Isamu Ishizawa

Title: Isamu Ishizawa and His Throttle-Control Inventions.

Introduction

Isamu Ishizawa is an inventor associated with Katsuta, Japan, and Hitachi, Ltd. His work includes inventions for controlling airflow and throttle operation in internal combustion engines. Ishizawa is credited with 3 patents.

Latest Patents

One of Ishizawa’s latest patents concerns a multiple throttle mechanism for internal combustion engines. The design uses separated intake manifold blocks, parallel passages, and paired throttle shafts to control airflow to engine cylinders. Air gaps between the shaft surfaces and the surrounding through holes provide an initial flow of air.

Another patent describes a motor-driven throttle valve assembly. A motor adjusts the throttle valve in response to accelerator-pedal depression, while a restricting plate controls the shaft’s rotation toward the closed position. The plate is positioned between the throttle-shaft bearing and the gear mechanism that transmits motor rotation.

Career Highlights

Ishizawa’s documented inventions focus on engine intake and throttle systems. These designs address airflow management and the mechanical control of throttle valves.

Collaborations

Ishizawa is associated with Hitachi, Ltd. His listed coworkers include Sigeo Tamaki and Shozo Yanagisawa.

Conclusion

Isamu Ishizawa’s patent work reflects a focus on practical throttle mechanisms and motor-driven control systems for internal combustion engines.