Keizaburo Usui

Title: Keizaburo Usui: Innovator in Actuator and Gear Shift Control Systems

Introduction

Keizaburo Usui is a notable inventor based in Yokohama, Japan. He has made significant contributions to the field of engineering, particularly in the development of actuators and gear shift control systems. With a total of 10 patents to his name, Usui's work has had a lasting impact on automotive technology.

Latest Patents

One of Usui's latest patents is an actuator for remote devices. This invention aims to create a highly compact actuator capable of selectively operating two remotely arranged latches or similar devices. The design incorporates a reversible motor, a reduction gear, and a clutch arrangement that includes a solenoid coil. Notably, the clutch features a two-stage arrangement, allowing for the use of a small, power-efficient solenoid. Additionally, the compact reduction gear consists of two ring gears and stepped pinion gears, enhancing its efficiency.

Another significant patent is a gear shift control system for automatic transmissions that utilizes air flow. This system includes an air flow sensor that detects the quantity of air entering an internal combustion engine and sends a corresponding electrical signal to a differentiator. This differentiator provides a derivative of the sensed intake air quantity. A vehicle speed sensor measures the engine crankshaft's rotation speed, generating a corresponding signal. The gear shift decision circuit processes signals from both sensors to define a gear shift control line on a two-dimensional coordinate system. The derivative of the sensed air quantity is used to adjust the gear shift control line, facilitating downshift operations.

Career Highlights

Throughout his career, Usui has worked with prominent companies, including Nissan Motor Company Limited and Ohi Seisakusho Co., Ltd. His experience in these organizations has allowed him to refine his skills and contribute to innovative projects in the automotive sector.

Collaborations

Usui has collaborated with notable individuals in his field, including Isao Hayama and Yoshikazu Hayakawa. These partnerships have fostered a creative environment that has led to the development of groundbreaking technologies.

Conclusion

Keizaburo Usui's contributions to actuator and gear shift control systems exemplify his innovative spirit and dedication to engineering. His patents reflect a commitment to enhancing automotive technology, making him a significant figure in the industry.