With Bearing Or Seal Details Patents (Class 175/371)
  • Patent number: 7066287
    Abstract: A rolling cone earth boring bit has a diverter located between the bit leg and the back face of the cone to divert debris from the seal gland area. The diverter has a base that inserts into a hole in a last machined surface of the bit. The diverter has a head that is wedge-shaped and protrudes from the hole into a clearance between the back face and the last machined surface. The head has an inner side that is spaced from an annular wall of the back face by a small uniform clearance. The head has an outer side that is oblique to the annular wall of the back face region to divert debris from the clearance.
    Type: Grant
    Filed: February 17, 2004
    Date of Patent: June 27, 2006
    Assignee: Baker Hughes Incorporated
    Inventor: Chih C. Lin
  • Patent number: 7044242
    Abstract: A roller-cone drill bit in which a large groove is machined into the backface of each cone, near the crack where the cone meets the arm assembly. By making the outer lip of this crack more exposed to the open volume of turbulent flow, turbulence near the crack is increased, deposit of sediments near the crack is reduced, and infiltration of sediments through the crack is also reduced.
    Type: Grant
    Filed: April 26, 2002
    Date of Patent: May 16, 2006
    Assignee: Halliburton Energy Services, Inc.
    Inventors: Raul A. Miglierini, Andrew J. Osborne, Jr.
  • Patent number: 7036613
    Abstract: A radial lip seal for use with roller cone drill bits is at least partially collapsed and held in place when the drill bit is subjected to hydrostatic pressure in the well bore when performing drilling operations. The drill bit and seal cooperate to form at least one void intentionally established between the outer surface of a seal recess in the bit and the outer surface of the lip seal. The drill bit has a spindle and a rolling cutter positioned around the spindle. The seal recess is formed in the rolling cutter and has an outer surface to carry the lip seal.
    Type: Grant
    Filed: September 12, 2003
    Date of Patent: May 2, 2006
    Assignee: ReedHycalog, L.P.
    Inventor: Bruce H. Burr
  • Patent number: 7013998
    Abstract: A drill bit (100) for drilling a wellbore that traverses subterranean formations includes a drill bit body (106) having a plurality of journal pins (112), each having a bearing surface (128), and a rotary cutter (104) rotatably mounted on each journal pin (112), each rotary cutter (104) including a bearing surface (126). A pressure-compensated reservoir (130) is in fluid communication with the bearing surfaces (126, 128) and has a lubricant therein. A seal element (144) is positioned between each journal pin (112) and rotary cutter (104) and retains the lubricant in the bearing surfaces (126, 128). The seal element (144) is formed from a nanocomposite material including a polymer host material and a plurality of nanostructures.
    Type: Grant
    Filed: November 20, 2003
    Date of Patent: March 21, 2006
    Assignee: Halliburton Energy Services, Inc.
    Inventors: Thomas Wayne Ray, James Edward Boyce
  • Patent number: 7000712
    Abstract: A seal assembly for a shaft supporting a rotary element comprises a sealing ring having an inner radial surface in contact with a seal surface of the shaft. The sealing ring comprising a disc shaped integral radial lip normal to the inner radial surface. A disc shaped seal shield is assembled in sealing contact with a first surface of the integral disc shaped radial lip and also in sealing contact with a first radial surface of an annular seal groove. An energizer positioned in the annular seal groove is in contact with the bottom surface of the groove and a second radial surface of the groove. The energizer exerts a radial force on the outer radial surface of the sealing ring and a lateral force on the integral radial lip of the sealing ring.
    Type: Grant
    Filed: December 20, 2004
    Date of Patent: February 21, 2006
    Assignee: Varel International Ltd.
    Inventor: Christopher S. Byrd
  • Patent number: 6976548
    Abstract: Self relieving seals of this invention comprise an elastomeric seal body having a first sealing surface and a second sealing surface for contact with respective drill bit sealing surfaces. The seal includes a pair of external surfaces that each extend along the seal body between the first and second sealing surfaces. The seal includes one or more relief ports that are disposed through the seal body and that have openings through each of the seal body external surfaces. The relief port can be specially configured, e.g., have different diameter sections of constant or variable dimensions, to provide a degree of control over pressure equalization through the seal body when the seal is loaded within the drill bit. The seal may include an element, e.g., solid, tubular, or porous, disposed within the relief port to provide a further desired degree of control over pressure equalization through the seal when the seal is loaded within the drill bit.
    Type: Grant
    Filed: April 2, 2003
    Date of Patent: December 20, 2005
    Assignee: Smith International, Inc.
    Inventors: James L. Neville, James L. Larsen, Steven W. Peterson, Manikiran Bandi, Alan Lockstedt, Peter T. Cariveau, Alysia C. White, Anthony Griffo, Michael Siracki
  • Patent number: 6935443
    Abstract: A small sized disk bit includes a bit holder accommodated in a bearing journal on its side (overhangingly), and a disk body with asymmetrically designed wedge flanks mounted rotatably thereon. To enable the disk body to absorb high radial and axial strong forces encountered during the engagement of the disk on a solid rock, the disk body is designed as a one-part disk body with a blind hole with its surface and the bearing journal surface being designed as components of the bearing. The bearing involves the combination of a radial and thrust bearing each, where the thrust bearing is milled into the track of the radial bearing. A ball bearing is used as the axial bearing and a needle roller bearing, a cylindrical roller bearing or a slide bearing is used as the radial bearing. The diameter of the ball bearing is larger than the diameter of the needle rollers, or the cylindrical rollers or the thickness of the sliding bush of the slide bearing.
    Type: Grant
    Filed: November 27, 2002
    Date of Patent: August 30, 2005
    Assignee: Man Takraf Foerdertechnik GmbH
    Inventors: Alexander Ehler, G√ľnter Kunze, Volkmar Schrader
  • Patent number: 6837317
    Abstract: A seal assembly for a shaft supporting a rotary element comprises a sealing ring having an inner radial surface in contact with a seal surface of the shaft. The sealing ring comprising a disc shaped integral radial lip normal to the inner radial surface. A disc shaped seal shield is assembled in sealing contact with a first surface of the integral disc shaped radial lip and also in sealing contact with a first radial surface of an annular seal groove. An energizer positioned in the annular seal groove is in contact with the bottom surface of the groove and a second radial surface of the groove. The energizer exerts a radial force on the outer radial surface of the sealing ring and a lateral force on the integral radial lip of the sealing ring.
    Type: Grant
    Filed: November 13, 2002
    Date of Patent: January 4, 2005
    Assignee: Varel International, Ltd.
    Inventor: Christopher S. Byrd
  • Publication number: 20040238226
    Abstract: An earth-boring bit has a mechanical face seal assembly with PCD faces. The bit has a bearing shaft with a cone rotatably mounted on the bearing shaft. The seal locates between the bearing shaft and the cone for sealing lubricant therein. The seal includes at least one rigid seal ring having a cemented carbide body and an annular PCD face located on it. The mating face may also be of a PCD material. The cemented carbide body contains a binder that migrates into the PCD face while the PCD face is being formed. A binder-free region is leached on the surface of the PCD face.
    Type: Application
    Filed: January 30, 2004
    Publication date: December 2, 2004
    Inventor: Chih C. Lin
  • Patent number: 6820704
    Abstract: Annular seals of this invention comprise an elastomeric seal body that is configured to fit within a seal gland of a rock bit. The seal comprises a first seal surface, for providing a seal along a dynamic rotary surface formed between the seal body and one portion of the rock bit, and a second seal surface, for providing a seal between the seal body and another portion of the rock bit. The annular seal further comprises an extrusion prevention member that is positioned adjacent a surface of the seal body between the first and second seal surfaces. The extrusion prevention member can be integral, partially-attached, or independent of the seal body. The extrusion prevention member is preferably formed from a material having a hardness that is greater than that of the seal body. The member is positioned along the seal body at a location adjacent a groove, formed between opposed members of the rock bit, to act as a physical barrier to prevent the seal from being extruded therethrough.
    Type: Grant
    Filed: August 5, 2002
    Date of Patent: November 23, 2004
    Assignee: Smith International, Inc.
    Inventors: Nephi Mourik, Chris Cawthorne
  • Patent number: 6789634
    Abstract: O-ring seals for rock bit bearings comprise a body formed from an elastomeric material having a lubricant additive in at least the dynamic seal surface to reduce the coefficient of friction and stick-slip amplitude at O-ring seal surfaces. The lubricant additive comprises polarized graphite. O-ring seals made from elastomeric compositions comprise in the range of from about 50 to 99 percent by volume elastomeric material, and in the range of from about 1 to 50 percent by volume of the polarized graphite based on the total volume of the composition. Preferably, the polarized graphite is in the range of from 7 to 25 percent by volume. As the O-ring seal experiences wear from adjacent metal surfaces, flakes of polarized graphite are released from the O-ring seal and adhere to the adjacent metal surfaces and form a lubricating film.
    Type: Grant
    Filed: May 28, 2003
    Date of Patent: September 14, 2004
    Assignee: Smith International, Inc
    Inventor: Robert Denton
  • Patent number: 6769500
    Abstract: A rock bit seal in which the shape of the retainer lip (which restrains the seal from axial motion in response to pressure differentials) is optimized, with respect to the as-deformed shape of the seal in place, to achieve a preload stress which is everywhere nonzero. Preferably the ratio of maximum to minimum stress in the as-installed condition is kept to a small ratio, e.g. less than 2:1.
    Type: Grant
    Filed: September 3, 2002
    Date of Patent: August 3, 2004
    Assignee: Halliburton Energy Services, Inc.
    Inventor: Raul A. Miglierini
  • Patent number: 6752223
    Abstract: In the seal gland in a rotating cone drill bit, the O-ring is initially compressed between the journal and a central portion of the gland which has a cross-section parallel to the journal. These two concentric surfaces provide a minimum amount of contact pressure for a given amount of squeeze than other configurations. Chamfers connect the central portion to the sidewalls of the gland, so that after the seal has worn in use, it will ride up onto the chamfers, where additional squeeze to the seal. This allows the seal to operate in a standard regime during the first part of its lifetime and to automatically shift to a more compressed mode as the seal wears.
    Type: Grant
    Filed: August 28, 2001
    Date of Patent: June 22, 2004
    Assignee: Halliburton Energy Services, Inc.
    Inventors: Amiya K. Panigrahi, Mark P. Blackman, Guy James Lefort
  • Patent number: 6725947
    Abstract: A rotary drill bit includes a bit body that includes a plurality of upright legs that terminate in an exterior bearing surface. At least one roller cutter is affixed to a corresponding exterior bearing surface of one of the plurality of legs. The roller cutter has an exterior cutting surface and a base edge and defines an interior bearing surface that is complementary to a corresponding exterior bearing surface. At least one duct is defined by the lower surface of the lateral wall and is adjacent to at least one exterior bearing surface. A plug is disposed in the duct at a distance from the base edge one of the roller cutters so that if either the interior bearing surface or the exterior bearing surface wears beyond a threshold, the plug will cause a remotely-sensible indication of excessive bearing wear to be asserted.
    Type: Grant
    Filed: August 21, 2001
    Date of Patent: April 27, 2004
    Assignee: Halliburton Energy Services, Inc.
    Inventors: Yuri A. Palaschenko, Raul A. Miglierini
  • Publication number: 20040065481
    Abstract: A rotary mine drilling bit for making blast holes having a connection at one end of the body for attachment to a drill string and the second end of the body having a plurality of longitudinally extending slots. A thrust shoulder is provided between the ends of the body and longitudinally extending supporting legs are positioned in each of the slots and are releasably connected to the body. One end of the supporting legs are positioned the adjacent the shoulders for receiving longitudinal thrust and for avoiding thrust on the connecting means. A roller bit is connected to the end of each supporting leg.
    Type: Application
    Filed: October 4, 2002
    Publication date: April 8, 2004
    Inventor: Henry W. Murdoch
  • Patent number: 6708786
    Abstract: A rotary cutter mount for an earth-boring cutter includes a bearing journal adapted to be coupled to a cutter body. A first mounting end of the bearing journal is shaped to enable rotationally fixed positioning in a corresponding yoke. The yoke is operatively coupled to the body of the cutter. A ball race is formed in an exterior surface of the journal. A ball loading passage is formed in the journal. The ball loading passage has an exit hole on the race. The hole is positioned so that it is disposed in a rotary orientation which is at a selected angular displacement from the maximum radial loading on the journal. The first mounting end and the corresponding yoke are adapted to enable a plurality of rotary orientations. Each of the rotary orientations is such that the hole is oriented other than in the direction of maximum radial loading.
    Type: Grant
    Filed: May 7, 2002
    Date of Patent: March 23, 2004
    Assignee: Smith International, Inc.
    Inventors: Peter T. Cariveau, Vincent W. Shotton
  • Publication number: 20040040747
    Abstract: Self relieving seals of this invention comprise an elastomeric seal body having a first sealing surface and a second sealing surface for contact with respective drill bit sealing surfaces. The seal includes a pair of external surfaces that each extend along the seal body between the first and second sealing surfaces. The seal includes one or more relief ports that are disposed through the seal body and that have openings through each of the seal body external surfaces. The relief port can be specially configured, e.g., have different diameter sections of constant or variable dimensions, to provide a degree of control over pressure equalization through the seal body when the seal is loaded within the drill bit. The seal may include an element, e.g., solid, tubular, or porous, disposed within the relief port to provide a further desired degree of control over pressure equalization through the seal when the seal is loaded within the drill bit.
    Type: Application
    Filed: April 2, 2003
    Publication date: March 4, 2004
    Applicant: Smith International, Inc.
    Inventors: James L. Neville, James L. Larsen, Steven W. Peterson, Manikiran Bandi, Alan Lockstedt, Peter T. Cariveau, Alysia C. White, Anthony Griffo, Michael Siracki
  • Patent number: 6695079
    Abstract: A drill bit for use in a borehole at least partially containing drilling fluid includes a bit body having at least two bit components, including at least one leg, the leg having a journal segment, and a roller cone rotatably mounted upon the journal segment and forming at least one bearing cavity therebetween. Also included is an annular primary seal disposed between the leg and the roller cone, an annular secondary seal disposed between the leg and the roller cone and between the annular primary seal and the borehole and an annular space disposed between the annular primary seal and the annular secondary seal, the annular space at least partially containing fluid and being in substantially absolute fluid isolation from the bearing cavity and a conduit for permitting the flow of fluid from the annular space to the borehole. The annular secondary seal may be primarily elastomeric and the means for permitting the flow of fluid may further permit the flow of fluid from the borehole to the annular space.
    Type: Grant
    Filed: March 18, 2002
    Date of Patent: February 24, 2004
    Assignee: Smith International, Inc.
    Inventors: Gary Ray Portwood, Chris Edward Cawthorne, Robert H. Slaughter, Jr., Roger Didericksen, Peter Cariveau, Robert Denton
  • Publication number: 20040031624
    Abstract: An earth-boring bit has a seal assembly with a seal face having a DLC coating. The seal assembly locates between a bearing pin and a cone of the bit. The seal assembly has at least one rigid ring that rotates against a mating surface. The DLC coating is diamond-like carbon that may be coated by different processes onto either the ring, the mating surface, or both.
    Type: Application
    Filed: August 19, 2002
    Publication date: February 19, 2004
    Inventors: Danny E. Scott, Chih C. Lin, Aaron J. Dick
  • Publication number: 20040031625
    Abstract: An earth-boring bit has a bearing member having a DLC coating. The bearing member locates between a bearing pin and a cone of the bit. The bearing member may be a thrust washer or a bearing sleeve. The DLC coating is diamond-like carbon that may be coated by different processes onto bearing member.
    Type: Application
    Filed: June 23, 2003
    Publication date: February 19, 2004
    Inventors: Chih C. Lin, Aaron J. Dick
  • Patent number: 6679342
    Abstract: A drill bit for use in a borehole at least partially containing drilling fluid includes a bit body having at least two bit components, including at least one leg, the leg having a journal segment, and a roller cone rotatably mounted upon the journal segment and forming at least one bearing cavity therebetween. Also included is an annular primary seal disposed between the leg and the roller cone, an annular secondary seal disposed between the leg and the roller cone and between the annular primary seal and the borehole and an annular space disposed between the annular primary seal and the annular secondary seal, the annular space at least partially containing fluid and being in substantially absolute fluid isolation from the bearing cavity and a conduit for permitting the flow of fluid from the annular space to the borehole. The annular secondary seal may be primarily elastomeric and a passage for permitting the flow of fluid may further permit the flow of fluid from the borehole to the annular space.
    Type: Grant
    Filed: August 7, 2002
    Date of Patent: January 20, 2004
    Assignee: Smith International, Inc.
    Inventors: Gary Ray Portwood, Chris Edward Cawthorne, Robert Denton, Robert H. Slaughter, Jr., Roger Didericksen, Peter Cariveau
  • Publication number: 20040003946
    Abstract: Disclosed are a variety of arcuate-shaped inserts for drill bits, and in particular, for placement in rolling cone cutters of drill bits. The arcuate inserts include 360 degree or ring-shaped inserts, as well as inserts of smaller arcuate length. The arcuate inserts may include stress relieving discontinuities such that, upon assembly into the cone, the arcuate inserts fragment in a controlled and predicted manner into shorter arcuate lengths. The arcuate inserts are suitable for use in all surfaces of the rolling cone cutter, and in other locations in drill bits, and may have specialized cutting surfaces and material enhancements to enhance their cutting duty performance.
    Type: Application
    Filed: July 3, 2002
    Publication date: January 8, 2004
    Inventors: Zhou Yong, James C. Minikus, Amardeep Singh
  • Patent number: 6637528
    Abstract: A bit apparatus in which a cutter member having cutting teeth is axially supported on a shaft for rotation about the shaft, and a bearing mechanism is interposed between the cutter member and the shaft. The bearing mechanism includes at least a radial bearing for bearing a radially directed load and a thrust bearing for bearing an axially directed load. The radial bearing has a shaft-side split bearing member and a cutter-side split bearing member that are opposed to or in sliding contact with each other and capable of rotating relative to each other.
    Type: Grant
    Filed: April 11, 2001
    Date of Patent: October 28, 2003
    Assignee: Japan National Oil Corporation
    Inventors: Akio Nishiyama, Osamu Nakamura, Kazutaka Kanda, Masahiro Arai, Kunio Komaki
  • Patent number: 6598690
    Abstract: The invention is a roller cone drill bit including a seal adapted to seal between the bit body and a roller cone on the drill bit. The seal includes a seal body formed from a material that is adapted to energize the seal after compression of the seal. A first dynamic seal surface formed on the seal body and is adapted to seal against the bit body. A second dynamic seal surface is formed the seal body and is adapted to seal against the roller cone. The first and second dynamic seal surfaces are formed from a material adapted to withstand relative motion between the first dynamic seal surface and the bit body and between the second dynamic seal surface and the roller cone.
    Type: Grant
    Filed: August 3, 2001
    Date of Patent: July 29, 2003
    Assignee: Smith International, Inc.
    Inventor: Steven W. Peterson
  • Publication number: 20030116357
    Abstract: A drill bit has a plurality of air tubes extending into the bowl for separating entrained debris and liquids from air flow used to clean and cool bearings in the cutters of the bit. The air tube is assembled from a tube and a cap. The tube has open ends and a plurality of openings through the sidewall of the tube for allowing air to flow through the openings while preventing large debris from entering the tube. The lower end of the tube is inserted into an inner portion of a fluid passage, and the cap is secured to the upper end of the tube. The cap is removable for providing access to the interior of the tube when necessary to dislodge debris from within the tube.
    Type: Application
    Filed: December 21, 2001
    Publication date: June 26, 2003
    Inventors: Gregory W. Peterson, Samuel B. Davis
  • Patent number: 6578647
    Abstract: A sealing structure for a rock drill bit includes an elastomeric diaphragm for installation in the drill bit so as to separate grease from drilling mud. The diaphragm has an aperture extending through it, and a plug is disposed in the aperture so as to form a mechanical seal with a wall of the aperture. The plug has a channel therethrough which is normally held sealed by a face of the aperture in the diaphragm. If the pressure of the grease exceeds pressure in mud on the other side of the diaphragm by more than a critical value, the diaphragm aperture deforms and allows grease to move through the plug channel and escape. The critical value can be varied by using, with the same diaphragm, plugs having different numbers, sizes and axial positions of plug channels.
    Type: Grant
    Filed: July 25, 2001
    Date of Patent: June 17, 2003
    Assignee: James Walker & Company Limited
    Inventors: Nigel M. Page, Philip D. Embury
  • Patent number: 6571889
    Abstract: A rotary cone bit, having a functionally-engineered surface of this invention, comprises a bit body having at least one leg extending therefrom, and a cone that is rotatably disposed on the leg. The cone typically comprises a plurality of cutting elements that project outwardly therefrom. The cutting elements comprises a cermet material selected from the group consisting of refractory metal carbides, nitrides, borides, carbonitrides and mixtures thereof. A functionally-engineered material is disposed over a surface portion of at least one of the cutting elements to form a wear resistant surface thereon. The wear resistant surface has a hardness that is different than that of the underlying cutting element. The wear resistant surface is provided by forming a conformable material mixture by combining one or more powders selected from the group consisting of cermets, carbides, borides, nitrides, carbonitrides, refractory metals, Co, Fe, Ni, and combinations thereof, with an applying agent.
    Type: Grant
    Filed: May 1, 2001
    Date of Patent: June 3, 2003
    Assignee: Smith International, Inc.
    Inventors: Anthony Griffo, Zhigang Fang, Robert Denton
  • Publication number: 20030098182
    Abstract: A disk bit of a small size includes a bit holder (2), a bearing journal (4) accommodated by the bit holder (2) on the side (overhangingly), and a disk body (5) mounted thereon rotatably with asymmetrically designed wedge flanks (6, 7). High radial and axial forces develop during the engagement of such a disk bit in the solid rock. To enable the disk body (5) to absorb these strong forces, it is designed as a one-part disk body with a blind hole. The surface of the blind hole and the surface of the bearing journal (4) are designed as components of the bearing. The bearing comprises the combination of a radial and thrust bearing each, wherein the thrust bearing is milled into the track of the radial bearing. A ball bearing (9) is used as the axial bearing and a needle roller bearing (10), a cylindrical roller bearing or a slide bearing is used as the radial bearing.
    Type: Application
    Filed: November 27, 2002
    Publication date: May 29, 2003
    Inventors: Alexander Ehler, Gunter Kunze, Volkmar Schrader
  • Publication number: 20030075363
    Abstract: An earth-boring bit has a mechanical face seal assembly with PCD faces. The bit has a bearing shaft with a cone rotatably mounted on the bearing shaft. The seal locates between the bearing shaft and the cone for sealing lubricant therein. The seal includes at least one rigid seal ring having a carbide body and an annular PCD face located on it. The mating face may also be of a PCD material.
    Type: Application
    Filed: October 18, 2001
    Publication date: April 24, 2003
    Inventors: Chih Lin, Terry Koltermann, Danny E. Scott
  • Patent number: 6536542
    Abstract: Seals of this invention comprise an annular elastomeric ring-shaped body having a dynamic surface disposed along a first body portion, the dynamic surface comprising at least two surface elements that project outwardly therefrom to provide multiple barriers to fluid and debris migration thereacross when placed into contact with a rock bit rotary dynamic surface. The seal dynamic surface includes a recessed portion disposed between the surface elements, and a static seal surface disposed along a second body portion. At least one of the surface elements includes a wear surface that is formed from a material that is more wear resistant than materials that are used to form a remaining portion of the seal. A preferred wear surface is one formed from a composite material comprising a fabric of nonelastomeric polymeric material that is bonded together with an elastomeric material.
    Type: Grant
    Filed: October 28, 1999
    Date of Patent: March 25, 2003
    Assignee: Smith International, Inc.
    Inventors: Zhigang Fang, Chris Cawthorne, Nephi M. Mourik, Sujian Huang
  • Patent number: 6533051
    Abstract: A roller cone drill bit includes a bit body adapted to be rotated about a longitudinal axis. At least one leg which terminates in a shirttail portion depends from the bit body. The shirttail portion defines a first end face having a first circumferential groove thereon. The first circumferential groove has a radius equal to the radius of a tip of the shirttail portion. A journal is cantilevered from the leg, and a roller cone is rotatably mounted on the journal. The roller cone has a second end face adjacent to the first end face. A second circumferential groove is formed on the second end face.
    Type: Grant
    Filed: September 7, 1999
    Date of Patent: March 18, 2003
    Assignee: Smith International, Inc.
    Inventors: Amardeep Singh, Dennis Cisneros, Sujian J. Huang, Quan V. Nguyen
  • Publication number: 20030024743
    Abstract: The invention is a roller cone drill bit including a seal adapted to seal between the bit body and a roller cone on the drill bit. The seal includes a seal body formed from a material that is adapted to energize the seal after compression of the seal. A first dynamic seal surface formed on the seal body and is adapted to seal against the bit body. A second dynamic seal surface is formed the seal body and is adapted to seal against the roller cone. The first and second dynamic seal surfaces are formed from a material adapted to withstand relative motion between the first dynamic seal surface and the bit body and between the second dynamic seal surface and the roller cone.
    Type: Application
    Filed: August 3, 2001
    Publication date: February 6, 2003
    Inventor: Steven W. Peterson
  • Patent number: 6513607
    Abstract: A bit is provided having at least one leg extending downwardly and inwardly from the bit body. A cutter cone is rotatably mounted on a shaft extending inwardly from the lower portion of each leg. The annular space defined by the base of the shaft and the inner surface at the base of the cone forms a seal gland. An elastomeric o-ring sealingly engages an inner surface of the cone and a first rigid ring which rotates with the o-ring and cone. The o-ring energizes the first rigid ring for sealingly engaging a second rigid ring mounted to the leg of the bit near the base of the shaft. The second rigid ring is secured to and seals against a surface at the base of the shaft and is held stationary relative to the surface. A lubricant passage for lubricating the seal is pressurized by the drilling fluid pressure in the center of the bit body.
    Type: Grant
    Filed: February 15, 2001
    Date of Patent: February 4, 2003
    Assignee: Baker Hughes Incorporated
    Inventors: Gregory W. Peterson, Howard J. Walk
  • Publication number: 20030019666
    Abstract: A drill bit for use in a borehole at least partially containing drilling fluid includes a bit body having at least two bit components, including at least one leg, the leg having a journal segment, and a roller cone rotatably mounted upon the journal segment and forming at least one bearing cavity therebetween. Also included is an annular primary seal disposed between the leg and the roller cone, an annular secondary seal disposed between the leg and the roller cone and between the annular primary seal and the borehole and an annular space disposed between the annular primary seal and the annular secondary seal, the annular space at least partially containing fluid and being in substantially absolute fluid isolation from the bearing cavity and means for permitting the flow of fluid from the annular space to the borehole. The annular secondary seal may be primarily elastomeric and the means for permitting the flow of fluid may further permit the flow of fluid from the borehole to the annular space.
    Type: Application
    Filed: August 7, 2002
    Publication date: January 30, 2003
    Applicant: Smith International, Inc.
    Inventors: Gary Ray Portwood, Chris Edward Cawthorne, Robert Denton, Robert H. Slaughter, Roger Didericksen, Peter Cariveau
  • Publication number: 20020166702
    Abstract: A rotary cutter mount for an earth-boring cutter includes a bearing journal adapted to be coupled to a cutter body. A first mounting end of the bearing journal is shaped to enable rotationally fixed positioning in a corresponding yoke. The yoke is operatively coupled to the body of the cutter. A ball race is formed in an exterior surface of the journal. A ball loading passage is formed in the journal. The ball loading passage has an exit hole on the race. The hole is positioned so that it is disposed in a rotary orientation which is at a selected angular displacement from the maximum radial loading on the journal. The first mounting end and the corresponding yoke are adapted to enable a plurality of rotary orientations. Each of the rotary orientations is such that the hole is oriented other than in the direction of maximum radial loading.
    Type: Application
    Filed: May 7, 2002
    Publication date: November 14, 2002
    Inventors: Peter T. Cariveau, Vincent W. Shotton
  • Patent number: 6474424
    Abstract: A rotary cone drill bit for forming a borehole having a bit body with an upper portion adapted for connection to a drill string. A number of support arms extending from the bit body with each support arm having an exterior surface with an opening extending therethrough. A number of cutter cone assemblies equal to the number of support arms with each cutter cone assembly rotatably mounted on a respective spindle projecting generally downwardly and inwardly from each support arm. A ball retainer passageway extending from the opening in the exterior surface of each support arm to allow installing ball bearings through the opening and the ball retainer passageway to rotatably mount each cutter cone assembly on its respective spindle. A ball race formed in the exterior of each spindle between a first outside diameter portion and a second outside diameter portion. The ball retainer passageway intersecting the ball race.
    Type: Grant
    Filed: June 3, 1999
    Date of Patent: November 5, 2002
    Assignee: Halliburton Energy Services, Inc.
    Inventor: William C. Saxman
  • Publication number: 20020153172
    Abstract: A drill bit for use in a borehole at least partially containing drilling fluid includes a bit body having at least two bit components, including at least one leg, the leg having a journal segment, and a roller cone rotatably mounted upon the journal segment and forming at least one bearing cavity therebetween. Also included is an annular primary seal disposed between the leg and the roller cone, an annular secondary seal disposed between the leg and the roller cone and between the annular primary seal and the borehole and an annular space disposed between the annular primary seal and the annular secondary seal, the annular space at least partially containing fluid and being in substantially absolute fluid isolation from the bearing cavity and means for permitting the flow of fluid from the annular space to the borehole. The annular secondary seal may be primarily elastomeric and the means for permitting the flow of fluid may further permit the flow of fluid from the borehole to the annular space.
    Type: Application
    Filed: March 18, 2002
    Publication date: October 24, 2002
    Inventors: Gary Ray Portwood, Chris Edward Cawthorne, Robert H. Slaughter, Roger Didericksen, Peter Cariveau, Robert Denton
  • Publication number: 20020108788
    Abstract: A bit is provided having at least one leg extending downwardly and inwardly from the bit body. A cutter cone is rotatably mounted on a shaft extending inwardly from the lower portion of each leg. The annular space defined by the base of the shaft and the inner surface at the base of the cone forms a seal gland. An elastomeric o-ring sealingly engages an inner surface of the cone and a first rigid ring which rotates with the o-ring and cone. The o-ring energizes the first rigid ring for sealingly engaging a second rigid ring mounted to the leg of the bit near the base of the shaft. The second rigid ring is secured to and seals against a surface at the base of the shaft and is held stationary relative to the surface. A lubricant passage for lubricating the seal is pressurized by the drilling fluid pressure in the center of the bit body.
    Type: Application
    Filed: February 15, 2001
    Publication date: August 15, 2002
    Inventors: Gregory W. Peterson, Howard J. Walk
  • Patent number: 6431293
    Abstract: A drill bit for use in a borehole at least partially containing drilling fluid includes a bit body having at least two bit components, including at least one leg, the leg having a journal segment, and a roller cone rotatably mounted upon the journal segment and forming at least one bearing cavity therebetween. Also included is an annular primary seal disposed between the leg and the roller cone and an annular secondary seal disposed between the leg and the roller cone and between the annular primary seal and the borehole. An annular space is defined between the annular primary seal and the annular secondary seal, the annular space at least partially containing fluid and being in substantially absolute fluid isolation from the bearing cavity. The seals are configured to allow the passage of a fluid from the annular space to the borehole. The annular secondary seal may be primarily elastomeric and a passage for fluid from the borehole to the annular space can be included.
    Type: Grant
    Filed: October 13, 2000
    Date of Patent: August 13, 2002
    Assignee: Smith International, Inc.
    Inventors: Gary Ray Portwood, Chris Edward Cawthorne, Robert H. Slaughter, Jr., Roger Didericksen, Peter Cariveau, Robert Denton
  • Patent number: 6427790
    Abstract: A seal arrangement useful in a rolling cutter rock drill bit includes a pair of rigid rings disposed between the leg of the bit body and the rolling cutter. The rings have opposing faces, which have opposing sealing surfaces. The sealing surfaces occupy a portion of the faces and include wear resistant material. A gap is formed between a portion of the faces, the gap allowing lubrication to flow to the sealing surfaces from the bit's bearing cavity.
    Type: Grant
    Filed: November 8, 2001
    Date of Patent: August 6, 2002
    Assignee: Schlumberger Technology Corporation
    Inventor: Bruce H. Burr
  • Patent number: 6408957
    Abstract: A roller cone drill bit is disclosed which includes a bit body having at least one leg depending from the bit body. The leg has a journal formed on it at a lower end. The bit body includes an air channel extending at least from an interior of the bit body to the seal area of the journal. A roller cone is sealingly, rotatably mounted on the journal. The cone has a plurality of cutting elements disposed on it. The bit includes a backflow valve disposed in the bit body, so that an intake end of the air channel is disposed upstream of the backflow valve. In one embodiment, the backflow valve is disposed in a connection end of the bit body, and the air channel includes a flow tube extending from the air passage in the bit body to the backflow valve so that its intake end is upstream of the backflow valve.
    Type: Grant
    Filed: August 23, 2000
    Date of Patent: June 25, 2002
    Assignee: Smith International, Inc.
    Inventors: Robert H. Slaughter, Jr., Fakhroldin M. Jadbabaei, Peter T. Cariveau, Vincent W. Shotton, Roger Didericksen
  • Patent number: 6401843
    Abstract: A drilling head with a cone rock bit, each cone having a stationary part and a rotary part which rotates about an axis of rotation. Also included is a dynamic sealing device between the stationary part and the rotary part. The sealing device is borne by the rotary party and has a first sealing lip and a second sealing lip, each of which forms a surface of revolution about the axis of rotation. Further, the first and second lips bear respectively against a first bearing face and a second bearing face secured to the stationary part. The first lip is oriented in such a way that it presses against the first bearing face under the action of the pressure, and the second lip is oriented in such a way that it moves away from the second bearing face under the action of the pressure of the lubricating product, so as to allow this product to fill a cavity and compensate for the pressure in the cavity.
    Type: Grant
    Filed: March 23, 2000
    Date of Patent: June 11, 2002
    Assignees: Hutchinson, Total
    Inventors: Alain Besson, Patrick Fayaud, Bernard Tissier, Pierre Lecour
  • Patent number: 6390209
    Abstract: A pressure compensating assembly for use in roller cone drilling bits of the sealed bearing type. The compensating assembly includes a hollow body arranged to fit into a cavity in the bit connected with the lubrication system of the bit and the hollow body includes a normally open lubricant passageway extending therethrough. A seal encircles the body on one side of the lubricant passageway and is arranged to sealingly engage the bit and an elastomeric, cup-shaped diaphragm is located on the body and has a lip arranged to sealingly engage the bit on the other side of the lubricant passageway. The diaphragm having a protuberance on the side of the diaphragm facing the passageway and sized to enter and close the passageway. The body, seal, and diaphragm being assembled into a unitary cartridge for introduction into the bit as a unit.
    Type: Grant
    Filed: February 28, 2001
    Date of Patent: May 21, 2002
    Assignee: Dresser Industries, Inc.
    Inventor: William C. Saxman
  • Patent number: 6357540
    Abstract: A roller-cone drill bit in which a double lip seal, made of a self-lubricating elastomer, protects the bearings from the mud.
    Type: Grant
    Filed: June 7, 1999
    Date of Patent: March 19, 2002
    Assignees: Halliburton Energy Services, Inc., James Walker Co., Ltd.
    Inventors: Nigel M. Page, Philip D. Embury
  • Publication number: 20020027326
    Abstract: In the seal gland in a rotating cone drill bit, the O-ring is initially compressed between the journal and a central portion of the gland which has a cross-section parallel to the journal. These two concentric surfaces provide a minimum amount of contact pressure for a given amount of squeeze than other configurations. Chamfers connect the central portion to the sidewalls of the gland, so that after the seal has worn in use, it will ride up onto the chamfers, where additional squeeze to the seal. This allows the seal to operate in a standard regime during the first part of its lifetime and to automatically shift to a more compressed mode as the seal wears.
    Type: Application
    Filed: August 28, 2001
    Publication date: March 7, 2002
    Inventors: Amiya K. Panigrahi, Mark P. Blackman, Guy James Lefort
  • Publication number: 20020023783
    Abstract: A bearing failure indicator for sealed and lubricated rolling cutter earth boring drill bits is disclosed. A plurality of cutting inserts, arranged in a plurality of rows, are secured in the rolling cone cutters. At least two of the rolling cone cutters are intermeshing cutters, arranged such that they have intermeshing rows of cutting inserts. A groove is formed in the intermeshing cutters with a row containing a plurality of generally flat top bearing inserts. In the normal operation of the drill bit, the rows of generally flat top bearing inserts do not contribute to the drilling action of the drill bit. However, when a bearing assembly fails in operation, the generally flat top bearing inserts engage the intermeshing rows of inserts in the adjacent intermeshing cutter causing the drilling torque to increase and thereby providing a signal indicating the bearing has failed.
    Type: Application
    Filed: July 30, 2001
    Publication date: February 28, 2002
    Inventor: Lane P. Skyles
  • Patent number: 6336512
    Abstract: A drill bit having a canted or non-canted leg backface, a canted or non-canted seal in the interface between the cone backface and the shirttail, and a canted seal that can be semi-encapsulated so that there is no straight-line path across the seal.
    Type: Grant
    Filed: February 1, 2000
    Date of Patent: January 8, 2002
    Assignee: Smith International, Inc.
    Inventors: Michael A. Siracki, Steven W. Peterson, Chris E. Cawthorne, Quan V. Nguyen
  • Patent number: 6330923
    Abstract: A sealed bearing for a drill bit including cutting cones and having metal sealing surfaces between the seal cup base and the rotating cone combined with a compressible neoprene or like material having an inner seal lip to seal in the prepacked bearing cavity and an outer seal lip nestled in a recess in the bearing skirt to protect it to keep out foreign matter.
    Type: Grant
    Filed: July 1, 1999
    Date of Patent: December 18, 2001
    Inventor: Roy W. Wood
  • Publication number: 20010050187
    Abstract: A rotary cone rock bit, comprises a bit body including a plurality of legs extending therefrom, each of the legs having an outer surface that includes a leading surface and a trailing surface, a roller cone rotatably supported on each of the legs, a bearing system between each cone and the leg on which it is supported, and a lubricant reservoir in fluid communication with the bearing system. The reservoir can be provided with a wear resistant plug, if desired. In the present bit, the reservoir has at least one opening positioned in either the leg's leading surface, trailing surface, center surface, shoulder surface or some combination of these. Alternatively, the reservoir can be formed inside the bit body, preferably by means of a canister, which can be provided with venting means as desired.
    Type: Application
    Filed: August 17, 2001
    Publication date: December 13, 2001
    Inventors: Robert H. Slaughter, Peter T. Cariveau, Kirk A. Norris, Roger Didericksen, William M. Conn
  • Publication number: 20010042644
    Abstract: Disclosed is a bit apparatus in which a cutter member having cutting teeth is axially supported on a shaft for rotation about the shaft, and a bearing mechanism is interposed between the cutter member and the shaft. The bearing mechanism includes at least a radial bearing for bearing a radially directed load and a thrust bearing for bearing an axially directed load. The radial bearing has a shaft-side split bearing member and a cutter-side split bearing member that are opposed to or in sliding contact with each other and capable of rotating relative to each other.
    Type: Application
    Filed: April 11, 2001
    Publication date: November 22, 2001
    Inventors: Akio Nishiyama, Osamu Nakamura, Kazutaka Kanda, Masahiro Arai, Kunio Komaki