 12 to the body panel 11, an inner space of the fender is formed between the panels 11 and 12.

The body panel 11 is provided with a substantially triangular first through hole 11a. Further, the outer panel 12 is provided with a substantially rectangular second through hole 12a. A covering member 15 is attached between the body panel 11 and the outer panel 12 so as to connect the first and second through holes 11a and 12a in a tunnel shape. The first through hole 1 is provided at one end (left side) of the covering member 15.
A substantially triangular retaining ring 15a is attached to match the shape of 1a, and the other end (right side) of the retaining ring 15a has a substantially square shape according to the shape of the second through hole 12a.
b is attached. And both stop rings 15a,
A rubber-shaped connecting portion 15c connects between 15b in a tunnel shape. The stop rings 15a and 15b are attached to the positions of the first and second through holes 11a and 12a, respectively, so that the through holes 11a and 12a are connected to each other.

The air suction panel 13 is provided with the second
Is attached to the outer panel 12 so as to cover the through hole 12a. The air intake panel 13 has a second through hole 12
The air intake port 3 is provided in accordance with the position of a. Therefore, the air outside the outer panel 12 communicates with the inside of the body panel 11 (inside the engine room R) through the air inlet 3, the second through hole 12a, the covering member 15, and the first through hole 11a.

Incidentally, as shown in FIG. 3, the covering member 1 is provided.
An opening 16 is provided in the connecting portion 15c of No. 5. The intake pipe 4 penetrates the stop ring 15a (first through hole 11a) and is inverted and curved in an arc shape inside the covering member 15, and further penetrates through the opening 16 to project outside the covering member and open. ing.

The intake sound processing device having the above-mentioned structure will be described in more detail with reference to FIG. Here, FIG.
FIG. 4A is a partial cross-sectional view of the same device seen from the front side, and FIG.
4B is a partial cross-sectional view taken along the line BB of FIG.

As shown in FIG. 4, an outer panel 12 is arranged outside the body panel 11, and both outer panels 11 and
The space S inside the fender is formed between the spaces 12.
On the other hand, the inside of the body panel 11 forms an engine room R. The air intake panel 13 is attached to the lower portion of the outer panel 12.

A cover member 15 is provided between the body panel 11 and the outer panel 12, and each stop ring 1 is provided.
5a and 15b are the first and second through holes 11a and 1 respectively.
It is fixed by a pin 17 according to the position of 2a.

As described above, the cover member 15 is provided with the opening 16. And engine room R
The intake pipe 4 extending from the inside penetrates the first through hole 11a and is inverted and curved in an arc shape inside the covering member 15, and further the opening 16 is formed.
Through and penetrates into the space S inside the fender to open.

The opening 16 is larger than the outer diameter of the intake pipe 4, and a gap is formed between the upper part of the intake pipe 4 and the upper part of the opening 16. Therefore, the space S in the fender and the inside of the covering member 15 communicate with each other.

The lower part of the peripheral edge of the opening 16 is in contact with the intake pipe 4, and a plurality of cuts 8 are formed in the lower part thereof. These are provided to allow the opening 16 to expand during assembly.

By the way, as described above, the natural frequency exists in the space S inside the fender. Therefore,
When the frequency of the sound generated by the engine 1 (FIG. 1) matches the natural frequency, resonance occurs and the intake sound is increased. In this case, when the frequency at which the resonance occurs is in the low frequency region side, it is heard as an unpleasant sound that presses the ear. In the present embodiment, since the connecting portion 15c of the covering member 15 is provided with the opening 16 larger than the outer diameter of the intake pipe 4, the natural frequency is improved as shown in FIG.

The change in the sound pressure level (noise) characteristic of the intake sound between when the opening 16 of the present embodiment is provided and when it is not provided will be described below with reference to FIG. In each of the above cases, FIG. 5 is a graph showing the results measured in the driver's seat of the vehicle when the engine speed is increased by fully opening the throttle valve from the stopped state of the vehicle. Shows the relationship with the sound pressure level of.
In addition, the case where the opening 16 is not provided indicates a configuration in which the size of the opening 16 is equal to the outer diameter of the intake pipe 4.
Here, the relationship between the engine speed and the frequency of sound generated due to the explosion of the engine is expressed by f = N [rpm] ÷ 60 [sec / min] × (4 times / 2 rotations) [Hz] To be done. Here, f is the vibration frequency of sound generated due to the explosion of the engine, and N is the engine speed. Also,
In the case of a 4-cylinder engine, (4 times / 2 rotations) is 4 times every 2 rotations of the crankshaft that is the output shaft of the engine.
This is a multiplier by shifting to the combustion stroke. That is, the sound generated due to the explosion of the engine has a cycle corresponding to the combustion timing of the engine, and therefore is converted by the multiplier.

In FIG. 5, the solid line shows the case where the opening 16 of the present embodiment is provided and the case where the broken line is not provided. As shown in FIG. 5, by providing the opening 16, sound pressure can be released from the opening 16 to reduce the muffled sound. Therefore, as compared with the case where the opening 16 is not provided, the sound pressure level characteristic as a whole shifts to the higher rotation frequency side of the engine, that is, the higher frequency region side vibration frequency. Therefore, by providing the opening 16,
The sound pressure level (noise) of the intake sound at 3600 to 4200 rpm, which is the engine speed corresponding to the frequency on the relatively low frequency region side, is reduced. That is, as determined from the above calculation formula, the sound pressure level of the sound with the frequency of 120 to 140 Hz generated corresponding to the engine speed is reduced. Therefore, noise belonging to the frequency range, which is heard as an unpleasant sound that presses the ear, is reduced.

As described in detail above, according to this embodiment, the following effects can be obtained. -It is possible to reduce the noise that belongs to the frequency range and is heard as an unpleasant sound that presses the ear.

By providing a plurality of notches 8 on the lower peripheral edge of the opening 16 that is in contact with the intake pipe 4, the opening 16 can be expanded during assembly. Therefore, the assembly can be easily performed.

The present embodiment is not limited to the above, but may be modified as follows. In the present embodiment, the connecting portion 15 of the covering member 15
Although c is made of rubber, any other material such as synthetic resin may be used.

In the present embodiment, the intake pipe 4 is opened in the fender internal space S formed on the rear side surface of the vehicle body 2, but it is opened in the fender internal space formed at other positions. Good.

In the present embodiment, the midship engine in which the engine 1 is mounted in the front part rather than the rear wheel part 2a is taken as an example, but this may be, for example, a front engine or a rear engine.

In the present embodiment, the 4-cylinder engine is adopted, but other types of engines may be adopted.

[0030]

According to the invention as set forth in claim 1, since the cover member having the opening larger than the outer diameter of the intake pipe is provided, the intake sound reaches the inside of the cover member, and the same opening is provided. You can reduce the muffled sound by removing the sound pressure from the section. Therefore, it is possible to reduce the inhalation sound on the low frequency region side, which is heard as an unpleasant sound that presses the ear.

According to the second aspect of the present invention, it is possible to allow the opening to expand and to easily assemble it.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a mounting mode of an engine to which an intake sound processing device according to the present invention is applied.

FIG. 2 is a perspective view showing an assembling mode of the intake sound processing device according to the present invention.

FIG. 3 is a perspective view showing the structure of a covering member.

FIG. 4 is a partial cross-sectional view showing a front surface and a planar structure of an embodiment of the intake sound processing device according to the present invention.

FIG. 5 is a graph showing the relationship between engine speed and sound pressure level.

FIG. 6 is a schematic diagram showing a conventional intake sound processing device.

[Explanation of symbols]

4 ... Intake pipe, 11 ... Body panel, 11a ... 1st penetration hole, 12 ... Outer panel, 12a ... 2nd penetration hole, 15 ...
Covering members, 15a, 15b ... Pressing ring, 16 ... Opening, 17 ... Pin, S ... Fender inner space, R ... Engine room.

Claims (2)

(57) [Claims] 1. A body panel provided with a first through hole, an outer panel provided with a second through hole, and a space between the first and second through holes that covers the first and second through holes. A covering member that connects the above in a tunnel shape, and an opening provided in the connecting portion of the covering member, and an intake pipe extending from the engine compartment penetrates through the first through hole and the inside of the covering member. And further penetrates through the opening and opens into a space inside the fender formed between the body panel and the outer panel, the opening being larger than the outer diameter of the intake pipe. Intake sound processing device for vehicle-mounted engine with a gap between them. 2. The intake pipe and the lower peripheral edge of the opening are in contact with each other, and a plurality of cuts are provided in the lower peripheral edge.
The intake sound processing device for the vehicle-mounted engine described.