JPH0442541B2 - - Google Patents

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" includes aluminum alloys in addition to pure aluminum.

BACKGROUND OF THE INVENTION For example, in large trucks, a portion of the exhaust gas is returned to the intake manifold for combustion within the engine sill 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 portion 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 at 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 The intake manifold adapter according to the present invention has the following features:
An adapter 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 comprising:
It consists of an aluminum adapter body that has an attachment part to the intake manifold and the throttle body, and an exhaust gas introduction pipe that is fixed to the adapter body. It is formed from pressure-welded stainless steel tubes, and an aluminum tube is joined to the adapter body.

In the above, as the aluminum adapter body, it is preferable to use one formed by bending a blank pipe made of a wrought material. This is because the smooth inner surface reduces ventilation resistance and increases efficiency. In addition, the connection between the aluminum pipe and the adapter body in the exhaust gas introduction pipe is
This is done by brazing, welding, etc.

Effects According to the above-mentioned intake manifold adapter, since the adapter body is made of aluminum, it is lighter and less expensive than conventional ones 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 joining between the two can be easily and firmly performed.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

In Fig. 1, the intake manifold adapter 1
consists of an aluminum adapter body 2 and an exhaust gas introduction pipe 3 fixed to the adapter body 2.

The adapter main body 2 has flanges 5 and 6 made of wrought aluminum material fixed to both ends of a bent pipe 4 made of extruded aluminum material. One flange 5 is a flange for attaching the intake manifold M to a plenum chamber (not shown),
The other flange 6 is a throttle valve (not shown)
This is a flange for mounting on the throttle body T with built-in.

The exhaust gas introduction pipe 3 is formed from an aluminum pipe 7 and a stainless steel pipe 8 which is friction welded to one end of the aluminum pipe 7 in a butt shape.
The other end of the aluminum tube 7 is inserted into a hole 9 formed in the pipe 4 of the adapter body 2 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,
Similarly, a solid stainless steel rod 12 is prepared (see FIG. 2A). Next, a composite material 13 is produced by friction welding the end surfaces of the rods 11 and 12 into butts (see FIG. 2B). Next, this composite material 13 is subjected to a treatment to remove burrs generated at the joint between the two rods 11 and 12, and a drilling process is performed to form a through hole 14 extending in the axial direction (see Fig. 2C). ). Thereafter, the end of the composite material 13 on the aluminum side is cut diagonally. In this way, exhaust gas introduction valve 3 is produced.

The adapter 1 has an intake port attached to a plenum chamber of the intake manifold M using a flange 5 for attachment to the intake manifold M, and a throttle body T having a built-in throttle valve can be attached to the other flange 6. Then, a stainless steel exhaust gas return pipe R is welded to the stainless steel pipe 8 of the exhaust gas introduction pipe 7.

The high-temperature exhaust gas returned into the adapter body 2 mixes with 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 in weight and lower in cost than the conventional one made of stainless steel. Furthermore, 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. Moreover, 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... Adapter for intake manifold, 2... Aluminum adapter body, 3... Exhaust gas introduction pipe, 5... Flange for attachment to intake manifold, 6... Flange for attachment to throttle body, 7... Aluminum pipe , 8...Stainless steel pipe.

Claims (1)

[Claims] 1. An adapter body that is attached to the intake manifold and used to connect an exhaust gas return pipe that returns exhaust gas from the engine to the intake manifold, and that is made of aluminum and has an attachment part to the intake manifold and the 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.