Abstract: A steel material that has on its surface a non-hexavalent-chromium type corrosion-resistant coating film formed by a composite of a metal layer and a resin layer. The steel material having or not having a copper layer is formed with 1) a Zn and/or Zn-based alloy layer, 2) a Zn/Ni alloy layer which is on this Zn and/or Zn-based alloy layer, 3) a de-Zn layer which is on the Zn/Ni alloy layer and is obtained by chemically treating the surface of the Zn/Ni alloy layer, and 4) at least one resin covering layer which is on this de-Zn layer, which are successively formed to make a corrosion-resistant coating film, the corrosion-resistant coating film, which is superior in adhesion between the metal layer and resin layer, being obtained by way of taking into account the use of a trivalent chromium type chromate layer instead of a hexavalent chromium type chromate layer (which is a substance that places a burden on the environment).

Abstract: A supercharging system for an internal combustion engine includes an exhaust introduction passage for introducing exhaust gas from an internal combustion engine; an exhaust discharge passage for introducing the exhaust gas from the exhaust introduction passage and exhausting the exhaust gas to an exterior; a mixture part arranged between the exhaust introduction passage and the exhaust discharge passage, for changing internal pressure into negative pressure upon accelerating flowing velocity of the exhaust gas with a narrowed flowing passage set to have a smaller diameter than the exhaust introduction pipe; an absorption passage for mixing outside air and the exhaust gas inside the mixture part upon introducing the outside air with use of negative pressure into an inside of the mixture part; and an intake passage for taking out and returning a part of mixed gas mixed inside the mixture part to a side of the internal combustion engine.

Abstract: An oil-through type push rod for, for instance, internal combustion engines including a metal pipe and a metal end fitting which has an oil hole formed therein and is welded to the end of the metal pipe, the metal pipe being provided with a covering layer of a low-melting-point metal for fixing a welding spatter generated during welding, and such a low-melting-point metal covering layer being disposed on at least an inside wall surface of the metal pipe so as to be near an area where the metal end fitting is welded.

Abstract: An oil-through type push rod for, for instance, internal combustion engines including a metal pipe and a metal end fitting which has an oil hole formed therein and is welded to the end of the metal pipe, the metal pipe being provided with a covering layer of a low-melting-point metal for fixing a welding spatter generated during welding, and such a low-melting-point metal covering layer being disposed on at least an inside wall surface of the metal pipe so as to be near an area where the metal end fitting is welded

Abstract: A plastic fan is composed of a plastic-made fan portion and a metal-made insert portion integrally embedded in the plastic-made fan portion. The fan portion is formed of fan blades and a fan boss. The insert portion is formed of a ring-shaped flat base portion and a bent portion extending upright from an outer peripheral edge of the base portion and having a substantially ring-shaped configuration in plan and a flattened U-shaped configuration in cross-section. The insert portion defines lock holes arranged at predetermined intervals in an outer peripheral portion of the metal-made insert portion and extending through the metal-made insert portion from an outer side thereof to an inner side thereof. The inner peripheral edge portion of each of the lock holes is formed of a smooth flat surface on at least one of the outer side and the inner side of the metal-made insert portion.

Abstract: An exhaust gas cleaning metallic honeycomb body for supporting thereon an exhaust gas cleaning catalyst is described. The body is of a honeycomb structure formed by alternately superposing two types of corrugated bands made of metal sheets one over the other in a contiguous relation and defining a number of network-patterned gas flow passages along a central axis thereof. The two types of corrugated bands comprise:(i) a first corrugated band having a triangular waveform of the structure that substantially-equilateral triangles are continuously connected in a lengthwise direction; and(ii) a second corrugated band having a substantially a sinusoidal waveform.

Abstract: Described is an exhaust gas cleaning metallic substrate of the structure that three metallic honeycomb bodies are successively arranged within a metallic casing. Among the three metallic honeycomb bodies, (i) the metallic honeycomb bodies at front and rear positions have each been constructed by fixing a planar and corrugated bands as constituent members of said metallic honeycomb body at at least some of points of contact therebetween and also an outer peripheral wall of the metallic honeycomb body and an inner peripheral wall of the metallic casing at at least some of points of contact therebetween, and (ii) the metallic honeycomb body at a middle position has been constructed without fixing a planar and corrugated bands as constituent members of said metallic honeycomb body at points of contact therebetween and also an outer peripheral wall of the metallic honeycomb body and an inner peripheral wall of the metallic casing at points of contact therebetween.

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 method is provided for forming a tough, electrical insulating layer on a surface of a copper material. The copper material is made of copper of a copper-based alloy at least in the surface thereof. According to the method, the copper material is anodized first in an alkaline electrolyte bath of a caustic alkali to form a thin film layer of cupric oxide on the surface of the copper material, and next in an acidic electrolytic bath of a hexacyanoiron complex.

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: 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 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 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 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 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.