Introduction: Teruo Kumai, a distinguished inventor based in Susono, Japan, has made remarkable contributions to the field of engineering, particularly in the development of piston ring technology. With a total of 15 patents to his name, Kumai has significantly impacted automotive design and functionality through his innovative solutions.

Latest Patents: Among Kumai's latest patents are two notable inventions that focus on the structural integrity and mounting methods of piston rings. The first patent describes a piston ring structural body made of resinous materials, featuring an outer ring continuously formed of polyimide and an inner ring of PTFE. This innovative design utilizes a coil expander to exert radial pressure, ensuring effective sealing and performance. Key features include a sliding face divided into upper and lower segments, which are chamfered at the edge for enhanced functionality. The second patent presents a sealing structure where the outer ring is also made of polyimide but is pressed radially outwards by a metal coil expander through a steel inner ring. This invention cleverly incorporates grooves in the sliding face to further optimize sealing efficiency.

Career Highlights: Teruo Kumai's professional journey includes significant tenure at Toyota Motor Corporation, where he was instrumental in various engineering projects. His experience at such a renowned company has allowed him to refine his skills and develop cutting-edge inventions that address essential automotive requirements.

Collaborations: Throughout his career, Kumai has had the pleasure of collaborating with esteemed colleagues, including Sumio Ito and Michio Okamoto. These partnerships have fostered a creative environment that thrives on innovation and excellence, further amplifying the impact of their collective work in the engineering space.

Conclusion: Teruo Kumai is a brilliant inventor whose groundbreaking work in piston ring technology exemplifies the importance of innovation in advancing automotive engineering. With his extensive patent portfolio and collaborative efforts within the industry, Kumai continues to inspire the next generation of inventors and engineers in their pursuit of excellence. His legacy serves as a testament to the power of creativity and dedication in the field of technology.

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