Core piece for exhaust gas catalyst device, method of producing the same, and method of installing and fixing the same

Abstract

A novel core piece for an exhaust gas catalyst device capable of realizing further reduction in weight, costs, etc. that are constantly demanded for automobile related components, a method of producing the core piece, and a method of inserting and fixing the core piece. A core piece (3) for an exhaust gas catalyst device (1), provided inside an outer tube body (2) into which an exhaust gas (G) issent and purifying the exhaust gas (G) by a catalyst adhered and formed on the surface of the core piece (3), wherein the core piece (3) is attached to the outer tube body (2) by at least either a method where the core piece (3) is formed so as to return elastically in the outer peripheral direction when the core piece (3) is deformed in the inner peripheral direction in attaching the core piece (3) to the outer tube body (2), and the core piece (3) is attached to the outer tube body (2) by spring elasticity of the core piece (3) itself, or a method where an appropriate portion of the outer tube (2), into which the core piece (3) is inserted, is reduced in diameter to attach the core piece (3) to the outer tube body (2).

Description

technical field [0001] The present invention relates to a device for purifying combustion gas exhausted from various internal combustion engines, and in particular to a core member provided inside an outer cylinder body and firmly installed in the outer cylinder body in a close-fit state, its manufacturing method and Its plug-in fixing method. Background technique [0002] Generally speaking, in an engine that obtains mechanical power by explosively burning oil in a pressure cylinder, the exhaust gas contains CO (carbon monoxide), HC (hydrocarbon), NO x (nitrogen oxides) and other harmful substances, so a catalyst device (purification device) that reduces such harmful substances is installed in the exhaust gas discharge path such as a muffler or an exhaust pipe. [0003] As such catalyst devices, there are, for example, Figure 14 (a) As shown in the integral type device, the core 3' having a honeycomb cross-section is embedded in the outer cylinder 2'. This device is to ma...

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Problems solved by technology

That is, in the manufacture of the above Figure 14 (a) In the case of the core member 3', the desired core member 3' is obtained by stacking metal plates such as a flat plate and a corrugated plate, and then rolling them into a spiral shape until reaching an appropriate size. However, by using such a method, Even if only the core member 3' is manufactured, many components are required, and the number of steps tends to increase due to the large number of components, which leads to an increase in cost or weight of the exhaust catalyst device 1'.

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