Abstract: A driving device includes a corrector, an actuator, and a position sensor. The actuator includes a nut connected to a movable part, a ball screw shaft onto which the nut is screwed, and a pulse motor that drives to rotate the ball screw shaft. The corrector includes a correction amount map in which a position correction amount for calibrating a predictable error is mapped for each position of the movable part. The corrector estimates an ideal movement position to which the movable part moves based on a command signal and refers to the correction amount map to calculate the position correction amount corresponding to a present position detected by the position sensor. The corrector generates a correction signal by correcting the command signal so as to reduce the difference between a corrected present position obtained by correcting the present position by the position correction amount and the ideal movement position.

Abstract: A turning control device includes a terminal position learning unit configured to learn a terminal position of the turning mechanism, based on a steered position of the turning mechanism detected by a position detection unit, a command value correction unit configured to, when a steered position detected by the position detecting unit is in a vicinity of a learned terminal position, correct a current command value for an actuator providing a turning mechanism with steering assist force, and a correction amount limiting unit configured to limit a correction amount of the current command value by the command value correction unit, based on a comparison result between the learned terminal position and a predetermined position and a comparison result between stroke length of the turning mechanism calculated from the learned terminal positions and a predetermined length.

Abstract: A terminal position learning unit includes a first storage unit configured to store a steered position positioned farthest from a neutral position of a turning mechanism within a range of a steered position detected by a position detection unit when rotational force applied to the turning mechanism is less than or equal to a first predetermined value, a second storage unit configured to store a steered position positioned farthest from the neutral position within a range of a position to which a steered position detected by the position detection unit is shifted in a direction toward the neutral position by a second predetermined value, and a third storage unit configured to store, as a terminal position stored by the terminal position learning unit, one of the steered positions stored in the first storage unit and the second storage unit positioned farther from the neutral position than the other.

Abstract: The reverse input cutoff clutch includes: a pressed member having a pressed surface around the inner peripheral surface; an input member coaxially arranged with the pressed surface and having an input-side engaging portion arranged on the radially inner side of the pressed surface; an output member coaxially arranged with the pressed surface and having an output-side engaging portion arranged further on the radially inner side than the input-side engaging portion; and an engaging element arranged so as to be movable in a first direction as a direction toward or away from the pressed surface on the radially inner side of the pressed surface. The engaging element has a main engaging element body having a pressing surface and a pivot-support shaft, and a link member. The link member has a first end portion pivotally linked to the pivot-support shaft, and a second end portion pivotally linked to the input-side engaging portion.

Abstract: A wheel and a vehicle each having a simple structure and capable of moving over a step while maintaining stability at flat ground traveling are provided. A wheel includes an outer ring that rotates about a wheel rotational axis, an arm drive gear that rotates independently from the outer ring about the wheel rotational axis, and an arm capable of rotating about an arm rotational axis fixed to the outer ring, the arm being configured to partially protrude outside from an outer peripheral surface of the outer ring in a radial direction as the arm drive gear rotates relative to the outer ring in one direction (normal rotational direction) and to be housed inside in the radial direction from the outer peripheral surface of the outer ring as the arm drive gear rotates relative to the outer ring in the other direction (reverse rotational direction) opposite to the one direction.

Abstract: An electrically adjustable steering device includes a top bracket fixed to a vehicle body, a steering shaft to which a steering wheel is connected, a steering jacket which is held by the top bracket and rotatably supports the steering shaft inside, a tilt actuator which adjusts a tilt of the steering jacket, and a link member which is pivotably supported by the top bracket, the steering jacket, and the tilt actuator. The tilt of the steering jacket can be adjusted by transmitting power of the tilt actuator to the steering jacket via the link member. The link member is placed only on one side of the steering jacket in a vehicle left-right direction.

Abstract: Axial relative movement of an auxiliary member (30) and a hub body (22z) is performed, the hub body (22z) and an inner race (21) are combined with each other in an axial direction, and a part of the hub body (22z) deformed by a blade (33) of the auxiliary member (30) is disposed inside an engagement concave portion (26) of the inner race (21).

Abstract: The rotation transmission state switching device comprises a clutch device comprising a first rotating member having a first-rotating-member-side engaging portion, a second rotating member having a second-rotating-member-side engaging portion, a third rotating member having a third-rotating-member-side engaging portion; and an engaging element having an engaging-element-side first engaging portion engaging with the first-rotating-member-side engaging portion, an engaging-element-side second engaging portion engaging with the second-rotating-member-side engaging portion, and an engaging-element-side third engaging portion engaging with the third-rotating-member-side engaging portion; and a restriction device configured to switch between allowing and restricting rotation of the first rotating member, allowing or preventing torque transmission between the second rotating member and the third rotating member.

Abstract: A bar portion is formed so that an outer circumferential surface on a tip portion side is located on an inner diameter side with respect to an outer circumferential surface of a main portion. On an inner diameter side of a cage, lightened portions obtained by notching in an axial direction from an axial side surface of the main portion are formed separately at positions of the respective bar portions in a circumferential direction. Each lighting portion is formed separately from a surface of a pocket and an axially outer surface of the bar portion formed between a pair of claw portions. An axial dimension T1 of a wall portion formed between an axially outer surface of the bar portion and an inner wall surface of the lightened portion is greater than an axial dimension T2 of the main portion on a bottom portion of the pocket.

Abstract: A wireless power reception system 1 includes: a power reception device 5 including a power reception coil 51 that receives power supplied wirelessly from a power transmission coil 41 of a power transmission device 4 installed in a road surface, at least a portion of the power reception coil 51 being housed in a wheel 3 of a moving body 2; and an onboard device 6 which is installed in the moving body 2 and which is electrically connected to the power reception device 5, wherein the power reception device 5 can transmit received power to the onboard device 6, and the power reception coil 51 has a convex shape pointing downward in a side view as seen from an axial direction of the wheel 3.

Abstract: A wireless power transfer system 1 includes a power transmission device 2 and a power reception device 3. The power transmission device 2 is a power transmission device 2 installed in a road 4, is provided with a power transmission coil 21 that transmits power wirelessly, and is configured such that when installed in the road 4, the normal line of a coil plane of the power transmission coil 21 is inclined with respect to the normal line of the road surface of the road 4 in a lateral cross section of the road 4. The power reception device 3 is provided with a power reception coil 31 that receives power wirelessly, and at least a portion of the power reception coil 31 is housed in the wheel 6 of the moving body 5.

Abstract: A wireless power reception system 1 includes: a power reception device 5 including a power reception coil 51 that receives power supplied wirelessly from a power transmission coil 41 of a power transmission device 4 installed in a road surface, at least a portion of the power reception coil 51 being housed in a wheel 3 of a moving body 2; and an onboard device 6 which is installed in the moving body 2 and which is electrically connected to the power reception device 5, wherein the power reception device 5 can transmit received power to the onboard device 6, and the power reception coil 51 includes a stacked plurality of spiral coil layers 52a and 52b.

Abstract: In the ball screw device, the circulation path that returns balls from the end point to the start point of the load path includes a return path, scooping paths, and connecting paths. The scooping path has an arc-shaped center line that is curved outward in the radial direction as going toward the reference imaginary flat plane including the center axis of the screw shaft and the center line of the return path in the circumferential direction. The connecting path is arranged on the reference imaginary flat plane and includes a straight path having a linear center line extending in a direction orthogonal to the center axis of the screw shaft. When the radius of curvature of the center line of the scooping path is R1, the scooping angle is ?, and the entire length of the straight path is S, R1 cos(90°??)+S is made larger than the diameter of the balls.

Abstract: A generatrix shape to which crowning is applied includes a first generatrix shape which is formed in a central portion in an axial direction of at least one of an outer ring raceway surface, an inner ring raceway surface, and a rolling surface of a roller and is composed of a straight line, a pair of second generatrix shapes which are formed from both ends in the axial direction toward the outside in the axial direction of the first generatrix shape and are composed of a single arc curve, and a pair of third generatrix shapes which are formed from both ends in the axial direction toward the outside in the axial direction of the second generatrix shape and are composed of a composite curve of a single arc curve and a logarithmic curve.

Abstract: To provide an electric driving device and an electric power steering device with a smaller area of power supply wiring in a circuit board and higher reliability of the circuit board. An electric driving device includes a motor and an electronic control unit that controls rotation of the motor. The electronic control unit includes a first circuit board, a second circuit board, a power supply wiring module, and a heat sink. The first circuit board is provided with a transistor that outputs an electric current to excite a motor coil. The second circuit board includes a control circuit that controls an electric current supplied to the transistor. The power supply wiring module is configured by molding, with resin, a choke coil for noise removal, a capacitor, and wiring that supplies electric power to at least one of the first circuit board and the second circuit board. The heat sink is sandwiched between the power supply wiring module and the second circuit board.

Abstract: The power management unit supplies first power that is continuous power to the second sensor when the power switch is on, supplies second power that is intermittent power having a voltage lower than the first power to the second sensor when the power switch is off, and outputs rotation number information representing a rotation number of the motor rotation shaft based on the second sensor signal. The power management unit includes a comparator that operates using the second power as the power source when the power switch is off and compare the second sensor signal and the reference voltage, and a counter that detects the rotation number of the motor rotation shaft by counting the output of the comparators.

Abstract: A seal ring (26) configured to be employed with a cross shaft (16) including a center section (17) and four shaft sections (18a, 18b, 18c, 18d) extending in four directions from the center section and formed with step faces (17a) where the center section widens out from base ends of the shaft sections outward in radial directions of the shaft sections, and with bearings (21) for mounting to leading end portions of the shaft sections. The seal ring is fitted over the shaft section and interposed between the bearing and the step face. The seal ring includes a seal lip (34) configured to contact the step face around the entire circumference, and an indentation (36) the seal lip enters by deforming when mounted to the cross shaft.

Abstract: A state determination device for a hub unit bearing includes: a holding unit that holds reference information of magnetic characteristics at a predetermined position in the vicinity of a flange portion included in the hub unit bearing; an acquisition unit that acquires measurement information of the magnetic characteristics at the predetermined position of the hub unit bearing; a derivation unit that derives a change amount between the reference information held by the holding unit and the measurement information acquired by the acquisition unit; and a determination unit that determines a state of the hub unit bearing based on the change amount derived by the derivation unit. The predetermined position is a position at which the magnetic characteristics vary with a stress change with respect to the flange portion.

Abstract: A bracket includes a first plate that faces a steering column, a second plate that faces a column cover covering the steering column, and a third plate that connects the first plate and the second plate, and a fourth plate that intersects with the first plate and the third plate.

Abstract: Provided is a friction design method capable of estimating sliding friction generated between mutual sliding surfaces of two sliding members lubricated with lubricant with high precision. The friction design method sets a friction coefficient ? in a sliding surface model corresponding to mutual sliding surfaces of two sliding members (2 and 3) lubricated with lubricant (step S1), and, based on a correlation between the friction coefficient ? and an oil film parameter (?(Rk) or ?(Rk+Rpk)) calculated using a core portion level difference (Rk) or a sum of the core portion level difference (Rk) and reduced peak height (Rpk) as a parameter representing surface roughness in the sliding surface model (step S2), sets a target value for surface roughness of the sliding surfaces required to be controlled as a product (steps S3 to S6).