Toshinori Aoki

Title: **Innovations by Toshinori Aoki: Pioneering High-Strength Valve Springs**

Introduction

Toshinori Aoki, an innovative inventor based in Nagoya, Japan, has made significant contributions to the field of material engineering, particularly through his patents focusing on high-strength valve springs. With a total of two patents to his name, Aoki's work stands out for its meticulous attention to material properties and manufacturing techniques that enhance performance.

Latest Patents

Aoki's latest patents include a **High-strength valve spring and its manufacturing method**. This remarkable invention utilizes a steel alloy comprising 0.5-0.8% carbon (C), 1.2-2.5 weight percent silicon (Si), 0.4-0.8 weight percent manganese (Mn), and 0.7-1.0 weight percent chromium (Cr), with the balance being iron (Fe) and unavoidable impurities. Among the impurities, aluminum (Al) and titanium (Ti) are limited to a maximum of 0.005 weight percent. The manufacturing process involves oil tempering with a heating temperature during hardening set between 950-1100 °C, followed by a nitriding treatment performed post-coiling.

Another notable invention is the **Coil spring resistive to delayed fracture and its manufacturing method**. This patent describes a coil spring constructed from oil-tempered steel wire possessing an internal hardness exceeding Hv 550. The surface hardness lies between a minimum of Hv 420 and a maximum defined by subtracting Hv 50 from the internal hardness. These innovations not only improve fatigue strength and sag resistance but also enhance the delayed fracture resistance of the springs.

Career Highlights

Throughout his career, Toshinori Aoki has been associated with prominent companies in the engineering sector. Notable among these are Chuo Hatsujo Kabushiki Kaisha and Honda Giken Kogyo Kabushiki Kaisha, where he contributed his expertise to various engineering projects and innovations.

Collaborations

Aoki has collaborated with fellow inventors, including Taisuke Nishimura and Takashi Otowa. Their joint efforts in material science and mechanical engineering have further propelled the development of innovative spring technologies.

Conclusion

Toshinori Aoki exemplifies the spirit of innovation in the field of engineering. His patents not only reflect a deep understanding of materials and their properties but also address practical challenges in manufacturing high-strength components. As the industry continues to evolve, Aoki's contributions will remain a cornerstone in the development of advanced materials and manufacturing methods.