Shinji Sumi

Title: Shinji Sumi: Automotive Exhaust-System Inventor

Introduction

Shinji Sumi is an inventor based in Hiroshima, Japan, whose patent work focuses on exhaust systems for multi-cylinder engines. He is associated with Mazda Motor Corporation and has 2 patents.

Latest Patents

Sumi’s listed patents address exhaust routing and the delivery of exhaust gas to a catalyst.

- **Exhaust device of multiple-cylinder engine.** This invention connects independent, circular-cross-section exhaust pipes from the engine’s cylinders to a mixing pipe. The pipes overlap in a defined section, with the overlapping portions increasing gradually toward the downstream end.

- **Exhaust device of multi-cylinder engine.** This design arranges four independent exhaust pipes, collecting pipes, and a catalyst in sequence along the exhaust flow. Its pipe bends and diagonal connection to the catalyst inlet are intended to manage local exhaust-gas introduction and differences in introduction positions among cylinders.

Career Highlights

Sumi’s patent portfolio reflects work on engine exhaust architecture, including how separate cylinder flows are combined and directed toward a catalyst. His listed company affiliation is Mazda Motor Corporation.

Collaborations

The provided information names Jiro Kato and Haruna Yanagida as Sumi’s coworkers. It does not specify their roles in the listed patents.

Conclusion

Shinji Sumi’s two listed patents focus on multi-cylinder engine exhaust systems, with particular attention to pipe geometry, flow mixing, and catalyst connections.