JPS6035527B2 - Honeycomb support cushion body for exhaust gas purification - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a cushion body that supports a honeycomb that is installed in the middle of an exhaust pipe to purify exhaust gas from wheels of an automobile or the like.

(Prior art) Conventionally, a cylindrical wire mesh made of heat-resistant wire is wrapped in a bag to form a cyclic polymer, and this is compressed to form a cylindrical polymer at the end of the honeycomb as shown in Figures 8 and 9. The cylindrical part 2a is iron-fitted to the
The cushion body 2 integrally formed with the inwardly facing flange 2b that rests on the end face of the cushion body 2 is manufactured by, for example, Japanese Utility Model Publication No. 50-409.
Although it is publicly known from Publication No. 1, the conventional one has a cylindrical part 2.
Since a and the flange part 2b are integrally compression-molded, the compression density becomes the same.

However, in addition to the vibrations of the vehicle body, vibrations due to exhaust gas pulsation act more strongly on the honeycomb 1 in the axial direction, so the compression density of the flange 2b that receives the axial vibration of the honeycomb 1 is determined by the radial vibration of the honeycomb 1. It is necessary that the compressed density be greater than that of the receiving cylindrical portion 2a. Conventional cushion bodies have the same density, so if they are aligned in the radial direction, the cushioning in the axial direction will not be sufficient, and the honeycomb will move due to vibration, resulting in insufficient vibration absorption.Also, if the cushioning bodies are aligned in the koji direction, the radial cushioning will be too strong. There was a drawback that too much damage to the honeycomb occurred. Therefore, as shown in Publication No. 49-64717, it was considered that the cylindrical part and the flange part of the cushion were molded separately, each having a predetermined compression density, and then attached to the honeycomb circumference and end part, but both This had the disadvantage that a protective ring had to be used to integrate the two, making the structure complicated. (
Purpose) The object of the present invention is to absorb vibrations applied in the axial direction due to exhaust gas pulsation in addition to vehicle body vibrations transmitted to the honeycomb, and to reliably support the honeycomb so that it does not move within the exhaust pipe.

(Structure) In order to achieve the above-mentioned object, the present invention compresses the lower part from the middle of the final knitted wire mesh to form a flange part, compresses the upper part from the middle to form a cylindrical part, and the flange part is made from the cylindrical part. It is characterized by having a high density, and the connecting part between the two is a circular band of flexible, constant-length knitted wire mesh.

As a result, in addition to the vibrations of the vehicle body transmitted to the honeycomb, it is possible to reliably absorb the vibrations applied in the axial direction due to the pulsation of exhaust gas.
This has the effect of preventing the honeycomb from rotating or moving within the exhaust pipe, resulting in insufficient exhaust gas purification. FIGS. 1 to 3 show a first embodiment of the method of molding the product of the present invention, in which an annular step 11 is formed in the center of a cylindrical core metal 10, and the diameter becomes smaller at the bottom.

A knitted wire mesh 12 is wrapped around this outer periphery in the form of a belt or wrapped in a cylindrical shape, and a pressing member 13 is applied from the outside above the middle part.
is brought into contact with the outer mold 14, and the lower cylinder 15 is pressed.
Then, the cylindrical wire mesh below the intermediate portion is pressed and compressed onto the annular step 11 to form the collar portion 16. Next, remove the pressing member 13,
The upper cylinder 17 is inserted between the outer mold 14 and the core metal 10, and the cylindrical wire mesh 12 at the upper middle portion is pressed and compressed from above to form the cylindrical portion 8. The density of the collar part 16 is usually 15 to 20%.
Therefore, the appropriate density of the cylindrical portion 18 is about 10%. The lower end of the inner surface of the cylindrical portion 18 is connected to the flange portion 16 by a flexible constant-length knitted wire mesh annular band 19 at a position where it abuts on the flange portion 16. Further, as shown in FIG. 5, a flange 21 is formed on the inner surface of the intermediate part of the outer mold 20, and a cylindrical wire mesh 12 that is wrapped around or covered with the outer circumference of the core metal 10 is pressed by the lower end of the large diameter of the core metal 10. When the upper cylinder 22 and the lower cylinder 23 inserted between the mold 10 and the outer mold 20 are pressed simultaneously, the flange 24 and the cylindrical part 25 are formed at the same time, and the lower end of the inner surface of the cylindrical part 25 is made of a flexible constant middle lining. They are connected together by a wire mesh annular band 26.

According to the present invention, the cushion body 16 shown in FIG.
The density of the cylindrical portion 18 is higher than that of the cylindrical portion 18, and the density of the flange portion 24 of the cushion body shown in FIG. It can have elasticity suitable for the vibrations of
Not only can vibrations of the honeycomb be sufficiently absorbed to prevent the honeycomb from rotating or moving, but since the flange and cylindrical part are integrally connected, there is no need to provide a protective ring. In addition, when the cushion body shown in FIG. 6 is placed over the honeycomb 27 as shown in FIG. 7, the top of the flexible constant annular band 26 of the knitted wire mesh is tightened with a wire or a band to prevent the honeycomb 27 from rotating. Breakage of the fragile and weak honeycomb 27 can be prevented. (Effects) According to the present invention, the part below the middle of the knitted striped wire mesh is compressed to form a flange part, the part above the middle is compressed to form a cylindrical part, and the density of the flange part is made higher than that of the cylindrical part. The connecting part between the two is made of a flexible, constant stockinette wire mesh annular band, which can reliably absorb not only the vibrations of the car body transmitted to the honeycomb, but also the vibrations applied in the direction of the exhaust gas due to the pulsation of exhaust gas, and the honeycomb rotates within the exhaust pipe. This has the effect of preventing insufficient purification of exhaust gas due to movement or movement.

[Brief explanation of drawings]

1 to 3 are front sectional views sequentially showing the first molding method of the product of the present invention, FIG. 4 is a front sectional view of the first embodiment of the present invention molded by the method, and FIG. FIG. 6 is a front sectional view showing the second molding method of the invention, FIG. 6 is a front sectional view of the second embodiment of the present invention molded by the method, and FIG. 7 is a diagram showing the second embodiment of FIG. 6 in use. FIG. 8 is a cutaway front view of the main part when the conventional product is in use, and FIG. 9 is a perspective view of a comparative example of the conventional product. 16, 24... Tsubabe, 18, 25...
Cylindrical part, 19, 26......Finding ring band of woven wire mesh. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9

Claims (1)

[Claims] 1. The part below the middle of the knitted knitted wire mesh is compressed to form a flange, the part above the middle is compressed to form a cylindrical part, the flange has a higher density than the cylindrical part, and the connecting part between the two is made of flexible material. A honeycomb supporting cushion body for exhaust gas purification, which is made of a knitted wire mesh annular band of a constant width.