JP3676872B2 - Silencer manufacturing method - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a process for producing a muffler. More specifically, an internal combustion engine for an automobile, in which only a scroll-like sound absorbing material formed by winding a glass wool mat or the like is used, and a porous inner tube is arranged at an eccentric position of a circular or elliptical cross section of the scroll-like sound absorbing material. the method of manufacturing a muffler suitable for use auxiliary silencer.
[0002]
[Prior art]
Various silencers have been proposed in the past in which a sound absorbing material such as glass wool is filled between the porous inner tube and the outer tube. For example, a sound absorbing type disposed in the exhaust system of an internal combustion engine of an automobile. A typical example of the auxiliary silencer is a silencer in which a sound-absorbing material mat is manually wound around in multiple layers and formed into a cylindrical shape with a porous inner tube as a core and inserted into an outer cylinder.
[0003]
When such a cylindrical auxiliary silencer is disposed in the middle of an exhaust system of an internal combustion engine of an automobile, the porous inner pipe is formed into a cylindrical shape due to restrictions on the layout of the exhaust system due to the design of the vehicle body. In some cases, it is necessary to provide the sound absorbing material at an eccentric position, or it is required to make the cross-sectional shape of the silencer elliptical or other flat shape and to provide the porous inner tube at the eccentric position.
[0004]
[Problems to be solved by the invention]
In such a case, for example, when the glass wool mat is rolled up, an elaborate work such as biasing the position of the perforated inner tube by sandwiching a piece of glass wool mat or the like cut into a small side is forced. Be lost.
[0005]
In such a case, the present invention can simplify processing, and a method for producing a silencer comprising a wound sound absorbing material such as a glass wool mat, which can be arranged at an arbitrary position without any restriction on the porous inner tube. The purpose is to provide.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, a silencer manufacturing method according to the present invention has the following configuration. That is, a glass wool mat or the like is wound into a round shape such as a circular cross section or a flat shape such as an ellipse to form a scroll-like sound absorbing material, and the scroll-like sound absorbing material is filled into an outer cylinder of the same shape and size as the scroll. At the eccentric position of the cylindrical sound absorbing material, a positioning rod is inserted between the layers of the scroll-shaped sound absorbing material to spread the interlayer at the eccentric position, and from the side opposite to the insertion direction of the positioning rod, After inserting the tube guide tube and pushing out the positioning rod, and then inserting the porous inner tube placed on the porous inner tube receiving portion along the porous inner tube guide tube to a predetermined position, then pulling out only the porous inner tube guide tube, Both end surfaces of the outer cylinder are closed with end plates.
[0007]
As described above, the manufacturing method of the silencer according to the present invention is formed from only roll-like sound absorbing material of the glass wool mat, the muffler perforated inner pipe is placed in an eccentric position, when assembled, conventional eccentric silencer Like a container, a piece of a wound sound-absorbing material such as a glass wool mat cut between the rolled-up sound-absorbing materials is sandwiched on one side, and the porous inner tube is set at an eccentric position on the opposite side Such elaborate work is not required.
[0008]
Moreover, the cross-sectional shape can form scroll-shaped sound-absorbing materials, such as a glass wool mat, in arbitrary shapes, such as flat shapes, such as a perfect circle shape and an ellipse. Further, the position of the porous inner tube can be arranged without any restriction.
[00 09 ]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an example of a method for manufacturing a silencer according to the present invention will be described in detail with reference to the drawings.
[001 0 ]
1 is a transverse sectional view showing an example of a silencer to which the present invention is applied , FIG. 2 is a longitudinal sectional view taken along line AA in FIG. 1, and FIGS. 3A to 3D are silencers according to the present invention. an example of a method of manufacturing a perspective view for explaining the first half of the manufacturing process, Fig. 4 (e) ~ (h) are cross-sectional views for explaining the second half of the same manufacturing process.
[001 1 ]
1 and 2, reference numeral 1 denotes a perforated inner tube disposed at an eccentric position of a roll-shaped sound absorbing material 2 such as a glass wool mat, and 3 denotes an outer cylinder of a silencer.
[001 2 ]
Hereinafter, an example of a method for manufacturing a silencer according to the present invention will be described step by step. First, a glass wool mat, which is a sound absorbing material, is formed into a perfect scroll. The state is shown in FIG. Next, the scroll-like sound absorbing material 2 is slightly pressed in one direction as shown in FIG. 3 (b) to form an elliptical cross section, and is substantially the same shape and size as shown in FIG. 3 (c). The outer cylinder 3 is filled. In this case, only the center portion of the glass wool mat can be made hollow and wound into a perfect circle, and it can be slightly pressurized in the same manner as described above to make it oval.
[001 3 ]
The outer diameter of the glass wool mat-like sound absorbing material 2 is the same as that of the porous inner tube 1 between the predetermined eccentric positions between which the porous inner tube is to be disposed, and is slightly larger than the outer diameter of the porous inner tube 1. The positioning rod 4 is inserted to push the interlayer of the glass wool mat roll-shaped sound absorbing material 2. In addition, if it inserts while rotating the positioning rod 4, it will be easy to enter. Further, as shown in FIG. 3 (d), the positioning rod 4 has a sharpened tip so that it can be easily inserted between the layers of the glass wool mat-like sound absorbing material 2. It is desirable that the length of the positioning rod 4 is the same as the length of the porous inner tube 1 to be disposed at least in the cylindrical portion excluding the tip.
[001 4 ]
When inserting the positioning rod 4 into the roll-shaped sound absorbing material 2 of the glass wool mat, it is easy to do so by sandwiching both ends of the silencer with a pair of plate-like jigs 5. FIG. 4E is a cross-sectional view showing a state in which the positioning rod 4 is inserted into the roll-shaped sound absorbing material 2 of the glass wool mat, and 5 is the plate-shaped jig. 4 shown on the right side of FIG. 4 (e) is a porous inner tube guide tube for inserting the porous inner tube 1 into the glass wool wound sound absorbing material 2, and has an inner diameter slightly larger than the outer diameter of the porous inner tube 1. And the inner diameter of the tube is the same as that of the positioning rod 4, and the inner perforated tube 1 can be freely slid in the tube. The perforated inner tube guide tube 6 has a structure connected to the perforated inner tube receiving portion 7 shown on the right side of the drawing, and the inner perforated tube receiving portion 7 has a semicircular cross section excluding the upper half. It has become.
[001 5 ]
The porous inner tube guide tube 6 is applied to the pointed tip of the positioning rod 4, the porous inner tube guide tube 6 is inserted from the opposite side to the insertion direction of the positioning rod 4, and the positioning rod 4 is pushed back while the porous inner tube guide tube 6 is pushed back. It is inserted into the wound acoustic material 2 of glass wool mat. FIG. 4 (f) shows a state in which the positioning rod 4 has been completely pushed out and the porous inner tube guide tube 6 has been inserted into the wound acoustic material 2 of glass wool mat. After the porous inner tube 1 is placed on the porous inner tube receiving part 7 and the porous inner tube 1 is inserted into the roll-shaped sound absorbing material 2 of the glass wool mat using the push-in rod 8 (FIG. 4G). If the porous inner tube guide tube 6 is extracted, the porous inner tube 1 is arranged at the position where the positioning rod 4 is inserted in the glass wool mat roll-like sound absorbing material 2 (FIG. 4 (h)). Thereafter, both end faces of the outer cylinder are closed with end plates (not shown in the figure) to form a silencer.
[001 6 ]
【The invention's effect】
Method for manufacturing a muffler according to the present invention since it is the arrangement, Ru can a perforated inner pipe easily disposed without receiving also any constraints at a predetermined position of the roll-shaped sound absorbing material such as glass wool mat. Also, when placing the perforated inner tube in an eccentric position, it is an extremely simple method without the hassle of biasing the position of the perforated inner tube by filling a piece of sound absorbing material such as glass wool mat on one side as in the conventional processing method In addition, the accuracy of the position of the perforated inner tube is good, the sound absorbing material such as glass wool mat is reduced, and the process can be easily automated.
[Brief description of the drawings]
1 is a cross-sectional view showing an example of a silencer to which the present invention is applied . FIG. 2 is a vertical cross-sectional view taken along the line AA in FIG. 1. FIGS. 3A to 3D are related to the present invention. The perspective view for demonstrating the first half of an example of the manufacturing process of a silencer [FIG. 4] (e)-(h) Sectional drawing for demonstrating the second half following FIG.
DESCRIPTION OF SYMBOLS 1 Porous inner tube 2 Wind-like sound absorbing material of glass wool mat 3 Silencer outer cylinder 4 Positioning rod 5 Jig 6 Porous inner tube guide cylinder 7 Porous inner tube receiving part 8 Push rod

Claims (1)

Winding a glass wool mat or the like into a round shape or a flat shape such as an ellipse to form a scroll-like sound absorbing material. At the eccentric position of the material, a positioning rod is inserted between the layers of the scroll-like sound absorbing material to expand the interlayer at the eccentric position, and from the opposite side to the insertion direction of the positioning rod, a porous inner tube guide having a porous inner tube receiving portion After inserting the tube and pushing out the positioning rod, and then inserting the porous inner tube placed on the porous inner tube receiving portion along the porous inner tube guide tube to a predetermined position, then pulling out only the porous inner tube guide tube and removing the outer tube A method for producing a silencer, characterized in that both end faces of the sound are closed with end plates .

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