Yasuo Sumi

Title: Innovations of Yasuo Sumi in Automatic Transmission Technology

Introduction

Yasuo Sumi is a notable inventor based in Kanagawa, Japan, recognized for his contributions to automatic transmission technology. With a total of nine patents to his name, Sumi has developed innovative solutions that enhance the performance and efficiency of automatic transmissions.

Latest Patents

One of Sumi's latest patents is a gear-operated speed change apparatus for automatic transmission. This invention allows for a higher degree of freedom in selecting gear ratios compared to traditional Ravigneaux type composite planetary gear trains. It also boasts advantages in strength, fuel economy, and size reduction of the automatic transmission. The apparatus can achieve at least seven forward speeds and one reverse speed by engaging and releasing four clutches and two brakes. Additionally, one of the planetary gear sets can either reduce or increase the speed of input rotation, while another features a double sun gear type design for efficient rotation input and output.

Another significant patent is a gear shifter for automatic transmission. This control apparatus similarly offers a higher degree of freedom in gear ratio selection than the Ravigneaux type. It improves fuel economy and reduces the size of the automatic transmission while achieving six forward speeds and one reverse speed through the engagement of three clutches and two brakes. One of the planetary gear sets serves as a speed-reducing or speed-increasing device, while another features a double sun gear type design.

Career Highlights

Sumi has worked with prominent companies in the automotive industry, including Jatco Corporation and Jatco Transtechnology Ltd. His experience in these organizations has significantly contributed to his expertise in automatic transmission systems.

Collaborations

Throughout his career, Yasuo Sumi has collaborated with talented individuals such as Wataru Ishimaru and Masato Fujikawa. These partnerships have fostered innovation and advancement in the field of automatic transmissions.

Conclusion

Yasuo Sumi's innovative work in automatic transmission technology has led to significant advancements in the industry. His patents reflect a commitment to improving efficiency and performance in automotive systems.