JP4110617B2 - Engine intake system layout - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an engine intake system arrangement structure, and more particularly to an intake duct arrangement structure provided with an intake resonator.
[0002]
[Prior art]
Conventionally, as an arrangement structure of this type of engine intake system, an arrangement in which an intake duct communicating with an air cleaner is disposed at the front side position of the wheel house on the right front side of the vehicle body is known (for example, JP-A-5-1634). reference). In this device, a U-shaped intake duct is disposed at the front side position of the wheel house, and a resonance type silencer formed in an L shape from the outside of the vehicle body to the front side of the lower portion of the intake duct. As a first intake resonator, and a second intake resonator on the inside of the vehicle body above the intake duct.
[0003]
[Problems to be solved by the invention]
By the way, the front position of the wheel house, and the portion surrounded by the lower edge of the shroud panel, the lower edge of the front fender, and the lower edge of the front side frame is designed to open downward. There is a possibility that rain water or water on the road surface jumps from the lower opening into the space between the front fender and the front side frame and the engine room. If such a jump is excessive, water may enter the intake duct.
[0004]
The conventional intake duct is also provided with first and second intake resonators to reduce intake noise. Such an intake resonator has a volume of the intake resonator, the intake duct and each intake air. The frequency of intake noise that can be silenced is set according to the cross-sectional area and length of the communication pipe that communicates the resonator. In order to reduce the intake noise in the low frequency range, it is necessary to use an intake resonator having a relatively large volume, but such a space in the space between the front fender and the front side frame or in the engine room. It may be difficult to install a large volume intake resonator. For this reason, there is an inconvenience that intake noise cannot be sufficiently reduced.
[0005]
The present invention has been made in view of such circumstances, and its object is to enter water from the lower opening as described above between the lower end edge of the shroud panel in front of the wheel house. This is to surely prevent water from entering the intake duct, and to increase the volume of the intake resonator to sufficiently reduce intake noise.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention relates to an intake duct of an engine intake system, which is formed at a front position of a wheel house of a front wheel by a lower end edge of a shroud panel, a lower end edge of a front fender, and a front side frame. It is set as the structure arrange | positioned so that the lower side opening opened to the side may be closed.
[0007]
In the case of the above configuration, the lower opening formed by the lower end edge of the shroud panel, the lower end edge of the front fender, and the front side frame is closed by the intake duct at the front position of the front wheel house. It is possible to surely prevent the space between the front fender and the front side frame or the engine room from jumping up, and as a result, water can be prevented from entering the intake duct. It will definitely be possible.
[0008]
The intake duct may be arranged so as to fill a space surrounded by the front side wall of the mud flap, the shroud panel, and the front fender arranged in the wheel house .
[0009]
In the case of the above configuration, the lower opening of this space can be closed by arranging the air duct to fill the space surrounded by the front wall of the mud flap, the shroud panel, and the front fender. In addition, effective use of the space left as an unused space at the front of the vehicle body is achieved.
[0010]
The intake duct is provided with a plurality of silencers connected to the intake duct by a communication pipe, and the silencer having the maximum volume is disposed on the front side of the intake duct among the plurality of silencers. And the silencing means having the maximum volume is configured to be supported and fixed to the shroud panel by the lower end edge of the shroud panel, the lower end edge of the front fender, and the front side frame at the front wheel house front position. In order to effectively close the formed lower opening, water enters the air intake duct by preventing water from entering the space between the front fender and the front side frame or the engine room. This can be prevented more reliably. In addition, since the silencer is supported and fixed to the shroud panel, the support rigidity of the intake duct can be improved. Accordingly, the vibration of the intake duct itself is reduced, and it is possible to reduce the noise based on the vibration of the intake duct.
[0011]
The silencing means having the maximum volume is formed so as to fill the space surrounded by the mud flap front side wall, the shroud panel, and the front fender , so that the mud flap front side wall, the shroud panel, and the front fender are formed. It is possible to effectively use the space surrounded by and to dispose a relatively large volume as a silencer. In addition, the silencing means can effectively close the lower opening formed by the lower edge of the shroud panel, the lower edge of the front fender, and the front side frame at the front position of the wheel house. It becomes possible to reliably prevent water from entering the duct.
[0012]
A configuration in which the lower part of the shroud panel is formed so as to bulge forward in the front-rear direction of the vehicle body, and the silencing means having the maximum volume is disposed at the rear position of the shroud panel so as to follow the bulging shape of the shroud panel. It is good. The “bulge” is bulged in order to embed a headlamp, for example, in a recess formed in the upper portion of the shroud panel.
[0013]
In the case of the above configuration, the shape of the shroud panel is such that the headlamp is disposed above the bulging portion of the shroud panel, and a dead space is generated below the bulging portion. Then, by forming the silencer along the shape of the dead space and disposing it in the dead space, it is possible to dispose a relatively large volume as the silencer. For this reason, it becomes possible to reduce the low frequency sound by the large volume silencer.
[0014]
According to a second aspect of the present invention, in the first aspect of the present invention, the intake duct is formed to be curved in a U-shape, and the silencer is provided at an upper position of the curved portion of the intake duct and a lower side of the intake duct. It is set as the structure each arrange | positioned in a position and at least one side position in the front side and the rear side of the said intake duct. In the case of this configuration, the specific structures of the intake duct and the silencer are specified.
[0015]
The invention according to claim 3 is the structure according to claim 1 , wherein the volume, the cross-sectional area and the length of the communication pipe are set so that the plurality of silencers have different frequencies of the sound to be silenced. Is.
[0016]
In the case of the above configuration, it is possible to reduce intake noise in different frequency ranges by a plurality of silencers, and it is possible to effectively silence the intake noise.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0018]
FIG. 1 shows a front portion of a vehicle according to an embodiment of the present invention, and an intake duct 1 of an engine intake system is arranged at a left front position of the vehicle. In the figure, 1 is an intake duct for taking in air (intake) supplied to the engine 4, and 3 is an air cleaner for removing dust and the like contained in the intake air. 1 or 2, 51 is a front side frame extending in the longitudinal direction of the vehicle body, 52 is a wheel house of a front wheel, 53 is a shroud panel extending in the vehicle width direction at the front end of the front side frame 51, and 57 is the wheel house. A mud flap disposed on the outer side of the vehicle body 52 and along the arc shape of the wheel house 52. The intake duct 1 communicates with an air cleaner 3, and the air cleaner 3 is connected to an intake manifold (not shown) of the engine 4 (see FIG. 1). In FIG. 2, the left rear side of the page is the vehicle inner side, and the right front side is the vehicle outer side.
[0019]
The left front portion of the vehicle where the intake duct 1 is disposed is configured as follows. That is, as shown in FIGS. 2 to 5, a front side frame 51 extending from the shroud panel 53 extending in the vehicle width direction toward the rear of the vehicle is disposed, and the wheel house is disposed outside the vehicle body of the front side frame 51. 52 is formed. The wheel house 52 is formed integrally with the front fender apron 55. The front fender apron 55 is disposed so as to extend in the longitudinal direction of the vehicle body by a wall material extending in the vertical direction, and a lower part thereof is bent inward of the vehicle body so as to be in contact with an outer side edge of the front side frame 51. It has become. A mud flap 57 is disposed on the outer side of the vehicle body of the wheel house 52, and is attached to the front fender 56 by an attachment portion formed on the outer side edge of the vehicle body. As a result, the mud flap 57 is configured to block the space between the wheel house 52 (front fender apron 55) and the front fender 56, and stones and mud splashed by the front wheels are received by the mud flap 57. .
[0020]
Further, as shown in FIG. 2 or FIG. 4, the outer end of the vehicle body of the shroud panel 53 is downward from the upper position so that the headlamp 54 is disposed (see the one-dot chain line in FIG. 3 or FIG. 4). The bulging portion 53a bulges forward.
[0021]
A lower opening R is formed by the front edge of the mud flap 57, the lower edge of the shroud panel 53, the lower edge of the front fender 56, and the lower edge of the front side frame 51 (see FIG. 3 or Further, a space S is formed by the front wall of the mud flap 57, the bulging portion 53a of the shroud panel 53, the front fender 56, and the front side frame 51 (see FIG. 2). (See FIG. 5).
[0022]
As shown in FIG. 6 or FIG. 7, the intake duct 1 is formed in a U shape, and the upper end on the vehicle body outer side is an intake port 11 that opens toward the vehicle body inner side. On the other hand, the opening at the upper end on the vehicle body inner side is a discharge port 12 to which an air cleaner hose 31 communicating with the air cleaner 3 is connected (see FIG. 1). As shown in FIGS. 6 to 9, the intake duct 1 is formed in a hollow box shape, and first to third intake resonators as a silencer for reducing intake noise by resonance of air inside the intake duct 1. 21 to 23 are integrally formed, and the first intake resonator 21 is disposed at an upper position of a curved portion of the intake duct 1 and is connected to a peripheral surface of an inner portion of the intake duct 1 by a communication pipe 21a. It communicates with the intake duct 1 (see FIG. 7). The second intake resonator 22 is disposed at a lower position of the intake duct 1 and communicates with the intake duct 1 through a communication pipe 22a on the lower peripheral surface of the intake duct 1. (See FIG. 7 or FIG. 8). The third intake resonator 23 is disposed at a front side position of the intake duct 1, and the third intake resonator 23 is formed in a substantially L shape in a plan view (see FIG. 9), and is viewed from the side. Thus, it is formed in a shape along the bulging portion 53a of the shroud panel 53 (see FIG. 4 or FIG. 8). The third intake resonator 23 is arranged from the vehicle body inner side to the front side of the intake duct 1. The upper surface of the third intake resonator 23 is communicated with the peripheral surface of the vehicle interior side portion of the intake duct 1 through a communication pipe 23a (see FIG. 8 or FIG. 9). The first to third intake resonators 21, 22, and 23 are set so that the noise frequency that can be reduced varies depending on the volume, the diameter of the communication pipe, and the length of the communication pipe.
[0023]
A first mounting portion 13 is formed on the rear side of the intake duct 1 on the outer side of the vehicle body, and second and third mounting portions are formed on the inner side surface and the front side surface of the third intake resonator 23. Portions 14 and 15 are formed, respectively.
[0024]
The intake duct 1 is connected to the connecting member 55a that connects the front fender apron 55 and the front fender 56 by the first mounting portion 13, and the vehicle body outer side wall surface of the front side frame 51 by the second mounting portion 14. On the other hand, the third mounting portion 15 is fixed to the shroud panel 53 (see FIGS. 3 to 5).
[0025]
Next, the operation and effect of the above embodiment will be described.
[0026]
By the intake duct 1 and the third intake resonator 23, the lower opening R formed by the front edge of the mud flap 57, the lower edge of the shroud panel 53, the lower edge of the front fender 56, and the lower edge of the front side frame 51 is effective. (See FIG. 3 or FIG. 4). For this reason, it is possible to reliably prevent water from splashing into the space between the front side frame 51 and the front fender 56, and to prevent the water from entering the intake duct 1. become able to.
[0027]
Further, the third intake resonator 23 is formed so as to follow the shape of the bulging portion 53a of the shroud panel 53, and the front side wall of the mud flap 57, the bulging portion 53a of the shroud panel 53, the front fender 56, and the front side. By disposing in the space S formed by the frame 51, the third intake resonator 23 having the relatively large volume can be disposed. Therefore, the space S can be effectively used, and the third intake resonator 23 can reduce intake noise in a low frequency range.
[0028]
Further, since the third intake resonator 23 is supported and fixed to the shroud panel 53, the support rigidity of the intake duct 1 itself can be improved, and the vibration of the intake duct 1 can be reduced. Noise can be reduced based on the vibration of the intake duct 1.
[0029]
In addition, the first to third intake resonators 21 to 23 can reduce intake noise in different frequency ranges, respectively, and can effectively reduce the intake noise.
[0030]
<Other embodiments>
In addition, this invention is not limited to the said embodiment, Various other embodiments are included. That is, in the said embodiment, although the three of the 1st-3rd intake resonators 21-23 are used as a silencer, it is not restricted to this, For example, the said intake resonator may be three or more.
[0031]
In the above embodiment, the intake air is taken into the vehicle in which the lower opening R is formed by the front edge of the mud flap 57, the lower edge of the shroud panel 53, the lower edge of the front fender 56, and the lower edge of the front side frame 51. Although the duct 1 and the first to third intake resonators 21 to 23 are arranged, the present invention is not limited thereto, and for example, as shown in FIG. 10, the front side frame 51 'has a substantially rectangular cross section. The front side apron 55 ′ is formed so as to bend and extend downward from a portion of the front side frame 51 ′ that is in contact with the outer edge of the vehicle body, and the lower side opening R ′ and the space S ′. The air intake duct 1 may be provided for the vehicle whose inner side is constituted by the lower end edge of the front side apron 55 '.
[0032]
【The invention's effect】
As described above, according to the arrangement structure of the engine intake system of the present invention, the lower portion formed by the lower edge of the shroud panel, the lower edge of the front fender, and the front side frame at the front wheel house front position. Since the side opening is closed by the intake duct, it is possible to reliably prevent water from splashing into the space between the front fender and the front side frame or the engine room. It is possible to reliably prevent water from entering the inside.
[0033]
Further, muffler having a maximum volume, in front of the wheel house forward position, the lower edge of the shroud panel, a front fender lower edge, for closing the front side frame and a lower opening formed by effectively The water can be prevented from entering the space between the front fender and the front side frame or the engine room, and the water can be more reliably prevented from entering the intake duct. . In addition, since the silencer is supported and fixed to the shroud panel, the support rigidity of the intake duct can be improved. Accordingly, the vibration of the intake duct itself can be reduced, and the noise based on the vibration of the intake duct can be reduced.
[0034]
Further, the silenced device, and Mudflap front wall, a shroud panel, while effectively utilizing the enclosed space in the front fender, in front of the wheel house, and the lower edge of the shroud panel, a front fender lower edge, By effectively closing the lower opening formed by the front side frame, water can be reliably prevented from entering the intake duct.
[0035]
In addition, by utilizing the dead space created by the bulging portion a shape of a shroud panel headlamp is disposed in the bulging portion above the sheet Yuraudopaneru, disposing the a relatively large volume as muffler Can do. For this reason, the low-frequency sound can be reduced by the large volume silencer.
[0036]
According to the second aspect of the invention, in addition to the effect of the first aspect of the invention, the specific structures of the intake duct and the silencer can be specified.
[0037]
According to the third aspect of the invention, in addition to the effect of the first aspect of the invention, the sound of different frequencies can be reduced by the plurality of silencer means, and the intake noise can be effectively silenced. be able to.
[Brief description of the drawings]
FIG. 1 is an explanatory plan view in which a part of a front portion of a vehicle is omitted.
FIG. 2 is a perspective view showing an intake duct arrangement structure according to an embodiment of the present invention.
FIG. 3 is a front view showing an intake duct arrangement structure.
FIG. 4 is a left side view showing an intake duct arrangement structure.
FIG. 5 is a plan view showing an intake duct arrangement structure.
FIG. 6 is a perspective view showing an intake duct.
FIG. 7 is a front view showing an intake duct.
FIG. 8 is a left side view showing an intake duct.
FIG. 9 is a plan view showing an intake duct.
FIG. 10 is a view corresponding to FIG. 3, showing an intake duct arrangement structure according to another embodiment.
[Explanation of symbols]
1 Intake ducts 21 to 23 First to third intake resonators (silencers)
51 Front side frame 52 Wheel house 53 Shroud panel 56 Front fender 57 Mud flaps 21a to 23a Communication pipe R Lower opening S Space

Claims (3)

The intake duct of the engine intake system closes the lower opening formed by the lower edge of the shroud panel, the lower edge of the front fender, and the front side frame at the front position of the front wheel house. is disposed,
The lower part of the shroud panel is formed so as to bulge forward in the longitudinal direction of the vehicle body,
The intake duct is provided with a plurality of silencers connected to the intake duct by a communication pipe,
Among the plurality of silencers, the silencer having the maximum volume is shaped to fill a space surrounded by the front side wall of the mud flap, the shroud panel, and the front fender disposed in the wheel house. Formed and disposed on the front side of the intake duct and behind the shroud panel so as to follow the swelled shape of the shroud panel, and is supported and fixed to the shroud panel. > Engine intake system arrangement structure characterized by this. Oite the arrangement structure of an engine intake system according to claim 1,
The intake duct is formed in a U-shaped curve,
The silencing means is disposed at an upper position of the curved portion of the intake duct, a lower position of the intake duct, and at least one position of the front side and the rear side of the intake duct, respectively. Arrangement structure of the engine intake system. Oite the arrangement structure of an engine intake system according to claim 1,
The arrangement structure of the engine intake system, characterized in that the volume, the cross-sectional area and the length of the communication pipe are set so that the frequencies of the sound to be silenced are different from each other.

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