JP4090109B2 - Intake manifold for internal combustion engine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an intake manifold of an internal combustion engine in which a high-temperature return pipe for returning exhaust gas is connected to an intake manifold made of synthetic resin.
[0002]
[Prior art]
An intake manifold of this type of internal combustion engine is also known from the disclosure in, for example, Japanese Patent Application Laid-Open No. 6-101587. An intake manifold of an internal combustion engine disclosed in this publication is an internal combustion engine in which high-temperature parts such as a valve for an exhaust gas recirculation device are attached to a synthetic resin manifold body that forms an intake passage therein via a heat-resistant attachment. In this intake manifold, a part of the attachment is constituted by a corrugated mounting housing, and the corrugated intake passage side end portion of the mounting housing is projected into the intake passage.
[0003]
However, there have actually been technical problems described below.
[0004]
[Problems to be solved by the invention]
That is, in the intake manifold disclosed in the above-mentioned publication, a high-temperature part such as an exhaust gas recirculation device valve is attached via a heat-resistant attachment, and a part of the attachment is attached in a wave shape. Consists of a housing, the corrugated intake passage side end of the mounting housing protrudes into the intake passage, dissipates heat from the high-temperature components, and cools, so that a large amount of heat from the high-temperature components enters the resin intake manifold body However, there is a problem that the corrugated intake passage side end portion of the housing protrudes into the intake passage so that there is only a small protruding portion toward the intake passage side and heat cannot be sufficiently radiated.
[0005]
The present invention solves the above-mentioned problems. A high-temperature reflux pipe is connected to a metal pipe at a position separated from the synthetic resin inlet pipe, and the end of the metal pipe is fixed to the inlet pipe. The other is fixed to a metal cylinder provided in the intake passage, a metal guide path is provided on the outer periphery of the metal cylinder, and an exhaust gas outlet pipe is provided around the guide path, so that heat is radiated by the metal cylinder. Therefore, it is to provide an intake manifold with sufficient heat dissipation.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides an intake manifold for an internal combustion engine in which a high-temperature recirculation pipe that recirculates exhaust gas is connected to a synthetic resin manifold having an intake passage inside. The end of the metal pipe is fixed to the inlet pipe, and the other end is fixed to the metal cylinder provided in the intake passage. A metal guide path is provided on the outer periphery of the metal cylinder so that the guide path has a cross section surrounded entirely by a metal member constituting the metal cylinder and a metal member provided on the outer periphery of the metal cylinder. An exhaust gas outlet pipe is provided in the metal member provided on the outer periphery so as to communicate with the inside of the guide path, and a steel cushion is provided between the outer periphery of the guide path and the inner surface of the intake manifold. It is what.
[0007]
According to the above configuration, the high-temperature reflux pipe is connected to the metal pipe at a position separated from the synthetic resin inlet pipe, the end of the metal pipe is fixed to the inlet pipe, and the other is provided in the intake passage. Adhering to a metal cylinder, a metal guide path is provided on the outer periphery of the metal cylinder, and an exhaust gas outlet pipe is provided around the guide path, so that heat is radiated by the metal cylinder and sufficient heat dissipation is possible. . According to the present invention , since the steel cushion is provided between the outer periphery of the guide path and the inner surface of the intake manifold, the steel cushion absorbs the thermal expansion of the intake manifold and the metal cylinder. It is also possible to prevent deformation of the metal cylinder.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Preferred embodiments of the present invention will be described below in detail with reference to the drawings. 1 is a cross-sectional view of an intake manifold of the internal combustion engine of the present invention, FIG. 2 is another cross-sectional view of the intake manifold of the internal combustion engine, and FIG. 3 is a cross-sectional view taken along line AA of FIG.
[0009]
As shown in FIG. 1, a synthetic resin manifold 3 having an intake passage 1 and a recess 2 therein is provided with a high-temperature reflux pipe 4 for refluxing exhaust gas and an inner surface 6 of a synthetic resin inlet pipe 5. The metal tube 8 is connected to an isolated metal tube 8 with a gap 7 therebetween, and the end 9 of the metal tube 8 is fixed to the inlet end 10 of the inlet tube 5. On the other hand, the end 11 of the metal pipe 8 is fixed to a metal cylinder 12 provided in the intake passage 1, and a metal guide path 13 is provided on the outer periphery of the metal cylinder 12 so as to be displaced toward the inlet pipe 5. At least six exhaust gas outlet pipes 14 are provided around the guide path 13.
[0010]
In the metal cylinder 12, the outer peripheral surface 15 of the guide path 13 is inserted into the recess 2 in the intake manifold 3, and three or more steel cushions 16 are connected to the outer peripheral surface 15 of the guide path 13 as shown in FIGS. 2 and 3. Between the intake manifold 3 and the inner surface 17 of the recess 2 in the intake manifold 3. The steel cushion 16 absorbs the difference in thermal expansion between the intake manifold 3 and the metal cylinder 12.
[0011]
In the above configuration, when the high-temperature exhaust gas of the internal combustion engine is sent from the reflux pipe 4 to the metal cylinder 12, the exhaust gas flows through the guide path 13, but the guide path 13 is displaced toward the inlet pipe 5 side. Therefore, the exhaust gas can flow through the guide path 13 without resistance. At this time, exhaust gas flows all around the guide path 13 and heat is transmitted to the entire metal cylinder 12, and the exhaust gas flows into the intake manifold 3 from the outlet pipe 14. In this way, heat is transmitted to the entire metal tube 12, and heat exchange is performed between the outer surface of the metal tube 12 which is high temperature and the cold inner surface by the intake air, whereby the heat of the metal tube 12 is dissipated. As a result, the metal pipe 8 is not cooled and the synthetic resin inlet pipe 5 is not damaged.
[0012]
As for the metal cylinder 12, the outer peripheral surface 15 of the guide path 13 is inserted in the recessed part 2 in the intake manifold 3, and the outer peripheral surface 15 of the guide path 13 and the recessed part 2 in the intake manifold 3 are shown in FIG. 2 and FIG. The steel cushion 16 is held by at least three steel cushions 16 between the inner surface 17 and the steel cushion 16 so as to absorb the difference in thermal expansion between the intake manifold 3 and the metal cylinder 12 and prevent deformation thereof.
[0013]
【The invention's effect】
According to the above configuration, when the high-temperature exhaust gas of the internal combustion engine is sent from the recirculation pipe to the metal cylinder, the exhaust gas flows in the guide path. At this time, the guide path is displaced to the inlet pipe side. Therefore, the exhaust gas can flow through the guide path without resistance, the exhaust gas flows all around the guide path, heat is transmitted to the entire metal cylinder, and flows into the intake manifold from the outlet pipe. In this way, heat is transferred to the entire metal tube, and heat exchange is performed between the outer surface of the metal tube which is high temperature and the cold inner surface by the intake air, so that the heat of the metal tube is dissipated and the metal tube There is an effect that the pipe is not cooled and the synthetic resin inlet pipe is not damaged.
[0014]
Further, the outer circumference of the guide path is inserted into a recess in the intake manifold, and the metal cylinder is held by at least three steel cushions between the outer circumference of the guide path and the inner surface of the recess in the intake manifold. The steel cushion also has the effect of preventing the deformation of the metal cylinder by absorbing the difference in thermal expansion between the intake manifold and the metal cylinder.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an intake manifold of an internal combustion engine according to the present invention.
FIG. 2 is another cross-sectional view of the intake manifold of the internal combustion engine.
3 is a cross-sectional view taken along line AA in FIG. 2;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Intake passage 3 Intake manifold 4 Reflux pipe 5 Inlet pipe 8 Metal pipe 12 Metal cylinder 13 Guide path 14 Outlet pipe 16 Steel cushion

Claims (1)

In an intake manifold of an internal combustion engine in which a high-temperature reflux pipe that circulates exhaust gas is connected to a synthetic resin manifold having an intake passage inside,
The reflux pipe is connected to a metal pipe piped at a position separated from the inner surface of the synthetic resin inlet pipe, the end of the metal pipe is fixed to the inlet pipe, and the other is connected to a metal cylinder provided in the intake passage. The metal guide path is fixed to the outer periphery of the metal cylinder, and the guide path is entirely surrounded by the metal member constituting the metal cylinder and the metal member provided on the outer periphery of the metal cylinder. An exhaust gas outlet pipe is provided in the metal member provided on the outer periphery so as to communicate with the inside of the guide path, and a steel is provided between the outer periphery of the guide path and the inner surface of the intake manifold. An intake manifold for an internal combustion engine, comprising a cushion.

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