Abstract: A direct-current power supply includes: a plurality of semiconductor devices each of which is a multiphase converter incorporating a plurality of semiconductor switching elements and a drive circuit to drive the plurality of semiconductor switching elements; a plurality of first parasitic inductances, each of which connects a reference potential terminal of the drive circuit and output N terminals of the semiconductor switching elements, in the plurality of semiconductor devices; a smoothing capacitor; and an inverter.

Abstract: A driving-wheel bearing device includes an outer race having double-row outer raceway surfaces formed on an inner periphery thereof, a hub wheel and an inner race having a wheel attachment flange at one end thereof and double-row inner raceway surfaces on an outer periphery thereof, and double-row rolling elements interposed between the outer raceway surfaces of the outer race and the inner raceway surfaces of the hub wheel and the inner race, the hub wheel having a shaft hole into which a stem section extending from an outer joint member of a constant velocity universal joint is spline-fitted by being press-fitted, in which a plate having a molybdenum coating layer or a fluorine-resin coating layer formed thereon and having a plate thickness ranging from 0.5 mm to 2 mm is interposed between opposite surfaces of a shoulder portion of the outer joint member and an crimped portion of the hub wheel.

Abstract: A driving-wheel bearing device includes an outer race having double-row outer raceway surfaces formed on an inner periphery thereof, a hub wheel and an inner race having a wheel attachment flange at one end thereof and double-row inner raceway surfaces on an outer periphery thereof, and double-row rolling elements interposed between the outer raceway surfaces of the outer race and the inner raceway surfaces of the hub wheel and the inner race, the hub wheel having a shaft hole into which a stem section extending from an outer joint member of a constant velocity universal joint is spline-fitted by being press-fitted, in which a plate having a molybdenum coating layer or a fluorine-resin coating layer formed thereon and having a plate thickness ranging from 0.5 mm to 2 mm is interposed between opposite surfaces of a shoulder portion of the outer joint member and an crimped portion of the hub wheel.

Abstract: A driving-wheel bearing device includes an outer race having double-row outer raceway surfaces formed on an inner periphery thereof, a hub wheel and an inner race having a wheel attachment flange at one end thereof and double-row inner raceway surfaces on an outer periphery thereof, and double-row rolling elements interposed between the outer raceway surfaces of the outer race and the inner raceway surfaces of the hub wheel and the inner race, the hub wheel having a shaft hole into which a stem section extending from an outer joint member of a constant velocity universal joint is spline-fitted by being press-fitted, in which a plate having a molybdenum coating layer or a fluorine-resin coating layer formed thereon and having a plate thickness ranging from 0.5 mm to 2 mm is interposed between opposite surfaces of a shoulder portion of the outer joint member and an crimped portion of the hub wheel.

Abstract: A steel ball rolling configuration and a constant velocity universal joint have a superior oil retention effect between a surface of a steel ball and a partner rolling surface, and can form a thick oil film, improve lubrication, and extend life of the steel ball. The constant velocity universal joint includes a rolling surface and a steel ball that is lubricated by grease and rolls over the rolling surface. A surface roughness of the steel ball is roughened to become more similar to a surface roughness of a partner rolling surface. Numerous miniscule recesses roughly tens of micrometers in size are randomly disposed on the surface of the steel ball.

Abstract: A driving-wheel bearing device includes: an outer race (50) having double-row outer raceway surfaces (52, 54) formed on an inner periphery thereof; a hub wheel (10) and an inner race (20) having a wheel attachment flange (14) at one end thereof and double-row inner raceway surfaces (12, 22) on an outer periphery thereof; and double-row rolling elements (30, 40) interposed between the outer raceway surfaces (52, 54) of the outer race (50) and the inner raceway surfaces (12, 22) of the hub wheel (10) and the inner race (20), the hub wheel (10) having a shaft hole into which a stem section (66) extending from an outer joint member (62) of a constant velocity universal joint (60) is spline-fitted by being press-fitted, in which a plate (80) having a molybdenum coating layer or a fluorine-resin coating layer (81) formed thereon and having a plate thickness ranging from 0.

Abstract: The present invention provides a steel ball rolling configuration and a constant velocity universal joint that achieve a superior oil retention effect between a surface of a steel ball and a partner rolling surface, can form a thick oil film, improve lubrication, and extend life of the steel ball. The constant velocity universal joint of the present invention includes a rolling surface and a steel ball 7 that is lubricated by grease and rolls over the rolling surface. A surface roughness of the steel ball 7 is roughened to become more similar to a surface roughness of a partner rolling surface. Numerous miniscule recesses 15 roughly tens of micrometers in size are randomly disposed on the surface of the steel ball 7.

Abstract: A constant velocity universal joint which can provide an improved strength in a stem portion by simple and effective countermeasure. The constant velocity universal joint include a bowl-shaped mouth portion and an outer joint member having the stem portion with a serration formed on its outer peripheral surface. The stem portion extends from a bottom portion of the mouth portion in its axial direction as an integrated part. An induction hardened area C is formed in the bottom portion of the mouth portion.

Abstract: A constant velocity universal joint which can provide an improved strength in a stem portion by simple and effective countermeasure. The constant velocity universal joint include a bowl-shaped mouth portion and an outer joint member having the stem portion with a serration formed on its outer peripheral surface. The stem portion extends from a bottom portion of the mouth portion in its axial direction as an integrated part. An induction hardened area C is formed in the bottom portion of the mouth portion.

Abstract: A shaft member 1 and an outer peripheral member 2 disposed on the outer periphery of the shaft member 1 are joined together by splines 3 through which the teeth 31 of the shaft member 1 and the teeth 32 of the outer peripheral member 2 are fitted together. At one axial end of each spline 3, a trough 31 in the tooth 31 of the shaft member 1 is diametrically increased to provide a diametrically increased region S1. In this diametrically increased region S1, there is defined a fit region F for the tooth 31 of the shaft member 1 and the tooth 32 of the outer peripheral member 2.

Abstract: A shaft member 1 and an outer peripheral member 2 disposed on the outer periphery of the shaft member 1 are joined together by splines 3 through which the teeth 31 of the shaft member 1 and the teeth 32 of the outer peripheral member 2 are fitted together. At one axial end of each spline 3, a trough 31 in the tooth 31 of the shaft member 1 is diametrically increased to provide a diametrically increased region S1. In this diametrically increased region S1, there is defined a fit region F for the tooth 31 of the shaft member 1 and the tooth 32 of the outer peripheral member 2.

Abstract: The invention relates to a motor, and more particularly to a motor having means for detecting an index position. A rotor yoke of the motor is provided with a recess having a width greater than the width of each pole of a rotating magnet. Substantially the whole of one pole of the rotating magnet and a part of another pole adjacent to the one pole on the downstream side in terms of rotation of a rotor are exposed to the recess. The magnetic flux from the magnet exposed to the recess is detected by a Hall element disposed in opposition to the outer circumference of the rotor, thereby specifying the index position.

Abstract: A method of preparing a leaf spring having a heating step in which a raw material of a leaf spring is heated to austenite range temperature, a rolling step in which the above heated material is formed to a desirable shape, a working step in which the above rolling material is cut to a fixed length to form a chip hole, a bolt hole or the like, and a cooling step in which a camber is given to the above working material to cool to hardening in his state.Other five modified methods are also described.

Abstract: A hair cosmetic composition having a strong gelation-preventive property comprising about 0.1 to about 10% by weight of a certain quaternary ammonium salt, about 0.05 to about 3.0% by weight of a certain 1-hydroxy-2-pyridone salt, about 0.05 to about 20% by weight of a certain polyol derivative, and a cosmetically acceptable carrier.