EP1052368A1 - Assembly of a shaft and a boss connectable to it - Google Patents

Assembly of a shaft and a boss connectable to it Download PDF

Info

Publication number
EP1052368A1
EP1052368A1 EP00201554A EP00201554A EP1052368A1 EP 1052368 A1 EP1052368 A1 EP 1052368A1 EP 00201554 A EP00201554 A EP 00201554A EP 00201554 A EP00201554 A EP 00201554A EP 1052368 A1 EP1052368 A1 EP 1052368A1
Authority
EP
European Patent Office
Prior art keywords
shaft
boss
cutter
screw thread
parts
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Withdrawn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
EP00201554A
Other languages
German (de)
English (en)
French (fr)
Inventor
Roelof Breken
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.)
IHC Holland NV
Original Assignee
IHC Holland NV
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 IHC Holland NV filed Critical IHC Holland NV
Publication of EP1052368A1 publication Critical patent/EP1052368A1/en
Withdrawn legal-status Critical Current

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Classifications

    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/02Couplings; joints
    • E21B17/04Couplings; joints between rod or the like and bit or between rod and rod or the like
    • E21B17/042Threaded

Definitions

  • the invention relates to an assembly of an engine-driven shaft and a boss connectable with it, of a part mountable on said shaft, in which, for establishing said connection, said shaft and said boss are provided with mutually adapted screw threads arranged on an outer and inner conical part, respectively, said screw thread having a trapezoidal cross-section.
  • the end position of engaging parts is determined in that the boss almost abuts a shoulder on the shaft.
  • the remaining small tolerance is eliminated by exerting a moment on the drilling rod, as a result of which the screw thread will be slightly deformed, so that the boss will come to lie against the shoulder of said shaft.
  • said known assembly is particularly suited for accomodating impact forces exerted on the shaft in its longitudinal direction.
  • the shaft will be subject to tensile forces and pressure forces so that certain threads of both screw threads will be loaded more strongly than other threads. This will adversely affect the strength of the connection.
  • impact forces will occur to a lesser degree than radial and tangential loads.
  • both screw threads of both parts and the parts themselves are designed such, that screwing said parts together can take place until one flank and top of one screw thread tightly abut a flank and a valley of the screw thread of said other part, in which both screw threads, having a cross-section substantially in the shape of an isosceles trapezium, have been designed such, that there is tolerance between the other flanks.
  • the cutter When applying the invention, on mounting the cutter, it can be slid across part of the conical end of the shaft so that it is centered in relation to said shaft, before it should be rotated. Thus, in sliding on the shaft, the cutter will almost automatically end up in the correct position in relation to the shaft.
  • the number of rotations to be performed by the cutter during mounting can be much smaller than in case of cylindrical screw thread.
  • the loosening moment is smaller than the moment that can be produced by the engine with a directio of rotation opposite to the normal direction of rotation. Then, the boss can be held and the engine can be rotated in said direction of rotation.
  • DE-659.079 can be referred to, from which it is known per se to provide conical parts of a shaft and a boss with screw thread, in which the shaft is not provided with a shoulder to be abutted by said boss.
  • a screw thread having a sawtooth cross-section is used, its planes square to the longitudinal axis serving for absorbing the impact forces exerted on the shaft. It will be clear, that the sharp angles of the teeth are susceptible to damage. This would be a disadvantage with employment with a cutter and cutter shaft particularly when the cutter is to be replaced under operating conditions.
  • EP-0273016 shows a connection between two pipes almost corresponding to the one disclosed in EP-0703396.
  • US Patents 4508375, 5498035, 4828295, 5360239 and DE Patent DE-207183 also relate to sealingly connecting pipes.
  • the sealing between the parts plays no role whatsoever, but the only aim is to obtain a best possible connection between said parts, as a consequence of which a large torque can be transferred.
  • Fig. 1 shows a cross-section across a part of the shaft and the boss before it is screwed onto said shaft.
  • the shaft is indicated by 1 and the threaded 2 conical part by 3.
  • the cutter 4 is provided with a boss 5 having a conical bore 6, in which screw thread 7 has been provided.
  • the screw thread 7 of the boss 5 will have to be adapted to the screw thread 2 of the shaft 1. This should be taken into account when replacing a cutter 4.
  • the invention relates both to the design of the shaft 1 and of the boss 5, which can be separate parts.
  • Fig. 2 shows the end of the cutter shaft 3 on which the screw thread 2 is provided. Seen in an axial plane, the apex ⁇ of the conical part 3 and of the outer plane 8 of the screw thread will be between 10° and 50°.
  • the cross-section of the screw thread is trapezoidal and the angle ⁇ enclosed by the flanks 9 and 10 of the scrw thread, seen in an axial plane, will be between 10° and 50°.
  • the top 13 of the screw thread 2 does not abut the valley 14 of the screw thread 7, but the top of the screw thread 7 abuts the valley of the screw thread 2.

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)
  • Screw Conveyors (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP00201554A 1999-05-12 2000-05-02 Assembly of a shaft and a boss connectable to it Withdrawn EP1052368A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1012048 1999-05-12
NL1012048A NL1012048C2 (nl) 1999-05-12 1999-05-12 Samenstel van een as en een daarmee te verbinden naaf.

Publications (1)

Publication Number Publication Date
EP1052368A1 true EP1052368A1 (en) 2000-11-15

Family

ID=19769183

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00201554A Withdrawn EP1052368A1 (en) 1999-05-12 2000-05-02 Assembly of a shaft and a boss connectable to it

Country Status (2)

Country Link
EP (1) EP1052368A1 (nl)
NL (1) NL1012048C2 (nl)

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE659079C (de) * 1935-09-19 1938-11-24 Hermann Prager Schraubverbindung zwischen Bohrerstange und Bohrkrone fuer Gesteinsschlagbohrer
US3933210A (en) * 1974-10-11 1976-01-20 Skidmore Sam C Drill head assembly
DE3207183C1 (de) * 1982-02-27 1983-06-09 Mannesmann AG, 4000 Düsseldorf Rohrverbindung für Metallrohre
US4508375A (en) * 1982-09-20 1985-04-02 Lone Star Steel Company Tubular connection
US4512596A (en) * 1982-04-19 1985-04-23 Alsthom-Atlantique Anti-unscrewing devices
EP0273016A2 (en) * 1986-12-23 1988-06-29 DALMINE S.p.A. Threaded coupling for well casings
US4828295A (en) * 1984-10-10 1989-05-09 Vallourec Steel tube threaded joint having an impervious device at the level of the threading
US5169183A (en) * 1987-05-12 1992-12-08 Diamant Boart Stratabit S.A. Threaded joint for drill rod elements
EP0604362A1 (de) * 1992-12-19 1994-06-29 HILTI Aktiengesellschaft Bohreinheit mit Hohlbohrkrone und Adapter
US5360239A (en) * 1989-07-28 1994-11-01 Antares Marketing, S.A. Threaded tubular connection
US5498035A (en) * 1990-01-19 1996-03-12 Blose; Thomas L. Pipe coupling
EP0703396A1 (en) * 1994-09-23 1996-03-27 Sumitomo Chemical Company, Limited Threaded joint for oil well pipes
WO1998042945A1 (en) * 1997-03-24 1998-10-01 C-Fer Technologies Inc. Rotary drive shaft for downhole pump

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE659079C (de) * 1935-09-19 1938-11-24 Hermann Prager Schraubverbindung zwischen Bohrerstange und Bohrkrone fuer Gesteinsschlagbohrer
US3933210A (en) * 1974-10-11 1976-01-20 Skidmore Sam C Drill head assembly
DE3207183C1 (de) * 1982-02-27 1983-06-09 Mannesmann AG, 4000 Düsseldorf Rohrverbindung für Metallrohre
US4512596A (en) * 1982-04-19 1985-04-23 Alsthom-Atlantique Anti-unscrewing devices
US4508375A (en) * 1982-09-20 1985-04-02 Lone Star Steel Company Tubular connection
US4828295A (en) * 1984-10-10 1989-05-09 Vallourec Steel tube threaded joint having an impervious device at the level of the threading
EP0273016A2 (en) * 1986-12-23 1988-06-29 DALMINE S.p.A. Threaded coupling for well casings
US5169183A (en) * 1987-05-12 1992-12-08 Diamant Boart Stratabit S.A. Threaded joint for drill rod elements
US5360239A (en) * 1989-07-28 1994-11-01 Antares Marketing, S.A. Threaded tubular connection
US5498035A (en) * 1990-01-19 1996-03-12 Blose; Thomas L. Pipe coupling
EP0604362A1 (de) * 1992-12-19 1994-06-29 HILTI Aktiengesellschaft Bohreinheit mit Hohlbohrkrone und Adapter
EP0703396A1 (en) * 1994-09-23 1996-03-27 Sumitomo Chemical Company, Limited Threaded joint for oil well pipes
WO1998042945A1 (en) * 1997-03-24 1998-10-01 C-Fer Technologies Inc. Rotary drive shaft for downhole pump

Also Published As

Publication number Publication date
NL1012048C2 (nl) 2000-11-14

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