Patents by Inventor Chang Jo Yu

Chang Jo Yu has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 8896173
    Abstract: There is provided a spindle motor including: upper and lower thrust parts fixedly installed on a shaft; a reception part formed in the rotor hub to thereby receive an end portion of the upper thrust part and form an oil interface together with the upper thrust part; and a clamp fixing part inserted into the reception part while having a clearance with the upper thrust part, and guiding a position of a clamp for fixing the recording medium.
    Type: Grant
    Filed: February 14, 2012
    Date of Patent: November 25, 2014
    Assignee: Samsung Electro-Mechanics Co., Ltd.
    Inventors: Shin Young Cheong, Chang Jo Yu
  • Patent number: 8585289
    Abstract: There is provided a spindle motor including: a lower thrust member fixedly attached to a base member; a shaft fixedly attached to at least one of the lower thrust member and the base member; a sleeve disposed on an upper portion of the lower thrust member and rotatably installed on the shaft; a rotor hub coupled to the sleeve to thereby rotate together therewith; and an upper thrust member fixedly attached to an upper end portion of the shaft and forming a liquid-vapor interface together therewith, wherein the sleeve has an inclination part formed at an upper end portion thereof so as to form the liquid-vapor interface together with the upper thrust member, the inclination part having an outer diameter larger in an upper portion thereof than in a lower portion thereof.
    Type: Grant
    Filed: November 1, 2011
    Date of Patent: November 19, 2013
    Assignee: Samsung Electro-Mechanics Co., Ltd.
    Inventor: Chang Jo Yu
  • Publication number: 20130234551
    Abstract: There are provided a hydrodynamic bearing assembly and a spindle motor including the same. The hydrodynamic bearing assembly includes: a sleeve supporting a shaft and forming a bearing clearance between the sleeve and the shaft, the bearing clearance filled with a lubricating fluid; a housing partially enclosing an outer peripheral surface of the sleeve; a rotor hub coupled to the upper end portion of the shaft and including an extension wall part partially facing an upper end portion of the sleeve and partially extended to be disposed outwardly of the housing; a stopper provided on a lower end portion of the shaft to be protruded outwardly in a radial direction to be caught by a lower end portion of the sleeve; and a circulation hole provided between the sleeve and the housing to allow a lower portion of the sleeve to communicate with an upper end portion of the housing.
    Type: Application
    Filed: February 15, 2013
    Publication date: September 12, 2013
    Applicant: SAMSUNG ELECTRO-MECHANICS CO., LTD.
    Inventor: Chang Jo YU
  • Publication number: 20130163116
    Abstract: There is provided a spindle motor. The spindle motor includes a fixed member; and a rotating member rotating relatively to the fixed member, and having oil filling a bearing clearance formed between the fixed member and the rotating member, wherein the fixed member and the rotating member are provided with an oil diffusion path communicating an air/oil interface formed at a boundary between the oil filled in the bearing clearance and air with the outside, and at least one of the fixed member and the rotating member is provided with at least one dummy oil groove opened to the oil diffusion path and having oil filled in at least a portion of the inside thereof.
    Type: Application
    Filed: March 16, 2012
    Publication date: June 27, 2013
    Applicant: SAMSUNG ELECTRO-MECHANICS CO., LTD.
    Inventors: Hyun Ho SHIN, Chang Jo YU
  • Publication number: 20130162080
    Abstract: There are provided a hydrodynamic bearing assembly and a motor including the same. The hydrodynamic bearing assembly includes: a sleeve supporting a shaft and forming a bearing clearance filled with a lubricating fluid; a housing enclosing an outer peripheral surface of the sleeve and including a flange part formed in an upper end portion thereof and extended outwardly; a rotor hub coupled to an upper end portion of the shaft and including an extension wall part extended to be disposed outwardly of the housing; a stopper member fixed to the extension wall part while being disposed under the flange part of the housing, and forming, together with an outer peripheral surface of the housing, a space in which a liquid-vapor interface is formed; and a cover member coupled to a lower end portion of the housing. The sleeve and the housing include first and second circulation holes formed therebetween.
    Type: Application
    Filed: March 20, 2012
    Publication date: June 27, 2013
    Applicant: SAMSUNG ELECTRO-MECHANICS CO., LTD.
    Inventor: Chang Jo YU
  • Patent number: 8467145
    Abstract: There is provided a spindle motor. The spindle motor includes a fixed member; and a rotating member rotating relatively to the fixed member, and having oil filling a bearing clearance formed between the fixed member and the rotating member, wherein the fixed member and the rotating member are provided with an oil diffusion path communicating an air/oil interface formed at a boundary between the oil filled in the bearing clearance and air with the outside, and at least one of the fixed member and the rotating member is provided with at least one dummy oil groove opened to the oil diffusion path and having oil filled in at least a portion of the inside thereof.
    Type: Grant
    Filed: March 16, 2012
    Date of Patent: June 18, 2013
    Assignee: Samsung Electro-Mechanics Co., Ltd.
    Inventors: Hyun Ho Shin, Chang Jo Yu
  • Publication number: 20130147308
    Abstract: There is provided a spindle motor including: a base part having a lower end portion of a shaft fixed thereto; a rotating member rotatably installed with respect to the shaft and forming a bearing clearance with the shaft, the bearing clearance being filled with a lubricating fluid; a coupling member fixedly installed on the rotating member and including an inclined surface allowing an interface between the lubricating fluid filling the bearing clearance and air to be formed; and an upper thrust member fixed to the shaft so as to form the interface between the lubricating fluid and air, with the coupling member.
    Type: Application
    Filed: February 16, 2012
    Publication date: June 13, 2013
    Applicant: SAMSUNG ELECTRO-MECHANICS CO., LTD.
    Inventor: Chang Jo YU
  • Publication number: 20130142461
    Abstract: There is provided a spindle motor including: a shaft; a sleeve rotatably supporting the shaft and forming a bearing clearance therewith filled with a lubricating fluid; a cover member installed on a lower end portion of the sleeve; a rotor hub coupled to an upper end portion of the shaft and having an extension wall part extended downwardly in an axial direction, to be disposed outwardly of the sleeve in a radial direction; and a stopper member fixedly installed on the extension wall part, and forming, together with an outer peripheral surface of the sleeve, a space having a liquid-vapor interface formed therein, the sleeve including a circulation hole formed therein to connect upper and lower portions thereof, the circulation hole being connected to a space formed by the stopper member and the outer peripheral surface of the sleeve.
    Type: Application
    Filed: February 16, 2012
    Publication date: June 6, 2013
    Applicant: SAMSUNG ELECTRO-MECHANICS CO., LTD.
    Inventor: Chang Jo YU
  • Publication number: 20130129268
    Abstract: There is provided a spindle motor including: a shaft having a lower end portion fixed into a base member; a thrust plate fixed to the shaft; an upper sleeve disposed above the thrust plate and forming a first bearing clearance with the shaft; a lower sleeve disposed below the thrust plate and forming a second bearing clearance with the shaft; and a rotor hub rotating together with the upper and lower sleeves, wherein the upper sleeve includes an extension part extended toward the lower sleeve, and the lower sleeve includes a clearance adjusting part disposed to face the extension part when being coupled to the upper sleeve and extended toward the upper sleeve.
    Type: Application
    Filed: February 14, 2012
    Publication date: May 23, 2013
    Applicant: SAMSUNG ELECTRO-MECHANICS CO., LTD.
    Inventors: Shin Young CHEONG, Ju Ho Kim, Chang Jo Yu
  • Publication number: 20130099613
    Abstract: There is provided a spindle motor including: upper and lower thrust parts fixedly installed on a shaft; a reception part formed in the rotor hub to thereby receive an end portion of the upper thrust part and form an oil interface together with the upper thrust part; and a clamp fixing part inserted into the reception part while having a clearance with the upper thrust part, and guiding a position of a clamp for fixing the recording medium.
    Type: Application
    Filed: February 14, 2012
    Publication date: April 25, 2013
    Applicant: SAMSUNG ELECTRO-MECHANICS CO., LTD.
    Inventors: Shin Young Cheong, Chang Jo Yu
  • Publication number: 20130082554
    Abstract: There is provided a spindle motor including: a lower thrust member fixed to a base member; a shaft fixed to at least one of the lower thrust member and the base member; a sleeve formed above the lower thrust member and provided to be rotatable with the shaft, wherein the sleeve, together with the lower thrust member, forms a lubricating fluid liquid-vapor interface and a lower sealing portion; a rotor hub coupled to the sleeve and rotating together therewith; and an upper thrust member fixed to an upper end portion of the shaft, wherein the upper thrust member, together with the sleeve, forms a lubricating fluid liquid-vapor interface and an upper sealing portion, wherein either of the upper sealing portion and the lower sealing portion has a greater volume of sealed lubricating fluid than the other.
    Type: Application
    Filed: December 12, 2011
    Publication date: April 4, 2013
    Applicant: SAMSUNG ELECTRO-MECHANICS CO., LTD.
    Inventor: Chang Jo YU
  • Patent number: 8388227
    Abstract: A hydrodynamic bearing assembly according to an aspect of the invention may include: a sleeve against which a shaft is supported so that an upper end of the shaft, being compressed and inserted into a hub base of a rotor case, protrudes upwardly in an axial direction; a first oil sealing unit having a first oil interface provided between the hub base and a counterpart component arranged downwardly in the axial direction; and a second oil sealing unit communicating with the first oil sealing unit through a communication channel and being tapered to form a second oil interface inside or outside the sleeve, wherein oil in the first oil sealing unit moves toward the second oil sealing unit along an inner diameter direction by a rotation of the rotor case.
    Type: Grant
    Filed: May 11, 2010
    Date of Patent: March 5, 2013
    Assignee: Samsung Electro-Mechanics Co., Ltd.
    Inventor: Chang Jo Yu
  • Publication number: 20130033137
    Abstract: A spindle motor including: a lower thrust member fixedly coupled to a base member; a shaft fixedly coupled to at least one of the lower thrust member and the base member; a sleeve disposed on an upper portion of the lower thrust member and rotatably installed on the shaft; a rotor hub coupled to the sleeve to thereby rotate together with the sleeve; an upper thrust member fixedly coupled to an upper end portion of the shaft and forming a liquid-vapor interface together with the sleeve; and a cover member fixedly coupled to the shaft so as to be disposed on an upper portion of the upper thrust member, wherein the upper thrust member includes a stepped jaw part having a lower surface supported by an upper surface of the shaft and an upper surface pressed by the cover member, so as to increase coupling strength with the shaft.
    Type: Application
    Filed: October 17, 2011
    Publication date: February 7, 2013
    Applicant: SAMSUNG ELECTRO-MECHANICS CO., LTD.
    Inventor: Chang Jo Yu
  • Publication number: 20130033138
    Abstract: There is provided a spindle motor including: a shaft fixedly coupled to a base member; a stationary unit coupled to the shaft so as to be disposed over the base member; and a sleeve member forming a bearing clearance with the stationary unit to be filled with lubricating fluid, wherein the stationary unit includes a plurality of stationary members and the plurality of stationary members are disposed to be opposed to each other while being spaced apart from each other by a predetermined interval so as to have the lubricating fluid interposed therebetween, the stationary members including a liquid-vapor interface formed therebetween.
    Type: Application
    Filed: November 1, 2011
    Publication date: February 7, 2013
    Applicant: Samsung Electro-Mechanics Co., Ltd.
    Inventor: Chang Jo Yu
  • Publication number: 20130022298
    Abstract: There is provided a spindle motor including: a lower thrust member fixedly attached to a base member; a shaft fixedly attached to at least one of the lower thrust member and the base member; a sleeve disposed on an upper portion of the lower thrust member and rotatably installed on the shaft; a rotor hub coupled to the sleeve to thereby rotate together therewith; and an upper thrust member fixedly attached to an upper end portion of the shaft and forming a liquid-vapor interface together therewith, wherein the sleeve has an inclination part formed at an upper end portion thereof so as to form the liquid-vapor interface together with the upper thrust member, the inclination part having an outer diameter larger in an upper portion thereof than in a lower portion thereof.
    Type: Application
    Filed: November 1, 2011
    Publication date: January 24, 2013
    Applicant: Samsung Electro-Mechanics Co., Ltd.
    Inventor: Chang Jo Yu
  • Publication number: 20120288223
    Abstract: There are provided a hydrodynamic bearing assembly and a motor having the same, the hydrodynamic bearing assembly including a shaft rotating together with a rotor case; and a sleeve rotatably supporting the shaft, wherein at least one of the shaft and the sleeve has first and second dynamic pressure grooves formed therein, the first dynamic pressure groove being disposed in an upper portion of at least one of the shaft and the sleeve in an axial direction and having a herringbone shape and the second dynamic pressure groove being disposed in a lower portion of at least one of the shaft and the sleeve in the axial direction so as to be spaced apart from the first dynamic pressure groove and having a spiral shape.
    Type: Application
    Filed: July 28, 2011
    Publication date: November 15, 2012
    Applicant: SAMSUNG ELECTRO-MECHANICS CO., LTD.
    Inventor: Chang Jo Yu
  • Patent number: 8304946
    Abstract: The present invention provides a spindle motor which has superior operating characteristics. The spindle motor includes a stationary support shaft which is fastened to a base plate, a thrust plate which is fitted over the stationary support shaft, a sleeve which is rotatably provided around the stationary support shaft and is coupled to a rotor casing, and an annular stopper which is fastened to the sleeve or the rotor casing to support the lower surface of the thrust plate and prevent the sleeve from being removed. A first fluid sealing part is formed between the stopper and the thrust plate. The spindle motor further includes an annular sealing cap which is coupled to the sleeve or the rotor casing to store fluid between the sealing cap and an upper surface of the sleeve. A second fluid sealing part is formed between the sealing cap and the stationary support shaft.
    Type: Grant
    Filed: March 13, 2009
    Date of Patent: November 6, 2012
    Assignee: Samsung Electro-Mechanics Co., Ltd.
    Inventors: Chang Jo Yu, Duck Young Kim
  • Patent number: 8198771
    Abstract: A motor includes a sleeve supporting a shaft such that an upper end of the shaft protrudes upwardly along an axial direction, a sleeve housing in which an outer diameter portion of the sleeve is inserted and supported, an oil sealing cap covering the sleeve at an opposite side of the sleeve housing, and having a sealing protrusion protruding from a top surface thereof to form a capillary seal of oil between the shaft and the sleeve, and a hub base pressure-fitted and fixed on the upper end of the shaft, and having a hub-base outer diameter portion facing the sealing protrusion and forming a first oil sealing part with the sealing protrusion.
    Type: Grant
    Filed: November 12, 2009
    Date of Patent: June 12, 2012
    Assignee: Samsung Electro-Mechanics Co., Ltd.
    Inventor: Chang Jo Yu
  • Publication number: 20120127847
    Abstract: There is provided a motor including a rotating member coupled with a shaft and rotating in connection with the shaft, and a fixing member having the shaft inserted thereinto to support the shaft and including a round part whose outer surface corresponding to the rotating member is formed to be rounded to thereby allow oil to be sealed between the round part and the rotating member.
    Type: Application
    Filed: February 2, 2011
    Publication date: May 24, 2012
    Applicant: SAMSUNG ELECTRO-MECHANICS CO., LTD.
    Inventor: Chang Jo Yu
  • Publication number: 20120049677
    Abstract: There is provided a motor including: a fixing member inserted with a shaft and supporting the rotation of the shaft; a rotating member rotating while interworking with the shaft; a stopper part formed on one of the fixing member and the rotating member to prevent the rotating member from floating; an anti-floating part formed on the other one of the fixing member and the rotating member and interfering with the stopper part to prevent the rotating member from floating; and a leakage preventing part sealing oil between the stopper part and the anti-floating part and formed to be protruded on at least one of the stopper part and the anti-floating part to minimize an oil sealing gap between the stopper part and the anti-floating part.
    Type: Application
    Filed: January 14, 2011
    Publication date: March 1, 2012
    Applicant: SAMSUNG ELECTRO-MECHANICS CO., LTD.
    Inventor: Chang Jo Yu