Abstract: Provided are a rolling bearing that can be used in a highly clean environment, can prevent deterioration of grease used as a lubricant, and can reduce the amount of dust generated not only before decontamination but also after decontamination with hydrogen peroxide or the like, and an actuator including the rolling bearing. A rolling bearing (1) is filled with grease containing a base oil and a thickener. The base oil contains a fluorine oil, and the thickener contains polytetrafluoroethylene resin powder. A worked penetration of the grease is 200 or more and 295 or less.

Abstract: A remaining life of a bearing is appropriately predicted. A bearing remaining life diagnosis method for predicting a remaining life of a rolling bearing used in a rotary machine and having inner and outer bearing rings and rolling elements between both the bearing rings includes a step of calculating a latest estimated peeling length, and a step of calculating a latest remaining life of the bearing based on a latest peeling length of the bearing ring. The step of calculating the latest estimated peeling length includes a step of calculating a maximum rolling element load, a step of calculating a maximum contact surface pressure from the maximum rolling element load, and a step of calculating the latest estimated peeling length of the bearing ring from the maximum contact surface pressure of the bearing ring.

Abstract: A state monitoring apparatus for a mechanical apparatus including a rolling bearing includes: a first acquisition portion configured to acquire vibration information or sound information of the rolling bearing during rotation; a second acquisition portion configured to acquire a rotation speed of the rolling bearing during rotation; a derivation portion configured to derive, according to the rotation speed, a timing at which data is sampled from the vibration information or the sound information such that the number of times of sampling per rotation of the rolling bearing is a predetermined value; and a generation portion configured to generate, based on the timing derived by the derivation portion, monitoring data by sampling data from the vibration information or the sound information.

Abstract: A ball screw device of the present disclosure includes a nut, a screw shaft, balls, and at least one deflector. An outer peripheral surface of the screw shaft is provided with at least one recess that accommodates the deflector. On an inner peripheral surface of the recess, two screw shaft openings are provided in an outer peripheral raceway surface, and the screw shaft openings are opened toward the deflector. The deflector includes a pair of deflector openings opened in an outer peripheral surface of the deflector and connected to the screw shaft openings, a circulation groove surface connected to each deflector opening and having an internal space forming a circulation pathway, and a pair of tongues disposed radially outside the circulation groove surface and protruding toward the deflector openings. A tip of the tongue is disposed radially outside a virtual spiral connecting centers of the balls rolling on the raceway.

Abstract: A magnetostrictive torque sensor is configured to be attached around a rotating shaft exhibiting a magnetostrictive effect and detects torque transmitted by the rotating shaft. The magnetostrictive torque sensor includes a holder being composed of a resin and including a cylinder portion with a hollow cavity in a center through which the rotating shaft is inserted, a flexible substrate that includes a detection portion on which a coil group composed of a combination of a plurality of detection coils aligned in a predetermined direction is formed by a wiring pattern, and a signal line portion on which a plurality of signal lines electrically connecting the coil group to an external device are formed by a wiring pattern, and a cylindrical magnetic ring being composed of a soft magnetic material and being arranged around an outer circumference of the cylinder portion of the holder.

Abstract: A ring-shaped member (25) having a raceway groove (25d) formed on an inner circumferential surface or outer circumferential surface is prepared. The ring-shaped member (25) is supported using a support member (31). A central axis of the ring-shaped member (25) is disposed horizontally, and the support member (31) comes into contact with a groove bottom surface of the raceway groove (25d) to support a weight of the ring-shaped member (25). A height position of a movable probe (43) is measured in a state in which the movable probe (43) is placed on the groove bottom surface. A groove diameter of the raceway groove (25d) is calculated based on a measurement result of the height position of the movable probe (43).

Abstract: A first piece (13) includes a first ring portion (13b) and a second ring portion (13c) which are arranged side by side in an axial direction and an inner diameter and an outer diameter of the first ring portion (13b) are respectively larger than an inner diameter and an outer diameter of the second ring portion (13c). A second piece (16) is obtained by pressing the first piece (13) while the first piece (13) is disposed between a first set and a second set.

Abstract: A traveling assistance device includes: a driving wheel supported by a device main body; a speed acquisition unit configured to acquire information on a speed and an angular speed of the device main body; a connection portion connected to a traveling tool; a driving force acquisition unit configured to acquire a driving force of the driving wheel; and a controller. The controller is configured to: calculate a frictional force of the driven wheel based on the driving force while an external force is not applied to the traveling tool; when the speed of the device main body is a predetermined threshold or higher, execute a control such that the driving wheel travels with a driving force against the frictional force; and when the speed of the device main body is lower than the predetermined threshold, execute a control such that the driving force of the driving wheel is zero.

Abstract: A lubricant supply control method for a device that lubricates a plurality of portions using a lubricant includes: measuring an impedance of an electric circuit including the plurality of portions by applying an AC voltage to the electric circuit; deriving an oil film thickness and a breakage rate of an oil film between the plurality of portions based on the measured impedance; and controlling at least one of a supply amount and a supply timing of the lubricant to the device based on the derived oil film thickness and breakage rate of the oil film so that a lubrication state between the plurality of portions becomes a predetermined lubrication state.

Abstract: A state monitoring method for a mechanical device, performing a rotation operation, includes: an acquisition step of acquiring rotational speed data and vibration data during the rotation operation of the mechanical device; a conversion step of converting the vibration data from a time domain to an angle domain using the acquired rotational speed data and the acquired vibration data; a reconversion step of reconverting the converted vibration data into a time domain based on a predetermined reference speed; and a diagnosis step of diagnosing a state of the mechanical device using the converted vibration data, in which in the conversion step, when the rotational speed data includes a section in which a rotational speed is zero or substantially equal to zero, the rotational speed data is corrected such that the rotational speed fluctuates in the section, and then the vibration data is converted into an angle domain.

Abstract: A probe includes a substantially columnar probe main body configured to detect an impedance of a bearing by coming into contact with a measurement target surface of the bearing, a housing having therein a sliding hole extending in an axial direction, the housing being configured to accommodate the probe main body disposed in the sliding hole, an abutting portion provided at a distal end portion of the housing and configured to abut against the measurement target surface of the bearing, and a biasing spring disposed in the sliding hole of the housing and configured to bias the probe main body in the axial direction with respect to the housing, the abutting portion includes four protrusions protruding in the axial direction, and when viewed from the axial direction, the four protrusions are respectively positioned at vertices of a rectangle centered on a central axis of the probe main body.

Abstract: The rotational support device for flying object has a stationary body having double-row outer ring raceways, each of which is of an angular type, on an inner circumferential surface thereof, a rotating body having double-row inner ring raceways, each of which is of an angular type, on an outer circumferential surface thereof, and capable of supporting a propeller of a flying object on a first side in an axial direction, and balls arranged between the double-row outer ring raceways and the double-row inner ring raceways in a state where a back-to-back contact angle is applied to each row of the balls. A pitch circle diameter of first balls of the balls arranged on the first side in the axial direction and a pitch circle diameter of second balls of the balls arranged on a second side in the axial direction are different from each other.

Abstract: A flange integrated with an inner ring is formed at one end of the inner ring in an axial direction, and a flange member separate from the inner ring is fastened to a fastening member extending in the axial direction at the other end of the inner ring in the axial direction, and the flange member includes a base abutting against the inner ring in the axial direction and on which a head of the fastening member is seated, and a caulking portion pressing the head of the fastening member from the other end side in the axial direction.

Abstract: A press-formed product manufacturing method includes obtaining a first piece (19, 55) by punching a metal material, obtaining a second piece (28, 50) by comprising an edge of a second surface (8) of the first piece (19, 53) sandwiching the first piece (19, 55) between a first die (25) and a second die (26), and trimming a second piece (28) by using press working.

Abstract: A reverse-input blocking clutch includes a leaf spring having: two held portions that is arranged on both sides of an input-side engaging portion of an input member with respect to a second direction perpendicular to a first direction which is a direction of movement of a pressing surface of an engaging element moving away from or toward a pressed surface of a pressed member and a center axis of the input member, and elastically held between the input-side engaging portion and an input-side engaged portion of the engaging member; and a base portion that connects the two held portions.

Abstract: A rotation angle sensor including: a magnet fixed to an end on an opposite side to an output end of a rotation shaft of a motor; a circuit board on which a plurality of magnetic resistance sensor elements are mounted; and a support member fixed to the motor, wherein the circuit board is arranged between the support member fixed to the motor and the motor and is fixed to the support member in such a way that the plurality of magnetic resistance sensor elements come close to the magnet.

Abstract: An abnormality diagnosis device for a ball screw includes a vibration sensor that detects vibration during an operation of the ball screw, a filter processing unit that executes, on a vibration signal acquired by the vibration sensor, filtering processing for extracting a frequency band including at least a characteristic frequency corresponding to a specific frequency of the ball screw, an envelope processing unit that executes envelope processing for a vibration signal after the filtering processing, a frequency analysis processing unit that executes fast Fourier transform processing on a time domain signal after the envelope processing, a peak hold averaging processing unit that executes peak hold averaging processing for frequency domain data for each sampling period in the fast Fourier transform processing, and an abnormality determination unit.

Abstract: A measurement method for measuring a state of a device in which lubrication between components is performed by a lubricant, the method including: applying an AC voltage to an electric circuit formed of the components to be lubricated by the lubricant; measuring an impedance of the electric circuit and a phase angle at the time of applying the AC voltage; and deriving an oil film thickness and a metal contact ratio between the components based on the impedance and the phase angle, in which the oil film thickness and the metal contact ratio between the components are derived by using a calculation formula in which a capacitance of the contact region is defined by a probability density function of a surface roughness between the components in a contact region between the components.

Abstract: A water intrusion detection method for detecting intrusion of water into a lubricant in a device in which a plurality of portions are lubricated using the lubricant, includes: measuring an impedance of an electric circuit including the plurality of portions by applying an AC voltage to the electric circuit while sweeping a frequency; and detecting the intrusion of water into the lubricant by comparing characteristics indicated by a real part and an imaginary part of an impedance measured in a state in which water is not mixed into the lubricant with characteristics indicated by a real part and an imaginary part of the impedance measured by the measurement.

Abstract: A two-speed transmission includes a learning function performing mode switching between a first mode and a second mode on a condition that a predetermined learning start condition is satisfied, and, in an inertia phase during the mode switching, calculating a friction coefficient between a first friction plate and a second friction plate based on output torque of a drive motor and angular acceleration of an output shaft of the drive motor, and obtaining a ?-V characteristic that is a relationship between the friction coefficient and a differential rotation V that is a difference in the rotational speed of any two elements of a planetary transmission mechanism.