Abstract: A multi-row ball screw includes a nut having a plurality of spiral grooves on an inner peripheral surface thereof, a screw shaft having a plurality of spiral grooves on an outer peripheral surface thereof, and a plurality of balls disposed so as to be rollable on rolling paths constituted by the plurality of spiral grooves of the nut and the plurality of spiral grooves of the screw shaft. The spiral groove of the nut includes a U-shaped first spiral groove having left and right flanks that are respectively able to come into contact with two-row balls and separated from each other in an axial direction, and two second spiral grooves continuous with each row of the first spiral groove and each having left and right flanks that are able to come into two-point contact with the ball.

Abstract: A motor control device includes temperature detection elements that are mounted on a circuit board on which a first power conversion circuit and a second power conversion circuit are mounted and are arranged at a position between the first power conversion circuit and the second power conversion circuit.

Abstract: Disclosed are a state monitoring device and a state monitoring method for a ball screw, which enable appropriate collection of data to accurately diagnose the state of the ball screw. The state monitoring device monitors the state of the ball screw having a screw shaft, a nut, and a plurality of balls. The state monitoring device includes a drive control unit for controlling a drive unit (servo motor) to cause the screw shaft and the nut to move relative to each other at a constant speed for one or more reciprocating motions under an unloaded condition, and a data collection unit for collecting, as data, physical quantities related to the ball screw while the drive unit is controlled by the drive control unit.

Abstract: A nut of a ball screw is formed with, in a notch portion, an elongated hole that penetrates in a radial direction, and whose longitudinal direction is formed along a lead angle and parts of both longitudinal side surfaces parallel to each other guide balls. A circulation part includes: a first circulation component that is disposed in the notch portion so as to abut against a bottom wall surface of the notch portion and has a tongue portion accommodated in the elongated hole; a second circulation component that is disposed in the notch portion so as to cover the first circulation component and accommodated in the elongated hole, and has a wall portion facing the tongue portion; and a higher strength pipe that is disposed in an abutting surface where the first and second circulation components abut against each other, constitutes a part of a ball circulation path.

Abstract: In a multi-row bearing, an inner ring raceway groove at one end portion in an axial direction is formed over groove shoulders on both sides in the axial direction with respect to a groove bottom, and an inner ring raceway groove at an intermediate portion in the axial direction is formed over a groove shoulder on one side in the axial direction from a groove bottom. In addition, an outer ring raceway groove at the other end portion in the axial direction is formed over groove shoulders on both sides in the axial direction with respect to a groove bottom, and an outer ring raceway groove at the intermediate portion in the axial direction is formed over a groove shoulder on one side in the axial direction from a groove bottom.

Abstract: A holder has a holder engagement portion in at least a position sandwiching a pad from both sides in a third direction orthogonal to both a first direction that is an urging direction of an elastic member and a second direction that is an axial direction of a worm accommodation portion. The pad has a pad engagement portion that comes into contact with the holder engagement portion on at least one of both side portions in the third direction. Based on contact between the holder engagement portion and the pad engagement portion, displacement of the pad in the third direction with respect to the holder is regulated.

Abstract: A clutch device includes an inner ring; an outer ring; a ratchet engagement mechanism; and a switching mechanism. When an engaging member is provided on an inner peripheral portion of the outer ring, a cam member includes a cam inner ring portion provided to rotate together with the inner ring, a cam outer ring portion disposed outside the cam inner ring portion, and a plurality of rolling elements disposed between the cam inner ring portion and the cam outer ring portion. When the engaging member is provided on an outer peripheral portion of the inner ring, the cam member includes a cam outer ring portion provided to rotate together with the outer ring, a cam inner ring portion disposed inside the cam outer ring portion, and a plurality of rolling elements disposed between the cam inner ring portion and the cam outer ring portion.

Abstract: A steering device includes a telescopic steering shaft that extends in a first direction, and a cylindrical outer steering column that rotatably supports the steering shaft. The steering column includes a lower column and an upper column having one end slidably attached to the lower column and the other end on which a bearing that supports the steering shaft is provided. The upper column includes a clamp that is externally slidably fitted to the lower column and that has a slit extending in the first direction, and a cylindrical part that has a cylindrical shape and that has one end continuous with the clamp and the other end blocked by the bearing being internally fitted. The cylindrical part has an air hole that is spaced apart from the one end of the cylindrical part and that penetrates an outer peripheral surface and an inner peripheral surface of the cylindrical part.

Abstract: Provided are: an environment-friendly synthetic resin cage that uses a 100% biomass raw material and therefore aims for carbon neutrality while having performance as a bearing in a conventional process; and a rolling bearing incorporating said cage. A crown-type cage for holding a plurality of rolling elements incorporated between an inner ring and an outer ring is produced with a polyamide resin composition containing a 100% biomass-derived raw material with a reinforcing material contained therein, wherein the raw material is polyamide 410 and 10-40 wt % of the reinforcing material is contained therein.

Abstract: A method of manufacturing a ball screw device includes a nut unit preparation step, a screw shaft preparation step, and an assembly step. In the nut unit preparation step, a nut unit is prepared in which a circulation component, a ball, and a temporary shaft that prevents the ball from falling off are assembled to a nut provided with an inner peripheral track surface. In the screw shaft preparation step, a screw shaft provided with an outer peripheral track surface is prepared. In the assembly step, after the nut unit preparation step and the screw shaft preparation step, the temporary shaft of an arbitrary nut unit is replaced with an arbitrary screw shaft to manufacture the ball screw device.

Abstract: A table device includes a ball screw including a male screw member extending in an axial direction and a female screw member meshing with the male screw member and movable in the axial direction according to rotation of the male screw member, a slide device that movably supports the female screw member, and a fixing member to which the slide device is fixed. The fixing member includes a first wall section extending in a first direction and a second wall section extending in a second direction crossing the first direction in a cross section including an axis of the male screw member.

Abstract: A vibration diagnosis device is configured to diagnose vibration of a diagnosis target on the basis of an input signal from outside. The vibration diagnosis device includes a vibration sensor configured to detect the vibration of the diagnosis target, a filtering unit configured to extract a prescribed wavelength band from a waveform of a signal detected by the vibration sensor, and an arithmetic processing unit configured to apply a frequency analysis to the filtered waveform, which is obtained by the filtering unit, to generate spectral data. When, on the basis of the input signal, the arithmetic processing unit does not generate the spectral data, the arithmetic processing unit calculates at least one fundamental vibration statistic from the waveform of the signal detected by the vibration sensor and diagnoses the presence/absence of an abnormality of the diagnosis target.

Abstract: [Problem] An object of the present invention is to provide a control apparatus of a steering system for vehicles that precisely compensates an influence of the friction generated in the turning mechanism and enables a vehicle to respond properly.

Abstract: A resolver integrated-type bearing device includes a bearing configured to rotatably support a rotating shaft with respect to a housing, a rotor attached to the rotating shaft, and a stator disposed radially outward of the rotor with a gap therebetween. A stator core of the stator is integrally attached to the bearing.

Abstract: A two-speed transmission includes: an input member; an output member; a rotating member; a first engaging device switching engagement between first and second friction plates to switch the input member and the rotating member to an integrally rotating state or a relatively rotating state; a second engaging device switching the rotating member to a rotatable or non-rotatable state; an elastic biasing means applying a force pressing the first and second friction plates; a pressing device releasing the pressing force; a first bearing between the elastic biasing means and the pressing device; a second bearing between the rotating member and the pressing device or the fixed portion; and a planetary speed reduction mechanism having a sun element connected to the input member or the rotating member, a carrier connected to one of the input member or the rotating member and the output member, and a ring element connected to the other.

Abstract: The torque transmission shaft has a shaft having a hollow tubular shape and a clamp. The shaft has a connecting portion integral with the shaft at one axial end portion, a slit extending in the axial direction in a portion on the other axial end side and opens on the other side in the axial direction, and a female serration on the inner circumferential surface of the other axial end portion. The clamp is separate from the shaft and has a non-continuous portion at one location in the circumferential direction, a pair of flange portions on both sides of the non-continuous portion, and a connecting portion connecting the pair of flange portions in the circumferential direction. The clamp is externally fitted and fixed to the other axial end portion of the shaft and reduces the diameter of the other axial end side portion of the shaft.

Abstract: A distance between a rotation center of an input member and a contact portion between an input side engaging portion and an input side engaged portion in a second direction is set to be shorter than a distance between a rotation center of an output member and a contact portion between an output side engaging portion and an output side engaged portion in the second direction. In a locked or semi-locked state, a contact portion between the output side engaging portion and the output side engaged portion is located on the side closer to the rotation center of the output member in a first direction in relation to a virtual line connecting the rotation center of the output member and a contact portion between one pressing surface of the pair of pressing surfaces and the pressed surface.

Abstract: Provided is a screw shaft in which shape accuracy of a male threaded portion is sufficiently secured. A screw shaft includes a large-diameter shaft portion, medium-diameter shaft portions and small-diameter shaft portions. The large-diameter shaft portion has a male threaded portion along its entire axial length on its outer peripheral surface. The medium-diameter shaft portions are arranged axially adjacent to the large-diameter shaft portion and have an outer diameter smaller than an outer diameter of the large-diameter shaft portion. The small-diameter shaft portions are axially arranged adjacent to the medium-diameter shaft portions on sides opposite to the large-diameter shaft portion, have an outer diameter smaller than the outer diameter of each of the medium-diameter shaft portions, and do not have rolling traces having a helical shape on their outer peripheral surfaces.

Abstract: A vehicle steering device includes a reaction force device, a drive device, a first ECU configured to control the reaction force device, a second ECU configured to control the drive device, a first rudder angle sensor and a second rudder angle sensor each configured to detect a steering angle of a wheel and output the detected steering angle to the second ECU, and a communication line that transmits at least one of steering angles of the wheel as detected values of the first rudder angle sensor and the second rudder angle sensor from the second ECU to the first ECU.

Abstract: An assembly for a steering column assembly including an engagement plate and a telescope plate at least partially disposed within the engagement plate. The engagement plate may be adapted to be located between a column tube of a steering column assembly and the telescope plate. The engagement plate and the telescope plate have one or more features for engaging with or contacting each other to provide energy absorption during an impact exceeding a threshold load. These features may include one or more projections or protrusions, one or more slots, one or more ribs, or a combination.