Location History:
- Hachioji, JP (2004)
- Tokyo, JP (2006 - 2009)
- Hidaka, JP (2011)
Company Filing History:
3 out of 243 
3 out of 5 
1 out of 203 
Years Active: 2004-2025
Title: Innovations by Yoji Yamashita: A Pioneer in EGR Cooler Technology
Introduction: Yoji Yamashita is an esteemed inventor based in Tokyo, Japan, recognized for his significant contributions to automotive engineering. With a total of four patents, his innovations primarily focus on exhaust gas recirculation (EGR) coolers, showcasing his expertise in optimizing engine performance and efficiency.
Latest Patents: Among his latest inventions, the EGR cooler stands out for its advanced design. This cooler features a series of tubes enclosed within a shell, facilitating the exchange of exhaust gases from a diesel engine with cooling water. A notable characteristic of this invention is the inner structure of the tubes, which contains three streaks of spiral protrusions designed to enhance the heat exchange process. The parameters of the design, including a pitch ratio of 2.0-4.0 and a ridge height ratio of 0.1-0.2 relative to the inner diameter of the tubes, add to its efficiency. Another version of the EGR cooler introduces a bypass flow path within the shell to prevent stagnation of cooling water, further enhancing its utility in automotive applications.
Career Highlights: Yoji has made significant strides in the automotive industry, known for his work with prominent companies such as Hino Motors, Ltd. and Sankyo Radiator Co., Ltd. His expertise and innovative mindset have led to advancements that benefit engine temperature management and overall vehicle performance.
Collaborations: Throughout his career, Yoji Yamashita has enjoyed collaborations with notable colleagues like Makoto Tsujita and Keiichi Nakagome. These professional relationships have fostered an environment of creativity and shared knowledge, contributing to the continuous evolution of automotive technologies.
Conclusion: Yoji Yamashita's inventive spirit and dedication to automotive innovation have positioned him as a key figure in the development of effective EGR cooling solutions. His patents reflect a deep understanding of engineering principles, and his work continues to influence the industry, paving the way for future advancements in engine technology.