JP2838482B2 - Intake manifold - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intake manifold used for an automobile engine, for example, in which exhaust gas is returned to an intake side of the engine and recombusted.

[0002] In this specification, the term "aluminum" shall include aluminum alloys in addition to pure aluminum.

[0003]

2. Description of the Related Art As an intake manifold for an automobile, an aluminum casting plenum chamber having an intake inlet and a plurality of intake outlets, and a plurality of aluminum expansion and contraction connected to each intake outlet of the plenum chamber. There is known one provided with a material branch pipe. In such an intake manifold, a plurality of exhaust gas supply ports are formed in the plenum chamber, and the exhaust gas is exhausted from each exhaust gas supply port into the plenum chamber in order to reduce the exhaust gas to the intake side of the engine and recombust it. Gas needs to be supplied. Therefore, conventionally, an exhaust gas reduction pipe made of stainless steel, steel, or the like that returns exhaust gas extracted from the exhaust manifold to the intake manifold is branched on the way to the same number as the exhaust gas supply ports, and the tip of each branch is provided in a plenum chamber. Exhaust gas supply port.

[0004] However, a relatively large space is required for branching the exhaust gas reducing pipe in the middle and connecting the tip of each branch to the exhaust gas supply port of the plenum chamber. However, recently, it has been required to increase the size of the cabin of the automobile, and the engine room has to be reduced, so that the exhaust gas reduction pipe cannot be branched on the way as described above. Is coming. Therefore, in order to solve such a problem, an exhaust gas having one end opened to the outside and branched on the peripheral wall of the plenum chamber of the intake manifold, and the tip of the branch part opened to the internal space of the plenum chamber. The passage is formed simultaneously with the casting of the plenum chamber,
It has been considered to join an end of an exhaust gas reduction pipe to the one end of the exhaust gas passage.

[0005] However, in this case, there is a problem that it is difficult to cast the plenum chamber having the exhaust gas passage, and that the manufacturing operation of the plenum chamber and, consequently, the intake manifold is complicated. In addition, the shape of the exhaust gas passage cannot be complicated. Further, in order to form an exhaust gas passage, it is necessary to use a core made of silicon sand or the like used in the production of a sand mold, but in the case of such an exhaust gas passage, sand removal after casting is extremely difficult. is there. Therefore, there is a problem that sand remains in the exhaust gas passage, the sand passes through the intake manifold and enters the cylinder of the engine, and in the worst case, the engine is stopped. Further, since the exhaust gas passage is formed by casting the plenum chamber, the thickness of the peripheral wall of the exhaust gas passage is increased, and as a result, the weight of the plenum chamber and, consequently, the weight of the intake manifold are increased.

An object of the present invention is to provide an intake manifold which solves the above-mentioned problems.

[0007]

SUMMARY OF THE INVENTION An intake manifold according to the present invention comprises an aluminum casting plenum chamber having an intake inlet and a plurality of intake outlets, and a plurality of aluminum wrought branches connected to each intake outlet of the plenum chamber. A plurality of exhaust gas supply ports formed by machining on a peripheral wall of the plenum chamber, a projection integrally formed on an outer surface of the plenum chamber, and an exhaust gas reduced from the exhaust manifold to the projection. Is formed by machining, the exhaust gas passage is branched in the same number as the number of exhaust gas supply ports, and has one exhaust gas inlet and a plurality of exhaust gas outlets. And one end of the exhaust gas distribution pipe made of extruded aluminum material, the same number as the exhaust gas supply port, has an exhaust gas outlet in the exhaust gas passage , In which the other end is joined respectively to the exhaust gas inlet of the plenum chamber.

[0008]

A plurality of exhaust gas supply ports are formed on the peripheral wall of the plenum chamber by machining, and projections are integrally formed on the outer surface of the plenum chamber, and the through-type exhaust gas through which the exhaust gas reduced from the exhaust manifold flows is formed on the projections. The gas passage is formed by machining, and the exhaust gas passage is branched in the same number as the exhaust gas supply ports, and has one exhaust gas inlet and a plurality of exhaust gas outlets. When one end of the same number of extruded aluminum-made exhaust gas distribution pipes is connected to the exhaust gas outlet of the exhaust gas passage and the other end is connected to the exhaust gas supply port of the plenum chamber, the plenum chamber can be easily cast. Become. Further, since the exhaust gas distribution pipe is made of extruded aluminum, it can be easily bent into an arbitrary shape. Further, sand is not present in the exhaust gas supply port, the exhaust gas passage, and the exhaust gas distribution pipe made of the extruded aluminum material. Further, since the exhaust gas distribution pipe is made of extruded aluminum, the thickness of the peripheral wall can be made smaller than the thickness of the peripheral wall of the exhaust gas passage in the conventional intake manifold.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows the overall structure of the intake manifold.
2 to 6 show the configuration of the main part.

Referring to FIG. 1, an intake manifold for a vehicle is shown.
(1) one intake inlet (3) and multiple intake outlets (4)
A plenum chamber (2) made of cast aluminum having
A plurality of aluminum wrought branch pipes (5) joined by brazing to each intake outlet (4) of the plenum chamber (2);
The ends of all the branch pipes (5) are provided with a flange (6) for attaching to a cylinder head made of extruded aluminum members joined together by brazing. Each branch pipe (5) is connected to a cylinder head (not shown) of the engine via a mounting flange (6).

An outward flange (7) is integrally formed around the intake port (3) of the plenum chamber (2), and the outward flange (7) has a throttle body (not shown) with a built-in throttle valve. ) Is attached, and an air supply pipe from an air cleaner is connected to the throttle body.

The same number of through holes (8) as the number of branch pipes (5) for inserting the distal end of the branch pipe (5) and joining them by brazing or the like are formed in the flange (6) for attachment to the cylinder head. A plurality of mounting holes (9) used for mounting the mounting flange (6) to the engine cylinder head and a through hole (11) for reducing the weight are formed.

As shown in FIGS. 2 to 6, an upper bulging portion (12) is integrally formed at a portion of the upper end of the plenum chamber (2) near the outward flange (7), and a lower portion is formed at the lower end. The bulging part (13) is formed integrally. Inside each bulge (12) (13)
This space is continuous with the internal space (2a) of the plenum chamber (2). Left side of upper bulge (12) and lower bulge (13)
Exhaust gas supply ports (14) and (15) are formed by machining on the right side surface of the.

A projection 16 protruding downward is integrally formed on the outer surface of the lower end of the plenum chamber 2. Projection (16)
Further, a through exhaust gas passage (17) through which exhaust gas reduced from the exhaust manifold flows is formed by machining. The exhaust gas passage (17) has a bottomed vertical portion (17a) extending upward from the lower end face of the projection (16) and an intermediate portion at the height of the vertical portion (17a). ), Here two horizontal portions (17b) (17c) that are branched into two and whose leading ends are open on the right and left sides of the projection (16), respectively. The lower end opening of the vertical portion (17a) serves as an exhaust gas inlet (18), and the leading end openings of the horizontal portions (17b) (17c) serve as exhaust gas outlets (19) and (21).

The same number of exhaust gas supply ports (14) and (15), here two exhaust gas distribution pipes (22) and (23) made of extruded aluminum material
Is connected to the exhaust gas outlets (19) and (21) of the exhaust gas passage (17) by brazing, welding, etc., and the other end is connected to the exhaust gas supply ports (14) and (15) of the plenum chamber (2). They are joined by brazing, welding or the like.

In such a configuration, the exhaust gas passage (1
At the exhaust gas inlet (18) of 7), the tip of an exhaust gas reduction pipe made of stainless steel or steel extending from an exhaust manifold (not shown) is joined by brazing, welding, or the like. The exhaust gas sent into the exhaust gas passage (17) by the gas reduction pipe passes through the exhaust gas passage (17) and the exhaust gas distribution pipes (22) and (23) made of extruded aluminum material and the exhaust gas supply port (14). ) (15) into the internal space (2a) of the plenum chamber (2).

In the above, when the joining of the exhaust gas distribution pipes (22) and (23) to the exhaust gas outlets (19) and (21) and the exhaust gas supply ports (14) and (15) is performed by brazing, Brazing is performed by branch pipe (5) and plenum chamber (2), and branch pipe.
This is performed simultaneously with the brazing of (5) and the mounting flange (6).

In the above embodiment, the plenum chamber
The number of the exhaust gas supply ports (14) and (15) in (2) is two, and accordingly, the branched horizontal portions (17b) (17)
c) and the number of exhaust gas distribution pipes (22) and (23) are also two, but these numbers may be three or more. Further, in the above embodiment, the exhaust gas inlet (1
8) is formed on the lower end face of the projection (16), and the exhaust gas outlets (19) (2)
1) is formed on the peripheral surface of the projection (16), but the exhaust gas inlet
(18) and the formation positions of the exhaust gas outlets (19) and (21) are not limited to those described above.

[0020]

According to the intake manifold of the present invention, as described above, since the casting of the plenum chamber is facilitated, the operation of manufacturing the plenum chamber is simplified. In addition, since the exhaust gas distribution pipe can be easily bent into an arbitrary shape, the shape of the exhaust gas distribution pipe can be made complicated, and the production becomes simple even if the shape is complicated. In addition, since sand is not present in the exhaust gas supply port, the exhaust gas passage, and the exhaust gas distribution pipe made of extruded aluminum material, the sand passes through the intake manifold, enters the cylinder of the engine, and stops the engine. Can be prevented. Further, since the thickness of the peripheral wall of the exhaust gas distribution pipe can be made smaller than the thickness of the peripheral wall of the exhaust gas passage in the conventional intake manifold, the weight of the plenum chamber and, consequently, the weight of the intake manifold can be reduced. Can also be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view showing the overall configuration of an intake manifold according to the present invention.

FIG. 2 is a plan view of a portion of the plenum chamber of the intake manifold.

FIG. 3 is a side view of a portion of the plenum chamber of the intake manifold.

FIG. 4 is a bottom view of a portion of the plenum chamber of the intake manifold.

FIG. 5 is a sectional view taken along line VV of FIG. 3;

FIG. 6 is an enlarged sectional view taken along line VI-VI of FIG. 3;

[Explanation of symbols]

 (1) Suction manifold (2) Plenum chamber (3) Suction inlet (4) Suction outlet (5) Branch pipe (14) Exhaust gas supply port (15) Exhaust gas supply port (16) Projection (17) Exhaust gas passage ( 18) Exhaust gas inlet (19) Exhaust gas outlet (21) Exhaust gas outlet (22) Exhaust gas distribution pipe (23) Exhaust gas distribution pipe

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F02M 35/10 F02M 35/104

Claims (1)

(57) [Claims] 1. An intake manifold comprising: an aluminum casting plenum chamber having an intake inlet and a plurality of intake outlets; and a plurality of aluminum wrought branch pipes connected to each intake outlet of the plenum chamber. A plurality of exhaust gas supply ports are formed on the peripheral wall of the plenum by machining, a projection is integrally formed on the outer surface of the plenum chamber, and a through exhaust gas passage through which exhaust gas reduced from the exhaust manifold flows is machined on the projection. The exhaust gas passage is branched in the middle thereof in the same number as the exhaust gas supply ports, is provided with one exhaust gas inlet and a plurality of exhaust gas outlets, and has the same number of aluminum extrusions as the exhaust gas supply ports. One end of the profiled exhaust gas distribution pipe is located at the exhaust gas outlet of the exhaust gas passage, and the other end is located at the exhaust gas supply port of the plenum chamber. Intake manifold is joined Re respectively.