JPH10213026A - Intake manifold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten the length of a cylindrical projected part for connecting a branch pipe in comparison with the conventional case, and as a result, lighten a mounting flange. SOLUTION: This manifold 1 is formed in a manner that it is equipped with an aluminum-made plenum chamber 4 having an intake inlet 2 and a plurality of intake outlets 3, mounting flanges 6 to aluminum casting-made cylinder heads, which have a plurality of intake air passing openings 5, and also in which cylindrical projected parts 8 are formed around the intake air passing openings 5, and a plurality of aluminum extended material-made branch pipes 7 whose one end is connected to each intake outlet 3 of the plenum chamber 4, and also whose other end is connected to each intake air passing opening 5 of each mounting flange 6 under a condition that it is inserted in each cylindrical projected part 8. In this case, the shapes of the intake air passing openings 5 of the mounting flanges 6, the cross sectional shapes of the cylindrical projected parts 8 and openings of connection side end parts in the branch pipes 7, to the intake passing openings 5 of the mounting flanges 6, are respectively formed into an oblong shape which is long in the direction of the length of the mounting flanges 6. The cylindrical projected parts 8 are formed into a straight cylindrical shape.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an intake manifold used for, for example, an automobile engine.

[0002] In this specification, the term "aluminum" shall include aluminum alloys in addition to pure aluminum. Further, in this specification, the term “elliptical shape” is not limited to the shape shown in the figure, but may be various shapes in which the length in one direction such as an elliptical shape is longer than the length in the direction orthogonal thereto. Shall be included.

[0003]

2. Description of the Related Art As an intake manifold used in an automobile engine, an aluminum plenum chamber having an intake inlet and a plurality of intake outlets, a plurality of intake passages, and each intake passage is provided. A flange for attachment to an aluminum casting cylinder head having a cylindrical protrusion formed around the periphery, and one end connected to the intake outlet of the plenum chamber and the other end inserted into the cylindrical protrusion A plurality of branch pipes made of wrought aluminum are connected to the intake passage of the mounting flange, and each branch pipe has a circular cross-section and the inner and outer diameters thereof are equal over the entire length. (See Japanese Patent Publication No. 7-45853).

By the way, in the case of an automobile engine in which two intake ports are formed for each cylinder and intake valves are respectively mounted on both intake ports, both intake ports of one cylinder extend from each branch pipe of the intake manifold. Since the intake air must be supplied to the intake flange, the intake passage needs to be formed in an oval shape that is long in the length direction of the mounting flange.

Therefore, in the conventional intake manifold, each branch pipe has a circular cross section and the inner and outer diameters thereof are equal over the entire length. It was deformed from circular to oval. However, in order to deform the cross-sectional shape of the cylindrical projection in this manner, it is necessary to prevent a sudden increase in the ventilation resistance, and it is necessary to make the length of the cylindrical projection relatively long. There has been a problem that the weight of the flange, and hence the weight of the intake manifold, increases, which adversely affects the performance of the vehicle.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problem and to reduce the length of a cylindrical projecting portion for connecting a branch pipe as compared with a conventional one, thereby reducing the weight of a mounting flange. The manifold is to provide.

[0007]

An intake manifold according to the present invention includes an aluminum plenum chamber having an intake inlet and a plurality of intake outlets, a plurality of intake passages, and a cylindrical projection formed around each intake passage. A flange for attachment to a cylinder head made of cast aluminum having an opening, and an intake passage for the attachment flange with one end connected to the intake outlet of the plenum chamber and the other end inserted into the cylindrical projection. In the intake manifold having a plurality of wrought aluminum branch pipes connected to the pipe, the shape of the intake passage of the mounting flange, the cross-sectional shape of the cylindrical projection, and the suction of the mounting flange in the branch pipe The shape of the opening on the connection side end to the passage opening is an oval shape that is long in the length direction of the mounting flange, and the cylindrical protrusion is straight It is what is made cylindrical.

According to the intake manifold of the present invention, the shape of the intake passage of the mounting flange, the cross-sectional shape of the cylindrical projection, and the opening at the end of the branch pipe on the connection side to the intake passage of the mounting flange. Since the shape of each of the mounting flanges is an elliptical shape that is long in the length direction of the mounting flange, two intake ports are formed for each cylinder, and an intake valve is mounted on each of the intake ports. In this case as well, intake air can be supplied from each branch pipe of the intake manifold to both intake ports of one cylinder.

Further, since the cylindrical projecting portion is formed in a straight cylindrical shape, the cross-sectional shape of the cylindrical projecting portion is gradually changed from circular to elliptical from the distal end to the proximal end as in a conventional intake manifold. The length of the cylindrical protruding portion can be reduced as compared with the case of deforming to have a shape. Therefore, the weight of the mounting flange, and thus the weight of the entire intake manifold, can be reduced as compared with the conventional intake manifold, and the performance of the automobile can be improved.

Further, in order to make the shape of the opening at the connection side of the mounting flange to the intake passage in the branch pipe into an elliptical shape that is long in the length direction of the mounting flange, a branch having a generally circular cross section is used. Since the cross-sectional shape of the predetermined length portion near the end of the pipe may be gradually deformed, it is possible to prevent a sudden increase in the ventilation resistance at this portion.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described.
This will be described with reference to the drawings. In the following description,
The left and right sides of each drawing are referred to as left and right, and the front side of FIG. 2 is referred to as front, and the opposite side is referred to as rear.

1 to 3, an intake manifold (1)
A plenum chamber (4) made of cast aluminum with an inlet (2) and a plurality of inlets (3);
A flange (6) for mounting to an aluminum cast cylinder head having the same number of intake passages (5) as (3), and one end connected to the intake outlet (3) of the plenum chamber (4) and the other end Has a plurality of aluminum wrought branch pipes (7) connected to the intake passage (5) of the mounting flange (6).

The plenum chamber (4) has a substantially rectangular parallelepiped shape that is long in the left-right direction, and has an intake port (2) formed at the center of the lower wall in the longitudinal direction. A throttle body (not shown) is connected to the intake port (2), and an air supply pipe from an air cleaner (not shown) is connected to the throttle body. The intake outlet (3) is formed in the front wall of the plenum chamber (4) at intervals in the longitudinal direction. The intake outlet (3) has an elliptical shape that is long in the direction perpendicular to the length direction of the plenum chamber (4), that is, in the vertical direction.

The flange (6) for attachment to the cylinder head is a long plate in the left-right direction, and a plurality of intake passages (5) are formed at intervals in the length direction. Intake passage
(5) has an oval shape that is long in the length direction of the mounting flange (6), that is, in the left-right direction. Around the intake passage (5), a branch pipe connecting cylindrical projection (8) having an oblong cross section is integrally provided. The cylindrical projection (8) is a straight cylinder,
An expanded portion (8a) is formed at the tip.

The branch pipe (7) has a circular cross section, and its connection-side end opening to the intake outlet (3) side of the plenum chamber (4) has:
It has an oval shape that is long in the vertical direction according to the shape of the intake outlet (3). Also, the flange for mounting the branch pipe (7)
The opening at the end on the connection side to the intake passage (5) of (6) has an oval shape that is long in the left-right direction in accordance with the intake passage (5). Then, predetermined length portions (7A) (7B) at both ends of the branch pipe (7)
Is gradually deformed so that its cross-sectional shape changes from circular to elliptical. Then, the end of the branch pipe (7) on the plenum chamber (4) side is inserted into the intake outlet (3) and brazed to the plenum chamber (4), and the end of the mounting flange (6) is expanded. It is inserted into the portion (8a) and brazed to the cylindrical outward projection (8).

In the above, the plenum chamber (4) has an intake outlet (3) and a branch pipe (7) has a plenum chamber.
Since the opening at the connection side to the intake outlet (3) of (4) is formed in an oval shape that is long in the vertical direction, there is no problem in the case where the openings of the intake outlet and the branch pipe are circular. Can be prevented. That is, to connect the branch pipe to the intake outlet of the plenum chamber, all the intake outlets (3)
It is necessary to set the interval in the longitudinal direction between adjacent ones of the plenum chambers to a predetermined length, for example, at least about 10 mm. Is circular, the length of the plenum chamber is necessarily longer. Therefore, there is a problem that it is difficult to prevent interference with other parts in the layout of the engine. Moreover, as the length of the plenum chamber increases,
There is a problem that the weight of the intake manifold, and hence the weight of the entire intake manifold, increases, which adversely affects the performance of the vehicle. However, the openings on the connection side to the intake outlet (3) of the plenum chamber (4) and the intake outlet (3) of the plenum chamber (4) in the branch pipe (7) are oval shapes that are long in the vertical direction. When the plenum chambers (4) between adjacent ones of all the intake outlets (3) are spaced at the same length in the longitudinal direction, the intake manifold having the circular openings in the intake outlets and branch pipes is the same. In addition, the overall length of the plenum chamber (4) can be reduced as compared to the intake manifold. Therefore, it is easy to avoid interference with other parts in the layout of the engine. Moreover, the weight of the plenum chamber (4), and hence the weight of the entire intake manifold, can be reduced, and the performance of the vehicle can be improved.

In the intake manifold (1) having the above structure, the shape of the intake passage (5) of the mounting flange (6), the cylindrical protrusion,
The cross-sectional shape of (8) and the shape of the opening at the connection side end of the mounting flange (6) of the branch pipe (7) to the intake passage (5) are formed into long oval shapes in the left-right direction. Yes,
Since the cylindrical projection (8) is formed as a straight cylinder, the cross-sectional shape of the cylindrical projection gradually changes from circular to elliptical from the tip to the base like a conventional intake manifold. Thus, the length of the cylindrical projecting portion can be reduced as compared with the case where the cylindrical projection is deformed. Therefore, the mounting flange
(6) The weight of the intake manifold (1), and thus the weight of the entire intake manifold (1), can be reduced as compared with the conventional intake manifold, and the performance of the vehicle can be improved. In addition, in order to make the shape of the opening on the connection side end of the mounting flange (6) of the branch pipe (7) to the intake passage (5) into an oval shape that is long in the left-right direction, the cross-section is usually circular. Since the cross-sectional shape of the predetermined length portion (7B) near the end of the branch pipe (7) may be gradually deformed, it is possible to prevent a sudden increase in the ventilation resistance at this portion.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing an embodiment of an intake manifold according to the present invention.

FIG. 2 is a partially cutaway sectional view taken along line II-II of FIG.

FIG. 3 is a sectional view taken along line III-III of FIG. 1;

[Explanation of symbols]

 (1): Intake manifold (2): Intake inlet (3): Intake outlet (4): Plenum chamber (5): Intake passage (6): Flange for mounting to cylinder head (7): Branch pipe

Claims (1)

[Claims] 1. An aluminum plenum chamber having an intake inlet and a plurality of intake outlets, and a cylinder head made of an aluminum casting having a plurality of intake passages and having a cylindrical protrusion formed around each intake passage. And a plurality of aluminum wrought products connected to the suction passage of the mounting flange with one end connected to the suction outlet of the plenum chamber and the other end inserted into the cylindrical projection. In the intake manifold provided with a branch pipe, the shape of the intake passage of the mounting flange, the cross-sectional shape of the cylindrical projection, and the shape of the opening at the connection side end of the mounting flange to the intake passage in the branch pipe However, each of the intake manifolds has an elliptical shape that is long in the length direction of the mounting flange, and has a straight cylindrical protrusion.