JPH06146906A - Intake device of internal combustion engine having supercharger - Google Patents

Abstract

PURPOSE:To compact a piping connecting to an intercooler and a reflux passage by arranging the reflux passage between two branched discharge pipings of a supercharger. CONSTITUTION:A connecting passage branches in two passages 111a and 111b as it approaches an intercooler 10b. The structure is such that a reflux passage 109 enters between the two divided connecting passages 111a and 111b. At the middle of the two divided intercoolers 106a and 106b, an entrance port 109i of the reflux passage 109 is opened. The reflux passage 109 is arranged so as to be a partition wall of the two connecting passages 111a and 111b at the upstream side of the intercooler 106, and after that, reaches the position above the connecting passages 111a and 111b. Thus, the flow rate from the two divided intercoolers 106a and 106b to the reflux passage 109 can be kept almost uniform.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intake system for an internal combustion engine with a supercharger, and more particularly to an intake system for an internal combustion engine with a supercharger in which piping is simplified.

[0002]

2. Description of the Related Art In order to increase the intake air charge of an internal combustion engine, many are equipped with a so-called mechanical supercharger which is directly driven by the internal combustion engine. This mechanical supercharger is generally a roots type pump, but intake air discharged from the supercharger (hereinafter referred to as supercharged intake air) is supercharged in order to reduce the driving force at a low load. It is publicly known that a recirculation path for recirculation is installed on the suction side of the feeder, and the recirculation flow rate is controlled by an air bypass valve.

Further, since the discharge intake air is almost adiabatically compressed, the temperature of the supercharged intake air rises up to about 160 ° C. at maximum, but the discharge intake air is coated on the constituent parts of the supercharger by installing the return passage. It is also possible not to exceed the temperature limit of. However, if the discharge intake air temperature becomes high, the specific weight of the discharge intake air decreases, so that the weight of the intake air supplied to the cylinders of the internal combustion engine is substantially reduced and the output of the internal combustion engine cannot be maintained.

In order to solve this problem, it has been proposed to install an intercooler for cooling the discharged intake air downstream of the supercharger (see JP-A-62-247122). In the above description, it is proposed that the inlet be tapered and the guide plate be installed in the flow path so that the discharged intake air uniformly flows into the intercooler.

[0005]

However, in the above description, since the take-out position of the return path of the supercharger is the discharge side of the supercharger and the intake side of the intercooler, the temperature of the discharge intake air is the constitution of the supercharger. It is not possible to completely eliminate the risk of exceeding the temperature limit of the part. In order to solve the above-mentioned problems, it has been proposed to recirculate cooled discharge intake air to the intake side of the supercharger by using the take-out position of the return path of the supercharger as an intercooler outlet (Japanese Patent Laid-Open No. 61-61). 19935
See the bulletin).

However, in this case, it is unavoidable that the circulation route becomes long and it becomes difficult to route the pipes. The present invention has been made in view of the above problems, and an object of the present invention is to provide an intake device for an internal combustion engine with a supercharger, which enables compaction of a connecting pipe to an intercooler and a return path. To do.

[0007]

An intake system for an internal combustion engine with a supercharger according to the present invention comprises a supercharger for supercharging intake air,
An intercooler that cools the intake air discharged from the supercharger, a connection flow path that connects the supercharger and the intercooler,
An intake device for an internal combustion engine with a supercharger, comprising: a recirculation path for returning cooled intake air discharged from an intercooler to the intake side of the supercharger, the intercooler being divided into two. The turbocharger discharge pipe connected to the two divided intercoolers is branched into two, and the inlet of the return path is divided into two.
It is characterized in that a return passage from the inlet to the branch point of the supercharger discharge pipe is opened in the center of one intercooler and is arranged between the supercharger discharge pipes branched into two.

[0008]

In the intake system for an internal combustion engine with a supercharger according to the present invention, the return passage is arranged between the two supercharger discharge pipes, so that the pipe of the intake system can be easily routed. It becomes compact.

[0009]

1 is a block diagram of an intake system for an internal combustion engine with a supercharger according to the present invention, in which the air sucked from an air cleaner 101 is flow-controlled by a throttle valve 103 via an air flow meter 102. The throttle valve 103
A bypass channel 104 is provided in the.

The intake air leaving the throttle valve 103 is supercharged by a mechanical supercharger 105 driven by an internal combustion engine and cooled by an intercooler 106.
Is supplied to the cylinder 108 via. Further, a recirculation path 109 that connects the discharge side of the intercooler 106 and the suction side of the supercharger 105 is provided, and an air bypass valve 110 is installed to control the recirculation flow rate.

2, 3 and 4 are a top view, an XX sectional view, a YY sectional view and a ZZ sectional view of an intake system for an internal combustion engine with a supercharger according to the present invention. The discharge side pipe of the supercharger 105 rises almost vertically as one pipe and is gradually bent horizontally thereafter, but at the same time, it expands in a laterally tapered shape to form a flat flow path.

That is, as shown in the ZZ sectional view of FIG. 4, the return passage 109 is stacked in the connection passage 111 for guiding the intake air discharged from the supercharger 105 to the intercooler 106. Then, as it approaches the intercooler 106, the connection flow passage 111 is branched into two, 111a and 111b, and a return passage 109 is formed as shown in the Y-Y sectional view of FIG.
Has a structure of entering between the connection flow channels 111a and 111b branched into two.

Connection channels 111a and 111 which are branched into two
b is connected to the intercoolers 106a and 106b divided into two, respectively. An inflow port 109i of the return passage 109 is opened at the center of the two intercoolers 106a and 106b. That is, return path 1
On the upstream side of the intercooler 106, 09 is arranged so as to be a dividing wall of the two connection flow passages 111a and 111b, and then emerges above the connection flow passage 111.

The return path 1 downstream of the air bypass valve 110
09 is drawn horizontally from the air bypass valve 110 in order to avoid interference with the discharge side pipe drawn from the supercharger 105, then descends and is connected to the suction side of the supercharger 105. It should be noted that intake air other than the intake air that is recirculated through the recirculation path 109 is supplied from the two manifolds 112 to the cylinder 1 of the internal combustion engine.
It is inhaled at 08.

Further, the intake system for the internal combustion engine with a supercharger, in which the connection flow path and the return flow path shown in the above embodiment are integrated, can be formed of, for example, an aluminum casting.

[0016]

According to the intake system for an internal combustion engine with a supercharger according to the present invention, the supercharger intake from the intercooler is provided between the connecting passages connecting the supercharger and the intercooler that are branched into two. By arranging the recirculation path for recirculating the intake air in the mouth, it is possible to arrange the piping of the intake device compactly.

Further, since the inflow port of the recirculation passage is arranged at the center of the intercooler, it is possible to keep the flow rate flowing into the recirculation passage from the two divided intercoolers substantially even.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an embodiment of an intake device for an internal combustion engine with a supercharger according to the present invention.

FIG. 2 is a top view of an intake device for an internal combustion engine with a supercharger according to the present invention.

FIG. 3 is an X of an intake device for an internal combustion engine with a supercharger according to the present invention.
It is a -X sectional view.

FIG. 4 is a diagram of Y of an intake device for an internal combustion engine with a supercharger according to the present invention.
It is a -Y sectional view and a ZZ sectional view.

[Explanation of symbols]

 101 ... Air Cleaner 102 ... Air Flow Meter 103 ... Throttle Valve 104 ... Bypass Channel 105 ... Mechanical Supercharger 106 ... Intercooler 109 ... Return Channel 110 ... Air Bypass Valve

Claims (1)

[Claims] 1. A supercharger for supercharging intake air, an intercooler for cooling the intake air discharged from the supercharger, and a connection flow path connecting the supercharger and the intercooler. In an intake device for an internal combustion engine with a supercharger, comprising: a recirculation path for returning cooled intake air discharged from the intercooler to an intake side of the supercharger, the intercooler is divided into two, The supercharger discharge pipe connected to the two divided intercoolers is branched into two, and the inlet of the return passage is opened at the center of the two intercoolers, and the supercharge is supplied from the inlet. An intake system for an internal combustion engine with a supercharger, characterized in that a return path to the branch point of the machine discharge pipe is arranged between two supercharger discharge pipes.