News Column

Patent Issued for Hydrodynamic Bearing Assembly and Motor Including the Same

September 3, 2014



By a News Reporter-Staff News Editor at Journal of Engineering -- Samsung Electro-Mechanics Co., Ltd. (Suwon, KR) has been issued patent number 8810089, according to news reporting originating out of Alexandria, Virginia, by VerticalNews editors.

The patent's inventors are Noh, Jee Ae (Seoul, KR); Lee, Ta Kyoung (Gyunggi-do, KR).

This patent was filed on July 11, 2011 and was published online on August 19, 2014.

From the background information supplied by the inventors, news correspondents obtained the following quote: "The present invention relates to a bearing assembly and a motor including the same, and more particularly, to a bearing assembly in which a structure and a shape of a shaft or a thrust plate are changed to improve coupling force and reduce assembly defects, and a motor including the same.

"A motor generating driving force has been mounted in a hard disk drive (HDD) or an optical disc drive (ODD), both of which being computer information storage devices.

"The motor may provide a space, in which a shaft may rotates, by a bearing. As the bearing, a hydrodynamic bearing, or the like, may be used.

"Meanwhile, in order to allow the shaft to rotate while being supported within the bearing by the hydrodynamic pressure of the bearing, the shaft is inserted into and supported by a sleeve of the bearing.

"However, when the shaft is supported by the hydrodynamic pressure, the shaft has force applied thereto upwardly in an axis direction to thereby be deviated.

"In addition, when the shaft does not rotate, it is in contact with a base cover coupled to a lower portion of the sleeve.

"In order to solve these defects, a thrust plate generating thrust hydrodynamic pressure may be coupled to the shaft such that the shaft may be floated to a predetermined position.

"However, when a bonding process is performed in order to couple the thrust plate to the shaft, a bonded contact area is limited, such that sufficient coupling force is not provided.

"In addition, when the thrust plate is coupled to the shaft, the thrust plate and the shaft are not assembled in a direction intended during initial design. Therefore, research into reducing assembly defects while maintaining sufficient coupling force during the coupling of the thrust plate to the shaft has been required."

Supplementing the background information on this patent, VerticalNews reporters also obtained the inventors' summary information for this patent: "An aspect of the present invention provides a hydrodynamic bearing assembly in which coupling force between a thrust plate and a shaft configuring the hydrodynamic bearing assembly is improved and assembly defects are reduced, and a motor including the same.

"According to an aspect of the present invention, there is provided a hydrodynamic bearing assembly including: a sleeve having a shaft inserted thereinto and supported thereby; a thrust plate coupled to one end of the shaft; an extension part formed at the thrust plate to be extended in an axial direction so as to be coupled to the shaft; and a coupling part formed at the shaft to contact an inner surface of the extension part so as to be coupled to the extension part.

"The coupling part may contact the inner surface and an outer surface of the extension part.

"The coupling part may include a first coupling part contacting the inner surface of the extension part and a second coupling part contacting an outer surface of the extension part, and the extension part may include a hollow formed in order to be coupled to the first coupling part.

"The extension part may include a plurality of extension parts having different diameters.

"A plurality of extension parts having different diameters may be formed.

"The extension part may be formed horizontally with the axial direction or at least one of the inner surface and an outer surface of the extension part may be formed to be tapered.

"The extension part may be formed in a continuous or interrupted manner in a circumferential direction.

"The thrust plate may include a flat part formed to be extended from an end of the extension part in an outer diameter direction so as to support the extension part, and the flat part may have a disk shape or a doughnut shape.

"The thrust plate may be a stopper contacting the sleeve to prevent excessive floating of the shaft.

"At least one of upper or lower surfaces of the thrust plate may be provided with a thrust dynamic groove.

"According to another aspect of the present invention, there is provided a motor including: the hydrodynamic bearing assembly of the present invention; a stator coupled to an outer circumferential surface of a sleeve and including a core having a coil for generating rotational driving force wound therearound; and a rotor having a magnet mounted on one surface thereof to be rotatable with respect to the stator, the magnet facing the coil."

For the URL and additional information on this patent, see: Noh, Jee Ae; Lee, Ta Kyoung. Hydrodynamic Bearing Assembly and Motor Including the Same. U.S. Patent Number 8810089, filed July 11, 2011, and published online on August 19, 2014. Patent URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=8810089.PN.&OS=PN/8810089RS=PN/8810089

Keywords for this news article include: Samsung Electro-Mechanics Co. Ltd.

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC


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Source: Journal of Engineering


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