Patents by Inventor Yasushi Mutoh

Yasushi Mutoh 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
  • Patent number: 7587299
    Abstract: 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 (1) and a user information processing terminal (3) which are connected through a network (2). The diagnosis processing server (1) 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 (2) from the user information processing terminal 3, makes an anomaly diagnosis of the machine installation based on the received data, and transmits the diagnosis result through the network (2) to the user information processing terminal (3), thereby lightening the burden of the user and executing anomaly diagnosis processing promptly.
    Type: Grant
    Filed: August 29, 2007
    Date of Patent: September 8, 2009
    Assignee: NSK Ltd.
    Inventors: Takanori Miyasaka, Hirotoshi Aramaki, Yasushi Mutoh, Shinichiro Asaeda
  • 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: 20080027659
    Abstract: An object of the invention is to provide an anomaly diagnosis apparatus of a machine installation for eliminating the need for the user to have a dedicated analytical instrument or a skill required for anomaly diagnosis of a sliding member and enabling the user to easily make an anomaly diagnosis request with a small burden and get the diagnosis result promptly. In the invention, 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 is made up of a diagnosis processing server (1) and a user information processing terminal (3) which are connected through a network (2).
    Type: Application
    Filed: August 29, 2007
    Publication date: January 31, 2008
    Applicant: NSK Ltd
    Inventors: Takanori Miyasaka, Hirotoshi Aramaki, Yasushi Mutoh, Shinichiro Asaeda
  • Publication number: 20080010039
    Abstract: An object of the invention is to provide an anomaly diagnosis apparatus of a machine installation for eliminating the need for the user to have a dedicated analytical instrument or a skill required for anomaly diagnosis of a sliding member and enabling the user to easily make an anomaly diagnosis request with a small burden and get the diagnosis result promptly. In the invention, 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 is made up of a diagnosis processing server (1) and a user information processing terminal (3) which are connected through a network (2).
    Type: Application
    Filed: August 29, 2007
    Publication date: January 10, 2008
    Applicant: NSK Ltd
    Inventors: Takanori Miyasaka, Hirotoshi Aramaki, Yasushi Mutoh, Shinichiro Asaeda
  • Patent number: 7116095
    Abstract: 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.
    Type: Grant
    Filed: February 17, 2005
    Date of Patent: October 3, 2006
    Assignee: NSK Ltd.
    Inventors: Takeshi Takizawa, Shigeru Endo, Ikunori Sakatani, Tatsunobu Momono, Yasushi Mutoh
  • Publication number: 20050140357
    Abstract: 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.
    Type: Application
    Filed: February 17, 2005
    Publication date: June 30, 2005
    Inventors: Takeshi Takizawa, Shigeru Endo, Ikunori Sakatani, Tatsunobu Momono, Yasushi Mutoh
  • Patent number: 6894484
    Abstract: 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.
    Type: Grant
    Filed: January 24, 2002
    Date of Patent: May 17, 2005
    Assignee: NSK Ltd.
    Inventors: Takeshi Takizawa, Shigeru Endo, Ikunori Sakatani, Tatsunobu Momono, Yasushi Mutoh
  • Publication number: 20040030419
    Abstract: An object of the invention is to provide an anomaly diagnosis apparatus of a machine installation for eliminating the need for the user to have a dedicated analytical instrument or a skill required for anomaly diagnosis of a sliding member and enabling the user to easily make an anomaly diagnosis request with a small burden and get the diagnosis result promptly.
    Type: Application
    Filed: May 5, 2003
    Publication date: February 12, 2004
    Inventors: Takanori Miyasaka, Hirotoshi Aramaki, Yasushi Mutoh, Shinichiro Asaeda
  • Patent number: 6682223
    Abstract: 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.
    Type: Grant
    Filed: March 28, 2002
    Date of Patent: January 27, 2004
    Assignee: NSK Ltd.
    Inventors: Youichiro Sugimori, Yasushi Mutoh, Michiharu Naka, Takashi Ogawa, Yasuhisa Terada, Hiroshi Ishiwada
  • Patent number: 6648517
    Abstract: 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 h1, 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.
    Type: Grant
    Filed: December 4, 2001
    Date of Patent: November 18, 2003
    Assignee: NSK Ltd.
    Inventors: Hiroshi Ishiwada, Yasushi Mutoh, Banda Noda, Tatsunobu Momono, Magozou Hamamoto, Yasuhisa Terada
  • Publication number: 20030103703
    Abstract: 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 h1, 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.
    Type: Application
    Filed: December 4, 2001
    Publication date: June 5, 2003
    Applicant: NSK LTD.
    Inventors: Hiroshi Ishiwada, Yasushi Mutoh, Banda Noda, Tatsunobu Momono, Magozou Hamamoto, Yasuhisa Terada
  • Publication number: 20030077015
    Abstract: 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.
    Type: Application
    Filed: March 28, 2002
    Publication date: April 24, 2003
    Applicant: NSK LTD.
    Inventors: Youichiro Sugimori, Yasushi Mutoh, Michiharu Naka, Takashi Ogawa, Yasuhisa Terada, Hiroshi Ishiwada
  • Publication number: 20020097040
    Abstract: 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.
    Type: Application
    Filed: January 24, 2002
    Publication date: July 25, 2002
    Applicant: NSK LTD.
    Inventors: Takeshi Takizawa, Shigeru Endo, Ikunori Sakatani, Tatsunobu Momono, Yasushi Mutoh
  • Patent number: 6068408
    Abstract: 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.
    Type: Grant
    Filed: October 9, 1996
    Date of Patent: May 30, 2000
    Assignee: NSK Ltd.
    Inventors: Yasushi Mutoh, Setsu Kawaguchi, Eiichi Takahashi, Kenji Okuma, Magozou Hamamoto, Hideki Koizumi, Tatsunobu Momono, Toshihisa Ohata, Takashi Murai, Banda Noda
  • Patent number: 5603576
    Abstract: 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.
    Type: Grant
    Filed: March 7, 1994
    Date of Patent: February 18, 1997
    Assignee: NSK, Ltd.
    Inventors: Kiyoshi Hirakawa, Akira Suzuki, Jiami Pu, Katsunori Yanase, Minoru Kohari, Eiichi Takahashi, Yasushi Mutoh
  • Patent number: 5443317
    Abstract: 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.
    Type: Grant
    Filed: June 29, 1994
    Date of Patent: August 22, 1995
    Assignee: NSK Ltd.
    Inventors: Tatunobu Momono, Yasushi Mutoh
  • Patent number: 5247619
    Abstract: A circuit device (e.g. mounted on a printed circuit board) is connected to a data network, to which network are also connected a plurality of other circuit devices under power. On removal of such a circuit device, the output driver connecting the circuit components of the output device to the communications bus of the bus network is first disconnected from power, and only when its disconnection is stable is the device withdrawn. A control device of the circuit device is connected to the control bus of the data network, and before power is disconnected from the output driver, the control device signals to the network so as to prevent other circuit devices connected to the network from signalling on the network. Effectively, the circuit device to be removed "occupies" the bus. This occupation is maintained until the disconnection of the output driver is stable, and then the circuit device can be removed from the network.
    Type: Grant
    Filed: July 5, 1989
    Date of Patent: September 21, 1993
    Assignees: Hitachi, Ltd., Hitachi Process Computer Engineering, Inc.
    Inventors: Yasushi Mutoh, Masakazu Okada, Shozi Yamaguchi, Kunio Suzuki