JPH0528376Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an intake air introduction device for guiding intake air from an air cleaner to an intake manifold in an internal combustion engine.

[Conventional technology and its problems]

The air cleaner in a fuel-injected internal combustion engine installed in a car is not attached to the internal combustion engine like in a carburetor-type internal combustion engine, but is attached to the body frame of the car, so there is no space between the air cleaner and the intake manifold. In order to absorb dimensional differences and vibration differences between the two, a rubber bellows-shaped intake conduit is used to connect the two (for example, Japanese Utility Model Application Publication No. 17471/1983).

In this case, conventionally, the rubber bellows-shaped intake conduit that connects the air cleaner and the intake manifold is a tapered pipe in which the diameter of the connection part to the air cleaner side is larger than the diameter of the connection part to the intake manifold side. By forming the intake conduit in a manner similar to the above, the flow resistance within the intake conduit is reduced.

However, if the diameter of the connection part of the intake duct to the air cleaner side is increased, the overall height of the internal combustion engine will increase accordingly, so there is a certain limit to the reduction in intake flow velocity by increasing the diameter of the connection part of the intake duct to the air cleaner side, in other words, the reduction in intake resistance by increasing the diameter of the connection part.

In addition, there is a limit to increasing the diameter of the intake pipe due to the relationship with the overall height of the internal combustion engine as described above, and the flow velocity within the intake pipe cannot be sufficiently reduced. On the other hand, when sucking and treating blow-by gas generated in the cylinder head cover or crankcase of an internal combustion engine, the flow speed of intake air in the intake pipe is high, so it is difficult to suck in excessive blow-by gas. Therefore, this caused the problem of inhibiting combustion.

This invention solves these problems and also
It is an object of the present invention to provide an intake air introduction device which is designed to reduce cost and space in an intake conduit, and to improve durability in a blow-by gas extraction conduit.

[Means for solving problems]

To achieve this object, the present invention provides an air intake introduction device in which an air cleaner and an intake inlet of an intake manifold attached to one longitudinal side of an internal combustion engine are connected by a bellows-shaped intake conduit made of rubber. The air cleaner is disposed at a position substantially right beside the internal combustion engine at one end in the longitudinal direction of the internal combustion engine when viewed from above, and the intake conduit is arranged in a substantially straight line from the air cleaner toward the intake inlet of the intake manifold. Further, the cross section of the connection part of the intake conduit to the air cleaner is formed into an ellipse or an oval with a short axis in the vertical direction and a long axis in the lateral direction. The gas extraction conduit is arranged to extend along the longitudinal direction of the internal combustion engine, and its tip is connected to the connection part of the intake conduit having an oval or oblong cross section.

[Functions and effects of the idea]

If the cross-section of the rubber bellows-shaped intake conduit to the air cleaner is formed into an ellipse or an oval shape with the short axis in the vertical direction and the long axis in the horizontal direction, the cross-sectional area at the connection part will be the same as that of the internal combustion engine. This can be increased without increasing the overall height, in other words the flow velocity of the intake air in the connection of the intake conduit to the air cleaner can be made sufficiently low without increasing the overall height of the internal combustion engine.

Therefore, the flow resistance of intake air in the intake pipe can be significantly reduced, and the output of the internal combustion engine can be improved. On the other hand, when blow-by gas is drawn into the intake pipe, excessive blow-by gas is not drawn in. , it is possible to reliably avoid inhibiting combustion due to excessive suction of blow-by gas.

Moreover, the air cleaner is disposed at a position substantially right beside the internal combustion engine at one longitudinal end of the internal combustion engine in a plan view, and the air cleaner and the intake inlet of an intake manifold attached to one longitudinal side of the internal combustion engine are provided. By configuring the intake conduit that connects the intake conduit to extend substantially in a straight line, the length dimension of the rubber bellows-like intake conduit is shortened, which makes it possible to reduce costs and to arrange the intake conduit. In particular, the space required can be reduced.

On the other hand, an internal combustion engine vibrates greatly in the direction perpendicular to the crankshaft, but the vibration in the longitudinal direction parallel to the crankshaft is much smaller than the vibration in the direction perpendicular to the crankshaft. An air cleaner is disposed at a position substantially right beside the internal combustion engine at one longitudinal end thereof in plan view, and a blow-by gas extraction pipe is connected from the cylinder head of the internal combustion engine to the connection part of the intake conduit to the air cleaner. By arranging the pipe so as to extend along the longitudinal direction of the internal combustion engine, the influence of vibrations in the internal combustion engine on the blow-by gas extraction pipe can be reduced, and damage to the blow-by gas extraction pipe can be reduced. , durability can be improved.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 indicates a multi-cylinder internal combustion engine comprising a first cylinder A1, a second cylinder A2, and a third cylinder A3, and the internal combustion engine 1 includes: In the engine room (not shown) of an automobile, the crank axis 1
The vehicle is mounted horizontally so that a is approximately perpendicular to the direction of travel of the vehicle.

Reference numeral 2 indicates an inertia supercharging type intake manifold attached to one longitudinal side of the internal combustion engine 1;
A chamber 3 extending parallel to the crank axis 1a, and a chamber 3 and each cylinder A1, A2,
The intake port 10 formed at one end of the chamber 3 has a throttle valve. 12 is connected to the throttle body 11.

Further, reference numeral 13 indicates an air cleaner disposed at a portion substantially right beside the internal combustion engine 1 at one end in the longitudinal direction in a plan view so as to be attached to the body frame (not shown) of the automobile. An intake outlet 15 is provided on the side surface of the clean side chamber 14 in the air cleaner 13.

Furthermore, reference numeral 16 indicates the connection 1 at one end.
6a is the intake outlet 1 of the air cleaner 13.
5 shows a rubber bellows-shaped intake conduit whose connecting portion 16b at the other end is removably fitted and connected to the throttle body 11, and this intake conduit 16
is the intake outlet 15 in the air cleaner 13
The intake manifold 2 is arranged to extend substantially in a straight line toward the throttle body 11 in the intake manifold 2.

The cross section of the connecting portion 16a at one end of the intake conduit 16 and the intake outlet 15 into which the connecting portion 16a is fitted has a short axis d in the vertical direction and a major axis D in the horizontal direction, as shown in FIG. The blow-by gas extraction pipe 17 from the cylinder head cover 1b of the internal combustion engine 1 is arranged to extend along the longitudinal direction of the internal combustion engine 1, so that the blow-by gas can be extracted. A conduit 17 is connected to a connection 16a at one end of the intake conduit 16.

In this way, the cross section of the connection part 16a of the intake pipe 16 to the air cleaner 13 is shown with the short diameter d in the vertical direction.
By forming the connecting portion 16a into an ellipse or an oblong shape with the major axis D in the lateral direction, the cross-sectional area of the connecting portion 16a can be increased without increasing the overall height of the internal combustion engine.In other words, the connecting portion 16a of the intake conduit 16 to the air cleaner 13 can be increased. Since the flow velocity of the intake air inside the internal combustion engine can be made sufficiently slow without increasing the overall height of the internal combustion engine, the flow resistance of the intake air inside the intake pipe 16 can be reduced, and the flow speed of the intake air inside the intake pipe 16 can be reduced.
On the other hand, excessive suction of blowby gas from the blowby gas extraction pipe 17 can be prevented.

Note that in a plan view of the internal combustion engine 1, the longitudinal axis 3a of the chamber 3 and the intake outlet 15
The axis 15 is parallel or substantially parallel to the crank axis 1a, but the axis 16c of the intake conduit 16 and the throttle body 11 is inclined with respect to the longitudinal axis 3a of the chamber 3 and the axis 15a of the intake outlet 15. It is configured. In addition, the cylinder head cover 1 of the internal combustion engine 1
The blow-by gas extracted from the cap 1 d to the oil filler 1 c in the small-diameter blow-by gas extraction pipe 18 in b is configured to be introduced into the chamber 3.

Furthermore, the inner wall surface 3 of the chamber 3
b, the intake air flowing into the chamber 3 in the direction of arrow A is directed into the chamber 3 as shown by arrow B.
An arcuate guide surface 3c is provided to deflect the object to the center.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a partially cutaway plan view, FIG. 2 is a cross-sectional view from the side of FIG. 1, FIG. FIG. 2 is an enlarged sectional view taken from - in FIG. 1; 1...Internal combustion engine, 2...Intake manifold, 3
...Chamber, 7, 8, 9...Intake passage, 11
...Throttle body, 13...Air cleaner,
14...Cleaner side chamber, 15...Intake outlet,
16...Intake conduit, 17...Blow-by gas extraction conduit.

Claims (1)

[Scope of utility model registration request] In an intake air introduction device in which an air cleaner and an intake inlet of an intake manifold attached to one longitudinal side of an internal combustion engine are connected by a rubber bellows-shaped intake conduit, the air cleaner is connected to the internal combustion engine in a plan view. On the other hand, it is disposed at a position approximately right next to one end in the longitudinal direction,
The intake conduit is arranged to extend in a substantially straight line from the air cleaner toward the intake inlet of the intake manifold, and further, the cross section of the connection part of the intake conduit to the air cleaner is arranged in a horizontal direction with the minor axis in the vertical direction. The blow-by gas extraction pipe from the cylinder head of the internal combustion engine is arranged to extend along the longitudinal direction of the internal combustion engine, and its tip is connected to the intake pipe. An intake air introduction device for an internal combustion engine, characterized in that it is connected to a connecting portion having an elliptical or oblong cross section.