Patents by Inventor Yoshinori Mikoshiba

Yoshinori Mikoshiba 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).

  • Automatic transmission
    Patent number: 5647816
    Abstract: An automatic transmission is provided with at least one friction element and a piston. The engagement of the friction element is proceeded in a manner that operating pressure is applied to an apply chamber to stroke the piston. The disengagement of the friction element is proceeded in a manner that operating pressure is applied to a cancel chamber to stroke the piston. The cancel chamber is disposed opposite to the apply chamber with respect to the piston and formed such that an outer diameter of a pressure receiving surface of said cancel chamber is generally the same as that of said apply chamber. Therefore, piston pushing force due to centrifugal force in the apply chamber is balanced with a piston reversely pushing force due to the centrifugal force in the cancel chamber. This prevents the friction element from being dragged during friction element disengaged condition.
    Type: Grant
    Filed: May 8, 1995
    Date of Patent: July 15, 1997
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Hirofumi Michioka, Masahiro Yamamoto, Koichi Hayasaki, Yoshinori Mikoshiba
  • Automatic transmission with passages connecting apply and cancel chambers
    Patent number: 5439088
    Abstract: An automatic transmission is provided with at least one friction element and a piston. The engagement of the friction element is proceeded in a manner that operating pressure is applied to an apply chamber to stroke the piston. The disengagement of the friction element is proceeded in a manner that operating pressure is applied to a cancel chamber to stroke the piston. The cancel chamber is disposed opposite to the apply chamber with respect to the piston and formed such that an outer diameter of a pressure receiving surface of said cancel chamber is generally the same as that of said apply chamber. Therefore, piston pushing force due to centrifugal force in the apply chamber is balanced with a piston reversely pushing force due to the centrifugal force in the cancel chamber. This prevents the friction element from being dragged during friction element disengaged condition.
    Type: Grant
    Filed: January 29, 1993
    Date of Patent: August 8, 1995
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Hirofumi Michioka, Masahiro Yamamoto, Koichi Hayasaki, Yoshinori Mikoshiba