Exhaust device

Abstract

To provide an exhaust device capable of inexpensively suppressing vibration of a rear end of a tail pipe.SOLUTION: A tail end member 7 is fitted to a downstream end part of a tail pipe 6. A mounting part 13a of a support part 13 is mounted to the tail end member 7. An elastic member is interposed to enable the support part 13 to be mounted to a vehicle. Thickness of a portion of the tail end member 7 to which the mounting part 13a is mounted and / or thickness of a portion of the support part 13 mounted to the tail end member 7 is made thicker than that of a portion of the tail pipe 6 to which the mounting part 13a is mounted.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to an exhaust system. [Background technology]

[0002] Conventionally, in order to reduce vibration at the rear end of the tail pipe in an exhaust pipe mounted on a vehicle such as an automobile, a muffler cutter having a mass damper function has been provided at the rear end of the tail pipe of the exhaust pipe (see Patent Document 1).

[0003] Furthermore, in order to reduce vibration at the rear end of the tailpipe in an exhaust pipe mounted on a vehicle such as an automobile, a muffler cutter with a weight attached inside is provided at the rear end of the tailpipe of the exhaust pipe (see Patent Document 2). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2003-172138 [Patent Document 2] Japanese Patent Application Laid-Open No. 2003-20941 Summary of the Invention [Problem to be solved by the invention]

[0005] The method described in Patent Document 1 requires the provision of a muffler cutter and a mass damper, which results in an expensive exhaust device.

[0006] The method described in Patent Document 2 above has the problem that the position where the tailpipe is supported is far from the rear end of the tailpipe, which increases vibrations except at specific frequencies where vibrations can be reduced by resonance.

[0007] Therefore, the present invention provides an exhaust device that can suppress vibrations at the rear end of a tailpipe at low cost. The purpose of this is to [Means for solving the problem]

[0008] In order to solve the above-mentioned problems, the present invention provides a tail end member fitted to a downstream end portion of a tail pipe, a mounting portion of a support portion attached to the tail end member, and a support portion attached to a vehicle via an elastic member, The plate thickness of the portion of the tail end member where the mounting portion is attached, and / or the plate thickness of the portion of the mounting portion where it is attached to the tail end member, is thicker than the plate thickness of the portion of the tail pipe where the mounting portion is attached.

[0009] The exhaust system further comprises a center pipe having a fastening flange at an end thereof on the engine side, a main muffler interposed in the center pipe, and a sub-muffler provided downstream of the center pipe, and the tail pipe is provided downstream of the sub-muffler, The upstream end of the center pipe may be attached to the vehicle by a first support portion, the downstream end of the main muffler by a second support portion, and the tail end member by a third support portion. [Effects of the Invention]

[0010] In the present invention, by making the plate thickness of the portion where the support portion of the tail end member is provided and / or the plate thickness of the support portion of the tail end member in the mounting member thicker than the plate thickness of the tail pipe, it is possible to give the portion where the mounting portion of the support portion of the tail end member is attached a mass damper function, thereby suppressing vibration of the tail end member and enabling the exhaust device to be formed at low cost. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a side view of an exhaust device according to a first embodiment of the present invention. [Figure 2] FIG. 2 is an enlarged longitudinal sectional view of a main part of FIG. 1. [Figure 3] Cross section of Figure 2. DETAILED DESCRIPTION OF THE INVENTION

[0012] An embodiment of an exhaust system according to the present invention will be described with reference to the accompanying drawings.

[0013] FIG. 1 is a side view of an exhaust device 1 according to an embodiment of the present invention, and FIG. 2 is an enlarged view of a main part thereof.

[0014] As shown in FIGS. 1 and 2, the exhaust device 1 constitutes a part of an exhaust pipe through which exhaust gas emitted from the engine of a vehicle such as an automobile flows.

[0015] The exhaust device 1 is adapted to be connected at its upstream side to an engine (not shown).

[0016] As shown in FIG. 1, the exhaust system 1 has a first center pipe 2 and a second center pipe 4. A fastening flange 2a is provided at the upstream end of the first center pipe 2, and the downstream end of a front pipe 10 is connected to the fastening flange 2a.

[0017] As shown in Fig. 1, a main muffler 3 is provided downstream of the first center pipe 2, and a second center pipe 4 is provided downstream of the main muffler 3. In other words, the main muffler 3 is interposed between the center pipes 2 and 4. A sub-muffler 5 is provided downstream of the second center pipe 4, and a tail pipe 6 is provided downstream of the sub-muffler 5, with a tail end member 7 provided at the downstream end of the tail pipe 6.

[0018] The downstream side of the fastening flange 2a, i.e., the upstream end of the first center pipe 2, is attached to the vehicle by the first support part 11, the downstream end of the main muffler 3, i.e., the upstream end of the center pipe 4, is attached to the vehicle by the second support part 12, and the upstream part of the tail end member 7 is attached to the vehicle by the third support part 13.

[0019] Each of the support portions 11, 12, and 13 is attached to the vehicle via an elastic member (not shown).

[0020] The upstream end of the tail end member 7 is fitted radially outside the downstream end of the tail pipe 6. The mounting portion 13a of the third support portion 13 is attached by a fixing means such as welding to the outside of a fitting portion 20 where the tail pipe 6 and the tail end member 7 overlap. In this embodiment, the axial length of the tail end member 7 at the mounting portion 13a of the third support portion 13 is shorter than the axial length of the tail end member 7 at the fitting portion 20, but it may be the same as or longer than that axial length.

[0021] In the tail end member 7, the plate thickness of at least the portion where the mounting portion 13a of the third support portion 13 is attached and / or the plate thickness of at least the portion where the mounting portion 13a of the third support portion 13 is attached to the tail end member 7 is made thicker than the plate thickness of at least the portion where the mounting portion 13a of the third support portion 13 is attached to the tail pipe 6. In this embodiment, the plate thickness of the fitting portion 20 of the tail end member 7 and the plate thickness of the mounting portion 13a of the third support portion 13 are made thicker than the plate thickness of the fitting portion 20 of the tail pipe 6.

[0022] Only the thickness of the portion of the fitting portion 20 of the tail end member 7 where the mounting portion 13a of the third support portion 13 is attached may be made thicker than the thickness of the fitting portion 20 of the tail pipe 6, or the entire fitting portion 20 of the tail end member 7 may be made thicker than the thickness of the fitting portion 20 of the tail pipe 6, or the entire axial thickness of the tail end member 7 may be made thicker than the thickness of the fitting portion 20 of the tail pipe 6.

[0023] Only the partial thickness of the fitting portion 20 of the tail pipe 6 where the mounting portion 13a of the third support portion 13 is attached may be formed thinner than the thickness of the fitting portion 20 of the tail end member 7, or the entire thickness of the fitting portion 20 of the tail pipe 6 may be formed thinner than the thickness of the fitting portion 20 of the tail end member 7, or the entire axial thickness of the tail pipe 6 may be formed thinner than the thickness of the fitting portion 20 of the tail end member 7.

[0024] The axial length of the fitting portion 20 between the tail pipe 6 and the tail end member 7 can be set arbitrarily, but is preferably 5 mm or more.

[0025] Before the present invention, when the tail end member 7 was attached to the vehicle by the third support portion 13 via an elastic member, vibration remained.

[0026] In contrast, in the present invention, the plate thickness of the mounting portion 13a of the third support portion 13 at the fitting portion 20 of the tail end member 7 and / or the plate thickness of the mounting portion 13a of the third support portion 13 are made thicker than the plate thickness of the mounting portion 13a of the third support portion 13 at the fitting portion 20 of the tail pipe 6, thereby giving the fitting portion 20 a mass damper function and making it possible to suppress vibration of the tail end member 7.

[0027] The exhaust device 1 can suppress vibration of the tail end member 7 without using a muffler cutter, a mass damper, or a dynamic damper, and the exhaust device 1 can be formed inexpensively.

[0028] By combining the tail end member 7, the third support portion 13, the fitting portion 20, etc., it is possible to suppress vibration of the tail end member 7, which increases the design freedom of the exhaust device 1 and enables an optimal structure to be achieved that suppresses vibration of the tail end member 7 at low cost. [Explanation of symbols]

[0029] 1 Exhaust system 2 Front pipe 2a Fastening flange 3 Main muffler 4 Center pipe 5 Sub-muffler 6 Tailpipe 7 Tail end member 11 First support part 12 Second support part 13 Third support part 13a Mounting part

Claims

1. a tail end member is fitted to the downstream end of the tail pipe, and the mounting portion of the support portion is attached to the tail end member, and the support portion is attached to the vehicle via an elastic member; An exhaust device characterized in that the plate thickness of the portion of the tail end member where the mounting portion is attached, and / or the plate thickness of the portion of the mounting portion where it is attached to the tail end member, is thicker than the plate thickness of the portion of the tail pipe where the mounting portion is attached.

2. the exhaust system includes a center pipe having a fastening flange at an end thereof on the engine side, a main muffler interposed in the center pipe, and a sub-muffler provided downstream of the center pipe, and the tail pipe is provided downstream of the sub-muffler; 2. The exhaust system according to claim 1, wherein the upstream end of the center pipe is attached to the vehicle by a first support portion, the downstream end of the main muffler is attached to the vehicle by a second support portion, and the tail end member is attached to the vehicle by a third support portion.

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