EP0904178B1 - Cle a chocs hydraulique - Google Patents

Cle a chocs hydraulique Download PDF

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Publication number
EP0904178B1
EP0904178B1 EP97921658A EP97921658A EP0904178B1 EP 0904178 B1 EP0904178 B1 EP 0904178B1 EP 97921658 A EP97921658 A EP 97921658A EP 97921658 A EP97921658 A EP 97921658A EP 0904178 B1 EP0904178 B1 EP 0904178B1
Authority
EP
European Patent Office
Prior art keywords
power wrench
shaft
measuring
hydraulic power
torsion sensor
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.)
Expired - Lifetime
Application number
EP97921658A
Other languages
German (de)
English (en)
Other versions
EP0904178A1 (fr
Inventor
Joachim Hauenstein
Klaus Rüssmann
Thomas Beyert
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 Vermoegensverwaltungs GmbH and Co KG
Original Assignee
Hauenstein Joachim
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 Hauenstein Joachim, Wagner Paul-Heinz filed Critical Hauenstein Joachim
Publication of EP0904178A1 publication Critical patent/EP0904178A1/fr
Application granted granted Critical
Publication of EP0904178B1 publication Critical patent/EP0904178B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B25B21/00—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose
    • B25B21/004—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose of the ratchet type
    • B25B21/005—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose of the ratchet type driven by a radially acting hydraulic or pneumatic piston
    • 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
    • B25B23/0078—Reaction arms
    • 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 hydraulic power wrench.
  • the reliability of a screw connection depends crucially from the fact that when tightening the screw connection a tightening torque specified by the design complied with, i.e. reached and within the permissible tolerance is not exceeded.
  • Such power screwdrivers (DE 41 11 631 A1) have a reciprocating piston that is slidable in a cylinder space of a drive part is arranged.
  • This piston drives via a ratchet lever a ring piece, which has a plug-in shaft a torque on the screw connection transmits.
  • a torque is set for such hydraulic power wrenches so far on the setting the pressure of the hydraulic oil on the working piston of the oscillating power wrench works.
  • the pressure of the hydraulic oil is only a measure of the force under a changing Angle on the ratchet lever of the hydraulic power wrench is exercised.
  • the tightening torque depends but not only from the pressure of the hydraulic oil in the Cylinder chamber of the power wrench, but also from the type of support for the power wrench. For this Tables have been used for this reason, from which a Tightening torque for a given hydraulic pressure and one given support geometry was apparent.
  • it is impossible for all possible support variants of the hydraulic power wrench in advance calculations and to document them in a table is this well-known method of investigation the tightening torque not only cumbersome, but with unknown support conditions also imprecise.
  • the object of the invention is to comply a predetermined tightening torque during manufacture a screw connection with a hydraulic Power wrench by a reciprocating piston is driven to facilitate.
  • the torque not to be determined retrospectively or indirectly, but immediately and immediately on the screw or nut measure up.
  • the shaft as a measuring shaft with one of the tool holder adjacent measuring section is formed, which is arranged on the protruding from the housing front portion of the measuring shaft.
  • a torsion of the measuring shaft occurring in this measuring section is by a torsion sensor arranged in the measuring section detected. Because the torsion (twist) is a measure for the torque at this point, you can use the Measuring shaft the tightening torque directly on the screw connection be determined. With the monitoring of Torsion or the torque can then be the tightening torque adhere safely.
  • An essential advantage of the invention results from that to determine the tightening torque required components have no influence on the structure the power wrench for the rest, i.e. on the Drive and functional part.
  • the measuring device is only arranged on or in the measuring shaft.
  • the advantages of the invention can also be shared with achieve an old hydraulic power wrench if this modified by the use of a measuring shaft has been.
  • the fact that the hydraulic power wrench No modifications required except on the measuring shaft can use sophisticated constructions known power wrench unchanged are guaranteed, which ensures high operational reliability becomes.
  • the pluggability of the shaft also has the advantage that if the measuring section or the Torsion sensor by simply changing the measuring shaft a quick repair of the hydraulic power wrench is possible. It also makes it easier to plug in calibration of the torsion sensor with the measuring shaft removed.
  • the torsion sensor preferably a signal output on the on the opposite of the tool holder End of the shaft is arranged.
  • a signal output on the on the opposite of the tool holder End of the shaft is arranged.
  • the housing of the hydraulic Power wrench between the signal output and the Tool holder and thereby shields the Signal output from.
  • the hydraulic power wrench remains with one such design of the hydraulic power wrench in the area of the tool free from attachments that are under The applicability of the hydraulic power wrench would hinder a screw connection.
  • the measuring shaft is preferably designed such that all necessary for energy and / or signal transmission Torsion sensor connections without contact to the rotating shaft or the rotating part the wave are guided. Sliding contacts prone to errors can be avoided.
  • the invention hydraulic power wrench together with a hydraulic pump unit contains a control device at which a target torque is adjustable, the control device signals of the torsion sensor of the measuring shaft receives and the feed from hydraulic oil to the power wrench upon receipt interrupts a signal corresponding to the target torque. Since the torsion (torsion) with that in the measuring section prevailing torque over known material and geometry sizes is coupled, can be from the torsion on the one hand without problems the prevailing Determine torque and just as easily from a target torque a target torsion. As a result of that the hydraulic pump unit the pressure medium supply upon receipt of a signal corresponding to the target torque automatically interrupts, an overdrawing of the Screw connection securely prevented, in particular human error is excluded.
  • the signals from the measuring shaft can also Pump unit can be simplified.
  • On the pump set can in particular a pressure adjustment valve and Manometer can be saved.
  • the pump set needs can only be switched on and off and can always remain set to maximum pressure. Only a pressure relief valve is still for safety reasons required.
  • hydraulic Power screwdriver alternatively or in addition to the connection to a hydraulic pump unit to an evaluation unit can be connected.
  • an evaluation device for example, a battery-powered torque indicator pocket-sized, or a data processing system for assembly control with a measurement log printer, allow that in the manufacture a screw connection with high moments Determine accuracy and document if necessary.
  • the in Figs. 1-3 shown hydraulic power wrenches 10 according to the first embodiment has a one-piece Housing 12 in which a drive part 14th and a functional part 16 are included.
  • the drive part 14 has an axially displaceable in a cylinder space 18
  • Piston 20 on a piston rod 22 drives a ratchet lever 24.
  • the ratchet lever 24 has a spring-loaded ratchet element (not shown) on that one at the piston rod articulation end of the ratchet lever 24 opposite end Ring piece 26 during a working stroke of the piston 20 takes along.
  • the ring piece 26 has one for receiving one in the hydraulic Power screwdriver 10 insertable measuring shaft 30 an insertion channel provided with internal teeth 28 on which is coaxial with one across the housing 12 extending insertion opening 28 for a measuring shaft 30 runs.
  • the measuring shaft 30 has a square at one end as a workpiece holder 32.
  • the tool holder 32 is used to hold an attachable Socket (not shown).
  • Around the measuring shaft 32 in the housing 12 of the hydraulic power wrench 10 to be stored are a first bearing section on the measuring shaft 30 34 and a second bearing section 36 are formed, the part of a plain bearing for the measuring shaft 30th are.
  • the measuring shaft 30 has a toothed section 38 with one of the splines of the ring piece 26 complementary serration.
  • This Tooth portion 38 becomes one of the piston 20 exerted on the ratchet lever 24 via the piston rod 22 Force as a moment to the tool holder 32 transferred and from there to be put on Transfer screw connection.
  • the measuring shaft has the ability to determine the tightening torque 30 on the front section protruding from the housing 12, the tool holding device 32 directly adjacent, a measuring section 40, in which for Determination of the torsion of the measuring shaft 30 as a torsion sensor 41 arranged several strain gauges 42 (Fig. 3) are.
  • the measuring shaft 30 has a flat annular groove 44 which then a measuring shaft collar 46 for support the measuring shaft 30 on the housing 12 over almost extends the entire length of the measuring section 40.
  • the Strain gauges 42 are used to determine the torque at 45 ° to the longitudinal axis of the measuring shaft 30 in the Annular groove 44 glued to the measuring shaft 30 and with a Pour sealing compound 48 so that the strain gauges become detached 42 due to moisture or mechanical Environmental influences is prevented.
  • a sleeve 50 completely covering the annular groove is provided, the plane in the radial direction with the measuring shaft collar 46 completes.
  • the connector turns 62 with the tool holding device in this embodiment 32 with and thus twists the connection cable 66; however, such a twist is acceptable since generally until the tightening torque is reached only a few revolutions of the measuring shaft.
  • the simple and robust design of the connection is a big advantage.
  • the hydraulic power wrench 110 according to the second Embodiment differs from that hydraulic power wrench 10 according to the first embodiment only in terms of design the measuring shaft 130. For this reason, the Power wrench 110 according to the second embodiment Reference numerals used opposite the reference numerals in the power wrench 10 according to the first embodiment are increased by "100". On the description these parts in connection with the first embodiment is referred to.
  • the hydraulic power wrench 110 according to the second Embodiment has compared to the hydraulic power wrench 10 according to the first embodiment has the advantage that the plug 162 for connecting the measuring shaft 130 to an evaluation unit opposite the tool holder 132 is freely rotatable, i.e. when screwing not turning.
  • the measuring shaft 130 has a carrier projection 180, that on the opposite of the tool holder 32 Side of the power wrench 110 from the Housing 112 protrudes and for storage of a rotating cap 182 is equipped with a storage device.
  • this bearing device consists of two axially spaced apart ball bearings 184,186.
  • the Ball bearings 184,186 ensure free rotation the rotary cap 182 around the carrier protrusion 180.
  • the rotary cap 182 In order to supply the torsion sensor 141 with energy, the rotary cap 182 has an electronics unit 188, which extend in a coaxial manner to the rotary cap 182, delimited by a container wall 190 Chamber 192 is located.
  • the container wall 190 of the chamber 192 plunges into a carrier projection 180, Transmission chamber running coaxially to the measuring shaft 130 194 a.
  • the electronics unit 188 that is provided by the connector 162 is supplied with 9 V direct current, converts the direct current into high frequency energy (60 kHz), which has a High-frequency line 196 of a first coil 198 (primary coil) is fed.
  • the primary coil 198 is coaxial arranged to the measuring shaft in the rotary cap 182 and with this rotatably connected. Radially within the first Coil 198 (primary coil) is released with one
  • a second coil 200 (secondary coil) is provided, which is connected to measuring electronics 202 and together with the primary coil 198 a transformer forms.
  • the measuring electronics 202 is arranged in a rotating space 204 which is delimited in the axial direction by the ball bearing 184 and the primary and secondary coils 198, 200 and in the radial direction by the carrier projection 180 and the rotating cap 182.
  • an annular holding cup 210 made of non-magnetic material, e.g. aluminum, is provided, the inner radial wall 206 of which also fixes the ball bearing 184 on the carrier projection 180, acts as a support surface for the secondary coil 200 and defines the distance between the first ball bearing 184 and the second ball bearing 186.
  • the outer wall 208 of the holding cup 210 serving to protect the measuring electronics 202 is connected to the inner wall 206 via a radial web.
  • the holding cup 210 is open on one side in the axial direction prior to its mounting, the measuring electronics 202 preferably being cast in the holding cup 210.
  • the measuring electronics 202 supplies the strain gauges 142 with energy and on the other hand receives from the strain gauges 142 via a signal line 214 measurement signals that are converted into a high-frequency, frequency-modulated Signal to be converted and through a diode line 216 to an optical transmitter 218 (infrared transmitter) be transmitted.
  • the transmitter 218 transmits the frequency modulated signals at a carrier frequency of about 8 kHz +/- 2 kHz are modulated into one Receiver 220, which, like the transmitter 218, is on the axis of the Measuring shaft 130 is arranged and at the front end the container wall formed on the rotary cap 182 190 is located.
  • the diameter of the rotary cap 182 shown in FIG. 4 is smaller than that of the internal toothing of the ring piece. Therefore, the measuring shaft 130 through the housing 112 of the Power wrench inserted.
  • the measuring shaft but can also be made divisible, so that a Rotating cap in such an embodiment only after Push the rotating part of the measuring shaft through the housing 112 is plugged onto the rotating part.
  • Such a rotary cap then preferably also serves axial fixation of the measuring shaft.
  • Power wrench 10 are used in that initially after attaching a socket, the power wrench 10 is attached to the screw connection. Subsequently becomes a support leg 72 of the power wrench on the housing 12 by moving it into a favorable support position brought. By switching on a hydraulic pump unit 74 the power wrench 10 is then supplied with pressure oil via a flexible hydraulic line 76. The pressure oil supply causes the measuring shaft 30th is turned and thus the screw connection is tightened. The prevailing at the screw connection during tightening Torque can be read on the evaluation unit 68 become.
  • the evaluation unit is preferably such designed to supply hydraulic oil to the power wrench 10 upon receipt of a target torque Signals from the torsion sensor 41 automatically is interrupted.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
  • Lubricants (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)

Claims (9)

  1. Clé dynamométrique hydraulique comprenant une partie d'entraínement (14), dans laquelle se déplace un piston (20), et une partie fonctionnelle (16) montée dans un boítier (12 ; 112), laquelle partie comporte un levier à cliquet (24) actionné par la partie d'entraínement (14), et actionne, par l'intermédiaire du levier à cliquet (24), un arbre inséré de manière amovible dans le boítier (12 ; 112) et monté de manière à pouvoir tourner, dont une des extrémités est munie d'un dispositif de réception d'outil (32 ; 132), caractérisée en ce que l'arbre est conçu sous forme d'arbre de mesure (30 ; 130) muni d'un tronçon de mesure (40 ; 140) contigu au dispositif de réception d'outil (32 ; 132) et comporte un capteur de torsion (41 ; 141) disposé dans le tronçon de mesure (40 ; 140), le tronçon de mesure (40 ; 140) étant disposé sur la partie avant de l'arbre de mesure (30 ; 130) qui fait saillie hors du boítier (12 ; 112).
  2. Clé dynamométrique hydraulique selon la revendication 1, caractérisée en ce que le capteur de torsion (41 ; 141) comporte une sortie de signaux, qui est disposée sur l'extrémité de l'arbre opposée au dispositif de réception d'outil (32 ; 132).
  3. Clé dynamométrique hydraulique selon la revendication 2, caractérisée en ce que la sortie de signaux du capteur de torsion (41) est reliée à un connecteur (62), qui est disposé sur l'arbre de mesure (30) de manière à tourner avec le dispositif de réception d'outil (32).
  4. Clé dynamométrique hydraulique selon la revendication 2, caractérisée en ce que la sortie de signaux du capteur de torsion (141) est reliée à un connecteur (162), qui est disposé sur une calotte rotative (180) logée de manière à pouvoir tourner librement par rapport au dispositif de réception d'outil (132) de l'arbre de mesure (130).
  5. Clé dynamométrique hydraulique selon la revendication 4, caractérisée en ce que le connecteur (162) peut être raccordé à une source de courant extérieure et est relié à un transformateur, qui est disposé à l'intérieur de la calotte rotative (180), dont la bobine primaire (198) est disposée contre la calotte rotative (180) de manière à être liée en rotation avec celle-ci et dont la bobine secondaire (200) est disposée de manière à être liée en rotation avec le dispositif de réception d'outil (132).
  6. Clé dynamométrique hydraulique selon la revendication 4 ou 5, caractérisée en ce qu'un dispositif électronique de mesure (202) transforme les signaux du capteur de torsion (141) en signaux à fréquence modulée, qui sont transmis par un émetteur (218), qui tourne avec le dispositif de réception d'outil (132) de l'arbre de mesure (130), vers un récepteur (220) disposé sur la calotte rotative (180) de manière à être lié en rotation avec celle-ci.
  7. Clé dynamométrique hydraulique selon l'une quelconque des revendications 1 à 6, caractérisée par un dispositif de commande, sur lequel il est possible de réguler un moment de consigne et qui reçoit les signaux émis par le capteur de torsion (41 ; 141) de l'arbre de mesure (30 ; 130) et qui, à la réception d'un signal correspondant au moment de consigne, déconnecte le groupe de pompe qui alimente la clé dynamométrique.
  8. Clé dynamométrique hydraulique selon l'une quelconque des revendications 2 à 7, caractérisée en ce que la sortie de signaux est disposée sur le tronçon arrière de l'arbre qui fait saillie hors du boítier (12 ; 112).
  9. Clé dynamométrique hydraulique selon l'une quelconque des revendications 1 à 8, caractérisée en ce qu'un manchon (50 ; 150) protégeant le capteur de torsion (41 ; 141) est logé sur le tronçon de mesure (40 ; 140).
EP97921658A 1996-04-20 1997-04-18 Cle a chocs hydraulique Expired - Lifetime EP0904178B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE29607207U 1996-04-20
DE29607207U DE29607207U1 (de) 1996-04-20 1996-04-20 Hydraulischer Kraftschrauber
PCT/EP1997/001949 WO1997039857A1 (fr) 1996-04-20 1997-04-18 Cle a chocs hydraulique

Publications (2)

Publication Number Publication Date
EP0904178A1 EP0904178A1 (fr) 1999-03-31
EP0904178B1 true EP0904178B1 (fr) 2001-08-29

Family

ID=8022879

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97921658A Expired - Lifetime EP0904178B1 (fr) 1996-04-20 1997-04-18 Cle a chocs hydraulique

Country Status (3)

Country Link
EP (1) EP0904178B1 (fr)
DE (2) DE29607207U1 (fr)
WO (1) WO1997039857A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101730839B (zh) * 2007-07-13 2012-12-05 阿特拉斯科普科工具公司 用于动力工具的调节器

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WO2002085568A1 (fr) * 2001-04-20 2002-10-31 Paul-Heinz Wagner Tournevis pneumatique
DE20111326U1 (de) * 2001-07-07 2001-09-27 Wagner Paul Heinz Hydraulischer Kraftschrauber
WO2003006208A1 (fr) * 2001-07-07 2003-01-23 Paul-Heinz Wagner Visseuse fonctionnant sous pression et pourvue d'une section de mesure
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KR102332079B1 (ko) 2013-12-27 2021-11-26 아틀라스 콥코 인더스트리얼 테크니크 에이비 전동 공구
KR102414904B1 (ko) * 2020-04-17 2022-07-01 (주)볼팅마스타 유압 토크 렌치

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101730839B (zh) * 2007-07-13 2012-12-05 阿特拉斯科普科工具公司 用于动力工具的调节器

Also Published As

Publication number Publication date
WO1997039857A1 (fr) 1997-10-30
DE29607207U1 (de) 1997-08-21
DE59704463D1 (de) 2001-10-04
EP0904178A1 (fr) 1999-03-31

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