Patents by Inventor Yasutaro Yamashita

Yasutaro Yamashita 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).

  • Cam follower with roller for use with engine
    Patent number: 5456136
    Abstract: A cam follower with a roller for use with an engine, the roller adapted for rolling contact with a cam on a camshaft. The roller is formed with minute recesses arranged in random directions so that an RMS(L)/RMS(C) ratio is not more than 1.0 wherein RMS(L) and RMS(C) are surface roughness root mean square values in the axial and circumferential directions, respectively. An SK value, another surface roughness parameter, should be not more than -1.6. This degree of roughness represents a higher surface roughness than prior art cam followers, provides greater oil retention and therefor better lubrication.
    Type: Grant
    Filed: October 18, 1993
    Date of Patent: October 10, 1995
    Assignee: NTN Corporation
    Inventors: Yasutaro Yamashita, Kiyohito Nakamura, Toshihide Goto