Patents by Inventor Juntaro Sahara

Juntaro Sahara has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 7860663
    Abstract: A abnormality diagnosing apparatus used in a machine equipment including a rotating or sliding part relative to a stationary member includes a detecting portion 31 fixed to the rotating or sliding part or the stationary member and including a vibration sensor 32 and a temperature sensor 33, and a signal processing portion 81 for determining a state of the part from a detecting signal outputted by the detecting portion 31. The signal processing portion 81 determines 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 sensor 32 and a measured result by the temperature sensor 33.
    Type: Grant
    Filed: September 13, 2005
    Date of Patent: December 28, 2010
    Assignee: NSK Ltd.
    Inventors: Takanori Miyasaka, Yasushi Mutoh, Juntaro Sahara
  • Patent number: 7640139
    Abstract: Provided are an envelope processor 103, for obtaining an envelope for a detected signal; a FFT unit 104, for converting the envelope into a frequency spectrum; a peak detector 105, 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.
    Type: Grant
    Filed: October 17, 2005
    Date of Patent: December 29, 2009
    Assignee: NSK Ltd.
    Inventors: Juntaro Sahara, Yasushi Mutoh, Takanori Miyasaka, Masanobu Yamazoe
  • Publication number: 20080234964
    Abstract: A abnormality diagnosing apparatus used in a machine equipment including a rotating or sliding part relative to a stationary member includes a detecting portion 31 fixed to the rotating or sliding part or the stationary member and including a vibration sensor 32 and a temperature sensor 33, and a signal processing portion 81 for determining a state of the part from a detecting signal outputted by the detecting portion 31. The signal processing portion 81 determines 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 sensor 32 and a measured result by the temperature sensor 33.
    Type: Application
    Filed: September 13, 2005
    Publication date: September 25, 2008
    Applicant: NSK LTD.
    Inventors: Takanori Miyasaka, Yasushi Mutoh, Juntaro Sahara
  • Publication number: 20080033695
    Abstract: Provided are an envelope processor 103, for obtaining an envelope for a detected signal; a FFT unit 104, for converting the envelope into a frequency spectrum; a peak detector 105, 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.
    Type: Application
    Filed: October 17, 2005
    Publication date: February 7, 2008
    Applicant: NSK LTD
    Inventors: Juntaro Sahara, Yasushi Mutoh, Takanori Miyasaka, Masanobu Yamazoe
  • Publication number: 20070118333
    Abstract: 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.
    Type: Application
    Filed: December 27, 2006
    Publication date: May 24, 2007
    Applicant: NSK LTD.
    Inventors: Takanori Miyasaka, Hirotoshi Aramaki, Yasushi Mutou, Juntaro Sahara
  • Patent number: 7184930
    Abstract: 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.
    Type: Grant
    Filed: August 29, 2003
    Date of Patent: February 27, 2007
    Assignee: NSK Ltd.
    Inventors: Takanori Miyasaka, Hirotoshi Aramaki, Yasushi Mutou, Juntaro Sahara
  • Publication number: 20060167659
    Abstract: 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.
    Type: Application
    Filed: August 29, 2003
    Publication date: July 27, 2006
    Applicant: NSK LTD.
    Inventors: Takanori Miyasaka, Hirotoshi Aramaki, Yasushi Mutou, Juntaro Sahara
  • Patent number: 6955468
    Abstract: 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.
    Type: Grant
    Filed: November 8, 2002
    Date of Patent: October 18, 2005
    Assignee: NSK.Ltd.
    Inventors: Toshikazu Yabe, Soichiro Kato, Hiroki Yamaguchi, Tatsunobu Momono, Juntaro Sahara, Hirotoshi Aramaki
  • Publication number: 20030128901
    Abstract: 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.
    Type: Application
    Filed: November 8, 2002
    Publication date: July 10, 2003
    Applicant: NSK LTD.
    Inventors: Toshikazu Yabe, Soichiro Kato, Hiroki Yamaguchi, Tatsunobu Momono, Juntaro Sahara, Hirotoshi Aramaki
  • Patent number: 6311660
    Abstract: 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 Le of the effective contact length, respectively.
    Type: Grant
    Filed: September 15, 2000
    Date of Patent: November 6, 2001
    Assignee: NSK Ltd.
    Inventors: Juntaro Sahara, Shinichi Natsumeda