JP5096982B2 - Exhaust gas recirculation device in internal combustion engine - Google Patents

Description

The present invention, in an internal combustion engine, to an apparatus which Ru is recirculated to the intake system part of the exhaust gas in the exhaust system.

  Conventionally, this type of exhaust gas recirculation device is, for example, as described in Patent Documents 1 and 2, in the exhaust manifold recirculation line from the exhaust system to the intake manifold of the intake system in the internal combustion engine. This portion is inserted and inserted into the intake manifold, and a gas injection port into the intake manifold is provided at the insertion insertion portion.

  According to this configuration, it is possible to evenly distribute the recirculated exhaust gas to each cylinder.

Further, when the intake manifold is made of synthetic resin, avoids said insertion insertion portion, by configuring so as not to contact the intake manifold to heat deformation I by the intake manifold the reflux exhaust gas it can.
Japanese Utility Model Publication No.59-159767 JP 2004-332676 A

  However, the exhaust gas recirculation line from the exhaust system to the intake manifold is generally made of a metal pipe, and condensed water that has condensed when the operation of the internal combustion engine is stopped accumulates in the inside. It will be.

In contrast, the as in the prior art, wherein when the difference is included insertion portion of the exhaust gas recirculation passage only digits set the gas jets, exhaust gas to the intake system after the start of the next engine when the reflux is started, the all condensed water accumulated in the exhaust gas recirculation passage is ejected all at once to the refluxing simultaneously with the start of the intake manifold of the exhaust gas, the condensed water into the combustion chamber in each cylinder There is a problem of inhibiting the ignition and combustion of the mixed Aiki What optimum, and if the a intake manifold gold genus made, the corrosion caused by condensed water there is a problem that occurs in the intake manifold.

  The present invention has a technical problem to solve these problems.

This onset Akira order to achieve this technical problem,
"An intake manifold made of a synthetic resin, and a part of the air intake manifold exhaust gas recirculation pipe that Ru refluxed in the exhaust gas, wherein the exhaust gas recirculation pipe, insertion Previous Symbol intake manifold the insertion portion is provided with, on the insertion insertion portion, Oite to an internal combustion engine comprising providing a gas injection port into said intake manifold,
Plug insertion portion of the exhaust gas recirculation conduit, the lower end be inclined to or obliquely downward is downward has become a configuration busy is a further said gas jets, the plug insertion portion Among them, the lower end is provided in a portion upstream from the blocked portion, and the drainage hole is provided in the blocked portion of the insertion insertion portion. ' '
It was configured as follows.

According to the present invention, the exhaust gas recirculated to the intake manifold from the exhaust gas recirculation pipe after the start of the internal combustion engine, the lower end of the downward insertion insertion portion or inclined obliquely Me downward Chi caries the exhaust gas recirculation pipe After striking the closed portion of the gas and changing the direction in the opposite direction, the gas is blown into the intake manifold from a gas outlet located upstream of the blocked portion.

At this time , a part of the condensed water accompanying the recirculated exhaust gas into the intake manifold is changed in the reverse direction when the exhaust gas hits the blocked portion and changes its direction. By separating so as to accumulate in the portion downstream from the gas outlet, the condensed water sprayed into the intake manifold at the same time as the exhaust gas recirculation starts can be eliminated or reduced.

  Then, the condensed water accumulated in the downstream portion of the insertion insertion portion from the gas outlet is evaporated and disappears by the heat of the recirculated exhaust gas.

Therefore, the low reduction that you ignition combustion of the fuel-air mixture in the combustion chamber is inhibited by the condensed water of the exhaust gas recirculation conduit.

In the present invention, the condensed water can before Symbol exhaust gas recirculation conduit Te shutdown in odor of the internal combustion engine, since sequentially discharged from the drain hole in the synthetic resin intake manifold, corrosion intake manifold while it is possible to prevent the but occur, even if the exhaust gas recirculation pipe to the metal pipe from the viewpoint of heat resistance and workability can be improved and the durability can be prevented from the corrosion occurs in this.

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

  1 to 4 show a first embodiment.

  In these drawings, reference numeral 1 denotes an internal combustion engine, and reference numeral 2 denotes an intake manifold for the internal combustion engine 1.

  The intake manifold 2 is made of heat-resistant synthetic resin, and includes a surge tank 4 having an intake passage 3 from an air cleaner (not shown), and a plurality of branches branching from the surge tank 4 to a plurality of cylinders in the internal combustion engine 1. And an intake pipe 5.

Reference numeral 6 shows the exhaust gas recirculation pipe for recirculating a part of exhaust gas in the internal combustion engine 1 into the intake manifold 2. The exhaust gas recirculation pipe 6 is made of metallic pipe, one end thereof is connected to the reflux control valve 7, the other end portion of the front Symbol intake manifold 2 side, the flange member 12 which is fixed thereto Thus, it is joined to the surge tank 4 in the intake manifold 2 in a substantially lateral direction such as horizontal or substantially horizontal, and the other end portion is fixed to the flange member 12. the by the structure and child having a metal plate tube joint 13 therebetween, heat transfer from the exhaust gas recirculation pipe 6 to the joining flange member 12, and thus the heat transfer of the to the intake manifold 2 It has been avoided.

  An insertion insertion portion 6 a into the surge tank 4 in the intake manifold 2 is provided at the other end portion of the exhaust gas recirculation pipe 6 on the intake manifold 2 side. The passages 5 are integrally provided so as to extend in the row direction.

  The insertion insertion portion 6a is configured not to contact the intake manifold 2, and in the surge tank 4, it is inclined in an obliquely downward direction by an appropriate angle θ from a substantially lateral direction in the joining flange portion 12. The metal cap body 8 closed by the bottom plate 8a is fixed to the tip, and the lower end of the insertion insertion portion 6a is closed.

  In this case, in another embodiment, the lower end of the insertion insertion portion 6a is closed by, for example, providing a bottom plate without using the cap body 8 with the bottom plate 8a. Can be.

  Further, on the side surface of the insertion insertion portion 6a that is closer to the tip side than the inner surface of the surge tank 4, a portion of the insertion insertion portion 6a upstream of the bottom plate 8a that closes the lower end of the insertion insertion portion 6a is appropriately positioned upstream. A gas outlet 9 into the surge tank 4 is drilled sideways.

  With this configuration, the exhaust gas recirculated from the exhaust gas recirculation pipe 6 to the intake manifold 2 after the start of the internal combustion engine is inserted into the exhaust gas recirculation pipe 6 so as to be inclined obliquely downward in the intake manifold 2. After colliding with the closed portion (bottom plate 8a) at the lower end of the portion 6a and changing the direction in the reverse direction, the air is sucked from the gas outlet 9 located upstream of the blocked portion (bottom plate 8a). It ejects into the manifold 2.

At this time, part of the condensed water entrained in the recirculated exhaust gas to the intake manifold 2, when the exhaust gas redirecting the opposite direction abuts against the closed portion (bottom plate 8a), said plug By separating the insertion portion 6a so as to accumulate in the downstream portion of the gas ejection port 9, it is possible to eliminate the condensed water that is ejected into the intake manifold 2 at the same time as the exhaust gas recirculation starts. Less.

  Then, the condensed water accumulated in the portion of the insertion insertion portion 6a on the downstream side of the gas jetting port 9 is eventually evaporated and disappears by the heat of the recirculated exhaust gas.

In the first embodiment, the insertion insertion portion 6a is inclined obliquely downward by an appropriate angle θ from a substantially lateral direction in the surge tank 4 in the intake manifold 2. the insertion insertion portion 6a, it is needless to say that even in the configuration of the substantially downward obtain the same effect as above.

  In this case, as a second embodiment, as shown in FIG. 5, the insertion insertion portion 6a is formed from a substantially lateral direction in a portion upstream of the flange member 12 outside the surge tank 4. It may be configured to be inclined obliquely downward by an angle θ as appropriate.

  Further, in each of the illustrated embodiments, a pipe-like nozzle 10 that is inclined obliquely upward by an appropriate angle α as shown in FIG. 4 is provided at the gas outlet 9 in the insertion insertion portion 6a. Since the nozzle 10 can introduce the recirculated exhaust gas into the intake manifold 2 with a certain directivity, the distribution to each branch intake pipe 5 can be improved.

Furthermore, in each of the illustrated embodiments, as shown in FIGS. 3 and 4, a small-diameter drain hole 11 is formed in a portion (bottom plate 8a) that closes the lower end of the insertion insertion portion 6a. Thus, the condensed water generated in the insertion insertion portion 6a is gradually discharged from the drain hole 11.

It is a side view of an internal combustion engine. FIG. 2 is an enlarged cross-sectional view taken along line II-II in FIG. 1 in the first embodiment. FIG. 3 is an enlarged sectional view taken along line III-III in FIG. 2. FIG. 4 is a sectional view taken along line IV-IV in FIG. 3. FIG. 2 is an enlarged cross-sectional view taken along the line II-II in FIG. 1 in the second embodiment.

DESCRIPTION OF SYMBOLS 1 Internal combustion engine 2 Intake manifold 3 Intake line 4 Surge tank 5 Branch intake line 6 Exhaust gas recirculation line 6a Insertion insertion part 8 Cap body 8a Bottom plate 9 Gas outlet 10 Nozzle 11 Small hole

Claims (1)

An intake manifold made of a synthetic resin, and a part of the air intake manifold exhaust gas recirculation pipe that Ru refluxed in the exhaust gas, the exhaust gas recirculation conduit, plug insertion Previous Symbol intake manifold parts are provided, on the insertion insertion portion, Oite to an internal combustion engine comprising providing a gas injection port into said intake manifold,
Plug insertion portion of the exhaust gas recirculation conduit, the lower end be inclined to or obliquely downward is downward has become a configuration busy is a further said gas jets, the plug insertion portion Among them, the lower end is provided in a portion upstream from the blocked portion, and the drainage hole is provided in the blocked portion of the insertion insertion portion,
An exhaust gas recirculation device for an internal combustion engine.

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