Stock material or miscellaneous articles – All metal or with adjacent metals – Honeycomb – or with grain orientation or elongated elements...
Patent
1997-06-02
1998-12-29
Thibodeau, Paul J.
Stock material or miscellaneous articles
All metal or with adjacent metals
Honeycomb, or with grain orientation or elongated elements...
428594, 428603, 428604, 428595, 502439, 502527, B21D 3900, B23B 1500, B21C 3700, B01J 2104
Patent
active
058539026
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a metal honeycomb core body having honeycomb structure that is the principal structural element of an exhaust gas cleaning metal carrier which is generally installed at an intermediate point of an exhaust system of a motor vehicle and used as a cleaning means of exhaust gas.
More particularly, this invention relates to a new structure of the above-mentioned metal honeycomb core body for a metal carrier for exhaust gas cleaning comprising a metal honeycomb comprising honeycomb structure for carrying exhaust gas cleaning catalyst and a metal-made casing for containing the metal honeycomb core body.
2. Description of Related Art
A conventional metal carrier for exhaust gas cleaning comprises a metal-made metal honeycomb core body for carrying exhaust gas cleaning catalyst (for example catalyst using Pt, Rh, or Pd) composed of planar band member and corrugated band member with corrugated structure (simply referred to as metal honeycomb core body) and a metal-made casing for containing and fixing the metal honeycomb core body therein (simply referred to as metal casing).
The above-mentioned metal carrier is referred to as metal support or metal substrate in the industry, and generally denoted by the abbreviation MS. In the description of the present invention, the above-mentioned abbreviation MS will be used.
Metal honeycomb core body is denoted by H in connection with the discussion of the embodiments of the invention while (H') is used in connection with the discussion of the conventional prior art arrangements. For convenience, both denotations are used in FIG. 1 which shows a configuration generally common to both.
For a metal-made casing, an abbreviation (C) is used in association with casing.
Various honeycomb structures have been proposed as the metal honeycomb core body (H') which is the principal element of the above-mentioned metal support (MS).
For example, a metal honeycomb core body having honeycomb structure (H) shown in FIG. 2, which will be described hereinafter for description of the present invention, is a metal honeycomb core body which is referred as rolling type.
As described hereinafter, a rolling type metal honeycomb core body (H) in accordance with the present invention is quite different from the conventional metal honeycomb core body (H') having the same structure (rolling type) in quality.
However, a metal honeycomb core body (H) of the present invention relates to a new improvement of various metal honeycomb core bodies (H') which have been proposed in the past including the above-mentioned conventional rolling type metal honeycomb core body. In the context of metal honeycomb core body improvement, these various metal honeycomb core bodies (H') which have been proposed in the past are outlined herein.
The above-mentioned conventional rolling type metal honeycomb core body (H') is fabricated by superposing, for example, a planar band member comprising a heat-resistant thin-walled steel sheet with a thickness of 100 .mu.m or thinner (preferably 50 .mu.m or thinner) and with a desired width on a corrugated band member formed by corrugating the above-mentioned planar band member one over the other in a contiguous relationship, and then by rolling the thus-superposed band members together to form a metal honeycomb core body (H') having honeycomb structure comprising a number of network-patterned axial vent holes (cells) for exhaust gas passages.
Metal honeycomb core bodies having various structures other than the above-mentioned rolling type metal honeycomb core body are known as the metal honeycomb core body proposed in the art, these metal honeycomb core bodies are different in the method for fabrication of the metal honeycomb core body from a planar band member and corrugated band member.
For example, a metal honeycomb core body of multilayered type which is formed by laying both bands alternately (refer to FIG. 18 described hereinafter) has been known. In addition, metal honeycomb core bodies of radial ty
REFERENCES:
patent: 4987034 (1991-01-01), Hitachi et al.
patent: 5045403 (1991-09-01), Maus et al.
patent: 5084361 (1992-01-01), Toyoda et al.
patent: 5270095 (1993-12-01), Ito et al.
Rickman Holly C.
Thibodeau Paul J.
Usui Kokusai Sangyo Kaisha Ltd.
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