JPH02140453A - Adapter for air intake manifold - Google Patents

Abstract

PURPOSE:To lighten an adapter as well as reduce the cost by constituting it with an adapter main body made of aluminum and an exhaust gas introduction pipe, and forming the exhaust gas introduction pipe out of a stainless steel pipe. CONSTITUTION:An air intake manifold 1 is made up of an adapter main body 2 made of aluminum and an exhaust gas introduction pipe 3 fixed at the adapter main body 2. The exhaust gas introduction pipe 3 is formed out of a stainless steel pipe 8 contacted pressingly and frictionally and in a confrontation state with one end of aluminum. The other end of an aluminum pipe 7 is inserted into a hole 9 and soldered to a pipe 4. Thus, lightweight is realized and the cost becomes inexpensive.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an adapter which is attached to an intake manifold, for example in a truck, and is used to connect a return pipe for returning exhaust gases from the engine back to the intake manifold.

In this specification, the term "aluminum" refers to
In addition to pure aluminum, aluminum alloys are included.

BACKGROUND OF THE INVENTION In large trucks, for example, a portion of the exhaust gas is returned to the intake manifold for combustion within the cylinders of the engine for complete combustion and increased efficiency. Since the exhaust gas has a high temperature of about 350° C., a stainless steel or carbon steel exhaust gas return pipe is used. Conventionally, a stainless steel or carbon steel adapter having a throttle body attachment part is attached to the intake manifold, and the exhaust gas return pipe is connected to this adapter by brazing.

Problems to be Solved by the Invention However, conventional adapters have the problems of being heavy and expensive.

Therefore, it has been considered to use an aluminum adapter, but in this case, it is difficult to braze with a stainless steel or carbon steel exhaust gas return pipe, and an intermetallic compound layer is formed in the brazed part. There is a risk that it will become brittle and break at the brazed part due to vibration, etc.

An object of the present invention is to provide an adapter for an intake manifold that solves the above problems.

Means for Solving the Problems An intake manifold adapter according to the present invention is an adapter that is attached to an intake manifold and used to connect an exhaust gas return pipe that returns exhaust gas from an engine to the intake manifold. Installation to the manifold and throttle body consists of an aluminum adapter body with a section and an exhaust gas introduction pipe fixed to the adapter body, and the exhaust gas introduction pipe is butted against the aluminum pipe and one end of this aluminum pipe. It is formed from friction welded stainless steel tubes, and an aluminum tube is joined to the adapter body.

In the above, the aluminum adapter body is
It is preferable to use one formed by bending a blank pipe made of a wrought material. This is because the inner surface is smooth, reducing ventilation resistance and increasing efficiency. Also,
The aluminum pipe in the exhaust gas introduction pipe and the adapter body are joined by brazing, welding, or the like.

Operation According to the above-mentioned adapter for the intake manifold, since the adapter body is made of aluminum, it is lighter in weight and lower in cost than the conventional adapter made of stainless steel.

In addition, the exhaust gas introduction pipe is formed from aluminum and a stainless steel pipe that is friction welded to one end of the aluminum pipe in a butt shape, and the aluminum pipe is joined to the adapter body, so that the adapter body and the exhaust gas introduction pipe are The bonding is strong. Moreover, since the exhaust gas return pipe is joined to the stainless steel pipe of the exhaust gas introduction pipe,
The two can be easily and firmly joined.

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

In Fig. 1, the intake manifold adapter (1) is
Aluminum adapter body (2) and adapter body (
2) and an exhaust gas introduction pipe (3) fixed to the exhaust gas inlet pipe (3).

The adapter body (2) has flanges (5) (e) made of extruded aluminum material fixed to both ends of a bending vibe (4) made of extruded aluminum material. One flange (5) is used to attach the intake manifold (M) to the plenum chamber (not shown), and the other flange (6) is used to attach the intake manifold (M) to the throttle body (T) containing the throttle valve (not shown). The installation is with a flange.

The exhaust gas introduction pipe (3) is formed from an aluminum pipe (7) and a stainless steel pipe (8) friction welded to one end of the aluminum pipe (7) in a butt shape. The other end of the aluminum tube (7) is the adapter body (2).
It is inserted into a hole (9) formed in the vibrator (4) and brazed to the pipe (4).

The exhaust gas introduction pipe (3) is manufactured, for example, by the method shown in FIG.

That is, first, a solid aluminum rod (11) and a solid stainless steel rod (12) are prepared (see FIG. 2(^)).・Next, the end surfaces of the side bars (11) and (12) are friction welded together in a butt shape to form a composite material (13) (see Fig. 2 (B)). Next, this composite material (13
), the burrs generated at the joints of the side bars (11) and (12) were removed, and a through hole (14) extending in the axial direction was removed.
) (see Figure 2 (C)).

Thereafter, the end of the composite material (13) on the aluminum side is cut diagonally. In this way, the exhaust gas introduction pipe (3) is manufactured.

The above adapter (1) is attached to the intake port of the plenum chamber of the intake manifold (M) using the flange (5) for attachment to the intake manifold (M), and the throttle valve is attached to the other flange (6). The built-in throttle body (T) can be installed. Then, install the exhaust gas introduction pipe (7
A stainless steel exhaust gas return pipe (1?) is welded to the stainless steel pipe (8) of ).

The high-temperature exhaust gas returned into the adapter body (2) mixes with the low-temperature intake air flowing in large quantities within the adapter body (2), and is rapidly cooled.

Effects of the Invention As described above, the intake manifold adapter of the present invention is lighter and less expensive than the conventional one made of stainless steel. Further, since the adapter body and the exhaust gas introduction pipe are firmly joined as described above, the exhaust gas introduction pipe will not come off from the adapter body due to vibration or the like. Furthermore, since the exhaust gas return pipe and the stainless steel pipe in the exhaust gas introduction pipe are easily and firmly joined, damage to the joint between the two due to vibration or the like is prevented.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view showing an embodiment of an adapter for an intake manifold according to the present invention, and FIG. 2 is a perspective view sequentially showing the manufacturing process of an exhaust gas introduction pipe. (1)...Intake manifold adapter, (2)...
Aluminum adapter body, (3)...exhaust gas introduction pipe, (5)...flange for installation on the intake manifold, (6)...slot, flange for installation on the body, (7) ...Aluminum pipe, (8)...Stainless steel pipe. that's all

Claims (1)

[Claims] An adapter body that is attached to an intake manifold and used to connect an exhaust gas return pipe that returns exhaust gas from the engine to the intake manifold, the adapter body being made of aluminum and having an attachment part to the intake manifold and a throttle body; It consists of an exhaust gas introduction pipe fixed to the adapter body, and the exhaust gas introduction pipe is formed from an aluminum pipe and a stainless steel pipe that is friction welded to one end of the aluminum pipe in a butt shape, and the aluminum pipe is joined to the adapter body. Adapter for intake manifold.