Location History:
- Shizuoka, JP (1998)
- Iwata, JP (1997 - 2004)
- Aichi, JP (2012)
- Mie-ken, JP (2006 - 2013)
- Kuwana, JP (2005 - 2015)
Company Filing History:
22 out of 2,464 
3 out of 5 Years Active: 1997-2015
Title: Nobuyoshi Yamashita: Innovator in Hydrodynamic Bearing Technology
Introduction: Nobuyoshi Yamashita, hailing from Kuwana, Japan, has made significant strides in the field of bearing technology, particularly with hydrodynamic bearings. With a portfolio of 22 patents, he has established himself as a leading inventor, contributing innovative solutions to various engineering challenges.
Latest Patents: Among his latest inventions is a method for producing a shaft member for hydrodynamic bearing apparatus. This invention describes a forging process that integrates both a shaft portion and a flange portion into a single shaft material. Precise grinding techniques are employed on the end faces to achieve exceptional cylindricity of the radial bearing faces, measuring 3 µm or lower. Furthermore, thrust hydrodynamic groove regions are intricately formed on both end faces of the flange portion during this process. Another notable patent is related to a fluid dynamic bearing device, which aims to create a bearing member with a highly accurate dynamic pressure generating portion at a low cost. This involves forming dynamic pressure grooves using an electroforming process followed by injection molding with resin, ensuring durability and performance.
Career Highlights: Nobuyoshi Yamashita has had a distinguished career, having worked with prominent companies such as NTN Corporation and Fukui Byora Co., Ltd. His work has been pivotal in advancing technologies that enhance bearing performance in various applications.
Collaborations: Throughout his career, Yamashita has collaborated with esteemed colleagues, including Motoharu Niki and Tetsuya Kurimura. Their collective expertise and innovative approaches have contributed to Yamashita’s success and the development of cutting-edge technologies in the industry.
Conclusion: Nobuyoshi Yamashita stands out as a remarkable inventor with a rich portfolio of patents that underscore his contributions to hydrodynamic bearing technology. His innovative methods and effective collaborations have not only driven advancements in engineering but have also set a foundation for future innovations in the field.