JPH06108942A - Intake noise reducing device for internal combustion engine with supercharger - Google Patents

Abstract

PURPOSE:To provide an intake noise reducing device for an internal combustion engine with a supercharger enabling space saving in the V-type engine. CONSTITUTION:A resonator 13 serving as an intake noise reducing device is formed between the lateral banks of a V-type engine 1. Both side parts in the vehicle width direction of the resonator 13 are demarcated by the lateral banks 3A, 3B, the upper face of the resonator is demarcated by the bottom face 11 of a supercharger 5, and both side parts in the vehicle longitudinal direction of the resonator 13 are demarcated by rib members 17A, 17B for connecting-reinforcing the lateral banks 3A, 3B. The resonator 13 can be thereby formed by disposing existing components appropriately without providing new constitution for the resonator 13, which results in saving space.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for reducing intake noise of an internal combustion engine equipped with a supercharger.

[0002]

2. Description of the Related Art In an engine equipped with a supercharger, the discharge noise of the supercharger is one of the causes of engine noise. For this reason, it is generally practiced to arrange a resonator in the intake passage downstream of the supercharger and reduce the discharge noise of the supercharger by using this resonator (for example, the actual opening 5).
9-165929).

[0003]

When an engine having a relatively large space such as a V-type engine is installed, the space of the entire engine room is limited. Therefore, parts other than the engine are saved as much as possible. Space saving is required. Therefore, the smaller the space required for the resonator, the more preferable, and it is more preferable that the existing component can have the function of the resonator without providing the resonator itself.

The present invention has been made in view of the above circumstances, and a supercharger is disposed between the left and right banks of a V-type engine, and a resonator is connected to an intake passage downstream of the supercharger. It is an object of the present invention to provide an intake noise reduction device for an internal combustion engine with a turbocharger, which requires a small space for installing a resonator.

[0005]

In order to achieve this object, in the intake noise reduction device for an internal combustion engine with a supercharger according to the present invention, the resonator itself is not newly provided, but inside the left and right banks of the V-type engine. The circumference of the resonator is demarcated by the cylinder block wall and the bottom surface of the supercharger to form a space as the resonator.

Specifically, in the intake noise reduction device for an internal combustion engine with a supercharger according to the present invention, a resonator is arranged between the left and right banks of the V-type engine, and the side surface of the resonator is provided on the left and right sides of the V-type engine. It is characterized in that it is constituted by the cylinder block wall portion of the bank. In a preferred embodiment, the lower surface of the resonator is constituted by wall portions connecting the cylinder block wall portions of the left and right banks.

In a preferred embodiment, the top surface of the resonator further comprises the bottom surface of the supercharger. In a preferred embodiment, the side surface of the resonator is formed by a rib member that connects the left and right banks of the V-type engine. In another aspect of the intake noise reduction device for an internal combustion engine with a supercharger according to the present invention, the discharge port of the supercharger is opened between the left and right banks, and the resonator is arranged between the left and right banks of the V-type engine. However, the side surface portion of the resonator is constituted by the cylinder block wall portions of the left and right banks of the V-type engine.

Also in this aspect, the lower surface of the resonator is constituted by the wall portion connecting the cylinder block wall portions of the left and right banks, the upper surface of the resonator is constituted by the bottom surface of the supercharger, and the side portion of the resonator is constituted by the V type engine. It can be configured by a rib member that connects the left and right banks.

[0009]

1 to 3 show an embodiment of an intake noise reducing device for an internal combustion engine with a supercharger according to the present invention. As shown in FIG. 2, a supercharger 5 is disposed above the left and right banks 3A and 3B of the V-type engine 1. The supercharger 5 uses the kinetic energy of the exhaust gas to pressurize the intake air and send it to the combustion chamber.

As shown in FIG. 1, the discharge port 7 for sending out the pressurized intake air in the supercharger 5 is opened downward between the left and right banks 3A and 3B. An intake passage 9 is connected to the discharge port 7. The intake passage 9 extends slightly downward from the discharge port 7 and then extends toward the front of the vehicle. The intake air pressurized in the supercharger 5 is sent out from the supercharger 5 through the intake passage 9. , Through an intercooler (not shown) into each V type engine.

A support plate 11 is attached to the bottom of the supercharger 5 alongside the discharge port 7 at the rear of the discharge port 7. As shown in FIG. 2, the support plate 11 has a length narrower than that of the supercharger 5 in the vehicle width direction. As will be described later, the length of the resonator 13 in the vehicle width direction is the vehicle width direction of the support plate 11. Is defined by the length of. Further, the support plate 11 is attached so as to project rearward of the vehicle from the rear end of the supercharger 5, as shown in FIG. The support plate 11 is attached to the part 1A of the cylinder block at this protruding portion, whereby the rear portion of the supercharger 5 is supported.

A resonator 13 is formed below the supercharger 5. The resonator 13 is connected to the intake passage 9 via a communication passage 15 on the slightly downstream side of the discharge port 7. The resonator 13 is a space for silencing the discharge sound of the supercharger 5. As shown in FIG. 2, the resonator 13
Both sides in the vehicle width direction are defined by parts 3C and 3D of the left and right banks 3A and 3B of the V-type engine, and the upper surface of the resonator 13 is defined by the lower surface of the support plate 11. Further, the lower surface of the resonator 13 is a part 3 of the cylinder block connecting the left and right banks 3A and 3B.
It is defined by E. The support plate 11 is arranged so as to contact the left and right banks 3C and 3D at both ends in the vehicle width direction, and as shown in FIG. Part of the bank 3
C, 3D, and 3E work together to form a closed space.

Further, side portions of the resonator 13 in the vehicle front-rear direction are defined by rib members 17A and 17B. The rib members 17A and 17B are plate-shaped members that connect between the left and right banks 3A and 3B of the V-type engine, and are provided on the left and right sides of the left and right banks 3A and 3B that are inclined outward. The bank 3A, 3B offsets the force of the bank 3A, 3B attempting to fall outward due to its own weight.
The communication passage 15 is open at approximately the center of the rib member 17A.

As described above, the resonator 13 has parts 3C, 3 of the banks 3A, 3B whose left and right sides in the vehicle width direction are left and right.
D, the upper surface is defined by the support plate 11, the lower surface is defined by the cylinder block part 3E connecting the left and right banks, and both side portions in the vehicle front-rear direction are defined by the rib members 17A, 17B.
It is a closed space as a whole. A switching valve 19 is provided in the middle of the communication passage 15, and when the discharge sound of the supercharger 5 exceeds a certain level, it is controlled to connect the resonator 13 and the intake passage 9.

The intake noise reduction device according to this embodiment, which is configured as described above, operates as follows. The intake air pressurized in the supercharger 5 is discharged downward through the discharge port 7 and passes through the intake passage 9 to an intercooler (not shown).
It is sent to each combustion chamber via. When the discharge sound of the intake air exceeds a certain level, the switching valve 19 opens and the intake passage 9
And the resonator 13 are communicated with each other. The sound wave of the discharge sound is guided to the inside of the resonator 13 and is silenced by the resonance action of the resonator 13.

In the present embodiment, the support plate 11 has been described as a separate body from the supercharger 5, but the support plate 11
May be integral with the supercharger 5.

[0017]

In the present invention, the space as the resonator is defined by appropriately using the existing engine components such as the cylinder block wall in the left and right banks of the V engine, the bottom surface of the supercharger and the rib member. Therefore, it is not necessary to provide the resonator itself as a component, and the space in the engine room can be saved. Therefore, V which requires a relatively large space
Especially suitable for mold engines.

Further, since the discharge port of the supercharger is formed downward, the wall portions of the left and right banks of the V-type engine are formed as compared with the case where the discharge port is formed sideways or upward. It is possible to more effectively suppress the ejection noise by utilizing the above. Furthermore, since the resonator is defined using the space formed by the walls of the left and right banks, the sound emitted from the resonator itself can also be suppressed by the walls of the left and right banks, and the discharge noise of the supercharger can be suppressed. It also has a double effect.

[Brief description of drawings]

FIG. 1 is a side sectional view of an intake noise reduction device for an internal combustion engine with a supercharger according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a plan view of FIG. 1 viewed from above.

[Explanation of symbols]

 1 engine 3A, 3B bank 3C, 3D, 3E part of bank 5 supercharger 7 discharge port 9 intake passage 11 support plate 13 resonator 15 communication passage 17A, 17B rib member 19 switching valve

Claims (8)

[Claims] 1. An intake noise reduction device for an internal combustion engine with a supercharger, wherein a supercharger is arranged between the left and right banks of a V-type engine, and a resonator is connected to an intake passage downstream from the supercharger. Is disposed between the left and right banks of the V-type engine, and the side surface portion of the resonator is constituted by the cylinder block wall portions of the left and right banks of the V-type engine. . 2. The intake noise reduction device for an internal combustion engine with a supercharger according to claim 1, wherein the lower surface of the resonator is formed by a wall portion connecting the cylinder block wall portions of the left and right banks. 3. The intake noise reduction device for an internal combustion engine with a supercharger according to claim 1, wherein an upper surface of the resonator is formed by a bottom surface of the supercharger. 4. The internal combustion engine with a supercharger according to claim 1, wherein a side surface portion of the resonator is constituted by a rib member connecting left and right banks of the V-type engine. Intake noise reduction device. 5. An intake noise reduction device for an internal combustion engine with a supercharger, wherein a supercharger is arranged between the left and right banks of a V-type engine, and a resonator is connected to an intake passage downstream of the supercharger. The outlet of the feeder is opened downward between the left and right banks, the resonator is disposed between the left and right banks of the V-type engine, and the side surface of the resonator is a cylinder block wall of the left and right banks of the V-type engine. An intake noise reduction device for an internal combustion engine with a supercharger, characterized in that 6. The intake noise reduction device for an internal combustion engine with a supercharger according to claim 5, wherein a lower surface of the resonator is formed by a wall portion connecting wall portions of cylinder blocks of the left and right banks. 7. The intake noise reduction device for an internal combustion engine with a supercharger according to claim 5, wherein an upper surface of the resonator is formed by a bottom surface of the supercharger. 8. The internal combustion engine with a supercharger according to claim 5, wherein a side surface portion of the resonator is formed by a rib member connecting left and right banks of the V-type engine. Intake noise reduction device.