Yoshihiro Arakawa

Title: Yoshihiro Arakawa and His Internal Combustion Engine Valve Innovation.

Introduction

Yoshihiro Arakawa is an inventor associated with Sagamihara, Japan, and Isuzu Motors Limited. His patent work includes a valve driving device for an internal combustion engine.

Latest Patents

Arakawa’s listed patent, “Valve Driving Device of an Internal Combustion Engine,” describes a system designed to control a main valve using actuating fluid. The device initially reduces the pressure chamber’s volume and uses a limited amount of energy to start opening the main valve, which then rises through inertial motion.

As the valve lifts, a first actuating valve supplies high-pressure fluid to the pressure chamber. If the chamber’s pressure falls below that of a low-pressure chamber, a second valve opens independently to introduce low-pressure fluid and prevent a vacuum from forming. This helps hold the main valve at a lift position corresponding to the initial energy supplied.

To close the main valve, an actuator opens the second valve. High-pressure fluid then flows through it, opens a downstream third valve, and discharges into a passage. The design is intended to manage valve movement and actuating-fluid flow efficiently. Arakawa is credited with 1 patent.

Career Highlights

Arakawa’s listed invention focuses on the operation of internal combustion engine valves and the control of pressure within an actuating chamber. His work is associated with Isuzu Motors Limited.

Collaborations

Akihiko Minato and Tsuneo Tanaka are identified as Arakawa’s coworkers.

Conclusion

Yoshihiro Arakawa’s patent describes an internal combustion engine valve-driving system that uses controlled fluid pressure and inertial motion to manage valve opening and closing.