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WO1991000989A1 - Dispositif de mesure pour la determination du couple - Google Patents

Dispositif de mesure pour la determination du couple Download PDF

Info

Publication number
WO1991000989A1
WO1991000989A1 PCT/DE1990/000464 DE9000464W WO9100989A1 WO 1991000989 A1 WO1991000989 A1 WO 1991000989A1 DE 9000464 W DE9000464 W DE 9000464W WO 9100989 A1 WO9100989 A1 WO 9100989A1
Authority
WO
WIPO (PCT)
Prior art keywords
measuring device
hollow shaft
screwdriver
shaft
sleeve
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.)
Ceased
Application number
PCT/DE1990/000464
Other languages
German (de)
English (en)
Inventor
Klaus Dobler
Hansjörg Hachtel
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of WO1991000989A1 publication Critical patent/WO1991000989A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
    • G01L3/02—Rotary-transmission dynamometers
    • G01L3/04—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft
    • G01L3/10—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving electric or magnetic means for indicating
    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
    • G01L3/02—Rotary-transmission dynamometers
    • G01L3/04—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft
    • G01L3/10—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving electric or magnetic means for indicating
    • G01L3/101—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving electric or magnetic means for indicating involving magnetic or electromagnetic means
    • G01L3/102—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving electric or magnetic means for indicating involving magnetic or electromagnetic means involving magnetostrictive means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
    • G01L3/02—Rotary-transmission dynamometers
    • G01L3/04—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft
    • G01L3/10—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving electric or magnetic means for indicating
    • G01L3/101—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving electric or magnetic means for indicating involving magnetic or electromagnetic means
    • G01L3/105—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving electric or magnetic means for indicating involving magnetic or electromagnetic means involving inductive means

Definitions

  • the invention relates to a measuring device for determining the torque according to the preamble of the main claim.
  • the torsion of a torsion shaft is determined with the aid of two concentrically arranged sleeves which are moved relative to one another.
  • the torsion shaft is arranged between an input shaft and an output shaft.
  • One of the sleeves has two rows of slots which are offset from one another and form the electrically non-conductive region.
  • continuous slits are formed in a row, also extending in the direction of the sleeve axis.
  • At least one coil through which a high-frequency alternating current flows is arranged in the region of the two rows of slots in the first sleeve.
  • the relative tangential displacement of the two sleeves from one another changes the electrically non-conductive surface of the sleeves, that is to say the opening area of the slots, as a result of which the damping of the coils is varied.
  • the measuring device has the disadvantage that additional installation space is required both for the torsion shaft itself and for its connections to the respective shafts.
  • the measuring device according to the invention with the characterizing features of claim 1 has the advantage that it has a relatively short overall length.
  • the length is limited to the torsion shaft designed as a hollow shaft.
  • the measuring device can also be used in work equipment with very limited installation space. If the measuring device is installed in screwdrivers, in particular angle screwdrivers, the size and weight of the screwdriver are changed only insignificantly.
  • the measuring device can easily be installed in the drive shaft of the screwdriver, or it can be attached to the screwdriver as an additional device.
  • FIG. 1 shows a partial longitudinal section through a screwdriver head and FIGS. 2 and 3 each show a detail of a measuring sensor.
  • 10 denotes the head of an angle screwdriver, not shown.
  • a screwdriver 12 is driven via a drive shaft 11, which is mounted in a ball bearing 13 and is fixed with a pin 14 in the housing 15 of the angle screwdriver.
  • a measuring device 17 for determining the torque when tightening is attached to the pin-like tool holder 16 of the screwdriver 12 arranged by screws.
  • the measuring device 17 has a hollow shaft 18 designed as a torsion element, which has an extension 19 at one end.
  • the extension 19 corresponds in its design to the tool holder 16 of the screwdriver 12 and thus serves to receive the screwing tool.
  • the hollow shaft 18 is attached to the screwdriver 12 with the aid of a coupling 20.
  • the coupling 20 can be welded to the hollow shaft 18, for example, or can be produced in one piece with the hollow shaft. It is important, however, that the coupling 20 projects into the interior of the hollow shaft 18. This makes it possible for the tool holder 16 of the screwdriver 12 to be located within the hollow shaft 18 and thus to extend to the base of the screwdriver 12. Since the tool holder 16 of the screwdriver 12 and the extension 19 should be of the same design, the axial length of the measuring device 17 is almost only the length of the hollow shaft 18.
  • a measuring device 17 operating according to the eddy current principle is described here, as is known, for example, from DE-OS 33 07 105.
  • other measuring methods are also possible, such as methods using strain gauges or inductive, capacitive, optical or magnetoelastic metals.
  • An inner sleeve 23 is attached at one end to the extension 19, while an outer sleeve 24 is attached on one side to the other end of the hollow shaft 18 or via the coupling 20 to the tool holder 16 of the screwdriver 12. The other end of both the inner 23 and the outer sleeve 24 is not clamped.
  • the inner sleeve 23 has two rows of longitudinal slots 25 arranged one behind the other in the axial direction.
  • the longitudinal slots 25 of the two rows are each offset by a small distance v from one another in the radial direction.
  • the outer Sleeve 24 are formed in a corresponding number and with the same slot width a as in a row of the inner sleeve 23 longitudinal slots 26 which extend in the axial direction of the sleeve 24 over the two rows of slots 25 of the inner sleeve 23.
  • a bobbin 27 designed as a sleeve over the outer sleeve 24 are in the region of the two.
  • Rows of the slots 25 of the inner sleeve 23 each wound one or more coils 28.
  • a cover 29 fastened to the screw housing 15 is arranged around the measuring device 17.
  • the mode of operation of a sensor working according to the eddy current principle is sufficiently known or can be found, for example, in the document DE-OS 33 44 385, so that it need not be discussed in more detail here.
  • the ratio of the electrically conductive and electrically non-conductive surfaces of the inner 23 and the outer sleeve 24 is changed, so that the damping of the coils 28 is changed.
  • the measurement signal obtained in this way can be evaluated in an evaluation circuit, not shown.
  • the design of the torsion shaft as a hollow shaft and, above all, the arrangement of the coupling 20 in the interior of the hollow shaft 18 enables a space-saving design, particularly in the axial direction of the measuring device 17.
  • This measuring device 17 can be used not only in the screwdrivers described here but also in other devices in which the torque must be determined.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)

Abstract

Dans le cas d'un dispositif de mesure (17) servant à la détermination du couple, l'arbre de torsion se présente sous la forme d'un arbre creux (18). En outre, l'accouplement (20) de l'arbre creux (18) est déplacé vers l'intérieur de ce dernier de façon à pouvoir gagner de la place. De cette façon, le dispositif de mesure (17) est relativement court et aussi de poids réduit. En outre il peut être conçu par exemple comme élément à fixer sur l'embout tournevis d'un tournevis coudé.
PCT/DE1990/000464 1989-07-12 1990-06-20 Dispositif de mesure pour la determination du couple Ceased WO1991000989A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP3922860.6 1989-07-12
DE19893922860 DE3922860A1 (de) 1989-07-12 1989-07-12 Messeinrichtung zur bestimmung des drehmoments

Publications (1)

Publication Number Publication Date
WO1991000989A1 true WO1991000989A1 (fr) 1991-01-24

Family

ID=6384783

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1990/000464 Ceased WO1991000989A1 (fr) 1989-07-12 1990-06-20 Dispositif de mesure pour la determination du couple

Country Status (4)

Country Link
EP (1) EP0482014A1 (fr)
JP (1) JPH04506863A (fr)
DE (1) DE3922860A1 (fr)
WO (1) WO1991000989A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19831739A1 (de) * 1998-07-15 2000-01-20 Mannesmann Vdo Ag Schneckengetriebe mit Elektromotor
WO2003082527A1 (fr) * 2002-04-02 2003-10-09 Crane Electronics Ltd Outil de detection de couple

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4413328C2 (de) * 1994-04-18 1997-03-27 Boellhoff Gmbh Drehmomentmeßeinrichtung für stationäre Schrauber
DE29607207U1 (de) * 1996-04-20 1997-08-21 Wagner, Paul-Heinz, 53804 Much Hydraulischer Kraftschrauber
US6301975B1 (en) * 1998-02-26 2001-10-16 Nsk Ltd. Torque sensor having improved reliability against thermal expansion and axial displacement of components
DE20111326U1 (de) * 2001-07-07 2001-09-27 Wagner, Paul-Heinz, 53804 Much Hydraulischer Kraftschrauber
EP1404491B1 (fr) * 2001-07-07 2011-06-08 Wagner Vermögensverwaltungs-GmbH & Co. KG Visseuse fonctionnant sous pression et pourvue d'une section de mesure

Citations (4)

* 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
US4711134A (en) * 1984-08-13 1987-12-08 Nissan Motor Co., Ltd. Torque detector
EP0285259A2 (fr) * 1987-02-27 1988-10-05 Honda Giken Kogyo Kabushiki Kaisha Capteur de couple à magnétostriction
US4785675A (en) * 1986-04-21 1988-11-22 Hitachi, Ltd. Method of and device for detecting torque

Patent Citations (4)

* 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
US4711134A (en) * 1984-08-13 1987-12-08 Nissan Motor Co., Ltd. Torque detector
US4785675A (en) * 1986-04-21 1988-11-22 Hitachi, Ltd. Method of and device for detecting torque
EP0285259A2 (fr) * 1987-02-27 1988-10-05 Honda Giken Kogyo Kabushiki Kaisha Capteur de couple à magnétostriction

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19831739A1 (de) * 1998-07-15 2000-01-20 Mannesmann Vdo Ag Schneckengetriebe mit Elektromotor
US6386056B1 (en) 1998-07-15 2002-05-14 Mannesmann Vdo Ag Worm-gear with electric motor
WO2003082527A1 (fr) * 2002-04-02 2003-10-09 Crane Electronics Ltd Outil de detection de couple
US7021180B2 (en) 2002-04-02 2006-04-04 Crane Electronics Ltd. Torque sensing tool

Also Published As

Publication number Publication date
EP0482014A1 (fr) 1992-04-29
DE3922860A1 (de) 1991-01-17
JPH04506863A (ja) 1992-11-26

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