Abstract: A connecting and fitting method is provided for metallic pipes with a small diameter. The method includes providing a piping component having a tube wall extending therefrom and defining an expanded chamber. The method further includes providing a pipe member and forming at least one circumferential discontinuity in the pipe member near one end. The end of the pipe member is then inserted through an annular sealing component and into the expanded chamber defined by the tube wall. A diameter reducing area is then formed on the tube wall at a location substantially registered with the circumferential discontinuity in the pipe member to squeeze and tightly seal the sealing component into connecting engagement with the circumferential discontinuity on the pipe member.

Abstract: A honeycomb body for supporting thereon an exhaust gas cleaning catalyst has a honeycomb structure constructed of at least one planar band and at least one corrugated band. One of the planar and corrugated bands has been replaced by a wire arrangement of a desired width. The wire arrangement is formed of wires of a desired length arranged side by side in the direction of the width of the wire arrangement.

Abstract: A device for the catalytic purification of automotive exhaust gas includes at least one inner casing housing an assembly of corrugated, or corrugated and flat, thin metal sheets carrying a catalyst thereon, and disposed between a gas inlet and a gas outlet which are adapted for connection to an exhaust pipe extending from an engine. An outer casing surrounds the inner casing in a speced apart relation therefrom, and is joined to it in a gastight way. The inner and outer casings define therebetween a closed space filled with a heat storing material which can collect and store the heat of exhaust gas.

Abstract: An X-wrapped metallic honeycomb body is provided for carrying thereon an exhaust gas cleaning catalyst. The honeycomb body has been constructed using at least two stacks each of which comprises planar band(s) and corrugated band(s) made from metal sheets and alternately stacked into a desired number of layers. Each of the stacks has a notched fitting portion so that the stacks are mutually fitted together at the notched fitting portions thereof. The stacks have been rolled in the same direction about the notched fitting portions thereof as a central axis of the rolling formation.

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 cylinder manufacturing process including the steps of: pressing an annular member of steel onto the outer circumference of one end of a cylindrical tube, which is made of steel and cut to a desired length in advance, and soldering it with a metal solder to form a flange wall; inserting the cylindrical tube portion into that portion of a mold, which has an internal diameter slightly larger than the external diameter of the tube; pressing the tube radially, while being set by fixing the flange wall, to increase the diameter of the tube with a plug which is made movable while being fitted therein and which has a slightly larger diameter than the internal diameter of the tube; and finishing the other end of the tube to product sizes.

Abstract: Herein disclosed is a flared structure which forms one open end of a metal pipe to be connected to one end of a mating joint. The flared structure has at least one deformed elastic wall portion which is formed circumferentially in the vicinity of the open end of the metal pipe. As the open end is clamped and fastened at the connecting time, the deformed elastic wall portion establishes an elastic force for ensuring a stable connection for a long time.

Abstract: A small thick-walled composite metal fuel injection tubing for a diesel engine, for example, is manufactured from an outer carbon steel pipe, and an inner stainless steel pipe press-fitted in the large diameter carbon steel pipe by drawing. The press-fitted mating surfaces of the inner and outer pipes are metallurgically and integrally bonded together by heat-treating. As a result, at least an inside wall surface of the inner stainless steel pipe has a diffused layer of at least one kind of metal, or an alloy of two or more kinds ,of metals in combination, selected from the group consisting of Ni, Cr, Mo, Co, Al and Cu.

Abstract: A steel product (or copper-plated steel product) with heat-resistant, corrosion-resistant plating layers which are composed of a 0.2-10 .mu.m thick nickel plating layer formed on said steel product, a zinc plating layer formed on said nickel plating layer, and a chromate film formed on said zinc plating layer.

Abstract: A metal-made honeycomb body, which is an important component of an exhaust gas cleaning device, is composed of at least one heat-resistant, planar band and at least one heat-resistant, corrugated band. Of these bands, each corrugated band has, on at least a part of a surface thereof, a surface-roughened area defining a number of minute pits.

Abstract: A connector device for connecting a small diameter pipe is disclosed. The device has a joint body internally formed with a communication bore, first and second pipes intruded into end parts of the joint body, a socket member having elastic pawl walls each impinging on an annular swelling, and sealing members internally provided. The second pipe is movable a given distance in the axial core direction.

Abstract: A multi-walled steel pipe comprises a metal strip plated with copper and including a brazing layer thereon. At least one surface of the metal strip is roughened and braze welded to the other, overlapping surface when the metal strip is rolled. The roughened surface has a roughness in the range of between 10 and 30.mu.m. A method of making a multi-walled steel pipe comprises roughening at least one surface of a metal strip, the metal strip being previously plated with copper and including a brazing layer thereon, rolling the metal strip a plurality of times by a pipe forming machine to provide a pipe body with the roughened surface directed toward the other overlapping surface, while the metal strip being fed between a plurality of sets of rollers in the pipe forming machine, and heating the pipe body to a melting temperature of the brazing layer in a furnace so as to braze weld the overlapping surfaces of the metal strip together.

Abstract: There is disclosed a compact and durable connector for connecting a thin tube or pipe which is used as a passage for supplying oil or air to an automobile or machine and whose diameter is less than about 20 mm. The tube has an outwardly swelling annular wall. The connector comprises a connector body and a socket body. The body has a connecting cylindrical wall at its front end. The cylindrical wall has a communication hole. A stepped enlarged chamber is formed in the body. At least one annular seal member is mounted in the chamber. The socket member comprises a cylindrical member pushing the seal member, engaging support claw walls protruding forward, and an inclined cylindrical wall spreading forward. When the tube is connected, the engaging support claw walls engage with the swelling annular wall of the tube.

Abstract: A steel eyejoint for receiving the end of a pipe and attaching itself to a frame is made of a pair of half members. Each half member consists of a flat head section formed with an attaching hole and a tail section extending from the head section. The head section has an annular flow path defined thereinside which is in communication with the attaching hole and with the inside of the tail section. An opening edge of one half member is partly overlapped with that of the other. The two half members are brazed together along the overlap line between the opening edges.

Abstract: A joint for coupling small-diameter pipes comprises a body. The body includes a cylindrical joint wall defining a bore and a continuous cylindrical wall defining a stepped enlarged chamber in communication with the bore. The cylindrical wall includes a plurality of rearwardly extending holder walls having pawls. The enlarged chamber is configured to receive a seal and a bushing. A support includes a central hole, and a plurality of holes in surrounding relation to the central hole. When a pipe extends through the central hole, the peripheral wall of the central hole is engaged with an annular projection wall formed adjacent one end of the pipe, and the pawls are engaged with the holes of the support. The support may be in the form of a disk or in the form of a flanged cylindrical member.

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: This invention provides a high pressure metallic pipe having at least one end thereof provided with a connecting head suitable for connection to a counter seat part and a method for shaping the connecting head. The high pressure metallic pipe according to this invention features a metallic ring embedded in a cavity formed therein at the time of buckling so that no cavity erosion due to the high pressure fluid flowing through the pipe takes place. Further, according to the method of this invention, one end of the thick metallic pipe, having a comparatively small outer diameter, is expanded by buckling, a metallic ring is inserted into the extended pipe end and the pipe end is pressed by a punch to form a connecting head with the metallic ring embedded therein.

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: A small-size piping coupling joint, comprising a retainer member with a piping insertion hole perforated in a shaft center portion of a bottom wall and a plurality of locking claw walls projecting uniformly as tapered toward a rear side provided on a peripheral side wall portion, and a socket member provided with a flow hole in the shaft center portion ranging to a stepped expanded portion inside of an end portion on a coupling side, and having an engaging groove on an outer circumferential wall portion. With an outward swelling wall having a seal ring on the back positioned within the stepped expanded portion, the retainer member and the socket member are locked overlapping each other to connection, thus the locking claw walls are locked resiliently in the engaging groove on the socket member side to coupling of the piping.