Patents by Inventor Muneyasu Akiyama

Muneyasu Akiyama 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).

  • Double-row ball bearing and bearing device for supporting pinion shaft
    Patent number: 7350977
    Abstract: A ball bearing with double raceway rotatably supports a pinion shaft having a pinion gear on its one end. This ball bearing with double raceway is provided with: an outer ring member having a large-diameter raceway surface and a small-diameter raceway surface; an inner ring member having a large-diameter raceway surface and a small-diameter raceway surface that correspond to the large-diameter raceway surface and the small-diameter raceway surface of the outer ring member; a large-diameter-side row of balls that are interpolated between the two large-diameter raceway surfaces; a small-diameter-side row of balls that are interpolated between the two small-diameter raceway surfaces; a large-diameter-side cage that holds the large-diameter-side row of balls; and a small-diameter-side cage that holds the small-diameter-side row of balls.
    Type: Grant
    Filed: April 17, 2003
    Date of Patent: April 1, 2008
    Assignee: Jtekt Corporation
    Inventors: Toshirou Fukuda, Hideo Ueda, Toshihiro Kawaguchi, Kunihiko Yokota, Motoshi Kawamura, Muneyasu Akiyama, Tomonori Nakashita
  • Bearing apparatus for supporting pinion shaft
    Publication number: 20070104403
    Abstract: A bearing apparatus for supporting a pinion shaft comprises a pair of rolling bearings which rotatably support a pinion shaft to a case and are arranged side by side in a shaft direction between a pinion gear arranged at one end of the pinion shaft, and a companion flange attached outside the other end thereof. The rolling bearing on a companion flange side comprises an angular ball bearing, and a radius of curvature Ri of an inner ring raceway, a radius of curvature Ro of an outer ring raceway, and a ball diameter Bd of the rolling bearing may satisfy a relationship given by equations of Ri<Ro, 0.502×Bd?Ri?0.512×Bd, and 0.510×Bd?Ro?0.520×Bd.
    Type: Application
    Filed: December 11, 2003
    Publication date: May 10, 2007
    Applicant: Koyo Seiko Co., Ltd.
    Inventors: Motoshi Kawamura, Muneyasu Akiyama, Hiroshi Tachi
  • Double-row ball bearing and bearing device for supporting pinion shaft
    Publication number: 20050232524
    Abstract: A ball bearing with double raceway rotatably supports a pinion shaft having a pinion gear on its one end. This ball bearing with double raceway is provided with: an outer ring member having a large-diameter raceway surface and a small-diameter raceway surface; an inner ring member having a large-diameter raceway surface and a small-diameter raceway surface that correspond to the large-diameter raceway surface and the small-diameter raceway surface of the outer ring member; a large-diameter-side row of balls that are interpolated between the two large-diameter raceway surfaces; a small-diameter-side row of balls that are interpolated between the two small-diameter raceway surfaces; a large-diameter-side cage that holds the large-diameter-side row of balls; and a small-diameter-side cage that holds the small-diameter-side row of balls.
    Type: Application
    Filed: April 17, 2003
    Publication date: October 20, 2005
    Applicant: Koyo Seiko Co., Ltd.
    Inventors: Toshirou Fukuda, Hideo Ueda, Toshihiro Kawaguchi, Kunihiko Yokota, Motoshi Kawamura, Muneyasu Akiyama, Tomonori Nakashita