JP2512797Y2 - Muffler tail pipe for automobile - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tail pipe for an automobile muffler.

[0002]

2. Description of the Related Art A muffler cutter that covers the outer periphery of an automobile muffler is attached to the tail pipe of the automobile.

Typical examples thereof are shown in FIGS. 2 to 4 (actual Kaihei 3).
-97533). A cylindrical retainer 2 is fixed to the inner peripheral surface of the muffler cutter 1, and the retainer 2 has a large-diameter semi-circular arc-shaped portion 3 in contact with the upper inner peripheral surface of the muffler cutter 1 at the central portion, and at both front and rear ends. A large 1 retainer 7 having a small-diameter semi-circular arc portion 5 in contact with the upper outer peripheral surface of the tail pipe 4 and a stopper piece 6 for regulating the position of the rear end of the tail pipe 4 at the rear end, and a lower portion of the muffler cutter 1. It is formed in an arc shape so as to contact the inner peripheral surface, and both ends of the arc are formed in the first retainer 7.
Of the muffler cutter 1 is fixed to both ends in the circumferential direction of the muffler cutter 1 and is formed with a second retainer 8 made of a material having a rigidity lower than that of the first retainer. A bolt 9 penetrating through is screwed, and the tip of the bolt 9 is configured to be crimped to the lower surface of the tail pipe 4.

10 is a muffler, 11 is a nut, 12 and 13
Is a spot weld.

[0005]

In the above-mentioned conventional technique, the tail pipe and the muffler cutter are composed of separate parts, and in addition, a large number of tightening parts such as retainers and bolts are required to connect them together, and A structure that can position the muffler cutter in the circumferential direction is required, which is also complicated.

Further, there have been problems that abnormal noise is generated from the tightening portion due to vibration of the muffler and the muffler cutter falls off. Then, this invention aims at solving these problems by integrating a tail pipe and a muffler cutter.

[0007]

In order to achieve the above-mentioned object, the tail pipe of the present invention has a tail pipe member end pad.
Ip material itself is extended and folded back to the outer diameter side, and the inner layer (13)
The outer layer portion (1) having a space portion (15) over the entire length between
2) is integrally formed.

[0008]

[0009]

Since the outer layer portion acts as a muffler cutter and is integrated with the tail pipe, the generation of noise due to loosening is eliminated, the number of parts is reduced, and the manufacturing cost is reduced.

[0010]

[0011]

EXAMPLE In the example of FIG. 1, 10 is a muffler, 11
Is a tail pipe in which the end of a metal (SUS) cylindrical pipe material is inverted to the outer diameter side and folded back to form the outer layer portion 12.

Reference numeral 13 is an inner layer portion, 14 is an inversion portion, 15 is a space portion provided between the inner layer portion 13 and the outer layer portion 12, and 16 is an air circulation hole penetrating the inner layer portion 13. Although it is at the bottom in the example, it may be provided at another place.

Reference numeral 17 designates a drain hole formed so as to penetrate the lower portion of the outer layer portion 12, and reference numeral 18 designates a flare formed at the end portion of the outer layer portion 12. The air circulation holes suppress the temperature rise of the outer layer part,
The ren hole contributes to the improvement of corrosion resistance.

[0014]

[0015]

As described above, the tail pipe of the automobile muffler of the present invention is formed by folding the outer layer portion by directly extending the pipe itself.
However, because it is integrated with the pipe, it is easy to manufacture.
It has high strength and can eliminate problems such as falling off. Moreover, the outer layer part
For supporting the, like forming a narrowed part and press-fitting, etc.
There is an advantage that the step of is not required.

Further , there is a space over the entire length between the inner layer portion and the outer layer portion.
The formation of the gap prevents heat conduction and is aesthetically advantageous.
is there.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view of an embodiment of the present invention.

FIG. 2 is a front view of a conventional technique.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a perspective view of a prior art retainer.

[Explanation of symbols]

 10 Muffler 11 Tail pipe 12 Outer layer part 13 Inner layer part 14 Inversion part 15 Space part 16 Air circulation hole 17 Drain hole 18 Flare

Claims (1)

(57) [Scope of utility model registration request] 1. The end of the tail pipe material is the pipe material itself.
Overall length between the folded-back radially outwardly extended, the inner layer part (13)
The outer layer portion (12) having the space portion (15) over the
Automobile muffler tail pipes, characterized in that the formed.