JP2000337126A - Muffler cutter and muffler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a muffler cutter and a muffler capable of improving the durability and reliability thereof while preventing the lowering of appearance quality. SOLUTION: A muffler 11 arranged in a vehicle is provided with an elliptic cylindrical muffler main body, a front plate and a rear plate for closing both ends of the muffle main body, an exhaust pipe and a tail pipe 16 inserted into the muffler main body, and a muffler cutter 17. The muffler cutter 17 is provided with a muffler cutter main body 19 and an enamel layer 20. The muffler cutter main body 19 is formed of a curved part 21 formed by folding a tip inside. Curvature radius of the curved part 21 is set at 2 mm, and the outer surface side of the curved part 2 is formed of an enamel layer 20 at an even thickness. A part of the muffler cutter 17, which is visually confirmed from rear of the vehicle, is formed with the enamel layer 20 at a nearly even thickness and colored.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a muffler cutter and a muffler constituting a part of a vehicle exhaust system, and more particularly to a muffler cutter and a muffler used as a decorative member.

[0002]

2. Description of the Related Art As is well known, a muffler (silencer) made of a metal material (for example, stainless steel) is provided in a part of an exhaust system of a vehicle to suppress noise generated when the vehicle is exhausted. Has been established. This type of muffler includes, for example, a substantially cylindrical muffler main body, a front plate and a rear plate closing both ends of the muffler main body, an exhaust pipe inserted into the muffler main body through the front plate, and A tail pipe inserted into the muffler body via the rear plate.

[0003] When the muffler provided in the vehicle is viewed from the rear of the vehicle, the tailpipe is particularly visible. Therefore, the tailpipe is plated.
That is, after the surface of the tail pipe is polished so as to be uniform, the surface is plated with a metal such as chrome, for example, to prevent irregular reflection of light on the tail pipe and to improve the appearance. I have.

Further, the tail pipe of the muffler is formed of a metal material (for example, stainless steel) without being subjected to the plating treatment, and is formed in a substantially cylindrical shape which is subjected to the same plating treatment as that of the tail pipe described above. May be installed.

However, when plating is performed on the surfaces of the tail pipe and the muffler cutter, it is difficult to polish the entire surface of the tail pipe and the muffler cutter to be uniform. Cannot be completely prevented, and there is a limit to improving the appearance. Further, even when the tail pipe and the muffler cutter of the muffler disposed in the vehicle are visually recognized from the rear of the vehicle, they have only a metallic color (silver color), so that the decorativeness is poor.

Conventionally, the outer surfaces of the muffler cutter and the tail pipe of the muffler are painted with heat-resistant paint and colored to improve the appearance of the muffler cutter and the muffler and to improve their appearance quality. ing.

[0007]

However, when the above-mentioned heat-resistant paint is used, the coating layer formed on the surface of the muffler cutter and the tail pipe is excellent in heat resistance, but the nitrogen oxide or the like is used. May be discolored or expanded under the influence of an exhaust gas containing the same.
For this reason, the appearance of the muffler cutter and the muffler may be deteriorated, and their appearance quality may be reduced.

Further, since the strength of the coating layer may be reduced due to the discoloration and expansion of the coating layer, for example, when a stone or sand splashes and collides with the coating layer during running of the vehicle, the coating layer may be damaged. There was also a possibility that cracks, breakage, and the like may occur in the film layer.
As a result, water, muddy water, and the like intrude from cracks and breaks in the coating film layer and reach metal surfaces such as a muffler cutter and a tail pipe. In addition, dirt easily adheres to cracks, breakage, and the like of the coating film layer, and it is difficult to remove the adhered dirt, thereby further deteriorating the appearance quality.

As described above, when water or muddy water, for example, comes into contact with the metal surface of the muffler cutter and the tail pipe of the muffler, the contact portion is easily corroded, and the coating layer is easily peeled off from the corroded portion. To become
The durability and reliability of the muffler cutter and the muffler may be significantly reduced.

The present invention has been made in view of the above circumstances, and has as its object to muffler cutters capable of preventing a decrease in appearance quality and improving the durability and reliability thereof. And muffler.

[0011]

In order to achieve the above object, the muffler cutter according to the first aspect of the present invention is characterized in that an enamel layer is formed on at least the outer surface of a substantially cylindrical muffler cutter body and colored. Make a summary.

According to the first aspect of the present invention, a muffler cutter provided in a vehicle includes a substantially cylindrical muffler cutter body and an enamel layer formed on an outer surface of the muffler cutter body. At least a part, particularly the enamel layer, is visible from behind the vehicle. Here, since the enamel layer is colored, the appearance of the muffler cutter is good even when the muffler cutter is viewed from behind the vehicle.

Further, since the strength of the enamel layer is higher than that of the prior art coating layer, the enamel layer is less likely to crack or break. Further, since the enamel layer is glassy, dirt is hardly adhered to the enamel layer, and the adhered dirt is easily removed. Therefore, the appearance of the enamel layer is unlikely to be degraded, so that the appearance quality of the enamel layer, and hence the muffler cutter, is prevented from being degraded. As described above, by maintaining the appearance quality of the muffler cutter in a good state, the durability and reliability of the muffler cutter can be improved.

According to a second aspect of the present invention, in the muffler cutter according to the first aspect, the one end of the muffler cutter body is bent inward to form a curved portion, and the one end including the curved portion is formed. The gist is that an enamel layer is formed on the outer surface side of and colored.

According to the second aspect of the present invention, in addition to the function of the first aspect of the present invention, one end of the muffler cutter body is bent inward to form a curved portion. The inside of the muffler cutter provided in the vehicle, in particular, the portion corresponding to the outer surface of one end including the curved portion of the muffler cutter may be visible from the rear of the vehicle. Here, since the enamel layer is formed and colored on the outer surface of the one end including the curved portion, even when the inside of the muffler cutter is visually recognized from the rear of the vehicle, its appearance is good.

According to a third aspect of the present invention, in the muffler cutter according to the second aspect, the muffler cutter main body is formed of stainless steel, and a radius of curvature of the curved portion is 0.75 mm or more and less than 5 mm. It is the gist that it is.

According to the third aspect of the invention, since the muffler cutter body is formed of stainless steel having excellent corrosion resistance, the durability and reliability of the muffler cutter can be further improved. Further, when the radius of curvature of the curved portion of the muffler cutter body is set to a size of 0.75 mm or more and less than 5 mm, the enamel layer is reliably formed in a favorable state on the outer surface of one end portion including the curved portion of the muffler cutter body. Therefore, the operation of the invention described in claim 2 is reliably achieved.

Here, the radius of curvature of the curved portion is 0.75 mm.
The reason why the size of the enamel layer is less than 5 mm is that when the enamel layer is less than 0.75 mm, the metal surface of stainless steel is visible from the outside through the enamel layer, or the enamel layer is from one end including the curved portion of the muffler cutter body. This is because there is a possibility that the muffler cutter is peeled off, and if the thickness is 5 mm or more, the curved portion becomes too large and the muffler cutter may not be reduced in size.

According to a fourth aspect of the present invention, there is provided a muffler including the muffler cutter according to any one of the first to third aspects.

According to the fourth aspect of the present invention, there is provided a muffler provided with a muffler cutter having the function of any one of the first to third aspects of the present invention.

According to a fifth aspect of the present invention, there is provided a muffler body having a substantially cylindrical shape, a front plate and a rear plate closing both ends of the muffler body, and an exhaust gas inserted into the muffler body via the front plate. In a muffler provided with a pipe and a tail pipe inserted into the muffler body via the rear plate, an enamel layer is formed and colored on at least the outer surface of the tail pipe.

According to the fifth aspect of the present invention, the muffler provided in the vehicle includes a substantially cylindrical muffler main body, a front plate and a rear plate for closing both ends of the muffler main body, An exhaust pipe inserted into the muffler main body through the plate, and a tail pipe inserted into the muffler main body through the rear plate, at least a part of the muffler, particularly the tail pipe and the like are visually recognized from the rear of the vehicle. You. Here, at least on the outer surface of the tail pipe, since the enamel layer is formed and colored, even when the muffler is viewed from behind the vehicle,
The appearance of the muffler, especially the tailpipe, is good.

Further, since the strength of the enamel layer is higher than that of the coating film layer of the prior art, the enamel layer is less likely to crack or break. Further, since the enamel layer is glassy, dirt is hardly adhered to the enamel layer, and the adhered dirt is easily removed. Therefore, the appearance of the enamel layer is less likely to be degraded, so that the appearance quality of the tailpipe and, consequently, the muffler is prevented from being degraded. As described above, by maintaining the appearance quality of the muffler in a favorable state, the durability and reliability of the muffler can be improved.

According to a sixth aspect of the present invention, in the muffler according to the fifth aspect, an enamel layer is formed on the outer surface side of the rear plate and colored.

According to the sixth aspect of the present invention, since the enamel layer is also formed on the outer surface side of the rear plate and is colored, when the muffler provided in the vehicle is viewed from the rear of the vehicle, the tail pipe is formed. Not only that, the appearance of the rear plate also improves, and the effect of the invention described in claim 5 can be more reliably achieved.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) A first embodiment of the present invention will be described below with reference to FIGS. The muffler according to the present embodiment is provided in a part of a vehicle exhaust device (not shown) in order to suppress noise generated when a vehicle (not shown) is exhausted.
FIG. 2 is a perspective view schematically showing the entire muffler according to the first embodiment.

As shown in FIG. 2, the muffler 11 of the present embodiment comprises an elliptical cylindrical muffler body 12, a front plate 13 and a rear plate 14 for closing both ends of the muffler body 12, and The exhaust pipe 15 is inserted into the muffler main body 12 through the exhaust pipe 13, the tail pipe 16 is inserted into the muffler main body 12 through the rear plate 14, and the muffler cutter 17.

Muffler body 12, front plate 13
And the rear plate 14 is formed from stainless steel. The front plate 13 and the rear plate 14
The muffler body 12 is formed in an elliptical plate shape corresponding to the shape of the opening. The muffler main body 12, the front plate 13 and the rear plate 14 are joined by a joining means (not shown) so that the exhaust gas does not leak.

The exhaust pipe 15 is made of stainless steel and plays a role of introducing exhaust gas into the muffler main body 12. The tail pipe 16 is also connected to the exhaust pipe 15.
It is made of stainless steel as well. The tail pipe 16 exhausts exhaust gas muffled in the muffler main body 12 to the rear of the vehicle via a muffler cutter 17. Airtightness is maintained between the front plate 13 and the exhaust pipe 15 and between the rear plate 14 and the tail pipe 16 so that exhaust gas does not leak. Due to the muffling effect of the muffler 11, noise generated at the time of exhaust is suppressed.

Muffler cutter 17 as decorative member
Is mounted on the tail pipe 16 and the muffler cutter 17 is visible from the rear of the vehicle, that is, FIG.
Are colored in portions indicated by dotted patterns. The same color or the same color as that of the vehicle body or bumper is used as the color to be colored. When the muffler 11 is provided in the vehicle, the muffler cutter 17 and the like are mainly visible from the rear of the vehicle.

FIG. 1 is a cross-sectional view schematically showing a state in which the muffler cutter according to the present embodiment is externally fitted to a tail pipe. FIG. 3 is a front view schematically showing the internal structure of the muffler cutter in which the enamel layer is omitted.

As shown in FIG. 1, the tail pipe 16 is
It is formed in a substantially cylindrical shape, and a flange 18 is formed at its tip (the right part in FIG. 1). The flange 18 is formed by bending the distal end portion of the tail pipe 16 so as to be curved outward.
The muffler cutter 17 includes a muffler cutter body 19 formed in a substantially cylindrical shape from stainless steel, and a vitreous enamel layer 20 formed on at least the outer surface thereof.

As shown in FIGS. 1 and 3, the muffler cutter body 19 has a curved portion 21 formed by bending a tip end (one end) of the muffler cutter body inward, and the muffler cutter body 19 is formed from the curved portion 21. An annular inclined portion 22 extending so as to decrease in diameter toward the inside of the inside 19, and a contact portion formed from the inclined portion 22 toward the base end side (the other end side) of the muffler cutter body 19. The muffler cutter body 19 includes a stepped portion 24 formed in the center of the lower portion thereof, and a notch portion 25 formed by cutting out a lower portion of a base end (the other end) of the muffler cutter body 19.

Hereinafter, the curved part of the muffler cutter body and the enamel layer in the present embodiment will be described in detail. FIG. 4 is an enlarged cross-sectional view showing an end surface structure of the muffler cutter for explaining a problem of an enamel layer formed on an end surface of the muffler cutter main body.
FIG. 5 is an enlarged cross-sectional view showing a curved portion of the muffler cutter main body.

As shown in FIG. 4, when the enamel layer 102 is formed on the end face (tip edge) of the muffler cutter main body 101, the enamel layer 102 having a substantially uniform thickness as shown by a two-dot chain line in the figure. There was a possibility that the enamel layer 102 having a non-uniform thickness which was not formed and was concave due to the influence of surface tension or the like was formed. As a result, the recessed portion of the enamel layer 102 and the vicinity thereof have insufficient strength and the like, which may cause the enamel layer 102 to peel off from the muffler cutter main body 101 or to deteriorate the appearance. I was

Therefore, in this embodiment, as shown in FIGS. 1 and 5, in order to prevent the end face structure of the muffler cutter main body 19 from adopting the end face structure, the front end of the muffler cutter main body 19 is turned inside. The muffler cutter body 19 is bent so as to form a curved portion 21 at the tip edge.

Here, as shown in FIG. 5, the curvature radius Ra of the curved portion 21 is set to, for example, 2 mm, and the enamel layer 20 having a uniform thickness is formed on the outer surface side of the curved portion 21 and the like. It is colored. The curvature radius Ra of the curved portion 21
Is preferably a size of 0.75 mm or more and less than 5 mm,
A size of 1 mm or more and 3 mm or less is more desirable.
In the case of less than 0.75 mm, the metal surface of the muffler cutter body is visible from the outside through the enamel layer,
This is because the enamel layer may peel off from the curved portion, the inclined portion, or the like, and if the enamel layer is 5 mm or more, the curved portion becomes too large and the muffler cutter may not be reduced in size.

As shown in FIGS. 1 and 3, the boundary between the inclined portion 22 and the contact portion 23 is bent so as to be curved. The end face of the contact portion 23 contacts the flange 18 of the tail pipe 16 so that the tail pipe 16
The movement of the muffler cutter 17 is restricted. An insertion hole 27 for inserting a bolt 26 is provided through the step portion 24. The notch 25 is formed in a lower portion of the muffler cutter main body 19 by being cut out in a square shape from the base end to the step portion 24.

An end layer of the muffler cutter body 19, that is, an outer surface side of the curved portion 21, the inclined portion 22, the contact portion 23, and the like is colored with an enamel layer 20 having a substantially uniform thickness. The enamel layer 20 having a substantially uniform thickness is also formed on the outer surface side of the step portion 24 and is colored. In the muffler cutter 17 of the present embodiment, the enamel layer 20 having a substantially uniform thickness is formed and colored in a portion where the muffler cutter 17 is visually recognized from the rear of the vehicle. The enamel layer 20 is provided on the muffler cutter body 19.
After a shot blasting process is performed on the outer surface side of the device, a glaze is applied from above and baked to form a predetermined thickness and exhibit a predetermined color.

Hereinafter, the constituent members disposed inside the muffler cutter body and the like in the present embodiment will be described in detail.

As shown in FIGS. 1 and 3, inside the muffler cutter main body 19, a support member 28 made of stainless steel is fixed to the upper portion on the base end side, and the support member 28 is similarly attached to the distal end side. An annular member 29 made of stainless steel is fixed. A nut 30 is fixed to the inner surface of the step portion 24 of the muffler cutter body 19, that is, to a position corresponding to the insertion hole 27.

The support member 28 includes three plate-like legs 31.
And a pair of plate-like housing portions 32 connecting them, and are integrally formed. The leg 31 is joined to the inner surface of the muffler cutter main body 19 by spot welding. The surface of the housing portion 32 on the side that contacts the tail pipe 16 is formed to have a curved shape corresponding to a part of the outer peripheral surface of the tail pipe 16. When the tail pipe 16 comes into contact with the curved surfaces of the housing portions 32, the tail pipe 1
The muffler cutter 17 is supported with respect to 6.

The annular member 29 is formed of the ring-shaped main body 3.
3, a joining portion 34 bent to be perpendicular to the ring portion main body 33, and a support portion 35 extending from the ring portion main body 33 to the inner surface of the abutment portion 23. Are integrally formed. The joining portion 34 is joined to the inner surface of the muffler cutter main body 19 by spot welding.
The support portion 35 is formed in a curved shape so as to support the flange 18 of the tail pipe 16.

The lower four corners of the nut 30 are welded to the inner surface at the center of the step portion 24. Then, in the mode shown in FIG. 1, the bolt 26 is inserted through the insertion hole 27 and the bolt 26 is screwed into the nut 30, so that the movement of the muffler cutter 17 with respect to the tail pipe 16 is restricted, and The state is maintained. Conversely, when the bolt 26 is retreated from the nut 30, the movement restriction of the muffler cutter 17 with respect to the tail pipe 16 is released, and the muffler cutter 17 can be detached from the tail pipe 16.

Now, in order to fit the muffler cutter 17 in the present embodiment by fitting it externally to the tail pipe 16,
First, the base portion side of the muffler cutter 17 is fitted from the flange 18 side of the tail pipe 16 so that the contact portion 23 of the muffler cutter body 19 abuts on the flange 18 and at the same time, the support portion of the annular member 29. 35 is the flange 1
8 until it is supported. At this time, the support member 28
Since the curved surface of the accommodating portion 32 is in contact with and supported by the outer surface of the tail pipe 16, the support member 28, and eventually the muffler cutter 17, is fitted and supported on the tail pipe 16. Finally, in order to maintain the fitting support state of the muffler cutter 17 with respect to the tail pipe 16, it is securely fixed in a manner shown in FIG. As described above, the muffler 11 in which the muffler cutter 17 is mounted on the tail pipe 16 is obtained.

According to the embodiment described above, the following effects can be obtained.

In the present embodiment, the enamel layer 20 is formed on the outer surface of the muffler cutter 17 of the muffler 11 provided in the vehicle, and the same color or the same color as the vehicle body or the bumper is applied. did. For this reason, the muffler 11
The appearance of the muffler 11, especially the muffler cutter 17, can be improved even when the vehicle is viewed from behind the vehicle.

According to the enamel layer 20 of the present embodiment, since its strength is higher than that of the above-mentioned prior art coating layer, the enamel layer 20 is less likely to crack or break.
For this reason, the appearance of the enamel layer 20 is less likely to be degraded, so that the appearance quality of the enamel layer 20 and thus the muffler cutter 17 can be prevented from deteriorating.

In this embodiment, the muffler cutter 1
7, a vitreous enamel layer 20 was formed on at least the outer surface. For this reason, it is possible to suppress adhesion of dirt to the enamel layer 20, and even if dirt is attached, the dirt can be easily removed. That is, by wiping the outer surface and the like of the muffler cutter 17 with a cloth or the like, or by washing with water or the like,
Dirt on the muffler cutter 17 can be easily removed, and the function of the enamel layer 20 on the muffler cutter 17 can be sufficiently exhibited.

According to the present embodiment, the muffler 11
In particular, since the appearance quality of the muffler cutter 17 can be maintained in a good state, the durability and reliability of the muffler cutter 17 in the muffler 11 can be improved.

In the present embodiment, the distal end of the muffler cutter main body 19 is bent inward to form a curved portion 21 at the distal end edge of the muffler cutter main body 19. Therefore, the enamel layer 20 having a substantially uniform thickness can be formed also on the outer surface side of the curved portion 21.

In this embodiment, the radius of curvature of the curved portion 21 is 2 mm, and the enamel layer 20 having a substantially uniform thickness is formed on the outer surface of the curved portion 21. For this reason, the metal surface of the muffler cutter main body 19 can be seen from the outside through see-through, or the enamel layer 20 can be
9 can be suppressed from being separated from the curved portion 21 and the inclined portion 22.

According to the present embodiment, since the base material constituting the muffler 11 is stainless steel having excellent corrosion resistance, the durability and reliability of the muffler 11 can be further improved. (Second Embodiment) Next, a second embodiment of the present invention will be described with reference to FIGS. However, in the configuration and the like of the present embodiment, portions that are the same as those in the above-described first embodiment are given the same reference numerals, and descriptions thereof are omitted. The following description focuses on the differences from the first embodiment. FIG. 6 is a cross-sectional view schematically showing a state in which the muffler cutter according to the present embodiment is fitted to the tail pipe. FIG. 7 is a front view schematically showing the internal structure of the muffler cutter in which the enamel layer is omitted.

As shown in FIGS. 6 and 7, the muffler 61 of this embodiment differs from the first embodiment in the structure of the tail pipe 62 and the muffler cutter 63 and the like.

That is, the tail pipe 6 of the present embodiment
No. 2 has a shape in which the flange 18 is not formed at the front end portion and is inclined upward and to the right from the lower portion to the upper portion in the mode shown in FIG.

Further, the muffler cutter main body 64 of the present embodiment has a curved portion 65 formed by bending the front end thereof inward, and from the curved portion 65 toward the inside of the muffler cutter main body 64. And a protruding portion 66. For the same reason as described in the first embodiment, the radius of curvature Rb of the bending portion 65 is set to, for example, 3 mm. A part of the protruding portion 66 and the curved portion 65
By contacting the tip of the tail pipe 62, the movement of the muffler cutter 63 with respect to the tail pipe 62 is restricted.

Further, the support member 28 and the annular member 29 are not fixed to the inner surface of the muffler cutter 63 in the present embodiment, and three fitting members 67 are provided in the form shown in FIGS. It is fixed with. Fitting member 6
7 includes a plate-shaped fixing portion 68 and a bulging portion 69 in which a central portion of the fixing portion 68 bulges. Fixed part 68
Are joined to the inner surface of the muffler cutter body 64 by spot welding. The bulging portion 69 is formed by press molding, and its top surface has a shape corresponding to the outer peripheral surface of the tail pipe 62. When the outer peripheral surface of the tail pipe 62 comes into contact with the top surfaces of the bulging portions 69, the muffler cutter 63 is fitted and supported on the tail pipe 62.

Now, in order to fit the muffler cutter 63 in the present embodiment by fitting it externally to the tail pipe 62,
First, the projecting portion 66 of the muffler cutter main body 64 and a part of the curved portion 65 are brought into contact with the distal end of the tail pipe 62 so that the proximal end of the muffler cutter 63 is fitted from the distal end of the tail pipe 62. Fit outside until touched and supported. At this time, since the top surface of the bulging portion 69 of the fitting member 67 is supported in contact with the outer surface of the tail pipe 62, the fitting member 67, and eventually the muffler cutter 63, is fitted and supported on the tail pipe 62. Is done. Finally, in order to maintain the fitting support state of the muffler cutter 63 with respect to the tail pipe 62, the muffler cutter 63 is securely fixed in a manner shown in FIG. As described above, the muffler 61 in which the muffler cutter 63 is mounted on the tail pipe 62 is obtained.

Therefore, according to the present embodiment, effects similar to those of the first embodiment can be obtained. (Third Embodiment) Next, a third embodiment of the present invention will be described with reference to FIG. However, in the configuration and the like of the present embodiment, description will be made focusing on differences from the above-described embodiments. FIG. 8 is a cross-sectional view schematically showing a state of the tail pipe of the muffler in the present embodiment.

As shown in FIG. 8, the muffler 81 of this embodiment is different from the muffler 11 of the first embodiment.
And the muffler 61 according to the second embodiment. That is, the muffler 8 in the present embodiment
One tail pipe 82 includes a substantially cylindrical tail pipe main body 83 and an enamel layer 84 formed on at least the outer surface thereof. More specifically, the muffler cutters 17 and 63 of the above embodiments are not mounted on the tail pipe 82 of the present embodiment, and the enamel layer 84 is formed directly on the outer surface of the tail pipe body 83. Has been colored.

At the tip of the tail pipe body 83, an enlarged diameter portion 85 gradually increasing in diameter from the inside to the outside.
Is formed at the tip of the enlarged diameter portion 85, and a curved portion 86 is formed inside the enlarged diameter portion 85 so as to be curved. The curvature radius Rc of the curved portion 86 is, for example, 2.
It is set to 5 mm and bent until the end surface of the curved portion 86 contacts the inner surface of the enlarged diameter portion 85.

The enamel layer 84 is formed on the tail pipe main body 83.
After the shot blasting process is performed not only on the outer surface including the enlarged diameter portion 85 but also on the outer surface side of the curved portion 86, glaze is applied and baked thereon. The enamel layer 84 is formed with a substantially uniform thickness along the outer surface side of the tail pipe main body 83, and one end surface thereof is formed up to a portion in contact with the inner surface side of the enlarged diameter portion 85.

Therefore, according to the present embodiment, effects similar to those of the above-described embodiments can be achieved without using the muffler cutters 17 and 63 as in the above-described embodiments.

It is to be noted that each of the above embodiments can be modified and implemented as follows.

In the first embodiment and the second embodiment, the enamel layer 20 is formed and colored only on the muffler cutters 17 and 63. An enamel layer may be formed on the surface to be colored, or an enamel layer may be formed on the outer surface side of the rear plate 14 to be colored. Further, an enamel layer may be formed on the outer surface of the muffler body 12 or the like to be colored. The point is that the vehicle has mufflers 11, 61
When the mufflers 11 and 61 are provided, the enamel layer 20 may be formed and colored in a portion where the mufflers 11 and 61 are visible from the rear of the vehicle.

In the third embodiment, the muffler 8
Although the enamel layer 84 is formed only on the tail pipe 82 of the rear plate 14 and colored, for example, the enamel layer is formed on the outer surface side of the rear plate 14 and colored.
An enamel layer may be formed on the outer surface such as 2 to color. In short, when the muffler 81 was installed on the vehicle,
It is sufficient that the enamel layer 84 is formed and colored in a portion where the muffler 81 is visible from behind the vehicle.

In the above embodiments, the muffler body 1
Although 2 is formed in an elliptical cylindrical shape, it may be formed in, for example, a cylindrical shape or a rectangular cylindrical shape, and the shape of the muffler body 12 is not particularly limited to the elliptical cylindrical shape. Further, the shapes of the front plate 13 and the rear plate 14 are not particularly limited to those of the above embodiments.

In the third embodiment, a structure in which a muffler cutter is attached to the tail pipe 82 of the muffler 81 may be adopted.

In the above embodiments, the same color or the same color as that of the vehicle body or bumper is used as the color to be colored. The present invention is not particularly limited to the above embodiments. Here, when black is adopted, even if dirt adheres to the enamel layer, it is difficult to visually recognize the dirt from behind the vehicle.

In the above embodiments, the curved portions 21 and 6
The curvature radii Ra, Rb, and Rc of 5,86 are set to be not less than 0.75 mm and less than 5 mm, but are not particularly limited to the numerical values of the above embodiments.

In the first embodiment, the support member 2
Although 8 is formed integrally, it may be formed separately.
Further, the number of the support members 28 is arbitrary.

In the second embodiment, the three fitting members 67 are formed separately from each other, but they may be formed integrally, or two or four or more may be provided. You may do so.

In each of the above embodiments, the muffler 11,
Although stainless steel was used as the base material constituting 61 and 81, for example, cast iron, aluminum, magnesium and carbon may be used, and the present invention is not particularly limited to stainless steel.

Further, technical ideas which are not described in each claim of the claims but are grasped from each of the above embodiments are described below together with their effects.

(A) In the muffler according to claim 5 or 6, an end portion of the tail pipe is bent inward to form a curved portion, and the end portion including the curved portion is formed on an outer surface side of the end portion. A muffler characterized by forming an enamel layer and coloring.

With this configuration, in addition to the effects of the invention described in claim 5 or claim 6, one end including the curved portion of the tail pipe of the muffler provided in the vehicle is visually recognized from the rear of the vehicle. Even in this case, the appearance can be improved.

(B) In the muffler according to (a), the tail pipe is formed of stainless steel, and the radius of curvature of the curved portion is 0.75 mm or more and 5 mm.
A muffler characterized in that the size is less than.

With such a configuration, the effect of the invention described in the above (a) can be more reliably achieved.

[0079]

According to the first aspect of the present invention, it is possible to prevent the appearance quality of the muffler cutter from deteriorating and to improve the durability and reliability thereof.

According to the second aspect of the present invention, the first aspect
In addition to the effects of the invention described in (1), even when one end including the curved portion of the muffler cutter is visually recognized from the rear of the vehicle, the appearance of the end can be improved.

According to the invention set forth in claim 3, according to claim 2
The effects of the invention described in (1) can be reliably achieved.

According to the invention set forth in claim 4, according to claim 1
Accordingly, it is possible to obtain a muffler provided with the muffler cutter having the effect of the invention according to any one of the third aspect.

According to the fifth aspect of the present invention, it is possible to prevent the appearance quality of the muffler from deteriorating, and to improve the durability and reliability of the muffler.

According to the invention of claim 6, according to claim 5,
Can be more reliably achieved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view schematically showing a state in which a muffler cutter according to a first embodiment is externally fitted to a tail pipe.

FIG. 2 is a perspective view schematically showing a muffler according to the first embodiment.

FIG. 3 is a front view schematically showing an internal structure of a muffler cutter in which an enamel layer is omitted.

FIG. 4 is an enlarged sectional view showing an end face structure of the muffler cutter in order to explain a problem of an enamel layer formed on an end face of the muffler cutter main body.

FIG. 5 is an enlarged sectional view showing a curved portion of the muffler cutter main body.

FIG. 6 is a cross-sectional view schematically illustrating a state in which the muffler cutter according to the second embodiment is externally fitted to a tail pipe.

FIG. 7 is a front view schematically showing the internal structure of the muffler cutter from which the enamel layer is omitted.

FIG. 8 is a sectional view schematically showing a state of a tail pipe of a muffler according to a third embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Muffler 12 Muffler main body 13 Front plate 14 Rear plate 15 Exhaust pipe 16 Tail pipe 17 Muffler cutter 19 Muffler cutter main body 20 Enamel layer 21 Curved part 22 Inclined part 23 Contact part 24 Stepped part 61 Muffler 62 Tail pipe 63 Muffler cutter 64 Muffler Cutter body 65 Curved portion 66 Projected portion 81 Muffler 82 Tail pipe 84 Enamel layer 85 Large diameter portion 86 Curved portion

Claims (6)

[Claims] 1. A muffler cutter characterized in that an enamel layer is formed and colored on at least the outer surface of a substantially cylindrical muffler cutter body. 2. A muffler cutter body, wherein one end of the muffler cutter body is bent inward to form a curved portion, and an enamel layer is formed and colored on the outer surface side of the one end including the curved portion. The muffler cutter according to claim 1. 3. The muffler cutter body is formed of stainless steel, and the radius of curvature of the curved portion is 0.7.
The muffler cutter according to claim 2, wherein the size is 5 mm or more and less than 5 mm. 4. A muffler comprising the muffler cutter according to any one of claims 1 to 3. 5. A substantially cylindrical muffler body, a front plate and a rear plate for closing both ends of the muffler body, an exhaust pipe inserted into the muffler body via the front plate, and the rear plate. A muffler comprising: a tail pipe inserted through a muffler body through the end pipe; and an enamel layer is formed on at least an outer surface of the tail pipe, and the muffler is colored. 6. The muffler according to claim 5, wherein an enamel layer is formed on the outer surface side of the rear plate and colored.