Abstract: A wheel rolling bearing unit has a hub spindle having flange and shaft-shaped sections, an inner-ring raceway surface on the outer peripheral surface of the shaft-shaped section; an outer ring member disposed around the outer periphery of the shaft-shaped section, an outer-ring raceway surface on the inner peripheral surface thereof; and rolling elements between the inner-ring raceway and outer-ring raceway surfaces. The flange section is on one side of the spindle in a rotation axis direction thereof; on the flange surface, a cylindrical spigot joint section protruding on one side is coaxial with the spindle; the boundary section of the flange surface and the outer peripheral surface of the spigot joint section has an arc-shaped boundary surface to connect smoothly toward the flange surface. The surface roughness of the boundary surface is finer than that of the flange surface and the outer peripheral surface of the spigot joint section.

Abstract: A controller includes: a circuit board; a retaining member; a bus bar that has an embedded portion embedded in and retained by the retaining member and an exposed portion that is exposed from the retaining member and that is electrically connected to the circuit board; and an electrical element that has a terminal connected to the exposed portion. The bus bar is formed in such a manner that a metal plate of which an outer surface is plated with a plating layer is cut along a predetermined cutting plane. The cutting plane at the exposed portion has a parallel portion that is arranged substantially parallel to a principal surface of the circuit board. The parallel portion and the terminal are joined to each other.

Abstract: A machining center wherein improved workability of a control board, a widened movable zone of a column and a reduced installation space are achieved. The machining center includes a column movably supported on a column sliding portion in an X-axis direction, a work table movably supported on a table sliding portion in a Z-axis direction, a main spindle head slidably supported on the column in a Y-axis direction, and an automatic tool changer disposed at an inner side of the column sliding portion. The control board is arranged at an opposite side of the automatic tool changer and is provided in parallel with a side surface of a front portion of a table sliding portion and is arranged side by side with an openable/closable door for an operator provided on a side surface of a cover in a vicinity of a rear end portion of the side surface of the table sliding portion.

Abstract: A ball joint includes a tubular boot, an upper end portion and a lower end portion of which are fitted onto an intermediate portion of a shaft of a ball stud and an open end of a housing, respectively. An annular lip portion is formed at the upper end portion of the boot. The lip portion has a first sliding contact face that is in contact with an outer periphery of the shaft, a second sliding contact face that is in contact with a lower face of the knuckle arm, and an annular rib that is formed so as to project inward beyond the first sliding contact face from an upper end portion of the first sliding contact face. The rib is elastically deformed due to contact with the shaft so as to extend along the first sliding contact face and project upward beyond the second sliding contact face.

Abstract: An grease supply system includes a discharge portion that forcibly discharges a grease from a rolling bearing, a discharge amount measuring portion that measures a discharge amount of grease, a replenishing amount setting portion that sets a replenishing amount of grease on the basis of the discharge amount of grease measured by the discharge amount measuring portion, and a supply portion that automatically replenishes the rolling bearing with the set amount of grease.

Abstract: A control device for a motor unit includes: a housing including a bottom wall, a side wall and an accommodation space formed so as to be surrounded by the side wall; a heat sink including a first heat dissipation wall portion upright from the bottom wall in the accommodation space, the first heat dissipation wall portion upright having a first heat dissipation principal surface; a first board portion mounted on the first heat dissipation principal surface and having a first principal surface; and a circuit board including a power element mounted on the first principal surface.

Abstract: A one-way clutch is arranged between an output shaft of a speed increaser and a drive shaft of a generator in a wind power generator. The one-way clutch includes an inner ring, an outer ring, a plurality of rollers arranged between an outer periphery of the inner ring and an inner periphery of the outer ring, a cage that retains the rollers at predetermined intervals in a circumferential direction, and a plurality of elastic members that is attached to the cage and that urges the corresponding rollers in one direction. The cage includes a pair of axially facing annular portions and a plurality of cage bar portions formed separately from the annular portions, both axial end portions of each of the cage bar portions being fitted to the respective annular portions.

Abstract: In an in-wheel motor driving device, since an involute speed reduction gear with a small difference in number of teeth which can be made small in size can be disposed on an inner side of an inner rotor type motor, a size of the in-wheel motor driving device in the direction of a rotational axis can be reduced. Further, in the inner rotor type motor, since a first stator is disposed so as to face a radially outer side of a large-diameter rotor, heat generated in the first stator is easily dissipated. On the other hand, in an outer rotor type motor, since a second stator is disposed so as to face a radially inner side of a small-diameter rotor, a torque radius of the small-diameter rotor can be made large, thereby making it possible to ensure a large torque capacity. Because of this, the outer rotor type motor can be made smaller in diameter than the inner rotor type motor, thereby making it possible to ensure a large space within a wheel.

Abstract: A reduction gear coupled to an electric motor includes: a first bearing that rotatably supports a first end portion of a worm shaft such that the worm shaft is allowed to oscillate in an oscillation direction about the first end portion; and a first elastic member that elastically urges a second bearing in such a direction that an axis-to-axis distance between the worm shaft and the worm wheel reduces. The first end portion and an output shaft of the electric motor are coupled by a joint. A second elastic member located between the joint and the first end portion elastically urges the worm shaft toward a second end portion and applies a preload on the first bearing. An outer ring of the first bearing is interposed in an axial direction by the third elastic member and the fourth elastic member.

Abstract: In a driving force transmission apparatus, an oil inlet portion for introducing hydraulic fluid from one of spaces to the other one of the spaces is formed, and an apparatus case has an oil outlet portion for delivering the hydraulic fluid from the other one of the spaces to an outside of the other one of the spaces with an oil delivery capacity lower than an oil introducing capacity of the oil inlet portion. A pressure regulation valve for bringing the oil inlet portion into an open state upon reception of hydraulic pressure higher than or equal to a predetermined pressure from hydraulic fluid is arranged at the oil inlet portion.

Abstract: A torque detecting device and an electric power steering system are provided. A torque sensor includes a first rotor that is fixed to an input shaft and that has a predetermined shaft angle multiplier, and a second rotor that is fixed to an output shaft and that has a shaft angle multiplier different from that of the first rotor. In first to fourth output coils arranged on a stator that is arranged around outer peripheries of the first and second rotors, electric signals having different phases are generated on the basis of a variation of a gap between the stator and the first and second rotors. A twist angle of a torsion bar is calculated on the basis of the electric signals, and a torque that acts between the input shaft and the output shaft is calculated on the basis of the twist angle.

Abstract: A motor control device includes an anomaly detection means that detects an anomaly occurring on power feeding paths of respective phases on the basis of first electric current values, second electric current values of the respective phases and a phase electric current value obtained by the first electric current values and the second electric current values. When at least one of an absolute value of the first electric current value and an absolute value of the second electric current value exceeds a first threshold value corresponding to a limit value of an electric current detection and an absolute value of the phase electric current value is smaller than a second threshold value corresponding to zero in any one phase, the anomaly detection means determines that an anomaly of an electric current sensor has occurred as regards the corresponding phase.

Abstract: There is provided an electric pump device that can suppress the generation of vibration or noise. When reducing hydraulic pressure supplied from an oil pump with the increase of hydraulic pressure supplied from a main pump driven by an engine, an electric oil pump ECU performs a pressure reducing control gradually reducing the hydraulic pressure.

Abstract: A machine tool includes: a hydraulic pump that supplies pressure oil; a fixture plate that positions a workpiece; a fixture base that detachably holds the fixture plate and that moves relative to a tool during machining; a hydraulic cylinder performs an attaching/removing operation for attaching or removing the fixture plate to or from the fixture base; an accumulator that accumulates the pressure oil from the hydraulic pump and that supplies the pressure oil to the hydraulic cylinder; and a manual valve that is manually switched to supply the pressure oil in the accumulator to the hydraulic cylinder to thereby control the attaching/removing operation of the hydraulic cylinder.

Abstract: A crankshaft has eccentric holes communicating with each other. The eccentric hole extends in the axial direction of the crankshaft from one end surface of the crankshaft and is disposed so as to be eccentric in the same direction as a cam section. The eccentric hole extends in the axial direction of the crankshaft from the other end surface of the crankshaft and is disposed so as to be eccentric in the direction of the eccentricity of a cam section. A centrifugal force due to the rotation of the crankshaft generates a force couple about an axis which is perpendicular to the axis of the crankshaft. The force couple is reduced by the eccentric holes. The cam sections are arranged around the axis of rotation with the phases shifted by 180 degrees from each other. As a result, a translational force acting in the direction perpendicular to the axis of the crankshaft is also reduced.

Abstract: A vehicle steering device performs a tilt operation of a steering shaft to a predetermined position by using a driving force of a motor, a steering wheel being mounted to an upper end of the steering shaft. The vehicle steering device includes: a tilt drive motor allows the steering shaft to move during the tilt operation; and a control unit which controls driving of the tilt drive motor. The control unit drives the tilt drive motor so as to determine a tilt displacement amount from an open loop transfer function of a mechanical system which takes inertia and viscosity of a steering column into consideration, based on a resultant force of torque of the tilt drive motor and steering torque, which is generated in the steering column in which the steering shaft is rotatably supported.

Abstract: A four-wheel drive vehicle includes: a driving force transmission system which transmits torque of a drive source to front wheels and rear wheels via gear mechanisms; a clutch provided in the driving force transmission system and capable of controlling an amount of the torque transmitted to the rear wheels; and a pressing mechanism which presses the clutch by transforming a part of the torque transmitted to the rear wheels into axial thrust. In the driving force transmission system, gear ratios of the gear mechanisms are set such that a direction of a differential rotation between a drive shaft connected to an input side of the clutch and a drive shaft connected to an output side of the clutch is not reversed even when a steered angle of the front wheels changes to a maximum value while the four-wheel drive vehicle is traveling forwards.

Abstract: A resolver according to the invention includes a stator provided with a plurality of teeth, and first to third phase output coils wound around the teeth. When voltages induced in the first to third phase output coils change based on rotation of a rotor, voltage signals corresponding to an electrical angle of the rotor are output from the output coils. One of the first to third phase output coils is wound around each of the teeth. With respect to each of the phases, the distribution of the numbers of turns of each phase output coils, among the first to third phase output coils, is set to a sinusoidal distribution with respect to the electrical angle of the rotor.

Abstract: The present invention discloses a machining control apparatus capable of decreasing a machining error, comprising: a rotation velocity decision process part for deciding a rotation velocity of the rotation tool in such a way that an amplitude of vibration of the rotation tool is decreased, based on a vibration state of the rotation tool and a vibration phase of the rotation tool when the rotation tool receives the cutting resistance force, in the case that the rotation tool vibrates due to the interrupted cutting resistance force generated in the rotation tool during the interrupted cutting; and a rotation velocity control part for controlling the rotation velocity(S) of the rotation tool based on the rotation velocity decided.