Exhausted Gas Recycle Device

This invention relates to an exhausted gas recycle device which is connected to a resin intake manifold.

In general, an exhausted gas recycle device is installed to connect to an intake manifold. As shown in FIG. 7, an exhausted gas recycle device 12 of the prior art (Japanese utility model laid open 1987(62)-165463) is shaped like a pipe and connected into an inlet hole 11a opened in a wall of the intake manifold 11 of an automobile engine 14. An insulative tube 13 made of resin is installed in the intake manifold in order that the exhausted gas may hit an inner wall 13a thereof.

The exhausted gas recycle device 12 is fixed to the insulative tube 13 by force or by a screw. When the resin from which make the insulative tube 13 is made is a cheap one, for example, 6-nylon, 6,6-nylon or polyethyleneterephthalate, a part of the inner wall 13a which is opposite to the exhausted gas recycle device 12 degrades because the heat thereof is very high. In addition, fastening the insulative tube 13 to the inner surface of the intake manifold 11 is difficult and the insulative tube 13 separates from the intake manifold 11 due to expansion and shrinking with heat. Moreover the insulative tube 13 and the parts surrounding may sometimes be broken.

It is an object of the invention to provide an improved exhausted gas recycle device which obviates the above conventional drawbacks.

It is another object of the invention to provide an improved exhausted gas recycle device in which parts of the resin are not broken by deterioration the case of that an inlet hole is formed on the intake manifold.

In order to attain the foregoing objects, an exhausted gas recycle device which is installed on an intake manifold is comprised of an inlet portion which is penetrated into said intake manifold and communicated to an exhaust manifold and at least one hole formed on said inlet portion in said intake manifold.

The above and other objects, features and advantages of the present invention will be more apparent and more readily appreciated from the following detailed description of preferred exemplary embodiments of the present invention, taken in connection with the accompanying drawings, in which;

FIG. 1 is a cross sectional view showing an exhausted gas recycle device of the first embodiment according to the present invention;

FIG. 2 is a perspective view showing an exhausted gas recycle device of the first embodiment of the present invention;

FIG. 3 is a cross sectional view showing an exhausted gas recycle device of the second embodiment according to the present invention;

FIG. 4 is a perspective view showing an exhausted gas recycle device of the second embodiment of the present invention;

FIG. 5 is a cross sectional view showing an exhausted gas recycle device of the third embodiment according to the present invention;

FIG. 6 is a cross sectional view showing an exhausted gas recycle device of the fourth embodiment according to the present invention;

FIG. 7 is a cross sectional view showing an exhausted gas recycle device of the prior art.

Referring to FIGS. 1 and 2, there is illustrated an exhausted gas recycle device 10 according to the first embodiment which includes an inlet portion 4 which an exhausted gas flows through. The inlet portion 4 penetrates into an intake manifold 1 and communicates to an exhaust manifold of an engine (not shown) and it has plural holes 4a-4d which communicate the inner space of the inlet portion 4 with the inner space of the intake manifold 1. A flange 2 is formed surrounding the inlet portion 4. The inlet portion 4 is fixed into an inlet hole 1a which is opened on an wall of a resin intake manifold 1 with a ring seal 9 formed around the inlet hole 1a. For example, the inlet portion 4 and the intake manifold 1 may be fixed with screws (not shown) into a screw hole 2a of the flange 2. Thus the exhausted gas flows out from the holes 4a-4d to the inner space of the intake manifold 1. The exhausted gas is diffused through the holes 4a-4d so that it does not directly attack the inner surface of intake manifold 1 opposite to the inlet portion 4. Therefore the resin intake manifold 1 is pretected from deterioration.

Referring to FIGS. 3 and 4, there is illustrated an exhausted gas recycle device 20 according to the second embodiment. The exhausted gas recycle device 20 is installed in the intake manifold 1 the same as the first embodiment. In this embodiment, a porous member 5 which is sintered, for example, made of ceramics, is fixed into the end of the inlet portion 4 by force. The porous member 5 can also be installed to the end of the inlet portion 4 by adhesives. The exhausted gas is diffused through the small holes 6a, 6b of the porous member 5 so that the resin intake manifold 1 is protected from deterioration.

FIG. 5 shows a third preferred embodiment according to this invention. In this embodiment, the inlet hole 1a in the intake manifold 1 is bigger than the diameter of the inlet portion 4 and a heat insulator 7 which is made of phenol resin is installed between the intake manifold 1 and the inlet portion 4. The heat insulator 7 includes a doughnut plate 7a and a projection 7b which projects from the center hole of the doughnut plate 7a. The inlet portion 4 is installed in the intake manifold 1 through the heat insulator 7. The inlet portion 4 has plural holes 4a-4c. The inlet hole 1a of the intake manifold 1 is not deteriorated because the heat insulator 7 prevents the heat of the inlet portion 4 heated by the exhausted gas from being conveyed to the inlet hole 1a. The exhausted gas is diffused through the holes 4a-4c so that the surface opposite to the inlet portion 4 is protected from deterioration as well.

Referring to FIG. 6 which shows the fourth preferred embodiment of the present invention, the inlet portion 4 is made of a foaming member like azo-di-calbonamid. The foaming member prevents the heat of the exhausted gas from being conveyed to the intake manifold 1. The holes 4a-4c are opened on the inlet portion 4 to offer the same effect as the first to third embodiments.

For the material of the inlet portion 4, steel, aluminium, other metals, azo-di-calboneamid, phenol resin, unsaturated polyester resin, other thermosetting resins, polyphenylene sulfide (PPS resin), polyether ether ketone (PEEK resin), other thermoplastic resins which are superior in thermal resistance and resistance against deterioration, and ceramics and so on are used.

Obviously numerous modifications and variations of the present invention are possible in light of the above teachings. It is therefore to be understood that within the scope of the appended claims, the invention may be practiced otherwise than as specifically described herein.