JP2838490B2 - 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.

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

[0003]

2. Description of the Related Art Conventionally, as an intake manifold used for an automobile engine, a plenum chamber having an intake inlet and a plurality of intake outlets, and a plurality of aluminum wrought materials each having one end connected to each intake outlet of the plenum chamber. There is known an intake manifold having a branch pipe, the other end of which is connected to a cylinder head of an engine (see JP-A-63-101080).

[0004]

However, in the conventional intake manifold, when sound is generated in the combustion chamber of the engine, the branch pipe made of aluminum wrought material resonates, thereby generating loud noise and leaking to the outside. There is a problem.

[0005] An object of the present invention is to provide an intake manifold that solves the above problems.

[0006]

SUMMARY OF THE INVENTION An intake manifold according to the present invention comprises a plenum chamber having an intake inlet and a plurality of intake outlets, and a plurality of branch pipes having one end connected to each intake outlet of the plenum chamber. In the intake manifold in which the other end of the branch pipe is connected to the cylinder head of the engine, a portion of each branch pipe on the cylinder head side is formed of a branch pipe component member made of aluminum casting , and the side of the plenum chamber is formed. Part is al
It is formed by Miniumu wrought steel branch pipe component, A
Plenum chamber side of the branch pipe component made of aluminum casting
The ends are interconnected by an integrally cast connection.
It is embodied .

In the above-mentioned intake manifold, each branch pipe is
Aluminum casting branch pipe components and aluminum exhibition
It is preferable that the branch pipe component made of a stretched material is brazed .

[0008]

[Action] The cylinder head side of each branch pipe is made of aluminum.
A branch pipe made of aluminum casting, and a part on the plenum chamber side is made of an aluminum wrought material.
If it is made of a component, even if noise is generated in the combustion chamber of the engine, the aluminum
The branch pipe components do not resonate, but rather attenuate the sound.

Structure of aluminum cast branch pipe for each branch pipe
When the member and the aluminum wrought branch pipe constituent member are brazed, the number of parts is reduced and the operation of manufacturing the intake manifold is simplified. For example, if the part formed of aluminum casting and the part formed of aluminum wrought material of each branch pipe are connected by bolts, nuts, and the like via a sealing member, the number of parts increases, The connection work is troublesome, and the manufacturing work of the intake manifold is troublesome.

[0010]

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

Referring to FIG. 1, an intake manifold for a vehicle is shown.
(1) is an aluminum casting plenum chamber having one intake inlet (not shown) and a plurality of intake outlets (3).
(2) and a plurality of branch pipes (4) joined to the respective intake outlets (3) of the plenum chamber (2).

An outward flange (5) is integrally formed around the intake port of the plenum chamber (2), and a throttle body (not shown) having a built-in throttle valve is attached to the outward flange (5). An air supply pipe from an air cleaner is connected to the throttle body.

An upper bulging portion (6) is integrally formed at a portion of the upper end of the plenum chamber (2) near the outward flange (5), and a lower bulging portion (7) is integrally formed at the lower end. Is formed. The space in each of the bulging portions (6) (7) is continuous with the internal space of the plenum chamber (2). An exhaust gas supply port (8) is formed on one side surface of the upper bulging portion (6) by machining. Although not shown, an exhaust gas supply port is also formed on one side surface of the lower bulging portion (7) by machining.

A projection 9 protruding downward is integrally formed on the outer surface of the lower end of the plenum chamber 2. Although not shown, a through exhaust gas passage through which the exhaust gas reduced from the exhaust manifold flows is formed in the projection (9) by machining. The exhaust gas passage is bifurcated into a vertical section with a bottom extending upward from the lower end surface of the projection (9) and an intermediate section at the height of the vertical section, and the tip is each a projection (9).
And two horizontal portions that are open on both side surfaces. The lower end opening of the vertical portion serves as an exhaust gas inlet, and the leading end opening of each horizontal portion serves as an exhaust gas outlet. One exhaust gas outlet is indicated by (11). One end of the extruded aluminum exhaust pipe (12) is joined to one exhaust gas outlet (11) of the exhaust gas passage of the projection (9) by brazing, welding, or the like,
The other end is joined to the exhaust gas supply port (8) of the upper bulging portion (6) of the plenum chamber (2) by brazing, welding, or the like. Although not shown, one end of another extruded aluminum-made exhaust gas distribution pipe is joined to the other exhaust gas outlet of the exhaust gas passage of the projection (9) by brazing, welding, or the like,
The other end is joined to the exhaust gas supply port of the lower bulging portion (7) of the plenum chamber (2) by brazing, welding, or the like.

Each of the branch pipes (4) has a portion on the cylinder head side made of an aluminum cast branch pipe constituent member (13), and a part on the plenum chamber (2) side has an aluminum wrought branch pipe. It is formed of a component (14).
The branch pipe component (13) made of aluminum casting is formed by sand casting, for example, and has a length of 150 m.
m or more. This is because the effect of preventing resonance due to the sound generated in the combustion chamber of the engine and the effect of attenuating the sound are excellent, and as a result, the generation of loud noise and the leakage of the generated noise to the outside are ensured. This is because it can be prevented. In addition, the length of the branch member (13) made of aluminum casting is at most approximately half of the entire length of the branch tube (4).

At the cylinder head side end of the aluminum cast branch pipe component (13), a flange (15) for mounting to the cylinder head is connected to all the aluminum cast branch pipe component (13). It is cast as a single piece. In addition, aluminum pipe branch pipe component (13)
The ends of the plenum chambers (2) are connected and integrated with each other by connecting portions (16) that are integrally cast. Plenum chamber of aluminum wrought branch material (14)
(2) The side end is inserted into the intake outlet (3) and brazed to the plenum chamber (2). Aluminum cast branch pipe component (13) and aluminum wrought branch pipe component (1
4) means that the ends of the wrought aluminum branch pipe constituent member (14) are inserted into the ends of the aluminum cast branch pipe constituent member (14) and are brazed to each other.

A projecting portion (17) is integrally formed with the branch member (13) made of aluminum casting at one end, and exhaust gas reduced from the exhaust manifold is passed through the projecting portion (17). A through exhaust gas passage (not shown) is formed. The projection (17) and the projection (9) are brazed so that the outlet end of the exhaust gas passage communicates with the exhaust gas passage of the projection (9) of the plenum chamber (2). Projection (1
The distal end of an exhaust gas reduction pipe made of stainless steel, steel, or the like extending from an exhaust manifold (not shown) is joined to the inlet end of the through exhaust gas passage of 7) by brazing, welding, or the like. The exhaust gas sent into the through exhaust passage by the exhaust gas reduction pipe is passed through the through exhaust passage and the exhaust gas distribution pipe made of extruded aluminum.
The air is supplied from the exhaust gas supply port (8) of the upper bulging portion (6) and the lower bulging portion (7) to the internal space of the plenum chamber (2).

In the above, the brazing of all members is
It is performed collectively.

In the above configuration, even if a noise is generated in the combustion chamber of the engine, each of the aluminum casting branch pipe constituent members (13) does not resonate, but rather attenuates the sound. Therefore, it is possible to prevent a loud noise from being generated and leaking to the outside.

In the above construction, each branch pipe (4) is formed of a branch pipe constituent member (13) made of cast aluminum and a branch pipe constituent member (14) made of wrought aluminum.
The shape of the branch pipe (4) can be complicatedly bent. That is, to prevent noise from leaking to the outside,
The entire branch pipe may be formed by casting, but in this case, it is impossible to manufacture the branch pipe in a complicatedly bent shape. Further, in the above configuration, it is possible to increase the strength of the branch pipe as compared with the case where the entirety of the branch pipe is formed of the wrought aluminum.

[0021]

According to the intake manifold of the present invention, as described above, even if the noise is generated in the combustion chamber of the engine, the branch pipe component made of aluminum casting in each branch pipe.
The material does not resonate and can attenuate the sound. Therefore, generation of loud noise and leakage of the generated noise to the outside can be prevented.

Further, when the portion formed of the aluminum casting of each branch pipe and the portion formed of the wrought aluminum material are brazed, the number of parts is reduced and the operation of manufacturing the intake manifold is reduced. It's easy.

[Brief description of the drawings]

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

[Explanation of symbols]

(1) Intake manifold (2) Plenum chamber (3) Inlet outlet (4) Branch pipe (13) Aluminum cast branch pipe component (14) Aluminum wrought branch pipe component (16) Connection part

Claims (2)

(57) [Claims] 1. A plenum chamber having an intake inlet and a plurality of intake outlets, and a plurality of branch pipes having one end connected to each intake outlet of the plenum chamber, and the other end of the branch pipe having a cylinder head of an engine. In the intake manifold which is connected to the cylinder head, the part on the cylinder head side of each branch pipe is made of aluminum casting.
Together are formed by manufacturing branch pipe component, part of the plenum chamber side is formed of aluminum wrought steel branch pipe component, the aluminum casting made branch pipe component
The plenum chamber side end is an integral casting connection
The intake manifold is interconnected and integrated by the 2. A branch pipe structure made of an aluminum casting of each branch pipe.
2. The intake manifold according to claim 1, wherein the formed member and a branch pipe component made of an aluminum wrought material are brazed .