JP3355205B2 - Supercharger cooling structure of internal combustion engine with supercharger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for cooling an exhaust turbocharger in an internal combustion engine having an exhaust turbocharger.

[0002]

2. Description of the Related Art An exhaust turbocharger uses a kinetic energy of exhaust gas to rotate a turbine at a high speed, and transmits an output of the turbine to a compressor connected to the turbine, thereby operating the compressor and supplying a gas to a combustion chamber. The intake air is pressurized. Since the exhaust gas has a high temperature, it is required to cool the turbine portion of the exhaust turbocharger in order to prevent damage due to a rise in temperature of the turbine portion and to maintain a desired operating efficiency of the turbine.

In this regard, for example, Japanese Patent Application Laid-Open No.
Japanese Patent No. 35929 discloses cooling a supercharger by supplying a part of engine cooling water from a radiator to a supercharger arranged behind a radiator.

[0004]

However, in the turbocharger cooling device described in the publication, a cooling water passage for supplying a part of the engine cooling water to the supercharger, and a tank for storing the cooling water. In addition to the necessity of providing a tank, the tank must be located higher than the turbocharger to absorb the steam inside the turbocharger. I have to become. For this reason, the supercharger cooling device described in the publication is not necessarily suitable as a cooling device in an engine room where space saving is required.

[0005] The present invention has been made in view of such a point, and in a structure for cooling a supercharger disposed behind a radiator, the structure for cooling the supercharger is not complicated. An object of the present invention is to provide a supercharger cooling structure for an internal combustion engine with a supercharger, which can cool a supercharger by appropriately arranging existing elements.

[0006]

In order to achieve this object, in a supercharger cooling structure according to the present invention, two cooling fans are mounted on a radiator at the rear side thereof in parallel in the vehicle width direction. The turbocharger is disposed such that its compressor side is located between the two cooling fans and its turbine side is located behind one of the cooling fans when viewed from the front, and the radiator hose taken out of the radiator is connected to the one cooling fan. It extends between the fan and the supercharger along the outer periphery of the one cooling fan as viewed from the front, and separates the compressor side and the turbine side of the supercharger.

In a preferred embodiment of the present invention, a supercharger lubrication oil pipe is disposed between the supercharger and the radiator hose so as to be located behind the radiator hose.

[0008]

Since the turbine side of the turbocharger is disposed behind one of the two radiator cooling fans, the airflow passing through the cooling fan directly hits the turbine.
At this time, the radiator hose is arranged along the circumference of the cooling fan to prevent the air flow from the cooling fan from going to the compressor side. It corresponds to a turbine. Since the airflow that has passed through the cooling fan passes through the radiator before passing through the cooling fan, the temperature is relatively high,
Still, since the temperature is lower than the temperature of the turbine, the turbine side of the turbocharger is effectively cooled by the airflow passing through the cooling fan.

Further, since the compressor side of the supercharger is disposed between the two cooling fans, the relatively warm airflow passing through the cooling fan does not directly hit the compressor side. In addition, since the cooling fan for cooling the turbine side is surrounded by the radiator hose, the airflow from the cooling fan does not reach the compressor side. Since the temperature on the compressor side is lower than both the temperature of the air flow passing through the radiator and the cooling fan and the temperature of the air flow from the cooling fan cooling the turbine side, the temperature will increase when exposed to such air flow. However, as described above, since the air flow passing through the two cooling fans is configured not to hit the compressor side, the compressor side of the supercharger depends on the air flow passing through the cooling fan. There is no warming.

As described above, according to the present invention, since the turbine side of the supercharger is cooled and the compressor side is warmed, the charging efficiency of the supercharger can be improved.
As described above, by determining the positional relationship between the cooling fan and the turbine side and the compressor side of the supercharger and the direction in which the radiator hose is extended as in the present invention, the structure for cooling becomes complicated. It is possible to effectively cool the turbocharger without performing any additional operation and without providing new components for cooling.

Further, by arranging the supercharger lubrication oil pipe behind the radiator hose when viewed from the front, the radiator hose protects the oil pipe from the external force to some extent even if an external force acts from the front during a vehicle collision. Therefore, damage to the oil pipe at the time of collision can be prevented to some extent.

[0012]

1 and 2 show a supercharger cooling structure according to an embodiment of the present invention. FIG. 1 is a plan view seen from above, and FIG. 2 is a front view. As shown in FIG. 1, behind a radiator 1 disposed in front of an engine room 2, there are two cooling fans 3 </ b> A and 3 </ b> B for cooling the radiator behind a radiator 1 which is mounted in parallel in the vehicle width direction. A supercharger 9 is disposed on an exhaust manifold 7 extending from the engine 5 located. The supercharger 9 includes a turbine 9A and a compressor 9B. The supercharger 9 rotates the turbine 9A by the exhaust gas passing through the exhaust manifold 7, and operates the compressor 9B using the rotational force. After the intake air is pressurized by the compressor 9B, it is sent into the combustion chamber. The exhaust gas that has passed through the supercharger 9 is sent to a muffler (not shown) (in FIG. 2, for clarity, the radiator 1 and the cooling fans 3A, 3B
Is indicated by a broken line, and the engine 5 and the exhaust manifold 7 are omitted).

The supercharger 9 includes a cooling fan 3 and a turbine 9A.
Almost behind A, a compressor 9B is disposed so as to be located between the two cooling fans 3A and 3B. A cooling water outlet 11 is provided at a lower portion of the radiator 1, and a radiator hose 13 is fitted into the cooling water outlet 11. The radiator hose 13 extends slightly from the cooling water outlet 11 toward the rear side of the vehicle, and then extends between the cooling fan 3A and the turbine 9A of the supercharger 9 as shown in FIG. It extends upward along. Further, the radiator hose 13 is extended so as to partition between the turbine 9A of the supercharger 9 and the compressor 9B when extending upward.
The radiator hose 13 extends toward the rear of the vehicle again near the top of the cooling fan 3 </ b> A, and is connected to the engine 5.

An oil pipe 15 for lubricating the supercharger 9 is attached to the turbine 9A of the supercharger 9 so as to extend substantially vertically, and the oil pipe 15 extends along the outer periphery of the cooling fan 3A. It is arranged so as to be located behind the extended radiator hose 13. The supercharger cooling structure according to the present embodiment having the above-described configuration operates as follows.

Since the radiator hose 13 extends along the outer periphery of the cooling fan 3A and extends so as to partition between the turbine 9A and the compressor 9B, the air flow from the cooling fan 3A flows toward the compressor 9B. Does not go, and almost all the air flow goes to the turbine 9A. Although the temperature of the airflow that has passed through the cooling fan 3A has been slightly increased by passing through the radiator 1, the temperature is lower than the temperature of the turbine 9A, and thus the turbine 9A is cooled by the airflow from the cooling fan 3A.

As described above, by disposing the turbine 9A behind the cooling fan 3A and extending the radiator hose 13 which is always required as one part of the engine as in this embodiment, one cooling fan 3A Only allows the turbine 9A of the supercharger 9 to be effectively cooled. On the other hand, the compressor 9B is
Not as high as A, the temperature of the compressor 9B is
The temperature of the air flow from the cooling fans 3A and 3B heated by passing through the radiator 1 is lower than the temperature. For this reason, it is necessary to prevent the air flow from the cooling fans 3A and 3B from hitting the compressor 9B.
In this embodiment, since the compressor 9B is disposed between the two cooling fans 3A and 3B, it does not directly receive the airflow from the two cooling fans 3A and 3B. Furthermore, since the air flow from cooling fan 3B does not go to turbine 9A by radiator hose 13 extending along the outer periphery of cooling fan 3A, compressor 9B is not heated by the air flow from cooling fan 3B. That is, the compressor 9B has two cooling fans 3
It is not heated by the air flow from A and 3B.

The oil pipe 15 is connected to the turbine 9A.
Is disposed behind the radiator hose 13 extending along the outer periphery of the engine room 2, even if an external force acts on the engine room 2 from the front at the time of a vehicle collision or the like, the external force acts on the radiator hose 13 first. Therefore, it is possible to prevent the oil pipe 15 from being damaged.

[0018]

According to the supercharger cooling structure according to the present invention,
The supercharger can be effectively cooled only by appropriately arranging the existing components without requiring a complicated structure and without providing a new cooling structure.

[Brief description of the drawings]

FIG. 1 is a plan view of a supercharger cooling structure according to the present invention.

FIG. 2 is a front view of FIG.

[Explanation of symbols]

 Reference Signs List 1 radiator 2 engine room 3A, 3B cooling fan 5 engine 7 exhaust manifold 9 turbocharger 9A turbine 9B compressor 13 radiator hose 15 oil pipe

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Hiroshi Kitano 3-1 Shinchi, Fuchu-cho, Aki-gun, Hiroshima Mazda Co., Ltd. (58) Field surveyed (Int. Cl. ⁷ , DB name) F02B 39/00 F01M 11/02 F01P 1/06 F01P 5/02

Claims (2)

(57) [Claims] 1. A structure for cooling a supercharger disposed behind a radiator, wherein the radiator has two cooling fans mounted on a rear side thereof in parallel in a vehicle width direction. The machine is arranged such that its compressor side is located between two cooling fans and its turbine side is located behind one of the cooling fans when viewed from the front, and the radiator hose taken out of the radiator is:
Between the one cooling fan and the supercharger, extending along the outer periphery of the one cooling fan in front view and partitioning the compressor side and the turbine side of the supercharger. There is a supercharger cooling structure. 2. The supercharger lubricating oil pipe is disposed between the supercharger and the radiator hose so as to be located behind the radiator hose. Supercharger cooling structure.