EP2114623B1 - Screwing tool - Google Patents

Screwing tool Download PDF

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Publication number
EP2114623B1
EP2114623B1 EP08802589A EP08802589A EP2114623B1 EP 2114623 B1 EP2114623 B1 EP 2114623B1 EP 08802589 A EP08802589 A EP 08802589A EP 08802589 A EP08802589 A EP 08802589A EP 2114623 B1 EP2114623 B1 EP 2114623B1
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EP
European Patent Office
Prior art keywords
screwing tool
output shaft
clutch
tool according
screwing
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.)
Active
Application number
EP08802589A
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German (de)
French (fr)
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EP2114623A1 (en
Inventor
Klaus Grohmann
Lothar Thommes
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.)
Tesla Automation GmbH
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Grohmann Engineering GmbH
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Publication of EP2114623A1 publication Critical patent/EP2114623A1/en
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    • 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
    • B25B23/141—Mechanical overload release couplings
    • 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
    • B25B21/002—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose for special purposes

Definitions

  • the invention relates to a screwing tool according to the preamble of claim 1.
  • Such a screwing tool is for example from the DE-A-19527115 known.
  • replaceable screwdriver tips also referred to as bits
  • the screwdriver tips are adapted to different shapes of screw heads, in particular slotted screws, cross-slotted screws, hexagon socket screws and Torx screws.
  • Such screwing tools are used, inter alia, in the form of the widely used cordless screwdrivers with which can be fastened together with little effort and quickly components without damaging the screw head.
  • adjusting clamp elements must be mounted on the vehicle, which consist of a hollow cylindrical sleeve and an extending through the hollow cylinder inner screw.
  • These adjustable clamp elements are currently mounted with two different screwdrivers.
  • an annular screwing tool for detecting the drive profiles on the lateral surface of the sleeve used, while the inner screw is screwed with a screwing, the screwdriver tip engages the front side into the screw head.
  • the invention is based on the object to provide a screwing tool of the type mentioned, with which attach different connecting elements, in particular adjusting clamping elements consisting of a screw-sleeve and an internal screw with only one screwing to let.
  • Another object of the invention is to be able to attract the different fasteners with different torques.
  • the axial displaceability of the receiving part allows a relative movement between the rotatably mounted on the receiving part annular screwing tool and the front side arranged on the output shaft screwdriver tip, so that either the annular screwing tool or the screwdriver tip is used.
  • the screwdriver tip must be in the axial direction of the Output shaft acting force are pressed against the screw head.
  • the receiving part moves against the force of the return element in the direction of the axis of the output shaft away from the screwdriver tip, so that they can detect the screw head of the inner screw.
  • At least one switchable coupling is arranged, which separates or connects the power flow between the output shaft and the annular screwing tool.
  • the switchable coupling is preferably non-positively and self-switching, in particular designed as a slip clutch, which separates the power flow between the output shaft and the annular screw when reaching the tightening torque.
  • the design of the slip clutch, the tightening torque of the annular screwing can be determined.
  • the slip clutch is preferably designed as a multi-plate clutch. In principle, however, other types come into consideration.
  • the non-positive, self-switching running slip clutch in addition to the non-positive, self-switching running slip clutch is a foreign-connected and form-fitting executed coupling between the rotatably mounted annular screw and the output shaft.
  • the circuit of this positively designed coupling is preferably effected in that the power flow between the output shaft connected to the first clutch element of the slip clutch and the output shaft is separated by an axial displacement of the first coupling element along the axis of the output shaft.
  • This axial displacement of the first coupling element is supported by the fact that the first coupling element is acted upon by the force of a spring, which is arranged between the first coupling element and the annular screwing tool.
  • the torque of the slip clutch determining spring force acts in the direction of the second coupling element.
  • the axial displacement of the receiving part which is in any case required for the use of the screwdriver tip, simultaneously causes an axial displacement of the first coupling element of the slip clutch along the axis of the output shaft in a region of the output shaft in which the positive locking contours of the additional clutch are disengaged.
  • the additional clutch prevents torque being applied to the annular wrenching tool from the decoupled output shaft during use of the screwdriver tip of the wrenching tool.
  • this torque freedom is not absolutely necessary, since the slip clutch effectively prevents exceeding the tightening torque of the detected by the annular screwing fastener due to design.
  • the preferably sleeve-shaped receiving part for the rotatable mounting of the annular screwing tool is in particular guided against rotation to the housing of the screwing tool in the axial direction of the output shaft.
  • the rotation is effected for example by means of a feather key.
  • means for temporarily locking the annular screwing tool are arranged on the receiving part.
  • the means for locking come preferably by the axial movement of the receiving part automatically engaged when the receiving part is moved in the direction of the housing of the screwing.
  • the screwing tool comprises a conventional screwdriver (100) with a in an in FIG. 1 only partially shown housing (101) arranged electric drive, which is connected to an output shaft (200). Between the electric drive of the screwdriver (100) and the output shaft (200), which is not shown, a mechanical or electronic torque shut-off clutch is usually arranged which, when a desired tightening torque is reached, separates the power flow between the electric drive and the output shaft (200).
  • the screwdriver tip (201) is formed in the illustrated embodiment as a Torx screwdriver tip in the form of a six-pointed star.
  • the screwdriver tip (201) can be inserted into the head (300) of an internal screw (301) on the face side.
  • the inner screw (301) is part of a so-called adjustable-clamping element (302), which is used for assembly purposes in the automotive industry.
  • the inner screw (301) by a hollow cylindrical sleeve (303) is surrounded.
  • the sleeve (303) has on its lateral surface (304) drive contours (305) which can be set in rotation by an annular screwing tool (400).
  • an annular screwing tool (400) Between the sleeve (303) and the inner screw (301) of the adjusting-clamping element (302), a the inner screw (301) surrounding the elastic ring (306) is arranged.
  • the screwdriver (100) additionally has the annular screwing tool (400), which is rotatably mounted on a receiving part (500), but non-rotatably in the direction of the axis (202) of the output shaft (200) is displaceably guided.
  • the annular screwing tool (400) has an annular profile (401) which cooperates with the drive contours (305) of the sleeve (303).
  • a shoulder (402) which serves as a stop on the front side of the sleeve (303) and on the other hand as an abutment for a spring (601) on the coupling arrangement (600 ) acts.
  • the spring (601) is designed in the illustrated embodiment as a spiral spring.
  • the annular screwing tool (400) has a bearing shell (403), which in the exemplary embodiment shown is releasably connected to a threaded sleeve (404).
  • the bearing shell (403) and the screw sleeve (404) can also be made in one piece.
  • the receiving part (500) is formed by a sliding sleeve (501) which concentrically surrounds a hollow cylindrical clamping ring (502).
  • the clamping ring (502) is at its the Housing (101) of the screwdriver (100) facing the end face with a clamping device (503), which allows a rotationally fixed clamping connection with the housing (101).
  • This simple clamp connection allows easy retrofitting of conventional screwdrivers (100) with the components essential to the invention (400, 500, 600).
  • the sliding sleeve (501) is about the displacement path (504) in the direction of the axis (202) axially opposite the clamping ring (502) of the in FIG. 1 shown starting position displaced.
  • the shift from the starting position takes place against the force of a spring acting as a restoring element (505), which is designed as a spiral spring.
  • the spring (505) bears against an end edge (506) of the sliding sleeve (501), while the lower end face of the spring (505) rests on a peripheral shoulder (507) of the clamping ring (502).
  • the clutch assembly (600) between the rotatably mounted annular screwing tool (400) and the output shaft (200) consists on the one hand of a slip clutch with a first coupling element (603) and a second coupling element (604) and an externally connected and positively designed additional coupling.
  • the first coupling element (603) of the slip clutch is designed as a drive plate (605).
  • a drive plate (605) In the in FIG. 1 illustrated initial position of the screw is an internal toothing of the first coupling element (603) in the form of the drive plate (605) with an externally toothed portion (203) of the output shaft (200) in the circumferential direction of the output shaft in a positive connection.
  • the required frictional force between the first and second drive plate (602, 605) is significantly caused by the spring (601).
  • the sliding sleeve (501) from the in FIG. 1 moves to the receiving sleeve (501) by means of the ball bearing (405) rotatably mounted screwing tool (400) together with the two drive plates (602, 605) of the slip clutch relative to the output shaft (200), wherein the internally toothed passage of the drive plate (605) in a relative to the externally toothed portion (203) retracted portion (204) of the output shaft (200) passes, so that the power flow between the output shaft (200) and the first coupling element (603) is separated in the form of the drive plate (605).
  • the passage of the drive plate (602) is constantly in the recessed portion (204) so that torques are not instantaneously applied to the passage from the output shaft (200).
  • the circuit of this form-fitting clutch (203/204) is carried out by the exertion of a compressive force on the screwdriver (100) against the force of the spring (505), which must be exercised anyway if the screwdriver tip (201) in the head (300). the inner screw (301) should engage.
  • the thereby automatically occurring decoupling of the annular screwing tool (400) from the output shaft (200) has the consequence that on the sleeve (303) no more torques are transmitted while the inner screw (301) is rotated.
  • the tightening torque for the internal screw (301) is determined solely by the predetermined by the shut-off of the screwdriver (100) torque, which may be different from the predetermined by the slip clutch torque for the sleeve (303).

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
  • Valve Device For Special Equipments (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)

Abstract

The invention relates to a screwing tool that comprises a drive arranged in a housing and an output shaft connected to said drive, a screwdriver point being arranged at the front face of the output shaft. The aim of the invention is to provide a screwing tool with which different connecting elements, in particular actuating and clamping elements consisting of a screwable sleeve and an inner screw can be screwed with only a single screwing tool. In order to achieve this aim, the screwing tool comprises a receiving part (500) which surrounds the output shaft and is displaceably guided in the direction of the axis (202) of the output shaft (200) against the force of a return element (505). Furthermore, an annular screwing tool (400), which surrounds the output shaft (200) and the screwdriver point (201), is rotatably mounted on the receiving part (500) for detecting the drive contours (305) of the peripheral surface (304) of a connecting element (303), at least one shiftable clutch (600) being arranged between the rotatably mounted annular screwing tool (400) and the output shaft (200).

Description

Die Erfindung betrifft ein Schraubwerkzeug entsprechend dem Oberbegriff des Anspruchs 1.The invention relates to a screwing tool according to the preamble of claim 1.

Solch ein Schraubwerkzeug ist beispielsweise aus der DE-A-19527115 bekannt.Such a screwing tool is for example from the DE-A-19527115 known.

In elektrisch oder pneumatisch angetriebenen Schraubwerkzeugen werden üblicherweise kurze, austauschbare Schraubendreherspitzen (auch als Bits bezeichnet) verwendet. Die Schraubedreherspitzen sind an unterschiedliche Formen von Schraubenköpfen, insbesondere von Schlitzschrauben, KreuzSchlitz-Schrauben, Innensechskant-Schrauben sowie Torx-Schrauben angepasst. Derartige Schraubwerkzeuge kommen unter anderem in Form der stark verbreiteten Akku-Schrauber zum Einsatz, mit denen sich mit geringem Kraftaufwand und rasch Bauteile miteinander befestigen lassen, ohne den Schraubenkopf zu beschädigen.In electrically or pneumatically driven screwing tools usually short, replaceable screwdriver tips (also referred to as bits) are used. The screwdriver tips are adapted to different shapes of screw heads, in particular slotted screws, cross-slotted screws, hexagon socket screws and Torx screws. Such screwing tools are used, inter alia, in the form of the widely used cordless screwdrivers with which can be fastened together with little effort and quickly components without damaging the screw head.

Aufgrund der vorgenannten Vorzüge hat sich die Verwendung von motorisch angetriebenen Schraubwerkzeugen insbesondere auch in der Automobilproduktion durchgesetzt. Für bestimmte Montageaufgaben an Kraftfahrzeugen müssen so genannte Stell-Klemm-Elemente am Fahrzeug angebracht werden, die aus einer hohlzylindrischen Hülse sowie einer sich durch den Hohlzylinder erstreckenden Innen-Schraube bestehen. Diese Stell-Klemm-Elemente werden derzeit mit zwei unterschiedlichen Schraubwerkzeugen angebracht. Zum Einschrauben der Schraubhülse kommt ein ringförmiges Schraubwerkzeug zum Erfassen der Antriebsprofile an der Mantelfläche der Hülse zum Einsatz, während die Innen-Schraube mit einem Schraubwerkzeug eingedreht wird, dessen Schraubendreherspitze stirnseitig in den Schraubenkopf eingreift.Due to the aforementioned advantages, the use of motor-driven screwing has prevailed especially in the automotive industry. For certain assembly tasks on motor vehicles so-called adjusting clamp elements must be mounted on the vehicle, which consist of a hollow cylindrical sleeve and an extending through the hollow cylinder inner screw. These adjustable clamp elements are currently mounted with two different screwdrivers. To screw the screw sleeve is an annular screwing tool for detecting the drive profiles on the lateral surface of the sleeve used, while the inner screw is screwed with a screwing, the screwdriver tip engages the front side into the screw head.

Vielfach müssen beim Einschrauben von Innen-Schraube und Hülse unterschiedliche Anzugsmomente berücksichtigt werden, so dass die vorzuhaltenden Schraubwerkzeuge Abschaltkupplungen mit unterschiedlichen Abschaltmomenten aufweisen müssen.In many cases, different tightening torques must be taken into account when screwing in the inner screw and the sleeve so that the screwing tools to be provided must have shut-off clutches with different shut-off torques.

Ausgehend von diesem Stand der Technik liegt der Erfindung die Aufgabe zu Grunde, ein Schraubwerkzeug der eingangs erwähnten Art zu schaffen, mit dem sich unterschiedliche Verbindungselemente, insbesondere Stell-Klemm-Elemente bestehend aus einer einschraubbaren Hülse und einer Innen-Schraube mit nur einem Schraubwerkzeug anbringen lassen. Ein weiteres Ziel der Erfindung besteht darin, die unterschiedlichen Verbindungselemente mit unterschiedlichen Anzugsmomenten anziehen zu können.Based on this prior art, the invention is based on the object to provide a screwing tool of the type mentioned, with which attach different connecting elements, in particular adjusting clamping elements consisting of a screw-sleeve and an internal screw with only one screwing to let. Another object of the invention is to be able to attract the different fasteners with different torques.

Diese Aufgabe wird durch ein Schraubwerkzeug mit den Merkmalen des Anspruchs 1 gelöst.This object is achieved by a screwing with the features of claim 1.

Die axiale Verschieblichkeit des Aufnahmeteils ermöglicht eine Relativbewegung zwischen dem an dem Aufnahmeteil drehbar gelagerten ringförmigen Schraubwerkzeug sowie der stirnseitig an der Abtriebswelle angeordneten Schraubendreherspitze, so dass entweder das ringförmige Schraubwerkzeug oder die Schraubendreherspitze zum Einsatz gelangt. Für den Einsatz der Schraubendreherspitze, muss mit einer in Achsrichtung der Abtriebswelle wirkenden Kraft gegen den Schraubenkopf gedrückt werden. Hierdurch bewegt sich das Aufnahmeteil gegen die Kraft des Rückstellelementes in Richtung der Achse der Abtriebswelle von der Schraubendreherspitze weg, so dass diese den Schraubenkopf der Innen-Schraube erfassen kann.The axial displaceability of the receiving part allows a relative movement between the rotatably mounted on the receiving part annular screwing tool and the front side arranged on the output shaft screwdriver tip, so that either the annular screwing tool or the screwdriver tip is used. For the use of the screwdriver tip, must be in the axial direction of the Output shaft acting force are pressed against the screw head. As a result, the receiving part moves against the force of the return element in the direction of the axis of the output shaft away from the screwdriver tip, so that they can detect the screw head of the inner screw.

Zwischen dem drehbar gelagerten ringförmigen Schraubwerkzeug und der Abtriebswelle ist zumindest eine schaltbare Kupplung angeordnet, die den Kraftfluss zwischen der Abtriebswelle und dem ringförmigen Schraubwerkzeug trennt oder verbindet. Die schaltbare Kupplung ist vorzugsweise kraftschlüssig und selbstschaltend, insbesondere als Rutschkupplung ausgeführt, die bei Erreichen des Anzugsmomentes den Kraftfluss zwischen Abtriebswelle und dem ringförmigen Schraubwerkzeug trennt. Durch die konstruktive Auslegung der Rutschkupplung kann das Anzugsmoment des ringförmigen Schraubwerkzeugs bestimmt werden. Die Rutschkupplung ist vorzugsweise als Lamellenkupplung ausgelegt. Grundsätzlich kommen jedoch auch andere Bauformen in Betracht.Between the rotatably mounted annular screwing tool and the output shaft, at least one switchable coupling is arranged, which separates or connects the power flow between the output shaft and the annular screwing tool. The switchable coupling is preferably non-positively and self-switching, in particular designed as a slip clutch, which separates the power flow between the output shaft and the annular screw when reaching the tightening torque. The design of the slip clutch, the tightening torque of the annular screwing can be determined. The slip clutch is preferably designed as a multi-plate clutch. In principle, however, other types come into consideration.

In besonders bevorzugter Ausführungsform der Erfindung ist zusätzlich zu der kraftschlüssigen, selbstschaltend ausgeführten Rutschkupplung eine fremdgeschaltete und formschlüssig ausgeführte Kupplung zwischen dem drehbar gelagerten ringförmigen Schraubwerkzeug und der Abtriebswelle angeordnet. Die Schaltung dieser formschlüssig ausgeführten Kupplung wird vorzugsweise dadurch bewirkt, dass der Kraftfluss zwischen dem mit der Abtriebswelle verbundenen ersten Kupplungselement der Rutschkupplung und der Abtriebswelle durch eine Axialverschiebung des ersten Kupplungselementes längs der Achse der Abtriebswelle getrennt wird. Diese Axialverschiebung des ersten Kupplungselementes wird dadurch unterstützt, dass das erste Kupplungselement von der Kraft einer Feder beaufschlagt wird, die zwischen dem ersten Kupplungselement und dem ringförmigen Schraubwerkzeug angeordnet ist. Die das Drehmoment der Rutschkupplung bestimmende Federkraft wirkt in Richtung des zweiten Kupplungselementes. Die für den Einsatz der Schraubendreherspitze ohnehin erforderliche Axialverschiebung des Aufnahmeteils bewirkt aufgrund dieser Konstruktion zugleich eine Axialverschiebung des ersten Kupplungselementes der Rutschkupplung längs der Achse der Abtriebswelle in einem Bereich der Abtriebswelle, in dem die Formschlusskonturen der zusätzlichen Kupplung außer Eingriff gelangen. Die zusätzliche Kupplung verhindert, dass während der Nutzung der Schraubendreherspitze des Schraubwerkzeugs ein Drehmoment auf das ringförmige Schraubwerkzeug von der entkoppelten Abtriebswelle ausgeübt wird. Diese Momentenfreiheit ist jedoch nicht zwingend erforderlich, da die Rutschkupplung bauartbedingt ein Überschreiten des Anzugsmomentes des von dem ringförmigen Schraubwerkzeugs erfassten Verbindungselementes wirksam verhindert.In a particularly preferred embodiment of the invention, in addition to the non-positive, self-switching running slip clutch is a foreign-connected and form-fitting executed coupling between the rotatably mounted annular screw and the output shaft. The circuit of this positively designed coupling is preferably effected in that the power flow between the output shaft connected to the first clutch element of the slip clutch and the output shaft is separated by an axial displacement of the first coupling element along the axis of the output shaft. This axial displacement of the first coupling element is supported by the fact that the first coupling element is acted upon by the force of a spring, which is arranged between the first coupling element and the annular screwing tool. The torque of the slip clutch determining spring force acts in the direction of the second coupling element. Due to this construction, the axial displacement of the receiving part, which is in any case required for the use of the screwdriver tip, simultaneously causes an axial displacement of the first coupling element of the slip clutch along the axis of the output shaft in a region of the output shaft in which the positive locking contours of the additional clutch are disengaged. The additional clutch prevents torque being applied to the annular wrenching tool from the decoupled output shaft during use of the screwdriver tip of the wrenching tool. However, this torque freedom is not absolutely necessary, since the slip clutch effectively prevents exceeding the tightening torque of the detected by the annular screwing fastener due to design.

Das vorzugsweise hülsenförmige Aufnahmeteil zur drehbaren Lagerung des ringförmigen Schraubwerkzeuges ist insbesondere verdrehgesichert zu dem Gehäuse des Schraubwerkzeuges in Achsrichtung der Abtriebswelle geführt. Die Verdrehsicherung erfolgt beispielsweise mittels einer Passfeder.The preferably sleeve-shaped receiving part for the rotatable mounting of the annular screwing tool is in particular guided against rotation to the housing of the screwing tool in the axial direction of the output shaft. The rotation is effected for example by means of a feather key.

Um beim Eindrehen der Innen-Schraube mit der Schraubendreherspitze eine Verdrehung des ringförmigen Schraubwerkzeuges zu verhindern, sind an dem Aufnahmeteil vorzugsweise Mittel zum zeitweiligen Arretieren des ringförmigen Schraubwerkzeuges angeordnet. Zum Arretieren kommen insbesondere Formschlusskonturen oder Reibmittel, beispielsweise in Form eines Reibbelages oder einer Verzahnung in Betracht. Die Mittel zum Arretieren kommen vorzugsweise durch die Axialbewegung des Aufnahmeteils selbstständig zum Eingriff, wenn das Aufnahmeteil in Richtung des Gehäuses des Schraubwerkzeuges verschoben wird.In order to prevent rotation of the annular screwing tool when screwing the inner screw with the screwdriver tip, preferably means for temporarily locking the annular screwing tool are arranged on the receiving part. For locking come in particular form-fitting contours or friction means, for example in the form of a friction lining or a toothing into consideration. The means for locking come preferably by the axial movement of the receiving part automatically engaged when the receiving part is moved in the direction of the housing of the screwing.

Nachfolgend wird die Erfindung anhand der Figuren näher erläutert. Es zeigen

Figur 1
eine schematische Schnittdarstellung eines erfindungsgemäßen Schraubwerkzeuges sowie
The invention will be explained in more detail with reference to the figures. Show it
FIG. 1
a schematic sectional view of a screwing tool according to the invention and

Das erfindungsgemäße Schraubwerkzeug umfasst einen herkömmlichen Schrauber (100) mit einem in einem in Figur 1 lediglich teilweise dargestellten Gehäuse (101) angeordneten elektrischen Antrieb, der mit einer Abtriebswelle (200) verbunden ist. Zwischen dem nicht dargestellten Elektroantrieb des Schraubers (100) und der Abtriebswelle (200) ist üblicherweise eine mechanische oder elektronische Drehmoment-Abschaltkupplung angeordnet, die bei Erreichen eines gewünschten Anzugmomentes den Kraftfluss zwischen Elektroantrieb und Abtriebswelle (200) trennt. Am stirnseitigen Ende der Abtriebswelle (200) befindet sich die Schraubendreherspitze (201), die im dargestellten Ausführungsbeispiel als Torx-Schraubendreherspitze in Form eines sechszahnigen Sterns ausgebildet ist.The screwing tool according to the invention comprises a conventional screwdriver (100) with a in an in FIG. 1 only partially shown housing (101) arranged electric drive, which is connected to an output shaft (200). Between the electric drive of the screwdriver (100) and the output shaft (200), which is not shown, a mechanical or electronic torque shut-off clutch is usually arranged which, when a desired tightening torque is reached, separates the power flow between the electric drive and the output shaft (200). At the front end of the output shaft (200) is the screwdriver tip (201), which is formed in the illustrated embodiment as a Torx screwdriver tip in the form of a six-pointed star.

Die Schraubendreherspitze (201) ist stirnseitig in den Kopf (300) einer Innen-Schraube (301) einsteckbar. Die Innen-Schraube (301) ist Bestandteil eines so genannten Stell-Klemm-Elementes (302), das zu Montagezwecken in der Automobilindustrie zum Einsatz gelangt. Wie aus der Figur 1 erkennbar wird die Innen-Schraube (301) von einer hohlzylindrischen Hülse (303) umgeben. Die Hülse (303) weist an ihrer Mantelfläche (304) Antriebskonturen (305) auf, die von einem ringförmigen Schraubwerkzeug (400) in Drehung versetzbar sind. Zwischen der Hülse (303) und der Innen-Schraube (301) des Stell-Klemm-Elementes (302) ist ein die Innen-Schraube (301) umgebender elastischer Ring (306) angeordnet.The screwdriver tip (201) can be inserted into the head (300) of an internal screw (301) on the face side. The inner screw (301) is part of a so-called adjustable-clamping element (302), which is used for assembly purposes in the automotive industry. Like from the FIG. 1 recognizable the inner screw (301) by a hollow cylindrical sleeve (303) is surrounded. The sleeve (303) has on its lateral surface (304) drive contours (305) which can be set in rotation by an annular screwing tool (400). Between the sleeve (303) and the inner screw (301) of the adjusting-clamping element (302), a the inner screw (301) surrounding the elastic ring (306) is arranged.

Um mit dem Schrauber (100) sowohl die Innen-Schraube (301) des Stell-Klemm-Elementes (302) als auch die Hülse (303) anziehen zu können, weist der Schrauber (100) zusätzlich das ringförmige Schraubwerkzeug (400) auf, das drehbar an einem Aufnahmeteil (500) gelagert ist, das verdrehsicher jedoch in Richtung der Achse (202) der Abtriebswelle (200) verschiebbar geführt ist.In order to be able to tighten both the inner screw (301) of the setting / clamping element (302) and the sleeve (303) with the screwdriver (100), the screwdriver (100) additionally has the annular screwing tool (400), which is rotatably mounted on a receiving part (500), but non-rotatably in the direction of the axis (202) of the output shaft (200) is displaceably guided.

Zwischen dem drehbar gelagerten ringförmigen Schraubwerkzeug (400) und der Abtriebswelle (200) befindet sich zur Drehmomentübertragung eine Kupplungsanordnung (600).Between the rotatably mounted annular screwing tool (400) and the output shaft (200) there is a coupling arrangement (600) for torque transmission.

Stirnseitig weist das ringförmige Schraubwerkzeug (400) ein ringförmiges Profil (401) auf, das mit den Antriebskonturen (305) der Hülse (303) zusammenwirkt. In Richtung der Achse (202) unterhalb des ringförmigen Profils (401) befindet sich eine Schulter (402), die einerseits als stirnseitiger Anschlag der Hülse (303) und andererseits als Widerlager für eine Feder (601) dient, die auf die Kupplungsanordnung (600) einwirkt. Die Feder (601) ist im dargestellten Ausführungsbeispiel als Spiralfeder ausgestaltet. An der dem Profil (401) gegenüberliegenden Stirnseite weist das ringförmige Schraubwerkzeug (400) eine Lagerschale (403) auf, die im gezeigten Ausführungsbeispiel mit einer Schraubhülse (404) lösbar verbunden ist. Die Lagerschale (403) und die Schraubhülse (404) können jedoch auch einteilig ausgeführt sein.At the end, the annular screwing tool (400) has an annular profile (401) which cooperates with the drive contours (305) of the sleeve (303). In the direction of the axis (202) below the annular profile (401) is a shoulder (402) which serves as a stop on the front side of the sleeve (303) and on the other hand as an abutment for a spring (601) on the coupling arrangement (600 ) acts. The spring (601) is designed in the illustrated embodiment as a spiral spring. At the end face opposite the profile (401), the annular screwing tool (400) has a bearing shell (403), which in the exemplary embodiment shown is releasably connected to a threaded sleeve (404). However, the bearing shell (403) and the screw sleeve (404) can also be made in one piece.

Mit dem ringförmigen Schraubwerkzeug (400) ist darüber hinaus eine Mitnehmerscheibe (602) der Kupplungsanordnung (600) drehfest verbunden. Die Wirkungs- und Funktionsweise dieses Kupplungselementes (604) wird weiter unten näher erläutert.With the annular screwing tool (400) beyond a drive plate (602) of the clutch assembly (600) is rotatably connected. The operation and operation of this coupling element (604) will be explained in more detail below.

Das Aufnahmeteil (500) wird von einer Schiebehülse (501) gebildet, die einen hohlzylindrischen Klemmring (502) konzentrisch umgibt. Der Klemmring (502) ist an seiner dem Gehäuse (101) des Schraubers (100) zugewandten Stirnseite mit einer Spannvorrichtung (503) verbunden, die eine drehfeste Klemmverbindung mit dem Gehäuse (101) ermöglicht. Diese einfache Klemmverbindung erlaubt die problemlose Nachrüstung herkömmlicher Schrauber (100) mit den erfindungswesentlichen Komponenten (400, 500, 600).The receiving part (500) is formed by a sliding sleeve (501) which concentrically surrounds a hollow cylindrical clamping ring (502). The clamping ring (502) is at its the Housing (101) of the screwdriver (100) facing the end face with a clamping device (503), which allows a rotationally fixed clamping connection with the housing (101). This simple clamp connection allows easy retrofitting of conventional screwdrivers (100) with the components essential to the invention (400, 500, 600).

Die Schiebehülse (501) ist um den Verschiebeweg (504) in Richtung der Achse (202) axial gegenüber dem Klemmring (502) aus der in Figur 1 dargestellten Ausgangslage verschieblich geführt. Die Verschiebung aus der Ausgangslage erfolgt gegen die Kraft einer als Rückstellelement wirkenden Feder (505), die als Spiralfeder ausgebildet ist. An ihrem oberen Ende liegt die Feder (505) an einem stirnseitigen Rand (506) der Schiebehülse (501) an, während die untere Stirnseite der Feder (505) auf einer umlaufenden Schulter (507) des Klemmrings (502) aufliegt.The sliding sleeve (501) is about the displacement path (504) in the direction of the axis (202) axially opposite the clamping ring (502) of the in FIG. 1 shown starting position displaced. The shift from the starting position takes place against the force of a spring acting as a restoring element (505), which is designed as a spiral spring. At its upper end, the spring (505) bears against an end edge (506) of the sliding sleeve (501), while the lower end face of the spring (505) rests on a peripheral shoulder (507) of the clamping ring (502).

Die Kupplungsanordnung (600) zwischen dem drehbar gelagerten ringförmigen Schraubwerkzeugs (400) und der Abtriebswelle (200) besteht zum Einen aus einer Rutschkupplung mit einem ersten Kupplungselement (603) und einem zweiten Kupplungselement (604) sowie einer fremdgeschalteten und formschlüssig ausgeführten zusätzlichen Kupplung.The clutch assembly (600) between the rotatably mounted annular screwing tool (400) and the output shaft (200) consists on the one hand of a slip clutch with a first coupling element (603) and a second coupling element (604) and an externally connected and positively designed additional coupling.

Das erste Kupplungselement (603) der Rutschkupplung ist als Mitnehmerscheibe (605) ausgeführt. In der in Figur 1 dargestellten Ausgangslage des Schraubwerkzeuges steht eine Innenverzahnung des ersten Kupplungselementes (603) in Form der Mitnehmerscheibe (605) mit einem außenverzahnten Abschnitt (203) der Abtriebswelle (200) in Umfangsrichtung der Abtriebswelle in formschlüssiger Verbindung. Die erforderliche Reibkraft zwischen der ersten und zweiten Mitnehmerscheibe (602, 605) wird maßgeblich durch die Feder (601) hervorgerufen.The first coupling element (603) of the slip clutch is designed as a drive plate (605). In the in FIG. 1 illustrated initial position of the screw is an internal toothing of the first coupling element (603) in the form of the drive plate (605) with an externally toothed portion (203) of the output shaft (200) in the circumferential direction of the output shaft in a positive connection. The required frictional force between the first and second drive plate (602, 605) is significantly caused by the spring (601).

Wird nun die Schiebehülse (501) aus der in Figur 1 dargestellten Ausgangslage um den Verschiebeweg (504) in Pfeilrichtung (508) verschoben, bewegt sich das an der Aufnahmehülse (501) mittels des Kugellagers (405) drehbar gelagerte Schraubwerkzeug (400) zusammen mit den beiden Mitnehmerscheiben (602, 605) der Rutschkupplung relativ zu der Abtriebswelle (200), wobei der innenverzahnte Durchgang der Mitnehmerscheibe (605) in einen gegenüber dem außenverzahnten Abschnitt (203) eingezogenen Abschnitt (204) der Abtriebswelle (200) gelangt, so dass der Kraftfluss zwischen der Abtriebswelle (200) und dem ersten Kupplungselement (603) in Form von der Mitnehmerscheibe (605) getrennt wird. Der Durchgang der Mitnehmerscheibe (602) befindet sich ständig in dem eingezogenen Abschnitt (204), so dass auf den Durchgang zu keinem Zeitpunkt unmittelbar Drehmomente von der Abtriebswelle (200) ausgeübt werden.Now, the sliding sleeve (501) from the in FIG. 1 As shown starting position shifted by the displacement path (504) in the direction of arrow (508) moves to the receiving sleeve (501) by means of the ball bearing (405) rotatably mounted screwing tool (400) together with the two drive plates (602, 605) of the slip clutch relative to the output shaft (200), wherein the internally toothed passage of the drive plate (605) in a relative to the externally toothed portion (203) retracted portion (204) of the output shaft (200) passes, so that the power flow between the output shaft (200) and the first coupling element (603) is separated in the form of the drive plate (605). The passage of the drive plate (602) is constantly in the recessed portion (204) so that torques are not instantaneously applied to the passage from the output shaft (200).

Die Schaltung dieser formschlüssig ausgeführten Kupplung (203/204) erfolgt durch die Ausübung einer Druckkraft auf den Schrauber (100) entgegen der Kraft der Feder (505), die ohnehin ausgeübt werden muss, wenn die Schraubendreherspitze (201) in dem Kopf (300) der Innen-Schraube (301) eingreifen soll. Die dabei automatisch eintretende Entkopplung des ringförmigen Schraubwerkzeuges (400) von der Abtriebswelle (200) hat zur Folge, dass auf die Hülse (303) keine Drehmomente mehr übertragen werden, während die Innen-Schraube (301) gedreht wird. Das Anzugsmoment für die Innen-Schraube (301) wird ausschließlich von dem durch die Abschaltkupplung des Schraubers (100) vorgegebenen Drehmoment bestimmt, das abweichend zu dem durch die Rutschkupplung vorgegebenen Moment für die Hülse (303) sein kann.The circuit of this form-fitting clutch (203/204) is carried out by the exertion of a compressive force on the screwdriver (100) against the force of the spring (505), which must be exercised anyway if the screwdriver tip (201) in the head (300). the inner screw (301) should engage. The thereby automatically occurring decoupling of the annular screwing tool (400) from the output shaft (200) has the consequence that on the sleeve (303) no more torques are transmitted while the inner screw (301) is rotated. The tightening torque for the internal screw (301) is determined solely by the predetermined by the shut-off of the screwdriver (100) torque, which may be different from the predetermined by the slip clutch torque for the sleeve (303).

Im Ergebnis lassen sich mit dem erfindungsgemäßen Schraubwerkzeug unterschiedliche Verbindungselemente, insbesondere die Hülse (303) sowie die Innen-Schraube (301) mit einem einzigen Schraubwerkzeug mit unterschiedlichen Anzugsmomenten eindrehen. Die Notwendigkeit eines zweimaligen Ansetzens eines Schraubwerkzeugs sowie das Bereithalten unterschiedlicher Schraubwerkzeuge entfällt, wodurch insbesondere in industriellen Produktionsprozessen, beispielsweise der Automobilindustrie, erhebliche Kostenersparnisse durch reduzierte Montagezeiten und Werkzeugkosten erzielbar sind.As a result, with the screwing tool according to the invention different fasteners, in particular the sleeve (303) and the inner screw (301) with a single screwing with different Screw in tightening torques. The need for a two-time attachment of a screwing and the availability of different screwing eliminated, which in particular in industrial production processes, such as the automotive industry, significant cost savings through reduced assembly times and tooling costs can be achieved.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

Nr.No. Bezeichnungdescription Nr.No. Bezeichnungdescription 100100 SchrauberScrewdrivers 500500 Aufnahmeteilreceiving part 101101 Gehäusecasing 501501 Schiebehülsesliding sleeve 502502 Klemmringclamping ring 200200 Abtriebswelleoutput shaft 503503 Spannvorrichtungjig 201201 SchraubendrehspitzeScrew-driving tip 504504 Verschiebungshift 202202 Achseaxis 505505 Feder (Rückstellelement)Spring (return element) 203203 außenverzahnter Abschnittexternally toothed section 506506 stirnseitiger Randfrontal edge 204204 eingezogenen Abschnittretracted section 507507 umlaufende Schultercircumferential shoulder 508508 Pfeilrichtungarrow 300300 Kopfhead 301301 Innen-SchraubeInner screw 600600 Kupplungsanordnungclutch assembly 302302 Stell-Klemm-ElementVice-clamping element 601601 Federfeather 303303 Hülseshell 602602 Mitnehmerscheibedriver disc 304304 Mantelflächelateral surface 603603 erstes Kupplungselementfirst coupling element 305305 Antriebskonturdrive contour 604604 zweites Kupplungselementsecond coupling element 306306 elastischer Ringelastic ring 605605 Mitnehmerscheibedriver disc 400400 ringförmiges Schraubwerkzeugannular screwing tool 401401 ringförmiges Profilannular profile 402402 Schultershoulder 403403 Lagerschalebearing shell 404404 Schraubhülsethreaded 405405 Kugellagerball-bearing

Claims (9)

  1. A screwing tool comprising a drive arranged in a housing, an output shaft connected to the drive on which a screwdriver tip is arranged at the end and a mounting part (500) surrounding the output shaft, comprising a ring-shaped screwing tool (400) surrounding the output shaft (200) and the screwdriver tip (201) for gripping the drive contours (305) of the lateral surface (304) of a connecting element (303), characterised in that
    - the mounting part (500) is guided displaceably in the direction of the axis (202) of the output shaft (200) against the force of a restoring element (505) and the screwing tool (400) is rotatably mounted on the mounting part (500) and
    - that at least one shiftable clutch (600) is arranged between the rotatably mounted ring-shaped screwing tool (400) and the output shaft (200).
  2. The screwing tool according to claim 1, characterised in that the clutch is designed to be non-positive and self-shifting.
  3. The screwing tool according to claim 2, characterised in that the clutch (600) is a friction clutch with a first and a second clutch element (603/604).
  4. The screwing tool according to claim 2 or 3, characterised in that in addition to the non-positive and self-shifting clutch (603/604), an externally shifted and positive clutch (203/204) is arranged between the rotatably mounted ring-shaped screwing tool (400) and the output shaft (200).
  5. The screwing tool according to claim 3 or 4, characterised in that the flow of force between the first clutch element (603) connected to the output shaft (200) and the output shaft (200) can be interrupted by an axial displacement of the first clutch element (603) along the axis (202/508) of the output shaft.
  6. The screwing tool according to claim 5, characterised in that positively engaging contours (203) which can be brought into and out of engagement by the axial displacement and which are active in the circumferential direction of the output shaft (200) are arranged between the first clutch element (603) and the output shaft.
  7. The screwing tool according to one or more of claims 3 to 6, characterised in that the first clutch element (603) of the friction clutch is acted upon by the force of a spring (601), which is arranged between the first clutch element (603) and the ring-shaped screwing tool (400) and the force thereof acts in the direction of the second clutch element (604).
  8. The screwing tool according to one or more of claims 1 to 7, characterised in that the mounting part (500) is guided in a manner secured against rotation with respect to the housing (101) of the screwing tool.
  9. The screwing tool according to one or more of claims 1 to 8, characterised in that means for temporarily locking the ring-shaped screwing tool (400) are arranged on the mounting part (500).
EP08802589A 2007-10-04 2008-09-25 Screwing tool Active EP2114623B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007047611A DE102007047611A1 (en) 2007-10-04 2007-10-04 screwdriver tool
PCT/EP2008/008116 WO2009043531A1 (en) 2007-10-04 2008-09-25 Screwing tool

Publications (2)

Publication Number Publication Date
EP2114623A1 EP2114623A1 (en) 2009-11-11
EP2114623B1 true EP2114623B1 (en) 2011-01-05

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EP08802589A Active EP2114623B1 (en) 2007-10-04 2008-09-25 Screwing tool

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US (1) US8408097B2 (en)
EP (1) EP2114623B1 (en)
AT (1) ATE494107T1 (en)
DE (2) DE102007047611A1 (en)
WO (1) WO2009043531A1 (en)

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Publication number Priority date Publication date Assignee Title
US10166662B2 (en) * 2015-04-20 2019-01-01 GM Global Technology Operations LLC Hose clamp support tool
US10987795B2 (en) 2017-03-28 2021-04-27 Black & Decker Inc. Drill with screw holder
CN107932394B (en) * 2017-12-27 2024-01-30 广州亨龙智能装备股份有限公司 Screw tightening assembly and tightening device
US10998730B1 (en) 2019-04-26 2021-05-04 NeoVolta, Inc. Adaptive solar power battery storage system
CN112109030A (en) * 2020-10-15 2020-12-22 长虹美菱股份有限公司 Electric screwdriver structure with multiple screwdriver heads capable of synchronously screwing

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US1677473A (en) * 1927-01-12 1928-07-17 Gast William Walter Socket wrench and screw driver
US3779105A (en) * 1972-07-27 1973-12-18 Expando Products Co Fastener tool
SE377900B (en) * 1974-01-15 1975-08-04 Atlas Copco Ab
JPS59192465A (en) * 1983-04-13 1984-10-31 前田金属工業株式会社 Power rotary tool
US5255485A (en) * 1988-08-25 1993-10-26 Stuart H. Lemke Apparatus and method for installing roofing fasteners
DE3920471C1 (en) * 1989-06-22 1990-09-27 Wagner, Paul-Heinz, 5203 Much, De
US5207127A (en) * 1991-12-30 1993-05-04 Nick Edward V Fastener support apparatus
DE19507097A1 (en) * 1993-09-02 1996-09-05 Atlas Copco Tools Ab Compressed-air spanner with overload clutch
DE19527115A1 (en) 1995-07-25 1997-01-30 Kloeckner Humboldt Deutz Ag Method and device for adjustment and countering of adjuster screws - has tool with necessary keys arranged coaxially on body of tool allowing adjustment and countering with one hand at same time
DE10355812A1 (en) * 2003-11-28 2005-06-09 Robert Bosch Gmbh Power tool

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DE502008002207D1 (en) 2011-02-17
ATE494107T1 (en) 2011-01-15
DE102007047611A1 (en) 2009-04-09
EP2114623A1 (en) 2009-11-11
US8408097B2 (en) 2013-04-02
US20100199811A1 (en) 2010-08-12
WO2009043531A1 (en) 2009-04-09

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