JP2005030303A - Air intake duct for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air intake duct for vehicle to reliably lead air from an air intake port to an engine via an air cleaner even when the air intake port is closed. <P>SOLUTION: In the air intake duct for vehicle having a duct to lead air from an air intake port to an air cleaner, a window part is formed in the duct, and an opening member to automatically open the window part by the atmospheric pressure when the pressure in the dust is lower than the predetermined negative pressure is provided on the window part. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicle intake duct that guides air from an intake port to an engine via an air cleaner.
[0002]
[Prior art]
Conventionally, in a vehicle such as a large truck, for example, as disclosed in Japanese Utility Model Laid-Open No. 3-121919, an intake duct of an engine is extended upward along the back surface of the cab, and an intake port is provided at the tip. It has been known.
[0003]
In such an intake duct, a wire mesh or the like is stretched at the intake port so as not to suck in large dust or the like.
[Patent Document 1]
Japanese Utility Model Publication No. 3-121919 [0004]
[Problems to be solved by the invention]
However, in the intake duct as described above, for example, when the entire intake port is covered with a vinyl sheet, it becomes difficult to suck air from the intake port, causing problems such as sudden failure of the engine. There was a problem of fear.
[0005]
The present invention has been made to solve such a conventional problem, and an object of the present invention is to provide a vehicle intake duct that can reliably supply air to an air cleaner even when the intake port is blocked. To do.
[0006]
[Means for Solving the Problems]
The vehicle air intake duct according to claim 1 is a vehicle air intake duct having a duct for guiding air from an air inlet to an air cleaner. The vehicle air intake duct forms a window in the duct, and the inside of the duct is predetermined in the window. An opening member is provided for automatically opening the window portion by atmospheric pressure when the negative pressure is reduced.
[0007]
A vehicle intake duct according to a second aspect is the vehicle intake duct according to the first aspect, wherein the opening member is swingably supported by the window portion.
A vehicle air intake duct according to a third aspect is characterized in that, in the vehicle air intake duct according to the second aspect, the open end of the opening member is clipped to a locking hole formed in the duct.
[0008]
The vehicle intake duct according to claim 4 is the vehicle intake duct according to claim 2, wherein an open end of the open member is locked to the duct by a spring member.
The vehicle air intake duct according to claim 5 is the vehicle air intake duct according to claim 1, wherein the opening member is made of a soft elastic body that covers the window portion from the outside of the window portion, and the inside of the duct is predetermined. When the pressure becomes smaller than the negative pressure, the open end of the soft elastic body is drawn into the duct to open the window.
[0009]
(Function)
In the vehicle intake duct according to the first aspect, air from the intake port is guided to the air cleaner through the duct by the suction action of the air cleaner.
When the intake port is closed by a vinyl sheet or the like, the air in the duct is sucked by the air cleaner in a state where no air is supplied from the intake port, and the pressure in the duct is smaller than a predetermined negative pressure. Become.
[0010]
As a result, the differential pressure inside and outside the duct increases, and the opening member disposed in the window portion is opened by the atmospheric pressure, and air is supplied from the window portion into the duct.
In the vehicle intake duct according to the second aspect, the opening member is swingably supported by the window portion, and the window portion is opened by the swinging of the opening member.
In the vehicle air intake duct according to claim 3, when the open end of the opening member is clipped to a locking hole formed in the duct and the pressure difference between the inside and outside of the duct exceeds a predetermined value, The clip is released and the opening member is opened.
[0011]
In the vehicle intake duct according to the fourth aspect, the open end of the open member is locked to the duct by the spring member, and when the pressure difference between the inside and outside of the duct exceeds a predetermined value, the open end is detached from the spring member. The opening member is opened.
In the vehicle intake duct according to the fifth aspect, the opening member is a soft elastic body that covers the window portion from the outside of the window portion.
[0012]
When the inside of the duct becomes smaller than a predetermined negative pressure, the open end of the soft elastic body is drawn into the duct and the window portion is opened.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0014]
(First embodiment)
FIG. 1 shows a first embodiment of a vehicle intake duct according to the present invention.
In this embodiment, the present invention is applied to a vehicle intake duct for a heavy truck equipped with a cab.
In FIG. 1, the code | symbol 11 has shown the cab back duct extended upwards along the back surface of the cab of the track which is not shown in figure.
[0015]
An intake port 13 is opened at the top of the cab back duct 11.
The lower end of the cab back duct 11 is connected to the inlet duct 21 of the air cleaner 19 via a bellows-like hose 15 and an arc-shaped connecting duct 17.
The outlet side duct 23 of the air cleaner 19 is connected to an intake manifold (not shown) of the engine.
[0016]
In this embodiment, a rectangular window 25 is formed below the intake port 13 of the cab back duct 11.
FIG. 2 shows details of the window portion 25, and an opening member 27 made of, for example, resin, metal or the like is disposed inside the window portion 25.
The opening member 27 is supported by the fixing member 31 via a hinge 29.
[0017]
The fixing member 31 is fixed to the upper vicinity of the window portion 25 of the cab back duct 11 with a screw or an adhesive.
A clip 33 is disposed at the open end 27 a of the open member 27.
[0018]
The clip 33 is locked in a locking hole 35 formed near the lower portion of the window portion 25 of the cab back duct 11.
FIG. 3 shows details of the clip 33, and the clip 33 has an arcuate elastic deformation portion 37. A plurality of the elastic deformation portions 37 are formed at a predetermined angle in the circumferential direction.
[0019]
The outer diameter of the elastically deforming portion 37 of the clip 33 is such that when the clip 33 is inserted into the locking hole 35, the elastic deforming portion 37 is deformed by a predetermined amount and is held in the locking hole 35 with a predetermined force. The dimensions are as follows.
In other words, when the inside of the cab back duct 11 becomes smaller than a predetermined negative pressure, the dimension is set such that the clip 33 is detached from the locking hole 35 due to the pressure difference between the inside and outside of the cab back duct 11.
[0020]
In the vehicle air intake duct described above, air from the air inlet 13 is guided to the air cleaner 19 through the cab back duct 11, the hose 15, and the duct 17 by the suction action of the air cleaner 19, and the engine via the intake manifold (not shown). To be supplied.
When the air inlet 13 is closed by, for example, a vinyl sheet or the like, the air in the cab back duct 11 is sucked by the air cleaner 19 in a state in which no air is supplied from the air inlet 13, and the air in the cab back duct 11 is Is less than a predetermined negative pressure.
[0021]
As a result, the differential pressure inside and outside the cab back duct 11 increases, and the clip 33 is detached from the locking hole 35 of the cab back duct 11 as shown in FIG. 27 is opened, and air A is supplied into the cab back duct 11 from the window 25.
In the vehicle air intake duct described above, the window portion 25 is formed in the cab back duct 11, and when the inside of the cab back duct 11 becomes smaller than a predetermined negative pressure in the window portion 25, the window portion 25 is opened by atmospheric pressure. Since the opening member 27 that automatically opens is provided, air can be reliably supplied to the air cleaner 19 even when the intake port 13 is closed.
[0022]
Therefore, it is possible to effectively prevent the engine from suddenly becoming unable to blow or damaging the intake system.
In addition, since the opening member 27 disposed in the window portion 25 is automatically opened by the atmospheric pressure, high reliability can be obtained with a simple structure.
In the vehicle air intake duct described above, the opening member 27 is swingably supported by the window portion 25, so that the window portion 25 can be easily and reliably opened.
[0023]
Further, in the above-described vehicle intake duct, the open end 27a of the opening member 27 is fixed to the locking hole 35 formed in the cab back duct 11 by the clip 33, so that the pressure difference between the inside and outside of the cab back duct 11 is determined in advance. When the determined value is exceeded, the opening member 27 can be reliably opened.
Further, in the above-described vehicle intake duct, when the opening member 27 of the window portion 25 is opened, the flow rate of the air changes drastically, so that the manner of vibration of the cab back duct 11 changes, and thus the driver takes in the intake air. It can be surely known that the mouth 13 is closed.
[0024]
In the present invention, the opening of the opening member 27 is temporary emergency evacuation. After the vehicle is stopped in a safe place and a vinyl sheet or the like is removed from the air inlet 13, the clip 33 of the opening member 27 is removed. Is again locked in the locking hole 35 of the cab back duct 11.
(Second Embodiment)
FIG. 5 shows the details of the main part of the second embodiment of the vehicle intake duct of the present invention.
[0025]
In this embodiment, the same members as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
In this embodiment, as shown in FIG. 5, an opening member 27 </ b> A made of, for example, resin, metal, or the like is disposed inside the window portion 25.
The opening member 27 </ b> A is supported by the fixing member 31 via a hinge 29.
[0026]
The fixing member 31 is fixed to the upper vicinity of the window portion 25 of the cab back duct 11 with a screw or an adhesive.
The open end 27a of the open member 27A is locked to the cab back duct 11 by a leaf spring 39 that is a spring member.
The leaf spring 39 is made of a material such as metal, rubber, or resin.
[0027]
That is, a pressing portion 39a is formed on the upper portion of the leaf spring 39, and the open end 27a of the opening member 27A is pressed with a predetermined pressure between the pressing portion 39a and the cab back duct 11.
A fixing portion 39b is formed below the leaf spring 39, and this fixing portion 39b is fixed near the lower portion of the window portion 25 of the cab back duct 11 with a screw or an adhesive.
[0028]
The pressing force of the pressing portion 39a of the leaf spring 39 is reduced by the pressure difference between the inside and outside of the cab back duct 11 when the inside of the cab back duct 11 becomes smaller than a predetermined negative pressure. However, the dimension is such that it separates from the leaf spring 39 against the pressing force of the leaf spring 39.
In the vehicle air intake duct of this embodiment, when the pressure in the cab back duct 11 becomes smaller than a predetermined negative pressure and the differential pressure inside and outside the cab back duct 11 becomes large, as shown in FIG. The opening end 27a of the opening member 27A is released from the pressing portion 39a of 39, the opening member 27A disposed in the window portion 25 is opened, and air A is supplied from the window portion 25 into the cab back duct 11.
[0029]
The vehicle intake duct of this embodiment can achieve the same effect as that of the first embodiment, but in this embodiment, the open end 27a of the open member 27A is engaged with the cab back duct 11 by the leaf spring 39. Since it stopped, when the pressure difference inside and outside the cab back duct 11 exceeds a predetermined value, the opening member 27A can be reliably opened.
[0030]
(Third embodiment)
FIG. 7 shows the details of the main part of the third embodiment of the vehicle intake duct of the present invention.
In this embodiment, the same members as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
In this embodiment, as shown in FIG. 7, an opening member 27 </ b> B made of a soft elastic body such as rubber is disposed outside the window portion 25 so as to cover the entire window portion 25.
[0031]
The upper end of the opening member 27B is fixed near the upper portion of the window portion 25 by screws, baking, adhesive, or the like.
The open end 27a of the open member 27B extends from the lower end of the window portion 25 by a length L.
The extension length L of the open end 27a of the open member 27B is caused by the pressure difference between the inside and outside of the cab back duct 11 when the inside of the cab back duct 11 becomes smaller than a predetermined negative pressure. The opening end 27 a is dimensioned to be drawn inside the window portion 25.
[0032]
In the vehicle intake duct of this embodiment, when the pressure in the cab back duct 11 becomes smaller than a predetermined negative pressure and the differential pressure inside and outside the cab back duct 11 becomes large, as shown in FIG. The open end 27a of the body opening member 27B is drawn into the cab back duct 11, a gap is formed in the window portion 25, and air A is supplied from the window portion 25 into the cab back duct 11.
[0033]
In the vehicle air intake duct of this embodiment, the same effect as that of the first embodiment can be obtained, but in this embodiment, the window portion 25 is connected to the window portion 25 by the opening member 27B made of a soft elastic body. Since it was made to cover from the outside, the release member 27B can be easily returned to its original state after emergency evacuation.
[0034]
In the above-described embodiment, an example in which the present invention is applied to a large truck has been described. However, the present invention is not limited to such an embodiment, and can be widely applied to vehicles such as passenger cars. .
[0035]
【The invention's effect】
As described above, in the vehicle air intake duct according to the first aspect, the window is formed in the duct, and when the inside of the duct becomes smaller than the predetermined negative pressure, the window is automatically opened by the atmospheric pressure. Since the opening member that opens automatically is provided, air can be reliably supplied to the air cleaner even when the intake port is closed.
[0036]
Moreover, since the opening member arrange | positioned at a window part is automatically open | released by atmospheric pressure, high reliability can be acquired with a simple structure.
In the vehicle intake duct according to the second aspect, since the opening member is swingably supported by the window portion, the window portion can be easily and reliably opened.
In the vehicle intake duct according to claim 3, since the open end of the open member is clipped to a locking hole formed in the duct, the open member is opened when the pressure difference between the inside and outside of the duct exceeds a predetermined value. Can be reliably opened.
[0037]
In the vehicle intake duct according to claim 4, since the open end of the open member is locked to the duct by the spring member, the open member is surely opened when the pressure difference between the inside and outside of the duct exceeds a predetermined value. can do.
In the vehicle intake duct according to the fifth aspect, since the window portion is covered from the outside of the window portion by the opening member made of a soft elastic body, the opening member can be easily returned to the original state.
[Brief description of the drawings]
FIG. 1 is an explanatory view showing a first embodiment of a vehicle intake duct according to the present invention.
2 is an explanatory view showing details of a window portion of the vehicle intake duct of FIG. 1; FIG.
FIG. 3 is an explanatory view showing details of the clip of FIG. 2;
4 is an explanatory view showing a state in which the opening member has opened the window portion in FIG. 2. FIG.
FIG. 5 is an explanatory view showing a main part of a second embodiment of the vehicle intake duct according to the present invention.
6 is an explanatory view showing a state in which the opening member has opened the window portion in FIG. 5. FIG.
FIG. 7 is an explanatory view showing a main part of a third embodiment of a vehicle intake duct according to the present invention.
FIG. 8 is an explanatory view showing a state in which the opening member opens the window portion in FIG. 7;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 Cab back duct 13 Air inlet 19 Air cleaner 25 Window part 27,27A, 27B Opening member 27a Open end 33 Clip 39 Leaf spring

Claims (5)

In a vehicle intake duct having a duct for guiding air from the intake port to an air cleaner,
A window is formed in the duct, and an opening member is provided in the window so as to automatically open the window by atmospheric pressure when the inside of the duct becomes smaller than a predetermined negative pressure. An air intake duct for vehicles. The vehicle intake duct according to claim 1,
An intake duct for a vehicle, wherein the opening member is swingably supported by the window portion. In the vehicle intake duct according to claim 2,
An air intake duct for vehicles, wherein an open end of the open member is clipped to a locking hole formed in the duct. In the vehicle intake duct according to claim 2,
An intake duct for a vehicle, wherein an open end of the open member is locked to the duct by a spring member. The vehicle intake duct according to claim 1,
The opening member is made of a soft elastic body that covers the window portion from the outside of the window portion, and when the inside of the duct becomes smaller than a predetermined negative pressure, the open end of the soft elastic body is in the duct. The vehicle air intake duct is drawn into the vehicle and opens the window.

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