JP2528635Y2 - Air ducts for internal combustion engines for automobiles - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention uses atmospheric air for an internal combustion engine mounted on a car,
The present invention relates to an improvement of an air duct used when guiding through an air cleaner.

[Conventional technology]

Generally, in an internal combustion engine for an automobile, atmospheric air is once introduced into an air cleaner via an air duct,
It is well known that the air cleaner is guided to the intake manifold in the internal combustion engine via an air duct.

Also, the air duct for taking in atmospheric air into the air cleaner or the air duct for introducing air from the air cleaner to the intake manifold must have a sufficient cross-sectional area to allow a sufficient amount of air necessary for operation of the internal combustion engine. Originally, these air ducts for intake of atmospheric air or air to be arranged in a narrow and complicated space between the internal combustion engine or various accessories and the body frame, etc. It is also well known that the introduction air duct is made of rubber or synthetic resin and its cross section is formed in a flat cross section such as a rectangle or an ellipse.

However, in the two air ducts, a negative pressure lower than the atmospheric pressure is generated due to the suction of the atmospheric air into the internal combustion engine. Therefore, both the air ducts are made of rubber or synthetic resin, and the cross section thereof is rectangular. Alternatively, forming the air duct into a flat cross-sectional shape such as an ellipse causes the two air ducts to dent and deform due to the negative pressure.

Therefore, conventionally, when the air duct for introducing atmospheric air or the air duct for introducing air is formed into a flat cross-sectional shape such as a rectangle or an ellipse with rubber or synthetic resin as described above, the outer peripheral surface thereof is reinforced. By integrally forming the ribs for use, dent deformation due to negative pressure is prevented (for example, Japanese Utility Model Laid-Open No. 56-88944).

[Problems to be solved by the invention]

However, forming the reinforcing ribs integrally on the outer peripheral surface of the air duct for taking in atmospheric air into the air cleaner, or the air duct for introducing air from the air cleaner to the intake manifold, means that the outer diameter of both air ducts is Since the ribs are so large, they cannot be arranged in a narrow space between the internal combustion engine and various accessories or the body frame.

For this reason, it is necessary to enlarge the space for disposing the air ducts or to reduce the cross-sectional area of the air ducts. However, reducing the cross-sectional area as in the latter case increases the flow resistance of the intake air, resulting in a decrease in the output of the internal combustion engine.

SUMMARY OF THE INVENTION An object of the present invention is to provide an air duct that solves the above-mentioned problem with the conventional air duct.

[Means for solving the problem]

In order to achieve this goal, the present invention provides an air duct for introducing air into the air cleaner,
An air duct for introducing air from the air cleaner to the intake manifold, in a vehicle internal combustion engine having a cross section formed of rubber or synthetic resin into a flat cross section such as a rectangle or an ellipse, the air duct for taking in atmospheric air or A protrusion configured to extend in the axial direction of the air duct is provided on each of the substantially central portions of the wide inner surfaces opposing each other on the inner surface of the air introduction air duct, when the air duct is further deformed so as to be flatter. Are integrally formed so as to abut each other. "

[Action]

With this configuration, when a negative pressure acts on the air duct for taking in atmospheric air or the air duct for introducing air, and the air duct is further deformed to be flat, the inner surfaces of the air duct face each other. Since the integrally formed projections abut each other at substantially the center portions of the wide inner surfaces, it is possible to prevent the projections from being further flattened, so that the air duct for taking in atmospheric air can be prevented. Alternatively, inside the air duct for air introduction, a passage cross-sectional area capable of flowing a sufficient amount of air necessary for the operation of the internal combustion engine is formed, and a reinforcing rib for preventing dent deformation on the outer peripheral surface of the air duct is formed. It is possible to secure it reliably.

In this case, if the protrusion is provided only on one of the wide inner surfaces of the two wide inner surfaces of the air duct, the protrusion must be protruded higher from one of the wide inner surfaces. The direct contact of the wide inner surface causes a dent deformation on the other wide inner surface, so that the flow resistance of the intake air increases.

On the other hand, in the present invention, as described above, the protrusions are provided on each of the two wide inner surfaces so that the two protrusions come into contact with each other, whereby the height of each protrusion is reduced. In addition to being able to lower, this projection can be prevented from directly contacting the wide inner surface, so that the projection is
The resistance to the flow of air in the air duct can be kept to a very low level.

[Effect of the invention]

Therefore, according to the present invention, the air duct for taking in the atmospheric air or Since it is possible to avoid an increase in the outer diameter of the air duct for introducing air, the air duct can be easily disposed in a narrow space.

〔Example〕

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiment of the present invention will be described below with reference to the drawings. In the drawings, reference numeral 1 denotes a body frame of an automobile, and an internal combustion engine 3 is mounted in an engine room 2 formed at a front portion of the body frame 1. In addition, an air cleaner 4 and a radiator 5 having a fan shroud 6 on the rear surface are provided.

The air cleaner 4 and the intake manifold 7 in the internal combustion engine 3 are connected via an air introduction air duct 8 formed of rubber or synthetic resin,
The air cleaner 4 is connected to an air duct 9 for taking in atmospheric air that guides air in a space between the fender 1a and the fender apron 1b inside the fender 1a in the body frame 1 to the air cleaner 4.
The air duct 9 for taking in atmospheric air is provided in a narrow space between the fan shroud 6 on the rear surface of the radiator 5 and the hood cover 10 for the engine room 2.

And the air duct 9 for taking in the atmospheric air,
The cross section is made of rubber or synthetic resin to have a flat shape in which the height H is smaller than the width W, and both wide inner surfaces 9a and 9b of the inner surface of the air duct 9 for taking in atmospheric air are opposed to each other. Are formed integrally with each other at substantially the central portions thereof so as to abut on each other when the air duct 9 is further deformed to be flat so as to extend in the axial direction of the air duct 9.

With this configuration, when a negative pressure acts on the air duct 9 for taking in the atmospheric air, and the air duct 9 is further deformed to be flat, both of the inner surfaces of the air duct 9 that face each other are opposed to each other. Since the integrally formed projections 11 and 12 abut on the wide inner surfaces 9a and 9b, it is possible to prevent the projections 11 and 12 from being further flattened, so that the inside of the air duct 9 for taking in atmospheric air can be prevented. In addition, it is possible to secure a passage sectional area through which a sufficient amount of air required for operation of the internal combustion engine 3 can flow.

Although the above-described embodiment has shown the case where the invention is applied to the air duct 9 for taking in the atmospheric air into the air cleaner 4, the present invention is not limited to this, and the air introduction air duct 8 connecting the air cleaner 4 and the intake manifold 7 is provided. Needless to say, it can be applied to

[Brief description of the drawings]

1 shows an embodiment of the present invention, FIG. 1 is a plan view of an engine room, FIG. 2 is an enlarged sectional view taken along the line II-II of FIG.
The figure is a perspective view showing a part in an air duct for taking in atmospheric air. 1 ... body frame, 2 ... engine room, 3 ... internal combustion engine, 4 ... air cleaner, 5 ... radiator, 7 ...
... intake manifold, 8 ... air duct for air introduction, 9
…… Air duct for intake of atmospheric air, 9a, 9b …… Wide inner surface, 11,12 …… Protrusion.

Claims (1)

(57) [Scope of request for utility model registration] An air duct for taking in atmospheric air to an air cleaner or an air duct for introducing air from the air cleaner to an intake manifold is formed of rubber or synthetic resin into a flat cross-sectional shape such as a rectangle or an ellipse. In the internal combustion engine for automobiles, the inner surface of the atmospheric air intake air duct or the air introduction air duct has a substantially central portion of both wide inner surfaces opposed to each other,
An air duct for an internal combustion engine for an automobile, wherein a projection configured to extend in the axial direction of the air duct is integrally formed so that the projection comes into contact with each other when the air duct is further deformed to be flat. .