EP2781684A1 - Roller cutter with improved sealing - Google Patents

Roller cutter with improved sealing Download PDF

Info

Publication number
EP2781684A1
EP2781684A1 EP13160149.4A EP13160149A EP2781684A1 EP 2781684 A1 EP2781684 A1 EP 2781684A1 EP 13160149 A EP13160149 A EP 13160149A EP 2781684 A1 EP2781684 A1 EP 2781684A1
Authority
EP
European Patent Office
Prior art keywords
roller cutter
hub
seal retainer
cutter according
recess
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP13160149.4A
Other languages
German (de)
French (fr)
Inventor
Joona Loikkanen
Stig-Åke BROLUND
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sandvik Intellectual Property AB
Original Assignee
Sandvik Intellectual Property AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=47913147&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP2781684(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Sandvik Intellectual Property AB filed Critical Sandvik Intellectual Property AB
Priority to EP13160149.4A priority Critical patent/EP2781684A1/en
Priority to BR112015022729A priority patent/BR112015022729A2/en
Priority to CN201480016275.2A priority patent/CN105121773A/en
Priority to AU2014234545A priority patent/AU2014234545A1/en
Priority to PE2015002038A priority patent/PE20151581A1/en
Priority to PCT/EP2014/054472 priority patent/WO2014146913A1/en
Priority to MX2015013311A priority patent/MX2015013311A/en
Priority to RU2015144868A priority patent/RU2015144868A/en
Priority to CA2903301A priority patent/CA2903301A1/en
Priority to US14/778,630 priority patent/US20160040482A1/en
Publication of EP2781684A1 publication Critical patent/EP2781684A1/en
Priority to CL2015002775A priority patent/CL2015002775A1/en
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits
    • E21B10/08—Roller bits
    • E21B10/22—Roller bits characterised by bearing, lubrication or sealing details
    • E21B10/25—Roller bits characterised by bearing, lubrication or sealing details characterised by sealing details
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits
    • E21B10/08—Roller bits
    • E21B10/10—Roller bits with roller axle supported at both ends

Definitions

  • the present invention relates to a roller cutter for a drill head for rotary boring of a front of earth and rock formations according to the preamble of the independent claim.
  • a roller cutter comprising an improved sealing is addressed in U.S. Pat. No. 5,984,024 . It shows sealing means held in position by a seal retainer.
  • the roller cutter also comprises relief holes having conical plugs which are removed in order to refill the roller cutter with lubricant, such as grease or oil.
  • lubricant such as grease or oil.
  • One object of the present invention is to provide a roller cutter with improved sealing compared to existing roller cutters.
  • a roller cutter having a centre line comprising: a hub provided with rows of crushing members, at least one crushing member having its longitudinal axis at an angle relative to a normal to the centre line, said hub being rotatable in relation to a shaft having shaft spigots, the roller cutter being provided with at least one seal retainer arranged at an axial end of the hub in order to hold sealing means in position, wherein the hub comprises at least one circumferential recess positioned axially inward relative to a radially inward projecting flange in the hub.
  • FIG. 1 illustrates how a pilot hole 11, which in a known way is pre-drilled between an upper and a lower, not shown, level in a mine is reamed by means of a drill head designated 10.
  • the drill head 10 is connected to a drive stem 12 by means of which the drill head is rotated and is pressed against a ring-shaped surface 13 that surrounds the pilot hole 11.
  • the surface 13, thus, defines the face of the earth formation.
  • the invention relates to earth boring in general, but is primarily intended for raise boring. At raise boring, a distance is drilled between the lower and the upper level in a mine, and then the pilot hole is reamed by means of a drill head having a large diameter.
  • the drill head 10 comprises a body 16 and a plurality of rollers or cutters 14, which are rotatably mounted on the body in fasteners or saddles 15. Each roller cutter comprises circumferential rows of buttons or crushing members of cemented carbide in a known way.
  • the saddles 15 are mounted on the body 16.
  • the drive stem 12 is connected to the body 16.
  • the body 16 has a mounting surface 17 on which the saddles 15 are carried.
  • FIG. 2 illustrates how the saddle 15 comprises a bottom surface 18, which is intended to be connected, for instance by screwing or welding, to the mounting surface 17. Furthermore, the saddle 15 comprises two legs 19, 20, between which the roller cutter is mounted. The legs 19, 20 are, at the ends thereof facing away from the bottom surface 18 formed with arms 21. The arms 21 have different lengths from the bottom surface 18. Fastening devices in the form of threaded bolts 22 and nuts 23 are intended to hold the roller cutter 14 and the saddle 15 together.
  • FIG. 3A illustrates the roller cutter having a shaft 33 with a longitudinal centre line CL.
  • Axially outward refers to a direction towards the arms 21, and radially outward means a direction away from the centre line.
  • the ends of the shaft 33 each has a shaft spigot 34, 35, which is intended to abut against a support surface (not shown) in the arms 21 of the saddle 15.
  • a hub 24 is rotatably mounted on the shaft 33 via bearing members 26.
  • the bearing members 26 are received in circumferential grooves in the hub 24.
  • the hub 24 is locked axially in relation to the shaft 33 by means of a lock member 28, preferably in the form of balls, which co-operate with circumferential grooves in both the shaft 33 and the hub 24.
  • the roller cutter 14 has inserts or crushing members 29 mounted in rows at an envelope surface of the hub 24. At least one of the crushing members 29 has its longitudinal centre line CL1 at an angle relative to a normal to the centre line CL of the roller cutter 14.
  • FIG. 3B illustrates that between the axial ends of the hub 24 and the shaft 33 the cutter 14 is at at least one end, preferably both, provided with seal retainers 38.
  • the seal retainer 38 has a maximum axial extension X.
  • the seal retainer 38 supports sealing means 37 that prevents the lubricant, such as grease or oil, from leaking out from the interior of the cutter 14.
  • the sealing means 37 is of the type mechanical face seal, also called duo-cone seal. It comprises two O-rings 37A and 37B, made of a resilient material, and two seal rings 37C and 37D, often made of cast iron. The most radially outward surfaces of the seal rings, 37C and 37D, have a concave shape in order to axially fix the O-rings, 37A and 37B, in position.
  • the seal retainers 38 are equipped with relief holes 39 having plugs 40 mounted in said holes to prevent lubricant from leaking out through said holes 39.
  • the plugs 40 may be conical and are removed when the roller cutter 14 needs refilling of lubricant. With this method air escapes the interior of the roller cutter 14, thus making the refilling of lubricant easier.
  • the seal retainer 38 has a radially outward projecting part 41 at its axially and radially most outward part. Adjacent to, and radially outward from the projecting part 41 is a circumferential indent 42 in the hub 24.
  • the indent 42 and the projecting part 41 form a labyrinth which further decreases the risk of dirt reaching the interior of the roller cutter 14.
  • the projecting part 41 is in the form of a ring attached to the seal retainer 38.
  • This ring 41 can be metallurgically bonded to the seal retainer 38, preferably by welding.
  • the flange 43 has substantially parallel side surfaces and an end surface substantially parallel to the centre line CL. Further axially inward from the flange 43, there is a circumferential recess 44 in the hub 24 in order to hold an O-ring 45 in position.
  • One side surface of the flange 43 constitutes a boundary of the recess 44.
  • the flange 43 and the recess 44 are positioned radially outward from the seal retainer 38 and are axially entirely contained within the seal retainer's 38 axial extension X.
  • a snap ring 47 is used in conjunction with a lock ring (not shown) to lock the seal retainer 38 in position on the shaft 33.
  • Another O-ring 48 made of a resilient material, prevents leakage between seal retainer 38 and shaft 33.
  • a dowel pin 49 fixes the seal retainer 38 statically in position thus hindering it from rotational movement.
  • the O-rings, 37A, 37B, 45 and 48 are all made of a resilient material. Examples of such materials are silicone, Viton and nitrile rubber. The material chosen depends on the load and temperature the O-ring is supposed to be exposed to.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)
  • Sealing Devices (AREA)

Abstract

A roller cutter (14) intended to be used at a drill head for rotary boring of the front of earth and rock formations, said roller cutter having a centre line (CL) and being provided with a hub (24) provided with rows of crushing members (29), at least one crushing member having its longitudinal axis at an angle relative to a normal to the centre line (CL), said hub being rotatable in relation to a shaft (33) having shaft spigots (34, 35), the roller cutter being provided with at least one seal retainer (38) arranged at an axial end of the hub in order to hold sealing means (37) in position, wherein the hub comprises at least one circumferential recess (44) positioned axially inward relative to a radially inward projecting flange (43) in the hub.

Description

    Technical Field and Background
  • The present invention relates to a roller cutter for a drill head for rotary boring of a front of earth and rock formations according to the preamble of the independent claim.
  • A roller cutter comprising an improved sealing is addressed in U.S. Pat. No. 5,984,024 . It shows sealing means held in position by a seal retainer. The roller cutter also comprises relief holes having conical plugs which are removed in order to refill the roller cutter with lubricant, such as grease or oil. However, with this solution dirt frequently reaches the sealing means and knocks the O-rings of the seal out of position, thus decreasing its sealing efficiency.
  • Another roller cutter with improved sealing is addressed in U.S. Pat. No. 7,278,500 . It shows sealing means protected by a cover in order to prevent dirt from reaching the interior of the roller cutter. However, with this solution it is problematic to refill the roller cutter with lubricant.
    • Summary
  • One object of the present invention is to provide a roller cutter with improved sealing compared to existing roller cutters.
  • According to a one aspect, there is provided a roller cutter, having a centre line comprising: a hub provided with rows of crushing members, at least one crushing member having its longitudinal axis at an angle relative to a normal to the centre line, said hub being rotatable in relation to a shaft having shaft spigots, the roller cutter being provided with at least one seal retainer arranged at an axial end of the hub in order to hold sealing means in position, wherein the hub comprises at least one circumferential recess positioned axially inward relative to a radially inward projecting flange in the hub.
    • Brief Description of the Drawings
  • In the detailed description of the present invention reference will be made to the accompanying drawings, wherein,
    • Fig. 1 schematically shows an axial cross-section through a raise-boring head having roller cutters according to the invention.
    • Fig. 2 schematically shows a roller cutter according to the present invention as well as a saddle in side view.
    • Fig. 3A schematically shows the roller cutter according to the present invention in a partial cross-section.
    • Fig. 3B schematically shows an enlarged section according to Fig. 3A.
    Detailed Description
  • The features and advantages of the present invention are well understood by reading the following detailed description in conjunction with the drawings in which like numerals indicate similar elements and in which:
  • FIG. 1 illustrates how a pilot hole 11, which in a known way is pre-drilled between an upper and a lower, not shown, level in a mine is reamed by means of a drill head designated 10. The drill head 10 is connected to a drive stem 12 by means of which the drill head is rotated and is pressed against a ring-shaped surface 13 that surrounds the pilot hole 11. The surface 13, thus, defines the face of the earth formation.
  • The invention relates to earth boring in general, but is primarily intended for raise boring. At raise boring, a distance is drilled between the lower and the upper level in a mine, and then the pilot hole is reamed by means of a drill head having a large diameter.
  • The drill head 10 comprises a body 16 and a plurality of rollers or cutters 14, which are rotatably mounted on the body in fasteners or saddles 15. Each roller cutter comprises circumferential rows of buttons or crushing members of cemented carbide in a known way. The saddles 15 are mounted on the body 16. The drive stem 12 is connected to the body 16. The body 16 has a mounting surface 17 on which the saddles 15 are carried.
  • FIG. 2 illustrates how the saddle 15 comprises a bottom surface 18, which is intended to be connected, for instance by screwing or welding, to the mounting surface 17. Furthermore, the saddle 15 comprises two legs 19, 20, between which the roller cutter is mounted. The legs 19, 20 are, at the ends thereof facing away from the bottom surface 18 formed with arms 21. The arms 21 have different lengths from the bottom surface 18. Fastening devices in the form of threaded bolts 22 and nuts 23 are intended to hold the roller cutter 14 and the saddle 15 together.
  • FIG. 3A illustrates the roller cutter having a shaft 33 with a longitudinal centre line CL. Directions in the following description refer to this centre line. Axially outward refers to a direction towards the arms 21, and radially outward means a direction away from the centre line. The ends of the shaft 33 each has a shaft spigot 34, 35, which is intended to abut against a support surface (not shown) in the arms 21 of the saddle 15.
  • A hub 24 is rotatably mounted on the shaft 33 via bearing members 26. The bearing members 26 are received in circumferential grooves in the hub 24. The hub 24 is locked axially in relation to the shaft 33 by means of a lock member 28, preferably in the form of balls, which co-operate with circumferential grooves in both the shaft 33 and the hub 24.
  • The roller cutter 14 has inserts or crushing members 29 mounted in rows at an envelope surface of the hub 24. At least one of the crushing members 29 has its longitudinal centre line CL1 at an angle relative to a normal to the centre line CL of the roller cutter 14.
  • FIG. 3B illustrates that between the axial ends of the hub 24 and the shaft 33 the cutter 14 is at at least one end, preferably both, provided with seal retainers 38. The seal retainer 38 has a maximum axial extension X. The seal retainer 38 supports sealing means 37 that prevents the lubricant, such as grease or oil, from leaking out from the interior of the cutter 14. In one embodiment the sealing means 37 is of the type mechanical face seal, also called duo-cone seal. It comprises two O- rings 37A and 37B, made of a resilient material, and two seal rings 37C and 37D, often made of cast iron. The most radially outward surfaces of the seal rings, 37C and 37D, have a concave shape in order to axially fix the O-rings, 37A and 37B, in position.
  • The seal retainers 38 are equipped with relief holes 39 having plugs 40 mounted in said holes to prevent lubricant from leaking out through said holes 39. The plugs 40 may be conical and are removed when the roller cutter 14 needs refilling of lubricant. With this method air escapes the interior of the roller cutter 14, thus making the refilling of lubricant easier.
  • The seal retainer 38 has a radially outward projecting part 41 at its axially and radially most outward part. Adjacent to, and radially outward from the projecting part 41 is a circumferential indent 42 in the hub 24. The indent 42 and the projecting part 41 form a labyrinth which further decreases the risk of dirt reaching the interior of the roller cutter 14. There may be a radial space, of about 1.4 to 2 mm, between the hub 24 and the seal retainer 38 in order to separate the hub 24 from the seal retainer 38 even at loads of up to 30 metric tonnes. For the same reason, there may be a radial and axial space, of about 1.4 to 2 mm, between the hub 24 and the projecting part 41.
  • In one embodiment, the projecting part 41 is in the form of a ring attached to the seal retainer 38. This ring 41 can be metallurgically bonded to the seal retainer 38, preferably by welding.
  • Axially inward from the indent 42, there is a radially inward projecting flange 43 in the hub 24. The flange 43 has substantially parallel side surfaces and an end surface substantially parallel to the centre line CL. Further axially inward from the flange 43, there is a circumferential recess 44 in the hub 24 in order to hold an O-ring 45 in position. One side surface of the flange 43 constitutes a boundary of the recess 44. The flange 43 and the recess 44 are positioned radially outward from the seal retainer 38 and are axially entirely contained within the seal retainer's 38 axial extension X.
  • There is a groove 46 at the axially outermost end of the seal retainer 38, in order to facilitate attachment of the ring 41.
  • A snap ring 47 is used in conjunction with a lock ring (not shown) to lock the seal retainer 38 in position on the shaft 33.
  • Another O-ring 48, made of a resilient material, prevents leakage between seal retainer 38 and shaft 33.
  • If dirt enters the area between hub 24 and seal retainer 38 then a force will be transmitted through the dirt to the seal retainer 38 which may lead to the seal retainer 38 starting to rotate. A dowel pin 49 fixes the seal retainer 38 statically in position thus hindering it from rotational movement.
  • The O-rings, 37A, 37B, 45 and 48, are all made of a resilient material. Examples of such materials are silicone, Viton and nitrile rubber. The material chosen depends on the load and temperature the O-ring is supposed to be exposed to.
  • The present invention is not limited to the above described embodiments. Different alternatives, modifications and equivalents might be used. The above mentioned embodiments should therefore, not be considered limiting to the scope of the invention, which is defined by the patent claims.

Claims (9)

  1. A roller cutter (14) intended to be used at a drill head for rotary boring of the front of earth and rock formations, said roller cutter having a centre line (CL) and being provided with a hub (24) provided with rows of crushing members (29), at least one crushing member having its longitudinal axis at an angle relative to a normal to the centre line (CL), said hub being rotatable in relation to a shaft (33) having shaft spigots (34, 35), the roller cutter being provided with at least one seal retainer (38) arranged at an axial end of the hub in order to hold sealing means (37) in position, characterized in that the hub comprises at least one circumferential recess (44) positioned axially inward relative to a radially inward projecting flange (43) in the hub.
  2. The roller cutter according to claim 1, characterized in that one side surface of the flange constitutes a boundary of the recess.
  3. The roller cutter according to claim 1 or 2, characterized in that the seal retainer has a maximum axial extension (X) and the flange and the recess are positioned radially outward from said seal retainer and are axially entirely contained within said axial extension.
  4. The roller cutter according to claim 1, 2 or 3, characterized in that the recess holds an O-ring (45) in position.
  5. The roller cutter according to any of the preceding claims, characterized in that at least one seal retainer comprises a radially outward directed projecting part (41) at a position forming a seal retainer's axial and radial outermost end.
  6. The roller cutter according to claim 5, characterized in that the projecting part is a ring.
  7. The roller cutter according to claim 6, characterized in that the ring is metallurgically bonded to the seal retainer.
  8. The roller cutter according to any of the preceding claims, characterized in that the hub comprises at least one circumferential indent (42) radially outward from and adjacent to the projecting part on the seal retainer.
  9. The roller cutter according to any of the preceding claims, characterized in that at least one seal retainer has a groove (46) at its axially outermost end.
EP13160149.4A 2013-03-20 2013-03-20 Roller cutter with improved sealing Withdrawn EP2781684A1 (en)

Priority Applications (11)

Application Number Priority Date Filing Date Title
EP13160149.4A EP2781684A1 (en) 2013-03-20 2013-03-20 Roller cutter with improved sealing
US14/778,630 US20160040482A1 (en) 2013-03-20 2014-03-07 Roller cutter with improved sealing
PE2015002038A PE20151581A1 (en) 2013-03-20 2014-03-07 ROLL CUTTER WITH IMPROVED SEALING
CN201480016275.2A CN105121773A (en) 2013-03-20 2014-03-07 Roller cutter with improved sealing
AU2014234545A AU2014234545A1 (en) 2013-03-20 2014-03-07 Roller cutter with improved sealing
BR112015022729A BR112015022729A2 (en) 2013-03-20 2014-03-07 Improved sealing roller cutter.
PCT/EP2014/054472 WO2014146913A1 (en) 2013-03-20 2014-03-07 Roller cutter with improved sealing
MX2015013311A MX2015013311A (en) 2013-03-20 2014-03-07 Roller cutter with improved sealing.
RU2015144868A RU2015144868A (en) 2013-03-20 2014-03-07 BALL WITH IMPROVED SEAL
CA2903301A CA2903301A1 (en) 2013-03-20 2014-03-07 Roller cutter with improved sealing
CL2015002775A CL2015002775A1 (en) 2013-03-20 2015-09-16 Roller cutter with improved sealing

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP13160149.4A EP2781684A1 (en) 2013-03-20 2013-03-20 Roller cutter with improved sealing

Publications (1)

Publication Number Publication Date
EP2781684A1 true EP2781684A1 (en) 2014-09-24

Family

ID=47913147

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13160149.4A Withdrawn EP2781684A1 (en) 2013-03-20 2013-03-20 Roller cutter with improved sealing

Country Status (11)

Country Link
US (1) US20160040482A1 (en)
EP (1) EP2781684A1 (en)
CN (1) CN105121773A (en)
AU (1) AU2014234545A1 (en)
BR (1) BR112015022729A2 (en)
CA (1) CA2903301A1 (en)
CL (1) CL2015002775A1 (en)
MX (1) MX2015013311A (en)
PE (1) PE20151581A1 (en)
RU (1) RU2015144868A (en)
WO (1) WO2014146913A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3868997A1 (en) 2020-02-21 2021-08-25 Sandvik Mining and Construction Tools AB Roller cutting tool with improved sealing

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE112012003844T5 (en) * 2011-09-16 2014-07-10 Vermeer Manufacturing Company Widening head bearing arrangement
WO2016116910A1 (en) 2015-01-23 2016-07-28 Master Drilling South Africa (Pty) Ltd Shaft enlargement arrangement for a boring system
US10947845B2 (en) * 2016-09-21 2021-03-16 Master Sinkers (Pty) Ltd Shaft enlargement arrangement for a boring system
US11585158B2 (en) 2020-05-21 2023-02-21 Caterpillar Inc. Isolated lubrication system for drill bits

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3449024A (en) * 1965-03-08 1969-06-10 Dresser Ind Seal arrangement between relatively rotatable members
US3572452A (en) * 1969-04-16 1971-03-30 Dougles F Winberg Rolling cutter and seals therefor
US5984024A (en) 1995-06-22 1999-11-16 Sandvik Ab Cutter, a stopper means and a method of preventing mud from entering into a cutter
US7278500B2 (en) 2003-01-30 2007-10-09 Sandvik Intellectual Property Ab Roller cutter

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE508468C2 (en) * 1996-10-08 1998-10-12 Sandvik Ab Rock drill bit for rotating, crushing machining of rock and sealing means for such rock drill bit
CN200982159Y (en) * 2006-09-29 2007-11-28 天津立林钻头有限公司 Roller bit single-metal floating seal assembly
CN102661123A (en) * 2012-05-03 2012-09-12 西南石油大学 High-temperature resistant floating sealing device for cone bit

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3449024A (en) * 1965-03-08 1969-06-10 Dresser Ind Seal arrangement between relatively rotatable members
US3572452A (en) * 1969-04-16 1971-03-30 Dougles F Winberg Rolling cutter and seals therefor
US5984024A (en) 1995-06-22 1999-11-16 Sandvik Ab Cutter, a stopper means and a method of preventing mud from entering into a cutter
US7278500B2 (en) 2003-01-30 2007-10-09 Sandvik Intellectual Property Ab Roller cutter

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3868997A1 (en) 2020-02-21 2021-08-25 Sandvik Mining and Construction Tools AB Roller cutting tool with improved sealing
WO2021165323A1 (en) 2020-02-21 2021-08-26 Sandvik Mining And Construction Tools Ab Roller cutting tool with improved sealing

Also Published As

Publication number Publication date
US20160040482A1 (en) 2016-02-11
RU2015144868A (en) 2017-04-26
AU2014234545A1 (en) 2015-09-17
CA2903301A1 (en) 2014-09-25
CN105121773A (en) 2015-12-02
WO2014146913A1 (en) 2014-09-25
PE20151581A1 (en) 2015-11-05
CL2015002775A1 (en) 2016-05-27
MX2015013311A (en) 2016-01-25
BR112015022729A2 (en) 2018-05-08

Similar Documents

Publication Publication Date Title
EP2781684A1 (en) Roller cutter with improved sealing
US7387177B2 (en) Bearing insert sleeve for roller cone bit
RU2580674C2 (en) Structured texturing of drill bit sealing surface
WO2009140486A2 (en) Conformal bearing for rock drill bit
RU2667763C1 (en) Gyratory crusher spider bushing assembly
US20160348440A1 (en) Hybrid drill bit
US20140353046A1 (en) Hybrid bit with roller cones near the bit axis
RU2005117052A (en) DRILL BORING CHISEL
US8752655B2 (en) Rock bit having a labyrinth seal/bearing protection structure
RU2562303C2 (en) Wear-resistant material at shirt tail and rotary drilling drill bit front edge
BR102012013611A2 (en) WELL HEAD ASSEMBLY AND METHOD FOR INSTALLING A HOOK IN AN UNDERWATER HEAD HOSTING ASSEMBLY
CN109072673B (en) Bearing for downhole tool, downhole tool incorporating such bearing, and related methods
AU2012284583A1 (en) Rock bit having a labyrinth seal/bearing protection structure
US20090173546A1 (en) Earth bit with hub and thrust units
US5944126A (en) Resilient, non-rotating seal for rock drill
EP3262268B1 (en) Seal assemblies for earth boring drill bits, drill bits so equipped, and related methods
RU2592911C1 (en) Roller cutter drilling tool
RU2374419C1 (en) Cone bit support (versions)
EP2863004A1 (en) Roller cutter drill bit with mixed bearing types
RU2467148C1 (en) Method of mounting roller drill bit bearing
RU2570724C1 (en) Rolling drilling bit
US9957756B2 (en) Roller cone drill bit assembly with varying radius bearing surfaces
RU2291272C1 (en) Rolling cutter drilling bit support
RU2494217C1 (en) Boring tool
RU2377382C1 (en) Roller cutter drilling tool bearing assembly (versions)

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20130320

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

RBV Designated contracting states (corrected)

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

18W Application withdrawn

Effective date: 20170424