WO2003078787A1 - Grease filling arrangement in a cutter for a boring head - Google Patents

Grease filling arrangement in a cutter for a boring head Download PDF

Info

Publication number
WO2003078787A1
WO2003078787A1 PCT/SE2003/000433 SE0300433W WO03078787A1 WO 2003078787 A1 WO2003078787 A1 WO 2003078787A1 SE 0300433 W SE0300433 W SE 0300433W WO 03078787 A1 WO03078787 A1 WO 03078787A1
Authority
WO
WIPO (PCT)
Prior art keywords
cutter
shaft
passageway
arrangement according
bearing
Prior art date
Application number
PCT/SE2003/000433
Other languages
French (fr)
Inventor
Jonas Thuresson
Lars Holmgren
Original Assignee
Atlas Copco Secoroc 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 Atlas Copco Secoroc Ab filed Critical Atlas Copco Secoroc Ab
Priority to EP03744578A priority Critical patent/EP1490577B1/en
Priority to DE60308160T priority patent/DE60308160D1/en
Priority to US10/508,246 priority patent/US20060249311A1/en
Priority to CA2479430A priority patent/CA2479430C/en
Priority to AU2003210101A priority patent/AU2003210101B2/en
Publication of WO2003078787A1 publication Critical patent/WO2003078787A1/en
Priority to US11/855,688 priority patent/US7445062B2/en

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
    • E21B10/24—Roller bits characterised by bearing, lubrication or sealing details characterised by lubricating details

Definitions

  • the present invention relates to an arrangement pertaining to the replenishment of drill cutters with lubricating grease, and then particularly such cutters as those that are used in drilling bits for raise drilling.
  • a reamer is a drill bit that is normally drawn up through a predrilled hole by means of a rod extending in the hole.
  • the reamer includes a carrier to whose upper side there is attached a drilling tool in the form of a number of so-called cutters. These cutters rotate against the rock surface, or stone surface, with which they are in abutment, as the reamer rotates in response to rotation of the rod.
  • the cutters have a frusto-conical shape and are mounted with the largest diameter facing outwards, i.e. away from the rod disposed centrally in said carrier.
  • the cutters are mounted on shafts accommodated in the attachments carried on the upper side of the carrier, with the axes of respective cutters extending mainly radially to the rod.
  • the cutters are provided with bearings by means of which the cutters are able to rotate about their respective axes. These bearings and also the seals between cutter and cutter shaft are kept lubricated with grease fed into the cutter interior.
  • a shaft is usually filled with lubricating grease, by injecting the grease through a nipple at one end of the shaft and allowing the grease to flow out through a nipple hole on the other end of said shaft.
  • an object of the present invention is to provide a novel arrangement for refilling drill hole cutters of the aforesaid kind with lubricating grease.
  • Fig. 1 is a schematic perspective view of part of a reamer having a number of cutters
  • Fig. 2 is a perspective view of a cutter
  • Fig. 3 is a longitudinally sectioned view of a cutter.
  • Fig. 1 Shown in Fig. 1 is part of a reamer that includes a carrier 1 which is supported by a rotatable rod 2.
  • the carrier 1 has disposed on its upper side a number of cutters 3, in the illustrated case four such cutters.
  • the cutters 3 are mounted in fasteners 4 provided on the carrier, with the cutter shafts 5 fitted in the fasteners 4.
  • the cutters 3 have a frusto-conical shape with the narrower end 6 of the cutters facing inwards towards the rod 2 mounted centrally in the carrier 1.
  • the cutter shafts 5 are fixedly mounted in the fasteners.
  • the cutter shafts 5 are not rotatable in the fasteners 4, but that the conical outer barrel 7 of the cutters 3 is able to rotate about the shaft 5 disposed centrally in the cutter.
  • the cutter has disposed about its outer barrel surface a number of inserts 8 made, for instance, of tungsten carbide and functioning to cut the rock or stone in a drilling operation.
  • the outer barrel 7 of respective cutters 3 is subjected to large stresses and strains and is rotatably mounted on the shaft 5 by means of strong bearings 9, 10.
  • Fitted to both end walls of the barrel 7 are wall elements 11, 12 which seal between the barrel 7 and the shaft 5.
  • the internal space 13 is normally filled with grease for lubrication of the bearings 9, 10.
  • the wall elements 11, 12 are sealed against the barrel 7 and the shaft 5 by means of end seals 14, 15 that include slip seals and 0-rings.
  • lubricating grease is delivered to the bearing accommodating space 13 of the cutter through a longitudinally extending passageway 16, which extends centrally in the shaft 5 from that end of the cutter which has the largest diameter.
  • a filling nipple 17 is provided at this end of the shaft, such as to enable grease to be delivered to said bearing space with the aid of a typical grease gun.
  • the passageway 16 extends from said cutter end to a position beyond the innermost bearing 9 as seen from said end.
  • the passageway 16 communicates at this position with a transverse passageway 18 which opens into the bearing- accommodating space 13 beyond the innermost bearing 9.
  • a drainage nip- pie 19 through which old lubricating grease can be drained from the cutter interior when replacing the old grease with fresh grease.
  • the same end wall 12 will also preferably include an overpressure valve 20 which opens automatically should the pressure in the internal space 13 of the cutter become excessively high, therewith releasing grease from said space.
  • the transverse passageway 18 is preferably provided in a stress-neutral region of the shaft, particularly so that the outlet of the transverse passageway 18 into the cutter lies in a stress-neutral region.
  • the force arrow 21 shown in Fig. 3 indicates the normal force flow, wherewith the transverse passageway 18 is disposed generally at right angles to the line of action of the main force.
  • the transverse passageway 18 extends at right angles in both directions from the passageway 16 provided in the shaft 5. This is a pre- ferred feature of the invention, since it is then possible to deliver grease to two diametrically located positions of the shaft 5 within the inner space 13 of the cutter, therewith ensuring more positively that the entire space 13 will be filled with grease.
  • the transverse passageway may extend in only one direction essentially radially outwards from the longitudinally extending passageway 16.
  • the transverse passageway may be orientated to extend generally at right angles to the line of attack of the main force.
  • the transverse passageway 18 is orientated so that it will lie generally horizontal when the cutter is fitted in its position of use on a reamer. As the reamer is used, the direction of attack of the main force will be generally vertical, since the reamer is drawn up through a pre- drilled vertical hole or bore.
  • the arrangement of the lubricating passageways 16, 18 in accordance with the invention ensures that all bearings in the cutter 3 will be properly lubricated, so as to avoid damage to the bearings, despite the fact that lubricating grease is delivered from the same end as that from which old and spent grease shall flow out.
  • the bearing- grease replenishing nipple 17 may be provided in the larger end wall of the cutter distal from the rod seated centrally in the reamer, so that easy access can be had to both the refilling nipple 17 and the drainage nipple 19.

Landscapes

  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)
  • Drilling And Boring (AREA)
  • Auxiliary Devices For Machine Tools (AREA)
  • Milling, Broaching, Filing, Reaming, And Others (AREA)
  • Cutting Tools, Boring Holders, And Turrets (AREA)

Abstract

The present invention relates to an arrangement for replenishing lubricating grease in drill cutters (3) that include a conical outer barrel (7) which is rotatable about a shaft (5) disposed centrally in the cutter, wherein there is provided in the cutter shaft (5) a passageway (16) that extends along the shaft from the cutter end of largest diameter and that connects with a transverse passageway (18) which opens into a bearing-accommodating space (13) in said cutter for delivering lubricating grease to said space (13), and wherein a lubricating nipple (19) is provided on the cutter end wall of largest diameter and functions to allow lubricating grease to be released from said bearing-accommodating space (13).

Description

GREASE FILLING ARRANGEMENT IN A CUTTER FOR A BORING HEAD
The present invention relates to an arrangement pertaining to the replenishment of drill cutters with lubricating grease, and then particularly such cutters as those that are used in drilling bits for raise drilling.
A reamer is a drill bit that is normally drawn up through a predrilled hole by means of a rod extending in the hole. The reamer includes a carrier to whose upper side there is attached a drilling tool in the form of a number of so-called cutters. These cutters rotate against the rock surface, or stone surface, with which they are in abutment, as the reamer rotates in response to rotation of the rod. The cutters have a frusto-conical shape and are mounted with the largest diameter facing outwards, i.e. away from the rod disposed centrally in said carrier. The cutters are mounted on shafts accommodated in the attachments carried on the upper side of the carrier, with the axes of respective cutters extending mainly radially to the rod.
In turn, the cutters are provided with bearings by means of which the cutters are able to rotate about their respective axes. These bearings and also the seals between cutter and cutter shaft are kept lubricated with grease fed into the cutter interior. A shaft is usually filled with lubricating grease, by injecting the grease through a nipple at one end of the shaft and allowing the grease to flow out through a nipple hole on the other end of said shaft. This method func- tions very effectively provided that the cutter is not mounted within the reamer. However, when it becomes necessary to replenish or change the grease, which must done often when underground conditions are troublesome, it is difficult to reach the nipple seated at the narrower end of the cutter facing inwards towards the rod.
Accordingly, an object of the present invention is to provide a novel arrangement for refilling drill hole cutters of the aforesaid kind with lubricating grease.
This object is achieved with an arrangement according to the present invention in which there is provided a passageway which extends along the shaft from the cutter end of largest diameter and which communicates with a transverse passageway that opens into the space accommodating a cutter bearing, for the supply of lubricating grease to said space, and in which there is provided in the cutter wall of largest diameter a lubricating nipple that functions to allow lubricating grease to exit from said bearing accommodating space.
The invention will now be described in more detail with reference to a non-limiting embodiment thereof and also with reference to the accompanying drawings, in which Fig. 1 is a schematic perspective view of part of a reamer having a number of cutters; Fig. 2 is a perspective view of a cutter; and Fig. 3 is a longitudinally sectioned view of a cutter.
Shown in Fig. 1 is part of a reamer that includes a carrier 1 which is supported by a rotatable rod 2. The carrier 1 has disposed on its upper side a number of cutters 3, in the illustrated case four such cutters. The cutters 3 are mounted in fasteners 4 provided on the carrier, with the cutter shafts 5 fitted in the fasteners 4. As will be seen, the cutters 3 have a frusto-conical shape with the narrower end 6 of the cutters facing inwards towards the rod 2 mounted centrally in the carrier 1. The cutter shafts 5 are fixedly mounted in the fasteners. In other words, the cutter shafts 5 are not rotatable in the fasteners 4, but that the conical outer barrel 7 of the cutters 3 is able to rotate about the shaft 5 disposed centrally in the cutter. The cutter has disposed about its outer barrel surface a number of inserts 8 made, for instance, of tungsten carbide and functioning to cut the rock or stone in a drilling operation.
The outer barrel 7 of respective cutters 3 is subjected to large stresses and strains and is rotatably mounted on the shaft 5 by means of strong bearings 9, 10. Fitted to both end walls of the barrel 7 are wall elements 11, 12 which seal between the barrel 7 and the shaft 5. There is formed in this way an internally closed space 13 which accommodates the bearings 9, 10 and also end seals 14, 15. The internal space 13 is normally filled with grease for lubrication of the bearings 9, 10. The wall elements 11, 12 are sealed against the barrel 7 and the shaft 5 by means of end seals 14, 15 that include slip seals and 0-rings.
According to the present invention, lubricating grease is delivered to the bearing accommodating space 13 of the cutter through a longitudinally extending passageway 16, which extends centrally in the shaft 5 from that end of the cutter which has the largest diameter. A filling nipple 17 is provided at this end of the shaft, such as to enable grease to be delivered to said bearing space with the aid of a typical grease gun. The passageway 16 extends from said cutter end to a position beyond the innermost bearing 9 as seen from said end. The passageway 16 communicates at this position with a transverse passageway 18 which opens into the bearing- accommodating space 13 beyond the innermost bearing 9. Also provided in the end wall 12 of the cutter is a drainage nip- pie 19 through which old lubricating grease can be drained from the cutter interior when replacing the old grease with fresh grease. The same end wall 12 will also preferably include an overpressure valve 20 which opens automatically should the pressure in the internal space 13 of the cutter become excessively high, therewith releasing grease from said space.
The transverse passageway 18 is preferably provided in a stress-neutral region of the shaft, particularly so that the outlet of the transverse passageway 18 into the cutter lies in a stress-neutral region. The force arrow 21 shown in Fig. 3 indicates the normal force flow, wherewith the transverse passageway 18 is disposed generally at right angles to the line of action of the main force.
In the case of the illustrated embodiment, the transverse passageway 18 extends at right angles in both directions from the passageway 16 provided in the shaft 5. This is a pre- ferred feature of the invention, since it is then possible to deliver grease to two diametrically located positions of the shaft 5 within the inner space 13 of the cutter, therewith ensuring more positively that the entire space 13 will be filled with grease.
However, the transverse passageway may extend in only one direction essentially radially outwards from the longitudinally extending passageway 16. Alternatively, the transverse passageway may be orientated to extend generally at right angles to the line of attack of the main force.
In practice, the transverse passageway 18 is orientated so that it will lie generally horizontal when the cutter is fitted in its position of use on a reamer. As the reamer is used, the direction of attack of the main force will be generally vertical, since the reamer is drawn up through a pre- drilled vertical hole or bore.
The arrangement of the lubricating passageways 16, 18 in accordance with the invention ensures that all bearings in the cutter 3 will be properly lubricated, so as to avoid damage to the bearings, despite the fact that lubricating grease is delivered from the same end as that from which old and spent grease shall flow out. Despite this, the bearing- grease replenishing nipple 17 may be provided in the larger end wall of the cutter distal from the rod seated centrally in the reamer, so that easy access can be had to both the refilling nipple 17 and the drainage nipple 19.

Claims

1. An arrangement for replenishing lubricating grease in drill cutters (3) that include a conical outer barrel (7) which is rotatable about a shaft (5) disposed centrally in the cutter, characterised by a passageway (16) that extends longitudinally in the cutter shaft (5) from the cutter end of largest diameter and that connects with a transverse passageway (18) which opens into a bearing-accommodating space (13) in said cutter for delivering lubricating grease to said space (13) ; and by a lubricating nipple (19) provided on the cutter end wall of largest diameter and functioning to allow lubricating grease to be released from said bearing- accommodating space (13) .
2 . An arrangement according to Claim 1, characterised in that the longitudinally extending passageway (16) is disposed centrally in the cutter shaft (5) .
3. An arrangement according to Claim 1 or 2, characterised in that the transverse passageway is located in a stress-neutral region of the cutter shaft (5) .
4. An arrangement according to Claim 3, characterised in that the transverse passageway (18) is orientated generally horizontally when the cutter is mounted on a reamer in its position of use.
5. An arrangement according to any one of the preceding Claims, characterised in that the transverse passageway (18) extends generally radially out from the longitudinally extending passageway (16) .
6. An arrangement according to any one of the preceding Claims, characterised in that the transverse passageway (18) extends out in generally opposite directions from the longitudinally extending passageway (16) and opens out at two diametrically opposite places on the shaft (5) .
7. An arrangement according to any one of the preceding Claims, characterised in that the transverse passageway (18) opens out at a position beyond the innermost bearing (9) of said bearings (9, 10) disposed between the outer barrel (7) of the cutter and the shaft (5) as seen from the cutter end of largest diameter.
PCT/SE2003/000433 2002-03-20 2003-03-14 Grease filling arrangement in a cutter for a boring head WO2003078787A1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
EP03744578A EP1490577B1 (en) 2002-03-20 2003-03-14 Grease filling arrangement in a cutter for a boring head
DE60308160T DE60308160D1 (en) 2002-03-20 2003-03-14 FAT FILLING ASSEMBLY IN A CUTTING DEVICE FOR A DRILL HEAD
US10/508,246 US20060249311A1 (en) 2002-03-20 2003-03-14 Grease filling arrangement in a cutter for a boring head
CA2479430A CA2479430C (en) 2002-03-20 2003-03-14 Grease filling arrangement in a cutter for a boring head
AU2003210101A AU2003210101B2 (en) 2002-03-20 2003-03-14 Grease filling arrangement in a cutter for a boring head
US11/855,688 US7445062B2 (en) 2002-03-20 2007-09-14 Grease filling arrangement in a cutter for a boring head

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0200875A SE523950C2 (en) 2002-03-20 2002-03-20 Arrangements for filling grease in drill cutters
SE0200875-3 2002-03-20

Related Child Applications (2)

Application Number Title Priority Date Filing Date
US10508246 A-371-Of-International 2003-03-14
US11/855,688 Division US7445062B2 (en) 2002-03-20 2007-09-14 Grease filling arrangement in a cutter for a boring head

Publications (1)

Publication Number Publication Date
WO2003078787A1 true WO2003078787A1 (en) 2003-09-25

Family

ID=20287355

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2003/000433 WO2003078787A1 (en) 2002-03-20 2003-03-14 Grease filling arrangement in a cutter for a boring head

Country Status (10)

Country Link
US (2) US20060249311A1 (en)
EP (1) EP1490577B1 (en)
AT (1) ATE338876T1 (en)
AU (1) AU2003210101B2 (en)
CA (1) CA2479430C (en)
DE (1) DE60308160D1 (en)
RU (1) RU2327850C2 (en)
SE (1) SE523950C2 (en)
WO (1) WO2003078787A1 (en)
ZA (1) ZA200407458B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102748459A (en) * 2012-06-27 2012-10-24 三一重型装备有限公司 Cutting reducer for heading machine, as well as heading machine with cutting reducer
US8464813B2 (en) 2006-06-20 2013-06-18 Atlas Copco Secoroc Llc Cutter assembly for a raise boring reamer
CN110331939A (en) * 2019-07-10 2019-10-15 镇江市凯越工具有限公司 A kind of dedicated reamer of rock

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7735583B2 (en) * 2007-11-21 2010-06-15 Baker Hughes Incorporated Roller cone bit bearing with elastomeric seal having self break-in property and method
US7861805B2 (en) * 2008-05-15 2011-01-04 Baker Hughes Incorporated Conformal bearing for rock drill bit
EP3073045B1 (en) 2015-03-25 2018-01-31 Sandvik Intellectual Property AB Cutter for boring head
CN108473335B (en) * 2016-01-08 2020-08-18 日清工程株式会社 Method for producing titanium oxide fine particles having no specific ratio
CA3101468A1 (en) 2018-05-29 2019-12-05 Quanta Associates, L.P. Horizontal directional reaming
US11708726B2 (en) * 2018-05-29 2023-07-25 Quanta Associates, L.P. Horizontal directional reaming

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US2906504A (en) * 1958-08-07 1959-09-29 Jersey Prod Res Co Lubrication of bearings
US3413045A (en) * 1967-04-19 1968-11-26 Smith Ind Internat Inc Sealed lubricated reamer-stabilizer
US5520257A (en) * 1994-12-05 1996-05-28 Baker Hughes Incorporated Bit with ball plug compensator having pressure relief means
WO1996025581A1 (en) * 1995-02-14 1996-08-22 Sandvik Ab Cutter for a boring head

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SE414955B (en) * 1977-09-09 1980-08-25 Sandvik Ab STIGORTS DRIVING CHRONICLE
SU926222A1 (en) 1980-09-05 1982-05-07 Производственное Объединение "Куйбышевбурмаш" Министерства Химического И Нефтяного Машиностроения Ссср Device for lubricating bearing of sealed cutter bit support
US4709462A (en) * 1986-08-04 1987-12-01 Oil Patch Group, Inc. Method for assembling a well drilling tool
US5137097A (en) * 1990-10-30 1992-08-11 Modular Engineering Modular drill bit
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Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2906504A (en) * 1958-08-07 1959-09-29 Jersey Prod Res Co Lubrication of bearings
US3413045A (en) * 1967-04-19 1968-11-26 Smith Ind Internat Inc Sealed lubricated reamer-stabilizer
US5520257A (en) * 1994-12-05 1996-05-28 Baker Hughes Incorporated Bit with ball plug compensator having pressure relief means
WO1996025581A1 (en) * 1995-02-14 1996-08-22 Sandvik Ab Cutter for a boring head

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8464813B2 (en) 2006-06-20 2013-06-18 Atlas Copco Secoroc Llc Cutter assembly for a raise boring reamer
CN102748459A (en) * 2012-06-27 2012-10-24 三一重型装备有限公司 Cutting reducer for heading machine, as well as heading machine with cutting reducer
CN102748459B (en) * 2012-06-27 2015-04-22 三一重型装备有限公司 Cutting reducer for heading machine, as well as heading machine with cutting reducer
CN110331939A (en) * 2019-07-10 2019-10-15 镇江市凯越工具有限公司 A kind of dedicated reamer of rock

Also Published As

Publication number Publication date
US20080000695A1 (en) 2008-01-03
US20060249311A1 (en) 2006-11-09
DE60308160D1 (en) 2006-10-19
EP1490577B1 (en) 2006-09-06
RU2004130861A (en) 2005-05-27
SE0200875D0 (en) 2002-03-20
CA2479430A1 (en) 2003-09-25
SE523950C2 (en) 2004-06-08
SE0200875L (en) 2003-09-21
US7445062B2 (en) 2008-11-04
RU2327850C2 (en) 2008-06-27
EP1490577A1 (en) 2004-12-29
ATE338876T1 (en) 2006-09-15
AU2003210101B2 (en) 2008-02-28
AU2003210101A1 (en) 2003-09-29
CA2479430C (en) 2010-12-07
ZA200407458B (en) 2005-10-12

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