JP2003113714A - Vehicular muffler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicular muffler that is reduced in weight. SOLUTION: An outer shell 22 is wound around a core subassembly 20 to form a cylindrical outer shell 2. Cylindrical portions 4a and 6a of outer plates 4 and 6 with the cylindrical portions 4a and 6a formed for press fitting in the outer shell are press-fitted in the cylindrical outer shell 2. Overlaps between the outer shell 2 and the outer plates 4 and 6 are next welded throughout the circumference by laser welding.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle silencer for reducing exhaust noise of a vehicle.

[0002]

2. Description of the Related Art Conventionally, in a vehicle silencer, as shown in FIG. 4, a plate member 50 is double wound and a cylindrical outer shell 52 having ends fixed by spot welding is formed. next,
The flare 54 is formed by flanging processing in which the outer peripheral edges of both ends of the outer shell 52 are raised outward in the radial direction. In addition, the middle subassembly product 60 in which the muffler tube 58 is incorporated in the partition wall 56 that serves as a partition of the internal space is assembled. Then, the middle subassembly product 60 is press-fitted into the outer shell 52 to fix the outer shell 52 and the partition wall 56 by spot welding. Next, the outer plate 62 was formed by fixing the outer plates 62 to the flares 54 at both ends of the outer shell 52 by winding.

[0003]

However, in such a conventional one, since the outer plate 62 is inserted into the outer shell 52 and is wound, the outer shell 52 is wound.
Was getting longer. That is, as shown in FIG. 5, the outer plate 62 includes a plate portion 62a, a tubular portion 62b, and a flare portion 62c, and the tubular portion 62b from the plate portion 62a side.
Is inserted into the outer shell 52, and the flare 54 and the flare portion 62c are butted and fastened. Therefore, since the plate portion 62a is arranged at the position of the depth D inward from the end of the outer shell 52, a dead space of the depth D is generated at both ends with respect to the entire length of the outer shell 52, which hinders weight reduction. There was a problem that sometimes. In addition, there is a problem in that the shape of the outer plate 62 is also restricted in order to fix it by winding.

An object of the present invention is to provide a vehicle silencer that is lighter in weight.

[0005]

In order to achieve the above object, the present invention takes the following means in order to solve the object. That is, a silencer for a vehicle, characterized in that a tubular outer shell is press-fitted with the tubular portion of an outer plate having a tubular portion that can be press-fitted into the outer shell, and the outer shell and the outer plate are laser-welded. That is it.

It is preferable that the overlapping portion of the outer shell and the outer plate is welded all around. Further, a tapered portion may be formed at the end of the outer shell, or a tapered portion may be formed at the end of the outer plate.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings. As shown in FIG. 2, reference numeral 1 denotes a vehicle silencer, and the vehicle silencer 1 includes an outer shell 2 formed in a tubular shape, and outer plates 4 and 6 closing both ends of the outer shell 2.

The outer shell 2 is formed into a cylindrical shape by double winding a thin plate, and the outer plates 4 and 6 are provided with cylindrical portions 4a and 6a which can be press-fitted into the outer shell 2.
In this embodiment, the tapered portion 4 is provided on the tip side of the tubular portions 4a and 6a.
b and 6b are formed. Further, the tubular portions 4a and 6a are
The outer shell 2 is formed so as to have an outer diameter that is larger than the inner diameter of the outer shell 2 by about 0 to 4 mm, and the tubular portions 4a and 6a are press-fitted into the outer shell 2, and at that time, between the outer shell 2 and the tubular portions 4a and 6a. It is structured so that there are no gaps. The taper portions 4b and 6b are formed so as to be inclined inward in the radial direction, and are formed so as to be easily press-fitted when the tubular portions 4a and 6a are press-fitted into the outer shell 2. Plate portions 4c and 6c are provided so as to close the cylindrical portions 4a and 6a.

In the outer shell 2, a plurality of partition walls 8,
10 is provided to partition the outer shell 2 into a plurality of chambers. Further, an inlet pipe 12 is provided so as to penetrate the one outer plate 4 and the partition walls 8 and 10, and
An outlet pipe 14 is provided through the other outer plate 6 and the partition walls 8 and 10.

The inlet pipe 12 is inserted into an insertion hole 16 formed in one outer plate 4 so that it can be connected to an exhaust pipe on the upstream side (not shown). Further, the outlet pipe 14 is configured to be inserted into an insertion hole 18 formed in the other outer plate 6 so as to be connectable to an exhaust pipe on the downstream side not shown.

Next, a manufacturing process of the above-described vehicle silencer will be described with reference to FIG. First, a plurality of partition walls 8 and 10
Then, the inlet pipe 12 and the outlet pipe 14 are assembled to each other to assemble the intermediate subassembly product 20. And the partition wall 8,
The outer shell 22 is doubly wound around the outer periphery of 10, and the outer shell 22 and the partition walls 8 and 10 are fixed by laser welding from the outside. Further, the end of the outer shell 22 is fixed by laser welding to form the cylindrical outer shell 2.

Next, on both sides of the outer shell 2, the inlet pipe 1
While inserting 2 and the outlet pipe 14 into the insertion holes 16 and 18, respectively, the cylindrical portions 4a and 6a of the outer plates 4 and 6 are press-fitted. Then, the outer shell 2 and the cylindrical portions 4a, 6
The overlapped portion with a is welded all around by laser welding.

At this time, the outer shell 2 has cylindrical portions 4a and 6a.
Since there is no space between the outer shell 2 and the tubular portions 4a and 6a, the outer shell 2 and the tubular portion 4 are pressed.
The overlapping portion with a and 6a can be laser-welded from the outside of the outer shell 2. Also, the outer plates 4, 6
Since the cylindrical portions 4a and 6a are inserted into the outer shell 2 and the plate portions 4c and 6c are inflated to the outside of the outer shell 2, the entire length of the outer shell 2 can be effectively used and the outer shell 2 can be downsized. -Can be made lighter.
Further, the outer plates 4 and 6 are not limited to the shape of the present embodiment, but can be formed in various shapes, so that the degree of freedom of shape is high.

Further, as shown in FIG. 3A, the cylindrical portion 6a
3 is not limited to the case where the tapered portion 6b is formed on the front end side of FIG.
As shown in (b), the outer shell 6 is formed with a taper portion 2a that is expanded outward in the radial direction at the end of the outer plate 6.
The cylindrical portion 6a may be easily press-fitted. Alternatively, FIG.
As shown in (c), at the end of the outer shell 2, the tubular portion 6a
The expanded diameter portion 2b having substantially the same length as the above may be formed, and the tapered portion 2a may be formed on the tip side of the expanded diameter portion 2b. By forming the enlarged diameter portion 2b, the tubular portion 6 is extended to the back of the enlarged diameter portion 2b.
If a is press-fitted, the press-fitting is completed, and the press-fitting of the tubular portion 6a can be easily determined.

Further, as shown in FIG. 3D, not only is the case in which the cylindrical portion 6a of the outer plate 6 is press-fitted into the inner circumference of the outer shell 2, but the tapered portion 6b is formed so as to expand radially outward. In addition, the cylindrical portion 6a of the outer plate 6 may be press-fitted onto the outer periphery of the outer shell 2. At this time, as shown in FIG. 3 (e), a taper portion 2a may be formed on the tip end side of the outer shell 2 to facilitate press-fitting of the tubular portion 6a. Alternatively, as shown in FIG. 3F, a reduced diameter portion 2c having substantially the same length as the cylindrical portion 6a is provided at the end of the outer shell 2.
And the tapered portion 2a is formed on the tip side of the reduced diameter portion 2c.
Alternatively, the cylindrical portion 6a may be press-fitted into the reduced diameter portion 2c.

Further, as shown in FIG. 3 (g), the cylindrical portion 6a
When the tapered portion 6b is formed on the tip side of the outer plate 6 and the cylindrical portion 6a of the outer plate 6 is formed by reducing the diameter to form the step portion 6d on the outer peripheral side and the cylindrical portion 6a is press-fitted into the outer shell 2, Alternatively, the tip of the outer shell 2 may be brought into contact with the step 6d. Alternatively, as shown in FIG.
While forming the taper portion 6b by expanding the diameter outward in the radial direction,
The tubular portion 6a of the outer plate 6 is formed to have an enlarged diameter to form a step portion 6d on the inner peripheral side, and when the tubular portion 6a is press-fitted into the outer shell 2, the tip of the outer shell 2 contacts the step portion 6d. It may be configured as follows. The other outer plate 4
Is also the same.

The present invention is not limited to such an embodiment as described above, and can be carried out in various modes without departing from the scope of the present invention.

[0018]

As described in detail above, the vehicle muffler of the present invention has the effect of being lighter in weight because the outer shell can be formed to be short. Also, the degree of freedom of the shape of the outer plate is high.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a manufacturing process of a vehicle silencer according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the vehicle silencer of the present embodiment.

FIG. 3 is an explanatory diagram showing a press-fitted state of the outer shell and the outer plate of the present embodiment.

FIG. 4 is an explanatory view showing a manufacturing process of a conventional vehicle silencer.

FIG. 5 is an enlarged sectional view of a winding tightening portion of a conventional vehicle silencer.

[Explanation of symbols]

1 ... Muffler for vehicle 2, 52 ... Outer shell 2a ... tapered part 2b ... expanded part 2c ... reduced diameter part 4, 6, 62 ... Outer plate 4a, 6a ... Cylindrical part 4b, 6b ... Tapered part 4c, 6c ... Plate part 8, 10, 56 ... Partition wall 12 ... Inlet pipe 14 ... Outlet pipe 16, 18 ... Insertion holes 20, 60 ... Middle assembly sub-assembly product 22 ... Outer shell

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hisanori Noda             A lid, Ochaya, Hashime-cho, Okazaki-shi, Aichi             Within Ba Sangyo Co., Ltd. F-term (reference) 3G004 AA01 BA00 BA09 CA04 DA07                       GA00 GA06                 4E068 BG02 DA00

Claims (4)

[Claims] 1. A vehicle for a vehicle characterized in that the outer shell and the outer plate are laser-welded to each other by press-fitting the outer shell having an outer plate having a cylindrical portion that can be press-fitted into the outer shell. Silencer. 2. The silencer for a vehicle according to claim 1, wherein the overlapping portion of the outer shell and the outer plate is welded over the entire circumference. 3. The silencer for a vehicle according to claim 1, wherein a taper portion is formed at an end of the outer shell. 4. The silencer for a vehicle according to claim 1, wherein a taper portion is formed at an end of the outer plate.