Abstract: A rotation transmitting apparatus according to the present invention includes a first sun gear, a second sun gear, first planetary gears and second planetary gears. A carrier for supporting the respective planetary gears is integrally provided with a rotor of a speed change motor for changing a speed of rotation to be transmitted, so that the number of mesh portions in the gears is reduced. Further, the rotor is formed of a cylindrical shape and an input shaft for rotating the first sun gear is inserted into the rotor, so that a limited space is effectively used.

Abstract: Deep groove ball bearings are used as bearings supporting both side portions of a worm. In the first bearing on the side of a motor, the curvature radius of a raceway groove in an inner ring or the curvature radius of a raceway groove in an outer ring are set to a specific numerical range with respect to the diameter of a ball.

Abstract: A torque detecting apparatus is provided which is capable of easily positioning a magnetic sensor in relation to a corresponding pair of magnetism collecting projections and thus improving the detection accuracy of the magnetic sensor without increasing the number of assembling and processing steps. A pair of magnetism collecting projections 60 and 60 of each magnetism collecting ring 6 are arranged to extend not in their respective radial directions but substantially in parallel to each other while two magnetic sensors 7 and 7 are mounted to a circuit board 70 and inserted along the direction of projection of the magnetism collecting projections 60 and 60 into the air gaps respectively between the two magnetism collecting projection 60 and 60 of one magnetism collecting ring 6 and the two magnetism collecting projection 60 and 60 of the other magnetism collecting ring 6.

Abstract: A hub unit is equipped with an inner member having an inner ring raceway formed on its outer peripheral face, an outer member having an outer ring raceway formed on its inner peripheral face, and a plurality of rolling elements provided between the inner ring raceway and the outer ring raceway. At least one of the inner ring raceway and the outer ring raceway has a rolling contact zone on which an induction-hardened layer is formed. The hardened layer has a depth of about 1.5 to 1.9 mm at a distance of 1 mm inward from each end of the hardened layer.

Abstract: A low speed region position estimating portion is designed to be suitable for when the motor is operating in a low speed region, and estimates a low speed estimated rotational position ??L. A high speed region position estimating portion is designed to be suitable for when the motor is operating in a high speed region, and estimates a high speed estimated rotational position ??H. A dividing portion obtains a divided estimated rotational position ??M by internally dividing the low speed estimated rotational position ??L and the high speed estimated rotational position ??H. A rotation speed calculating portion obtains a rotation speed ? of a rotor based on an output signal from a steering sensor. The rotational position of the rotor is then obtained by selecting one of i) the low speed estimated rotational position ??L, the high speed estimated rotational position ??H, or the divided estimated rotational position ??M, based on that rotation speed ?.

Abstract: A rotational angle correction controller controls generation of an inverse assist torque using the “phase deviation” due to the correction of the rotational angle ?, thereby performing the rotational angle correction control to smooth rotation of the motor during two phase drive. In addition, the rotational angle correction controller functions as the oscillation detection means that detects the occurrence of oscillation in the steering system. When the level of the detected oscillation exceeds the predetermined level, the correction amount in the rotational angle correction control is reduced.

Abstract: A resin pulley includes: an outer cylindrical portion having an outer circumferential surface on which a belt is to be wound; an inner cylindrical portion which is disposed radially inwards of and concentrically with the outer cylindrical portion; and a plurality of ribs connecting an inner circumferential surface of the outer cylindrical portion and an outer circumferential surface of the inner cylindrical portion. The outer cylindrical portion, the inner cylindrical portion and the ribs are formed integrally from a resin material, and the ribs are provided in such a manner as to be inclined towards a circumferential direction relative to a radial imaginary line as viewed in an axial direction.

Abstract: A controller for a brushless motor determines difference between target currents and detected currents in a dq coordinate system and determines a target voltage applied to an armature winding based on a feedback calculation, such as PI (Proportional Integral) calculation, P (Proportional) calculation, or PID (Proportional Integral Derivative) calculation, to decrease the differences.

Abstract: The rotational angle correction controller includes a second correction amount-computing part that computes a second correction amount ?2 for correcting the rotational angle ? such that the phase is shifted in the steering operation direction, and the rotational angle correction controller performs the rotational angle correction by adding the computed second correction amount ?2 to the rotational angle ?. Further, the rotational angle correction controller includes a stuck steering wheel determining part that detects the significant reduction in the follow-up performance of the motor with respect to the steering operation that occurs due to the existence of the deceleration section caused by execution of the above-described electric current restriction, that is, the occurrence of the stuck steering wheel. When the occurrence of the stuck steering wheel is detected, the second correction amount-computing part changes the second correction amount ?2 to a value (?2?) larger than the normal value.

Abstract: A differential gear mechanism includes a housing, first and second sun gears each including an external gear portion, and first and second planetary gears. The first and second sun gears include axial end surfaces pressed against contact surfaces provided at the housing by the first and second sun gears by means of thrust forces generated at engagement surfaces between the external gear portions and the planetary gears. Each of the sun gears includes a first portion having the external gear portion, a second portion, and a thrust force generating mechanism for generating thrust forces at the first portion and the second portion. A direction of the thrust force generated at the first portion by the thrust force generating mechanism is specified to be equal to a direction of the thrust force generated at the first portion by means of the engagement between the external gear portion and the planetary gear.

Abstract: A worm wheel includes an annular metallic core portion and a resin rim portion which is fitted on an outer circumference of the core portion. The rim portion includes an annular main body portion which covers the outer circumference of the core portion and in which a toothed portion is formed on an outer circumference thereof and a pair of annular flanges which are made to extend from the main body portion in a radially inward direction X to thereby cover, respectively, outer edge portions of first and second sides of the core portion. The first annular flange 53 engages with a recess formed in the corresponding side of the core portion. A bottom portion of the recess includes an undercut portion in relation to a radially outward direction.

Abstract: A yoke assembly is constructed by retaining integrally a yoke ring having positioning holes aligned with pole claws arranged equally on the inner circumference and a yoke ring having positioning holes aligned with the space between pole claws arranged equally on the inner circumference by a retaining cylinder made of a resin. The retaining cylinder has a pin hole remaining after pulling out a common positioning pin inserted into the positioning holes during molding.

Abstract: A rolling bearing device includes a first bearing ring member having a first raceway; a second bearing ring member having a second raceway; and a plurality of rolling elements interposed between the first raceway 1a and the second raceway. An elastic grease supplying container is disposed between the first bearing ring member and the second bearing ring member and has a nozzle for supplying grease toward at least one of the first raceway and the second raceway, the grease supplying container having a restoring property for returning to its original shape when the grease supplying container is extended.

Abstract: A camshaft apparatus includes rolling bearings which support a camshaft rotatably, whereby a reduction in torque when an engine is started or is running at low speeds, a reduction in vibration of the camshaft and an extension of the lives of the bearings can be realized. In the rolling bearings, one rolling bearing is made to constitute a main ball bearing which restrains an axial relative movement of the camshaft relative to a shaft case, and the other rolling bearings are made to constitute a plurality of needle roller bearings, whereby a mechanical movement of the camshaft in an axial direction can be restricted in an ensured fashion by the main ball bearing. As to relative displacements due to thermal expansion or contraction of the camshaft and/or the shaft case, an axial relative displacement can be absorbed by needle rollers relatively moving on inter-cam outer circumferential surface areas.

Abstract: A bearing apparatus includes: two split outer ring halves which includes outer ring raceway surfaces and are disposed within a supporting hole of the housing, respectively; and a plurality of rollers which are disposed on respective inner surfaces of the both split outer ring halves and supports a shaft. Each of the two split outer ring halves includes an oil hole penetrating the split outer ring half in a radial direction thereof and an oil groove formed on an outer diameter surface of the split outer ring half along a circumferential direction thereof to allow the oiling passage and the oil holes to communicate with each other. Each of the oil holes is disposed at a position located at an angle of within 45° from the joint surface of the split outer ring halves in an opposite direction to a rotating direction of the shaft.

Abstract: A roller bearing apparatus provided with a roller bearing having an outer ring with a cylindrical opening that opens at one end and a cover fitted in the opening against the inner periphery thereof to close it. The cover is provided with an inscribing surface that inscribes the. inner periphery of the opening and a stepped surface that protrudes radially outward from the inscribing surface to abut the axial end face of the opening. The axial end face of the opening is provided with a beveled part on the inner rim. An annular space formed by the beveled part, inscribing surface, and stepped surface is filled with sealant.

Abstract: In a ball screw device, a ball screw nut is rotated, causing a screw shaft to rectilinearly move in the axial direction, and the limit of the movement of the screw shaft is determined by a stopper. The ball screw device includes a hollow shaft that rotates together with the ball screw nut and in which the screw shaft is movably fitted. The hollow shaft is provided with a small diameter portion that exerts a dragging force on the screw shaft before the screw shaft reaches the limit, and a buffer layer is formed on a tip portion of the screw shaft.

Abstract: A distributed control system includes a plurality of PLCs which are connected together via active and backup transmission lines which are opposite in transmission direction. Each of the PLCs includes a diagnosis command sending program for sending a diagnosis command, via a diagnosis-command transmission line, which is one of the active transmission line and the backup transmission line, to a PLC located downstream on the diagnosis-command transmission line; and an acknowledgment returning program, operable upon receipt of the diagnosis command, for returning an acknowledgement response for the diagnosis command, via an acknowledgment-response transmission line, which is the other of the active transmission line and the backup transmission line, to a PLC located downstream on the acknowledgment-response transmission line.

Abstract: The method consists in: determining in which actually sector the booster motor is located, a sector of the booster motor being defied by two successive poles; determining a relative angle position of the steering wheel in relation to the booster motor; identifying a sector, known as neutral, in which the booster motor is located when the rotation speeds of the rear wheels, i.e. right and left of the vehicle, are equal; determining an angle offset of the steering wheel corresponding to a neutral angle position of the steering wheel; determining an absolute angle position of the steering wheel which is equal to the difference between the relative angle position of the steering wheel and the offset angle thereof.

Abstract: An ECU estimates the temperatures of the heat generating portions provided in a drive force transmission system, or a transaxle, a rear differential, and a torque coupling, in correspondence with not only the rotational speed (the differential rotational speed) of each heat generating portion and the torque transmission rate of the torque coupling but also the outside temperature detected by an outside temperature sensor. If the estimated temperature of any of the heat generating portions exceeds a respective predetermined temperature, the ECU controls operation of the torque coupling to suppress overheating of the heat generating portion. That is, the temperature of each heat generating portion is accurately detected through a simplified structure and overheating of the heat generating portion is effectively suppressed.