JP2548187Y2 - Vehicle silencer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an improvement of a vehicle silencer mounted on a vehicle exhaust system.

[Conventional technology]

2. Description of the Related Art Conventionally, a muffler is mounted on a vehicle exhaust system, and exhaust noise is silenced by an expansion attenuation function of exhaust energy in an expansion chamber in the muffler and a resonance attenuation function in a resonance chamber.

Thus, such a silencer has a structure in which both end openings of a cylindrical shell 1 are closed by end plates 3 as shown in FIG. 10. Conventionally, the end plate 3 is a single plate-like plate. Therefore, there is a possibility that sound radiation from the end plate 3 may be generated due to the film vibration. In the drawing, reference numeral 5 denotes an inlet pipe passing through the center of the end plate 3, and reference numeral 7 denotes a baffle plate.

Therefore, in recent years, the thickness of the end plate has been increased for such a measure, or a two-plate structure in which the end plate is opposed via a hollow portion as disclosed in Japanese Utility Model Laid-Open No. 60-173618. Silencers have been proposed.

[Problems to be solved by the invention]

However, it has been pointed out that the conventional structure in which the end plate is thick as described above has a disadvantage that the silencer becomes heavy in weight. Further, in the conventional example in which the end plate has a two-plate structure opposed to each other with a hollow portion interposed therebetween, although the generation of radiated sound is reduced by the hollow portion, the end plate is still formed from a flat plate-shaped end plate. Radiation sound was generated due to membrane vibration. Although a two-plate structure was used, the end plate was formed of a flat plate, so that a certain plate thickness had to be ensured, and a significant reduction in weight could not be expected.

The present invention has been devised in view of the above circumstances, and an object of the present invention is to provide a vehicle silencer in which the radiation noise generated from the end plate is reduced and the end plate is reduced in weight.

[Means for solving the problem]

In order to achieve such an object, a muffler for a vehicle according to claim 1 has a muffler in which an inlet pipe and an outlet pipe penetrating the end plate are inserted into a cylindrical shell whose both ends are closed by an end plate. In the vessel,
The end plate is formed of a plurality of plates, and the outer peripheral portions of the plurality of plates are laminated and integrally joined to the edge of the cylindrical shell, and at least one of the outermost or innermost one The plate is formed into a spherical shape,
At least one hollow portion is provided between the plates, and an opening communicating with the hollow portion is provided in one of the innermost plate and the inlet pipe.

According to a second aspect of the present invention, in the vehicle silencer, a small hole communicating the hollow portion and the inside of the inlet pipe is formed in a peripheral wall of the inlet pipe located in the hollow portion.

According to a third aspect of the present invention, the spherical plate is formed in an arc-shaped cross section between an outer peripheral portion wound around a shell and a penetrating portion of an inlet pipe and an outlet pipe. It is.

Further, the invention according to claim 4 is such that the plate formed in a spherical shape is projected to the inside of the shell, and the invention according to claim 5 is such that the plate is projected to the outside of the shell. .

[Action]

According to the invention described in each claim, the hollow portion formed between the plates aims to reduce radiated sound, and the stress applied to the spherical plate is dispersed and the strength of the end plate is improved, and as a result, The membrane vibration of the end plate is reduced, and the generation of radiation noise is prevented.

In addition, since a small hole is bored or a tube is attached to the inlet pipe as an opening communicating with the hollow portion, the opening prevents rupture of the end plate due to thermal expansion in the hollow portion and reduces the hollow portion. It functions as one resonance room. Further, by providing the opening in the inlet pipe in this manner, of the exhaust noise transmitted through the inlet pipe into the muffler, the noise of the order component in the low-frequency region that is muffled in the vehicle interior is reduced, Prevents muffled noise in the cabin.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a partial cross-sectional view of a vehicle silencer according to a first embodiment of the present invention. In the shell, both ends of the shell 9 are connected to the inner plate 11a.
And an end plate 11 comprising an outer plate 11b. The outer peripheral portions of the inner plate 11a and the outer plate 11b are stacked and integrally connected to the end of the shell 9 by tightening.

As shown in FIG. 1, the inner plate 11a is formed of a single spherical plate whose entire inner plate 11a protrudes inside the shell 9.
A hollow portion 15 through which the inlet pipe 13 penetrates is formed between the outer pipe 11b and the flat outer plate 11b.

A small hole 17 is formed in the inner plate 11a. The small hole 17 prevents the end plate 11 from being ruptured due to thermal expansion in the hollow portion 15, and the hollow portion 15 functions as one resonance chamber. It is made to let.

Although not shown, an outlet pipe is inserted into the other end plate facing the end plate 11 in a straight line with the inlet pipe 13, and the inner plate of the end plate through which the outlet pipe passes also has the above-mentioned structure. Like the end plate 11, the entire inner plate is formed of one spherical plate protruding inside the shell 9, and has a structure in which a hollow portion is formed between the inner plate and the outer plate. In addition, in FIG. 1, reference numeral 19 denotes a baffle plate.

Since the present embodiment is configured as described above, after the exhaust gas discharged from the engine is introduced into the muffler from the inlet pipe 13, the exhaust gas expands and dampens in the expansion chamber in the muffler. Due to the resonance damping action in the resonance chamber, the exhaust noise is silenced.

And, like the hollow portion in Japanese Utility Model Application Laid-Open No. 60-173618, the hollow portion 15 prevents generation of radiated sound, but since the inner plate 11a in this embodiment is a spherical plate, Compared to the conventional flat end plate shown in FIG. 10 and Japanese Utility Model Publication No. 60-173618, the stress applied to the inner plate 11a is dispersed and the strength of the end plate 11 is improved,
As a result, occurrence of membrane vibration from the end plate 11 is prevented.

Therefore, according to the present embodiment, it is possible to reliably prevent the generation of radiated sound as compared with the related art by reducing the radiated sound due to the hollow portion 15 and reducing the film vibration due to the improvement in the strength of the inner plate 11a formed of a spherical plate. It became.

In addition, since the inner plate 11a formed of a spherical plate as described above has strength as compared with a conventional flat plate end plate, the inner plate 11a has the same strength as a conventional flat plate end plate with a thin plate. And as a result,
As a result, the weight of the end plate 11 and thus the entire silencer can be reduced.

FIG. 2 shows a second embodiment of the present invention. In this embodiment, instead of the inner plate 11a provided with the small hole 17, an end plate 21 protrudes into the outer plate 11b and the inside of the shell 9. The inner plate 21a is formed of one spherical plate, and a hollow portion 23 is formed between the inner plate 21a and the outer plate 11b. A small hole 25 communicating the hollow portion 23 and the inside of the inlet pipe 13 is formed in the peripheral wall of the inlet pipe 13 located in the hollow portion 23.

Since other configurations are the same as those of the first embodiment, the same components are denoted by the same reference numerals and the description of those structures is omitted.

Thus, according to this embodiment, as in the first embodiment, the generation of radiated sound can be reliably prevented and the weight of the entire silencer can be reduced.
Since the small hole 25 is provided in the inlet pipe 13 instead of the above, the small hole 25 prevents the end plate 21 from being ruptured due to thermal expansion, and the hollow portion 23 can of course function as one resonance chamber. According to the present embodiment, since the small holes 25 are formed in the above-described portion of the inlet pipe 13, of the exhaust noise propagated into the shell 9 through the inlet pipe 13, the low-frequency The noise of the order component of the area can be reduced, and therefore, it has an excellent effect as a countermeasure against the muffled noise in the vehicle compartment as compared with the above embodiment.

Further, according to the present embodiment, since a small hole may be provided in the peripheral wall of the inlet pipe 13, the small hole 17 is formed in the inner plate 11a.
The processing is simpler than in the above-described embodiment in which is provided.

FIG. 3 shows a third embodiment of the present invention.
Reference numeral 27a denotes an inner plate 27a formed of a spherical plate protruding in an arc-shaped cross section into the shell 9 between the outer peripheral portion wound around the shell 9 and the inlet pipe 13 penetrating the center of the end plate 27. In this embodiment, the end plate 27 is formed by the inner plate 27a and the outer plate 11b, and the hollow portion 29 is formed between the inner plate 27a and the outer plate 11b. A small hole 31 is formed in the inner plate 27a as in the first embodiment. The small hole 31 prevents breakage of the end plate 27 due to thermal expansion in the hollow portion 29, and prevents the end portion 27 from being damaged. 29 functions as one resonance room.

Although not shown, an outlet pipe is inserted into the other end plate facing the end plate 27 in a straight line with the inlet pipe 13, and the inner plate of the end plate through which the outlet pipe passes also has Similarly to the end plate 27, the space between the outer peripheral portion wound around the shell 9 and the outlet pipe protrudes inside the shell 9 in an arc-shaped cross section, and a hollow portion is formed between the inner plate and the outer plate. It has a structure.

Thus, this embodiment also has an advantage that the generation of radiated sound can be reliably prevented and the weight of the entire silencer can be reduced, as in the first embodiment.

FIG. 4 shows a fourth embodiment of the present embodiment. In this embodiment, instead of the flat outer plate 11b, an outer plate 33a is formed by a spherical plate that projects in the same direction as the inner plate 27a. The outer plate 33a and the inner plate 27a constitute an end plate 33 having a hollow portion 35. The other configuration is the same as that of the third embodiment.

Thus, according to this embodiment, as in the first embodiment, the generation of radiated sound can be reliably prevented, and the weight of the entire silencer can be reduced. 33 is composed of the spherical inner plate 27a and the outer plate 33a, so that the strength of the end plate 33 is further improved as compared with the above-described embodiments, and radiation noise can be reduced more reliably. Weight can be further reduced.

Also, instead of the inner plate 27a of FIG. 3, an inner plate 37a whose curvature is changed between the portions A and B as shown in FIG. 5, for example, is used, and the inner plate 37a and the outer plate 11b form a hollow portion. An end plate 37 having 39 may be formed. A small hole 41 is formed in the inner plate 37a as in the first embodiment. The small hole 41 prevents the end plate 37 from being damaged due to thermal expansion in the hollow portion 39, and prevents the hollow portion 39 from being damaged. Function as a resonance chamber.

Thus, according to the present embodiment, the intended purpose can be achieved similarly to the first embodiment.

FIG. 6 shows a sixth embodiment of the present invention. In this embodiment, the same components as those in the embodiment shown in FIG. 1 are denoted by the same reference numerals, and the description of the structure is omitted.

In the figure, reference numeral 43 denotes an end plate that closes both end openings of the shell 9, and the end plate 43 includes an inner plate 43a and an outer plate 43b.

The outer plate 43b is formed of a plate that projects between the outer peripheral portion wound around the shell 9 and the inlet pipe 13 that passes through the center of the end plate 43 to the outside of the shell 9 in an arc-shaped cross section. A hollow portion 45 is formed between the outer plate 43b and the flat inner plate 43a. And the inner plate
A small hole 47 is formed in 43a, which prevents the end plate 43 from being ruptured due to thermal expansion in the hollow portion 45 and allows the hollow portion 45 to function as one resonance chamber. ing.

Although not shown, an outlet pipe is inserted into the other end plate facing the end plate 43 in a straight line with the inlet pipe 13, and the end plate also has the same structure as the end plate 43. ing.

The present embodiment is configured as described above, and also in this embodiment, similarly to the first embodiment, the radiated sound is reduced by the hollow portion 45 and the outer plate 43b including the spherical plate is used.
This has the effect that the generation of radiated sound can be prevented more reliably than in the prior art due to the reduction of the membrane vibration due to the improvement in the strength of the film.

In addition, since the outer plate 43b formed of a spherical plate as described above has strength as compared with a conventional flat plate end plate, the outer plate 43b has the same strength as a conventional flat plate end plate with a thin plate. And as a result,
As in the first embodiment, the weight of the end plate 43 and thus the entire silencer can be reduced.

FIG. 7 shows a seventh embodiment of the present invention. In this embodiment, an outer plate 4 is used instead of the flat inner plate 43a.
An inner plate 49a is formed by a spherical plate protruding in the same direction as 3b, and an end plate 49 having a hollow portion 51 is constituted by the inner plate 49a and the outer plate 43b. And the inner plate 49
A small hole 53 is formed in a to prevent the end plate 49 from bursting due to thermal expansion and to make the hollow portion 51 function as a resonance chamber.

FIG. 8 shows another embodiment of the present invention. In this embodiment, an end plate 55 for closing both ends of the shell 9 is provided by an inner plate 27a shown in FIG. 3 and an outer plate 43b shown in FIG. It is formed by two spherical plates, and a hollow portion 57 is formed between both plates 27a and 43b.

Thus, both of these embodiments have the advantage that the generation of radiated sound can be reliably prevented and the weight of the entire silencer can be reduced, as in the above embodiments. Further, in these embodiments, the end plates 49 and 55 are constituted by the spherical inner plates 49a and 27a and the outer plate 43b, respectively, so that the same effects as those of the embodiment shown in FIG. 4 are obtained. It is possible.

In each of the above embodiments except for FIG. 2, small holes are formed in the inner plate. For example, as shown in FIG. 9, the small holes 31 of the embodiment in FIG. A tube 59 communicating with the hollow portion 57 may be inserted into the 27a, and according to such a structure, compared to a case where the small holes 31 are formed in the inner plate 27a, the sound can be reduced by adjusting the diameter of the tube 59 or the like. The effect of attenuating low-frequency exhaust noise can be more expected in combination with the operation of the resonance chamber in the vessel. In FIG. 9, reference numeral 61 denotes an outlet pipe.

Further, in each of the above embodiments, the end plate is formed of two inner plates and the outer plate. However, the end plate of the vehicle silencer according to the present embodiment may be formed of three or more plates. In this case, a hollow portion may be formed between the plates, or a hollow portion may be formed at at least one position between the plates.

In addition, each of the above embodiments has a structure in which the inlet pipe and the outlet pipe are inserted in a straight line. However, the present invention is not limited to such a structure. They can be staggered. In this case, it goes without saying that the shape of the end plate is variously changed in accordance with the insertion positions of these pipes.

[Effect of the invention]

As described above, according to the invention described in each claim,
Due to the reduction of the radiated sound by the hollow part and the reduction of the membrane vibration by the improvement of the strength of the spherical plate, the generation of the radiated sound from the end plate can be surely prevented as compared with the conventional case.

Further, as described above, since the spherical plate has strength as compared with the conventional flat plate end plate, the same strength as the flat plate end plate can be secured by a thin plate, and as a result, the end plate and eventually the end plate The overall weight of the silencer can be reduced.

In addition, according to the invention of claim 2, the small holes provided in the inlet pipe prevent the end plate from being ruptured due to thermal expansion, and the hollow part can function as one resonance chamber. Out of the exhaust noise transmitted through the muffler through the noise, the noise of the order component in the low-frequency region, which is a muffled sound in the vehicle interior, can be reduced. Has an effect.

[Brief description of the drawings]

FIG. 1 is a partial sectional view of a vehicle silencer according to a first embodiment of the present invention. FIG. 2 is a partial sectional view of a vehicle silencer according to a second embodiment of the present invention. FIG. 3 is a partial sectional view of a vehicle silencer according to a third embodiment of the present invention. FIG. 4 is a partial sectional view of a vehicle silencer according to a fourth embodiment of the present invention. FIG. 5 is a partial sectional view of a vehicle silencer according to a fifth embodiment of the present invention. FIG. 6 is a partial sectional view of a vehicle silencer according to a sixth embodiment of the present invention. FIG. 7 is a partial sectional view of a vehicle silencer according to a seventh embodiment of the present invention. FIG. 8 is a partial sectional view of a vehicle silencer according to another embodiment of the present invention. FIG. 9 is a partial sectional view of a vehicle silencer according to another embodiment of the present invention. FIG. 10 is a partial sectional view of a conventional vehicle silencer. [Explanation of Signs of Main Parts] 9 Shell 11,21,27,33,37,43,49,55 End plate 11a, 21a, 27a, 37a, 43a, 49a Inner plate 11b, 33a , 43b Outer plate 13 Inlet pipe 15,23,29,35,39,45,51,57 Hollow section.

Claims (5)

(57) [Scope of request for utility model registration] An end plate (3, 11, 21, 27, 3)
3,37,43,49,55) in a cylindrical shell (1,9) closed by
In the silencer having the inlet pipe (13) and the outlet pipe (61) inserted through the end plate (3, 11, 21, 27, 33, 37, 43, 49, 55), the end plate (3,11,21,27,33,37,43,49,55) with multiple plates (1
1a, 11b, 21a, 27a, 33a, 37a, 43a, 43b, 49a) and a plurality of these plates (11a, 11b, 21a, 27a, 33a, 37a,
43a, 43b, 49a) and a cylindrical shell (1, 9)
And at least one of the outermost or innermost plates (11a, 21a, 27a, 33a, 37a,
43b, 49a) are formed in a spherical shape, and each plate (11a, 11b, 21)
a, 27a, 33a, 37a, 43a, 43b, 49a) and at least one hollow portion (15, 23, 29, 35, 39, 45, 51, 57) is provided. 23,29,35,39,45,51,57) and the opening (17,25,31,41,47,53,59) communicating with the innermost plate (11a,
21a, 27a, 37a, 43a, 49a) or inlet pipe (13)
A vehicle silencer provided on any one of the above. 2. The hollow portion (15, 23, 29, 35, 39, 45, 51, 57)
On the peripheral wall of the inlet pipe (13) located at the bottom, there is a small hole (25) communicating the hollow part (15,23,29,35,39,45,51,57) with the inside of the inlet pipe (13). The vehicle silencer according to claim 1, wherein the silencer is provided. 3. The plate (11a, 21a) formed in a spherical shape.
a, 27a, 33a, 37a, 43b, 49a) are cross-sections between the outer peripheral portion wound around the shell (9) and the through portions of the inlet pipes (5, 13) and the outlet pipe (61). The vehicle muffler according to claim 1, wherein the muffler is formed in an arc shape. 4. The plate (11a.21) having a spherical shape.
The muffler for a vehicle according to any one of claims 1 to 3, wherein the a, 27a, 33a, 37a, 43b, 49a) protrude inside the shell (9). 5. The plate (11a, 21) formed in a spherical shape.
The muffler for a vehicle according to any one of claims 1 to 3, wherein a, 27a, 33a, 37a, 43b, 49a) protrude outside the shell (9).