With Lubrication Patents (Class 378/133)
  • Patent number: 10748736
    Abstract: Methods and systems for realizing a high brightness, liquid based x-ray source suitable for high throughput x-ray metrology are presented herein. A high brightness x-ray source is produced by bombarding a rotating liquid metal anode material with a stream of electrons to generate x-ray radiation. A rotating anode support structure supports the liquid metal anode material in a fixed position with respect to the support structure while rotating at the constant angular velocity. In another aspect, a translational actuator is coupled to the rotating assembly to translate the liquid metal anode in a direction parallel to the axis of rotation. In another aspect, an output window is coupled to the rotating anode support structure. Emitted x-rays are transmitted through the output window toward the specimen under measurement. In another further aspect, a containment window maintains the shape of the liquid metal anode material independent of rotational angular velocity.
    Type: Grant
    Filed: October 16, 2018
    Date of Patent: August 18, 2020
    Assignee: KLA-Tencor Corporation
    Inventor: Sergey Zalubovsky
  • Patent number: 10734185
    Abstract: In one embodiment, a rotating anode type X-ray tube comprises a fixed shaft having a first surface, a rotor, a cathode emitting electrons, and an anode target. The rotor comprises a first cylinder having a second surface, a second cylinder, and a third cylinder. A first threaded portion on an inner surface of the first cylinder and a second threaded portion on an outer peripheral surface of the third cylinder are tightened. A screw member is screwed in a third threaded portion on an inner peripheral surface of a hole which penetrates the third cylinder, and a tip portion of the screw member presses the second cylinder against the second surface.
    Type: Grant
    Filed: July 13, 2017
    Date of Patent: August 4, 2020
    Assignee: Canon Electron Tubes & Devices Co., Ltd.
    Inventor: Tetsuya Yonezawa
  • Patent number: 10460901
    Abstract: A liquid metal or spiral groove bearing structure for an x-ray tube and associated process for manufacturing the bearing structure is provided that includes a bearing shaft rotatably disposed in a bearing housing or shell. The shell includes a thrust seal engaged with a sleeve to maintain co-axiality for the rotating liquid metal seal formed in the shell about the shaft. The shaft has a bore for the introduction of a cooling fluid into the bearing assembly in which is disposed a cooling tube. The cooling tube includes turbulence-inducing features to increase the turbulence of the cooling fluid flowing through the cooling tube, consequently enhancing the heat exchange between the cooling fluid and the shaft. This maximizes the heat transfer from the shaft to the oil, allowing materials with lower thermal conductivities, such as non-refractory materials, to be used to form the bearing shaft and shell.
    Type: Grant
    Filed: September 29, 2017
    Date of Patent: October 29, 2019
    Assignee: General Electric Company
    Inventor: Kevin Shane Kruse
  • Patent number: 10460900
    Abstract: There is provided an X-ray tube device having a configuration for preventing peeled-off solid lubrication films from scattering in an X-ray tube even when the solid lubrication film peels off a rotary bearing. The X-ray tube device includes: an anode (212) that is irradiated with an electron beam, thereby emitting X-rays; a rotary bearing (304) that rotatably supports the anode (212); a solid lubrication film which is formed on a front surface of the rotary bearing (304) and into which a ferromagnet is mixed from the rotary bearing (304); and an attractor (303) which attracts, with a magnetic force, the solid lubrication film that peels off the rotary bearing (304).
    Type: Grant
    Filed: October 19, 2015
    Date of Patent: October 29, 2019
    Assignee: Hitachi, Ltd.
    Inventor: Yoshitaka Seki
  • Patent number: 9890812
    Abstract: A liquid metal bearing includes at least one first bearing part and at least one second bearing part that have a non-positive fit connection to one another. At least one first ductile sealing layer is disposed at least partly between at least a first bearing part of the at least one bearing and a second bearing part of the at least one second bearing part.
    Type: Grant
    Filed: August 12, 2014
    Date of Patent: February 13, 2018
    Assignee: Siemens Aktiengesellschaft
    Inventors: Ronald Dittrich, Manfred Fuchs
  • Publication number: 20150049861
    Abstract: A liquid metal bearing includes at least one first bearing part and at least one second bearing part that have a non-positive fit connection to one another. At least one first ductile sealing layer is disposed at least partly between at least a first bearing part of the at least one bearing and a second bearing part of the at least one second bearing part.
    Type: Application
    Filed: August 12, 2014
    Publication date: February 19, 2015
    Inventors: Ronald Dittrich, Manfred Fuchs
  • Publication number: 20140369475
    Abstract: The present disclosure is directed towards the prevention of high voltage instabilities within X-ray tubes. For example, in one embodiment, an X-ray tube is provided. The X-ray tube generally includes a stationary member, and a rotary member configured to rotate with respect to the stationary member during operation of the X-ray tube. The X-ray tube also includes a liquid metal bearing material disposed in a space between the shaft and the sleeve, a seal disposed adjacent to the space to seal the liquid metal bearing material in the space, and an enhanced surface area material disposed on a side of the seal axially opposite the space and configured to trap within the enhanced surface area material liquid metal bearing material that escapes the seal.
    Type: Application
    Filed: August 29, 2014
    Publication date: December 18, 2014
    Inventors: Ian Strider Hunt, Donald Robert Allen, Kenwood Dayton, Andrew Triscari
  • Publication number: 20140355743
    Abstract: A bearing assembly is disclosed that includes a sleeve having an opening formed therein and a shaft positioned within the opening of the sleeve such that a gap is formed between an inner surface of the sleeve and an outer surface of the shaft. A lubricant is disposed in the gap and a plurality of grooves are formed on at least one of the outer surface of the shaft and the inner surface of the sleeve. An anti-wetting coating is disposed on the at least one of the outer surface of the shaft and the inner surface of the sleeve between adjacent grooves of the plurality of grooves.
    Type: Application
    Filed: May 31, 2013
    Publication date: December 4, 2014
    Inventors: Ian Strider Hunt, Ben David Poquette, Andrew Thomas Triscari
  • Patent number: 8855270
    Abstract: An x-ray tube includes a frame enclosing a high vacuum, a cathode positioned within the enclosure, a bearing assembly a stationary component comprised of a first base substrate, the first base substrate having a first surface, a rotatable component comprised of a second base substrate, the second base substrate having a second surface, wherein the rotatable component is positioned proximate the stationary component such that a gap is formed between the first surface and the second surface, a liquid metal positioned within the gap, and an antiwetting coating attached to at least one of the first surface and the second surface, the coating includes titanium nitride attached to the at least one of the first surface and the second surface, and an oxide of titanium attached to the titanium nitride.
    Type: Grant
    Filed: March 6, 2012
    Date of Patent: October 7, 2014
    Assignee: General Electric Company
    Inventors: Donald Robert Allen, Michael John Danyluk
  • Patent number: 8848875
    Abstract: The present disclosure is directed towards the prevention of high voltage instabilities within X-ray tubes. For example, in one embodiment, an X-ray tube is provided. The X-ray tube generally includes a stationary member, and a rotary member configured to rotate with respect to the stationary member during operation of the X-ray tube. The X-ray tube also includes a liquid metal bearing material disposed in a space between the shaft and the sleeve, a seal disposed adjacent to the space to seal the liquid metal bearing material in the space, and an enhanced surface area material disposed on a side of the seal axially opposite the space and configured to trap within the enhanced surface area material liquid metal bearing material that escapes the seal.
    Type: Grant
    Filed: October 29, 2010
    Date of Patent: September 30, 2014
    Assignee: General Electric Company
    Inventors: Ian Strider Hunt, Donald Robert Allen, Kenwood Dayton, Andrew Triscari
  • Publication number: 20140247922
    Abstract: According to one embodiment, a rotating anode X-ray tube includes a fixed shaft, a rotor, a lubricant, target, and a supporting member. The fixed shaft includes a small-diameter portion provided with a first radial bearing surface including first grooved surfaces, and a large-diameter portion provided with a second radial bearing surface including second grooved surfaces. The rotor includes a third radial bearing surface. The lubricant is filled in a gap between the fixed shaft and the rotor, and drawn by the first and second grooved surfaces.
    Type: Application
    Filed: February 26, 2014
    Publication date: September 4, 2014
    Applicants: KABUSHIKI KAISHA TOSHIBA, Toshiba Electron Tubes & Devices Co., Ltd.
    Inventors: Masataka UEKI, Yasutaka ITO
  • Publication number: 20130235978
    Abstract: An x-ray tube includes a frame enclosing a high vacuum, a cathode positioned within the enclosure, a bearing assembly a stationary component comprised of a first base substrate, the first base substrate having a first surface, a rotatable component comprised of a second base substrate, the second base substrate having a second surface, wherein the rotatable component is positioned proximate the stationary component such that a gap is formed between the first surface and the second surface, a liquid metal positioned within the gap, and an antiwetting coating attached to at least one of the first surface and the second surface, the coating includes titanium nitride attached to the at least one of the first surface and the second surface, and an oxide of titanium attached to the titanium nitride.
    Type: Application
    Filed: March 6, 2012
    Publication date: September 12, 2013
    Inventors: Donald Robert Allen, Michael John Danyluk
  • Publication number: 20130070902
    Abstract: An x-ray tube includes a cathode and a target assembly positioned to receive electrons emitted from the cathode. The target assembly includes a target, and a spiral groove bearing (SGB) configured to support the target. The SGB includes a rotatable component having a first surface and a first material attached to the first surface, a stationary component having a second surface and a second material attached to the second surface, the stationary component positioned such that a gap is formed between the first material and the second material, and a liquid metal positioned in the gap, wherein at least one of the first and second materials comprises tantalum.
    Type: Application
    Filed: November 13, 2012
    Publication date: March 21, 2013
    Applicant: GENERAL ELECTRIC COMPANY
    Inventor: General Electric Company
  • Patent number: 8363787
    Abstract: An x-ray tube includes a cathode and a target assembly positioned to receive electrons emitted from the cathode. The target assembly includes a target, and a spiral groove bearing (SGB) configured to support the target. The SGB includes a rotatable component having a first surface and a first material attached to the first surface, a stationary component having a second surface and a second material attached to the second surface, the stationary component positioned such that a gap is formed between the first material and the second material, and a liquid metal positioned in the gap, wherein at least one of the first and second materials comprises tantalum.
    Type: Grant
    Filed: March 3, 2010
    Date of Patent: January 29, 2013
    Assignee: General Electric Company
    Inventor: Michael Allan Lathrop
  • Patent number: 8218730
    Abstract: A mechanism to which a liquid-repellent structure hard to be exfoliated is applied. The tip of each of microprojections has a generally spherical surface. When a liquid metal (8) comes into contact with such a surface, the liquid metal (8) cannot enter the spaces among microprojections and is supported by the surfaces of the tips only with point contact. Therefore, the liquid metal (8) neither wets the surface of the base material nor spread over the surface. The liquid-repellent surface (11) has a structure such that the liquid metal (8) is supported by point contact of the many microprojections and repelled by the surface (11), and does not wet the surface (11).
    Type: Grant
    Filed: June 12, 2008
    Date of Patent: July 10, 2012
    Assignee: Hitachi Medical Corporation
    Inventor: Hidefumi Okamura
  • Patent number: 8009806
    Abstract: An x-ray tube includes a center shaft having an inner surface and an outer surface, the inner surface forming a portion of a cavity therein, a mount having an inner surface, the mount having an x-ray target attached thereto, and a liquid metal positioned between the outer surface of the center shaft and the inner surface of the mount. The x-ray tube further includes a flow diverter positioned in the cavity, the flow diverter having a wall with an inner surface, and a plurality of jets passing through the wall, wherein the plurality of jets are configured such that when a fluid is flowed into the flow diverter and passes along its inner surface, a portion of the fluid passes through the plurality of jets and is directed toward the inner surface of the center shaft.
    Type: Grant
    Filed: July 13, 2009
    Date of Patent: August 30, 2011
    Assignee: General Electric Company
    Inventor: Edwin L. Legall
  • Patent number: 7974384
    Abstract: An x-ray tube includes a vacuum enclosure, a shaft having a first end and a second end, a flange attached to the first end of the shaft, the flange having an outer perimeter, and a ferrofluid seal assembly having an inner bore, the inner bore having an outer perimeter smaller than the outer perimeter of the flange. The shaft is inserted through the bore of the ferrofluid seal assembly such that the ferrofluid seal assembly is positioned between the first end of the shaft and the second end of the shaft and such that the first end extends into the vacuum enclosure, and the ferrofluid seal is configured to fluidically seal the vacuum enclosure from an environment into which the second end of the shaft extends.
    Type: Grant
    Filed: April 14, 2009
    Date of Patent: July 5, 2011
    Assignee: General Electric Company
    Inventors: Edwin L. Legall, Mark Alan Frontera, Michael Scott Hebert
  • Publication number: 20110129068
    Abstract: The present invention is related to high power X-ray sources, in particular to those ones that are equipped with rotating X-ray anodes capable of delivering a much higher short time peak power than conventional rotating X-ray anodes according to the prior art. The herewith proposed design principle thereby aims at overcoming thermal limitation of peak power by allowing extremely fast rotation of the anode and by introducing a lightweight material with high thermal conductivity (2) in the region adjacent to the focal track material (4). The extremely fast rotation is enabled by providing sections of the rotary anode disk made of anisotropic high specific strength materials with high thermal stability (1, 3, 6) which will be specifically adapted to the high stresses building up when the anode is operated, as for example fiber-reinforced ceramic materials.
    Type: Application
    Filed: August 12, 2008
    Publication date: June 2, 2011
    Applicant: KONINKLIJKE PHILIPS ELECTRONICS N.V.
    Inventors: Astrid Lewalter, Rainer Pietig, Albert Langkamp, Heiko Richter, Thomas Behnisch, Werner Huffenbach, Rolf K.O. Behling, Christoph Bathe
  • Patent number: 7933382
    Abstract: An x-ray tube includes a cathode and a target assembly positioned to receive electrons emitted from the cathode. The target assembly includes a target and a spiral groove bearing (SGB) configured to support the target. The SGB includes a rotatable component having a first surface and a first material attached to the first surface, a stationary component having a second surface and a second material attached to the second surface, the stationary component positioned such that a gap is formed between the first material and the second material, and a liquid metal positioned in the gap. At least one of the first and second materials has a thickness greater than 0.1 mm.
    Type: Grant
    Filed: March 25, 2009
    Date of Patent: April 26, 2011
    Assignee: General Electric Company
    Inventors: Ian Strider Hunt, Gregory Alan Steinlage, Kenwood Dayton, Thomas C. Tiearney, Jr.
  • Publication number: 20100246774
    Abstract: An x-ray tube includes a cathode and a target assembly positioned to receive electrons emitted from the cathode. The target assembly includes a target, and a spiral groove bearing (SGB) configured to support the target. The SGB includes a rotatable component having a first surface and a first material attached to the first surface, a stationary component having a second surface and a second material attached to the second surface, the stationary component positioned such that a gap is formed between the first material and the second material, and a liquid metal positioned in the gap, wherein at least one of the first and second materials comprises tantalum.
    Type: Application
    Filed: March 3, 2010
    Publication date: September 30, 2010
    Inventor: Michael Allan Lathrop
  • Publication number: 20100246773
    Abstract: An x-ray tube includes a cathode and a target assembly positioned to receive electrons emitted from the cathode. The target assembly includes a target and a spiral groove bearing (SGB) configured to support the target. The SGB includes a rotatable component having a first surface and a first material attached to the first surface, a stationary component having a second surface and a second material attached to the second surface, the stationary component positioned such that a gap is formed between the first material and the second material, and a liquid metal positioned in the gap. At least one of the first and second materials has a thickness greater than 0.1 mm.
    Type: Application
    Filed: March 25, 2009
    Publication date: September 30, 2010
    Inventors: Ian Strider Hunt, Gregory Alan Steinlage, Kenwood Dayton, Thomas C. Tierney, JR.
  • Patent number: 7801278
    Abstract: In an X-ray tube, a rotary anode formed into a hollow disk-like shape is fixedly supported by a rotating body formed into a hollow cylindrical shape. A fixed shaft has fixed ends, columnar bearing portions and a disk part, and a flow path of a cooling medium formed along a central axis thereof. The bearing portions are inserted into the rotating body with a first gap between the columnar bearing portion and the rotating body, so that the rotating body is rotatably supported. The disk part is arranged in the rotary anode with a second gap between the disk part and the rotary anode. The first and second gaps are filled with a lubricant, bearing grooves are formed in the bearing portion, thereby forming dynamic pressure bearings, and a center of gravity of the rotary anode is arranged between the first and second dynamic pressure bearings.
    Type: Grant
    Filed: March 20, 2009
    Date of Patent: September 21, 2010
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Yasutaka Ito, Hitoshi Hattori, Yasuo Yoshii, Chiharu Tadokoro, Hironori Nakamuta, Tetsuya Yonezawa
  • Publication number: 20100166149
    Abstract: A mechanism to which a liquid-repellent structure hard to be exfoliated is applied. The tip of each of microprojections has a generally spherical surface. When a liquid metal (8) comes into contact with such a surface, the liquid metal (8) cannot enter the spaces among microprojections and is supported by the surfaces of the tips only with point contact. Therefore, the liquid metal (8) neither wets the surface of the base material nor spread over the surface. The liquid-repellent surface (11) has a structure such that the liquid metal (8) is supported by point contact of the many microprojections and repelled by the surface (11), and does not wet the surface (11).
    Type: Application
    Filed: June 12, 2008
    Publication date: July 1, 2010
    Applicant: HITACHI MEDICAL CORPORATION
    Inventor: Hidefumi Okamura
  • Patent number: 7746982
    Abstract: In a rotary anode X-ray tube, a disc portion is fitted into a rotary anode with a first gap therebetween and a fixed shaft is fitted into a rotary shaft to support the anode with a second gap therebetween. The disc portion and the fixed shaft are formed integral with each other to have a hollow portion therein. A cooling liquid is allowed to flow through the hollow portion. A liquid metal is filled in the first and second gaps. Dynamic pressure type bearings is formed in the second gap. A passage is formed to directly communicate the first gap to the second gap, whereby the liquid metal being directly supplied from the second gap to the first gap. Thus, the liquid metal can be fed rapidly and surely into the gap between the anode target and a cooling vessel.
    Type: Grant
    Filed: September 16, 2008
    Date of Patent: June 29, 2010
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Yasuo Yoshii, Chiharu Tadokoro, Yasutaka Ito, Hitoshi Hattori, Hironori Nakamuta, Tetsuya Yonezawa
  • Publication number: 20100128848
    Abstract: An x-ray tube having a liquid lubricated bearing assembly and a liquid cooled anode target. The anode target and bearing assembly having increased lubrication and cooling to withstand higher power, higher temperature and higher load applications.
    Type: Application
    Filed: November 21, 2008
    Publication date: May 27, 2010
    Applicant: GENERAL ELECTRIC COMPANY
    Inventors: Liangheng Qiu, Gregory Alan Lehmann, Thomas Dean Scaefer, Michael Scott Hebert, Edwin L. Legall
  • Patent number: 7697665
    Abstract: A rotating anode X-ray tube includes a fixed body having a radial sliding bearing surface and a channel therein through which a coolant flows, a rotor including a discoid large-diameter portion, which has a recess fitted with one end portion of the fixed body with a clearance therebetween and constitutes an anode target, and a small-diameter portion, which has on an inner surface thereof a radial sliding bearing surface which faces the aforesaid radial sliding bearing surface with a clearance, and is united with the large-diameter portion at one end portion thereof, a lubricant filling the clearances, a cathode arranged opposite to the anode target, and a vacuum envelope which contains the fixed body, the rotor, the lubricant and the cathode, and fixes the fixed body at another end portion of the fixed body situated opposite the one end portion of the fixed body fitted in the recess.
    Type: Grant
    Filed: May 20, 2009
    Date of Patent: April 13, 2010
    Assignees: Kabushiki Kaisha Toshiba, Toshiba Electron Tubes & Devices Co., Ltd.
    Inventors: Tetsuya Yonezawa, Hironori Nakamuta, Ryoichi Takahashi, Yasuo Yoshii, Hitoshi Hattori, Yasutaka Ito
  • Publication number: 20090245469
    Abstract: In an X-ray tube, a rotary anode formed into a hollow disk-like shape is fixedly supported by a rotating body formed into a hollow cylindrical shape. A fixed shaft has fixed ends, columnar bearing portions and a disk part, and a flow path of a cooling medium formed along a central axis thereof. The bearing portions are inserted into the rotating body with a first gap between the columnar bearing portion and the rotating body, so that the rotating body is rotatably supported. The disk part is arranged in the rotary anode with a second gap between the disk part and the rotary anode. The first and second gaps are filled with a lubricant, bearing grooves are formed in the bearing portion, thereby forming dynamic pressure bearings, and a center of gravity of the rotary anode is arranged between the first and second dynamic pressure bearings.
    Type: Application
    Filed: March 20, 2009
    Publication date: October 1, 2009
    Inventors: Yasutaka Ito, Hitoshi Hattori, Yasuo Yoshii, Chiharu Todokoro, Hironori Nakamuta, Tetsuya Yonezawa
  • Publication number: 20090225950
    Abstract: A rotating anode X-ray tube includes a fixed body having a radial sliding bearing surface and a channel therein through which a coolant flows, a rotor including a discoid large-diameter portion, which has a recess fitted with one end portion of the fixed body with a clearance therebetween and constitutes an anode target, and a small-diameter portion, which has on an inner surface thereof a radial sliding bearing surface which faces the aforesaid radial sliding bearing surface with a clearance, and is united with the large-diameter portion at one end portion thereof, a lubricant filling the clearances, a cathode arranged opposite to the anode target, and a vacuum envelope which contains the fixed body, the rotor, the lubricant and the cathode, and fixes the fixed body at another end portion of the fixed body situated opposite the one end portion of the fixed body fitted in the recess.
    Type: Application
    Filed: May 20, 2009
    Publication date: September 10, 2009
    Applicants: KABUSHIKI KAISHA TOSHIBA, Toshiba Electron Tubes & Device Co., Ltd.
    Inventors: Tetsuya Yonezawa, Hironori Nakamuta, Ryoichi Takahashi, Yasuo Yoshii, Hitoshi Hattori, Yasutaka Ito
  • Publication number: 20090080616
    Abstract: In a rotary anode X-ray tube, a disc portion is fitted into a rotary anode with a first gap therebetween and a fixed shaft is fitted into a rotary shaft to support the anode with a second gap therebetween. The disc portion and the fixed shaft are formed integral with each other to have a hollow portion therein. A cooling liquid is allowed to flow through the hollow portion. A liquid metal is filled in the first and second gaps. Dynamic pressure type bearings is formed in the second gap. A passage is formed to directly communicate the first gap to the second gap, whereby the liquid metal being directly supplied from the second gap to the first gap. Thus, the liquid metal can be fed rapidly and surely into the gap between the anode target and a cooling vessel.
    Type: Application
    Filed: September 16, 2008
    Publication date: March 26, 2009
    Inventors: YASUO YOSHII, Chiharu Tadokoro, Yasutaka Ito, Hitoshi Hattori, Hironori Nakamuta, Tetsuya Yonezawa
  • Patent number: 7505564
    Abstract: A bearing assembly mounted in an x-ray tube includes a bearing race and a bearing ball positioned adjacent to the bearing race. A lubricant is deposited on a first portion of a bare metal of one of the bearing race and the bearing ball, and a metal matrix deposited on a second portion of the bare metal.
    Type: Grant
    Filed: October 23, 2006
    Date of Patent: March 17, 2009
    Assignee: General Electric Company
    Inventors: Krishnamurthy Anand, Dennis Michael Gray, Pazhayannur R. Subramanian, Srinidhi Sampath, Carey Shawn Rogers, Steven Alfred Tysoe, Richard Arthur Nardi
  • Patent number: 7492869
    Abstract: A bearing assembly for an x-ray tube is disclosed that includes a bearing race, a bearing ball positioned adjacent to the bearing race, and a combination coating deposited on one of the bearing race and the bearing ball. The combination coating includes titanium carbide and a solid lubricant.
    Type: Grant
    Filed: April 20, 2007
    Date of Patent: February 17, 2009
    Assignee: General Electric Company
    Inventors: Liangheng Qiu, Carey Shawn Rogers, Michael J. Danyluk, Dennis M. Gray
  • Patent number: 7492870
    Abstract: A method for manufacturing an x-ray tube bearing cage includes the step of forming a bearing cage from a carbon-carbon composite material. A coating is applied to the carbon-carbon composite bearing cage. The coating includes an outer layer formed of a dry film lubricant. The coated carbon-carbon composite bearing cage is included in a bearing assembly in the x-ray tube and forms a lubricious enclosure for bearing balls positioned therein to minimize wear and heat generation in the bearing assembly.
    Type: Grant
    Filed: May 11, 2007
    Date of Patent: February 17, 2009
    Assignee: General Electric Company
    Inventors: Myles Standish Peterson, II, Thomas Francis McNulty, Liangheng Qiu, Carey Shawn Rogers, Dalong Zhong
  • Publication number: 20080279336
    Abstract: A method for manufacturing an x-ray tube bearing cage includes the step of forming a bearing cage from a carbon-carbon composite material. A coating is applied to the carbon-carbon composite bearing cage. The coating includes an outer layer formed of a dry film lubricant. The coated carbon-carbon composite bearing cage is included in a bearing assembly in the x-ray tube and forms a lubricious enclosure for bearing balls positioned therein to minimize wear and heat generation in the bearing assembly.
    Type: Application
    Filed: May 11, 2007
    Publication date: November 13, 2008
    Inventors: Myles Standish Peterson, II, Thomas Francis McNulty, Liangheng Qiu, Carey Shawn Rogers, Dalong Zhong
  • Patent number: 7397897
    Abstract: A bearing assembly mounted in an x-ray tube includes a bearing race and a bearing ball positioned adjacent to the bearing race. A coating is deposited on one of the bearing race and the bearing ball includes a lubricant and a hard material having a hardness greater than a base material of the bearing race and a base material of the bearing ball.
    Type: Grant
    Filed: October 23, 2006
    Date of Patent: July 8, 2008
    Assignee: General Electric Company
    Inventors: Krishnamurhty Anand, Dennis Michael Gray, Pazhayannur R. Subramanian, Srinidhi Sampath, Carey Shawn Rogers, Steven Alfred Tysoe, Richard Arthur Nardi
  • Patent number: 7386094
    Abstract: A valve is provided to fill a chamber for holding a rotation shaft of a rotating anode in an X-ray tube. The valve has a needle supported on a seat. The needle maintains the vacuum in the tube. A sleeve can engage in the valve. The sleeve is hollow and has a cavity. This cavity can be connected to the vacuum or to a bottle under vacuum filled with a lubricant liquid. The sleeve is used to handle the needle. The sleeve furthermore bears on a rim of the valve by an O-ring joint. This joint maintains the vacuum when the needle is raised and when the tube under vacuum is connected to the cavity of the sleeve.
    Type: Grant
    Filed: December 20, 2005
    Date of Patent: June 10, 2008
    Assignee: General Electric Company
    Inventors: Thomas Saint-Martin, Thierry Godart, Jean-Marie Penato, Frédéric Dahan
  • Publication number: 20080107236
    Abstract: A system for controlling a gas load imposed upon a high vacuum chamber includes a first chamber enclosing a high vacuum and positioned within an ambient environment, a second chamber enclosing a gas and positioned within the ambient environment adjacent to the first chamber, and a rotatable shaft having a first portion extending into the first chamber and a second portion extending into the second chamber. A ferrofluid seal is positioned about the rotatable shaft and positioned between the first portion and the second portion and the ferrofluid seal fluidically separates the first chamber from the second chamber. A control unit is attached to the second chamber and configured to control the gas enclosed in the second chamber such that a gas load in the first chamber is reduced.
    Type: Application
    Filed: November 7, 2006
    Publication date: May 8, 2008
    Inventors: Aniruddha Gadre, Darren Lee Hallman, Paul M. Ratzmann, Richard Michael Roffers, John Scott Price
  • Publication number: 20080101539
    Abstract: A bearing assembly mounted in an x-ray tube includes a bearing race and a bearing ball positioned adjacent to the bearing race. A coating is deposited on one of the bearing race and the bearing ball includes a lubricant and a hard material having a hardness greater than a base material of the bearing race and a base material of the bearing ball.
    Type: Application
    Filed: October 23, 2006
    Publication date: May 1, 2008
    Inventors: Krishnamurthy Anand, Dennis Michael Gray, Pazhayannur R. Subramanian, Srinidhi Sampath, Carey Shawn Rogers, Steven Alfred Tysoe, Richard Arthur Nardi
  • Publication number: 20080101540
    Abstract: A bearing assembly mounted in an x-ray tube includes a bearing race and a bearing ball positioned adjacent to the bearing race. A lubricant is deposited on a first portion of a bare metal of one of the bearing race and the bearing ball, and a metal matrix deposited on a second portion of the bare metal.
    Type: Application
    Filed: October 23, 2006
    Publication date: May 1, 2008
    Inventors: Krishnamurthy Anand, Dennis Michael Gray, Pazhayannur R. Subramanian, Srinidhi Sampath, Carey Shawn Rogers, Steven Alfred Tysoe, Richard Arthur Nardi
  • Patent number: 7245700
    Abstract: A system and method for providing a sealing arrangement in an X-ray tube are provided. The X-ray tube includes a rotating portion having a plurality of ball bearings and a liquid metal within a housing having the ball bearings therein. The rotating portion is configured to rotate an anode. The X-ray tube further includes a sealing portion formed by a liquid metal vacuum interface configured in a radial direction to resist flow of liquid metal from the housing to a vacuum portion.
    Type: Grant
    Filed: July 7, 2004
    Date of Patent: July 17, 2007
    Assignee: General Electric Company
    Inventors: Harith Vadari, Ram Turaga, Mayank Tiwari, Hombe Gowda, Mark Ernest Vermilyea, Frédéric Dahan, Thomas Saint Martin
  • Patent number: 7187757
    Abstract: A cooled radiation emission device has an enclosure in which X-rays are produced. In the enclosure, there is a cathode, an anode situated facing the cathode and rotating on a shaft, and a fixed anode shaft support. The support includes a holding chamber, the shaft of the anode being held in the chamber. The cooling of the tube uses a gallium-indium-tin liquid alloy flow through the anode shaft. This alloy is a conductor of heat and electricity. At the same time as the lubrication of the bearings and the electrical powering of the anode, it provides for cooling of the anode.
    Type: Grant
    Filed: December 5, 2005
    Date of Patent: March 6, 2007
    Assignee: General Electric Company
    Inventors: Thomas Saint-Martin, Jean-Christophe Claisse, Frédéric Dahan, Gwénaël Lemarchand
  • Patent number: 7127035
    Abstract: An anode target is roratably supported by a rotating mechanism having a rotary body and a staionary body. A fitted portion between the rotary body and the stationary body is formed of bearing areas having dynamic pressure type sliding bearings and a non-bearing area having a clearance between the rotary body and the stationary body larger than that in the bearing areas. The rotary body facing the non-bearing area is positioned where a time for heat transfer from the anode target is shorter than the rotary body facing the bearing areas. Thus, the characteristics of heat radiation from the anode target can be improved, and a stable bearing operation can be maintained.
    Type: Grant
    Filed: August 29, 2002
    Date of Patent: October 24, 2006
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Hidero Anno, Shin Saito
  • Patent number: 7113568
    Abstract: A rotating anode bearing housing includes an x-ray tube frame (106) that has a vacuum chamber (108). An anode (110) resides within the vacuum chamber (108) and rotates on a shaft (114) via a bearing (117). The bearing (117) is attached to an interior surface (126) of the x-ray tube frame (106). The bearing (117) transfers thermal energy from the shaft (114) to the x-ray tube frame (106).
    Type: Grant
    Filed: January 18, 2005
    Date of Patent: September 26, 2006
    Assignee: General Electric Company
    Inventors: Harith Vadari, Mandyam Rangayan Sridhar, Mayank Tiwari
  • Patent number: 6891928
    Abstract: Liquid metal gaskets for use in vacuum tubes are provided. Such liquid metal gaskets are ideal for use in x-ray tubes in x-ray imaging systems. These liquid metal gaskets comprise an internal plug incorporating a liquid metal filling, a first seal connected to a first end of the internal plug so as to isolate a bearing assembly from a vacuum vessel portion of the vacuum tube, and a second seal connected to a second end of the internal plug so as to prevent particles and vapors in a cavity of the bearing assembly from migrating into a vacuum area of the x-ray tube. The liquid metal gaskets incorporate any suitable liquid metal, such as mercury, gallium, or a gallium alloy. The liquid metal gaskets allow any suitable type of bearing assembly lubricant to be used, such as oils, powders, liquids, solids, wetting metals, and the like.
    Type: Grant
    Filed: May 7, 2003
    Date of Patent: May 10, 2005
    Assignees: Global Technology Company, LLC
    Inventors: Thomas Saint Martin, Frédéric Dahan
  • Publication number: 20040234033
    Abstract: An anode target (22) is rotatably supported by a rotating mechanism (25) having a rotary body (23) and a stationary body (28). A fitted portion between the rotary body (23) and the stationary body (28) is formed of bearing areas (L1) to (L4) having dynamic pressure type sliding bearings and a non-bearing area (L5) having a clearance between the rotary body (23) and the stationary body (28) larger than that in the bearing areas (L1) to (L4). The rotary body facing the non-bearing area is positioned where a time for heat transfer from the anode target (22) is shorter than the rotary body facing the bearing areas. Thus, the characteristics of heat radiation from the anode target (22) can be improved, and a stable bearing operation can be maintained.
    Type: Application
    Filed: February 26, 2004
    Publication date: November 25, 2004
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Hidero Anno, Shin Saito
  • Patent number: 6751291
    Abstract: Disclosed is a rotary anode type X-ray tube comprising an anode target emitting an X-ray, a rotating mechanism for rotatably supporting the anode target, the rotating mechanism including an inside rotor and a stator, bearings being arranged between the inside rotor and the stator, and a vacuum envelope housing the anode target and the rotating mechanism. Dynamic slide bearings each using a liquid metal lubricant and ball bearings are used as the bearings arranged between the inside rotor and the stator.
    Type: Grant
    Filed: February 22, 2002
    Date of Patent: June 15, 2004
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Hironori Nakamuta, Mitsuo Iwase
  • Patent number: 6693990
    Abstract: A bearing assembly for a rotating anode x-ray device. The bearing assembly includes a shaft having a flange at one end for attachment of the anode thereto. The shaft defines front and rear inner races and includes a plurality of extended surfaces. Front and rear outer race elements define front and rear outer races, respectively, corresponding to the front and rear inner races, respectively, defined by the shaft. The front and rear outer race elements cooperate with the shaft to confine front and rear ball sets which facilitate rotary motion of the shaft. A spacer including extended surfaces assists in the positioning of the front and rear outer race elements in a bearing housing. The extended surfaces of the shaft and spacer, in conjunction with emissive coatings provided on various portions of selected components of the bearing assembly, facilitate a relative improvement in heat transfer out of the bearing assembly.
    Type: Grant
    Filed: May 14, 2001
    Date of Patent: February 17, 2004
    Assignee: Varian Medical Systems Technologies, Inc.
    Inventor: Gregory C. Andrews
  • Patent number: 6636583
    Abstract: An x-ray tube 10 is provided including an anode mounted to a rotatable shaft positioned within a center bore of a stem element, a bearing assembly positioned between the rotatable shaft and the stem element, and at least one liquid metal shunt in thermal communication with both the rotatable shaft and the stem element, located adjacent to the anode between the anode and the bearing assembly, and directing heat generated at the anode away from the bearing assembly by allowing heat to flow from the rotatable shaft into the stem element prior to heat reaching the bearing assembly.
    Type: Grant
    Filed: March 4, 2002
    Date of Patent: October 21, 2003
    Assignee: GE Medical Systems Global Technology Co., LLC
    Inventors: Paul Michael Ratzmann, Suryaprakash Ganti, Mark Ernest Vermilyea, James Edward Simpson
  • Publication number: 20030165217
    Abstract: An x-ray tube 10 is provided including an anode mounted to a rotatable shaft positioned within a center bore of a stem element, a bearing assembly positioned between the rotatable shaft and the stem element, and at least one liquid metal shunt in thermal communication with both the rotatable shaft and the stem element, located adjacent to the anode between the anode and the bearing assembly, and directing heat generated at the anode away from the bearing assembly by allowing heat to flow from the rotatable shaft into the stem element prior to heat reaching the bearing assembly.
    Type: Application
    Filed: March 4, 2002
    Publication date: September 4, 2003
    Inventors: Paul Michael Ratzmann, Suryaprakash Ganti, Mark Ernest Vermilyea, James Edward Simpson
  • Patent number: 6546078
    Abstract: An X-ray tube includes a substantially cylindrical rotor having an anode target fixed thereto, a substantially columnar stationary shaft coaxially arranged inside the rotor with a bearing gap, a dynamic slide bearing having helical grooves and formed between the rotor and the stationary shaft, and a metal lubricant supplied to the grooves and to the gap. An axial bore is formed in the shaft to extend in the longitudinal direction of the shaft, and an insertion rod is inserted into the axial bore such that a space extending in the longitudinal direction of the shaft is formed between an inner circumferential surface of the axial bore and an outer circumferential surface of the insertion rod. The space acts as at least one lubricant reservoir that is configured to store the metal lubricant.
    Type: Grant
    Filed: March 9, 2001
    Date of Patent: April 8, 2003
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Hideki Ide
  • Publication number: 20020150212
    Abstract: A multiple row spiral grooved bearing assembly 26 for use in a rotating anode X ray tube device 10 has an intermediate race 32 having a spiral grooved inner 34 and outer 36 surface placed between an outer housing 28 and an inner bearing shaft 30. A layer of gallium 42, 44 is interposed between the spiral grooved inner surface 34 and the inner bearing shaft 30 and between the spiral grooved outer surface 36 and outer housing 28 to provide lubrication for the surfaces of the intermediate race 32. The intermediate race 32 reduces the relative velocity between moving parts, thereby reducing heat generation of the bearing assembly 26 for a given anode rotation speed. This enables higher target 14 velocities, and hence higher focal spot power, available to the x-ray tube device 10 as compared with traditional ball-type bearing designs.
    Type: Application
    Filed: April 12, 2001
    Publication date: October 17, 2002
    Inventors: Paul M. Ratzmann, Douglas J. Snyder