JPH065232Y2 - Air introduction device for internal combustion engine for vehicle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an air introducing device for introducing atmospheric air into an air cleaner.

[Conventional technology]

When the atmospheric air is introduced into the air cleaner through the air introduction duct, intake noise is generated. Therefore, Japanese Utility Model Laid-Open No. 54-74420 as a prior art aims to mitigate the intake noise by providing an expansion chamber having a rapidly enlarged cross-sectional area in the middle of an air introduction duct to the air cleaner. By arranging this expansion chamber in the space between the fender of the vehicle and the fender apron inside the fender, it is possible to avoid the reduction of the internal volume of the engine room for providing the expansion chamber. is suggesting.

[Problems to be solved by the device]

However, in this prior art, the air introduction duct inserted in the space between the fender and the fender apron is inclined obliquely downward toward the front of the vehicle, and the air intake at its tip is at the bottom of the vehicle body. While opening to the atmosphere, the expansion chamber is provided in the middle of this air introduction duct so as to extend in the axial direction of the air introduction duct, and the air intake at the tip of the air introduction duct is located near the ground. In addition, water is easily sucked into the vehicle while the vehicle is traveling, and the expansion chamber is not configured to separate water droplets in the expansion chamber. Since the water droplets reach the air cleaner as it is, there is a great risk of damaging the filter element in the air cleaner.

Further, when the intake noise is silenced by the expansion chamber provided in the middle of the air introduction duct to the air cleaner, it is necessary to make the internal volume of the expansion chamber as large as possible, and the expansion chamber from the expansion chamber to the air intake port. The length also needs to be a certain length or more, but as in the above-mentioned prior art, the expansion chamber arranged in the space between the fender and the fender lopron extends in the axial direction of the air introduction duct. In the case of the form, there is a certain limit to the diameter of the expansion chamber, so if the length is increased to increase the internal volume of the expansion chamber, the length from the expansion chamber to the air intake is increased. It must be shortened, and if the length from the expansion chamber to the air intake is increased, the internal volume in the expansion chamber must be reduced.

Japanese Utility Model Laid-Open No. 61-17335 discloses another prior art, in which an expansion chamber having a rapidly enlarged cross-sectional area is provided in the middle of an air introduction duct to the air cleaner, and an outlet pipe from the expansion chamber to the air cleaner is provided. It is proposed that the atmospheric air intake pipe from the air intake port be connected laterally to the expansion chamber at a position at substantially the same height.

However, with this configuration, the water droplets that flow from the air intake through the atmospheric air suction pipe into the expansion chamber together with the air, follow the flow of the air as they are, and flow out together with the air from the outlet pipe. There is a great risk of damaging the filter element at.

An object of the present invention is to provide an air introducing device that solves these problems.

[Means for Solving the Problems]

In order to achieve this object, the present invention provides an expansion chamber at a lower portion in a space between a vehicle fender and an inner fender apron, and connects an outlet pipe to an upper surface of the expansion chamber so as to extend upward. Then, the upper end thereof is formed into a horizontal elbow pipe, and an air introduction duct to the air cleaner is connected to this, while a part of the upper surface of the expansion chamber is made lower than the connecting portion of the outlet pipe. An air intake pipe extending upward from the expansion chamber and having an air intake port at its upper end is connected to the recess, and this air intake pipe is connected to the air intake port at its upper end. A resonator that extends to a position higher than the lateral elbow pipe at the upper end of the outlet pipe and is connected to this atmospheric air intake pipe is disposed at the upper end of the lateral elbow pipe at the upper end of the outlet pipe. It was formed.

[Action]

According to this structure, the air cleaner, and thus the atmospheric air to the internal combustion engine, is taken in from the air intake port at the upper end of the atmospheric air intake pipe, and flows downward from above into the expansion chamber via the atmospheric air intake pipe, After the direction is changed to the upward flow in the expansion chamber, it flows out from the outlet pipe and is guided to the air cleaner through the air introduction duct.

In this case, the atmospheric air intake pipe is projected upward from the expansion chamber arranged in the lower part of the space between the fender and the fender apron, and the air intake at the upper end thereof is located at the upper end of the outlet pipe from the expansion chamber. By extending to a position higher than the lateral elbow pipe, since the air intake is located at a position higher than the ground, it is possible to prevent water from entering the air intake more than in the prior art. It can be greatly reduced.

On the other hand, the water droplets entrained in the atmospheric air are separated from the air in the expansion chamber by both the expansion action when flowing into the expansion chamber and the 180 degree change in the flow direction from the downward direction to the upward direction in the expansion chamber. It will be.

In addition, a recess is formed on the upper surface of the expansion chamber so that a part of the upper surface is lowered, and an atmospheric air intake pipe from the air intake port is connected to the inside of the recess. Since the length of becomes longer by the amount corresponding to the depth of the recess, the length from the expansion chamber to the air intake, that is,
The height dimension of the expansion chamber can be increased while the length of the atmospheric air suction pipe is ensured to be a predetermined length.

Further, a recess is formed on the upper surface of the expansion chamber so that a part of the upper surface is lowered, and an atmospheric air intake pipe from the air intake is connected to the recess, thereby expanding the outlet pipe. The opening to the chamber is higher than the opening to the expansion chamber of the atmospheric air intake pipe, and the water droplets that have flowed into the expansion chamber together with air from the atmospheric air intake pipe do not immediately flow out from the outlet pipe and expand. Since the air is separated from the air in a portion of the chamber between the opening of the atmospheric air suction pipe and the opening of the outlet pipe, this fact, the expansion action in the expansion chamber and the direction change of 180 degrees. Together with the above, the water droplets can be greatly improved and the water droplets that reach the air cleaner together with the air can be reliably reduced.

Furthermore, in addition to extending the atmospheric air intake pipe until the air intake at its upper end is located at a position higher than the lateral elbow pipe at the upper end of the outlet pipe from the expansion chamber, By connecting the resonator disposed on the upper portion of the lateral elbow pipe at the upper end of the outlet pipe, the space above the lateral elbow pipe at the upper end of the outlet pipe,
It can be effectively used for installing a resonator to reduce intake noise.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. In the drawings, reference numeral 1 denotes an internal combustion engine mounted in an engine room 3 at the front of a vehicle body frame 2, and intake air to the internal combustion engine 1 is the vehicle body frame. 2 on the right side of the fender 4 and a fender apron 5 opposite to the inside
After being taken in by the air introduction device 7 arranged in the space 6 between the engine room 2 and the air chamber, it is guided to the internal combustion engine 1 via the air cleaner 8 and the intake manifold 9 arranged in the engine room 2. .

Further, the air introducing device 7 is provided with an expansion chamber 10 disposed at a lower portion in a space portion 6 between the fender 4 and a fender apron 5 that is provided inside thereof, and protrudes upward from the expansion chamber 10, respectively. Which is composed of the atmospheric air intake pipe 11 and the outlet pipe 12 and the resonator 13, and a recess 14 is formed on the upper surface of the expansion chamber 10 so that a part of the upper surface is lowered. The atmospheric air intake pipe 11 is connected to the inside thereof, and an air intake port 15 opening forward is provided at the upper end of the atmospheric air intake pipe 11, and the resonator 13 is connected to the atmospheric air intake pipe 11. While being connected through a small-diameter through hole 16, a lateral elbow pipe is formed at the upper end of the outlet pipe 12, and the air cleaner 8 is attached to this.
The air intake pipe 15 at the upper end of the atmospheric air suction pipe 11 is located at a position higher than the lateral elbow pipe at the upper end of the outlet pipe 12 while connecting the atmospheric air introduction pipe 17 to
Further, the resonator 13 is arranged above the laterally-elbowed pipe at the upper end of the outlet pipe 12.

The expansion chamber 10 and the outlet pipe 12 are integrally formed by blow molding of synthetic resin, and the atmospheric air suction pipe 11 with the resonator 13 is connected to the upper surface of the expansion chamber 10.

Air intake 14 at the upper end of the atmospheric air intake pipe 11
From the above, the air introduced into the atmospheric air intake pipe 11 as shown by the arrow A flows downward into the expansion chamber 10 through the atmospheric air intake pipe 11 from above to the arrows B, C, and As shown by D, after the direction is changed to the upward flow, it flows out from the outlet pipe 12 and is guided to the air cleaner 8 via the atmospheric air introduction pipe 17, and in this case, the intake noise radiated into the atmosphere. Of the high frequency range, the high frequency range is silenced by the resonance action of the resonator 13 connected to the atmospheric air intake pipe 11 through the small-diameter through hole 16, and the low frequency range of the intake noise is the expansion chamber. The sound is silenced by the expansion action within 10.

In addition, the water droplets entrained in the air flowing into the atmospheric air intake pipe 11 from the air intake port 15 at the upper end of the atmospheric air intake pipe 11 expands when entering the expansion chamber 10 and the expansion chamber 10 Both by changing the flow direction from downward to upward in the interior of the expansion chamber 10 to be separated and separated from the air,
After being collected on the inner bottom surface of the expansion chamber 10, the water is discharged from the drain hole 18 provided at the bottom of the expansion chamber 10.

In addition, reference numeral 19 in the figure indicates that the ambient air intake pipe 1 is formed by winding the ambient air intake pipe 11 around the upper end of the ambient air intake pipe 11.
1 is a sponge body for filling the gaps between 1 and the fender 4 and the fender apron 5. Further, reference numeral 20 in the drawing
Indicates a front balance panel forming the front surface of the front engine room 3, and a portion of the front side surface of the expansion chamber 10 exposed from the cutout portion 20a in the front balance panel 20 is surrounded by the cutout portion 20a. A protrusion 21 is integrally formed along the protrusion 21 so that the traveling wind hitting the front side surface of the expansion chamber 10 in the direction of the arrow E is generated.
The water is prevented from entering the back surface side of the front balance panel 20 by deflecting and guiding it in the direction of arrow F.

[Effect of device]

As described above, the present invention has the structure described in the scope of claims for utility model registration. An expansion chamber for silencing intake air noise is arranged in a lower part in a space between the fender and a fender apron inside the fender, and an atmospheric air intake pipe having an air intake port at an upper end is provided on an upper surface of the expansion chamber. Is connected so that the air intake extends upward from the expansion chamber to a position higher than the lateral elbow pipe at the upper end of the outlet pipe, so that the air intake is located at a position higher than the ground, and In, it is possible to reduce the amount of water that enters the air intake.

． On the upper surface of the expansion chamber, a recess for lowering a part of the upper surface was provided, and the atmospheric air suction pipe was connected to the expansion chamber in the recess, so that the length of the atmospheric air suction pipe was secured to a predetermined length. Since the internal volume of the expansion chamber can be increased under the state, the effect of silencing intake noise by the expansion chamber can be reliably achieved.

． An outlet pipe is connected to the upper surface of the expansion chamber so as to extend upward, and an air introduction duct to the air cleaner is connected to the outlet pipe, while a recess for lowering a part of the upper surface is provided on the upper surface of the expansion chamber. By connecting the atmospheric air intake pipe so as to extend upward in this recess, the water droplets entrained in the air are expanded in the expansion chamber, and the direction of the flow is changed by 180 degrees, and the atmospheric air intake pipe Combined with the difference in height between the opening to the expansion chamber and the opening to the expansion chamber of the outlet pipe, the number of water droplets sucked into the air cleaner together with the air can be significantly reduced, and It is possible to surely prevent the filter element from being damaged by.

． In addition to extending the atmospheric air intake pipe until the air intake at its upper end is located at a position higher than the lateral elbow pipe at the upper end of the outlet pipe from the expansion chamber, this atmospheric air intake pipe is connected to the outlet pipe. By connecting the resonator disposed on the upper portion of the lateral elbow pipe at the upper end of the, the space of the lateral elbow pipe upper portion at the upper end of the outlet pipe can be effectively used for the installation of the resonator for reducing intake noise, Although the intake noise can be surely reduced by the resonator, it can be made compact.

Have the effect of.

[Brief description of drawings]

The drawings show an embodiment of the present invention. Fig. 1 is a plan view of a front engine room of a vehicle, Fig. 2 is an enlarged sectional view taken along line II-II of Fig. 1, and Fig. 3 is III-III of Fig. 2. FIG. 4 is a sectional view taken along line IV-IV of FIG. 3, FIG. 5 is a sectional view taken along line VV of FIG. 3, and FIG. 6 is a sectional view taken along line VI-VI of FIG. . 1 ... Internal combustion engine, 2 ... Body frame, 3 ... Front engine room, 4 ... Fender, 5 ... Fender apron, 6 ... Space part, 7 ... Air introduction device, 8 ... Air cleaner, 9 ... ... intake manifold, 10 ... expansion chamber,
11 ... Atmosphere air suction pipe, 12 ... Outlet pipe, 13 ... Resonator, 14 ... Recess, 15 ... Air intake, 17 ...
… Air introduction duct to the air cleaner.

Claims (1)

[Scope of utility model registration request] 1. An expansion chamber is arranged in a lower portion in a space portion between a fender of a vehicle and a fender apron inside thereof.
An outlet pipe is connected to the upper surface of the expansion chamber so as to extend upward, the upper end thereof is formed into a lateral elbow pipe, and an air introduction duct to an air cleaner is connected to this, while the upper surface of the expansion chamber is connected to the upper surface. Is provided with a recess formed such that a part of the recess is lower than the connecting portion of the outlet pipe, and an atmospheric air intake pipe that extends upward from the expansion chamber and has an air intake port at the upper end is connected to the recess. And extending the air intake pipe until the air intake at the upper end is located at a position higher than the lateral elbow pipe at the upper end of the outlet pipe, and
An air introducing device for an internal combustion engine for a vehicle, wherein a resonator arranged above the lateral elbow pipe at the upper end of the outlet pipe is connected to the atmospheric air intake pipe.