JP3525419B2 - Intake device for supercharged engine - Google Patents

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 engine with a supercharger, and more particularly to an intake system for an engine with a supercharger in which a supercharger and an intercooler are provided in an intake passage.

[0002]

2. Description of the Related Art Conventionally, there has been known one in which intake pressure is increased by a supercharger to increase the specific weight of the air-fuel mixture and increase its packing density to increase the output of the engine. When a supercharger is used, an intercooler is provided to lower the air temperature after pressurization and further increase the supercharging pressure.

[0003]

This supercharger is, for example, a V
When mounted on an engine having a relatively complicated structure such as a model engine and mounted in an engine room, various layout restrictions are imposed. In order to solve this layout limitation, the intake passage with the supercharger and the intercooler is divided in the longitudinal direction, and an elastic body such as rubber is provided in this divided portion to prevent assembly errors due to this elastic body. By absorbing, it is possible to lay out the intake passage at an optimum position. Generally, the intake passage is made of a metal such as aluminum. However, when the intake passage configured to include rubber other than the metal is used, the following problems occur. That is, the engine and the supercharger each have an order (the number of stimulations per rotation), and the intake passage has its own natural frequency. Therefore, when the order of the engine and the supercharger and the natural frequency of the intake passage match, resonance occurs in the intake passage to generate noise. Here, when the intake passage is made of only metal, the sound insulation performance of the metal is high, so noise generated by this resonance is blocked by the metal, and leakage of radiated sound to the outside of the intake passage becomes a problem. Is few. On the other hand, when the intake passage configured to include rubber other than metal is used, the rubber has considerably lower sound insulation performance than metal,
There arises a problem that noise is generated from the rubber portion as radiated sound outside the intake passage. Therefore, if the intake passage is divided due to layout problems in the engine room and an elastic body such as rubber is provided in this division, it is necessary to provide some means for preventing the emission of sound from this elastic body. There is.

On the other hand, for example, Japanese Patent Laid-Open No. 61-223223.
In Japanese Patent Laid-Open Publication No. JP-A-2003-264, there is known one in which chambers (resonators) are provided on the upstream side and the downstream side of the supercharger in order to reduce the pulsating noise generated from the supercharger itself. However, the one described in this publication is for reducing the pulsating noise generated from the supercharger itself, and does not solve the above problems. Therefore, even if the chamber described in this publication is simply applied to the intake passage configured to include a rubber other than metal, the order of the engine and the supercharger and the natural frequency of the intake passage match. It is not possible to prevent the emitted sound. Therefore, the present invention has been made in order to satisfy the above-described conventional demands, and by adopting a divided structure of the intake passage via an elastic body, it is possible to absorb an assembly error and to prevent the intake passage from being damaged. It is an object of the present invention to provide an intake system for an engine with a supercharger that can reduce the generation of radiated sound from an elastic body by reducing the resonance of the.

[0005]

To achieve the above object, the present invention is an intake system for an engine with a supercharger in which a supercharger and an intercooler are provided in the intake passage. The intake passage is divided in the longitudinal direction. At the same time, the divided parts are connected by an elastic body, and a resonator for preventing the order of the engine and the supercharger from matching with the natural frequency of the intake passage is provided in the intake passage of the supercharger or in the vicinity thereof. The intake passage is formed by two intake passages provided in the V-type engine and having different intake pipe lengths, and the capacity of the resonator is set to the middle of the natural frequency of each of the two intake passages. It is characterized by doing so. In the present invention thus constituted, first, the intake passage is divided in the longitudinal direction and the divided portions are connected by the elastic body, so that the elastic body can absorb the assembly error. Further, by providing a resonator in the discharge passage of the supercharger or in the intake passage in the vicinity thereof, the order of the engine and the supercharger and the natural frequency of the intake passage do not match. As a result, resonance in the intake passage is reduced,
This reduces the generation of radiated sound from the elastic body. Further, resonance in the intake passage is reduced, which reduces the generation of radiated sound from the elastic body.

Another aspect of the present invention is an intake system for an engine with a supercharger in which an intake passage is provided with a supercharger and an intercooler. The intake passage is divided in the longitudinal direction and the divided portion is made of an elastic body. Connected to the discharge port of the supercharger or an intake passage in the vicinity thereof, a resonator for disabling the order of the engine and the supercharger from the natural frequency of the intake passage is provided. It is composed of two intake passages having the same intake pipe length provided in the engine, and the discharge port of the supercharger is directed to one bank of the V-type engine. With this configuration, resonance in the intake passage is reduced, and as a result, generation of radiated sound from the elastic body is reduced. Furthermore, since the discharge port of the supercharger is directed to one bank of the V-type engine, the distance in the height direction is shortened, and the size can be reduced. Further, in the present invention, the supercharger is preferably an internal compression type mechanical supercharger.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is an overall configuration diagram showing an embodiment of an intake device for an engine with a supercharger of the present invention. As shown in FIG. 1, reference numeral 1 denotes an intake passage. In the intake passage 1, an intake air amount is linked from an upstream side to an air filter 2 for cleaning intake air and an accelerator pedal (not shown). A throttle valve 4 for adjusting, a mechanical supercharger 6 for pressurizing intake air, and an intercooler 8 for cooling intake air pressurized by the mechanical supercharger 6 are arranged. An intake manifold 10 and an engine 12 are arranged downstream of the intercooler 8 located on the most downstream side of the intake passage 1. An internal compression type supercharger is used for the mechanical supercharger 6. The mechanical supercharger 6 is directly connected to a crankshaft (not shown) of the engine 12 via a belt, and rotates in synchronization with the engine rotation. Also, this intake passage 1
Has a divided structure in the longitudinal direction, and the rubber 14 and the rubber 16 which are elastic bodies make the intake passage 1 and the intake manifold 10 respectively on the upstream side and the downstream side of the intercooler 8.
It is connected to the. As described above, the intake passage 1 is divided in the longitudinal direction and the divided portions are connected by the rubbers 14 and 16. Therefore, when the engine 12 is arranged in the engine room, the rubbers 14 and 16 prevent an assembly error. Since it can be absorbed, the degree of freedom in layout is increased.

Further, the mechanical supercharger 6 of the intake passage 1
The discharge port 18 is provided with a resonator 20.
The resonator 20 includes the rubber 14, 16 of the intake passage 1.
This is to reduce the generation of radiated sound from. Further, the mounting position of the resonator 20 is most preferably the discharge port 18 of the mechanical supercharger 6, but the position is not limited to this, and substantially the same effect can be obtained near the discharge port 18. Next, the operation of this embodiment will be described. As shown in FIG. 2, when the intake passage 1 is not provided with the resonator 20,
The intake air pressurized and discharged from the mechanical supercharger 6 vibrates at a frequency based on the order of the mechanical supercharger 6. Figure 2
The chain line inside shows the vibration mode based on the order of this mechanical supercharger 6, and the point A shows its antinode and the point N shows its node. Here, as described above, the order means the number of stimulations per one rotation, and in the case of the supercharger 6, the number of discharges of intake air per one rotation of the supercharger.
Further, in this embodiment, since the mechanical supercharger 6 and the engine 12 are directly connected, their orders are the same. When the rotation speed of the mechanical supercharger 6 changes, that is, when the order changes, the vibration mode also changes, and the positions of the antinode and the node in the vibration mode move. Therefore, the antinode A in the vibration mode is
As shown in FIG. 2, when it comes to the position of the rubber 14 which is the divided portion, it resonates with the natural frequency of the intake passage 1 itself, and this resonance sound leaks from the rubbers 14 and 16 as radiation sound to the outside.

In this embodiment, the discharge port 18 of the mechanical supercharger 6 is used.
This is done by paying attention to the fact that, as shown in FIG. 2, the antinode A of the vibration mode based on the order of the mechanical supercharger 6 always comes to the position of. That is, in the present embodiment, the resonator 20 is provided at the discharge port 18 of the mechanical supercharger 6 in the intake passage 1,
In the portion of the resonator 20, the natural frequency of the intake passage 1 itself and the frequency based on the order of the mechanical supercharger 6 are in opposite phases. As a result, the mechanical supercharger 6
It is possible to prevent the frequency based on the order and the natural frequency of the intake passage 1 itself from resonating with each other, thereby reducing the generation of radiated sound at the rubber portion 14. Next, another embodiment of the present invention will be described with reference to FIGS. In this embodiment, the present invention is applied to a V type 6 cylinder engine. As shown in FIGS. 3 and 4,
The engine 30 is a V-type 6-cylinder engine having a right bank 32 and a left bank 34 (see FIG. 3), and each bank has three cylinders. A mechanical supercharger 36 is axially arranged in the space between the banks 32 and 34. The mechanical supercharger 36 has an intake port 38 on the side surface located on the right side in FIG. 3, and has a discharge port 40 on the upper side thereof. At the discharge port 40 of this mechanical supercharger 36,
A resonator 44 is provided while being connected to the intake passage 42. This intake passage 42 has two
The two intake passages 42a and 42b,
a is the intercooler 46 of the right bank 32, and the intake passage 42b is the intercooler 48 of the left bank 34.
, Respectively. A part of the intake passage 42 on the upstream side of the branch portion has a divided structure in which it is connected by the first rubber 50, and further, a part of the intake passage 42b on the downstream side of the branch portion is the second portion. It has a divided structure in which it is connected by a rubber 52.

In this embodiment, the intake passages 42a on the right bank side and the intake passages 42b on the left bank side are different in length, so that the respective intake passages 42a, 42a are provided.
The natural frequencies of b are different from each other. In the present embodiment, in order to reduce the resonance in the intake passages 42a, 42b, the capacity of the resonator 44 is set to an intermediate value between the natural frequencies of the two intake passages 42a, 42b having different lengths. I have to. In this embodiment, since the capacity of the resonator 44 is set in this way,
A single resonator can simultaneously reduce the resonance in the two intake passages 42a and 42b having different lengths, and as a result, the first rubber 50 and the second rubber 52 can be reduced.
It is possible to reduce the generation of radiated sound from. Next, another embodiment of the present invention will be described with reference to FIG. This embodiment also applies the present invention to a V-type 6-cylinder engine, like the embodiment shown in FIGS. 3 and 4. Therefore, only parts different from the embodiment shown in FIGS. 3 and 4 will be described. First, in this embodiment, the intake passage 60
Is composed of two intake passages 60a and 60b, and the intake passages 60b of the right bank 32 are offset by a predetermined amount L so that the intake passages 60a and 60b have the same length. Further, the discharge port 64 of the mechanical supercharger 62 is arranged so as to be directed toward the right bank 32 of the V-type engine.

Therefore, in this embodiment, since the two intake passages 60a and 60b have the same length, their natural frequencies are the same. Therefore, the resonator 66 in this embodiment is set to a capacity such that the orders of the engine and the supercharger do not match the natural frequency of the intake passage. In this embodiment, the two intake passages 60a,
Since the lengths of 60b are the same, the single resonator 66 allows the two intake passages 60a, 6
It is possible to reduce the resonance at 0b, and as a result, it is possible to reduce the generation of radiated sound from the first rubber 50 and the second rubber 52. Furthermore, the mechanical supercharger 6
Since the two discharge ports 64 are arranged so as to be oriented in the direction of the right bank 32 of the V-type engine, the distance in the height direction can be reduced and the size can be reduced.

[0012]

As described above, according to the intake system for the engine with the supercharger of the present invention, the intake passage is of the divided structure through the elastic body, so that the assembling error can be absorbed and the intake By reducing the resonance in the passage, it is possible to reduce the generation of radiated sound from the elastic body.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of an intake device for an engine with a supercharger of the present invention.

FIG. 2 is a reference diagram for explaining the operation of one embodiment of the present invention.

FIG. 3 is a plan view showing another embodiment of the intake device for the engine with the supercharger of the present invention.

FIG. 4 is a side view showing another embodiment of the present invention shown in FIG.

FIG. 5 is a plan view showing another embodiment of the intake device for the engine with the supercharger of the present invention.

[Explanation of symbols]

1 Intake passage 6 Mechanical supercharger 8 intercooler 12 engine 14,16 Rubber (elastic body) 18 Mechanical turbocharger outlet 20 Resonator 30 V engine 32, 34 banks 36 Mechanical supercharger 40 Mechanical turbocharger outlet 42 Intake passage 44 Resonator 46,48 Intercooler 50,52 rubber 60 intake passage 62 Mechanical supercharger 64 Mechanical supercharger discharge port 60 Resonator

─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Masanari Ota 3-1, Shinchi Fuchu-cho, Aki-gun, Hiroshima Mazda Co., Ltd. (56) References -165929 (JP, U) Actual development Sho 62-171619 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) F02M 35/12 F02B 33/44

Claims (3)

(57) [Claims] 1. An intake system for an engine with a supercharger having an intake passage provided with a supercharger and an intercooler, wherein the intake passage is divided in a longitudinal direction and the divided portion is connected by an elastic body. In the intake passage of the engine or in the vicinity thereof, a resonator is provided to prevent the order of the engine and the supercharger from matching with the natural frequency of the intake passage. The intake passage is an intake passage provided in a V-type engine. An intake device for an engine with a supercharger, comprising two intake passages having different pipe lengths, wherein the capacity of the resonator is set to the middle of the natural frequency of each of the two intake passages. 2. An intake system for a supercharged engine having an intake passage provided with a supercharger and an intercooler, wherein the intake passage is divided in a longitudinal direction, and the divided portion is connected by an elastic body. In the intake passage of the engine or in the vicinity thereof, a resonator is provided to prevent the order of the engine and the supercharger from matching with the natural frequency of the intake passage. The intake passage is an intake passage provided in a V-type engine. An intake device for an engine with a supercharger, comprising two intake passages having the same pipe length, wherein the discharge port of the supercharger is directed to one bank of a V-type engine. 3. The intake system for an engine with a supercharger according to claim 1, wherein the supercharger is an internal compression type mechanical supercharger.