Patents by Inventor Youhei TANNO

Youhei TANNO 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).

  • Bolt fastening structure and turbo-machine using same
    Patent number: 11280223
    Abstract: A bolt fastening structure has an upper flange and a lower flange of a casing to which inner pressure is applied, the upper flange and the lower flange defining an abutting interface therebetween; a bolt hole formed through the abutting interface; and a counterbored portion formed asymmetric about a bolt hole center. The abutting interface includes a first region extending from a bolt hole inner side edge to an upper and lower flanges inner edge and being a region where the upper flange and the lower flange are in surface-to-surface contact with each other; and a partial contact region extending from a bolt hole outer side edge to an upper and lower flanges outer edge and being a region where the upper flange and the lower flange are partially in surface-to-surface contact with each other. In the partial contact region, the upper flange and the lower flange are in surface-to-surface contact with each other in a second region, and the first region is larger than the second region.
    Type: Grant
    Filed: March 23, 2017
    Date of Patent: March 22, 2022
    Assignee: Hitachi Industrial Products, Ltd.
    Inventors: Youhei Tanno, Takeshi Kazama, Ryuhei Tsukahara, Taiji Hashimoto, Tomohiro Naruse
  • Bolt Fastening Structure and Turbo-Machine Using Same
    Publication number: 20190055855
    Abstract: A bolt fastening structure has an upper flange and a lower flange of a casing to which inner pressure is applied, the upper flange and the lower flange defining an abutting interface therebetween; a bolt hole formed through the abutting interface; and a counterbored portion formed asymmetric about a bolt hole center. The abutting interface includes a first region extending from a bolt hole inner side edge to an upper and lower flanges inner edge and being a region where the upper flange and the lower flange are in surface-to-surface contact with each other; and a partial contact region extending from a bolt hole outer side edge to an upper and lower flanges outer edge and being a region where the upper flange and the lower flange are partially in surface-to-surface contact with each other. In the partial contact region, the upper flange and the lower flange are in surface-to-surface contact with each other in a second region, and the first region is larger than the second region.
    Type: Application
    Filed: March 23, 2017
    Publication date: February 21, 2019
    Inventors: Youhei TANNO, Takeshi KAZAMA, Ryuhei TSUKAHARA, Taiji HASHIMOTO, Tomohiro NARUSE