Samsung Electro-mechanics Co., Ltd.

Jin San Kim

Young Tae Kim

Ta Kyoung Lee

Il Oung Park

Young Hwan Lim

There is provided a spindle motor including: a sleeve rotatably supporting a shaft; a base member including a protrusion part having the sleeve fixed thereto; and a rotor hub coupled to the shaft and including an extension wall part allowing an interface between a lubricating fluid and air to be formed, together with an outer peripheral surface of the sleeve, wherein an outer peripheral surface of the extension wall part is inclined in order to prevent a scattering of leaked lubricating fluid, together with one end portion of the protrusion part of the base member.

Spindle motor

Disclosed herein is a method of manufacturing a hydrodynamic bearing in which a metal bearing made of sintered metal powder is internally subjected to chemical etching, to form hydrodynamic pressure grooves thereon, thus assuring a high-precision and reliable hydrodynamic bearing. The method includes: compressing metal powder that is a raw material of the bearing in a press unit, and sintering the compressed metal powder at a predetermined temperature, thus preparing a sintered bearing; removing foreign substances adhering to the sintered bearing through a deburring process, and pressing the sintered bearing into a desired shape; forming a hydrodynamic groove, configured to generate hydrodynamic pressure, on an internal surface of the shaped bearing using chemical etching; and conducting a post treatment of cleaning the bearing including the hydrodynamic grooves thereon and drying the bearing.

Growing community of inventors

Gyeonggi-do, South Korea

Jin San Kim