Nsk Corporation

Yasushi Mutoh

Tatsunobu Momono

Takanori Miyasaka

Shigeru Endo

Ikunori Sakatani

Takeshi Takizawa

Yasuhisa Terada

Magozou Hamamoto

Hiroshi Ishiwada

Banda Noda

Juntaro Sahara

Eiichi Takahashi

Takashi Ogawa

Michiharu Naka

Takashi Murai

Akira Suzuki

Hirotoshi Aramaki

Hideki Koizumi

Kiyoshi Hirakawa

Toshihisa Ohata

Youichiro Sugimori

Jiami Pu

Kenji Okuma

Minoru Kohari

Katsunori Yanase

Shinichiro Asaeda

Masanobu Yamazoe

Setsu Kawaguchi

Tatunobu Momono

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 anomaly diagnosis apparatus for analyzing sound or vibration data produced by a machine installation and diagnosing the presence or absence of an anomaly in a sliding member in the machine installation which is made up of a diagnosis processing server () and a user information processing terminal () which are connected through a network (). The diagnosis processing server () receives the sound or vibration data produced by the machine installation and information for identifying the sliding member used with the machine installation through the network () from the user information processing terminal, makes an anomaly diagnosis of the machine installation based on the received data, and transmits the diagnosis result through the network () to the user information processing terminal (), thereby lightening the burden of the user and executing anomaly diagnosis processing promptly.

Anomaly diagnosis apparatus and method of machine installation

A sensor unit is supported on a stationary ring which does not rotate even when it is in use, and the rotation of the rotary ring can be detected by a rotation detecting sensor held within the sensor unit. Within the sensor unit, besides the rotation detecting sensor, there are disposed other sensors such as a temperature sensor and a vibration sensor, thereby being able to detect the rotation speed and the rotation number of the wheel supported on the rotary ring, and the other car driving conditions.

Wheel rotation detecting device

A wheel rotation detecting device including a sensor unit that is supported on a stationary ring which does not rotate even when the wheel is in use, and the rotation of the wheel that is attached to a rotary ring can be detected by a rotation detecting sensor held within the sensor unit. Within the sensor unit, in addition to a rotation detecting sensor, there are disposed other sensors such as a temperature sensor and a vibration sensor, thereby allowing detection of the rotation speed and the rotation number of the wheel supported on the rotary ring, as well as detection of other car driving conditions.

A ball bearing is described, which comprises an outer ring having on its inner periphery an outer raceway, an inner ring having on its outer periphery an inner raceway, plural balls rotatably disposed between the outer raceway and the inner raceway, a cage holding the plural balls in a freely rotatable manner, and a grease packed in a space between the outer raceway and the inner raceway, wherein the inner peripheral surface of each pocket of the cage contains a spherical part consisting of a spherical concave surface whose radius of curvature is slightly larger than that of each ball and a curved part which has the radius of curvature being larger than that of the spherical part and is smoothly continuous from the end of the spherical part toward the end thereof on the opening side of the pocket.

Ball bearing

The pocket surface of a pocket with a ball stored therein has a pair of first pocket surfaces respectively formed inside a pair of pawls and a second pocket surface situated between the two first pocket surfaces. The second pocket surface is formed as a spherical-shaped concave surface having a radius of curvature the center of curvature of which is the rotation center of the ball in a no-load state. Each of the first pocket surfaces has a center of curvature shifted from the center of curvature of the second pocket surface toward the opposite side to the entrance (opening) of the pocket by an axially shifting quantity h , and each of the first pocket surfaces is formed, starting from the present center of curvature, as a spherical-shaped concave surface with its radius of curvature set larger than the radius of curvature of the second pocket surface.

Retainer for rolling bearing

In a rolling bearing including an inner race; an outer race; a plurality of rolling elements rollingly arranged between the inner race and the outer race; and a cage holding the rolling elements, the cage has an annular shape and a plurality of pockets which are formed at plural positions in a circumferential direction of the cage, in which each of the pockets has an opening peripheral portion which is curved to a direction of increasing a distance from a center of the rolling elements. The opening peripheral portion forms a chamfered face or a convex face. The rolling bearing can sufficiently ensure the lubrication of sliding contact portions between the cage and rolling elements so that vibrations and noises of the rolling bearing are lowered.

Cage for a rolling bearing

A method of manufacturing steel balls for use in a ball bearing comprising an inner steel race or shaft with an inner raceway formed around its outer peripheral surface, an outer steel race with an outer raceway formed around its inner peripheral surface, and the steel balls freely rotatably disposed between the inner raceway and the outer raceway comprises the steps of providing steel balls, quenching the steel balls, preliminarily tempering the steel balls after quenched, rough-polishing the steel balls after preliminarily tempered, surface-hardening the steel balls after rough-polished, tempering the steel balls after surface-hardened, and finish-polishing the steel balls after tempered.

Method for manufacturing balls for bearing and products thereby

A rolling bearing in which the outer diameter of a first rolling element is different from that of a second rolling element. During the operation of the rolling bearing, the speeds of revolution of the first and second rolling elements are different from each other due to a difference in their outer diameter. The circumferential directions in which the first and second rolling elements move within pockets are opposite to each other, so that a cage is prevented from vibrating with respect to the first and second rolling elements.

Growing community of inventors

Kanagawa, Japan

Yasushi Mutoh