Abstract: A nondestructive inspection apparatus includes a focused ultrasonic probe which transmits burst waves to a surface of a spherical body in water, a signal output portion which outputs the burst waves to the focused ultrasonic probe, a probe position changing mechanism which rotates the spherical body arranged in water so as to change a position at which the burst waves from the focused ultrasonic probeare incident, and a signal detection portion which detects a harmonic waveform generated when a closed crack or a metal inclusion oscillates by waves excited in the spherical body by the burst waves through mode conversion. A closed crack or a metal inclusion in the vicinity of a surface of the spherical body can thus be detected and imaged as necessary.

Abstract: A rotation method includes bringing a conical first cone having a first rotation shaft into contact with a spherical body to be rotated at a first contact point of the spherical body from a first direction along the first rotation shaft and bringing a conical second cone having a second rotation shaft into contact at a second contact point different from the first contact point of the spherical body from the first direction and rotating the spherical body around an axis extending in a direction along a line segment which connects the first contact point and the second contact point to each other while the first cone and the second cone are relatively pressed against the spherical body from the first direction.

Abstract: Provided is a bearing device with a sealing device, including an inner ring (12), an outer ring (14), rolling elements (16) interposed between a raceway (12a) of the inner ring (12) and a raceway (14a) of the outer ring (14), a cage (18) for retaining the rolling elements (16) at predetermined intervals in a circumferential direction of the bearing device, and a sealing device (S2) removably mounted between the inner ring (12) and the outer ring (14). The sealing device (S2) includes an outer ring-side member (30) mounted on the outer ring (14), an inner ring-side member (40) mounted on the inner ring (12), and an elastic layer (44a) interposed at a fitting portion between the inner ring-side member (40) and the inner ring (12), for reducing a dimensional change of an inner diameter of the inner ring (12).

Abstract: A railroad vehicle bearing malfunction sensing system which is able to accurately determine a malfunction of an axle bearing in each vehicle of a train. The system includes: a plurality of data loggers mounted on a plurality of axle bearings, respectively, in at least one vehicle of a single-line train, each logger including: a detection/recording to detect vibration of the bearing and record detected vibration detection data; and a wireless communication to receive a recording start command for starting recording of the vibration detection data by the detection/recording; and a simultaneous recording start command to simultaneously and wirelessly transmit recording start commands to the loggers respectively corresponding to the bearings.

Abstract: A steel ball rolling configuration and a constant velocity universal joint have a superior oil retention effect between a surface of a steel ball and a partner rolling surface, and can form a thick oil film, improve lubrication, and extend life of the steel ball. The constant velocity universal joint includes a rolling surface and a steel ball that is lubricated by grease and rolls over the rolling surface. A surface roughness of the steel ball is roughened to become more similar to a surface roughness of a partner rolling surface. Numerous miniscule recesses roughly tens of micrometers in size are randomly disposed on the surface of the steel ball.

Abstract: The present invention provides a steel ball rolling configuration and a constant velocity universal joint that achieve a superior oil retention effect between a surface of a steel ball and a partner rolling surface, can form a thick oil film, improve lubrication, and extend life of the steel ball. The constant velocity universal joint of the present invention includes a rolling surface and a steel ball 7 that is lubricated by grease and rolls over the rolling surface. A surface roughness of the steel ball 7 is roughened to become more similar to a surface roughness of a partner rolling surface. Numerous miniscule recesses 15 roughly tens of micrometers in size are randomly disposed on the surface of the steel ball 7.