JP2001295623A - Supercharger with muffler for internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a supercharger provided with a highly effective muffler. SOLUTION: In this supercharger, provided with a muffler having an inner cylinder and an outer cylinder for suppressing noises caused by rotary blades for air pressurization provide for a supercharger for an internal combustion engine, the muffler is internally provided with multiple sound absorbing boards to extend along air flow and in a radial direction of the air passage of the muffler; or multiple sound absorbing boards to extend along air flow and curvingly converging from the radially outer side of the air passage to its center; or multiple sound absorbing boards extending along air flow and from the inner cylinder to the outer cylinder with a prescribed angle with respect to the radial direction; or multiple sound absorbing boards for guiding air to flow into the supercharger smoothly along the rotary blades; or a sound absorbing board extending along air flow and forming a vortex shape from the center of the air passage toward the radially outer side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a supercharger provided with a silencer for suppressing a sound generated at the time of air supply in an internal combustion engine.

[0002]

2. Description of the Related Art FIG. 11 is a perspective view of a muffler 200 provided in a supercharger of a conventional internal combustion engine. In FIG. 11, the silencer 200 is in a half-split state, but for the sake of explanation, it is split in half so that the inside of the silencer 200 can be seen. In FIG. 11, the silencer 200 is
1 and an outer cylinder 92, and the inner cylinder 91 and the outer cylinder 92 are
3 A top plate 94 is fixed to the annular upper end surface of the outer cylinder 92, and the upper end surface 91a of the inner cylinder 91 is separated from the top plate 94. An air hole 95 is provided in the cylindrical side wall 92 a of the outer cylinder 92. A sound absorbing material (not shown) made of a nonwoven fabric is attached to the inner peripheral surface of the cylindrical side wall 92a of the outer cylinder 92 and the lower surfaces of the inner cylinder 91 and the top plate 94.

[0003] In the silencer 200 thus formed,
The air that has entered through the air holes 95 rises between the inner cylinder 91 and the outer cylinder 92, descends inside the annular hole 91 b of the inner cylinder 91, and heads toward the supercharger. On the other hand, the sound generated when the rotating blades (not shown) of the supercharger supplied with air rotates rotates in the opposite direction to the above-described air. At that time, the sound is attenuated by the sound absorbing material attached to the inner cylinder 91, the outer cylinder 92, and the like.

[0004]

SUMMARY OF THE INVENTION
0, the generated sound cannot be reduced sufficiently. Therefore, an object of the present invention is to provide a supercharger provided with a muffler capable of exhibiting a better muffling effect.

[0005]

According to a first aspect of the present invention, there is provided an internal combustion engine having an inner cylinder and an outer cylinder which suppress noise generated by a rotating blade for air pressurization of a supercharger of an internal combustion engine. In a supercharger provided with a muffler, a sound absorbing plate is provided in the muffler so as to extend along a flow direction of air and to extend in a radial direction of an air flow path of the muffler.

According to a second aspect of the present invention, there is provided a supercharger including a muffler having an inner cylinder and an outer cylinder that suppresses a sound generated by a rotating blade for air pressurization of a supercharger of an internal combustion engine. A plurality of sound absorbing plates are provided in the inside of the air passage, which are curved from the radial outside of the air flow path and converge to the center of the flow path.

According to a third aspect of the present invention, there is provided a supercharger including a muffler having an inner cylinder and an outer cylinder for suppressing a sound generated by a rotating blade for air pressurization of a supercharger of an internal combustion engine. A plurality of sound-absorbing plates are provided therein, extending along the flow direction of air and extending from the inner cylinder to the outer cylinder at a predetermined angle with respect to the radial direction.

According to a fourth aspect of the present invention, there is provided a supercharger provided with a silencer having an inner cylinder and an outer cylinder which suppresses a sound generated by a rotating blade for air pressurization of a supercharger of an internal combustion engine. A plurality of sound absorbing plates were provided in the muffler so as to smoothly flow into the feeder along the rotating blades.

According to a fifth aspect of the present invention, there is provided a supercharger comprising a muffler having an inner cylinder and an outer cylinder for suppressing a sound generated by a rotary blade for air pressurization of a supercharger of an internal combustion engine. A sound-absorbing plate is formed in the inside, which forms a vortex along the flow direction of the air and radially outward from the center of the air flow path.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment of the Invention) FIG.
Is a silencer 100 provided in a supercharger according to the invention of claim 1.
FIG. 2 is an exploded perspective view of the muffler 100 shown in FIG.
FIG. 3 is a perspective view of a state in which it is properly assembled. Silencer 1
Reference numeral 00 denotes a cylindrical inner cylinder 1, an outer cylinder 2, an annular bottom plate 3, a disc-shaped top plate 4, a partition plate 6, and the like.

FIG. 3 is a schematic sectional view of the silencer 100 and the supercharger 101. The diameter of the inner circumference of the bottom plate 3 and the inner diameter of the inner cylinder 1 substantially match the diameter of the air inlet of the supercharger 101 as shown in FIG. 3, and the lower end of the inner cylinder 1 and the bottom plate 3 are integrally formed. It is fixed. Further, the outer peripheral end of the bottom plate 3 and the lower end of the outer cylinder 2 are integrally fixed, and the upper end of the outer cylinder 2 and the top plate 4 are integrally fixed.

A plurality (eight in FIG. 1 and FIG. 2) of partition plates 6 extending in the radial direction of the inner cylinder 1 is provided between the inner cylinder 1 and the outer cylinder 2. The partition plate 6 is fixed to the bottom plate 3 and the cylindrical wall of the inner cylinder 1, extends beyond the upper end of the inner cylinder 1 to the center axis of the inner cylinder 1, and extends on the center axis of the inner cylinder 1. The other partition plate 6 is integrally fixed (fixedly formed). The partition plate 6 and the inner wall of the cylinder of the outer cylinder 2 and the lower surface of the top plate 4 are fixed.
Both surfaces of the cylindrical wall of the inner cylinder 1 and the inner wall surface of the cylinder of the outer cylinder 2 and the top plate 4
A sound absorbing material 7 made of a nonwoven fabric is adhered to the lower surface of the bottom plate 3 and the upper surface of the bottom plate 3.

As shown in FIG. 3, a plurality of air holes 5 are provided in the side wall of the cylinder of the outer cylinder 2, and when the blade 8 of the supercharger 101 is rotated about the rotation shaft 9 by the energy of the exhaust gas. The air that has entered the silencer 100 from the air hole 5 rises in the space partitioned by the inner cylinder 1, the outer cylinder 2, and the partition plate 6 (not shown in FIG. 3) as shown by arrows, It advances along the top plate 4 in the direction of the central axis of the inner cylinder 1, descends inside the inner cylinder 1, is supplied into the supercharger 101, and the compressed air flow is discharged from the discharge port 101 a of the supercharger 101. .

At this time, the sound generated by the blade 8 travels in a direction opposite to the traveling direction of the air, as indicated by the arrow in FIG. The sound generated by the blades 8 is absorbed by the sound absorbing material 7 and attenuated. The total area of the sound absorbing material 7 provided in the silencer 100 is increased by the amount provided with the partition plate 6 as compared with the case of the conventional silencer 200 (FIG. 11). The area increases, and the noise reduction effect increases accordingly. The degree of improvement in the noise reduction effect is proportional to the amount of increase in the total area of the sound absorbing material 7 with which the sound generated by the blade 8 contacts. If the area of the sound absorbing material 7 is twice as large as that of the related art, a double noise reduction effect can be expected.

In FIG. 1 and FIG.
Although the example in which eight are provided is shown, any number may be provided as long as the air supply efficiency of the supercharger 101 is not reduced. Further, as shown in FIG. 4, the partition plate 6 may be provided only between the inner cylinder 1 and the outer cylinder 2.

The frequency f (Hz) of the wind noise having a high sound pressure level among the sounds generated by the blades 8 can be calculated by equation (1). f = (number of revolutions of turbocharger blades) / 60 × (number of turbocharger blades) (1)

[0017] As an example, the rotational speed is 6.0 × 10 ⁴ of the blade 8 of the supercharger (rpm), when the eight the number of blades 8, the frequency ^{f = 6.0 × 10 4/60} × 8 = 8.0 × 1
0 ³ (Hz). The sound pressure in this 8 kHz band is shown in FIG.
1 than the conventional silencer 200 shown in FIG.
At 00, it is about 10 dB lower.

The partition plate 6 functions as a reinforcing rib of the muffler 100 by being fixed to the top plate 4 or the like by welding or bonding, and can suppress vibration of the muffler 100 itself.

(Embodiments of the Inventions of Claims 2 and 3) FIGS. 5 and 6 are perspective views of parts of mufflers 110 and 120 provided in a supercharger according to the inventions of Claims 2 and 3, respectively. . FIG.
Although the outer cylinder and the top plate are not shown in FIG. 6, the outer cylinder and the top plate having the same structure as the outer cylinder 2 and the top plate 4 in FIG. 1 are used.

The silencers 110 and 120 shown in FIGS.
The silencer 100 differs from the silencer 100 only in the shape of the partition plates 10 and 11, and all other configurations are the same. The silencer 1 of FIG.
The partition plate 11 extends in the tangential direction of the inner cylinder 1 from the inner wall surface of the outer cylinder (not shown) to the outer wall surface of the inner cylinder 1. The partition plate 10 of the muffler 110 in FIG. 5 is bent from the connection portion of the partition plate 11 of the muffler 120 in FIG. Has converged. Although not shown, partition plates 10 and 11
A sound absorbing material is stuck on both sides.

Here, the partition plate 11 shown in FIG. 6 is not limited to the tangential direction of the inner cylinder 1 and may be set at an arbitrary angle with respect to the inner cylinder 1; Is shown in Further, the partition plate 11 is not necessarily required to be in a flat plate shape, and may be in a curved plate shape.

(Embodiment of the Fourth Invention) FIG. 7 is a perspective view of a muffler 130 provided in a supercharger according to the fourth invention. In FIG. 7, the outer cylinder 2 and the top plate 4 are removed from the silencer 130. In FIG. 7, the partition plate 12 extends from the bottom plate 3 to the top plate 4 (removed in FIG. 7) from the outer wall surface of the cylinder of the inner cylinder 1 to the inner wall surface of the cylinder of the outer cylinder 2 (removed in FIG. 7). ) And spiral shape. Although not shown, a sound absorbing material is attached to both surfaces of the partition plate 12.

Therefore, the air entering through the air hole 5 is
Forming a swirling flow in the silencer 130 along the partition plate 12,
As shown in FIG. 8, the air flows obliquely into the supercharger 101. At this time, in consideration of the mounting angle of the blade 8, the angle at which the blade flows into the blade 8 is set so as to reduce the resistance to the blade 8, that is,
If the partition plate 12 is installed so that air flows in parallel to the mounting angle of the blade 8 (the swirl passage) of the supercharger 101, the supercharger 1
01 is improved.

In FIG. 7, the partition plate 12 is not inside the inner cylinder 1, but a spiral-shaped partition in which sound absorbing materials are stuck on both sides in such a direction as to further increase the swirling flow of air inside the inner cylinder 1. A plate may be provided.

FIG. 9 is a perspective view of a muffler 140 provided in a supercharger according to a fifth embodiment of the present invention. 9, the outer cylinder 2 and the top plate 4 of the silencer 140 are removed similarly to FIG. The silencer 140 of FIG.
In this case, the partition plate 13 forms a spiral shape from the inside of the cylindrical wall of the outer cylinder 2 to the inside of the inner cylinder 1. Although not shown, a sound absorbing material is attached to both surfaces of the partition plate 13.

When the lower surface of the top plate 4 is fixed to the upper edge of the partition plate 13, the air entering through the air holes 5 travels along the partition plate 13, forms a swirling flow, and is supplied to the supercharger 101. You.
Therefore, similarly to the embodiment of the fourth aspect of the present invention, when the direction of the swirling flow is adjusted so as to reduce the resistance to the blade 8 (FIG. 8), the air compression efficiency of the supercharger 101 can be improved. it can. In FIG. 9, the partition plate 13 extends to the inside of the inner cylinder 1, but may be as far as the cylindrical wall of the inner cylinder 1.

Although the sound generated by the supercharger 101 travels in the opposite direction to the air, the area in which the sound comes into contact with the sound absorbing material 7 (not shown) is reduced because the partition plate 13 is formed in a spiral shape. 20
It is larger than 0, and a good silencing effect can be achieved.

FIG. 10 shows the partition plate 1 of the silencer 140 shown in FIG.
It is a perspective view of a part of the silencer 140a provided with the partition plate 13a instead of 3. Partition plates 13 are provided on both sides of the partition plate 13a.
Similarly to the above, a sound absorbing material (not shown) is attached, and the partition plate 13a is provided with a large number of through holes 15 penetrating with the sound absorbing material.

The partition plate 13 having such a through hole 15
Since the air can pass through the through hole 15 in the silencer 140a provided with a, the air supply resistance of the supercharger 101 (FIG. 9) can be reduced as compared with the silencer 140 shown in FIG. it can. By similarly providing through holes in the partition plates 6, 10 to 13, the air supply resistance can be reduced.

In the above description of the embodiments of the present invention, the partition plates 10, 11, 12, 13 and the top plate 4 may or may not be fixed. When it is fixed, the vibration generated by the top plate 4 and the like due to the sound generated by the supercharger 1 and the flow of air is suppressed, and the sound deadening effect is further enhanced.

[0031]

According to the conventional silencer 200 (FIG. 11), only the ceiling 94, the inner cylinder 91, the outer cylinder 92 and the bottom plate 93 have the sound absorbing portions. Is provided so as to extend radially with respect to the inner cylinder 1, so that the sound absorbing area is increased by an amount corresponding to the provision of the partition plate 6, so that the sound absorbing effect is better than before. Can be.

According to the second aspect of the present invention, similar to the first aspect of the present invention, since the partition plate 10 (sound absorbing plate) having the sound absorbing material attached to both surfaces is provided in the silencer 110, the conventional silencer 200 is provided.
The silencing effect is improved as compared with the above. In addition, since the partition plate 10 is formed into a shape converging while being curved from the outside in the radial direction of the air flow path to the center of the flow path, the air flow becomes easy to turn, and the resistance of the supercharger 101 to the blades 8 is reduced. Therefore, the air compression efficiency of the supercharger 101 can be improved.

In the silencer 120 according to the third aspect of the present invention,
Since a plurality of partitioning plates 11 (sound absorbing plates) extending from the inner cylinder 1 to the outer cylinder 2 at a predetermined angle with respect to the radial direction of the inner cylinder 1 are provided, the silencing effect is higher than that of the conventional silencer 200, and The air resistance to the blade 8 can be reduced as compared with the silencer 110 according to the second aspect of the present invention.

In the silencer 130 according to the fourth aspect of the present invention,
Since the partition plate 12 (sound absorbing plate) in which the sound absorbing material is attached to both surfaces is provided, the sound absorbing effect is improved as compared with the conventional silencer 200.
Further, since the partition plate 12 is provided so that the air smoothly flows into the blades 8 (the swirl passage) of the supercharger 101, the air resistance of the supercharger 101 is reduced, and the air compression efficiency is improved. .

In the silencer 140 according to the fifth aspect of the present invention,
Since the partition plate 13 (sound absorbing plate) is formed in a spiral shape, a single partition plate 13 can provide the same noise reduction effect as the mufflers 100 to 130 of claims 1 to 4 and is easy to assemble. The cost can be reduced by mass production.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a muffler provided in a supercharger according to the first embodiment of the present invention.

FIG. 2 is a perspective view showing a state where the muffler of FIG. 1 is properly assembled.

FIG. 3 is a schematic sectional view of a muffler and a supercharger.

FIG. 4 is a perspective view of another muffler provided in the supercharger according to the first aspect of the present invention.

FIG. 5 is a perspective view of a part of a muffler provided in a supercharger according to the invention of claim 2;

FIG. 6 is a perspective view of a part of a muffler provided in the supercharger according to the third aspect of the present invention.

FIG. 7 is a perspective view of a muffler provided in a supercharger according to a fourth aspect of the present invention.

FIG. 8 is a schematic sectional view of a muffler and a supercharger, showing a state where air flows into a blade of the supercharger at a predetermined angle.

FIG. 9 is a perspective view of a muffler provided in the supercharger according to the invention of claim 5;

FIG. 10 is a perspective view of a part of a muffler in which a plurality of through holes are provided in the partition plate of FIG.

FIG. 11 is a perspective view of a muffler provided in a conventional turbocharger.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Inner cylinder 2 Outer cylinder 3 Bottom plate 4 Top plate 5 Air hole 6 Partition plate 7 Sound absorbing material 8 Blade (turn path of turbocharger) 10-13 Partition plate 100 Silencer 101 Turbocharger

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F01N 1/24 F01N 1/24 F F02B 39/00 F02B 39/00 D

Claims (5)

[Claims] 1. A supercharger comprising a muffler having an inner cylinder and an outer cylinder that suppresses a sound generated by a rotating blade for air pressurization of a supercharger of an internal combustion engine, wherein a flow of air in the muffler is provided. A supercharger provided with a silencer for an internal combustion engine, comprising a sound absorbing plate extending in a direction and in a radial direction of an air flow path of the silencer. 2. A supercharger comprising a muffler having an inner cylinder and an outer cylinder that suppresses a sound generated by a rotating blade for air pressurization of a supercharger of an internal combustion engine, wherein a flow of air in the muffler is provided. A supercharger comprising a silencer for an internal combustion engine, comprising: a plurality of sound absorbing plates that converge to the center of the air flow path while curving from the radial outside of the air flow path. 3. A supercharger comprising a muffler having an inner cylinder and an outer cylinder that suppresses a sound generated by a rotating blade for air pressurization of a supercharger of an internal combustion engine, wherein a flow of air in the muffler is provided. A supercharger equipped with a silencer for an internal combustion engine, comprising a plurality of sound absorbing plates extending along a direction and extending from an inner cylinder to an outer cylinder at a predetermined angle with respect to a radial direction. 4. A supercharger provided with a silencer having an inner cylinder and an outer cylinder that suppresses a sound generated by a rotating blade for air pressurization of a supercharger of an internal combustion engine, wherein the air is supplied to the supercharger by the rotation. A supercharger provided with a silencer for an internal combustion engine, wherein a plurality of sound absorbing plates are provided in the silencer so as to smoothly flow along the blades. 5. A supercharger provided with a muffler having an inner cylinder and an outer cylinder that suppresses a sound generated by a rotating blade for air pressurization of a supercharger of an internal combustion engine, wherein a flow of air in the muffler is provided. A supercharger equipped with a silencer for an internal combustion engine, comprising a sound absorbing plate that forms a vortex shape along a direction and radially outward from a center side of an air flow path.