EP0042548A1 - Dispositif de vissage à détection du couple - Google Patents

Dispositif de vissage à détection du couple Download PDF

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Publication number
EP0042548A1
EP0042548A1 EP81104499A EP81104499A EP0042548A1 EP 0042548 A1 EP0042548 A1 EP 0042548A1 EP 81104499 A EP81104499 A EP 81104499A EP 81104499 A EP81104499 A EP 81104499A EP 0042548 A1 EP0042548 A1 EP 0042548A1
Authority
EP
European Patent Office
Prior art keywords
housing
switch
screwing device
pipe section
torque
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.)
Granted
Application number
EP81104499A
Other languages
German (de)
English (en)
Other versions
EP0042548B1 (fr
Inventor
Johann Müller
Karl Richard Hirtsiefer
Oswald Dubiel
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.)
Wagner Paul-Heinz
Original Assignee
Wagner Paul-Heinz
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 Wagner Paul-Heinz filed Critical Wagner Paul-Heinz
Priority to AT81104499T priority Critical patent/ATE6223T1/de
Publication of EP0042548A1 publication Critical patent/EP0042548A1/fr
Application granted granted Critical
Publication of EP0042548B1 publication Critical patent/EP0042548B1/fr
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
    • B25B23/14—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers
    • B25B23/145—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for fluid operated wrenches or screwdrivers
    • B25B23/1456—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for fluid operated wrenches or screwdrivers having electrical components
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
    • B25B23/14—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers

Definitions

  • the invention relates to a screwing device with torque determination, with a drive device arranged in a housing, the output shaft of which protrudes from the housing, a support leg coupled to the housing via an elastic connecting device and longitudinally movable along a sleeve with a non-circular profile for holding the housing against rotation and with a Device for determining the tightening torque by determining the supporting torque acting on the support foot.
  • the housing of the drive device has an extension on which a support leg is longitudinally displaceable but non-rotatably guided.
  • the support leg is formed in two parts and it consists of a tube connected to the neck in a rotationally fixed manner and a housing rotatably mounted on the tube.
  • the projecting arm of the pipe acts on a housing attached to the K raftmeßvorraum, which comprises a display device. If a force acts on the support foot, then the tube in the housing moves and the relevant force is displayed on the display device.
  • the known screw device has the disadvantage that the support foot must be formed in two parts, and that both parts of the support foot must be mounted coaxially to each other.
  • the torque to be displayed can be falsified by the friction losses in the pivot bearings and by jamming or tilting.
  • the support leg must have a protruding arm to which the force measuring device is attached. This gives the entire device relatively large dimensions in the radial direction, so that the possible uses of the screw device are limited.
  • a torque measuring device is built into the screw spindle of the screwing machine.
  • This torque measuring device contains a torsionally elastic intermediate part which is non-rotatably connected to the screw spindle at one end and non-rotatably connected to a drive flange at its other end.
  • Torque measurement is therefore only possible if an upstream slip clutch has triggered.
  • the reading is made more difficult by the fact that after the screw spindle has come to a standstill, the point at which the marking for reading the torque is located must first be sought.
  • the invention has for its object to provide a screwing device of the type mentioned, in which the component which triggers the torque limitation is arranged at the output of the screwdriver, that is to say in the immediate vicinity of the screw, and does not require any intervention in the output shaft of the drive device which transmits the screwing force.
  • the connecting device is a torsionable part surrounding the output shaft, one end of which is attached to the housing in a rotationally fixed manner and the other end of which engages in a rotationally fixed manner on the sleeve.
  • the reaction force acting on the support foot is used to determine the torque, but the deformable component is not attached to the support foot itself, but rather coaxially surrounds the output shaft of the power wrench.
  • the torsionally elastic connecting piece is increasingly twisted during the screwing process with increasing screwing torque and actuates the elastic switch when a certain deformation amplitude has been reached. This increases the weight and size of the power wrench only insignificantly.
  • Characterized in that the torsionally elastic connector surrounds the output shaft or part of the housing with a small distance a favorable adaptation of the shape of the connector to the housing shape is achieved, so that the torque limiter does not significantly increase the volume of the power wrench.
  • the twistable (torsionally elastic) part can be a piece of pipe which is held at one end by the housing, while the other end is twisted by the support foot.
  • the T orsionspunung between the two ends of the tube piece is in this case as a measure of the applied torque. used.
  • Strain gauges can also be attached to the pipe section, which determine the deformation of the pipe section and are connected to an electrical evaluation circuit.
  • the torsional elasticity of the connecting device can easily be brought to the required level by the shape and size of slots or other openings which are provided on the connecting device.
  • the connecting device is usually made of steel or another material with the required elasticity. This means that even high torques at small torsion angles can be determined with great accuracy.
  • the torque can be determined in such a way that when a certain limit value of the torque is reached, a switch is actuated which switches off the drive device. Another possibility is to carry out a continuous measurement and display of the respective torque, the operator switching off the device when the torque has reached a certain size.
  • the pipe section carry a switching part for actuating an electrical switch.
  • the switch and the switching part are attached to the pipe section offset in the axial direction to one another and the switching part acts on the switch via an arm.
  • an exact defined attachment of the twistable connecting device to the housing of the screwing device is not necessary.
  • such a defined attachment is required if the switching part is attached to the torsionally flexible connecting device, the switch is attached to the housing, or vice versa.
  • the switching part closes the switch in the unloaded state and that the coupling between the switching part and the switch is interrupted when the predetermined torsion angle is reached.
  • the switch thus has the function of a normally closed contact, that is to say a contact which is normally closed and which is opened to switch off the drive device. If the switch malfunctions, the drive device is switched off in this way.
  • a spring which moves the arm in the direction of the switch and a spring which limits the movement of the arm and the arm lifting off the switch stop is connected in a substantially rotationally fixed manner to the housing or the housing-side end of the torsionally elastic connecting piece.
  • the support foot causes the creation of a torsional moment on the torsionally flexible connecting device, but it is not itself a component of the device for torque limitation. Its shape and dimensions are not included in the measurement result or the switching point.
  • the connecting device has a tooth profile at its end, on which a ring of the support foot is guided so as to be longitudinally displaceable and non-rotatable.
  • the invention is based on the idea of determining the torque by measuring a torsion movement that is as pure as possible.
  • the end of the connecting device is mounted on a cylindrical extension of the housing.
  • the connecting device as a twistable part, has an essentially radial measuring flange which, at its inner end, is connected non-rotatably to the sleeve and at its outer end, but non-rotatably but longitudinally displaceably connected to the housing.
  • the measuring flange is not rigidly clamped at both ends, but that at least one end is relative to the housing of the screw device is longitudinally displaceable. In this way it is prevented that transverse forces and bending stresses are transmitted from the support foot to the measuring flange, as a result of which the measurement result would be falsified.
  • the measuring flange must be able to adjust freely in the axial direction at least at one end - but preferably at both ends. Strain gauges can be attached to one of the two end faces of the measuring flange, which measure the torsional deformation of the measuring flange and display them on a display device.
  • the power screwdriver shown in FIGS. 1-5 has a drive device 11, which is accommodated in a housing 10 and which can consist, for example, of a hydraulic motor.
  • a housing 10 which can consist, for example, of a hydraulic motor.
  • the drive device 11 is only indicated in FIG. 2, but is not shown in more detail in the rest.
  • the housing 10 is essentially cylindrical and has at its front end an axially projecting hollow extension 12 with a reduced diameter, through which the output shaft 13 of the drive device 11 projects.
  • At the outer end of the drive shaft 13 there is a square 14 for attaching a key nut or the like.
  • the pipe section 16 is fastened to an annular flange 15 which runs around the housing 10 with an annular flange 17.
  • the torsionally flexible pipe section 16 consists of the cage shown in FIG. 5.
  • a cylindrical section 18 adjoins the ring flange 17, the cylinder wall of which is interrupted by numerous parallel longitudinal slots 19.
  • the slots 19 each continue a short distance in an inward end wall 20.
  • a sleeve 21 projects from the end wall 20 and has a toothing 22 or longitudinal splines. As can be seen from Fig. 2, the sleeve 21 is mounted on the neck 12 of the housing 10, while the twistable part 18 of the pipe section 16 is the end of the Ge encloses house to form a small annular space.
  • the pipe section 16 thus adapts essentially to the contour of the part of the housing 10 enclosed by it.
  • a ring 23 is slid onto the toothing 22 on the front sleeve 21 of the pipe section 16 and has an internal toothing that fits into the toothing 22.
  • the ring 23 is part of the support foot 24, which has an arm projecting obliquely forward, which can be attached to a fixed abutment in order to prevent rotation of the housing 10.
  • a protective cap 26 is provided which engages over the ring flanges 15 and 17 and the area 18 of the pipe section and is fastened to the housing 10.
  • the protective cap 26 has no significance for the function of the device.
  • an L-shaped block 27 is fastened in the vicinity of the ring flange 17, one leg 28 of which runs parallel to the ring flange 17 and is fastened to the torsionally elastic part 18 in the immediate vicinity of the ring flange 17.
  • the other leg 29 of the block 27 projects freely forward and covers the part 18.
  • a radially projecting switching element 30 in the form of a pin is fastened to the end wall 20 of the pipe section 16.
  • the switching element 30 projects through an elongated hole 31 of an arm 32 running approximately axially parallel to the connecting piece 16, the other end of which actuates an electrical switch 33 which is fixed to the block 27 is appropriate.
  • the arm 32 is pressed in the direction of the switch 33 by a spring 34 supported in the block 27.
  • a threaded bolt 35 runs parallel to the switch 33, the fine thread of which passes through a transverse bore of a screw 36 running at right angles to the threaded bolt 35.
  • the switch-off torque is set by turning the screw bolt 35 on a rotary knob 37.
  • the rotary knob 37 is supported on the transverse screw 36 with a spring 38 so that the adjustment is carried out without play.
  • the knob 37 By turning the knob 37, the screw 35 is advanced or withdrawn.
  • the shutdown torque is thus set.
  • the torsionally elastic pipe section 16 is fastened at one end with its ring flange 17 to the ring flange 15 of the housing 10.
  • the two ring flanges have screw holes 40.
  • the diameter of the screw holes 40 is considerably larger than the diameter of the screws which are pushed through and which are supported on the ring flange 17 with washers (not shown).
  • the screws are also not fully tightened, so that the ring flange 17 can freely adjust relative to the ring flange 15. In this way, additional material stresses are avoided and it is achieved that the cylindrical part 18 of the connecting piece 16 is subjected to a pure torsional stress.
  • the output shaft 13 of the screw device is surrounded by a sleeve 21 which has a longitudinal toothing 22.
  • a sleeve 21 which has a longitudinal toothing 22.
  • the ring 23 of the support leg 24 loosely pushed on.
  • At the end of the sleeve 21 abutting against the front end wall 50 of the housing 10 there is a further set of teeth 51 with longitudinal teeth.
  • the internal toothing of a measuring flange 52 engages in this toothing 51 and runs parallel to the end wall 50 and is movable in the axial direction.
  • the M ßflansch 52 is bent back at its outer edge 53 and carries at its outer end an internal toothing 54 which engages in an external toothing 55 of the end wall 50.
  • the measuring flange 52 can adjust freely in the axial direction relative to the end wall 50 of the housing 10 and relative to the sleeve 21, however, the sleeve 21 is coupled to the housing 10 in a rotationally elastic manner. Since the end flange 52 is torsionally elastic, it deforms when torque is transmitted.
  • strain gauges 56 On the side of the end flange 52 facing the end wall 50 there are strain gauges 56 which, according to FIG. 7, are connected together in a known manner to form a bridge circuit 57.
  • the bridge circuit 57 has feed lines 58 and signal lines 59, which are connected to a control device 60.
  • the control device 60 has a display device 61 and a setting button 62 for the cut-off torque.
  • An electrical switch 63 located in the control device 60 switches off the drive device for the screwing device when the output voltage of the bridge circuit 57 on the signal lines 59 exceeds the limit value set on the button 62.
  • the sleeve 21 loosely surrounds the output shaft 13 which rotates in it.
  • the sleeve 21 has no fixed connection to the housing 10. It is only prevented by holding means (not shown) from falling off the output shaft 13 (to the right according to FIG. 6). The rotational coupling of the sleeve 21 to the housing 10 takes place via the twistable measuring flange 52.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)
EP81104499A 1980-06-20 1981-06-11 Dispositif de vissage à détection du couple Expired EP0042548B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81104499T ATE6223T1 (de) 1980-06-20 1981-06-11 Schraubvorrichtung mit drehmomentermittlung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3023005A DE3023005C2 (de) 1980-06-20 1980-06-20 Drehschrauber mit Drehmomentbegrenzungseinrichtung
DE3023005 1980-06-20

Publications (2)

Publication Number Publication Date
EP0042548A1 true EP0042548A1 (fr) 1981-12-30
EP0042548B1 EP0042548B1 (fr) 1984-02-15

Family

ID=6104987

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81104499A Expired EP0042548B1 (fr) 1980-06-20 1981-06-11 Dispositif de vissage à détection du couple

Country Status (5)

Country Link
US (1) US4418590A (fr)
EP (1) EP0042548B1 (fr)
JP (1) JPS57114375A (fr)
AT (1) ATE6223T1 (fr)
DE (2) DE3023005C2 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0092736A1 (fr) * 1982-04-22 1983-11-02 Robert Bosch Gmbh Capteur de mesure pour le mesurage de couples et/ou d'angles de rotation, notamment sur des visseuses entraînées par un moteur
DE4307131A1 (de) * 1993-03-06 1994-09-08 Albert Kipfelsberger Kraftschrauber mit elektronischer Drehmomentbegrenzung
CN101934514A (zh) * 2010-09-29 2011-01-05 龙工（上海）挖掘机制造有限公司 一种挖掘机回转马达固定螺栓的紧固方法

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4808976A (en) * 1987-05-18 1989-02-28 Kiefers, Ltd. Torque indicator
DE4104352A1 (de) * 1991-02-13 1992-08-20 Carl Walter Schraubwerkzeug Fa Drehmomentschluessel
US5172774A (en) * 1991-04-12 1992-12-22 Ingersoll-Rand Company Axially compact torque transducer
US5501107A (en) * 1993-02-23 1996-03-26 Snyder; Robert F. Torque tool
US5738177A (en) * 1995-07-28 1998-04-14 Black & Decker Inc. Production assembly tool
US6238155B1 (en) 1995-11-06 2001-05-29 Southco, Inc. Torque screw fastener
DE19639566A1 (de) * 1996-09-26 1998-04-23 Daimler Benz Ag Einrichtung zur Ermittlung der Schraubqualität bei einem handgeführten Maschinenschraubwerkzeug
DE10217416C1 (de) * 2002-04-18 2003-07-31 Ivo Geilenbruegge Drehmomentmessvorrichtung
DE10309057B4 (de) * 2003-03-01 2007-06-06 A & M Electric Tools Gmbh Handgeführtes Arbeitsgerät mit einer einstellbaren Drehmomentbegrenzung
JP4849880B2 (ja) * 2005-12-07 2012-01-11 株式会社ハーモニック・ドライブ・システムズ 遊星歯車装置の検出機構組付け方法
US9016398B2 (en) * 2008-12-04 2015-04-28 Ingersoll-Rand Company Disc-shaped torque transducer
CN104827437B (zh) * 2012-04-11 2016-08-31 国网山东省电力公司威海市文登区供电公司 一种用于电力行业的气动扳手的定扭力装置
US20150111692A1 (en) * 2013-10-17 2015-04-23 Torq Fusion LLC Planetary gear train for use with extended length sun in high torque applications
JP2016130730A (ja) * 2015-01-07 2016-07-21 株式会社ロボテック モータシステム
DE102015103903B4 (de) * 2015-03-17 2024-04-11 Juko Technik Gmbh Kraftschrauber mit direkter Drehwinkel- und/oder Drehmomentmessung
US10357871B2 (en) 2015-04-28 2019-07-23 Milwaukee Electric Tool Corporation Precision torque screwdriver
WO2016176202A1 (fr) 2015-04-28 2016-11-03 Milwaukee Electric Tool Corporation Tournevis dynamométrique précis

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2520250A1 (de) * 1975-05-07 1976-11-18 Wagner Maschf Paul Heinz Abstuetzvorrichtung fuer getriebeschraubenschluessel
DE2637954B2 (de) * 1976-08-24 1978-11-23 Georg Robel Gmbh & Co, 8000 Muenchen Schraubmaschine für Schienenbefestigungsschrauben

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1386455A (en) * 1920-05-14 1921-08-02 Clemens Harry Barton Bolt-tightener
US1970179A (en) * 1933-02-10 1934-08-14 Charles A Miller Power wrench
US2893278A (en) * 1952-10-20 1959-07-07 Adele M Stevens Multiple stage, predetermined torque release apparatus for tightening threaded fastening elements
US3710874A (en) * 1971-03-10 1973-01-16 Ingersoll Rand Co Electronic torque measurement system
SE374506B (fr) * 1972-04-04 1975-03-10 Atlas Copco Ab
IT1036417B (it) * 1975-07-02 1979-10-30 Torino Macchine Speciali Dispositivo per l avvitamento a coppia prefissata di elementi a vite

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2520250A1 (de) * 1975-05-07 1976-11-18 Wagner Maschf Paul Heinz Abstuetzvorrichtung fuer getriebeschraubenschluessel
DE2637954B2 (de) * 1976-08-24 1978-11-23 Georg Robel Gmbh & Co, 8000 Muenchen Schraubmaschine für Schienenbefestigungsschrauben

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0092736A1 (fr) * 1982-04-22 1983-11-02 Robert Bosch Gmbh Capteur de mesure pour le mesurage de couples et/ou d'angles de rotation, notamment sur des visseuses entraînées par un moteur
DE4307131A1 (de) * 1993-03-06 1994-09-08 Albert Kipfelsberger Kraftschrauber mit elektronischer Drehmomentbegrenzung
CN101934514A (zh) * 2010-09-29 2011-01-05 龙工（上海）挖掘机制造有限公司 一种挖掘机回转马达固定螺栓的紧固方法

Also Published As

Publication number Publication date
EP0042548B1 (fr) 1984-02-15
DE3023005C2 (de) 1982-12-16
ATE6223T1 (de) 1984-03-15
JPS57114375A (en) 1982-07-16
US4418590A (en) 1983-12-06
DE3023005A1 (de) 1982-04-15
DE3162263D1 (en) 1984-03-22

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