JP2539730Y2 - Shell structure of vehicle silencer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an improvement in a shell structure of a vehicle silencer mounted on a vehicle exhaust system.

[Conventional technology]

Conventionally, a muffler 1 as shown in Japanese Utility Model Laid-Open Publication No. 2-64714 or FIG. 4 is mounted on a vehicle exhaust system, and an expansion damping action of exhaust energy in an expansion chamber in the muffler 1 and a resonance chamber are provided. Exhaust noise is silenced by the resonance damping effect in the case.

Thus, in order to prevent the internal gas from leaking, the silencer 1 is formed by winding a single rectangular plate member 3 in a cylindrical shape as shown in Japanese Patent Application Laid-Open No. 61-195722 or FIG. After the one end 3a bent in the shape of a letter and the other end 3b bent in the L shape are overlapped, the both ends 3a and 3b are tightened with a wrap lock seamer to lock the seam as shown in FIG. A cylindrical shell 7 is formed by forming the portion 5, and further, end plates 9 are wound around both end openings of the shell 7 as shown in FIG.
The airtightness is ensured.

In FIG. 4, reference numerals 11 and 13 denote end plates 9 respectively.
And an inlet pipe and an outlet pipe inserted into the inlet pipe.

[Problems to be solved by the invention]

However, both ends 3a, 3 of the plate material 3 wound in a cylindrical shape as described above.
In the conventional shell structure in which b is simply wound with a wrap lock seamer, when the pressure inside the silencer 1 rises, or when a large internal pressure is applied to the lock seam portion 5 by a single pulsating pressure wave generated from the engine. In addition, there is a possibility that the tightness of the lock seam portion 5 may be loosened due to long-term use and the airtightness may be impaired.

The present invention has been devised in view of the above circumstances, and a vehicle silencer that can maintain the function of the silencer for a long period of time by preventing loosening of the winding of the lock seam portion due to an increase in internal pressure of the silencer or the like. It is an object of the present invention to provide a shell structure.

[Means for solving the problem]

In order to achieve such an object, the present invention provides a vehicle silencer shell structure in which a plate material is wound into a tubular shape and both ends thereof are tightly wound to form a lock seam portion. At the time of tightening both ends of the plate material, together with the both ends, the bar is interposed so as to be located at the center of the tightening portion,
The winding portion is formed to have a substantially circular cross section.

[Action]

According to the present invention, the bar suppresses the deformation of the shell against external force from the lateral direction of the shell, and even if a single pulsating pressure wave generated from the engine propagates into the muffler,
Also, even if the pressure inside the silencer rises and a large internal pressure is applied to the lock seam portion, the bar retains the caulking force at both ends of the plate material to prevent loosening of the tightening of the lock seam.

〔Example〕

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

In FIG. 1, reference numeral 15 denotes a shell, and an end plate 16 is wound around openings at both ends of the shell 15 to form a muffler.
17 are formed.

Although not shown, the shell 15 according to the present embodiment has a rectangular plate placed on a lower mold and the plate 15 in the same manner as in the molding method disclosed in Japanese Patent Application Laid-Open No. 61-195722. Place the mandrel on the top, raise the lower mold and move the plate
A step of bending both ends of the plate material bent into a substantially U-shape at approximately 90 °, a step of pressing both ends against a mandrel, and positioning one end inside the other end. , A step of bending one end of the end to the other end by a lap lock seamer, a step of pressing the end against the other end, and a step of bending the overlapped ends And a step of pressing the bent portion against the mandrel to form a lock seam portion 19 as shown in FIG. 1. As shown in FIG. 2, the lock seam portion of the shell 15 according to this embodiment is formed as shown in FIG. 19, shell 15
The rod material 21 having the same circular cross section as the total length 1 of the plate material 23a,
When tightening both ends 23a 'and 23b' of 23b,
It is interposed so as to be located at the center of the tightening portion together with a ′ and 23b ′, and is wound so as to form the tightened portion into a substantially circular cross section.

In forming the shell 15 in each of the above-mentioned steps (1) to (4), the bar 21 is formed by using a lap lock seamer to replace the tip 23a 'of one end 23a of the plate 23 with the other end in a step as shown in FIG. The bar 21 is arranged along the tip 23b 'of one end 23b of the plate 23 when pressed against the plate 23b. In this step, the tip 23a 'of the end 23a is changed to the end 23b.
The rod 21 is clamped between the two ends 23a 'and 23b' by pressing against the tip 23b ', and the rod 21 is wound around the lock seam 19 through the following steps. The shell 15 is formed.

Since the shell 15 according to the present embodiment is configured as described above, the bar 21 suppresses the deformation of the shell 15 against an external force from the lateral direction of the shell 15, and a single pulsation generated from the engine. Even if the pressure wave propagates into the silencer 17, and even if the pressure inside the silencer 17 rises and a large internal pressure is applied to the lock seam portion 19, the rod 21 will be positioned at both ends of the plate 23.
The caulking force of 23a, 23b is maintained to prevent loosening of the lock seam portion 19 during winding.

Therefore, according to the present embodiment, since the external force from the lateral direction of the shell 15, a single pulsating pressure wave generated from the engine and the loosening of the lock seam portion 19 due to an increase in the internal pressure of the silencer 17 are prevented. 4, the durability of the muffler 17 can be improved as compared with the conventional muffler 1 shown in FIG. 4, and the function of the muffler 17 can be favorably maintained for a long period of time.

In the above embodiment, the present invention is applied to a silencer in which the shell is formed of a single plate material, but the present invention relates to a two-layered shell composed of a cylindrical inner shell and an outer shell. It can also be applied to silencers it has.

[Effect of the invention]

As described above, the present invention relates to a vehicle silencer shell structure in which a plate material is wound into a tubular shape and both ends thereof are tightened to form a lock seam portion. When the both ends are wound, a bar is interposed so as to be positioned at the center of the tightened portion together with the both ends, and the tightened portion is formed to have a substantially circular cross section. Therefore, according to the present invention, not only the durability against external force from the lateral direction of the shell is improved, but also the spontaneous pulsating pressure wave generated from the engine and the increase in the pressure in the silencer increase. Even the lock seam part will not open,
Therefore, it is possible to maintain the function of the muffler satisfactorily for a long time.

[Brief description of the drawings]

FIG. 1 is a side view of a vehicle silencer according to an embodiment of the present invention. FIG. 2 is an end view taken along the line II-II of FIG. FIG. 3 is an end view of the same position as FIG. FIG. 4 is a side view of a conventional vehicle silencer. FIG. 5 is an end view of a shell showing a state before both ends of a plate material are tightened. FIG. 6 is an end view taken along line VV of FIG. [Description of Signs of Main Parts] 15 ... Shell 17 ... Muffler 19 ... Lock seam 21 ... Bar 23 ... Plate.

Claims (1)

(57) [Scope of request for utility model registration] A shell (15) for a vehicle silencer (17) having a lock seam portion (19) formed by winding a plate material (23) into a tubular shape and tightening both ends (23a, 23b) thereof. In the structure
The lock seam portion (19) is arranged such that when the both ends (23a, 23b) of the plate material (23) are tightened together with the both ends (23a, 23b), the bar (21) is positioned around the center of the tightened portion. A shell structure for a muffler for a vehicle, wherein the shell structure is interposed so as to be positioned, and the winding portion is formed to have a substantially circular cross section.