JP2598144B2 - Exhaust silencer and manufacturing method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an exhaust system of the type comprising an inner pipe capable of radially permeating gas, an outer casing, and a noise-suppression material usually disposed between the pipe and the outer casing. Regarding silencers. The noise-suppressing material is composed of mineral fibers, steel fibers, or metal fibers of this kind.

The invention also relates to a method of manufacturing an exhaust pipe of the type described above, in particular its inner pipe.

Known techniques are disclosed by Swedish Patents 7311076-9 and 8500785-4 and British Patent 1191125.

According to the known art, the basic idea is to provide a bendable exhaust silencer, however, the conventional design requires that the exhaust pipe be manufactured in a desired shape to fit the special model vehicle. Also, there are some disadvantages with respect to molding into a single piece.

It is noted here that the exhaust pipe is particularly preferably used in motor vehicles, but is perfectly well applied to other applications, for example exhaust systems or other fluid conduit systems. Should be.

One object of the present invention is to provide a new exhaust silencer and a new method of manufacturing the same while also being able to bend to a desired shape and substantially retaining its axial length when bent, and An object of the present invention is to provide a method for quickly and easily manufacturing a silencing pipe capable of maintaining a cross section. Other objects and advantages of the present invention are disclosed in the following description, and will be apparent to those skilled in the art who study this description.

Thus, according to the present invention, there is provided a silencer of the type comprising an inner pipe permeable to gas in the radial direction, an outer casing, and a noise-suppression material usually arranged between the pipe and the casing, And according to the invention, the exhaust pipe is formed from a strip of perforated ring whose inner pipe is joined in the axial direction, said ring comprising:
With axially concave cross-section and with legs of different lengths in cross-section when viewed from the axial cross-section, the ring has a larger flange of one ring and a smaller flange of an adjacent ring. Upset on the flange of
It is characterized by being flexibly connected to each other. The pipe section of the inner pipe preferably has an axial length smaller than the diameter. The pipe sections of the inner pipe are preferably joined by upset means to form a ball and socket type joint.

The casing is preferably composed of a curable material and is deformable before being cured. The casing can be composed of at least one layer made of a strip material that is partially overlapped and spirally wound, for example a metal strip material, and between the turns in the overlap area. A curable adhesive is interposed. The casing may be configured to be cured by heat from its exhaust gas after being mounted on the vehicle. Alternatively, the curable material may be configured to be cured by moisture in the air or the like, in which case the exhaust pipe may be provided to prevent pre-solidification of the curable material. An air-tight coating is applied immediately after production.

A method for producing an exhaust silencer comprises producing an inner pipe that is radially permeable to gas, and providing this pipe with a casing and a noise-suppression material normally disposed between the pipe and the casing. Consists of The method is then made by forming a perforated, generally cylindrical ring from a strip material, e.g., a metal strip material, wherein the ring is outwardly concave when viewed from an axial cross-section. The rings having axial cross-sections and different lengths of cross-sectional legs, and the rings are disposed axially with respect to each other such that the larger flange of one ring is positioned on the smaller flange of the adjacent ring. To be flexibly coupled by being upset to
Substantially characterized. The pipe section preferably has an axial length smaller than the diameter.

The cross-sectional structure of the pipe section and the upset are designed to form a ball and socket type joint. Proper adjustment of the upset provides a certain amount of friction in the fitting designed to deform the pipe to the desired shape, thereby keeping the exhaust pipe in a shape adapted to its initial position. You. In this way, the exhaust pipe can be easily installed and then permanently fixed. According to a preferred embodiment,
The exhaust pipe is formed to be hardenable, for example by means of a hardenable material, and is configured such that its final shape is only fixed after the exhaust pipe has been mounted at the application site. The curing can be effected in the usual way, ie by means of heat from the exhaust gas flowing in the pipe, or by means of atmospheric humidity around the fitted exhaust pipe.

The present invention will now be described with reference to the accompanying drawings, which illustrate, by way of example only, one embodiment in a schematic diagram.

FIG. 1 shows a schematic cross-sectional view in the axial direction of the exhaust pipe according to the present invention at the time of manufacturing the internal pipe, and FIG. 2 shows a schematic cross-sectional view in the axial direction of the exhaust pipe according to the present invention. .

First, referring to FIG. 2, an exhaust pipe according to the present invention includes an inner pipe 2 that can transmit gas in a radial direction, a casing 4 surrounding the pipe 2, and noise disposed between the pipe 2 and the casing 4. It can be seen that it is composed of the inhibitor 3.

The pipe 2 shown in FIG. 1 is formed from a generally cylindrical ring 10 of a metal strip material. As viewed from the axial cross section, the ring has an outwardly concave transverse section 5 and the legs 6, 7 are formed with different lengths.
The larger diameter end of the new ring is inserted in the direction of arrow 11 over the smaller diameter end of the adjacent ring. The larger diameter flange 6 is then fitted onto the smaller flange 7 of the adjacent ring by a radially inwardly directed upset operating means indicated by arrow 12. By repeating this operation, a pipe 2 having a desired length is gradually manufactured. The flanges 6 and 7 are sized and shaped to provide a ball-and-socket style joint when a radial upset operation is applied, thereby allowing for angle adjustment between adjacent rings 10. , Without substantially changing the axial spacing between them. As shown in FIG. 1, the ring 10 is provided with a number of holes 8.

Referring again to FIG. 2, the exhaust pipe is provided on the outside of the pre-assembled pipe 2 with a noise-suppressing material, for example a layer of mineral fibres, steel fibres or the like and usually of a continuous laminar shape. After being provided with 3, a casing 4 is then produced. In the embodiment shown, the casing 4 is composed of a thin metal strip 41 spirally wound with an overlap 42 between adjacent turns. The strip 41 is provided with a curable adhesive 43 at least in the overlap area. The adhesive 43 may be of a temperature setting type. The adhesive solidifies after the exhaust system has been bent into the desired shape and is mounted, for example, in the desired position on the motor vehicle, thereby solidifying the casing 4 and thus the entire exhaust system.

If the exhaust pipe is used where no extra heat is applied to cure the adhesive properly,
Curable adhesives can be of the type that solidifies under the influence of components from the surrounding environment, such as, for example, moisture. However, in this case, the exhaust pipe must be hermetically sealed immediately after it has been manufactured to prevent pre-solidification.

Claims (9)

(57) [Claims] 1. A noise filter which is arranged between the inner pipe (2) and the outer casing (4), which can radially permeate the gas, and usually between the pipe (2) and the outer casing (4).
In an exhaust silencer comprising a damping material (3), the inner pipe is formed from the strip material of a perforated ring (10) which is connected axially, said ring being, when viewed from an axial cross section, an outer ring. It has a recessed transverse part (5) and is provided with cross-sectional legs (6, 7) of different lengths, and this ring (10) has a longer flange (6) of one ring. An exhaust silencer characterized in that it is upset (12) on the shorter flange (7) of an adjacent ring (10) and is flexibly connected to each other. 2. The exhaust pipe according to claim 1, wherein the axial dimension of the ring is smaller than the inner diameter. 3. The exhaust system according to claim 1, wherein the cross-sectional shape of the ring and the coupling upset are configured to form a ball-and-socket type joint therebetween. pipe. The casing (4) is made of a curable material (4).
The exhaust pipe according to any one of claims 1 to 3, wherein the exhaust pipe comprises (3) and is deformable before curing. 5. The casing (4) comprises at least one layer made of a helically wound strip material (1) with a partial overlap (42), the overlap area comprising: The exhaust pipe according to claim 4, wherein a curable adhesive (43) is interposed between the winding portions in (1). 6. The exhaust pipe according to claim 1, wherein the casing is configured to be cured by heat from exhaust gas passing through the exhaust pipe. 7. An inner pipe (2) through which gas can permeate in a radial direction is provided with a casing (4) and a noise-suppressing material usually arranged between the pipe (2) and the casing (4). In a method for manufacturing an exhaust silencer, the inner pipe (2) is constituted by manufacturing a generally cylindrical perforated ring (10) from a strip material, said ring when viewed from an axial cross section. With outwardly concave transverse sections (5) and with different lengths of cross-sectional legs (6, 7), the rings (10) being arranged axially one after the other, An exhaust muffler characterized in that it is flexibly connected to each other by upsetting the longer flange (6) of one ring (10) on the shorter flange of an adjacent ring (10). Production method. 8. The method according to claim 7, wherein the ring is shaped and upset to form a ball-and-socket type joint (1). 9. The casing is manufactured by spirally winding a strip-shaped material (41) with a partial overlap (42) and is curable in the overlap. A material (43) is provided, and the adhesive is solidified to secure the exhaust pipe when the exhaust pipe is given a desired shape.
Or the method of 8.