JP2007023905A - Engine oil cooling device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To miniaturize an oil cooler and miniaturize an engine and reduce hazardous material contained in exhaust gas and improve duel consumption rate. <P>SOLUTION: This engine oil cooling device has an engine oil cooling pipe installed in an intake manifold of the gasoline engine. The engine oil cooling pipe can be a serpentine type radiator. Hot-dip aluminum plating or nickel plating can be applied on a surface of the engine oil cooling pipe. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an engine oil cooling system for an air-cooled or water-cooled gasoline engine.

In recent years, in order to increase the output of an internal combustion engine, a system in which intake air is pressurized with a supercharger and pressurized air is cooled with an intercooler to increase the charging efficiency of the combustion chamber has been used. In this type of internal combustion engine, for example, as shown in FIG. 4, an intake manifold 2 for supplying intake air to each cylinder is connected to the side surface of the engine body 1, and exhaust gas discharged from each cylinder is connected to the other side surface. An exhaust manifold 3 that joins and flows downstream is connected.
The intake manifold 2 extends an intake pipe 9 that forms a ventilation path toward an air cleaner 5 at the upstream end, and an intercooler 4, a compressor 7 of a supercharger 6, and a throttle valve 8 are sequentially arranged on the intake manifold 2.

On the other hand, a gasoline engine is generally equipped with a radiator or an oil cooler that cools the engine oil circulating for the purpose of lubricating or cooling the engine by heat exchange with outside air or engine cooling water. is there. FIG. 5 shows the configuration of a conventional engine oil cooling system for an engine. Since an engine oil cooling system for a gasoline engine performs cooling by exchanging heat with outside air, as shown in FIG. 5, it is common to install an oil cooler 31 in a place where it is easily exposed to outside air, that is, outside the engine body 1. is there. For example, a method is used in which an oil cooler 31 that is an independent part is provided in a pumping flow path downstream of an oil pump 32 that pumps engine oil, and the oil cooler 31 is cooled by cooling air generated by a blower 33.
In addition to the side surface of the engine block (see, for example, Patent Document 1), the oil cooler is installed in an oil pan (see, for example, Patent Document 2). Further, in order to shorten the pipe length to the oil cooler, a method of providing between cylinder blocks (see, for example, Patent Document 3) or a corner of a cylinder head (for example, see Patent Document 4) is proposed. Has been.
JP 2001-132556 A Japanese Patent Laid-Open No. 11-22461 JP-A-5-86858 Japanese Utility Model Publication No. 2-26725

In the case of an oil radiator or oil cooler of the above type, since it is installed outside the engine, piping to the oil cooler is required, and the structure of engine auxiliary equipment becomes very complicated. In addition, since the flow rate of outside air to the radiator is not so fast, the heat exchange efficiency is low, and the flow condition is not always stable, so it is necessary to allow sufficient margin for the cooling capacity of the oil cooler. There is a problem that the oil cooler itself cannot be increased in size.
Further, the method of providing the space between the cylinder blocks or in the corners of the cylinder head makes the structure complicated and difficult to make, and goes against the downsizing of the engine.
In the engine oil cooling system of an air-cooled or water-cooled gasoline engine, the present invention reduces the size of the oil cooler, further reduces the size of the engine, and at the same time reduces the harmful substances contained in the exhaust gas and improves the fuel consumption rate. It aims to plan.

In order to achieve the above object, the present invention provides an engine oil cooling device in which an engine oil cooling pipe is installed in an intake (intake) manifold of a gasoline engine.
If an engine oil cooling pipe is installed in the intake (intake) manifold, the engine oil cooling pipe will always collide with wind at a wind speed above a certain level as long as the engine is running. Will be obtained. In addition, fuel that is incompletely vaporized is vaporized when it collides with the engine oil cooling pipe installed in the intake (intake) manifold, so that the engine oil is cooled by the latent heat of vaporization and the fuel in the cylinder The combustion state is improved, and the improvement of fuel consumption efficiency and the reduction of harmful impurities contained in the exhaust gas are promoted.

In the engine oil cooling device of the present invention, the engine oil cooling pipe having fins can be used. Alternatively, an engine oil cooling device that is a serpentine type radiator may be used as the engine oil cooling pipe.
Heat exchange efficiency can be increased by using an engine oil cooling pipe with fins. The form of the fin may be a serpentine-type radiator in which the fin is attached to a meandering pipe in addition to simply attaching the fin to the pipe.

In the engine oil cooling device of the present invention, it is preferable that the surface of the engine oil cooling pipe is subjected to hot-dip aluminum plating, hot-dip galvanization or nickel plating.
This is to increase the corrosion resistance against the vaporized atmosphere containing fuel.

Furthermore, in the engine oil cooling device of the present invention, the gasoline engine is preferably a stationary gasoline engine.
Since the stationary gasoline engine is always operated at a constant rotational speed, a constant wind speed is supplied to the surface of the engine oil cooling pipe, so that a stable cooling effect is maximized.

  According to the present invention, in an engine oil cooling system for an air-cooled or water-cooled gasoline engine, the oil cooler is further downsized, and further the engine is downsized, and at the same time, the harmful substances contained in the exhaust gas are reduced and the fuel consumption rate is reduced. Greatly effective in improving

Hereinafter, the present invention will be described in detail with reference to the drawings.
FIG. 1 shows a schematic configuration of the engine oil cooling system of the present invention. The engine oil cooling system of the present invention is an engine oil cooling device in which an engine oil cooling pipe is installed in an intake (intake) manifold of a gasoline engine. In other words, an intake manifold 2 for supplying intake air to each cylinder in a branched manner is connected to the side surface of the engine body 1, and an exhaust manifold 3 for connecting exhaust gas discharged from each cylinder to flow downstream is connected to the other side surface. ing.

  At the upstream end of the intake manifold 2, an intake pipe 9 that forms a ventilation path toward the air cleaner is extended, and in addition to the throttle valve 8, an intercooler (not shown), a supercharger compressor, and the like are sequentially arranged. ing. The oil pan of the engine body 1 is filled with engine oil for the purpose of lubricating or cooling the engine body, and the engine oil heated by the engine body is pressurized by the engine oil pump 32 through the engine oil flow passage 30. Then, the pressure is fed to the engine oil cooling pipe 11 disposed in the intake manifold 2. The surface of the engine oil cooling pipe 11 disposed in the intake manifold 2 is cooled by exchanging heat with the pressurized air flowing in the intake manifold 2.

By adopting such an engine oil cooling system, the piping to the oil cooler can be shortened and the design around the engine including the auxiliary equipment can be simplified, contributing to the downsizing of the engine. .
Also, if incompletely vaporized pressurized air remains in the intake manifold, the unvaporized fuel is heated by the oil cooler in the intake manifold and completely vaporized, which is harmful to the exhaust gas. It can contribute to reduction of substances and improvement of fuel consumption rate. In addition, winter icing can be prevented.

(First embodiment)
FIG. 2 shows a schematic configuration of the engine oil cooling device according to the first embodiment of the present invention.
The engine oil cooling device of the first embodiment shows an example in which fins 12 are attached to an engine oil cooling pipe 11. The engine oil cooling pipe 11 can use a steel pipe, a copper pipe, an aluminum pipe or the like having a small diameter. The engine oil cooling pipe 11 may be simply pierced through these thin pipes or may be arranged to meander several times depending on the required cooling capacity and the situation of the installation location.
Further, these thin tubes may be provided with heat dissipation fins 12 attached thereto. As the heat radiation fin 12, for example, a so-called corrugated fin in which a thin aluminum ribbon is wound in a spiral shape or bent in a zigzag manner can be used.
In FIG. 2, an engine oil cooling pipe 11 with spiral fins 12 is provided across the intake manifold 2. The intake manifold 2 sucks in the pressurized air 40 from the intake pipe 9, mixes fuel from the captor, mixes it as mixed air 41, adjusts the flow rate by the throttle valve 8, and distributes it to each cylinder.
Therefore, in this type of engine, as long as the engine is operated, there is a flow of mixed air in the intake manifold 2, and the flow of mixed air always hits the engine oil cooling pipe 11 disposed in the intake manifold 2. Will be. It can be used for gas engines such as LPG and CNG, and can be non-supercharged (non-turbo).

(Second Embodiment)
FIG. 3 shows a schematic configuration of an engine oil cooling apparatus according to the second embodiment. The difference between the engine oil cooling device of the present embodiment and the engine oil cooling device according to the first embodiment is that the engine oil cooling pipe 11 is a serpentine radiator. The serpentine type radiator has a structure in which metal thin tubes having good heat conduction are bent in a bellows shape and the thin tubes are connected by corrugated fins. The serpentine radiator is generally made of an aluminum alloy. This is because if it is made of an aluminum alloy, the heat conductivity is high and the heat exchange efficiency is improved, and it can be easily processed using a brazing sheet using a solder alloy. If a serpentine radiator is used, the heat exchange area can be increased. Therefore, the heat radiation area may be increased as long as the space in the intake manifold 2 allows.

As described above, the engine oil cooling pipe used in the engine oil cooling device of the present invention can use a steel pipe, a copper pipe, an aluminum pipe or the like having a small diameter. By using a corrosion-resistant aluminum alloy, the aluminum tube exhibits considerable corrosion resistance in a mixed air atmosphere containing sulfur (S). However, in order to further exhibit corrosion resistance, it is possible to use a zinc tube hot-plated surface of a thin tube. Corrosion resistance can be improved by using steel pipes and copper pipes that are obtained by hot-plating aluminum or zinc on the surface of the thin pipes. Hot dipping is performed by submerging the capillary tube in a bath of aluminum, zinc or alloy.
Furthermore, nickel plating is also effective for seeds that increase the corrosion resistance of thin tubes. For nickel plating, electrolytic plating or electroless plating can be used. In addition, you may implement these surface treatments after providing a fin.

  The engine oil cooling device of the present invention is particularly effective when placed on a stationary engine. In general, a stationary engine is operated at a constant output for a long time, so that a constant mixed air flow is generated and the engine oil cooling capacity is likely to be constant.

By configuring the engine oil cooling device as described above, the oil cooler and the engine can be downsized, and at the same time, the harmful substances contained in the exhaust gas can be reduced and the fuel consumption rate can be improved. Will be able to.
Although the above embodiment has been described by taking the case where it is applied to an L-type engine as an example, it goes without saying that the present invention can also be applied to a V-type engine and a horizontally opposed engine.

It is a figure explaining the structure of the engine oil cooling device of this invention. It is a figure explaining the composition of the engine oil cooling device concerning a 1st embodiment. It is a figure explaining the structure of the engine oil cooling device concerning 2nd Embodiment. It is a figure explaining an engine system with a supercharger. It is a figure explaining the structure of the conventional engine oil cooling device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Engine main body 2 Intake manifold 3 Exhaust manifold 4 Intercooler 5 Air cleaner 6 Supercharger 7 Compressor 8 Throttle valve 9 Intake pipe 10 Serpentine type radiator 11 Engine oil cooling pipe 12 Fin 30 Oil piping 31 Oil cooler 32 Oil pump 33 Blower 41 Pressurized air 42 Mixed air

Claims (5)

  An engine oil cooling system comprising an engine oil cooling pipe installed in an intake (intake) manifold of a gasoline engine.   The engine oil cooling device according to claim 1, wherein the engine oil cooling pipe includes fins.   The engine oil cooling device according to claim 1, wherein the engine oil cooling pipe forms a serpentine type radiator.   The engine oil cooling device according to any one of claims 1 to 3, wherein a surface of the engine oil cooling pipe is subjected to hot-dip aluminum plating, hot-dip galvanization, or nickel plating. The engine oil cooling device according to any one of claims 1 to 4, wherein the gasoline engine is a stationary gasoline engine.

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