JPH0577536U - Finisher - Google Patents

Abstract

(57) [Summary] [Object] The present invention relates to improvement of a finisher of an exhaust system of an automobile, and makes it difficult for the exhaust gas that spreads as a turbulent flow from the tail tube into the finisher outer cylinder to hit the curl portion of the finisher outer cylinder. , The purpose is to reduce the generation of abnormal noise. [Structure] A finisher outer cylinder 3 in which a curl portion 4 wound inward is formed at a rear end 3A, a support member 2 fixed in the finisher outer cylinder 3, and the support member 2,
In a finisher having a tail tube 1 attached by arranging a terminal end 1A at a predetermined distance from a rear end 3A of the finisher outer cylinder 3, a tail tube 1 is attached to a rear end portion 1B of the tail tube 1. A tapered portion 5 was formed that widens toward the rear along the axial direction.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to improvement of a finisher for an exhaust system of a vehicle.

[0002]

[Prior Art]

 Generally, a finisher shown in Japanese Utility Model Laid-Open No. 62-176430 is provided at the end of a tail tube of an exhaust system of an automobile.

As this type of finisher, for example, one shown in FIG. 4 is known. In the figure, reference numeral 21 is a tail tube in an exhaust system, and a finisher outer cylinder 23 is supported at a rear end portion of the tail tube 21 via a support member 22.

That is, the support member 22 is fixed in the finisher outer cylinder 23 at a predetermined distance from the rear end 23 A of the finisher outer cylinder 23. The support member 22 is formed with a mounting hole 22A at the center, the tail tube 21 is inserted into the mounting hole 22A of the support member 22, and the end 21A of the tail tube 21 has a rear end 23A of the finisher outer cylinder 23. Is located in the finisher outer cylinder 23 at a predetermined distance from.

A curl portion 24 wound inward is formed at the rear end 23A of the finisher outer cylinder 23. On the other hand, the front end side of the finisher outer cylinder 23 is supported by the tail tube 21 via a bracket 26. The tightening bolt 27 penetrates through the front end side of the finisher outer cylinder 23, and the bracket 26 is fixed to the finisher outer cylinder 23 via the nut 28 by the tightening bolt 27.

[0006]

[Problems to be solved by the device]

 However, in the conventional finisher, the exhaust gas rapidly spreads from the end 21A of the tail tube 21 into the finisher outer cylinder 23 having a large cross-sectional area, and this turbulent flow spreads out. There was a problem that abnormal noise was generated when hitting the curl portion 24 of 23.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to curl exhaust gas, which has spread turbulently from a tail tube into the finisher outer cylinder, into a curl portion of the finisher outer cylinder. It is to provide a finisher that is hard to hit and reduces the generation of abnormal noise.

[0008]

[Means for Solving the Problems]

 According to the present invention, a finisher outer cylinder having an inwardly curled portion formed at a rear end thereof, a support member fixed in the finisher outer cylinder, and an end of the support member at the rear end of the finisher outer cylinder are provided. In a finisher having a tail tube mounted at a predetermined distance from the end, a taper portion is formed at a rear end portion of the tail tube, the taper portion expanding toward the rear along the axial direction of the tail tube. It is characterized by being made.

[0009]

[Action]

 In the present invention, the rear end of the tail tube is formed with a taper portion that extends along the axial direction of the tail tube, so that the flow velocity and pressure of the exhaust gas flowing therethrough are low in the rear end of the tail tube. Therefore, the generation of turbulent flow from the tail tube to the inside of the finisher outer cylinder is suppressed, and exhaust gas is less likely to hit the curled portion of the tail tube.

[0010]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. 1 and 2 show a finisher according to an embodiment of the present invention.

In the drawing, reference numeral 1 is a tail tube in an exhaust system, and a finisher outer cylinder 3 is supported by a rear end portion 1 B of the tail tube 1 via a support member 2.

That is, the support member 2 is fixed in the finisher outer cylinder 3 at a predetermined distance from the rear end 3A of the finisher outer cylinder 3. The support member 2 is formed of a disc-shaped plate material having a mounting hole 2A formed in the center, has an annular outer flange 2B at the outer peripheral edge that abuts the finisher outer cylinder 3, and an annular inner flange at the inner peripheral edge of the mounting hole 2A. It has 2C.

The tail tube 1 is inserted into the mounting hole 2A of the support member 2, and the end surface of the terminal end 1A of the tail tube 1 is abutted against the annular inner flange 2C of the support member 2 so that the tail tube 1 is attached to the support member 2. Is fixed. Therefore, the terminal end 1A of the tail tube 1 is located at a predetermined distance from the rear end 3A of the finisher outer cylinder 3.

At the rear end 3 A of the finisher outer cylinder 3, there is formed a curl portion 4 which is wound inward. A taper portion 5 is formed at the rear end portion 1B of the tail tube 1 so as to spread along the axial direction of the tail tube 1, and the rear portion continuous with the taper portion 5 is at the terminal end 1A of the tail tube 1 described above. Correspondingly, it is formed in a cylindrical shape.

On the other hand, the front end side of the finisher outer cylinder 3 is supported by the tail tube 1 via a bracket 6. In this bracket 6, a tightening bolt 7 penetrates the front end side of the finisher outer cylinder 3 and is fixed to the finisher outer cylinder 3 via a nut 8 by the tightening bolt 7.

In the present embodiment, however, since the rear end portion 1B of the tail tube 1 is formed with the taper portion 5 extending along the axial direction of the tail tube 1, the inside of the rear end portion 1B of the tail tube 1 is formed. Then, the flow velocity and pressure of the exhaust gas flowing therethrough become low, the spread of the exhaust gas from the rear end portion 1B of the tail tube 1 into the finisher outer cylinder 3 is reduced, and the generation of turbulence is suppressed, Exhaust gas is less likely to hit the curl portion 4 of the tail tube 1.

Further, since the tail end 1A, which is a rear side portion continuing from the taper portion 5 of the tail tube 1, is formed in a cylindrical shape, the direction of the exhaust gas flow is directly directed to the curl portion 4. Instead, it changes in the direction X parallel to the axial direction of the tail tube 1 and is hard to hit the curl portion 4.

According to the above-mentioned configuration, since the tapered portion 5 that spreads along the axial direction of the tail tube 1 is formed at the rear end portion 1B of the tail tube 1, the exhaust gas flowing in the tail tube 1 is The flow velocity and pressure are reduced, and turbulent flow from the tail tube 1 into the finisher outer cylinder 3 is less likely to occur. Therefore, the exhaust gas is less likely to hit the curl portion 4 of the tail tube 1, and the generation of abnormal noise due to turbulence can be reduced.

In the present embodiment, the tapered portion 5 is formed in the middle of the rear end portion 1B of the tail tube 1, and the rear end portion 1A of the tail tube 1 which is a rear side portion continuous with the tapered portion 5 is Although it is formed in a cylindrical shape, as shown in FIG. 3, the tapered portion 11 may be formed at the final end of the rear end portion 1B of the tail tube 1. In this case, the dotted line Y, which is an extension of the inclined line of the taper portion 5, needs to be inside the curl portion 4.

[0020]

[Effect of the device]

 As described above, according to the present invention, the rear end of the tail tube is formed with the taper portion that extends along the axial direction of the tail tube. The turbulent flow from the tail tube to the inside of the finisher cylinder is less likely to occur. Therefore, the exhaust gas is less likely to hit the curl portion of the tail tube, and the effect of reducing the generation of abnormal noise due to turbulent flow is exerted.

[Brief description of drawings]

FIG. 1 is a sectional view of a finisher according to an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of a main part of the finisher.

FIG. 3 is an enlarged cross-sectional view of a main part showing a modified example of the finisher.

FIG. 4 is a sectional view of a conventional finisher.

[Explanation of symbols]

 1 Tail tube 1A Terminal 1B Rear end 2 Support member 3 Finisher outer cylinder 3A Rear end 4 Curl 5 Tapered

Claims (1)

[Scope of utility model registration request] 1. A finisher outer cylinder (3) having an inwardly curled portion (4) formed at a rear end (3A), and a support member (2) fixed in the finisher outer cylinder (3). ) And a tail tube (1) attached to the support member (2) by arranging the end (1A) at a predetermined distance from the rear end (3A) of the finisher outer cylinder (3). In the finisher, the rear end portion (1B) of the tail tube (1) is formed with a taper portion (5) that widens rearward along the axial direction of the tail tube (1). ..