JPS6145295Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of an intake duct device for a supercharged internal combustion engine.

An example of a conventional intake duct device for an internal combustion engine with a supercharger is shown in FIG.
(Japanese Utility Model Publication No. 56-133928) This includes a first intake duct 2 that extends in the vehicle width direction to introduce intake air into the air cleaner 1 from the outside, and a first intake duct 2 that extends from the air cleaner 1 to the exhaust manifold 3 to reduce engine exhaust gas pressure. supercharger 4 driven by
a second intake duct 5 that sends intake air to the supercharger 4;
and a discharge duct 8 extending in the vehicle width direction to send pressurized intake air to an intake manifold 7 located on the opposite side of the fuselage main body 6, and these intake ducts 2, 5, and 8 act as independent intake passages. They are installed separately in the engine room, etc.

However, in the case of such a conventional intake duct device, since the above-mentioned intake ducts 2, 5, and 8 were arranged separately,
At least two intake ducts 5 and 8 have to be passed through the engine room, which has limited space, and this creates a problem in that the engine room becomes cluttered and the space cannot be used effectively.

Further, since the discharge duct 8 is located in the engine room and does not have any cooling means, the intake air flowing through the discharge duct 8 is pressurized by the supercharger 4 and increases in temperature, and the hot air in the engine room further increases the temperature. There was also the problem that the engine became warmer, which reduced engine output.

This invention was made by focusing on such conventional problems, and it is made by combining a part of the above-mentioned discharge duct with at least one of the first and second suction ducts to form a double pipe of a predetermined length. By forming the structure, it is possible to simplify the engine room and make effective use of space, as well as exchange heat between the intake air flowing through the discharge duct and the intake air or outside air flowing through the first or second intake duct to lower the temperature of the engine. The purpose is to improve output.

Hereinafter, embodiments of this invention will be described based on the drawings.

As shown in FIGS. 2 and 3, in this embodiment, an intermediate portion 8A extending in the vehicle width direction of the discharge duct 8 connecting the supercharger 4 and the intake manifold 7 is extended outside the engine room, and The first suction duct 2 which introduces intake air into the air cleaner 1 from the outside is overlaid over a predetermined length on the outside of the intermediate portion 2A, which also extends in the vehicle width direction, with a diameter slightly larger than that of the portion, and These intermediate parts 8A, 2A
A double tube structure is formed between the two.

In other words, the above-mentioned intermediate section 2A of the first suction duct 2 is connected to the air cleaner 1 after passing through the interior of the intermediate section 8A of the discharge duct 8 over a predetermined length in a sealed state.

Therefore, in the intermediate portion 8A of the discharge duct 8, the intake air flowing through the portion 8A is transferred to the first suction duct 2.
The water flows through an annular space B defined around the outer periphery of the intermediate portion 8A.

The rest of the structure is the same as in FIG. 1, so the same members as in FIG. 1 are given the same reference numerals and detailed explanations will be omitted.

Due to this configuration, the intake air sucked through the first intake duct 2 passes through the air cleaner 1 and is sucked into the supercharger 4 through the second intake duct 5. and,
The system in which high-temperature intake air pressurized by the supercharger 4 is drawn into the intake manifold 7 through the discharge duct 8 is the same as that shown in FIG.

However, in this embodiment, the intermediate section 8A of the discharge duct 8 is extended outside the engine room where it comes into contact with the outside air, and the intermediate section 2A of the first intake duct 2, through which cool intake air flows, is extended to a predetermined length. Since the pressurized intake air flowing through the discharge duct 8 undergoes double heat exchange between the intake air and the outside air at the intermediate portion 8A of the duct 8, its temperature is significantly lowered.

By lowering the temperature of the intake air pressurized by the supercharger 4 in this way, the filling efficiency into the engine is increased (by increasing the mass flow rate), and the output is improved.

Furthermore, the above-mentioned double pipe structure between the intake ducts 2 and 8 simplifies the interior of the engine room, which has the advantage of making effective use of space and facilitating maintenance work on engine parts.

In the above embodiment, a double pipe structure is formed between the discharge duct 8 and the first suction duct 2, but it is also possible to form a double pipe structure between the discharge duct 8 and the second suction duct 5. Not until now. In addition, the one-dot chain line A in Figure 2 is the boundary line indicating the inside and outside of the engine room.
The first suction duct 2 and the discharge duct 8 are overlapped to form a double pipe structure, with the portion directly in contact with the outside air, further improving the cooling effect.

As explained above, according to this invention, in the intake duct device of a supercharged internal combustion engine, a part of the discharge duct is overlapped with at least one of the first and second intake ducts, and a double portion of a predetermined length is formed. Since the pipe structure is formed, the engine room can be simplified and the space can be used effectively, and the temperature of the pressurized intake air flowing through the discharge duct can be lowered to improve the output of the engine.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of the conventional example, Fig. 2 is a schematic diagram of the embodiment of this invention, and Fig. 3 is the A of Fig. 2.
-A cross-sectional view. 1... Air cleaner, 2... First intake duct,
4...Supercharger, 5...Second intake duct, 7...Intake manifold, 8...Discharge duct, 2A, 8A
...middle part, b... annular space.

Claims (1)

[Scope of utility model registration request] A supercharger consisting of a first intake duct that introduces intake air from the outside into the air cleaner, a second intake duct that sends intake air from the air cleaner to the supercharger, and a discharge duct that sends pressurized intake air from the supercharger to the intake manifold. In the intake duct device of an internal combustion engine,
An intake duct for an internal combustion engine with a supercharger, characterized in that a part of the discharge duct is overlapped with at least one of the first and second intake ducts to form a double pipe structure of a predetermined length. Device.