Nsk Corporation

Juntaro Sahara

Takanori Miyasaka

Hirotoshi Aramaki

Yasushi Mutoh

Toshikazu Yabe

Soichiro Kato

Hiroki Yamaguchi

Shinichi Natsumeda

Tatsunobu Momono

Yasushi Mutou

Masanobu Yamazoe

A abnormality diagnosing apparatus used in a machine equipment including a rotating or sliding part relative to a stationary member includes a detecting portionfixed to the rotating or sliding part or the stationary member and including a vibration sensorand a temperature sensor, and a signal processing portionfor determining a state of the part from a detecting signal outputted by the detecting portion. The signal processing portiondetermines presence or absence of a abnormality, or presence or absence of the abnormality and a degree of a damage of the part based on a combination of a measured result by the vibration sensorand a measured result by the temperature sensor

Abnormality diagnosing apparatus and abnormality diagnosing method

Provided are an envelope processor, for obtaining an envelope for a detected signal; a FFT unit, for converting the envelope into a frequency spectrum; a peak detector, for smoothing the frequency spectrum by calculating a moving average, for further performing smoothing and differentiation for the spectrum, and detecting, as peaks, frequency points at which a sign of a differential coefficient is changed from positive to negative, for extracting peaks having a predetermined threshold value or greater, and for sorting the extracted peaks and detecting upper peaks; and a diagnosis processor T, for diagnosing an abnormality based on the detected peaks.

Abnormality diagnosing system for mechanical equipment

An abnormality diagnosis system for diagnosing a presence or absence of an abnormality of a bearing unit for a railway vehicle axle, comprises a sensing/processing portion for outputting a signal generated from the bearing unit as an electric signal, a calculating/processing portion for making an abnormality diagnosis of the bearing unit based on an output of the sensing/processing portion, a result outputting portion for outputting a decision result of the calculating/processing portion, and a controlling/processing portion for feeding back a control signal to a control system of the railway vehicle based on the decision result.

Method and device for monitoring status of mechanical equipment and abnormality diagnosing device

A linear-motion device has: a linear-motion element fitted on a shaft which moves straight along the shaft; a plurality of balls which are retained in a ball groove formed on the inner side of the linear-motion element and roll over between the ball groove and the shaft; a separator interposed between the balls; and, a circulating path formed in the linear-motion element through which the balls are circulated from one end of the ball groove to the other, which is filled with a grease, wherein the separator is a formed product comprising as a resin component a polybutylene naphthalate-based elastomer formed by a hard segment made of a polybutylene naphthalate and a soft segment made of a polycondensate of 2,6-naphthalanedicarboxylic acid with a polytetramethylene ether glycol.

Linear-motion device and ball screw

In a case where crowning is provided on a contact surface of a tappet roller by the combination of, for example, two circular arcs, a logarithmic crowning is determined in which an edge load does not occur in the bearing pressure even if its inclination with respect to the cam is {fraction (5/1,000)} or thereabouts, and a crowning profile is set between two logarithmic crownings. In addition, the crowning profile is defined so as to be present between the logarithmic crownings in a case where the axial position x with the center in the direction of a bus set as an origin is at a position 0.85-fold and at a position 1.0-fold the half L,of the effective contact length, respectively.

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Kanagawa, Japan

Juntaro Sahara