JP2006017019A - Muffler cutter and accessory provided on muffler cutter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an innovative muffler cutter having an extremely high commercial value and an accessory provided on the muffler cutter. <P>SOLUTION: The muffler cutter is for a vehicle muffler device and is formed of an outer tube 2 and an inner tube 3. An evacuated layer 6 produced by evacuation is provided between the tubes. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a muffler cutter and accessories provided in the muffler cutter.

  As shown in FIG. 1, a vehicle muffler device M such as an automobile or a motorcycle includes an exhaust pipe 8 that is connected to an engine and guides exhaust gas generated by the engine, and a silencer 9 that is provided at an end of the exhaust pipe 8. (Silencer) and a muffler cutter 1 (tail pipe) that projects from the end of the silencer 9 and exhausts exhaust gas into the atmosphere. Reference numeral 7 denotes a catalyst (converter) that reduces harmful components in the exhaust gas.

  Incidentally, in recent years, there has been an increasing demand for spoilers (aero parts) provided around the body of an automobile for the purpose of improving air resistance and dressing up in the body of the automobile.

  Specifically, the rear spoiler A (spoiler arranged in the rear part of the body of the car) is not the type shown in FIG. 3 but a design in which the spoiler A and the muffler cutter 1 are brought close to each other. For example, as shown in FIG. 4, the spoiler A is lowered to the vicinity of the muffler cutter 1 so as to be close to the ground, or the muffler cutter 1 is surrounded as shown in FIG. 5. There are various types, such as the type in which the muffler cutter 1 is disposed above the normal position and protrudes from the spoiler A as shown in FIG. Recently, automobile manufacturers have proposed the same type as the so-called retrofit type described above.

  In addition, there are many users who prefer the muffler cutter 1 having a large diameter, and the distance from the spoiler A can be approached even if the muffler cutter 1 has a large diameter.

  However, since the muffler cutter 1 proposed in the past has a structure in which the surface becomes very hot when the engine is operated, the spoiler A approaching the muffler cutter 1 often burns or melts (spoiler). A is generally made of a thermoplastic resin such as urethane resin which is weak against heat for the purpose of weight reduction, recyclability, and cost reduction.) Also, the surface of the muffler cutter 1 is in a high temperature state. In addition to the influence on the spoiler A, there are various problems such as a risk of being burned by touching the muffler cutter 1 in a high temperature state. Conventionally, there were few scenes in which the hand was brought close to the muffler cutter 1, but since the popularity of the spoiler A as described above increased, the number of cases in which a hand was brought close to the muffler cutter 1 in a high temperature state increased. Yes.

  The present invention provides an innovative muffler cutter and an accessory provided on the muffler cutter, which solve the above-mentioned problems and have a very high commercial value.

  The gist of the present invention will be described with reference to the accompanying drawings.

  A muffler cutter of a muffler device for a vehicle, wherein the muffler cutter is composed of an outer cylindrical body 2 and an inner cylindrical body 3, and a vacuum layer 6 created by vacuum processing is provided between the two. It is related.

  The muffler cutter according to claim 1, wherein the connecting portion 4 between the outer cylindrical body 2 and the inner cylindrical body 3 is composed of a member having low thermal conductivity.

  Further, in the muffler cutter according to any one of claims 1 and 2, the muffler characterized in that an annular recess 4a is provided in the continuous portion 4 between the outer cylindrical body 2 and the inner cylindrical body 3. It concerns the cutter.

  Further, in the muffler cutter according to any one of claims 1 to 3, the thickness of the continuous portion 4 between the end portions of the outer cylindrical body 2 and the inner cylindrical body 3 is set to the outer cylindrical body 2 or the inner cylindrical body 3. The present invention relates to a muffler cutter characterized in that the thickness is set to be thinner than the thickness of the muffler.

  Further, in the muffler cutter according to any one of claims 1 to 4, the inclusion 5 having a low thermal conductivity is disposed in the space S formed by the outer cylindrical body 2 and the inner cylindrical body 3. The present invention relates to a muffler cutter.

  The muffler cutter according to any one of claims 1 to 5, wherein at least the inner cylindrical body 3 is formed of a metal having a low thermal conductivity and thermal expansion coefficient, such as titanium, kovar, or nickel. It concerns the cutter.

  Moreover, it is an accessory provided in the muffler cutter of the muffler device for a vehicle, and is composed of the outer cylinder body 2 and the inner cylinder body 3, and a vacuum layer 6 created by vacuum processing is provided between the two, and the muffler The present invention relates to an accessory provided in the muffler cutter, which is set in a configuration that can be fitted onto the cutter 1.

  Further, in the accessory provided in the muffler cutter according to claim 7, the end portions of the outer cylindrical body 2 and the inner cylindrical body 3 are constituted by members having low thermal conductivity. It relates to accessories provided in the muffler cutter.

  Further, in the accessory provided in the muffler cutter according to any one of claims 7 and 8, an annular recess 4a is provided in the connecting portion 4 between the end portions of the outer cylindrical body 2 and the inner cylindrical body 3. The present invention relates to an accessory provided in a muffler cutter.

  Moreover, the accessory provided in the muffler cutter of any one of Claims 7-9 WHEREIN: The thickness of the continuous connection part 4 of the end parts of the said outer cylinder 2 and the inner cylinder 3 is made into the outer cylinder 2 Or it concerns the accessory provided in the muffler cutter characterized by having set it as thickness thinner than the inner cylinder 3. FIG.

  Moreover, the accessory attached to the muffler cutter of any one of Claims 7-10 WHEREIN: The inclusion 5 with low heat conductivity is provided in the space S formed by the outer cylinder body 2 and the inner cylinder body 3. The present invention relates to an accessory attached to a muffler cutter characterized by being disposed.

  Further, in the accessory provided in the muffler cutter according to any one of claims 7 to 11, at least the inner cylindrical body 3 is formed of a metal having low thermal conductivity and thermal expansion coefficient such as titanium, kovar, or nickel. It is related to the accessory provided in the muffler cutter characterized by this.

  Since the present invention is configured as described above, the surface does not reach a high temperature state compared to a conventionally proposed muffler cutter, for example, an approached spoiler does not burn or melt, and touches and burns. This is an innovative muffler cutter with extremely high commercial value, such as the possibility of preventing the danger of damaging as much as possible, and accessories provided for the muffler cutter.

  An embodiment of the present invention which is considered to be suitable will be briefly described with reference to the drawings showing the operation of the present invention.

  In the present invention, since the muffler cutter 1 has a vacuum double structure including the outer cylinder body 2 and the inner cylinder body 3, it is possible to suppress the surface of the muffler cutter 1 from becoming high temperature.

  Therefore, for example, as shown in FIGS. 4 to 6, it is possible to prevent the spoiler A approached to the muffler cutter 1 from being burned or melted as much as possible, and there is a risk of being burned by touching the muffler cutter 1. Can also be prevented.

  A specific embodiment 1 of the present invention will be described with reference to FIGS.

  This embodiment is a muffler cutter 1 of a vehicle muffler device M as shown in FIG. 1 and an accessory (accessory pipe 1A) that is attached to an existing muffler cutter 1 as shown in FIG. .

  Specifically, the muffler cutter 1 and the accessory pipe 1 </ b> A have a vacuum double structure including the outer cylinder body 2 and the inner cylinder body 3.

  As shown in FIG. 7, the outer cylinder 2 and the inner cylinder 3 are formed by forming appropriate metal (stainless steel) members into a cylindrical shape (a rectangular tube shape or an elliptical tube shape may be used). .

  As a material constituting the outer cylinder 2 and the inner cylinder 3, in addition to stainless steel, for example, titanium, kovar, nickel, nickel alloy having a lower thermal conductivity and thermal expansion coefficient than stainless steel (the nickel content is 36%). Sometimes it is confirmed that the coefficient of thermal expansion is the lowest.) In addition, the outer cylinder 2 and the inner cylinder 3 may be made of different metals according to conditions (for welding of different metals). (Laser welding and electron beam welding described later are effective.)

  In particular, the inner cylinder 3 is made of titanium, kovar, nickel, or nickel alloy having low thermal conductivity and low thermal expansion coefficient, so that the outer surfaces of the muffler cutter 1 and the accessory pipe 1A can be heated at a high temperature because of low thermal conductivity. It can be prevented as much as possible, and since the coefficient of thermal expansion is low, deformation such as warping which is a concern due to high temperature of the metal is prevented as much as possible.

  In addition, as a material of the muffler cutter 1 and the accessory pipe 1A according to the present embodiment, materials other than those described above can be appropriately employed as long as they exhibit the characteristics of the present embodiment.

  The left and right ends of the outer cylinder 2 are curved inward, while the inner cylinder 3 has its left and right ends curved outward. The end portions of the inner cylinder 3 can be polymerized and are configured as parts to be joined by welding.

  Therefore, a space S is formed between the outer cylindrical body 2 and the inner cylindrical body 3 by polymerizing the end portions of the outer cylindrical body 2 and the inner cylindrical body 3.

  In addition, as illustrated in FIGS. 12 and 13, only one end of the outer cylinder 2 or the inner cylinder 3 may be bent.

  In the present embodiment, argon welding (argon arc welding), seam welding, laser welding, or electron beam welding is employed as welding for joining the ends of the outer cylinder 2 and the inner cylinder 3 together. Laser welding and electron beam welding are effective for welding dissimilar metals.

  Argon welding is welding performed by heating with an arc generated between a bare metal rod and an object to be welded in an argon gas atmosphere.

  In the seam welding, as shown in FIG. 11, the parts to be welded are overlapped and sandwiched between a pair of voltage rollers 13a and 13b serving as electrodes, and sequentially welded by the rotation of the voltage rollers 13a and 13b. Is the method.

  Laser welding is a welding performed by irradiating the welded part with a high-efficiency continuous wave laser. Electron beam welding applies a high-speed electron beam generated in a vacuum to the part to be welded and uses its impact heat generation. Welding.

  Further, as shown in FIG. 8, the inner cylindrical body 3 is formed with a concave portion 10 having a circular shape in plan view on the inner surface, and a through hole 10 a is formed at the center of the bottom surface of the concave portion 10.

  The through hole 10a functions as an air vent when performing vacuum heat treatment.

  Specifically, a brazing material 11 is arranged around the through-hole 10a on the bottom surface of the concave portion 10, and a sealing plate 12 fitted to the concave portion 10 is placed on the brazing material 11, and vacuum heat treatment is performed. When this is done, the sealing plate 12 seals the through-hole 10a as air in the space S escapes from the through holes 10a, between the recesses 10 and the sealing plate 12 and between the brazing materials 11, and the brazing material 11 melts. In the stopped state, it is fixed to the recess 10.

  Moreover, you may arrange | position the inclusion 5 with low heat conductivity in the space formed with the outer cylinder 2 and the inner cylinder 3 as shown in FIG.

  This inclusion 5 is formed by forming a ceramic plate.

  In this example, “Iso wool (trademark) 1260 blanket or 1260 ace paper, 1500 ace paper” manufactured by Isolite Industry Co., Ltd. is used as the ceramic, which has heat resistance up to 1260 ° C. It can withstand high temperatures in the vacuum furnace used in the examples (can be in a high temperature state up to about 1100 ° C.), has excellent heat insulation properties, and is lightweight and flexible because of ceramic fibers. Easy to handle (“Isowool ™ 1260 Blanket or 1260 Ace Paper, 1500 Ace Paper” is also used for the heat insulation structure of the wall that constitutes the vacuum heating furnace. I have it.)

  In addition, the thickness of the inclusion 5 corresponds to the inner surfaces of the outer cylinder 2 and the inner cylinder 3 when the inclusion 5 is disposed in the space S between the outer cylinder 2 and the inner cylinder 3. The thickness is set to be in contact with or close to each other.

  Therefore, by disposing the inclusion 5 in the space S between the outer cylinder 2 and the inner cylinder 3, the outer cylinder 2 that can be generated by atmospheric pressure when the space S is in a vacuum state, The contact with the inner cylinder 3 can be prevented as much as possible, and the inclusion 5 is a material having a heat insulating property, so that a better heat insulating structure is obtained.

  In addition, the present applicant is able to keep the thermal conductivity extremely low by placing the ceramic inclusions 5 in a vacuum environment and shrinking the inclusions 5 so as to be adjusted to an appropriate bulk specific gravity (bulk density). (See Fig. 10). Therefore, it can be said that it is very effective to select ceramic as the inclusion 5 according to the present embodiment, which requires low thermal conductivity.

  Since the present embodiment is configured as described above, since the muffler cutter 1 and the accessory pipe 1A have a vacuum double structure including the outer cylinder body 2 and the inner cylinder body 3, the surfaces of the muffler cutter 1 and the accessory pipe 1A are It can suppress becoming high temperature.

  Therefore, according to the present embodiment, for example, the spoiler A brought close to the muffler cutter 1 and the accessory pipe 1A can be prevented from being burned or melted as much as possible, and the muffler cutter 1 and the accessory pipe 1A can be prevented. Occurrence of the risk of burns when touched.

  Moreover, since the present Example has arrange | positioned the inclusion 5 with low heat conductivity in the space S formed with the outer cylinder body 2 and the inner cylinder body 3, a much more favorable heat insulation structure will be obtained. .

  In the present embodiment, at least the inner cylinder 3 is formed of a metal member having a low thermal expansion coefficient and thermal conductivity such as titanium, kovar, nickel, nickel alloy, etc., and thus the thermal conductivity of the inner cylinder 3 is low. Heat transfer to the outer cylindrical body 2 can be suppressed, and deformation such as warpage caused by heating the metal can be prevented because the coefficient of thermal expansion is low.

  A second embodiment of the present invention will be described with reference to FIG.

  In the present embodiment, as shown in FIG. 14, as a means for connecting the outer cylinder 2 and the inner cylinder 3, an annular solder disposed between the ends of the outer cylinder 2 and the inner cylinder 3. This is a case where continuous means for melting and solidifying the material 14 is employed.

  By adopting this continuous means, since the vacuum heating treatment of the space S between the outer cylinder 2 and the inner cylinder 3 can be performed, and the outer cylinder 2 and the inner cylinder 3 can be joined, This is an extremely efficient manufacturing method.

  The rest is the same as in Example 1.

  A specific third embodiment of the present invention will be described with reference to FIGS.

  In this embodiment, as shown in FIGS. 15 and 16, the connecting means between the outer cylinder 2 and the inner cylinder 3 is formed between the end portions of the outer cylinder 2 and the inner cylinder 3. This is a case where a continuous means for closing the opening with the continuous member 4 (ring plate) is employed.

  In the case of the present embodiment, the connecting member 4 is formed by forming an appropriate metal plate member in an annular shape (doughnut plate shape) when viewed from the front, and joining with the outer cylinder 2 and the inner cylinder 3. Joining is performed by welding using the above-described welding or brazing material.

  By forming the connecting member 4 with titanium, kovar, nickel, or nickel alloy having a low thermal conductivity and low thermal expansion coefficient as described above, heat transfer from the inner cylinder 3 to the outer cylinder 2 is further suppressed. Can do.

  Further, in this embodiment, the thickness of the connecting member 4 is set to be thinner than the thickness of the outer cylinder body 2 and the inner cylinder body 3. Note that the thickness may be smaller than the thickness of either the outer cylinder 2 or the inner cylinder 3.

  This is a configuration for suppressing heat transfer from the inner cylinder 3 to the outer cylinder 2 by reducing the cross-sectional area of a portion where the outer cylinder 2 and the inner cylinder 3 are continuously provided, and a connecting member Since 4 is not required to be as strong as the outer cylinder 2 and the inner cylinder 3, the problem of breakage does not occur.

  The connecting member 4 is provided with an annular recess as shown in FIGS. 17, 18 and 19, that is, it has a cross-sectional mountain shape or a cross-sectional wave shape, and is provided with stretchability (elasticity). May be.

  This is because heat transfer from the inner cylinder 3 to the outer cylinder 2 is suppressed by forming an annular recess in the connecting member 4 (by forming a cross-sectional mountain shape or a cross-sectional wave shape). In addition, by providing elasticity, if the metallic inner cylinder 3 is heated and expanded, the metal inner cylinder 3 expands and contracts according to the expansion and deforms such as warping of the muffler cutter 1 and the accessory pipe 1A. Can be prevented.

  The rest is the same as in Example 1.

  The present invention is not limited to the first, second, and third embodiments, and the specific configuration of each component can be designed as appropriate.

It is a perspective view explaining the muffler device M for vehicles. It is a perspective view explaining the accessory provided in the muffler cutter. It is explanatory drawing which shows the relationship between the muffler cutter 1 and the spoiler A. FIG. It is explanatory drawing which shows the relationship between the muffler cutter 1 and the spoiler A. FIG. It is explanatory drawing which shows the relationship between the muffler cutter 1 and the spoiler A. FIG. It is explanatory drawing which shows the relationship between the muffler cutter 1 and the spoiler A. FIG. 3 is an explanatory cross-sectional view of a main part according to Embodiment 1. FIG. 3 is an explanatory cross-sectional view of a main part according to Embodiment 1. FIG. 3 is an explanatory cross-sectional view of a main part according to Embodiment 1. FIG. It is a graph which shows the relationship between thermal conductivity and bulk specific gravity. 6 is an explanatory cross-sectional view illustrating the manufacturing method of Example 1. FIG. 3 is an explanatory cross-sectional view of a main part according to Embodiment 1. FIG. 3 is an explanatory cross-sectional view of a main part according to Embodiment 1. FIG. FIG. 6 is an explanatory cross-sectional view of a main part according to a second embodiment. FIG. 6 is an explanatory cross-sectional view of a main part according to a third embodiment. FIG. 6 is an explanatory cross-sectional view of a main part according to a third embodiment. FIG. 6 is an explanatory cross-sectional view of a main part according to a third embodiment. FIG. 6 is an explanatory cross-sectional view of a main part according to a third embodiment. FIG. 6 is an explanatory cross-sectional view of a main part according to a third embodiment.

Explanation of symbols

S space 1 muffler cutter 2 outer cylinder 3 inner cylinder 4 continuous portion 4a annular recess 5 inclusion 6 vacuum layer

Claims (12)

  A muffler cutter for a vehicle muffler device, comprising an outer cylinder and an inner cylinder, and a vacuum layer created by vacuum treatment is provided between both.   The muffler cutter according to claim 1, wherein the outer cylinder and the inner cylinder are connected to each other by a member having a low thermal conductivity.   The muffler cutter according to any one of claims 1 and 2, wherein an annular recess is provided in a continuous portion between the outer cylindrical body and the inner cylindrical body.   The muffler cutter according to any one of claims 1 to 3, wherein a thickness of the continuous portion of the outer cylindrical body and the inner cylindrical body is smaller than a thickness of the outer cylindrical body or the inner cylindrical body. A muffler cutter characterized by being set to.   The muffler cutter according to any one of claims 1 to 4, wherein an inclusion having low thermal conductivity is disposed in a space formed by the outer cylinder and the inner cylinder. .   The muffler cutter according to any one of claims 1 to 5, wherein at least the inner cylinder is formed of a metal having a low thermal conductivity and thermal expansion coefficient such as titanium, Kovar, or nickel.   An accessory provided in the muffler cutter of a vehicle muffler device, which is composed of an outer cylinder body and an inner cylinder body, and a vacuum layer created by vacuum treatment is provided between the two and can be fitted to the muffler cutter. An accessory provided on the muffler cutter, characterized in that it is set to a specific configuration.   The accessory provided in the muffler cutter according to claim 7, wherein the outer cylinder and the inner cylinder are connected to each other by a member having low thermal conductivity. accessories.   The accessory provided in the muffler cutter according to any one of claims 7 and 8, characterized in that an annular recess is provided in a continuous portion between the end portions of the outer cylinder and the inner cylinder. Accessories provided on the muffler cutter.   The accessory provided in the muffler cutter of any one of Claims 7-9 WHEREIN: The thickness of the continuous connection part of the end part of the said outer cylinder body and an inner cylinder body is set rather than an outer cylinder body or an inner cylinder body. An accessory provided on the muffler cutter, which is characterized by its thin thickness.   The accessory attached to the muffler cutter according to any one of claims 7 to 10, wherein an inclusion having a low thermal conductivity is disposed in a space formed by the outer cylinder and the inner cylinder. Accessories attached to the characteristic muffler cutter. The accessory provided in the muffler cutter according to any one of claims 7 to 11, wherein at least the inner cylindrical body is formed of a metal having low thermal conductivity and thermal expansion coefficient such as titanium, kovar, or nickel. Accessories provided on the muffler cutter.

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