WO1996004106A1 - Visseuse et procede de serrage de vis - Google Patents

Visseuse et procede de serrage de vis Download PDF

Info

Publication number
WO1996004106A1
WO1996004106A1 PCT/DE1995/000711 DE9500711W WO9604106A1 WO 1996004106 A1 WO1996004106 A1 WO 1996004106A1 DE 9500711 W DE9500711 W DE 9500711W WO 9604106 A1 WO9604106 A1 WO 9604106A1
Authority
WO
WIPO (PCT)
Prior art keywords
screwdriver
input shaft
speed
output shaft
drive motor
Prior art date
Application number
PCT/DE1995/000711
Other languages
German (de)
English (en)
Inventor
Gerold Mueller
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
Priority to EP95919965A priority Critical patent/EP0773854B1/fr
Priority to JP8506076A priority patent/JPH10503432A/ja
Priority to DE59507705T priority patent/DE59507705D1/de
Publication of WO1996004106A1 publication Critical patent/WO1996004106A1/fr

Links

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
    • B25B21/00—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose
    • B25B21/02—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose with means for imparting impact to screwdriver blade or nut socket
    • 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
    • B25B23/1453—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for fluid operated wrenches or screwdrivers for impact wrenches or screwdrivers

Definitions

  • the invention relates to a screwdriver according to the preamble of claim 1 and a method for tightening a screw connection according to the preamble of claim 9 or 10.
  • a screwdriver with a hydraulic pulse hammer mechanism is already known (US 4,418,764), in which the amount of effective screwing torque on the screwing tool can be determined by changing the cross section of an overflow channel by means of an adjusting screw.
  • the overflow channel is arranged between a high pressure chamber and a low pressure chamber and serves to equalize the pressure of a pressure medium.
  • the screwdriver is equipped with a mechanical switch-off device that switches off the rotary drive depending on the pressure of the pressure medium.
  • the screwdriver according to the invention with the characterizing features of claim 1 and the method according to the invention with the characterizing features of claim 9 or 10 has the advantage that a simple Structure of the screwdriver is made possible.
  • a desired tightening torque can be predefined in a simple manner, it not being necessary to change the cross section of the overflow channel.
  • a switch-off criterion for the drive motor can also be specified, so that a mechanical switch-off device is not required.
  • the present tightening torque M can be inferred in a simple manner. Together with a device for detecting the angle of rotation change ⁇ of the output shaft of the striking mechanism between successive angular pulses, a determination variable for the present screwing case (hard / soft) can then be determined.
  • a simple and precise method for tightening the screw connection can thus be specified, by means of which the required speed n of Input shaft of the hammer mechanism (target speed) can be specified depending on the respective screwing case. In this way, a high accuracy of the screwing torque of the screw connection can be achieved.
  • FIG. 1 shows a section through a handheld screwdriver designed according to the invention and
  • FIG. 2 shows a section along line II-II in FIG. 1.
  • a handheld screwdriver designated by 10 in FIG. 1 has a housing 11 in which a drive motor 12 is accommodated.
  • a drive shaft 13 of the drive motor 12 is coupled in a rotationally locking manner to an input shaft 16 of a striking mechanism 17 via a pinion 14 and a transmission gear 15.
  • the striking mechanism 17 in turn has an output shaft 18 which, with its end facing away from the striking mechanism 17, protrudes from the housing 11 of the handheld screwdriver 10 and carries a tool holder 19 there for a screwing tool (not shown).
  • the drive motor 12 is designed as an electric motor, in particular as an electronically commutated motor, and can be controlled via electrical connecting lines 20, 21.
  • the housing 11 forms a handle 23 which is oriented approximately radially away from a drive axis 22.
  • a pressure trigger 24 is accommodated in the handle 23, by means of which the drive motor 12 can be switched on and off via a switching device 25.
  • Drive motor 12 is supplied with electrical drive energy and, for this purpose, is connected to drive motor 12 or switching device 25 via electrical connecting lines (not shown).
  • the striking mechanism 17 is designed as a hydraulic impulse striking mechanism.
  • the input shaft 16 forms an approximately cylindrical rotary body 30 which is provided with an axial bore 31 for receiving the output shaft 18 and with a radial bore 32 for receiving a reciprocating piston 33.
  • the reciprocating piston 33 in turn has an axial through bore 34 through which the output shaft 18 extends.
  • a high-pressure chamber 35 and a low-pressure chamber 36 are formed within the rotating body 30 and are connected to one another via an overflow channel 37.
  • the overflow channel 37 runs inside the wall of the rotary body 30.
  • the interior of the rotary body 30 is filled with a pressure medium, for example a hydraulic oil.
  • the inside of the rotary body 30 is sealed off from the outside by a cover 38 at an opening of the radial bore 32 and by sealing means 39 on the output shaft 18.
  • the control cam 52 is designed such that the control cam 51 forces a displacement in the direction of a reduction in the volume of the high pressure chamber 35 once per complete relative rotation from the output shaft 18 to the reciprocating piston 33. This always occurs when the control cam 51 runs onto a control shoulder 53 of the control cam 52.
  • a return spring 54 By means of a return spring 54, the reciprocating piston 33 is returned to its starting position after the pulse has been delivered.
  • the pressure medium in the high pressure chamber 35 is pressurized, which leads to a momentum moment M being transmitted to the output shaft 18 via the cam control 40.
  • the magnitude of the momentum M is the pressure difference ⁇ p between the high pressure chamber 35 and the
  • the continuity equation applies to the volume flow dV / dt, i.e. the volume of the overflowing pressure medium corresponds exactly to the reduction in the volume of the high-pressure chamber 35.
  • ⁇ (t) represents the difference in the angular velocities of the input shaft 16 and the output shaft 18 and ⁇ indicates the rotational angle difference between these two shafts during the pulse output. Approximately, this angle of rotation difference ⁇ can be set equal to the angle of rotation ⁇ of the input shaft 18.
  • the named differential angular velocity ⁇ (t) then also corresponds in good approximation to the angular velocity and thus the rotational speed n of the input shaft 16. The above relationship therefore makes it clear that the volume flow dV / dt and thus the pressure difference ⁇ p (t) or the momentum M can be influenced by the differential angular velocity ⁇ (t) by the speed n of the input shaft 16.
  • Gear ratio i of the transmission gear 15 are directly related, the preselection of the speed n can be done via a corresponding control of the drive motor 12.
  • the means 27 for preselecting the speed n of the input shaft 16 have a handle 41 for setting a target speed n.
  • the handle 41 is designed, for example, as a rotary knob 47 protruding from the housing 11, which cooperates with the switching device 25 in such a way that the operator can preselect the required speed n at which the desired pulse torque M is set on the output shaft 18.
  • the switching device 25 is provided with corresponding electrical or electronic control means.
  • the handle 41 is used to specify the desired torque setpoint by identifying various switching positions of the rotary knob 47 with corresponding torque setpoints and the assignment of these torque setpoints to the corresponding speed solenoid values internally, e.g. by means of a table in a storage element.
  • Speed control device 42 which includes a transducer 43, which detects the actual speed of the input shaft 16 and forwards it via signal lines 45, 46 in signal form to a comparison device 42a of the speed control device 42. In the event of a speed deviation, the speed control device 42 adjusts the drive motor 12 accordingly, so that a stiff characteristic curve can be achieved.
  • the transducer 43 is designed as an incremental transducer which, in addition to the detection of the rotational speed n, also permits the determination of the angle of rotation ⁇ of the input shaft 16 between the successive angular pulses.
  • the input shaft 16 and the drive shaft 13 are rotationally coupled to one another during the screwing process, so that the speed n and the respective angle of rotation ⁇ of the input shaft 16 can also be determined in the illustrated arrangement of the transducer 43 on the drive shaft 13 via the transmission ratio i.
  • the start of a pulse delivery can be recognized, for example, from the speed curve n (t) by a significant drop in speed ⁇ n.
  • Speed control device 42 is assigned and which processes the signals received by the transducer 43 and transmitted via the connecting lines 45, 46.
  • the evaluation device 44 thus forms, together with the sensor 43, a device for detecting the
  • the already mentioned speed drop ⁇ n during the screwing process is also determined by means of the evaluation device 44 and used as a measure for determining the momentum moment M tapped on the tool holder 19. This is sufficiently precise, since it can be assumed that a correspondingly strong drop in speed .DELTA.n occurs with a large pulse output and vice versa.
  • the start of the pulse output is also signaled by the start of the speed drop ⁇ n, which is helpful for the aforementioned determination of the angle of rotation ⁇ of the input shaft 16 or the change in angle of rotation ⁇ of the output shaft 18.
  • the evaluation device 44 thus, together with the sensor 43, also forms a device for detecting the speed drop ⁇ n of the input shaft 16.
  • the ratio ⁇ n / ⁇ of the change in speed ⁇ n of the input shaft 16 to The change in the angle of rotation ⁇ of the output shaft 18 is determined and used as a determination variable for determining the target speed of the input shaft 16.
  • the ratio ⁇ n / ⁇ it is possible to draw conclusions about the present screwing case (hard / soft), since the speed drop ⁇ n is proportional to the momentum moment M.
  • a hard screwdriving case is characterized by a large ratio M / ⁇ , a soft screwdriving case by a small one. The same applies to the ratio ⁇ n / ⁇ .
  • the screw connection can be tightened particularly precisely to a desired torque.
  • the evaluation device 44 can be provided, for example, with a memory element in which reference variables of the ratio ⁇ n / ⁇ can be stored.
  • the determination of the change in the angle of rotation ⁇ of the output shaft 18 between successive rotary pulses by the evaluation device 44 also allows the specification of a switch-off criterion for the rotary drive.
  • a limit value ⁇ is stored in the evaluation device 44, which indicates a minimal change in the angle of rotation ⁇ of the output shaft 18 between successive angular pulses. If this limit value ⁇ is reached in the course of the screwing process, ie if ⁇ ⁇ ⁇ , the screwing torque of the screw connection due to successive angular momentum is no longer significant increases and the evaluation device 44 switches off the drive motor 12 accordingly.
  • the invention is not limited to the exemplary embodiment described.
  • the screwdriver can also be equipped with any other hydraulic pulse hammer mechanism, for example the multi-blade hammer mechanism known from US 4,418,764.
  • a transmission gear between the drive motor and the striking mechanism is not always necessary, depending on the motor type. This also applies to the speed control device.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)

Abstract

Une visseuse comprend un mécanisme hydraulique de percussion (17) pourvu d'un arbre d'entrée (16) susceptible d'être mis en rotation par un moteur d'entraînement (12) et d'un arbre de sortie (18) couplé à un outil de vissage. Le mécanisme de percussion (17) comprend en outre une chambre de haute pression (35) et une chambre de basse pression (36) remplies d'un fluide sous pression et en communication l'une avec l'autre par l'intermédiaire d'un conduit de trop-plein (37). Le conduit de trop-plein (37) a une section transversale d'écoulement constante. Un moment angulaire cinétique (M) exploitable au niveau de l'arbre de sortie (18) est généré par modification de la vitesse de rotation (n) de l'arbre d'entrée (16). La visseuse (10) comprend à cet effet des moyens (27) de présélection de la vitesse de rotation (n) de l'arbre de rotation (16) ou du moment angulaire cinétique (M) au niveau de l'arbre de sortie (18).
PCT/DE1995/000711 1994-08-03 1995-06-01 Visseuse et procede de serrage de vis WO1996004106A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP95919965A EP0773854B1 (fr) 1994-08-03 1995-06-01 Visseuse et procede de serrage de vis
JP8506076A JPH10503432A (ja) 1994-08-03 1995-06-01 ねじ回し機械及びねじ回し機械によりねじ結合を締付けるための方法
DE59507705T DE59507705D1 (de) 1994-08-03 1995-06-01 Schrauber und verfahren zum anziehen einer schraubverbindung mittels des schraubers

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4427452A DE4427452A1 (de) 1994-08-03 1994-08-03 Schrauber und Verfahren zum Anziehen einer Schraubverbindung mittels des Schraubers
DEP4427452.1 1994-08-03

Publications (1)

Publication Number Publication Date
WO1996004106A1 true WO1996004106A1 (fr) 1996-02-15

Family

ID=6524820

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1995/000711 WO1996004106A1 (fr) 1994-08-03 1995-06-01 Visseuse et procede de serrage de vis

Country Status (4)

Country Link
EP (1) EP0773854B1 (fr)
JP (1) JPH10503432A (fr)
DE (2) DE4427452A1 (fr)
WO (1) WO1996004106A1 (fr)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001205575A (ja) * 2000-01-28 2001-07-31 Nitto Kohki Co Ltd トルク制御式インパクトレンチ
JP3361794B2 (ja) * 2000-08-11 2003-01-07 瓜生製作株式会社 油圧式トルクレンチの打撃トルク発生装置
EP1493134B1 (fr) * 2002-04-11 2019-06-19 Sensormatic Electronics, LLC Systeme et procede permettant d'optimiser la plage de fonctionnement d'un systeme electronique de surveillance d'articles
US7552781B2 (en) 2004-10-20 2009-06-30 Black & Decker Inc. Power tool anti-kickback system with rotational rate sensor
DE102005056264A1 (de) * 2005-11-14 2007-05-16 Fein C & E Gmbh Schrauber mit Drehzahlregelung und Verfahren zur Drehzahlregelung eines Schraubers
DE102007045695A1 (de) * 2007-09-24 2009-04-02 Hs-Technik Gmbh Hydropneumatischer Impulsschrauber und Verfahren zur Steuerung eines hydropneumatischen Impulsschraubers
US9475180B2 (en) 2010-01-07 2016-10-25 Black & Decker Inc. Power tool having rotary input control
US9266178B2 (en) 2010-01-07 2016-02-23 Black & Decker Inc. Power tool having rotary input control
AU2011204260A1 (en) 2010-01-07 2012-06-07 Black & Decker Inc. Power screwdriver having rotary input control
US8418778B2 (en) 2010-01-07 2013-04-16 Black & Decker Inc. Power screwdriver having rotary input control
DE102010063080A1 (de) * 2010-12-14 2012-06-14 Robert Bosch Gmbh Handwerkzeugmaschine mit einem mechanischen Schlagwerk
EP2631035B1 (fr) 2012-02-24 2019-10-16 Black & Decker Inc. Outil électrique
JP5403110B2 (ja) * 2012-06-04 2014-01-29 マックス株式会社 打撃工具
US10589413B2 (en) 2016-06-20 2020-03-17 Black & Decker Inc. Power tool with anti-kickback control system
CN110621444B (zh) * 2017-05-16 2021-06-15 阿特拉斯·科普柯工业技术公司 液压脉冲扳手的油位警告方法及系统
DE102021204317A1 (de) * 2021-04-29 2022-11-03 Hagn, k.s. Verbundwerkzeug

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4110829A (en) * 1974-09-19 1978-08-29 Standard Pressed Steel Co. Apparatus for and method of determining rotational and linear stiffness
DE3103286A1 (de) * 1981-01-31 1982-08-12 Kress-elektrik GmbH & Co, Elektromotorenfabrik, 7457 Bisingen Elektrohandwerkzeugmaschine zum schrauben, bohren und eventuell schlagbohren
US4358735A (en) * 1977-07-25 1982-11-09 Sps Technologies, Inc. Bidirectional incremental encoding system for measuring maximum forward angular displacement of a bidirectionally rotatable rotating shaft
US4418764A (en) * 1981-07-14 1983-12-06 Giken Kogyo Kabushiki Kaisha Fluid impulse torque tool
US4609089A (en) * 1982-12-27 1986-09-02 Kabushiki Kaisha Kuken Impact wrench for tightening to a desired level
EP0203370A1 (fr) * 1985-05-30 1986-12-03 Robert Bosch Gmbh Dispositif à visser avec tournevis entraîné par un moteur
US5014793A (en) * 1989-04-10 1991-05-14 Measurement Specialties, Inc. Variable speed DC motor controller apparatus particularly adapted for control of portable-power tools

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4110829A (en) * 1974-09-19 1978-08-29 Standard Pressed Steel Co. Apparatus for and method of determining rotational and linear stiffness
US4358735A (en) * 1977-07-25 1982-11-09 Sps Technologies, Inc. Bidirectional incremental encoding system for measuring maximum forward angular displacement of a bidirectionally rotatable rotating shaft
DE3103286A1 (de) * 1981-01-31 1982-08-12 Kress-elektrik GmbH & Co, Elektromotorenfabrik, 7457 Bisingen Elektrohandwerkzeugmaschine zum schrauben, bohren und eventuell schlagbohren
US4418764A (en) * 1981-07-14 1983-12-06 Giken Kogyo Kabushiki Kaisha Fluid impulse torque tool
US4609089A (en) * 1982-12-27 1986-09-02 Kabushiki Kaisha Kuken Impact wrench for tightening to a desired level
EP0203370A1 (fr) * 1985-05-30 1986-12-03 Robert Bosch Gmbh Dispositif à visser avec tournevis entraîné par un moteur
US5014793A (en) * 1989-04-10 1991-05-14 Measurement Specialties, Inc. Variable speed DC motor controller apparatus particularly adapted for control of portable-power tools

Also Published As

Publication number Publication date
EP0773854A1 (fr) 1997-05-21
JPH10503432A (ja) 1998-03-31
DE59507705D1 (de) 2000-03-02
DE4427452A1 (de) 1996-02-08
EP0773854B1 (fr) 2000-01-26

Similar Documents

Publication Publication Date Title
EP0773854A1 (fr) Visseuse et procede de serrage de vis
EP0182986B1 (fr) Dispositif de serrage actionné par moteur avec réglage du couple variable
EP2140976B1 (fr) Vis autotaraudeuse à frapper
DE102007000281A1 (de) Verfahren zur Steuerung eines Schraubgerätes
DE19609986A1 (de) Verfahren und Schaltungsanordnung zum Betrieb eines Elektromotors
DE102009000129A1 (de) Verfahren zum Einstellen einer Elektrowerkzeugmaschine
EP2140978B1 (fr) Vis autotaraudeuse à frapper
EP1785231A2 (fr) Outil de vissage à régulation de vitesse de rotation et méthode de régulation de vitesse pour un outil de vissage
EP2305434B1 (fr) Machine-outil électrique
EP1170093B1 (fr) Outil de vissage
DE202015105674U1 (de) Elektrowerkzeug
DE10014314B4 (de) Verfahren und Einrichtung für handgeführte Werkzeugmaschinen zur optimierten Bearbeitung verschiedener Untergründe durch Energieanpassung
WO2021094146A1 (fr) Procédé permettant de commander et de régler une machine-outil
DE2920065A1 (de) Motorisch angetriebene handwerkzeugmaschine zum bohren, schlagbohren und schrauben
DE102007045695A1 (de) Hydropneumatischer Impulsschrauber und Verfahren zur Steuerung eines hydropneumatischen Impulsschraubers
DE3440920A1 (de) Einrichtung zur drehzahlregelung
WO2002064345A1 (fr) Procede de regulation d'assistance hydraulique d'une commande electrique
EP4377049A1 (fr) Procédé de commande en boucle ouverte et en boucle fermée d'une machine-outil
WO2021094152A1 (fr) Procédé de commande et de régulation d'une machine-outil et poignée pour machine-outil
EP2921263A1 (fr) Reconnaissance de comportement au choc en fonction de la charge
EP0292752A2 (fr) Clé à impulsion hydraulique
WO2019145156A1 (fr) Procédé de commande d'une visseuse à percussion
DE19506663C2 (de) Impulsschrauber
DE10216527A1 (de) Einrichtung zur Drehmomentbegrenzung eines Werkzeugs und Verfahren zu deren Betrieb
DE2612207A1 (de) Elektrowerkzeug mit vom drehmoment abhaengiger drehzahlregelung

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): JP US

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FR GB GR IE IT LU MC NL PT SE

DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
121 Ep: the epo has been informed by wipo that ep was designated in this application
WWE Wipo information: entry into national phase

Ref document number: 1995919965

Country of ref document: EP

ENP Entry into the national phase

Ref country code: US

Ref document number: 1997 793062

Date of ref document: 19970203

Kind code of ref document: A

Format of ref document f/p: F

WWP Wipo information: published in national office

Ref document number: 1995919965

Country of ref document: EP

WWG Wipo information: grant in national office

Ref document number: 1995919965

Country of ref document: EP