Patents by Inventor Towako MATSUI

Towako MATSUI 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: 10190185
    Abstract: A hardening method for an annular workpiece made of metal includes a heating process that heats the annular workpiece to a hardening temperature; an analyzing process that obtains a diameter of the annular workpiece heated to the hardening temperature, and divides the heated annular workpiece into at least a small diameter portion and a large diameter portion based on the obtained diameter; and a cooling process that injects cooling liquid under an injection condition toward the annular workpiece that has been divided into at least the large diameter portion and the small diameter portion in the analyzing process such that a dimensional difference between the large diameter portion and the small diameter portion decreases, the injection condition for the large diameter portion being different from the injection condition for the small diameter portion.
    Type: Grant
    Filed: August 12, 2016
    Date of Patent: January 29, 2019
    Assignee: JTEKT CORPORATION
    Inventors: Towako Matsui, Tsuyoshi Mikami, Katsuhiko Kizawa
  • Publication number: 20180305779
    Abstract: A heat treatment apparatus that thermally treats an annular workpiece formed of a steel material by inductively heating the workpiece includes a treatment tank in which the workpiece is set and thermally treated, a holding portion that holds the workpiece at a predetermined position, an induction heating coil that surrounds the workpiece to inductively heat the workpiece, and a cooling medium that cools surfaces of the workpiece during the induction heating of the workpiece.
    Type: Application
    Filed: June 28, 2018
    Publication date: October 25, 2018
    Applicant: JTEKT CORPORATION
    Inventors: Wataru YOSHIDA, Towako MATSUI, Katsuhiko KIZAWA, Takashi SADA, Tsuyoshi MIKAMI
  • Patent number: 9709099
    Abstract: A bearing ring formed of quenched and tempered high carbon chromium bearing steel, including an inner layer portion formed of tempered martensite or sorbite and having a Vickers hardness of more than 490 HV and 710 HV or less, and a surface layer portion formed to enclose an entire periphery of the inner layer portion, formed of tempered martensite, and having a higher hardness than the inner layer portion.
    Type: Grant
    Filed: October 6, 2015
    Date of Patent: July 18, 2017
    Assignee: JTEKT CORPORATION
    Inventors: Wataru Yoshida, Towako Matsui, Katsuhiko Kizawa, Takashi Sada
  • Publication number: 20170058374
    Abstract: A hardening method for an annular workpiece made of metal includes a heating process that heats the annular workpiece to a hardening temperature; an analyzing process that obtains a diameter of the annular workpiece heated to the hardening temperature, and divides the heated annular workpiece into at least a small diameter portion and a large diameter portion based on the obtained diameter; and a cooling process that injects cooling liquid under an injection condition toward the annular workpiece that has been divided into at least the large diameter portion and the small diameter portion in the analyzing process such that a dimensional difference between the large diameter portion and the small diameter portion decreases, the injection condition for the large diameter portion being different from the injection condition for the small diameter portion.
    Type: Application
    Filed: August 12, 2016
    Publication date: March 2, 2017
    Applicant: JTEKT CORPORATION
    Inventors: Towako MATSUI, Tsuyoshi MIKAMI, Katsuhiko KIZAWA
  • Publication number: 20160108486
    Abstract: A heat treatment apparatus that thermally treats an annular workpiece formed of a steel material by inductively heating the workpiece includes a treatment tank in which the workpiece is set and thermally treated, a holding portion that holds the workpiece at a predetermined position, an induction heating coil that surrounds the workpiece to inductively heat the workpiece, and a cooling medium that cools surfaces of the workpiece during the induction heating of the workpiece.
    Type: Application
    Filed: October 6, 2015
    Publication date: April 21, 2016
    Inventors: Wataru YOSHIDA, Towako MATSUI, Katsuhiko KIZAWA, Takashi SADA, Tsuyoshi MIKAMI
  • Publication number: 20160108961
    Abstract: A bearing ring formed of quenched and tempered high carbon chromium bearing steel, including an inner layer portion formed of tempered martensite or sorbite and having a Vickers hardness of more than 490 HV and 710 HV or less, and a surface layer portion formed to enclose an entire periphery of the inner layer portion, formed of tempered martensite, and having a higher hardness than the inner layer portion.
    Type: Application
    Filed: October 6, 2015
    Publication date: April 21, 2016
    Inventors: Wataru YOSHIDA, Towako MATSUI, Katsuhiko KIZAWA, Takashi SADA
  • Patent number: 8640341
    Abstract: A method of producing a rolling sliding member, wherein, after a work for a rolling sliding member, which is made of a bearing steel and formed in a predetermined shape, is quenched, a heating start temperature is set to be 10 to 100° C., a heating finish temperature is set to be 220 to 350° C., a time between the heating finish time and the heating start time is set to be a heating time, the quenched work for the rolling sliding member is heated so that a rate of temperature increase indicated by the following formula becomes 7 to 35° C./s rate of temperature increase=(heating finish temperature?heating start temperature)/heating time, the work is tempered by being cooled without being maintained at a heating finish temperature from the heating finish time.
    Type: Grant
    Filed: August 10, 2010
    Date of Patent: February 4, 2014
    Assignee: JTEKT Corporation
    Inventors: Towako Matsui, Katsuhiko Kizawa
  • Publication number: 20110030219
    Abstract: A method of producing a rolling sliding member, wherein, after a work for a rolling sliding member, which is made of a bearing steel and formed in a predetermined shape, is quenched, a heating start temperature is set to be 10 to 100° C., a heating finish temperature is set to be 220 to 350° C., a time between the heating finish time and the heating start time is set to be a heating time, the quenched work for the rolling sliding member is heated so that a rate of temperature increase indicated by the following formula becomes 7 to 35° C./s rate of temperature increase=(heating finish temperature?heating start temperature)/heating time, the work is tempered by being cooled without being maintained at a heating finish temperature from the heating finish time.
    Type: Application
    Filed: August 10, 2010
    Publication date: February 10, 2011
    Applicant: JTEKT Corporation
    Inventors: Towako MATSUI, Katsuhiko KIZAWA