JPH08261082A - Intake manifold - Google Patents

Abstract

PURPOSE: To prevent the reduction of engine performance and prevent the reduction of strength of a whole intake manifold when wall thickness of branched pipes is made thin. CONSTITUTION: It is an intake manifold provided with a plenum chamber which is made of aluminum and has an intake inlet and a plurality of intake outlets and a plurality of branched pipes 4 which are made of flattened aluminum material and are connected to each intake outlet of the plenum chamber. An exhaust gas distributing pipe 13 which is provided with an exhaust gas inlet at one end and is made of extruded shape aluminum is arranged in such a manner that it crosses all the branched pipes 4. A plurality of exhaust gas outlets 15 are formed at intervals in the direction of length in the exhaust gas distributing pipe 13, and an exhaust gas supply port 16 is formed in each branched pipe 4. The exhaust gas distributing pipe 13 is joined with each branched pipe 4 so that each exhaust gas outlet 15 of the exhaust gas distributing pipe 13 communicates with the exhaust gas supply port 16 of each branched pipe A. A stay section 21 which protrudes to a side and exists between adjacent branched pipes 4 is formed integrally on a peripheral wall of the exhaust gas distributing pipe 13. The stay section 21 is joined with each branched pipe 4.

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 in an automobile engine designed to reduce exhaust gas to the intake side of the engine and reburn it.

In this specification, the term "aluminum" includes aluminum alloy in addition to pure aluminum.

[0003]

2. Description of the Related Art An intake manifold for an automobile is provided with an aluminum plenum chamber having an intake inlet and a plurality of intake outlets, and a plurality of aluminum wrought material branch pipes connected to each intake outlet of the plenum chamber. Things are known. In such an intake manifold, in order to reduce the exhaust gas to the intake side of the engine and re-combust it, conventionally, an exhaust gas supply port is formed in a portion of the plenum chamber on the intake inlet side so as to communicate with the inside thereof. An exhaust gas reduction pipe was connected to this exhaust gas supply port. Then, the reduced exhaust gas once enters the plenum chamber, is then distributed to each branch pipe together with the new mixed gas, and is supplied to each cylinder of the engine.

[0004]

However, in the conventional intake manifold, since the reduced exhaust gas once enters the plenum chamber and is then distributed, the ratio of the exhaust gas in the new mixed gas is different for each cylinder. There was a problem that it varied from time to time and adversely affected the performance of the engine. Further, the wall thickness of the peripheral wall of each branch pipe is thin to reduce the weight, and as a result, there has been a problem that the strength of each branch pipe, and eventually the intake manifold, is reduced. An object of the present invention is to provide an intake manifold that solves the above problems.

[0005]

An intake manifold according to the present invention comprises an aluminum plenum chamber having an intake inlet and a plurality of intake outlets, and a plurality of aluminum wrought material branch pipes connected to the intake outlets of the plenum chamber. In the intake manifold equipped with, the exhaust gas distribution pipe made of extruded aluminum with an exhaust gas inlet provided at one end is arranged so as to intersect with all branch pipes, and the exhaust gas distribution pipe has a longitudinal direction. A plurality of exhaust gas outlets are formed at intervals, and an exhaust gas supply port is formed in each branch pipe so that each exhaust gas outlet of the exhaust gas distribution pipe communicates with the exhaust gas supply port of each branch pipe. An exhaust gas distribution pipe is joined to each branch pipe, and a stay portion that projects laterally and is present between adjacent branch pipes is integrally formed on the peripheral wall of the exhaust gas distribution pipe. It is one in which the stay portion and the branch pipes are joined.

[0006]

[Operation] The exhaust gas distribution pipe made of aluminum extruded profile, which is provided with the exhaust gas inlet at one end, is arranged so as to intersect with all the branch pipes, and the exhaust gas distribution pipe is spaced in the longitudinal direction. A plurality of exhaust gas outlets are formed and an exhaust gas supply port is formed in each branch pipe, and the exhaust gas distribution pipe is connected so that each exhaust gas outlet of the exhaust gas distribution pipe communicates with the exhaust gas supply port of each branch pipe. When joined to each branch pipe, the reduced exhaust gas directly enters the branch pipe, so that the proportion of the exhaust gas in the new mixed gas is prevented from varying from cylinder to cylinder. Also, on the peripheral wall of the exhaust gas distribution pipe,
When the stay portion that projects laterally and is present between adjacent branch pipes is integrally formed and the stay portion and each branch pipe are joined, the stay portion reinforces each branch pipe.

[0007]

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

FIG. 1 shows the overall construction of the intake manifold according to the present invention, and FIGS. 2 and 3 show the construction of the essential parts of the garden.

In FIG. 1, the intake manifold includes an aluminum plenum chamber (1) having one intake inlet (2) and a plurality of intake outlets (3), and an plenum chamber.
Branch pipes (4) made of wrought aluminum with one end joined by brazing to each intake outlet (3) of (1) and all branch pipes
The other end of (4) is equipped with a flange (5) for mounting on a cylinder head made of cast aluminum that is joined together by brazing, and the other end of each branch pipe (4) is a mounting flange.
It is connected via (5) to the cylinder head of the engine (not shown).

The plenum chamber (1) is joined by brazing to the open end of the chamber body (6) and a straight tubular aluminum wrought material chamber body (6) with one end closed and the other end open. And a throttle body mounting tubular member (7) made of cast aluminum. Chamber body
A plurality of intake outlets (3) are formed on the peripheral wall of (6), and a cylindrical outward projection for connecting a branch pipe is provided around each intake outlet (3).
(8) is formed integrally, and one end of each branch pipe (4) is fitted into the cylindrical outer protrusion (8) and joined to the cylindrical outer protrusion (8) by brazing. ing. A flange (9) is integrally formed on one end of the throttle body mounting tubular member (7), and the end of the flange (9) is brazed to the end of the flange (5) for mounting on the cylinder head. Are joined by. This improves the rigidity of the intake manifold as a whole. A throttle body (not shown) having a built-in throttle valve is attached to the tubular body (7) for attaching the throttle body, and an air supply pipe from an air cleaner is connected to the throttle body.

An upward projecting portion (7a) is integrally formed at the upper end of the throttle body mounting tubular member (7) of the plenum chamber (1). An exhaust gas passageway (11) is formed in the upper projecting portion (7a), one end of which is open at the upper end surface and the other end of which is open at the peripheral surface. A coupling member (12) for connecting an exhaust gas reduction pipe (not shown) is connected to the opening on the upper end surface side of the upper protruding portion (7a) of the exhaust gas passage (11).

[0012] An exhaust gas distribution pipe (13) made of aluminum extruded profile, which is provided with an exhaust gas inlet (14) at one end and closed at the other end, is arranged so as to intersect with all the branch pipes (4). ing. The inlet-side end of the exhaust gas distribution pipe (13) is bent, and its tip is connected to the peripheral surface side opening of the upward protrusion (7a) of the exhaust gas passage (11).

As shown in FIGS. 2 and 3, a plurality of exhaust gas outlets (15) are formed at a portion of the exhaust gas distribution pipe (13) intersecting each branch pipe (4), and each branch pipe (4) is formed. Exhaust gas distribution pipe
An exhaust gas supply port (16) is formed at a portion intersecting with (13).

On the peripheral wall of the exhaust gas distribution pipe (13), this pipe (13)
A side projecting wall (17) is integrally formed that extends from the closed end side to the bent portion and projects toward the branch pipe (4) side.
In the parts corresponding to each branch pipe (4) in
An arcuate notch (18) into which a part of (4) fits is formed. A rectangular protrusion (19) is integrally formed on the bottom of each notch (18), and an exhaust gas outlet (15) is formed from the tip surface of the protrusion (19). In addition, the branch pipes adjacent to the side projecting wall (17)
(4) The portions existing between the branch pipes (4) between and at both ends are stay portions (21). And
A part of the branch pipe (4) is fitted in the notch (18), and the protrusion (19) is provided in the exhaust gas supply port (16) of each branch pipe (4).
The inner peripheral surface of the notch (18), that is, the end of the stay portion (21) is joined to the branch pipe (4) by brazing and the outer peripheral surface of the protrusion (19) Are joined to the inner peripheral surface of the exhaust gas supply port (16) by brazing. Thus, the exhaust gas distribution pipe (13) is connected to the branch pipe (4) so that the exhaust gas outlet (15) of the exhaust gas distribution pipe (13) communicates with the exhaust gas supply port (16) of the branch pipe (4). ) Is joined to.

The exhaust gas distribution pipe (13) as described above is manufactured as follows. That is, the side wall protruding to the peripheral wall
(17) After forming an aluminum extruded profile pipe integrally formed over the entire length, one end thereof is closed.
Then, a predetermined length portion of the side projecting wall (17) on the pipe opening side is cut off, and an arcuate notch (18) and a projection (19) are formed on the side projecting wall (17) at intervals in the longitudinal direction. ) Is formed. Then, the opening end side portion of the pipe is bent.
Thus, the exhaust gas distribution pipe (13) is manufactured.

In the above, the stay portion (21) of the exhaust gas distribution pipe (13) may be formed with a screw hole or the like. In this case, the intake manifold can be attached to the engine using the stay portion (21).

[0017]

As described above, according to the intake manifold of the present invention, the proportion of the exhaust gas in the novel mixed gas is prevented from varying from cylinder to cylinder, so that the engine performance is prevented from being deteriorated. You can Further, since the stay portion reinforces each branch pipe, even if the thickness of the branch pipe is thin, it is possible to prevent the strength of the entire intake manifold from being lowered.

[Brief description of drawings]

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

FIG. 2 is an enlarged sectional view taken along line II-II in FIG.

FIG. 3 is an exploded perspective view showing an enlarged joint portion between a branch pipe and an exhaust gas distribution pipe.

[Explanation of symbols]

 (1) Plenum chamber (2) Inlet inlet (3) Inlet outlet (4) Branch pipe (13) Exhaust gas distribution pipe (14) Exhaust gas inlet (15) Exhaust gas outlet (16) Exhaust gas supply port (21) Stay Department

Claims (1)

[Claims] 1. An intake manifold comprising an aluminum plenum chamber having an intake inlet and a plurality of intake outlets, and a plurality of aluminum wrought material branch pipes connected to the respective intake outlets of the plenum chamber. The exhaust gas distribution pipe made of extruded aluminum with a gas inlet is arranged so as to intersect with all the branch pipes, and there are multiple exhaust gas outlets at intervals in the length direction in the exhaust gas distribution pipe. The exhaust gas distribution port is formed in each branch pipe as well as formed, and the exhaust gas distribution pipe is joined to each branch pipe so that each exhaust gas outlet of the exhaust gas distribution pipe communicates with the exhaust gas supply port of each branch pipe. An intake pipe in which a stay portion projecting laterally and existing between adjacent branch pipes is integrally formed on the peripheral wall of the exhaust gas distribution pipe, and the stay portion and each branch pipe are joined Nihorudo.