EP0065524A1 - Foret rotatif - Google Patents

Foret rotatif

Info

Publication number
EP0065524A1
EP0065524A1 EP81902720A EP81902720A EP0065524A1 EP 0065524 A1 EP0065524 A1 EP 0065524A1 EP 81902720 A EP81902720 A EP 81902720A EP 81902720 A EP81902720 A EP 81902720A EP 0065524 A1 EP0065524 A1 EP 0065524A1
Authority
EP
European Patent Office
Prior art keywords
bearing
drill bit
rotary drill
roller
sealing means
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Withdrawn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
EP81902720A
Other languages
German (de)
English (en)
Inventor
Lennart Karlsson
Gösta NORLANDER
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.)
SKF AB
Sandvik AB
Original Assignee
SKF AB
Sandvik 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
Application filed by SKF AB, Sandvik AB filed Critical SKF AB
Publication of EP0065524A1 publication Critical patent/EP0065524A1/fr
Withdrawn legal-status Critical Current

Links

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
    • E21B10/22—Roller bits characterised by bearing, lubrication or sealing details
    • E21B10/24—Roller bits characterised by bearing, lubrication or sealing details characterised by lubricating details
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/54—Systems consisting of a plurality of bearings with rolling friction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/164—Sealings between relatively-moving surfaces the sealing action depending on movements; pressure difference, temperature or presence of leaking fluid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/40—Sealings between relatively-moving surfaces by means of fluid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2352/00—Apparatus for drilling

Definitions

  • This invention relates to a rotary drill bit of the type comprising at least one roller cutter, which is r ⁇ tatably carried over a bearing system.
  • the bearing system comprises at least a forward and a rear bearing.
  • Passage means is provided in the bit body for supplying fluid, such as compressed air, to the bearing system for flushing and when needed cooling thereof.
  • the object of the present invention is to provide a rotary drill bit in which there is ensured a satisfactory lubrication and cooling of the forward bearing at the top of the roller cutter, i.e. the end of the roller cutter opposed to the bit body, since the working temperature is higher at this end than at the opposite end.
  • the object of the invention is also to provide a rotary drill bit in which impurities are prevented from entering into the bearing system,while ensuring sufficient cooling and lubrication of the rear bearing at the end of the roller cutter facing the bit body.
  • Fig. 1 shows in section a roller cutter and a bearing pin associated therewith in a rotary drill bit according to the invention.
  • Fig. 2 is a section taken on the line II-II in Fig. 1.
  • Fig. 3 shows a top view of the bearing pin in Fig. 2.
  • Fig. 4 shows on an enlarged scale the encircled portion in
  • Fig. 1 shows a drill bit for rotary drilling in rock and earth formations.
  • the rotary drill bit comprises in conventional manner three separate legs, which form part of the bit body.
  • a rotary drill bit of this type is disclosed in U.S. Patent No. 4.194.794.
  • the lowermost portion of the leg 10 is formed as a bearing pin 11 upon which a roller cutter 12 is rotatably carried.
  • the roller cutter 12 is provided with cutting means 13, in the illustrated embodiment hard metal inserts which are press-fitted in corresponding holes in the roller cutter, so as to break and crush rock and earth formations when the bit is rotated and moved downwards the hole being drilled.
  • the bearing system for the rotatable supporting of the roller cutter 12 comprises a forward roller bearing 14 at the top of the roller cutter, i.e. the end of the roller cutter opposite to the leg 10, a conical axial roller bearing 15 and a rear roller bearing 16.
  • the rollers in the roller bearing 16 are inserted through a loading bore in the leg 10 when the roller cutter 12 is mounted on the bearing pin 11, whereupon a plug 17 is inserted into the bore and secured therein by welding.
  • a seal 18 is provided between the bearing 15 and the bearing 16 for sealing the bearing space of the bearings 14, 15.
  • This bearing space is filled with lubricant, for instance through a passage, not shown, in the bearing pin 11, or by means of a lubricating system, not shown, which in conventional manner comprises a pressure compensator for equalizing the pressures in the lubricant and the fluid in the drill hole.
  • Suitable lubricant is chosen with regard to the high working temperature which arises at the top of the roller cutter.
  • a passage 19 is provided in the leg 10 for supplying fluid, such as compressed air, to the bearing space of the rear roller bearing 16.
  • fluid such as compressed air
  • this fluid is intended on the one hand to cool the bearing 16, and on the other to clean the bearing space thereof and prevent impurities from entering into the bearing space through the annular gap 20 between the roller cutter 12 and the leg 10.
  • the fluid might be warmer than the bearing 16, which means that the primary function of the fluid is to clean the bearing space.
  • the fluid from the passage 19 is conducted through longitudinal grooves 21, 22 in the underneath side of the plug 17 to recesses 23, 24, 25, 26 in the race of the roller bearing 16,
  • the plug 17 forms a portion of the race.
  • the recesses 23, 25 are provided in the plug 17 and turn into the recesses 24, 26 which are provided in the bearing pin 11. Due to the recesses 24, 26 the fluid is distributed over a large circumferential extent, thereby ensuring that the fluid may pass between the rollers in the bearing 16 toward the gap 20.
  • the circumferential extension of the recesses 23-26 is preferably larger than three times the diameter of the rol lers in the bearing 16.
  • the bearing pin 11 is provided with a flange 27, which locks the rollers in the bearing 16 against axial movement.
  • the flange 27 is provided with a bevelled portion 28, which communicates with the recesses 23, 24, 25, 26.
  • annular sealing means 29 having check valve function in the gap 20.
  • the body 30 comprises a rigid body 30 and a resilient lip 31 attached thereto and extending radially outwards. Due to the lip 31 the fluid may flow out through the gap 20 under low flow resistance while large resistance is maintained against penetration of impurities into the bearing system.
  • the body 30 is a rigid body 30 and a resilient lip 31 attached thereto and extending radially outwards. Due to the lip 31 the fluid may flow out through the gap 20 under low flow resistance while large resistance is maintained against penetration of impurities into the bearing system.
  • sealing means 30 of the sealing means is stiffered by means of a metallic plate 32 and attached to the roller cutter 12, for instanceglued thereto.

Landscapes

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

Abstract

Un foret rotatif comprenant au moins une fraise a rouleau (12) montee de maniere rotative est pourvu d'un joint d'etancheite (18), qui separe les espaces de paliers d'un palier anterieur (14) et d'un palier a rouleau posterieur (16). Afin d'assurer un nettoyage efficace de l'espace de palier du palier posterieur (16) un fluide de chasse est fourni a la partie anterieure de la course de celui-ci. Afin de reduire ulterieurement le risque d'une penetration d'impuretes dans le systeme de palier au travers de l'ecartement (20) entre la fraise a rouleau 912) et le corps du foret (10), un joint d'etancheite (29) possedant une fonction de soupape de controle peut etre monte dans l'ecartement (20).
EP81902720A 1980-12-02 1981-09-24 Foret rotatif Withdrawn EP0065524A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8008430A SE8008430L (sv) 1980-12-02 1980-12-02 Bergborrkrona
SE8008430 1980-12-02

Publications (1)

Publication Number Publication Date
EP0065524A1 true EP0065524A1 (fr) 1982-12-01

Family

ID=20342374

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81902720A Withdrawn EP0065524A1 (fr) 1980-12-02 1981-09-24 Foret rotatif

Country Status (6)

Country Link
EP (1) EP0065524A1 (fr)
AU (1) AU7591681A (fr)
BR (1) BR8107552A (fr)
SE (1) SE8008430L (fr)
WO (1) WO1982001909A1 (fr)
ZA (1) ZA816742B (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4516640A (en) * 1983-12-08 1985-05-14 Santrade Ltd. Rotary drill bit
SE516079C2 (sv) * 1998-12-18 2001-11-12 Sandvik Ab Rullborrkrona
WO2011075094A1 (fr) * 2009-12-14 2011-06-23 Kupchinsky Igor Aleksandrovich Dispositif pour isoler le support de palier d’un trépan de forage du milieu environnant

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3921735A (en) * 1975-02-27 1975-11-25 Dresser Ind Rotary rock bit with cone mouth air screen
NL7609328A (nl) * 1976-08-23 1978-02-27 Skf Ind Trading & Dev Rolbeitel.
SE7703810L (sv) * 1977-04-01 1978-10-02 Sandvik Ab Tetningsanordning vid rullborrkronor
SE428139B (sv) * 1979-03-28 1983-06-06 Sandvik Ab Bergborrkrona

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8201909A1 *

Also Published As

Publication number Publication date
ZA816742B (en) 1982-09-29
BR8107552A (pt) 1982-08-17
AU7591681A (en) 1982-06-10
WO1982001909A1 (fr) 1982-06-10
SE8008430L (sv) 1982-06-03

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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: 19820720

AK Designated contracting states

Designated state(s): DE FR GB NL

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

Withdrawal date: 19840109

RIN1 Information on inventor provided before grant (corrected)

Inventor name: NORLANDER, GOESTA

Inventor name: KARLSSON, LENNART