Abstract: A ball bearing 34 serving as a support reference for a pinion shaft 2 is located directly under a worm wheel 51. Thus, even when a temperature change occurs around the electric power steering apparatus, the engagement position between the worm wheel 51 and the worm 53 shifts only slightly in the axial direction of the pinion shaft 2. Furthermore, a bearing hole 47 into which an outer race of a lower needle bearing 36 is pressed and a bearing hole 45 into which an outer race of an upper ball bearing 34 is pressed are formed in a common lower gear box 41, and can be fabricated by through processing using a boring tool from the bearing hole 45 side.

Abstract: In a tilt and/or telescopic type steering column apparatus for a vehicle, in which a column sided bracket attached to a steering column is so provided as to be swingable about a car body sided bracket attached to a car body, the two brackets are press-fitted to each other by fastening a fastening bolt inserted through the two brackets and thus fastened in a tilt and/or telescopic adjustment position, while a tilt and/or telescopic adjustment can be made by releasing the two brackets from being press-fitted by slackening the fastening bolt, a balance or leap-up spring for biasing a pair of biasing end portions each other is provided, the one biasing end portion of the balance or leap-up spring is fitted to the car body or the car body sided bracket, and the other biasing end portion supports sad steering column or the column sided bracket, an improvement is characterized in that a slide member abutting on the steering column or the column sided bracket is attached to the other biasing end portion of the balanc

Abstract: A steering apparatus includes: an inner column which rotatably supports a steering shaft; an outer jacket which incorporates the inner column shiftably in an axial direction, at least a portion of the outer jacket being cylindrical; and an urging member for urging the inner column. The outer jacket includes: a pressed portion which extends in a direction leaving an axial line from the outer periphery of the outer jacket and is urged by the urging member, a slit which extends in the axial direction over the pressed portion from the end of the outer jacket, and a notch which leads to the slit extending over the pressed portion. The notch has a tapered shape which enlarges toward an opening side when the outer jacket is viewed in an urging direction of the urging member.

Abstract: End caps 3b are made from a resin having an izod impact strength with notch of 10.5 kJ/m2 or greater. Because of this, the occurrence of damage such as chipping or cracking to the end caps can be prevented, thereby making it possible to enhance the durability of the end caps when a linear guide apparatus is driven at high speeds.

Abstract: The present invention provides an electric power steering apparatus having: a motor that applies a steering assist power to a steering mechanism; a torque command value calculating part that calculates a torque command value based on a steering torque generated in a steering shaft and a vehicle speed; and a current command value calculating part that calculates a current command value of the motor based on the torque command value, and the motor is controlled based on the current command value, and the electric power steering apparatus further has: a yaw rate detecting part that detects or estimates a yaw rate of a vehicle; a target yaw rate calculating part that calculates a target yaw rate based on the vehicle speed and a steering angle; and a correcting part that calculates an amount of correction based on the yaw rate and the target yaw rate to correct the current command value.

Abstract: A telescopic adjusting electric power steering apparatus has a steering column 12 having an outer column 12a and an inner column 12b connected so as to be relatively extended and contracted, and rotatably supporting a steering shaft attaching a steering wheel 13 thereto; and an electric actuator 50 having one end portion attached to the outer column 12a and the other end portion attached to the inner column 12b, and extending and contracting the outer column 12a and the inner column 12b; wherein the electric actuator 50 has a rotation obstructing member 59 for obstructing relative rotation of the outer column 12a and the inner column 12b.

Abstract: The outside diameter ? of a land portion 1c is set to be larger than a BCD. Thus, when a ball 3 goes into a deep portion (a portion close to an axis line O of a screw shaft 1), the land portion 1c of the screw shaft 1 guides the ball. Consequently, the circulation of the ball 3 can smoothly be performed.

Abstract: A spacer is interposed between a body-side bracket and a column-side bracket for retaining a steering column. A pin insertion hole through which a supporting pin is passed is formed in the spacer. A portion of the spacer to be broken by the shock of collision is formed in a region of the spacer surrounding the pin insertion hole.

Abstract: Bearings for rotatably supporting a rotor are disposed on an inner side of a hollow cylindrical portion of the rotor which is disposed in a rotating magnetic field formed by a group of stator windings and on an outer periphery of which magnetic poles for generating torque are arranged, thereby shortening the axial length of the rotor and making a motor compact. A motor of the invention includes: a stator in which a plurality of split cores with windings wound therearound are arranged in an annular form to generate a rotating magnetic field; a rotor for generating torque by the rotating magnetic field; and a housing for fixing the stator and for rotatably holding the rotor at an annularly central position of the stator, wherein only one end side of the stator is fixed to the housing.

Abstract: A steering column apparatus comprising: a steering column provided with a body-side bracket mounted to a body strength member to have a pair of side plate portions opposed each other to be extended in a vertical direction, and a substantially cylindrical distance unit for supporting a steering shaft to be rotatable therein and having a pair of pressed and expanding portions formed to be expanded by plastic working to be pressed and supported by the side plate portions of the body-side bracket; and an adjusting mechanism capable of adjusting a position of the steering column with respect to the side plate portions of the body-side bracket within a predetermined range, wherein the steering column is formed with a reinforcement portion for enhancing the clamping rigidity of the distance unit with respect to the side plate portions.

Abstract: A rotary shaft and a rotation driven member are connected as to transmit motive power when the rotary shaft rotates relatively to the rotation driven member. A roller gets displaced to a first position where a frictional force with an outer race and the rotation driven member decreases, thereby permitting transmission of a rotational force from the rotary shaft to the rotation driven member. When the rotation driven member rotates relatively to the rotary shaft, the roller gets displaced to a second position where the frictional force with the outer race and the rotation driven member increases, thereby rotationally fixing the rotation driven member with respect to the outer race. The power transmission from a brake apparatus to an electric motor can be hindered while permitting the power transmission to the brake apparatus from the electric motor by using either a worm exhibiting a relatively low transmission efficiency or a worm wheel.

Abstract: A drive control device of an unconnected motor capable of resolving power shortage and increasing motor output without using a boost circuit, and an electric power steering device using the unconnected motor. The drive control device comprises an unconnected motor (12) having a rotor in which permanent magnets are allocated and a stator opposing the rotor, in which armature winding Lu to Lw of a plurality (N number) of phases are independently arranged, a pair of inverter circuits (34a, 34b) individually connected to both ends of each armature winding, and a drive control circuit (15) which drives the pair of inverter circuits (34a, 34b) with a predetermined number (e.g. 2N) of PWM drive control signals.

Abstract: The present invention provides a motor control method and a motor controller. In the motor control method and the motor controller according to the present invention, even when production tolerance of a motor or a control unit (ECU) or the change of an environment arises, abnormal sound of the motor due to the saturation of a motor applied voltage (Duty 100%) is not generated and a maximum output of the motor can be obtained and they may be applied to an electric power steering device. In a motor control method for controlling a motor by a motor driving voltage command value of a PWM, the motor control method includes the steps of calculating a degree of saturation of a motor driving voltage, and correcting a motor current command limit value based on the degree of saturation of the driving voltage.

Abstract: Distortions of motor voltage and current and a torque ripple of the motor are generated by dead band compensation for preventing an arm short circuit of an inverter, and a feeling of physical disorder is given in a handle operation. Therefore, the distortions of the motor voltage and current and the torque ripple of the motor are improved by using the dead band compensation for estimating the voltage distortion on the basis of a model current generated from a current command value such that no feeling of physical disorder is given in the handle operation of an electric power steering apparatus.

Abstract: A pulley drive mechanism 26 for driving a second pulley 23 includes: a spline shaft 27 rotated integrally with the second pulley 23, for supporting the second pulley so that the second pulley can be moved in the direction of Y-axis in the drawing; a third pulley 28 arranged at one end portion of the spline shaft 27; and a third belt drive mechanism 29 for driving the spline shaft 27 through the third pulley 28.

Abstract: In a resolver digital converter comprising a resolver, a resolver digital conversion part, and an excitation signal generation part, the resolver digital converter for inputting an excitation signal generated in the excitation signal generation part to the resolver and inputting resolver signals outputted from the resolver to the resolver digital conversion part, a locus in which amplitude of a sine component signal among the resolver signals sin(?), cos(?) outputted from the resolver is plotted as the ordinate axis and amplitude of a cosine component signal is plotted as the abscissa axis is approximated by a polygon and when the locus matches with sides of the approximated polygon, it is determined that the resolver is in a normal state and when the locus does not match, it is determined that the resolver is in a failure state.

Abstract: In a continuously variable transmission apparatus, by adjusting the transmission ratio of a toroidal continuously variable transmission, an output shaft can be stopped while an input shaft is left rotating in one direction by a drive source. And, when, while the vehicle is running, a select lever is operated to a select position in the reverse direction to the vehicle running direction, in a state where a clutch device is connected, the speed ratio of the continuously variable transmission apparatus is changed from a value corresponding to the vehicle running state to a value 0 capable of realizing the above-mentioned stopping state along a preset condition.

Abstract: A linear-motion device has: a slider provided onto a guide rail relatively movably; and a plurality of rolling elements for causing the slider to move relatively in a longitudinal direction of the guide rail; whereby the slider comprising a slider block having rolling-element rolling grooves that oppose to rolling-element rolling grooves formed on the guide rail, and end caps that close both-end openings of the rolling-element rolling paths formed between the rolling-element rolling grooves on the slider block and the rolling-element rolling grooves on the guide rail, and rolling-element return paths for returning the rolling elements, which have rolled in the rolling-element rolling paths, are formed on the slider block, wherein the rolling-element return paths comprises a groove portion formed on an outer surface of the slider block along the longitudinal direction of the guide rail, and a cover member for covering the groove portion.

Abstract: A pair of ball bearings 19, 19 and a roller clutch 20 are provided between the outer peripheral surface of the sleeve 18 fitted and fixed onto the rotating drive shaft of a starter motor and the inner peripheral surface of the pulley element 17 around which an endless belt for starting an engine extends. The roller clutch 20 has a concave section 32 on the inner peripheral surface of the clutch outer ring 30 to define a cam surface 31. After the engine is started, the rollers 33, 33 move toward the bottom of the concave section 32 against the resilient force of the springs 40. And, the rolling contact surface of the rollers 33, 33 is separated from the outer peripheral surface of the clutch inner ring 29. Consequently, the friction heat which would be produced after the engine start is suppressed, and a structure having an excellent durability as a unit for starting the engine of the idling-stop vehicle is realized.

Abstract: The invention provides a motor for a brushless DC motor, which has small torque ripple even if a trapezoidal wave current is supplied and has a small size and reduced motor noise, and a drive control device for the motor as well as an electric power steering apparatus using the motor and the drive control device. Respective phase current command values are calculated on the basis of vector control. Pseudo-vector control for controlling respective phases separately is used as current feedback control.