Abstract: The invention provides a metal honeycomb core body used as the principal structural element of an exhaust gas cleaning unit excellent in various performances and economy that is provided with a corrugated band member, that is a structural member of a metal honeycomb core body having a special waveform structure. The invention provides a metal honeycomb core body having honeycomb structure fabricated by bringing corrugated band members (1) and planar band members (2) made of thin-walled metal sheet alternately into contact. The corrugated band member (1) has a waveform structure obtained by using a waveform of an imaginary corrugated sheet (1′) having crests and troughs which are in contact with a planar band member (2) and composed of a connected waveform having a desired waveheight (h) and one period length (&lgr;′).

Abstract: The invention provides a metal honeycomb core body used as the principal structural element of an exhaust gas cleaning unit excellent in various performance and economy which is provided with a corrugated band member, that is a structural member of a metal honeycomb core body, having the special waveform structure.

Abstract: An exhaust gas cleaning device is constructed of a metal casing and a honeycomb core body fixedly inserted in the metal casing. The honeycomb core body have been formed by superposing a planar band made of a metal sheet and a corrugated band made from another metal sheet one over the other in a contiguous relation, defines a number of network-patterned axial gas flow passages, and is adapted to carry an exhaust gas cleaning catalyst thereon. The metal casing defines a cavity compartment isolated from an exterior. Preferably, at least one rib or partition wall is arranged in the cavity compartment of the metal casing.

Abstract: A metal-made honeycomb carrier body is provided for carrying thereon an exhaust gas cleaning catalyst. The carrier body has been formed by superposing a planar metal band made of a metal sheet and a corrugated band made from another metal sheet one over the other in a contiguous relation and defines a number of network-patterned gas flow passages along a central axis thereof. At one of opposite axial ends of the honeycomb carrier body, one of the planar band and the corrugated band extends outwardly relative to the other band.

Abstract: An exhaust gas cleaning apparatus comprises one or more honeycomb core bodies for carrying an exhaust gas cleaning catalyst and fitted in a tubular metal casing. The metal casing has an outer wall which is axially expandable and contractible so as to follow the stress due to thermal strains acting on the honeycomb core bodies inside, thereby remarkably improving the apparatus in durability and vibration resistance.

Abstract: A metal-made carrier body, for carrying thereon an exhaust gas cleaning catalyst, is in the form of a multi-layered composite body composed of at least sheet-like metal band and a corrugated metal band. The corrugated band has ridges and inter-ridge grooves, both in contact with the sheet-like band. The shape of the corrugated band is such that a unit part of the corrugated band between each of the ridges and an individual one of the grooves contiguous thereto is longer than a virtual sine curve.

Abstract: A metal-made carrier body, for carrying thereon an exhaust gas cleaning catalyst, comprises a multi-layered composite body in a spirally rolled form composed of a sheet-like band and a corrugated band, the multi-layered composite body being enclosed in and fixed to a tubular metal casing. The metal casing is composed of an outer casing, and at least one inner casing disposed in the outer casing, thus giving excellent durability to the carrier body.

Abstract: An exhaust gas cleaning device for a motor vehicle is constructed of a honeycomb core body formed by superposing a planar band made of a metal sheet and a corrugated band made from another metal sheet one over the other in a contiguous relationship and then rolling the thus-superposed bands into a multi-layered spiral form with at least one outermost layer thereof being formed of the planar band. The honeycomb core body defines a number of network-patterned axial gas flow passages and is adapted to carry an exhaust gas cleaning catalyst. At least one fin is fixed on an outer peripheral wall of the honeycomb core body.

Abstract: An exhaust gas cleaning device is constructed of a honeycomb core body. The honeycomb core body has been formed by superposing a planar band made of a metal sheet and a corrugated band made from another metal sheet one over the other in a contiguous relationship and then rolling the thus-superposed bands into a multi-layered spiral form. The honeycomb core body defines a number of network-patterned axial gas flow passages and is adapted to carry an exhaust gas cleaning catalyst. The honeycomb core body is divided into a central honeycomb core section of a smaller diameter and an outer honeycomb core section of a larger diameter. A separator is interposed between an outer peripheral wall of the central honeycomb core section and an inner peripheral wall of the outer honeycomb core section. The outer honeycomb core section may be divided further into plural honeycomb core sub-sections having different diameters and a additional separator may be interposed between each two adjacent core sub-sections.

Abstract: An exhaust gas cleaning device is constructed of a honeycomb core body formed by superposing in a contiguous relation a planar band made of a metal sheet and a corrugated band made from another metal sheet one over the other. The honeycomb core body defines a number of network-patterned axial gas flow passages and is adapted to carry an exhaust gas cleaning catalyst thereon. The planar band has alternating rugged sections and flat sections of desired lengths.

Abstract: In an exhaust gas cleaning apparatus, at least two honeycomb core bodies each as an exhaust gas cleaning catalyst are arranged, with at least one axial space therebetween, in a metal casing. Each core body is composed of a sheet-like band and a corrugated band. The outer peripheral surfaces of the core bodies are fixed to the inner surface of the casing so that each core body is expandable and contractible axially. The axial space effectively absorbs and relaxes the stress due to large thermal strains acting on the individual core bodies, thus causing an improved durability.

Abstract: A nickel coating and an aluminum layer are formed in this order on an inexpensive thin steel sheet made of a low-carbon steel, a low-chromium steel or a low-nickel steel. Then the nickel- and aluminum-plated thin steel sheet is subjected to a diffusion penetration treatment to form a mutually diffused layer over the entire surface of the thin steel sheet, thus providing a thin steel band which is excellent in heat-resistance, corrosion-proofness at high temperature and rigidity.

Abstract: An exhaust gas cleaning device is constructed of a honeycomb core body. The honeycomb core body is formed by superposing a planar band made of a metal sheet and a corrugated band made from another metal sheet, one over the other in a contiguous relationship, and then rolling the thus-superposed planar band and corrugated band together into a multilayered spiral form, defines a number of network-patterned axial gas flow passages, and is further processed to carry an exhaust gas cleaning catalyst thereon. The honeycomb core body defines, along the central axis of rolling thereof, an open cylindrical hollow space of a diameter .phi..sub.2 satisfying the following formula: ##EQU1## wherein .phi..sub.1 is the outer diameter of the honeycomb core body, and.phi..sub.2 is the outer diameter of the cylindrical hollow space.In other aspects of the invention, reinforcing cylinders or ribs are disposed to strengthen the overall structure.

Abstract: In an exhaust gas cleaning apparatus, at least two honeycomb core bodies each carrying a cleaning catalyst are arranged, with at least one axial space therebetween, in a metal casing having an enlarged-diameter portion. The outer peripheral surfaces of the core bodies are fixed to the inner surface of the casing so that each core body is expandable and contractible axially. The result is that separation between each core body and the casing can be prevented, thus improving the durability. Further, an excellent cleaning performance can be achieved not only due to the heat insulating effect as well as the gas stirring effect by the enlarged-diameter casing portion, but also due to the gas turbulent effect by the inter-body space.

Abstract: An exhaust gas cleaning device for a motor vehicle is constructed of a metal casing open at both ends thereof and a honeycomb core body fixedly enclosed within the metal casing. The honeycomb core body has been formed by superposing a planar band made of a metal sheet and a corrugated band made from another metal sheet one over the other in a contiguous relationship. The honeycomb core body defines a number of network-patterned axial gas flow passages and is adapted to carry an exhaust gas cleaning catalyst. At least one fin is fixed on an outer peripheral wall of the metal casing.

Abstract: A metal-made carrier body, for carrying thereon an exhaust gas cleaning catalyst, comprises a honeycomb core structure composed of a sheet-like metal band and a corrugated metal band. As each of the metal bands, an inexpensive thin steel band which is plated with nickel and then with an aluminum coating and further processed by diffusive penetration treatment, is used. The metal-made carrier body is inexpensive and is excellently heat-resistant and corrosion-proof.

Abstract: A metal-made carrier body, for carrying thereon an exhaust gas cleaning catalyst, comprises a metal casing, and a multi-layered composite structure or honeycomb core structure composed of a sheet-like metal band and a corrugated metal band and enclosed in the tubular metal casing and joined therewith. The inner wall of the casing is provided with fine recesses for promoting the penetration of a brazing material. Because of the fine recesses, it is possible to join the honeycomb core structure and the casing together with adequate firmness, thus making the carrier body excellently durable.

Abstract: An exhaust gas cleaning apparatus comprises a honeycomb core body adapted for carrying an exhaust gas cleaning catalyst and fitted in a tubular metal casing. The carrier body is formed by rolling or laminating a sheet-like band and a corrugated band together. The carrier body has a recess in its outer peripheral surface so that the outer peripheral surface is kept out of contact with an inner surface of the casing. This recess effectively absorbs or relaxes the stress due to large thermal strains acting between the outer peripheral surface of the carrier body and the inner surface of the casing.

Abstract: A metal-made carrier body is provided for carrying thereon an exhaust gas cleaning catalyst. The carrier body is formed by superposing a sheet-like metal band made of a thin metal sheet and a corrugated band made from another thin metal sheet one over the other in a contiguous relation into a multi-layered composite body defining many network-patterned gas flow passages along a central axis thereof and then enclosing the multi-layered composite body within a cylindrical metal casing. The cylindrical metal casing has a double-layer structure composed of an inner portion made of a metal material having a coefficient of thermal expansion similar to that of the constituent members of the multi-layered composite body and an outer portion made of another metal material having greater heat- and corrosion-resistance than the metal material of the inner portion.

Abstract: A metal-made carrier body, for carrying thereon an exhaust gas cleaning catalyst, comprises a metal casing, and a multi-layered composite structure or honeycomb core structure composed of a sheet-like metal band and a corrugated metal band and enclosed in the tubular metal casing and joined therewith. The inner wall of the casing is provided with brazing-material-holding grooves. Because of the brazing-material-holding grooves, it is possible to join the honeycomb core structure and the casing together with adequate firmness, thus making the carrier body excellently durable.