Abstract: A power transmission shaft includes a swaged boot-engaging groove on an outer circumference of thereof. Further, the power transmission shaft includes a reduced diameter portion provided in the vicinity of the boot-engaging groove. The reduced diameter portion is formed by swaging at the same time as the boot-engaging groove is formed.

Abstract: A motor control device includes: a motor-current detection unit; a rotational-angular-speed calculation unit for calculating a rotational angular speed of a motor; a rotational-angle-change-amount calculation unit for multiplying the rotational angular speed by a predetermined time so as to calculate a motor-rotational-angle change amount within a predetermined time; a basic-drive-value calculation unit for calculating a basic drive value for driving the motor; a correction-value calculation unit for calculating a correction value for correcting the basic drive value based on the motor current and the motor-rotational-angle change amount; a correction unit for evaluating the motor drive value by correcting the basic drive value by the correction value; and a drive unit for driving the motor by using the motor drive value evaluated by the correction unit.

Abstract: The shaft apparatus comprising a shaft, blocks fitted to an outer surface of the shaft in an axial direction at predetermined intervals, and a roller bearing. The roller bearing includes an inner ring fitted and fixed to the outer surface of the shaft, an outer ring, and a plurality of rollers interposed between the inner and outer rings to roll. First and second control rings for controlling the movement of the outer ring in the axial direction of the shaft are disposed between the shaft and the outer ring.

Abstract: Blocks and inner rings of rolling bearings are arranged on the outer surface of a hollow shaft at predetermined intervals in the axial direction thereof. The outer surface of the hollow shaft is plastically deformed in its diameter enlarging direction so as to be press-fit to the inner surface of the blocks and inner surface of the inner rings of the rolling bearings. In this state, the blocks and inner rings of the rolling bearings are fixed to the outer surface of the hollow shaft.

Abstract: An electric power steering apparatus includes a reduction gear mechanism (17) for reducing the rotation speed of an output shaft (16) of an electric motor (15). The reduction gear mechanism (17) comprises an inscribed gear (39) rotatable interlockingly with the output shaft (16), and a circumscribed gear (40) in which the inscribed gear (39) is inscribed. An endless belt connects a driving pulley (41) integrally rotatable with the circumscribed gear (40) and a driven pulley (42) disposed so as to surround a steerable shaft. By heightening the reduction gear ratio by the speed reduction using the inscribed gear (39) and the circumscribed gear (40), the reduction gear mechanism (17) as a whole can achieve a high reduction gear ratio without making the diameter of the driving pulley (41) very small.

Abstract: An electric power steering system includes an assisting electric motor for assisting steering force according to a vehicle speed and a steering torque, a power supply source and an electric power steering controlling portion for supplying power to the assisting electric motor from the power supply source for controlling the assisting electric motor. The electric power steering controlling portion completely stops the controlling of the assisting electric motor being controlled and stops operating when the power supply source is in a first abnormal state and temporarily stops the controlling of the assisting electric motor being controlled until the power supply source returns to a normal state from a second abnormal state when the power supply source is in the second abnormal state.

Abstract: There is provided a power steering apparatus comprising a torque sensor detecting a steering torque capable of discriminating a normal input and an inverse input without a torsion bar. An intermediate gear engaging with rack teeth provided in an outer surface of a rack shaft and a pinion provided in a lower portion of a pinion shaft is interposed between both the rack tooth and the pinion. A force applied to the pinion shaft is detected by a first force sensor, a force applied to a support shaft of the intermediate gear is detected by a second force sensor, and a torque detection value capable of discriminating the normal input and inverse input is calculated by a torque calculating unit to which outputs of both the sensors are given.

Abstract: A reduction gear unit capable of reducing vibrations caused by gear rattle, while permitting some degree of backlash in a pair of gears, is provided. A reduction gear unit is so configured that a pinion shaft and a main gear shaft are disposed in parallel to each other, and a pinion 1 mounted on the pinion shaft and a main gear 2 mounted on the main gear shaft are arranged to mesh with each other, so as to transmit a rotation of the pinion shaft to the main gear shaft, and includes a housing 11 that encloses the pinion 1 and the main gear 2, where the housing 11 has an inner surface whose width, in a cross section perpendicular to an axial direction of the pinion shaft and the main gear shaft, perpendicular to an imaginary line that connects centers of the pinion shaft and the main gear shaft evenly increases from a pinion side toward a main gear side between ends of arcuate regions respectively enclosing the main gear and the pinion.

Abstract: When an electrification failure occurs in any of the phase of a motor, a control device of an electric power steering device executes current control for generating, in each of two electrification phases other than a phase with the electrification failure, a phase current that changes in the form of a secant curve or a cosecant curve based on an asymptotic line, which is a predetermined rotational angle corresponding to the phase with the electrification failure, to thereby continuously output a motor control signal. The control device of the electric power steering device executes current restriction for restricting the phase current within a predetermined range. The control device of the electric power steering device further executes control for accelerating rotation of the motor during two phase drive, in order to prevent the occurrence of a stuck steering wheel during low-speed steering, which is caused as a result of the execution of the current restriction.

Abstract: Magnetic pole nails 51, 51 . . . aligned on magnetic yokes 5, 5 that integrally rotate with the second shaft 2 are formed in a rectangular shape, and the circumferential width and alignment pitch of the magnetic pole nails 51, 51 . . . are appropriately determined with respect to the magnetization pitch of the N-poles 40, 40 . . . and the S-poles 41, 41 . . . circumferentially aligned on the cylindrical magnet 4 that integrally rotates with the first shaft 1, so that a variation in magnetic flux generated on the magnetic yoke 5, 5 in accordance with the relative displacement between the cylindrical magnet 4 and the magnetic yoke 5, 5 uniformly takes place in a larger amplitude. Thus, a torque detecting apparatus that achieves higher detection accuracy with a simple structure can be provided.

Abstract: Surfaces of the raceway grooves of the outer and inner rings, a surface of each ball and all surface of the cage are coated with titanium oxide. In other words, hydrophilic layers made of titanium oxide are formed on the surfaces of the raceway grooves of the outer and inner rings, the surface of each ball and all surface of the cage.

Abstract: In a rolling bearing device for a road-wheel including an inner shaft 1 that is provided with, on its outer-side end 10, a flange 4 on which a road-wheel member mounted, and an outer ring 2 disposed around the inner shaft 1, the inner shaft has, on its outer side, a hair-line pattern portion 5 that is formed by turning and that permits the manufacturing attribute of the bearing device to be identified based on the difference in the form of hair lines so formed. This permits the manufacturing attribute of the bearing device to be identified after the bearing device is assembled in a vehicle body. Furthermore, the representation of the manufacturing attribute can be readily implemented during a manufacturing step.

Abstract: After a rod-like titanium material 20 is accommodated in a generally linear-shaped groove 13 of a first mold 7, a first guide portion 15 of a second mold 8 is fitted to the groove 13. Thereafter, the first mold 7 is moved along an arrow A direction relative to the second mold 8 fixed to an anchor block, by which the titanium material 20 substantially immovably retained in the groove 13 of the first mold 7 is bent and pushed into a through hole 24 of the second mold 8 by the first guide portion 15, thus being plastically deformed.

Abstract: A moving section of a parallel mechanism is fed having two freedoms. A first moving section base is screw-engaged with a first feed screw shaft, and a second moving section base is screw-engaged with a second feed screw shaft. A spindle head is pivotably connected by a support shaft to the first moving section base. A coupling shaft at an extreme end of an extension lever extending downward from the spindle head is rotatably coupled to a guided piece on a slant linear guide provided on the second moving section base and is coupled to the second moving section base. Thereby, a tilt function maintaining advantages of a tandem drive and being high in rigidity is realized without increasing control axes beyond the number of axes corresponding to tandem axes.

Abstract: In a rolling bearing provided with an outer ring connected to a mounting opening of a knuckle, an inner ring connected to a wheel through a hub, a rolling element intervening between the outer ring and the inner ring and a sealing device for sealing the space between the inner and outer rings from the outside, the rolling bearing is provided with a sealing member for limiting the foreign substance invading the rolling bearing side from a clearance existing between a drive shaft provided rotatably with the inner ring and the knuckle, the sealing member including a ring-shaped cover including a cylinder press-fit in the outer ring and a ring-shaped upstanding wall extended radially inwardly from the cylinder and an outer lip provided at an inner diameter end of the ring-shaped upstanding wall, the outer lip serving to show the sealing function in cooperation with the drive shaft.

Abstract: An outer peripheral cylindrical surface 13, 17, which is a non-engagement outer peripheral surface, is formed in an outer periphery of an annular portion 3 and a portion 15 of each of pillar portions 4, while an engagement portion formed of an edge 9 is formed on an outer periphery of the other annular portion 2 and another portion 14 of each of the pillar portions 4. The outer peripheral cylindrical surface 13, 17 is formed inside a circle smaller by a specified size than a circumcircle of the edges 9.

Abstract: A grinding method of a rotating workpiece W having a cylindrical part 20 and a pair of end faces 21 at both sides of the cylindrical part 20 uses a grinding wheel 10 whose grinding stone is narrower than a finishing width S1 between the end faces 21. In a first grinding step, the grinding wheel 10 is relatively moved to the cylindrical part 20 in a direction crossing the rotational axis of the workpiece W and is shuttled along the rotational axis of the workpiece W at least one time between the finishing width S1 of the end faces 21 until the grinding wheel 10 reaches the cylindrical part. And in a second grinding step, the grinding wheel 10 is moved from one of the end faces 21 to the opposite end face 21 on the cylindrical part 20, so as to finish the end faces 21 to a predetermined width S1.

Abstract: An electric power steering system which includes a torque detector for detecting a steering torque applied to a steering member and a steering assist brushless DC motor, whereby a plurality of phase currents are caused to flow to the brushless DC motor based on the steering torque detected by the torque detector so as to give steering assistance. A current detector for detecting each of the plurality of phase currents, an adder for adding up respective values of the currents detected by the current detectors and a determination device for determining whether or not a result of an addition by the adder falls outside a predetermined range are provided, whereby it is designed to determined as abnormal when the determination device determines that the result of the addition falls outside the predetermined range.

Abstract: A power transmission chain (1) includes connection members (3; 3A; 4) flexibly connecting corresponding links (2) of a plurality of link rows (52; 52; 53). The connection members (3; 3A; 4) include a first power transmission member (3; 3A) and a second power transmission member (4). The chain (1) includes a module (40; 40A) as a unit element. A moving locus of a contact part (T1; T1A) between the corresponding first and second power transmission members conjunction with flexure between the links (2) defines prescribed curve. The positions of a gravity center (GC; GCA) of the contact part (T1; T1A) and the module (40; 40A) in the chain straight area are space apart by a prescribed distance from each other with respect to an orthogonal direction (V) perpendicular to both a chain advancing direction (X) and a chain width direction (W).

Abstract: First shoulder portions are formed on the outer periphery of the shaft such that the first spline grooves of the shaft are interposed between the first shoulder portions adjacent to each other in a circumferential direction of the shaft. Second shoulder portions are formed on the inner periphery of the outer tube such that the second spline grooves of the outer tube are interposed between the second shoulder portions adjacent to each other in a circumferential direction of the outer tube. Main passages of spline-purpose ball circulation passages are formed as a result of forming the first and second shoulder portions. Clearance are formed respectively between the first shoulder portions and the spline-purpose balls and between the second shoulder portions and the spline-purpose balls in a rotational direction of the screw shaft and the spline-purpose outer tube.