JPH03297528A - Porous body made of wire net and its manufacture - Google Patents

Abstract

PURPOSE:To give noise reduction properties and to improve impact resistance and rigidity by laminating and compressing several knitting wire nets, entangling wires of each knitting wire net and forming fine clearances which are communicated in three-dimensional direction. CONSTITUTION:Since a wire net porous body 12' forms fine clearances 13 which are communicated in three-dimensional direction and has a high porosity, when it is mounted on the outlet of a muffler, a satisfactory noise reduction effect is obtained. Further, since wires 10' of the knitting wire net 11' are entangled at random, the net has elasticity and can bear a shock such as the vibration and gas pressure of an engine, etc. Furthermore, since it is provided with enough rigidity, it can be mounted firmly on the outlet of the muffler and prevented from falling.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a porous body made of wire mesh used primarily to reduce muffler noise in general-purpose engines, and a method for manufacturing the same.

[Prior Art] Conventionally, in order to reduce the muffler noise of general-purpose engines, a metal foam 3 has been installed at the outlet 2 of the muffler body 1, as shown in FIG.
A means for holding and mounting the mounting cover 4 is adopted. In another embodiment, a baffle (wire mesh) is attached to the outlet of the tail pipe of the muffler, as shown in Japanese Utility Model Application No. 62-18323.

[Problems to be Solved by the Invention] However, in the former method, the cost of the metal foam 3 is high and the impact resistance against engine vibrations, gas pressure, etc. is poor, so there are restrictions on the mounting method.

The latter means cannot provide a sufficient sound deadening effect due to its thin thickness.

Muffler noise can be reduced by reducing the porosity of the porous body, but if it is too small, exhaust pressure increases and engine performance deteriorates. Therefore, in order to ensure sufficient silencing performance without sacrificing engine performance, that is, with high porosity, it is necessary to increase the thickness and form it into a three-dimensional mesh shape. However, simply overlapping the wire meshes does not provide a sufficient three-dimensional mesh, and the wire mesh lacks rigidity, so there is a risk that the wire mesh may fall off if the mounting method shown in FIG. 3 is used. Therefore, it was necessary to fix the wire mesh to the cover 4 by some method.

SUMMARY OF THE INVENTION Therefore, the present invention aims to provide a porous body made of wire gauze, which has a sound-dampening performance equivalent to or better than that of the metal foam described above, and has excellent impact resistance and rigidity, and a method for manufacturing the same.

[Means for Solving the Problems] The wire mesh porous body of the present invention for solving the above problems has the following features:
Several sheets of stockinette knitted wire mesh are piled up and compressed, and the wire rods of each stockinette knitted wire mesh are randomly intertwined to form minute gaps communicating in three-dimensional directions.

The method of manufacturing this porous body made of wire mesh according to the present invention involves processing a knitted stockinette wire mesh to create corrugations, then stacking several pieces of wire mesh with the directions of the waves intersecting each other; The corrugated pattern is characterized by press-forming a wire mesh to a certain thickness, and then shaping it into a desired shape.

[Function] The wire mesh porous body of the present invention having the above structure has minute gaps that communicate in three dimensions and has a high porosity, so when it is installed at the muffler outlet, a sufficient sound deadening effect can be obtained. . Furthermore, since the wires of the knitted wire mesh are randomly intertwined, it has elasticity and can sufficiently withstand shocks such as engine vibration and gas pressure. Furthermore, since it has sufficient rigidity, it can be firmly attached to the muffler outlet and can be prevented from falling off.

Further, according to the method for producing a porous wire mesh body of the present invention, a porous wire mesh body that exhibits the above-mentioned effects can be easily obtained at low cost, and the wire diameter of the wire mesh,
Number of lines, stockinette stitch size, corrugated size, number of layers,
By appropriately changing the pressing thickness and the like, the porosity can be arbitrarily selected and changed, so it is possible to obtain porous bodies made of wire mesh suitable for various usage modes. Furthermore, since the material of the knitted wire mesh can be freely selected, it is possible to obtain a porous body made of wire mesh that can be used for purposes other than muffler noise reduction.

[Example] An example of the wire mesh porous body of the present invention and its manufacturing method will be described. First, the manufacturing method will be explained. For example, as shown in FIG. In a direction perpendicular to the line direction, corrugations with a height of about 2.5 mm are processed at a pitch of about 5 mm as shown in FIG. 1(b). Next, this wave is wire mesh 11
Figure 1 (C
Intussusception as shown in 1. Next, the stacked corrugations are formed by press-molding the wire mesh 11 to form a porous wire mesh body 12 having a thickness of approximately 8 mm as shown in FIG. 1 (d+). In an example, as shown in FIG. 1 (el), it is pressed and formed into a circular shape with a diameter of about 35 mm.

The wire mesh porous body 12 manufactured in this way is made by stacking and pressing five sheets of stockinette knitted wire mesh 10, and the wire rods 10' of each stockinette knitted wire mesh 10 are randomly intertwined as shown in FIG. , a minute gap 13 communicating in three-dimensional directions is formed. Therefore, this wire mesh porous body 12° has a high porosity of about 90%, so the metal foam 3 shown in FIG.
Similarly, a wire mesh porous body 12 is placed at the outlet 2 of the muffler body 1.
If the cover 4 is used to hold the cover 4, a sufficient sound deadening effect can be obtained. Further, since the wire rods 10 of the stockinette wire mesh 10 are randomly intertwined, it has elasticity and can sufficiently withstand shocks such as engine vibration and gas pressure. Furthermore, as described above, the wire rods 10 of the knitted wire mesh 10 are randomly intertwined, each wire mesh 10 is reinforced and integrated, and has sufficient rigidity, so that the muffler main body 1 can be firmly attached to the outlet 2. , can prevent falling off.

In the method for producing a porous body made of wire mesh of the present invention, the porosity can be increased by appropriately selecting and changing the stockinette wire mesh lOO wire diameter, number of wires, stockinette stitch size, corrugation size, number of stacked sheets, press thickness, etc. can be arbitrarily changed, so it is possible to obtain porous bodies made of wire mesh that are suitable for various usage modes. Furthermore, since the material of the knitted wire mesh 10 can be freely selected, it is possible to obtain a porous body made of wire mesh that can be used for purposes other than muffler noise reduction.

[Effects of the Invention] As described above, the wire mesh porous body of the present invention has a high porosity, so that a sufficient muffling effect can be obtained for muffler noise reduction. Also, since it has elasticity, it can sufficiently withstand shocks such as engine vibration and gas pressure. Furthermore, since it has sufficient rigidity, it can be firmly attached and will not fall off.

Further, according to the method for producing a porous wire mesh body of the present invention, the above-mentioned excellent porous wire mesh body can be easily obtained at low cost, and the specifications of the stockinette wire mesh are 7, number of sheets, press thickness, etc. By appropriately selecting and changing the size, etc., the porosity can be changed arbitrarily, and porous bodies made of wire mesh can be obtained in accordance with various usage modes. Moreover, since the material of the knitted wire mesh can be freely selected, it is possible to obtain a porous body made of wire mesh that can be used for purposes other than muffler noise reduction.

[Brief explanation of drawings]

Figure 1 (al to (b) is a diagram showing the steps of the method for manufacturing a porous wire mesh body of the present invention, Figure 2 is a cross-sectional view of the porous wire mesh body of the present invention, and Figure 3 is a diagram showing the steps of the method for producing a porous body made of wire mesh of the present invention. It is a diagram showing a state in which a foam is provided at the outlet of the muffler body to reduce muffler noise. 10...Stockinette knitted wire mesh 10°...Wire rod 11
...Corrugated wire mesh 12,12°...Wire mesh porous body 13...Gap

Claims (2)

[Claims] (1) A porous body made of wire mesh, which is made by stacking and compressing several sheets of knitted wire mesh, and the wire rods of each knitted wire mesh are randomly intertwined to form minute gaps that communicate in three dimensions. (2) A stockinette knitted wire mesh is corrugated, then several pieces of this corrugated wire mesh are piled up with the directions of the waves intersecting, and then the piled up corrugated wire mesh is press-formed to a certain thickness. A method for producing a porous body made of wire mesh, characterized in that the porous body is formed into a desired shape.