Yasunori Tokunou

Title: Yasunori Tokunou: Innovator in Hydrodynamic Bearings and Manufacturing Methods

Introduction

Yasunori Tokunou is a notable inventor based in Saijyou, Japan. He has made significant contributions to the field of engineering, particularly in the development of hydrodynamic bearing devices and manufacturing methods for hollow cylinders. With a total of 2 patents, his work has had a considerable impact on various industries.

Latest Patents

One of Tokunou's latest patents is a hydrodynamic bearing device designed to inhibit the leakage of a working fluid outside the bearing. This innovation prevents a reduction in radial bearing rigidity and maintains a favorable gap between the thrust bearing and the radial bearing, ensuring stable rotation. The device features a shaft that is rotatably inserted into a bearing hole of a sleeve, with dynamic pressure generating grooves on the surfaces. The shaft is constructed from high manganese chrome steel or stainless steel, while the sleeve is made entirely of sintered metal containing at least 60% by weight of iron or copper. The incorporation of resin, metal, or water glass in the pores of the sintered metal surface helps to prevent fluid leakage and maintain pressure within the bearing.

Another significant patent involves a method for manufacturing a bottomed hollow cylinder, which is essential for rotary head drums in magnetic recording systems, such as video tape recorders and digital audio tape recorders. This method includes pressing a single circular plate to form the hollow cylinder and adjusting the thickness of the side wall to be uniform. Additionally, the outer surface of the side wall is machined to achieve a specific surface roughness and roundness.

Career Highlights

Yasunori Tokunou is associated with Matsushita Electric Industrial Co., Ltd., a company known for its innovative electronic products. His work at this esteemed organization has allowed him to contribute to advancements in technology and manufacturing processes.

Collaborations

Throughout his career, Tokunou has collaborated with notable coworkers, including Tsutomu Hamada and Toshikazu Shogase. These partnerships have fostered a creative environment that has led to the development of groundbreaking inventions.

Conclusion

Yasunori Tokunou's contributions to the fields of hydrodynamic bearings and manufacturing methods highlight his innovative spirit and dedication to engineering. His patents reflect a commitment to improving technology and enhancing product performance.