Abstract: The nut according to the present disclosure includes a nut main body and a circulation component. The nut main body includes a housing part having a bow shape when viewed from an axial direction, a seat surface forming a bottom surface of the housing part, a through hole passing through the seat surface, and a pair of side surfaces arranged on both sides in the axial direction with respect to the housing part.

Abstract: Each of column portions has a first branch portion and a second branch portion bifurcated in the circumferential direction at one end portion in the axial direction, and a grease storage groove between the first and second branch portions, a tip-end portion of the first branch portion of one column portion and a tip-end portion of the second branch portion of an adjacent column portion are connected in the circumferential direction, and a tip-end portion of the second branch portion of the one column portion and a tip-end portion of the first branch portion of another adjacent column portion are connected in the circumferential direction.

Abstract: There is provided a method for evaluating the cleanliness of a steel material by an ultrasonic flaw detection method enabling rapid acquisition of highly reliable data. Ultrasonic flaw detection is performed to detect a flaw in at least one part in the range of 90% or more and 100% or less of a steel material (for example, round bar 2) at a radial position where the center of the steel material is set as 0% and the surface is set as 100%, and then the cleanliness is evaluated based on the dimension and the number of inclusions in the steel material obtained by the ultrasonic flaw detection.

Abstract: A rolling bearing (10) includes: an outer ring (1) having an outer ring track surface (1a); an inner ring assembled to the outer ring (1) and having an inner ring surface (3a) opposite to the outer ring track surface (1a); and a plurality of rolling elements (5) rotatably incorporated between the outer ring track surface (1a) and the inner ring track surface (3a), in which the rolling element (5) is made of stainless steel, and the surface roughness Ra of the rolling element (5) is 0.01 ?m or less.

Abstract: An application position of a processing force directed radially outward is continuously changed in the circumferential direction of a cylindrical portion (25) while applying the processing force to a part of the cylindrical portion (25) of a hub main body (21) in the circumferential direction. An application position of a processing force directed radially inward is continuously changed in the circumferential direction of a staking portion intermediary body (41) while applying the processing force to a part of the staking portion intermediary body (41) in the circumferential direction.

Abstract: A motor includes a housing including a housing base and a housing shaft portion that is provided on the housing base and extends in a direction along a rotation center axis, a motor stator that is disposed outward in a radial direction of the housing shaft portion, a motor rotor that is provided between the motor stator and the housing shaft portion, a bearing that is provided inward in a radial direction of the motor rotor and rotatably supports the motor rotor to the housing shaft portion, a sealing structure that is provided on an opposite side to the housing base in an axial direction of the motor rotor and seals between the motor rotor and the housing shaft portion, and a resolver that is configured to detect rotation of the motor rotor.

Abstract: A linear motion actuator has a ball screw device having a screw shaft, a nut, and a plurality of balls, a piston mounted on one end of the screw shaft, and a stroke limiting mechanism setting an operation starting point in time of the screw shaft toward a first direction pointed by the one end. The nut has one end face directed to the first direction and a protruding part protruding from the one end face.

Abstract: A current detection device includes a current detection unit configured to detect current flowing through a switching element of a lower-side arm; a correction value calculation unit configured to calculate an offset correction value, based on a detection value of the current detected by the current detection unit in a period during which the switching element off during PWM control, and to hold and update the calculated offset correction value; and a correction unit configured to correct, by the offset correction value held by the correction value calculation unit, the detection value of the current detected by the current detection unit in a period during which the switching element is on. The correction value calculation unit is configured to not update the offset correction value in a case where a duty ratio of the PWM control is equal to or less than a duty ratio lower limit value.

Abstract: A magnetostrictive torque sensor, configured to be mounted around a rotating shaft having a magnetostrictive effect and to detect torque applied to the rotating shaft, is provided with a support member having a cylindrical portion through which the rotating shaft is inserted; a flexible substrate arranged around an outer periphery of the cylindrical portion and having a plurality of coils composed of wiring patterns; and a tightening member that tightens the flexible substrate toward an outer peripheral surface of the cylindrical portion. The tightening member may be a tubular heat-shrinkable tube that shrinks upon heating.

Abstract: A steering device includes: an upper column having a cylindrical shape that is disposed on a radially outer side of a steering shaft; a lower column having a cylindrical shape that is fitted to the upper column and is capable of relatively moving in an axial direction with respect to the upper column; an attachment portion that is attached to the upper column and provided with a column long hole; a column bracket that includes a side plate portion located on a side of the upper column and is attached to a vehicle body; a liner slot that is inserted into the column long hole of the attachment portion and restricts an axial movement; and a pin that extends along a vehicle width direction and penetrates through the side plate portion and the liner slot, in which the liner slot is provided with a through-hole through which the pin penetrates.

Abstract: The steering device includes a steering shaft, a steering column, a bracket, and a fastening mechanism. The steering column includes a lower column and an upper column. The upper column includes a clamp, a cylindrical part, a pair of protrusions, and a reinforcement rib that extends across an outer peripheral surface of the clamp and an outer surface of one of the protrusions. The clamp includes a continuous clamp positioned near the cylindrical part and a spaced clamp spaced apart from the cylindrical part. The protrusions include a continuous protrusion that protrudes from the continuous clamp, and a spaced protrusion that protrudes from the spaced clamp. The reinforcement rib linearly extends from the spaced protrusion toward the continuous clamp.

Abstract: A drive wheel in which the rotational axial center of a wheel along the vertical direction intersecting the axial center of the axle is arranged shifted in the horizontal direction orthogonal to the axial center of the axle with respect to the axial center of the pivot shaft. When a radius R1 of the wheel, center distance R2 between the rotational axial center and the axial center of the pivot shaft, rotational frequency n1 of the wheel, rotational frequency n2 of the pivot shaft, rotational speed V1 of the wheel, and steering rotational speed V2 of the wheel rolling on a floor surface while turning the pivot shaft satisfy V1=V2, relations of V1=2?×R1×n1, V2=2?×R2×n2, and n1=n2 (R2/R1) are satisfied.

Abstract: A steering column device includes a steering column; and a telescopic actuator. The steering column includes a first column member, a second column member assembled to the first column member in a manner of being displaceable relative to the first column member in an axial direction, and a low-friction sliding member disposed between the first column member and the second column member. The telescopic actuator includes a telescopic motor, and displaces the second column member in the axial direction with respect to the first column member by using the telescopic motor as a drive source.

Abstract: A method of manufacturing a magnetostrictive torque sensor shaft (100) to which a sensor portion (2) of a magnetostrictive torque sensor (1) is mounted. The method includes heat treatment step of subjecting an iron-based shaft member to a carburizing, quenching, and tempering process, and a shot peening step of performing shot peening using a boron-free zirconia shot media having a Vickers hardness at least equal to 1100 and at most equal to 1300, at least in a position on the shaft member, after the heat treatment step, to which the sensor portion is to be attached. The surface of the shaft member, after shot peening, has a total error, including hysteresis error and angle error, of not more than 3%.

Abstract: A rolled thread screw includes: a screw part having, on an outer circumferential part of the screw part, thread crests and thread grooves disposed alternately along an axial direction of the rolled thread screw; and a columnar part adjoining at least one of both sides of the screw part in the axial direction. An axial end surface of the columnar part is provided with: a first concave surface concave in the axial direction; a second concave surface positioned to an outer circumference of the first concave surface and being concave in the axial direction; and a salient part positioned on a boundary between the first concave surface and the second concave surface and projecting further than a bottom of the first concave surface and a bottom of the second concave surface, the salient part extending in an arc-like shape along a circumferential direction of the columnar part as viewed in the axial direction.

Abstract: [Problem] To provide a linear motion device using a highly reliable and environmentally friendly separator that improves a dimensional stability, ductility, and adhesion of greases based on poly-?-olefin oil, which are required for separators, and also prevents deformation at high speeds. [Solution] Provided is a linear motion device including a linear motion body (15) that is fitted onto a screw shaft (11) and moves straight along the screw shaft (11), a large number of balls (B) held in a ball groove (14) formed on an inner surface side of the linear motion body (15) and rolling between the ball groove (14) and the screw shaft (11), a separator (100) interposed 10 between each ball (B), a circulation passage (18) formed in the linear motion body (15) and circulating the ball (B) from one end side of the ball groove (14) to the other end side, where at least one of the separator (100) and the circulation passage (18) is formed from polyamide 410 by injection molding.

Abstract: The nut has a first fitting surface provided with a first retaining ring groove on an end portion on the other side in the axial direction; the fitting cylinder, at an end portion on the one side in the axial direction, has a second fitting surface provided with a second retaining ring groove in a portion facing the first retaining ring groove with regard to a radial direction; and the retaining ring is engaged so as to span between the first retaining ring groove and the second retaining ring groove.

Abstract: A ball screw device has a screw shaft that has a screw portion having a spiral-shaped shaft-side ball screw groove on an outer peripheral surface thereof, and a carrier integrally formed with the screw portion and constituting a planetary speed-reducing mechanism; a nut that has a spiral-shaped nut-side bass screw portion on an inner peripheral surface thereof; a plurality of balls arranged between the shaft-side ball screw groove and the nut-side ball screw groove; and a rolling bearing for supporting the carrier which has an outer ring having an outer ring raceway, an inner ring raceway provided on a portion facing the outer ring raceway in a radial direction, and a plurality of rolling bodies arranged between the outer ring raceway and the inner ring raceway, which is directly formed on an outer peripheral surface of the carrier.

Abstract: A steering device includes: a steering shaft which extends along a central axis and to which a steering wheel is coupled on one side in an axial direction; a tubular steering column which is disposed on an outer circumferential side of the steering shaft and extends in the axial direction; and a gearbox which is disposed on the other side in the axial direction of the steering column and is fixed to the steering column. The steering column includes a fixing member provided at an end on the other side in the axial direction and fixed to the gearbox, and an outer circumferential surface on one side in the axial direction of the fixing member has an outer diameter which increases toward the other side in the axial direction.