Location History:
- Toyokawa-shi, Aichi-ken, JP (1990)
- Yokkaichi, JP (2003 - 2004)
- Mie, JP (2001 - 2009)
- Mooka, JP (2004 - 2013)
- Tokyo, JP (2003 - 2024)
Company Filing History:
13 out of 1,058 
5 out of 21,927 
2 out of 164,219 
Years Active: 1990-2024
Title: Masafumi Yamamoto: Innovator in Drive Shaft Technology
Introduction
Masafumi Yamamoto is a prominent inventor based in Tokyo, Japan, renowned for his contributions to the field of drive shaft technology. With a remarkable portfolio of 25 patents, Yamamoto exemplifies innovation and ingenuity in his work, particularly focusing on methods and materials used in automotive components.
Latest Patents
Among his latest patents is a breakthrough titled **"Drive Shaft and Method of Producing Drive Shaft."** This innovative drive shaft comprises a first annular wall and a second annular wall, which are intricately joined via a friction-welded portion. The design features outer diameters ranging from 30 to 50 mm and wall thicknesses between 3 to 5 mm. Notably, the burr formed at the friction-welded area exhibits specific dimensions, with a connection radius and base radius of at least 0.5 mm, along with a burr base angle of no more than 40° and a burr slope length between 0.2 to 5 mm.
Another significant patent includes **"Drive Shaft and Method for Producing Drive Shaft,"** which outlines a configuration where solid stub shafts made from medium carbon steel are attached to both ends of a hollow tubular body. The grain size number of the hollow body at the joint areas ranges from #5 to #9, while the solid stub shafts range from #10 to #12, illustrating the meticulous craftsmanship involved in his designs.
Career Highlights
Yamamoto's professional journey includes substantial tenures at well-respected companies such as JSR Corporation and Honda Motor Co., Ltd. His experience in these leading organizations has greatly influenced his inventive capabilities, allowing him to tackle complex engineering challenges and develop novel solutions.
Collaborations
Throughout his career, Masafumi Yamamoto has collaborated with esteemed colleagues, including Toru Kajita and Yukio Nishimura. This teamwork has fostered a dynamic environment for innovation and exchange of ideas, contributing to the development of cutting-edge technologies in their field.
Conclusion
Masafumi Yamamoto stands out as a distinguished inventor in the automotive industry, specifically for his advancements in drive shaft technology. His extensive patent portfolio and collaborations with industry leaders reinforce his dedication to innovation and excellence. As technology evolves, Yamamoto's contributions will undoubtedly continue to inspire future generations of engineers and inventors.