JPH094434A - Silencer and muffler - Google Patents

Abstract

PURPOSE: To improve silencing efficiency and to reduce contamination around a muffler and to prevent corrosion. CONSTITUTION: A muffler 20 for reducing the exhaust sound of an internal combustion engine is provided with a muffler main body 23 and a muffling device 25. The muffler 20 has a cylindrical housing 21 and an inner pipe arranged inside the housing 21. The muffling device 25 is provided with a device main body attached to the muffler main body 23, a plurality of exhaust disks 41 and an exhaustion stopping member 42. The device main body is a cylindrical member and an exhaust port 45 is formed in the end part of its exhaustion side. The exhaust disks 41 are arranged side by side at intervals in the exhaustion direction of the muffler main boy 23 and ring-like members for discharging exhaust gas from an outer peripheral part to an inner peripheral part by reducing this. The exhaustion stopping member 42 is a disk member attached together with the exhaust disks 41 to the device main body.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a muffler attached to a muffler body for reducing exhaust noise of an internal combustion engine and a muffler attached with the muffler.

[0002]

2. Description of the Related Art A muffler is for reducing the exhaust noise of an internal combustion engine mounted on an automobile, a motorcycle or the like, and it is necessary to reduce the exhaust noise without lowering the exhaust efficiency. As such a muffler, a muffler called Super Trap (trademark) using a cup-shaped annular disc disclosed in US Pat. No. 3,987,868 by Paul S. Moller is known.

FIG. 20 is a vertical sectional view showing the structure of a conventional super trap muffler. The muffler 1 includes a muffler body 2 having a housing 10 serving as an outer shell and an inner pipe 11 communicating with an exhaust pipe of an engine, and a muffler body 1
3, the muffler body 2 and the cup 3 that close the exhaust port of
And a plurality of exhaust members 4 disposed between and.
The inner tube 11 is provided with a number of punching holes 12 for noise reduction. The exhaust members 4 are cup-shaped annular discs and are arranged at intervals in the exhaust direction. The cup 3 and the exhaust member 4 are collectively fastened to the rear end portion of the muffler body 2 with bolts 13. Inner tube 11 and housing 10
The sound absorbing fiberglass 14 is filled in the gap between the and.

In the muffler 1, the exhaust gas E from the engine expands, and a part of the exhaust gas E flows into the fiberglass 15 from the punching hole 12 and is silenced. The rest is discharged from the muffler body 2 and expanded or collides with the cup 3 to expand and is discharged to the side from the gap of the exhaust member 4.

[0005]

In the above-mentioned conventional configuration,
Exhaust gas from the muffler body collides with the cup and expands, and when the gas is discharged from the exhaust member, the sound is silenced, so that it is easy to prevent the scattering of the sparks. However, there is a problem that the sound deadening efficiency is low because the sound is simply muted by the reduction of the exhaust member. Also, since the exhaust is from the side, the exhaust around the muffler may be contaminated by the exhaust or the occupant may be exhausted especially when the exhaust is attached to a motorcycle engine. Further, since the exhaust member is exposed to the outside, moisture such as rainwater easily enters the exhaust member and the corrosion of the muffler is facilitated.

It is an object of the present invention to provide a muffler and a muffler which can improve the muffling efficiency, have less pollution around the muffler and are less likely to corrode.

[0007]

A silencer according to the invention of claim 1 is a device attached to a muffler body for reducing exhaust noise of an internal combustion engine, the device body, a plurality of exhaust members, And an exhaust stop member. The apparatus main body is attached to the exhaust end of the muffler main body, and has an exhaust port at the end on the discharge side. The exhaust member is a ring-shaped member that is arranged in parallel in the exhaust direction of the muffler body with a space therebetween and that reduces the exhaust gas from the outer peripheral portion toward the inner peripheral portion and discharges the exhaust gas. The exhaust stop member is a disk-shaped member attached to the apparatus body together with the exhaust member.

According to a second aspect of the present invention, there is provided the silencer according to the first aspect, in which the device body is cylindrical, and the exhaust member and the exhaust stop member are mounted inside the device body. According to a third aspect of the present invention, in the silencer according to the second aspect, the device body has an expansion space between the muffler body and the exhaust stop member for expanding the exhaust gas from the muffler body.

A silencer according to a fourth aspect is the device according to any one of the first to third aspects, wherein the exhaust member has a first recess formed in a ring shape on the outer peripheral side and a first recess on the inner peripheral side. There is a first recess and a second recess formed in a ring shape on the opposite side, and the second recess is recessed toward the muffler body. A silencer according to a fifth aspect is the device according to any one of the first to fourth aspects, wherein the exhaust stop member is arranged on the exhaust upstream side of the exhaust member.

A sound deadening device according to a sixth aspect is the device according to any one of the first to fifth aspects, wherein the device body can be fastened to the muffler body with a bolt. A silencer according to claim 7 is the device according to any one of claims 1 to 5, wherein the device body has a screw portion that can be fastened to the muffler body, and the muffler is rotated by rotating the device body. Can be attached to the body.

A silencer according to an eighth aspect of the present invention is the device according to any one of the first to fifth aspects, wherein the device body can be attached to the muffler body by welding. A muffler according to a ninth aspect is a muffler that reduces exhaust noise of an internal combustion engine, and includes a muffler body and a silencer. The muffler body is connected to the exhaust pipe of the internal combustion engine. The silencer is attached to the rear end of the muffler body.
The device according to any one of 1.

[0012]

In the muffler according to the first aspect of the present invention, the exhaust gas from the muffler body expands and is silenced, and collides with the exhaust stop member. Then, it flows from the outer peripheral side toward the inner peripheral side in the gaps between the exhaust members to be reduced and silenced, and is further silenced while colliding at the central portion and discharged from the exhaust port.

In this case, since the exhaust gas is silenced in three stages: expansion on the outlet side of the muffler body, contraction on the exhaust member, and collision at the central portion, it is possible to effectively silence the sound and exhaust it rearward from the exhaust port. Therefore, the pollution of the surroundings due to the exhaust is reduced and the inside is less likely to be corroded. In the muffler according to the second aspect, since the exhaust member and the exhaust stop member are attached inside the tubular device body, the silencer can be easily attached to the rear portion of the existing muffler body.

In the silencer according to the third aspect of the present invention, since the device body has the expansion chamber for expanding the exhaust gas from the muffler body between the muffler body and the exhaust stop member, the expansion volume becomes large. , The muffling efficiency can be further improved. In the muffler according to the fourth aspect, the exhaust passes through the exhaust member from the outer peripheral side in the order of the first recess and the second recess to be reduced in size and silenced. Then, the exhaust gases from the second recesses that are recessed toward the muffler body collide with each other, are silenced, and are guided rearward.

Here, when the exhaust gases are guided rearward, the exhaust gases are mutually pulled, so that the exhaust gases are efficiently exhausted. In the silencer according to the fifth aspect, since the exhaust stop member is arranged on the exhaust upstream side of the exhaust member, the area of the exhaust outlet is increased, the exhaust can be performed more efficiently, and the exhaust temperature is lowered.

In the sound deadening device according to the sixth aspect of the invention, since the device body can be fastened to the muffler body with bolts, the sound deadening device can be attached and removed easily. Therefore, the muffling device can be easily cleaned even if carbon or the like is attached. In the muffler according to the seventh aspect, the muffler can be attached to the muffler body by rotating the body, so that the muffler can be easily attached and detached. Therefore, even if carbon or the like is attached, the silencer can be cleaned more easily.

In the silencer according to the eighth aspect, since the device body can be attached to the muffler body by welding, the silencer can be firmly fixed to the muffler body. With the muffler according to the ninth aspect, the same effect can be obtained by the same operation as the above.

[0018]

1 is a perspective view of a muffler adopting an embodiment of the present invention, and FIG. 2 is a longitudinal sectional view thereof. 1 and 2, the muffler 20 is a housing 2 serving as an outer shell.
1 and a muffler body 23 having an inner pipe 22 communicating with the exhaust pipe of the engine, and a muffler 25 fastened to the exhaust end of the muffler body 23 by a mounting bolt 24. The housing 21 includes, for example, a tubular connecting portion 30 connected to an exhaust pipe of a motorcycle engine, and the connecting portion 30.
From the expansion part 31, the expansion part 31 which spreads in a trumpet shape and the housing main body 32 which extends in a cylindrical shape are included.

As shown in FIG. 2, a ring-shaped flange portion 33 having a U-shaped cross section is fastened to the rear end (discharge end) of the housing main body 32 with a screw 36. The inner pipe 22 is a tubular member having substantially the same outer diameter as the connecting portion 30, and one end thereof is welded to the inner wall of the housing 21 at the boundary between the connecting portion 30 and the expansion portion 31. The other end of the inner pipe 22 is welded to the inner wall of the flange portion 33. Innumerable punching holes 34 are formed on the peripheral surface of the inner tube 22. A gap between the inner tube 22 and the housing 21 is filled with sound absorbing fiberglass 35.

As shown in FIGS. 3 and 4, the silencer 25 includes a cylindrical device body 40, a plurality of exhaust disks 41 arranged side by side in the exhaust direction at intervals, and exhaust upstream of the exhaust disks 41. On the side, an exhaust disc 41 and an exhaust stop member 42 arranged in parallel are provided. The device body 40 has a frustoconical shape that bulges outward, and a plurality of exhaust disks 41 are arranged side by side inside the device body 40. Device body 4
An exhaust port 45 is formed on the exhaust downstream side of 0. Further, bolt holes 46 extending in the axial direction are provided in the circumferential surface at, for example, six locations at equal intervals in the circumferential direction. The muffling device 25 is attached to the muffler body 23 by the attachment bolts 24 inserted through the bolt holes 46.

The exhaust disc 41 is ring-shaped, and has a first recess 50 formed in an annular recess on the outer peripheral side thereof, and a first recess 50.
The first recess 50 is provided on the inner peripheral side of the recess 50, and the second recess 51 is formed annularly on the opposite side of the recess 50. First recess 50
Is recessed toward the exhaust side, and conversely the second recessed part 51 exhausts the exhaust gas to approximately 4
It is recessed on the muffler body side 23 side so as to exhaust the air to the rear by 5 °. A circular exhaust hole 52 is opened at the inner peripheral end of the second recess 51. A plurality of protrusions 53 for separating the exhaust disks 41 at equal intervals are provided on the peripheral edge of each exhaust disk 41 at equal intervals in the circumferential direction.

The exhaust stop member 42 is a disk-shaped member,
The exhaust disk 41 and the exhaust disk 41 are collectively attached to the apparatus main body 40 by the attachment bolts 43. Exhaust stop member 4
3 is substantially the same shape as the exhaust disc 41, and the exhaust hole 5
The shape of 2 is closed by a circular stop plate 55. An expansion space 44 is provided between the exhaust upstream side of the exhaust stop member 42 and the exhaust port of the muffler body 23. A sound deadening effect can be obtained by expanding the exhaust gas in the expansion space 44.

Next, the procedure for assembling the muffler 20 will be described with reference to FIG. First, the muffler body 23, the apparatus body 40, the plurality of exhaust disks 41, and the exhaust stop member 42 are prepared. Then, the exhaust disk 41 is arranged so that the first recess 50 faces the exhaust upstream side, and the exhaust disk 41 and the exhaust stop member 42 are overlapped. At this time, the exhaust stop member 4
2 is arranged on the upstream side of the exhaust gas. Next, a stack of the exhaust disc 41 and the exhaust stop member 42 is collectively fastened to the device body 40 with the mounting bolts 43, and the silencer 25 is assembled. Finally, the assembled silencer 25 is fastened to the muffler body 23 with the mounting bolts 24. As described above, the muffler 20 of the present embodiment has the mounting bolts 24, 43.
Anyone can easily assemble simply by fastening. It is also possible to attach only the muffler 25 to the existing muffler with the attachment bolts 24.

Next, the flow of exhaust gas in the muffler 20 will be described with reference to FIG. In this muffler 20, the exhaust gas from the engine expands, and a part thereof flows into the fiberglass 35 from the punching holes 34 and is silenced.
The rest is discharged from the muffler body 23 and expanded space 44
It expands and is silenced. Exhaust gas expanded 4
2 and is stored in the expansion space 44. Then, it passes through the narrow gap between the exhaust disks 41 from the outer peripheral side to the inner peripheral side. At this time, the exhaust gas is reduced and muted. Then, they are collected at the exhaust holes 52 and exhausted from the exhaust port 45.
At the time of this exhaust gas collection, the exhaust gases collide with each other to cancel each other out and muffle. Further, the exhaust gases discharged to the exhaust port 52 via the second recess 51 collide with each other at an angle of 45 ° rearward and the exhaust gases pull each other, so that the exhaust efficiency is improved.

If the inner diameters of the exhaust hole 52 and the exhaust port 45 are increased, the exhaust efficiency can be further improved and the appearance design can be powerful.
Further, the exhaust efficiency can be adjusted by adjusting the number of exhaust disks 41. For example, if the number of the exhaust disks 41 is increased, the area of the exhaust outlet can be increased, so that the muffling efficiency is reduced but the exhaust gas efficiency can be increased.

Further, the sound deadening efficiency can be improved by changing the position of the exhaust stop plate 42. For example, if the exhaust stop plate 42 is disposed between the exhaust discs 41 and displaced to the rear, the area of the exhaust outlet is reduced, so that the exhaust efficiency is reduced but the silencing efficiency is increased. As described above, in the muffling device 25 of this embodiment, the expansion space 44 is first muffled,
Next, since the sound is muted when the space between the exhaust discs 41 is reduced, and further, the sound is muted by the collision at the exhaust port 52, the sound is muted in three stages, so the sound deadening efficiency is improved. It is estimated that the muffler ratio here is 20% for the muffler body, 25% for expansion in the expansion space 44, 30% for contraction at the exhaust disc 41, and about 25% for collision at the exhaust hole 52. In addition, since the exhaust air is exhausted rearward, it is possible to prevent contamination of the surrounding area due to the exhaust gas, and it is difficult for water to enter the inside of the muffler and the inside is less likely to be corroded. In addition, the silencer 25
Since it is removable, the inside can be easily cleaned.

[Other Embodiments] (1) As shown in FIGS. 6 and 7, the muffling device 25 may be fixed to the muffler body 23 by welding at the welding portion 60. In this case, the muffler body 23 and the muffling device 25 are attached more firmly. (2) As shown in FIG. 8 and FIG. 9, the housing 2 of the muffler body 23 is attached to the end of the device body 40 of the silencer 25.
It is also possible to provide the spigot portion 61 that fits in 1 and to fasten the spigot portion 61 and the housing 21 with the screw 62 from the outer peripheral side of the housing 21. In this case, both can be easily fastened. (3) As shown in FIGS. 10 and 11, the silencer 2
5, the male screw portion 63 is provided at the end of the device body 40, and the female screw portion 64 to be screwed into the male screw portion 23 is provided at the rear end of the housing 21 of the muffler body 23 to rotate the silencer 25. The muffling device 25 may be attached to the muffler body 23. In this case, the silencer 25 can be easily attached and detached, and the muffler body 23 and the silencer 2
Even if carbon or the like adheres to the inside of 5, it can be easily cleaned. (4) As shown in FIG. 12, a wing 65 for decoration may be provided on the device body 40 of the silencer 25. In this case, the design of the silencer 25 is further improved. (5) As shown in FIGS. 13 to 17, the shape of the muffler can be arbitrarily changed depending on the type of motorcycle. Note that the structure of the muffler body is not shown in these drawings.

For example, when used for an American type motorcycle, a muffler 20a as shown in FIG. 13 may be used. In this muffler 20a, the muffler body 23a
The exhaust cover 66 is provided continuously to the housing 21a of
The silencer 25a may be arranged inside the exhaust cover 66. When used for an American type motorcycle, a muffler 20b as shown in FIG. 14 may be used. In this muffler 20b, the inclination of the expansion portion 31b of the housing 21b and the inclination of the device body 40b of the silencer 25b are gentler than those of the embodiment of FIG. 2 described above. Further, the peripheral surface of the device body 40b is straight.

A muffler 20c as shown in FIG. 15 can be adopted in all types of motorcycles. This muffler 20c
The inclination of the expanded portion 31c of the housing 21c is further gentle. When used for a single cylinder engine, a muffler 20d as shown in FIG. 16 may be used. This muffler 20
As for d, the housing 21d has a connection portion 30d and an extension portion 31d.
And the housing body and the extension portion are integrated.

When used for a multi-cylinder medium and small engine, a muffler 20e as shown in FIG. 17 may be used. In this muffler 20e, a housing 21e has a connecting portion 30e and a housing main body 32e, both of which are cylindrical. Therefore, the side plate 31e is provided at the front end of the housing body 31e. In addition, the device body 40 of the silencer 25e
e is an exhaust pipe 4 having an exhaust port 45 in a disk-shaped member 47e.
8e is a fixed shape. An exhaust disc 41 and an exhaust stop member 42 are attached to the muffler body 23e side (back surface) of the device body 40e.

In these cases, the sound deadening efficiency and the exhaust efficiency can be improved without impairing the apparent design. (6) As shown in FIGS. 18 and 19, the shapes of the muffler main bodies 23f and 23g may be changed according to the engine type and displacement. In FIG. 18, the muffler body 23f
The expansion space 44 on the side is made shorter than that of the embodiment shown in FIG. 2 to improve the sound deadening efficiency and the exhaust efficiency. Further, the torque (power) of the engine can be increased. Furthermore, the expansion space 44 can be freely resized. This is also a silencer 2
5 is attached to the rear of the muffler body 23f. In FIG. 19, the inner pipe 22g is made large at the rear end to improve the sound deadening efficiency and the exhaust efficiency. Also, the torque (power) of the engine can be increased. (8) The muffler and muffler of the present invention are not limited to motorcycle engines, but can be applied to mufflers and mufflers for internal combustion engines of automobiles and other industrial machines.

[0032]

In the muffler according to the first aspect of the present invention, since the muffler body muffles the exhaust gas in three stages: expansion at the muffler body outlet side, contraction at the exhaust member, and collision at the central portion, it is possible to muffle efficiently. Since the air is exhausted rearward from the exhaust port, the pollution of the surroundings due to the exhaust is reduced and the inside is less likely to be corroded.

In the silencer according to the second aspect, since the exhaust member and the exhaust stop member are attached inside the tubular device body, the silencer can be easily attached to the rear part of the existing muffler body. In the muffler according to claim 3, since the device main body has the expansion chamber for expanding the exhaust gas from the muffler main body between the muffler main body and the exhaust stop member, the expansion volume is increased, and the muffling is further suppressed. The efficiency can be increased.

In the muffler according to the fourth aspect, when the exhaust is guided rearward, the exhausts pull each other and the exhaust is efficiently performed. In the silencer according to the fifth aspect, since the exhaust stop member is arranged on the exhaust upstream side of the exhaust member, the area of the exhaust outlet is increased, the exhaust can be performed more efficiently, and the exhaust temperature is lowered.

In the sound deadening device according to the sixth aspect, since the device body can be fastened to the muffler body with bolts, the sound deadening device can be attached and detached easily. In the muffler according to the seventh aspect, the muffler can be attached to the muffler body by rotating the body, so that the muffler can be easily attached and detached. Therefore, even if carbon or the like is attached, the silencer can be cleaned more easily.

In the sound deadening device according to the eighth aspect, since the device body can be attached to the muffler body by welding, the sound deadening device can be firmly fixed to the muffler body. With the muffler according to claim 9, the same effect as described above can be obtained.

[Brief description of drawings]

FIG. 1 is a perspective view showing a structure of a muffler according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view thereof.

FIG. 3 is a perspective view of a silencer according to an embodiment of the present invention.

FIG. 4 is a longitudinal sectional view thereof.

FIG. 5 is an exploded perspective view of a muffler.

FIG. 6 is a diagram corresponding to FIG. 2 of another embodiment.

FIG. 7 is a perspective view of the silencer.

FIG. 8 is a view corresponding to FIG. 2 of still another embodiment.

FIG. 9 is a perspective view of the silencer.

FIG. 10 is a view corresponding to FIG. 2 of still another embodiment.

FIG. 11 is a perspective view of the silencer.

FIG. 12 is a perspective view of a silencer according to still another embodiment.

FIG. 13 is a vertical sectional view of a muffler of still another embodiment.

FIG. 14 is a vertical sectional view of a muffler of still another embodiment.

FIG. 15 is a vertical sectional view of a muffler of still another embodiment.

FIG. 16 is a vertical sectional view of a muffler of still another embodiment.

FIG. 17 is a vertical cross-sectional view of a muffler of still another embodiment.

FIG. 18 is a vertical sectional view of a muffler of still another embodiment.

FIG. 19 is a vertical sectional view of a muffler of still another embodiment.

FIG. 20 is a vertical sectional view of a conventional muffler.

[Explanation of reference numerals] 20 muffler 23 muffler body 24 mounting bolt 25 muffler 41 exhaust disc 42 exhaust stop member 50 first recess 51 second recess

Claims (9)

[Claims] 1. A muffler attached to a muffler main body for reducing exhaust noise of an internal combustion engine, the silencer being attachable to an exhaust end of the muffler main body and having an exhaust port at its exhaust side end. A main body, and the muffler main body is arranged side by side in the exhaust direction of the muffler,
A plurality of ring-shaped exhaust members for reducing and discharging exhaust gas from the outer peripheral portion toward the inner peripheral portion, and a disk-shaped exhaust stop member attached to the apparatus body together with the exhaust member are provided. Silencer. 2. The silencer according to claim 1, wherein the device body is cylindrical, and the exhaust member and the exhaust stop member are mounted inside the device body. 3. The silencer according to claim 2, wherein the device body has an expansion chamber for expanding the exhaust gas from the muffler body between the muffler body and the exhaust stop member. 4. The exhaust member includes a first recess formed in a ring shape on the outer peripheral side, and a second recess formed in a ring shape on the inner peripheral side opposite to the first recess. And the second recess is recessed toward the muffler body.
The silencer according to any one of 1 to 3. 5. The silencer according to claim 1, wherein the exhaust stop member is arranged on an exhaust upstream side of the exhaust member. 6. The silencer according to claim 1, wherein the device body can be fastened to the muffler body with a bolt. 7. The apparatus main body has a screw portion that can be fastened to the muffler main body, and can be attached to the muffler main body by rotating the apparatus main body.
The silencer according to any one of 1. 8. The silencer according to claim 1, wherein the device body can be attached to the muffler body by welding. 9. A muffler for reducing exhaust noise of an internal combustion engine, wherein the muffler body is connected to an exhaust pipe of the internal combustion engine, and the muffler body is attached to a rear end of the muffler body. A muffler provided with the silencer described in.