JPH10159571A - Charge cooler mounting structure of internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To use a mount also as air ducts for entrance/exit of a charge cooler, unnecessitate the separate pippins of air entrance duct and exit duct for the charge cooler and unnecessitate also mounting of a complicated thermal expansion buffer mechanism accompanied with these pipings. SOLUTION: As air ducts, entrance duct 1d/exit duct 1e which are isolated by a bulkhead 1c are provided. A charge cooler AC is mounted on a mount in which a cooling water passage 1g is internally provided to cool the entrance duct 1d. The air passage of the charge cooler AC is made a round passage shape, air entrance/exit are formed on the same side. To evade air short-circuit between the exit and entrance, a diaphragm 7 is horizontally provided between the lower end of a plate fin 6/the upper end of the bulkhead 1c.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting structure of an intake air cooler (intercooler) found in a supercharged diesel engine.

[0002]

2. Description of the Related Art In a diesel engine with a supercharger, an air supply cooler (intercooler) is provided to cool the supply air whose temperature has been raised by the supercharger and send it to a supply passage (air supply manifold) of a cylinder. In the conventional air supply cooler, the inlet and the outlet of the air passage are provided on opposite sides. Accordingly, as a conventional cooler mounting structure, first, FIGS. 6 and 7 are shown (FIG. 6 is a front view of a cooler mounting portion in a conventional internal combustion engine, and FIG. 7 is a side view of FIG. (Dashed-dotted arrows indicate the flow of air.) Inlet and outlet ducts 11 and 12 are provided from the inlet and outlet of the air passage in the charge air cooler AC 'to communicate with the supercharger and the air supply manifold, respectively.
Generally, the mount 10 of the air supply cooler has only a function as a mounting member for attaching the air supply cooler AC ′ to the engine (diesel engine) E. Further, Japanese Utility Model Laid-Open No. 5-7935 discloses an apparatus in which a mounting base is also used as an outlet duct of an air supply cooler.

[0003]

In the conventional structure shown in FIGS. 6 and 7, when the air supply cooler is attached,
Apart from the mount, air ducts (inlet duct 11 and outlet duct 12) communicating with the supercharger / supply manifold must be provided at the inlet and outlet of the supply air cooler, respectively.
Also, in the case of Japanese Utility Model Laid-Open No. 5-7935, piping for the inlet duct is required. When these pipes are used, a thermal expansion buffer mechanism (thermal expansion buffer mechanism 13 in FIGS. 6 and 7) is required at the joint. Further, when the inlet and outlet of the air passage of the supply air cooler are provided on the opposite side, air that short-circuits linearly from the inlet to the outlet without entering the cooling passage formed by fins or the like. In addition, even if there is no short circuit, the cooling efficiency is poor because the air often passes in a part, not the whole, of the cooling passage section formed by fins, etc., resulting in poor cooling efficiency. It was necessary to use a vessel. Further, regarding cooling of the engine, it is necessary to provide a cooling water pipe separately from the air duct and the mounting base.

[0004] When arranging the air duct, it is inevitable that the number of components is large, which leads to an increase in cost. In addition, distortion due to thermal deformation of components caused by the heat of high-temperature air from the supercharger flowing in the air duct causes air leakage at the joints of the components. There is a problem that it increases. Furthermore, since each component is exposed to high temperature by high-temperature air, the heat resistance of the material of each component also becomes a problem. In addition, it is necessary to provide a heat-insulating cover or the like so as not to cause a burn or the like by directly touching the member heated to a high temperature, which causes a cost increase with the use of a heat-resistant material.

Here, it is considered that an inlet / outlet air passage (air duct) is formed in the mounting base in order to eliminate the piping of the inlet / outlet duct of the air cooler. As a result, there are two joints between the parts, the risk of air leakage is reduced, and the number of materials and types of component parts can be reduced. However, the mounting base through which high-temperature air flows still has a high temperature, and it is necessary to take measures such as providing a heat-proof cover to prevent direct contact with the high-temperature mounting base and cause burns. It leads to the conversion.

Further, as both the inlet and outlet air ducts are formed in the mount, air inlets and outlets are arranged side by side on one surface (upper surface) of the mount, and the inlet and outlet of the air supply cooler are connected. By forming them on the same side, compactness is realized, and an air short circuit caused by disposing the inlet and outlet in opposition is also eliminated. However, this is based on the premise that the entrance and exit formed on the same side are effectively isolated, and if the isolation of this part is insufficient, it is rather short-circuited between the entrance and exit. Are generated, which lowers the cooling efficiency. For example, if this isolation is formed by plate fins forming a cooling passage in the supply air cooler, the structure is weak, and distortion due to the pressure and heat of the inflowing air occurs, thus causing such a problem. . If you want to provide a partition plate that does not cause distortion, it tends to be large enough to cover the entire cross section of the air supply cooler, resulting in an increase in the number of mounting bolts and high cost of the partition plate itself Become.

[0007]

According to the present invention, the following means are used to solve the above-mentioned problems relating to a structure for mounting a supply air cooler of an internal combustion engine. First, in a structure in which an air supply cooler is mounted on a mounting stand connected to an internal combustion engine, an inlet and an outlet of an air passage of the air supply cooler are formed on the same side to form an air passage circulating inside. The mounting base is integrally provided with two air ducts each communicating with an inlet and an outlet of an air passage in the air supply cooler.

The inlet and outlet of the air passage of the charge air cooler are formed on the same side to form an air passage circulating therein, and the mounting base is provided with an air passage of the charge air cooler. In a structure in which two paths of air ducts respectively communicating with the inlet and outlet of the engine are integrally provided, the passage of the engine cooling water is provided integrally.

Further, an inlet and an outlet of an air passage of the charge air cooler are formed on the same side to form an air passage circulating therein, and the mounting base is provided with an air passage of the charge air cooler. In the structure in which two-path air ducts respectively communicating with the inlet and the outlet of the air passage are integrally provided, an air passage is provided in the supply air cooler so as to be connected to a partition wall of the two-path air duct in the mounting base. Provide a partition separating the entrance and exit of the building.

[0010]

Embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a front view of a supply air cooler mounting portion in a diesel engine according to the present invention, FIG.
FIG. 3 is a front view of an air supply cooler and a mounting table for mounting the same, FIG. 4 is a side sectional view of the same, and FIG. In FIG. 4, the dashed-dotted arrow indicates the flow of air, and the two-dotted dashed arrow indicates the flow of cooling water.

First, a schematic structure of a supply air cooler (intercooler) mounting structure of the present invention in an engine will be described with reference to FIGS. In an engine (diesel engine) E, a cooling water pump P is provided on one side surface. Further, an outlet of an air supply passage from a supercharger formed in the engine E and an inlet of an air supply passage to an air supply valve are arranged and opened on a mounting side surface of the cooling water pump P in parallel. I have.

A side flange portion 1a of the mounting base 1 is attached to an inlet / outlet of an air supply passage on a side of the engine E above the cooling water pump P.
The air supply cooler AC is mounted and fixed to b.

Next, the structure of the air duct and the cooling water passage formed in the mounting base 1 will be described with reference to FIGS. The mounting base 1 has an upper end portion 1b serving as a mounting portion of an air supply cooler AC, which will be described later, that is horizontal and opened, and is provided between the side flange portion 1a to be mounted on the engine E and each opening portion of the upper end portion. And an entrance duct 1 internally separated by a partition wall 1c.
d and an outlet duct 1e. That is, the side flange portion 1a and the upper end portion 1b form an inlet / outlet of the inlet duct 1d and the outlet duct 1e. The partition wall 1c is formed integrally with the components of the mounting base 1.

Further, a cooling water inlet flange portion 1f is formed at the lower front portion of the mounting base 1, and a cooling water passage 1 is provided between the cooling water outlet opening at the side flange portion 1a.
g, and a cooling water pipe 9 is provided between the cooling water inlet flange 1f and the discharge port of the cooling water pump P disposed below the mounting base 1 to cool the cooling water. The engine cooling water discharged from the water pump P passes through a cooling water passage 1 g and is introduced into a cooling water jacket in the engine E.

As shown in FIGS. 2 and 4, the inlet portion (portion closer to the side flange portion 1a) of the inlet duct 1d is juxtaposed below the outlet portion of the outlet duct 1e. Pass in close proximity. Inlet duct 1d
Since high temperature air from the turbocharger passes through, the mounting base 1 may be thermally deformed unless it is cooled. Therefore, the cooling water passage 1g is provided so that the engine cooling water, which is originally a separate system, is drawn into the mounting base 1 and is used to cool the inlet duct 1d.
Along with this, the pipe from the cooling water pump P only needs to be the cooling water pipe 9 to the adjacent mounting base 1, the pipe length is shortened, and the pipe structure is simplified.

Next, the configuration of the air supply cooler AC is shown in FIG.
5 through FIG. Tube sheets 2a, 2a before and after supporting a cooling water pipe 5 to be described later provided therein, and cooling water headers 2.2 each having a cooling water inlet / outlet of the cooling water pipe 5 before and after that.
And a side panel 3, 3 forming left and right side surfaces, surrounds four sides, and a header 4, which forms an air circulation path 4a inside, is attached to an upper portion to form a housing. The bottom is open, and when it is attached to the upper end 1b of the mounting base 1, as shown by the arrow in FIG. 4, the air supply enters upward from the outlet of the inlet duct 1d at the upper end 1b of the mounting base 1. ,
The air supply makes a U-turn through the air circulation path 4a in the header 4 and flows downward, and flows to the inlet of the outlet duct 1e at the upper end 1b of the mounting base 1. As described above, two opposed air passages are formed in the supply air cooler AC via the air circulation passage 4a. In the past, the inlet and outlet were at opposing positions, forming a straight, one-way air passage.In this case, however, there is a lot of air that flows quickly from the inlet to the outlet without being sufficiently cooled, Although the efficiency was not very good, by circulating the air in this way, if this air path was followed, there would be almost no short-circuiting and quickly flowing air, and almost the entire amount of air would be cooled. it can.

As shown in FIG. 4, a cooling water pipe 5 is provided inside the supply air cooler AC, and plate fins 6, 6,... Air is in the inlet duct 1d
It is introduced into the supply air cooler AC and passes through the header 5,
In the process of flowing to the outlet duct 1e, the plate fin 6
6) The cooling water is guided to the space between the cooling water pipes 6 and the cooling water pipes 5 and the plate fins 6 are contacted and cooled on the way.

However, in the charge air cooler AC, FIG.
As shown by the arrow, if the supply air flows vertically upward from the inlet duct 1d, circulates in the air circulation path 4a, and does not flow vertically downward to the outlet duct 1e, the cooling effect is effective. Can not be obtained. That is, the air flowing from the inlet duct 1d flows horizontally in the vicinity of the bottom (near the portion where the mounting base 1 is attached to the upper end 1b), and short-circuits to the outlet duct 1e, thereby reducing the cooling effect. . To prevent this, the flow of air in the charge air cooler AC vertically upward from the inlet duct 1d must be isolated from the vertical downward flow to the outlet duct 1e. First, plate fin 6
In the part 6, the plate fin 6 functions as a partition wall as it is.

The problem is near the bottom air port. As means for isolating a short circuit from the inlet duct 1d to the outlet duct 1e, first, the lower end of the central plate fin 6 is
It is conceivable to extend it until it comes into contact with the upper end of the partition wall 1c. However, since the structure is weak, distortion may occur. Therefore, it is conceivable to provide a separate partition plate, but it is desired to make the structure as simple and small as possible.

The partition plate 7 shown in FIGS. 4 and 5 is configured to meet this demand. The partition plate 7 is made of a member that expands to some extent, and the upper and lower surfaces are precision finished.
Along with this, the upper end surface of the partition wall 1c is also finished with precision. The partition plate 7 is horizontally provided between the lower end of the central plate fin 6 and the upper end of the partition wall 1c of the mounting base 1 as shown in FIG. 4, and the left and right ends thereof are side plate plates 3.3 as shown in FIG.
Are secured by bolts 8, 8..., And by being laterally disposed between the side plate plates 3, the partition plate 7 itself can be stably mounted, as well as the side plate plate. It also functions as a support member of 3.3.

When the air from the inlet duct 1d flows in a state where the partition plate 7 is disposed in the air supply cooler AC in this way, the heat of the air causes the partition plate 7 to thermally expand, and the lower end surface thereof The upper end face of the partition 1c is more closely attached to the lower end of the central plate fin 6 due to the thermal expansion of the plate fin 6, so that the lower end of the plate fin 6 and the upper end of the mounting base 1 are provided. Short-circuit of air from the inlet duct 1d to the outlet duct 1e between the inlet duct 1d and the outlet duct 1e is reliably prevented, and the entire amount (substantially the entire amount) of air flowing into the air supply cooler AC from the inlet duct 1d flows vertically upward. .. And the cooling water pipe 5 are provided to obtain a cooling effect. As described above, since the introduced air is not short-circuited and the cooling action can be applied to the entire amount (substantially the entire amount), the cooling efficiency is good, and accordingly, the size of the supply air cooler AC itself is also reduced. You can do it.

[0022]

According to the present invention, since the above-described structure for mounting the supply air cooler of the internal combustion engine is provided, the following effects can be obtained.
First, since it is configured as described in claim 1, the mounting base also serves as an inlet / outlet air duct of the air supply cooler, and an air inlet duct and an outlet duct are separately provided for the air supply cooler. And there is no need to attach a complicated thermal expansion buffer mechanism associated with these pipes.

Further, according to the structure of the first aspect, even if the high temperature air from the supercharger flows inside the mounting base, the structure is as described in the second aspect. By introducing engine cooling water into the cooling water passage, the air passage through which the high-temperature air flows can be cooled,
Thermal deformation of the mounting base is avoided, no complicated components for preventing thermal deformation are required, and since the mounting base itself is prevented from being heated to a high temperature, there is no need to provide a heat protection cover or the like for preventing burns.

Further, in combination with the structure in which the air passage in the charge air cooler is circulated, the air introduced into the charge air cooler is configured to have an air passage. A short circuit to the outlet is prevented, and substantially the entire amount of air introduced into the supply air cooler from the air passage of the mounting base follows the air path according to claim 1, which obtains the essential cooling function. Therefore, the air-supply cooler having a very high cooling efficiency is provided, and the improvement in the cooling efficiency leads to a reduction in the size of the air-supply cooler.

[Brief description of the drawings]

FIG. 1 is a front view of a supply air cooler mounting portion in a diesel engine according to the present invention.

FIG. 2 is a side view of the same.

FIG. 3 is a front view of an air supply cooler and a mounting table to which the air supply cooler is attached.

FIG. 4 is a side sectional view of the same.

FIG. 5 is a side sectional view of the partition plate 7;

FIG. 6 is a front view of a cooler mounting portion in a conventional internal combustion engine.

FIG. 7 is a side view of the same.

[Explanation of symbols]

 AC supply air cooler E Engine (diesel engine) P Cooling water pump 1 Mounting base 1a Side flange 1b Upper end 1c Partition wall 1d Inlet duct 1e Outlet duct 1f Cooling water inlet flange 1g Cooling water passage 2 Cooling water header 2a Tube sheet Reference Signs List 3 side panel 4 header 4a air circulation path 5 cooling water pipe 6 plate fin 7 partition plate 8 bolt

Claims (3)

[Claims] 1. A structure in which an air supply cooler is mounted on a mounting base connected to an internal combustion engine, wherein an inlet and an outlet of an air passage of the air supply cooler are formed on the same side, and air circulating inside the air cooler is provided. A passage is formed, and a two-stage air duct communicating with an inlet and an outlet of the air passage in the supply air cooler is integrally provided in the mounting base. Container mounting structure. 2. A charge air cooler for an internal combustion engine according to claim 1, wherein a passage for engine cooling water is integrally provided in said mount. Mounting structure. 3. An air supply cooler mounting structure for an internal combustion engine according to claim 1, wherein an inlet of an air passage is provided in said air supply cooler so as to be connected to a partition wall of a two-way air duct in said mounting base. A structure for mounting an air supply cooler for an internal combustion engine, wherein a partition for isolating an outlet is provided.