JPH10246111A - Connecting structure for vehicle exhaust pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connecting structure for vehicle exhaust pips capable of connecting one-end sections of plural vehicle exhaust pipes consisted of double tubes at a prescribed position precisely. SOLUTION: One-end sections of plural vehicle exhaust tubes 1, 7, 8 are assembled. Bulge sections 6, 15, 16 having a V-shaped cross section and an apex angle of 120 deg. are formed at one-end sections of the outer tubes 3, 11, 12 of the exhaust pipes 1, 7, 8. The roof shape sections 6b, 15a, 16a of the bulge sections 6, 15, 16 of the outer tubes 3, 11, 12 adjoining to each other are closely stuck. The corner sections 17, 18, 19 of the closely stuck roof shape sections 6b, 15a, 16a are welded to connect the exhaust pipes 1, 7, 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for connecting one end of an exhaust pipe for a vehicle, and more particularly to a structure using a double pipe for an exhaust pipe for a vehicle.

[0002]

2. Description of the Prior Art As shown in FIGS. 5 and 6, one end portions 34, 35, 3 of vehicle exhaust pipes 31, 32, 33 each formed of a double pipe.
As a connecting structure of the exhaust pipe for a vehicle, in which the sealing members 38 are assembled and joined together, a sealing member 38 is fitted into a gap 37 formed by gathering one end portions 34, 35, 36, and the sealing member 38 is connected to the one end portion 34, Structures welded to 35 and 36 are known.

[0003]

However, the above-mentioned conventional exhaust pipe coupling structure for a vehicle uses a sealing member 38 formed separately from the exhaust pipes 31, 32, 33, so that the exhaust pipe for a vehicle is used. However, there is a problem that the weight increases. Therefore,
The present invention has been made in order to solve the above problems, and has as its object to provide a vehicle exhaust pipe coupling structure that does not increase the weight of the vehicle exhaust pipe.

[0004]

SUMMARY OF THE INVENTION The present invention relates to a vehicle exhaust pipe connecting structure in which one end portions of a plurality of double-tube exhaust pipes are assembled and connected, and an outer pipe of the vehicle exhaust pipe is provided. Formed at one end portion of the vehicle have bulging portions extending in the axial direction of the vehicle exhaust pipe and having a V-shaped cross section having a vertical angle of 360 / n degrees (n is the number of exhaust pipes). The roof mold portion of the bulging portion of the adjacent outer pipe is brought into close contact with each other, and a corner of the roof mold portion is welded.

One end of each of the plurality of outer tubes is accurately connected to a predetermined position by bringing the roof mold portions of the bulging portions of the adjacent outer tubes into close contact with each other and welding the corner portions of the roof mold portions which are in close contact with each other. it can.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The welding may be applied to only one corner of the roof mold part of the bulging part which is in close contact with each other, or may be applied to both corners of the roof mold part.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 and 2 show a structure of a vehicle exhaust pipe 1 composed of a double pipe used in the present embodiment. The vehicle exhaust pipe 1 is a double pipe composed of an inner pipe 2 and an outer pipe 3, and a tip 4 of the outer pipe 3.
The outer pipe 3 has a bulging portion 6 extending in the axial direction of the vehicle exhaust pipe 1 at one end 5 of the outer pipe 3. The swelling portion 6 includes an upstream swelling portion 6a swelling from one end 5 toward an exhaust inflow side (upper side in FIG. 1) toward an exhaust outflow side (lower side in FIG. 1), and an upstream swelling portion 6a. 1, a roof-shaped roof part 6b having a V-shaped cross section and an apex angle A of 120 degrees, and an exhaust-outflow side of the roof part 6b. (Lower side in FIG. 1) and a downstream bulging portion 6 c narrowing toward the distal end 4 of the outer tube 3.

FIGS. 3 and 4 show a connecting structure of the exhaust pipes 1, 7, 8 for a vehicle. The vehicle exhaust pipe 1, the vehicle exhaust pipe 7, and the vehicle exhaust pipe 8 are assembled at one end portions 5, 9, and 10, respectively. The vehicle exhaust pipes 7 and 8 have the same structure as the vehicle exhaust pipe 1, and include outer pipes 11 and 12 and inner pipes 13 and 14. Is formed. The roof mold parts 6b, 15a, 16a of the bulging parts 6, 15, 16 adjacent to each other of the vehicle exhaust pipes 1, 7, 8 are in close contact with each other, and the roof mold parts 6b, 15a, 16 in close contact with each other.
The corners 17, 18, 19 of a are welded.

When the one end portions 5, 9, 10 of the three vehicle exhaust pipes 1, 7, 8 are assembled, the roof mold portions 6b, 15a, 16a of the outer pipes 3, 11, 12 are brought into close contact with each other and the roof molds are formed. Since the corners 17, 18, and 19 of the portions 6b, 15a, and 16a were welded, one end portions 5, 9, of the three outer tubes 3, 11, and 12 were welded.
10 can be accurately coupled to a predetermined position. Further, the three outer tubes 3, 11, and 12 are combined into a single exhaust pipe (not shown).
And the vehicle exhaust pipes 1, 7, 8
When is heated and cooled, the inner tubes 2, 13 and 14 expand and contract in the axial direction, but one end portions 5, 9 and 3 of the three outer tubes 3, 11 and 12.
Exhaust gas does not leak from the fitting and fixing portion between the exhaust pipe 10 and a single exhaust pipe (not shown), and the inner pipes 2, 13, and 14 do not have bulging portions. , 13, and 14, there is no change in the cross-sectional area, and the flow of the exhaust gas is good.

[0010]

According to the present invention, in a vehicle exhaust pipe connecting structure in which one end portions of a plurality of double exhaust pipes for a vehicle are assembled and combined, the outer pipe of the vehicle exhaust pipe is At one end, bulges are formed which extend in the axial direction of the vehicle exhaust pipe and have a V-shaped cross section with a vertical angle of 360 / n degrees (n is the number of exhaust pipes) and are adjacent to each other. Since the roof mold portion of the bulging portion of the outer pipe is closely contacted and the corner of the roof mold portion is welded, a plurality of vehicle exhaust pipes formed of a double pipe can be accurately and easily connected, and The number of parts does not increase, and the fitting and fixing with another single exhaust pipe are extremely easy.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a vehicle exhaust pipe used in the vehicle exhaust pipe coupling structure of the present invention.

FIG. 2 is a cross-sectional view of the vehicle exhaust pipe of FIG. 1 taken along the line II-II.

FIG. 3 is a view showing a state in which the vehicle exhaust pipes are assembled.

FIG. 4 is a sectional view taken along line IV-IV of the assembled exhaust pipe shown in FIG. 3;

FIG. 5 is a cross-sectional view of a vehicle exhaust pipe used in a conventional vehicle exhaust pipe coupling structure.

FIG. 6 is a sectional view taken along line VI-VI of the vehicle exhaust pipe of FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Exhaust pipe for vehicles 3 Outer pipe 5 One end part 6 Swelling part 8 Exhaust pipe for vehicles 9 Exhaust pipe for vehicle 11 One end part 10 One end part 14 Outer pipe 15 Outer pipe 18 Swelled part 19 Swelled part

Claims (1)

[Claims] 1. A vehicle exhaust pipe connecting structure in which one end portions of a plurality of vehicle exhaust pipes formed of a double pipe are assembled and connected to each other. Bulges having a V-shaped cross section extending in the axial direction of the exhaust pipe and having a vertical angle of 360 / n degrees (n is the number of exhaust pipes), and the bulges of the outer pipes adjacent to each other are formed. A joint structure for an exhaust pipe for a vehicle, wherein a roof mold portion of an outlet portion is brought into close contact and a corner of the roof mold portion is welded.