Abstract: An exhaust silencing device connected to an exhaust system of an engine is provided in which two outlet pipes that have at an upstream end thereof an opening portion opening within the silencer main body and that discharge exhaust gas within the silencer main body to an outside thereof are disposed within the silencer main body along a bottom thereof so that the distances thereof from the lowest part of the bottom are substantially equal, and the opening portion of one outlet pipe is directed further toward the bottom of the silencer main body than is the opening portion of the other outlet pipe. Such exhaust silencing device efficiently discharges to the outside the condensed water building up within the silencer main body so as not to impair an effect in reducing exhaust resistance by providing two outlet pipes that guide the exhaust gas to the outside.

Abstract: In a fluid transmitting device with a lock-up clutch, each second transmitting claw is formed of: a base portion having a long side arranged in a peripheral direction of a turbine impeller and a short side arranged axially of the turbine impeller; and a claw portion protruding from an intermediate portion of one of long-side portions of the base portion and being inserted between adjacent damper springs, and each short-side portion of the base portion is fixed to the turbine impeller through a weld. A long-side portion of the base portion not welded to the turbine impeller includes a cutout, facilitating bend of the long-side portion when transmitting torque through the second transmitting claw, at opposite sides of the claw portion. This improves engine output performance by relaxing stress concentration at spots where the second claws are welded to a turbine impeller without increasing the thicknesses of the claws.

Abstract: Among first and second stators of a torque converter supported on a fixed part by a one-way clutch corresponding to the stators, the number of second stator blades of the second stator on the downstream side in the direction of flow of oil is larger than the number of first blades of the first stator on the upstream side, and the maximum value t2 for blade thickness of the second stator blade is smaller than the minimum value t1 for blade thickness of the first stator blade. Therefore, it is possible to ensure that there is a sufficient gap (?) between a trailing edge of the first stator blade and a leading edge of the second stator blade, thus preventing the flow of oil from being stopped by the gap (?), and it is possible to align effectively the flow of oil by means of the second stator blades.

Abstract: A chucking device for use when an outer peripheral end part of a semi-finished product having a pillar-shaped catalyst wrapped in a mat and housed in a cylinder is spin-processed using a plurality of spinning rollers. An outer peripheral surface of the semi-finished product is chucked using a plurality of pressing pieces. Each of the pressing pieces has a contact surface for touching the cylinder of the semi-finished product, and a pair of chamfers extending radially outward from either end of the contact surface.

Abstract: A heat exchange tube is constructed by forming, on a cylindrical tube peripheral wall, a plurality of projecting portions which project to an inside of the tube peripheral wall, and which are formed by pushing. The plurality of projecting portions are formed, respectively, into conical shapes across a tube axis, and are arranged along virtual spirals on the tube peripheral wall. Accordingly, it is possible to provide a heat exchange tube which facilitates formation of a plurality of projecting portions with the thickness hardly changed and without formation of protruded portions, and which is capable of contributing to enhancement of heat exchanging efficiency.

Abstract: A flywheel device includes a mass-side rotor including a mass ring and a pair of holder plates connected to both sides of the mass ring. The mass-side rotor is connected to a crankshaft with a drive plate therebetween. Between the mass-side rotor and the drive plate, a positioning apparatus for positioning those coaxially with each other is provided. The positioning apparatus includes: an annular positioning protrusion which is press formed in at least one of the pair of holder plates to project laterally outward therefrom, and which is disposed coaxially with the mass-side rotor; and a positioning recessed portion which is press formed in the drive plate coaxially with the crankshaft, and which is fitted to the positioning protrusion. Accordingly, it is possible to enable coaxial positioning of the mass-side rotor and the drive plate without performing burdensome machining on the mass ring for forming a positioning apparatus.

Abstract: In a method of manufacturing a brake disc having an outer peripheral shape of projections-recesses repetition in which a radial projection and a radial recess are alternately repeated in the circumferential direction of the brake disc, there is provided a method in which a curved face portion can be formed uniformly over the entire outer peripheral edge portion of the disc main body so as to eliminate the step of chamfering for removing burrs and which is superior in productivity. A disc main body whose outer peripheral shape is projections-recesses repetition is half-blanked from one of plate thickness directions of a sheet material. Thereafter, the disc main body is blanked from the other of the plate thickness directions of the sheet material W.

Abstract: A floating type brake disc is provided which is capable of limiting the heat escape from a rotor to a hub to the extent possible and which can be made smaller in weight. In a plurality of circumferential positions of the hub, there are formed pin-receiving portions in a manner to enclose a connecting pin from three directions of a radially inward, one of circumferentially both sides and a radially outward of the brake disc. A tongue-shaped pin-receiving portion is formed on each of a plurality of inner circumferential positions of the rotor 1 so as to be elongated radially inward to pinch the connecting pin between the tongue-shaped pin-receiving portion and the pin-receiving portion that is formed in the hub.

Abstract: In a manufacturing method of an impeller for a fluid transmitting device, multiple guide grooves aligned in a peripheral direction to allow communication between adjacent ones of multiple positioning holes are provided in a concave inner surface of a core in advance; and in a step of melting a brazing material and causing the molten brazing material to penetrate into gaps between coupling pieces and positioning holes that are fitted to each other and further into gaps between the core and the blades, the molten brazing material is guided to the positioning holes through the multiple guide grooves. Accordingly, the step allows the molten brazing material to be efficiently guided to the gaps between the coupling pieces and positioning holes, thereby improving the yield of the brazing material and preventing an influence of a residual brazing material over the rotational balance of the impeller.

Abstract: In a fluid transmitting device with a lock-up clutch, each second transmitting claw is formed of: a base portion having a long side arranged in a peripheral direction of a turbine impeller and a short side arranged axially of the turbine impeller; and a claw portion protruding from an intermediate portion of one of long-side portions of the base portion and being inserted between adjacent damper springs, and each short-side portion of the base portion is fixed to the turbine impeller through a weld. A long-side portion of the base portion not welded to the turbine impeller includes a cutout, facilitating bend of the long-side portion when transmitting torque through the second transmitting claw, at opposite sides of the claw portion. This improves engine output performance by relaxing stress concentration at spots where the second claws are welded to a turbine impeller without increasing the thicknesses of the claws.

Abstract: An exhaust flow control valve includes: a valve plate hinged to a downstream exhaust pipe to be pivotable, inside the pipe, between a fully closed position where a short-cut hole is closed and a fully open position where the short-cut hole is opened, the valve plate having a tip end directed toward a downstream side of the downstream exhaust pipe when at the fully open position; a spring receiving member provided to the downstream exhaust pipe to traverse the short-cut hole; and a valve spring having one end portion fastened to a tip end portion, which is located on the downstream side of the downstream exhaust pipe with respect to the spring receiving member, of the valve plate, and having an opposite end side being slidably in pressure contact with the spring receiving member, thereby generating a repulsive force to bias the valve plate toward the fully closed position.

Abstract: An exhaust flow control valve includes: a valve plate hinged to a downstream exhaust pipe to be pivotable, inside the pipe, between a fully closed position where a short-cut hole is closed and a fully open position where the short-cut hole is opened, the valve plate having a tip end directed toward a downstream side of the downstream exhaust pipe when at the fully open position; a spring receiving member provided to the downstream exhaust pipe to traverse the short-cut hole; and a valve spring having one end portion fastened to a tip end portion, which is located on the downstream side of the downstream exhaust pipe with respect to the spring receiving member, of the valve plate, and having an opposite end side being slidably in pressure contact with the spring receiving member, thereby generating a repulsive force to bias the valve plate toward the fully closed position.

Abstract: A metallic bellows is manufactured by a first step of bulging a straight raw pipe into a primary formed body having formed on a periphery thereof a corrugated bellows section, and a second step of subjecting at least one of crest portions and trough portions of the bellows section of the primary formed body to roll machining by means of a pair of forming rolls.

Abstract: A flywheel device includes a mass-side rotor including a mass ring and a pair of holder plates connected to both sides of the mass ring. The mass-side rotor is connected to a crankshaft with a drive plate therebetween. Between the mass-side rotor and the drive plate, a positioning apparatus for positioning those coaxially with each other is provided. The positioning apparatus includes: an annular positioning protrusion which is press formed in at least one of the pair of holder plates to project laterally outward therefrom, and which is disposed coaxially with the mass-side rotor; and a positioning recessed portion which is press formed in the drive plate coaxially with the crankshaft, and which is fitted to the positioning protrusion. Accordingly, it is possible to enable coaxial positioning of the mass-side rotor and the drive plate without performing burdensome machining on the mass ring for forming a positioning apparatus.

Abstract: A lightweight exhaust component cover having a small number of components is disclosed. In the exhaust component cover, an internal plate is formed by bending part of a single plate at both ends, and the internal plate is joined to the inside surface of an external plate.

Abstract: A press forming apparatus comprises an upper die provided with an upper drawing die, a punch, an upper movable blank holder, and a trimming member and a lower die provided with a lower drawing die, a die, an outer periphery drawing die, and a lower movable blank holder. The upper die is lowered with respect to the lower dye, and the outer periphery portion of a blank is held by the trimming member and the upper blank holder. The central portion of the blank is drawn by the upper and lower drawing dies. The outer periphery portion of the blank is trimmed by the trimming member and the outer periphery drawing die, and drawing of the outer periphery portion of the blank is started by the upper drawing die and the outer periphery drawing die.

Abstract: A heat exchange tube is constructed by forming, on a cylindrical tube peripheral wall, a plurality of projecting portions which project to an inside of the tube peripheral wall, and which are formed by pushing. The plurality of projecting portions are formed, respectively, into conical shapes across a tube axis, and are arranged along virtual spirals on the tube peripheral wall. Accordingly, it is possible to provide a heat exchange tube which facilitates formation of a plurality of projecting portions with the thickness hardly changed and without formation of protruded portions, and which is capable of contributing to enhancement of heat exchanging efficiency.

Abstract: A floating type disc brake “A” used for a vehicle such as a motorcycle comprising a braking rotor 1A and a hub 2A arranged inside the braking rotor 1A, the braking rotor 1A including an annular rotor portion 11 and a plurality of projections 13A extending radially inward from the inner circumferential portion of the rotor portion 11, and further comprising a connecting means 3 for connecting the braking rotor 1A and the hub 2A at positions in which the projections 13A of the braking rotor 1A are abutted to the outer circumferential portion of the hub 2A. At least one of the rotor portion 11 and the projections 13A is formed with cutout portions 13b at the boundary region between the rotor portion 11 and the projections 13A. It is possible to suppress a local heat dissipation in regions of the rotor portion 11 in which the projections 13A are formed and thus to reduce irregularity of heat distribution in the rotor portion 11 during braking operations.

Abstract: An assembly for fitting together multiple exhaust pipes in a multi-cylinder engine into a single unit is provided. The assembly includes a cap and a choke pipe connected to the cap. The cap includes a surface with multiple sockets protruding from the surface in a direction opposite to the choke pipe whereby the sockets engage the exhaust pipes. The cap also includes a skirt, which surrounds a perimeter of the surface. The skirt extends from the surface in a direction toward the choke pipe. An internal surface of the sockets, an internal surface of the skirt and an internal surface of the choke pipe are linearly arranged with respect to each other.

Abstract: A lightweight exhaust component cover having a small number of components is disclosed. In the exhaust component cover, an internal plate is formed by bending part of a single plate at both ends, and the internal plate is joined to the inside surface of an external plate.