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: 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: 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: An engine-cooling fan is made of a synthetic resin, and includes a cylindrical hub, a plurality of fan blades provided integrally and radially on an outer peripheral wall of the hub and an integral member provided on an inner peripheral wall of the hub for mounting the fan on a drive shaft extending at a right angle relative to a plane in which the fan blades lie. At least one reinforcing rib is integrally molded between the outer peripheral wall of the hub and a heel portion of each of the blades.

Abstract: A metal-made carrier body is fabricated for an exhaust gas cleaning catalyst. At least one sheet-like metal band and at least one corrugated metal band, each of said bands being made of a thin metal sheet, are superposed one over the other so as to establish contacts therebetween, thereby forming a multi-layered composite body defining a number of network-patterned gas flow passages along the central axis thereof. The composite body is dipped in an electroless plating bath capable of forming a brazing coating layer on the composite body so as to form a brazing coating layer at least in the vicinity of each contact except for the contact itself. The composite body is then subjected to a heat treatment so as to braze the contacts between the sheet-like metal band and corrugated metal band. Before dipping the composite body in the plating bath, it may optionally be enclosed in a cylindrical metal casing. The composite body and cylindrical metal casing are also brazed together at their mutual contacts.

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: 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: Disclosed herein is an exhaust gas cleaning device which is suitable for arrangement at an intermediate point in an exhaust gas system of an automotive vehicle and has good efficiency. The exhaust gas cleaning device includes a metal-made carrier body for an exhaust gas cleaning catalyst. The carrier body is composed of a multi-layered composite body by superposing one over the other at least one planar metal band made of a thin metal sheet and at least one corrugated metal band made of another thin metal sheet and defining many network-patterned gas flow passages along a central axis thereof to allow an exhaust gas to axially flow as streams through the gas flow passages. At least one of the bands defines many holes and many raised portions, preferably, ridges around or near the respective holes. As an alternative, at least one of the bands is made of a metal wire net.

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.

Abstract: A supercharged internal combustion engine arrangement comprising an internal combustion engine having a plurality of turbo-chargers arranged to charge air into the engine and mechanism responsive to an operating condition of the engine for disabling at least one of the turbo-chargers, the arrangement being such that at low speeds all the turbo-chargers are used, and that as the speed rises the at least one turbo-charger is gradually disabled, thereby to improve the responsiveness of the engine.

Abstract: A fluoroplastic coating is formed on the surface of a substrate, which is selected from the group consisting of zinc, zinc alloys and zinc platings, by (i) forming an anodic oxide film on the surface of the substrate by alternating current electrolysis, (ii) dipping the substrate with the anodic oxide film formed therein in a dispersion of a fluoroplastic to coat the anodic oxide film with the fluoroplastic; and (iii) subjecting the thus-coated substrate to a heat treatment at a temperature of at least 170.degree. C.

Abstract: A slide type exhaust brake having an exhaust pressure regulating passage provided in that portion of the wall of a housing which defines the bottom of a guide passage for a reciprocating valve member such that the exhaust pressure regulating passage extends from the surface of the bottom wall to an exhaust gas flow passage at the downstream side of the valve member when disposed to close the flow passage. The inlet of the exhaust pressure regulating passage is opened or closed by an exhaust pressure regulating valve provided at the distal end of a piston rod of an air cylinder, the piston rod having the valve member movably engaged therewith, in response to the operation of the valve member for opening or closing the flow passage.

Abstract: A structure comprising two interconnected metal tubes used for supplying oil or air. The first tube inserted in the second tube has a tubular wall at its one end and an outwardly swelling circumferential wall formed inside the tubular wall. The second tube has plural slots arranged circumferentially. A seal member is sandwiched between both tubes. A binding band is wound around the slots to compress the portion having the slots, for fastening the tubes together.

Abstract: A composite tube having a small diameter consists of a thin metal tube having a small diameter and a resin tube closely fitted on the outer periphery of the metal tube. The connecting end portion of the composite tube has a coaxial and outwardly opening flare which is formed integrally with the composite tube. A metal sleeve washer having substantially the same shape as that of the composite tube with the flare is fitted on the outer periphery of the composite tube.

Abstract: Each blade (2) of a propeller fan projecting radially outwardly from the outer peripheral surface of an annular boss (1) has on at least part of its suction side (3), a coarsened surface (4).

Abstract: Each blade of a low speed propeller fan extended radially outwardly from a member connected a rotating body has a coarsened surface at least part of its suction side. The coarsened surface has a coarsened density or depth which gradually increases from the front edge of the blade to its rear edge.

Abstract: A method for manufacturing a metallic carrier base material of multi-layer structure, if desired accommodated in a cylindrical case, for maintaining a catalyst for exhaust gas purification, wherein a multi-layer body having a number of screen-like vent holes in an axial direction is formed by piling up alternatively the planar band material and corrugate band material made of thin steel strip, to furnish the contact portion, if desired, after inserting the multi-layer body into a cylindrical case. The multi-layer body or thus obtained composite is then treated by immersion processing in a molten aluminum bath.

Abstract: A metal-made carrier body is provided for an exhaust gas cleaning catalyst. The carrier body includes a cylindrical metal casing and a metal-made multi-layered composite body. The composite body has been obtained by superposing one over the ther at least one planar metal band made of a thin metal sheet and at least one corrugated metal band made of another thin metal sheet and then rolling both the bands together into a spiral form, so that the composite body defines many network-patterned gas flow passages along the central axis thereof. The composite body is enclosed within the metal casing. A gas-permeable insert is centrally and axially embedded within the multi-layered composite body of the planar metal band and the corrugated metal band.