EP1858670A1 - Torque transmitting device with press fit between the driving and driven parts, particularly a screwdriver - Google Patents

Torque transmitting device with press fit between the driving and driven parts, particularly a screwdriver

Info

Publication number
EP1858670A1
EP1858670A1 EP06708629A EP06708629A EP1858670A1 EP 1858670 A1 EP1858670 A1 EP 1858670A1 EP 06708629 A EP06708629 A EP 06708629A EP 06708629 A EP06708629 A EP 06708629A EP 1858670 A1 EP1858670 A1 EP 1858670A1
Authority
EP
European Patent Office
Prior art keywords
profile section
grooves
sections
section
rounded
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP06708629A
Other languages
German (de)
French (fr)
Other versions
EP1858670B1 (en
Inventor
Krzysztof Furgal
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.)
Wera Werk Hermann Werner GmbH and Co KG
Original Assignee
Wera Werk Hermann Werner GmbH and Co KG
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 Wera Werk Hermann Werner GmbH and Co KG filed Critical Wera Werk Hermann Werner GmbH and Co KG
Publication of EP1858670A1 publication Critical patent/EP1858670A1/en
Application granted granted Critical
Publication of EP1858670B1 publication Critical patent/EP1858670B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • B25B23/02—Arrangements for handling screws or nuts
    • B25B23/08—Arrangements for handling screws or nuts for holding or positioning screw or nut prior to or during its rotation
    • B25B23/10—Arrangements for handling screws or nuts for holding or positioning screw or nut prior to or during its rotation using mechanical gripping means
    • B25B23/105—Arrangements for handling screws or nuts for holding or positioning screw or nut prior to or during its rotation using mechanical gripping means the gripping device being an integral part of the driving bit
    • B25B23/108—Arrangements for handling screws or nuts for holding or positioning screw or nut prior to or during its rotation using mechanical gripping means the gripping device being an integral part of the driving bit the driving bit being a Philips type bit, an Allen type bit or a 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
    • B25B15/00—Screwdrivers
    • B25B15/001—Screwdrivers characterised by material or shape of the tool bit
    • B25B15/004—Screwdrivers characterised by material or shape of the tool bit characterised by cross-section
    • B25B15/005—Screwdrivers characterised by material or shape of the tool bit characterised by cross-section with cross- or star-shaped cross-section

Definitions

  • the invention relates to a torque transmission device with a drive part, in particular in the form of a screwing tool, the profile section of which positively engages in a substantially cylindrical insertion opening of an output part, the cross section of the insertion opening distributing a plurality, in particular five or six, of the same circumferential direction and of identical design has concavely rounded edge sections which merge into convexly rounded edge sections with the same design, the convexly rounded edge sections alternating with the concavely rounded edge sections and having a smaller radius of curvature than the latter, and the profile section being one of the number of convexly rounded Edge sections of the insertion opening cross-section have a corresponding number of grooves each having a rounded bottom and ribs extending between the grooves, the apex lines of the ribs or the group ndlines of the grooves run at an acute angle to the axial direction of the profile section.
  • Such a torque transmission device is known on the market under the name "Torx Wedge".
  • the output parts are usually formed by screw heads.
  • the insertion openings in the screw heads have the shape of a hexagram, the corners of the hexagram being rounded such that concave and convex rounding sections of the cross section alternate with one another.
  • the opening is essentially cylindrical, ie the walls of the openings run without any significant taper.
  • the screwing tool inlet openings are usually embossed, they run slightly conically to form draft angles.
  • the drive part is the blade of a screwdriver or bit.
  • the profile section has ribs and grooves which alternately extend in the axial direction and the dimensions of the rounded Sections of the insertion opening are adapted.
  • the apex lines of the ribs and the base lines of the grooves run at an angle to the axis of the profile section which is between 2 1 A degrees and 3 1 A degrees.
  • the invention has for its object to provide means to develop the torque transmission device in such a way that the driven part and the drive part hold each other in a press fit.
  • the achievement of the object according to the invention results in a torque transmission device which is particularly suitable for the pairing of screw and screwing tool.
  • the profile section of a screwing tool designed according to the invention can be inserted into the insertion opening of a screw designed according to the invention.
  • the screw holds in the clamp on the screwing tool, so that the screw can be easily. No additional holding means are required to screw the screw into the associated threaded opening.
  • radially outward-pointing sections of the rib run on a conical surface around the axis of the profile section and that these cone-lacking surface sections of the ribs merge into the rounded bottoms of the grooves, forming a kink.
  • the grooves now form rounded bottoms, which run in particular on circular arc lines.
  • the ribs run forming a kink line, the apex lines of the ribs running in the middle of conical surface sections tapering towards the tip of the profile.
  • angles of the base lines and the angle of the apex lines are each different from the axis of the profile section.
  • the angle of the base line can be greater than the angle of the apex line to the axis of the profile section.
  • the angles of the base line to the profile section are preferably in the range between 1.5 and 3 degrees.
  • the angular amount depends to a large extent on the diameter of the profile section. With small diameters of the profile section, the angle is between 2.5 and 3 degrees. With an average diameter of the profile section between approximately 2.5 and 5 mm, the angle is 1.5 degrees. For larger diameters over 5 mm, larger angles are used.
  • the angles of the apex lines of the ribs to the axis of the profile section also vary with its diameter.
  • the angle is determined by pre-turning the blanks before working in the grooves.
  • frusto-conical profile sections are first turned.
  • the pre-rotation angle is preferably 2.5 degrees.
  • this angle can also be 5.5 degrees.
  • the angles are preferably selected so that the circumferential direction of the width of the conical lateral surface sections delimited by the kink lines increases from the front side of the profile section in such a way that it reaches a dimension in the end region of the zone of the profile section immersed in the insertion opening which corresponds to the distance between the insertion opening wall walls there. sections corresponds.
  • the kink lines in line contact the corresponding insertion opening wall sections of the insertion opening.
  • the circumferential sections that is to say the conical lateral surface sections, need not necessarily come into contact with the corresponding sections of the insertion opening.
  • the invention also relates to a screwing tool with a profile section, as described above. With this profile section, Torx screws can be manufactured in a clamped position.
  • FIG. 8 a screwing tool according to FIG. 1 inserted into a screwing tool insertion opening according to FIG. 7 along a section line according to line VIII-VIII in FIG. 7, 9: a representation according to FIG. 8, but along the section line IX-IX in FIG. 7,
  • FIG. 10 an enlarged top view of the screw head shown in FIG. 7 with the section of the profile cut in the plane of the end face of the screw head.
  • the exemplary embodiments shown in the figures are a drive part 1 which is formed by a screwdriver blade.
  • the free end of the drive part 1 has a profile section 2.
  • This profile section 2 has ribs 8 of the same design in the circumferential direction 6 and arranged at the same angular spacing of 60 degrees in each case.
  • Grooves 7 are located between the ribs 8, the grooves 7 being rounded groove bottoms exhibit.
  • the rounded groove bottoms 7 extend between two mutually parallel fold lines 12.
  • tapered jacket sections 11 of the ribs 8 extend.
  • the fold lines 12 move away from the free end from the face 2 1 of the Profile section 2 to each other.
  • the ribs 8 thus become wider with increasing distance from the end face 2 1 .
  • the apex lines 9 of the ribs 8 running through the center of the truncated cone surface sections 11 are at a distance A from one another. This distance A defines the width across flats. It corresponds to a distance B of the base lines 10 of the grooves 7 from one another.
  • the base lines 10 of the grooves 7 have an angle ⁇ to the axis M of the profile section 12.
  • the angle ⁇ can assume values between 1.5 and 3 degrees.
  • the values of the angle ⁇ lie with small diameters of the profile Section 2, i.e. for torx sizes 6 to 9 in the range between 2.5 and 3 degrees. These torx sizes have spacing dimensions A between 1.5 and 2.3 mm.
  • the angle ⁇ is preferably 1.5 degrees. With larger torx sizes, i.e. with diameters of over 5 mm, the angle ⁇ can assume values over 2 degrees.
  • the angle ⁇ which is the cone angle of the blank, is preferably between 2.5 and 5.3 degrees, the torx sizes 6 to 27 preferably forming the same cone angle.
  • the cone angle ß increases with larger torx sizes, TX30 or TX 40.
  • the sections 11 running on a circular arc line lie in contact with the wall sections of the concavely rounded sections 5 of the insertion opening 3.
  • the rounded sections 7 of the groove enter a surface contact with the convexly rounded sections 6 of the insertion opening 3, so that the torque is transmitted via a surface contact.
  • the surface contact is preferably carried out at a distance L from the end face 2 1 of the section 2 of the profile section. This is the region of the insertion zone of the section 2 of the profile within the insertion opening 3.
  • the depth of insertion L of the section 2 into the insertion opening 3 also varies the torx size.
  • the immersion depth is only 1 or a little more than 1 mm. With larger torx sizes, the immersion depth is 2 and more mm.
  • the angles .alpha. And .beta. And the distances A and B are selected such that the kink lines 12 come into contact with the wall sections 5, 6 of the insertion opening 3. This results in a wobble-free clamping fit.
  • the grooves extend over their entire length with a constant curve. This contour line remains the same. This means that the cross-sectional contour of the groove runs on a circular arc line that is always the same. The center point generating this circular arc lies outside the profile section.
  • the surface of the rounded groove 7 is thus a partial section of a cylinder jacket wall, the axis of the cylinder being inclined by an angle ⁇ with respect to the axis M.
  • this gap between the bottom of the groove 7 and the convex wall section 6 is closed.
  • the distance between the base lines 10 of two diagonally opposite grooves 7 at a distance L, which corresponds to the immersion depth, from the end face 2 1 is more than the distance dimension of the apex of two diametrically opposed convex wall sections 6 the profile section 2 is inserted into the corresponding opening 3, so a slight deformation occurs.
  • Profile section and wall of the insertion voltage are then in the edge region of the convexly rounded section 6 in a surface area to each other.

Landscapes

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

Abstract

The invention relates to a torque transmitting device with a driving part (1), particularly provided in the form of a screwdriver whose profile section (2) positively engages in an essentially cylindrical plug-in opening (3) of a driven part (4). The cross-section of the plug-in opening (3) has a number of, in particular, five or six edge sections (5), which are evenly distributed in the peripheral direction, are identical, are concavely rounded, and which, without folds, merge into convexly rounded identical edge sections (6). The convexly rounded edge sections (6) alternate with the concavely rounded edge sections (5) and have a smaller radius of curvature than the latter. The profile section (2) has a number of grooves (7), which each have a rounded bottom, the number of grooves corresponding to the number of the convexly rounded edge sections (5) of the plug-in opening cross-section, and the profile section also has fins (8) extending between the grooves. The apex lines (9) of the fins (8) or the ground lines (10) of the grooves (7) run at an acute angle to the axial direction of the profile section. The invention is characterized in that outwardly pointing sections of the fins (8) extend on a truncated cone lateral surface about the axis (M) of the profile section (2), and these truncated cone lateral surface sections (11) of the fins (8) merge into the rounded bottoms of the grooves (7) while forming a folding line (12).

Description

DREHMOMENTÜBERTRAGUNGSEINRICHTUNG MIT KLEMMSITZ ZWISCHEN ANTRIEBS- UND ABTRIEBSTEIL , INSBESONDERE S CHRAUB WERKZ EUGTORQUE TRANSMISSION DEVICE WITH CLAMP SEAT BETWEEN THE DRIVE AND OUTPUT PARTS, ESPECIALLY S SCHRAUB WERKZ EUG
Die Erfindung betrifft eine Drehmomentübertragungseinrichtung mit einem Antriebsteil, insbesondere in Form eines Schraubwerkzeuges , dessen Profilab- schnitt formschlüssig in eine im Wesentlichen zylinderförmige Einstecköffnung eines Abtriebsteiles eingreift, wobei der Querschnitt der Einstecköffnung eine Mehrzahl, insbesondere fünf oder sechs in Umf angsrichtung gleich verteilt und gleich gestaltete konkav gerundete Randabschnitte aufweist, die knickstel- lenfrei in konvex gerundete, jeweils gleich gestaltete Randabschnitte übergeht, wobei die konvex gerundeten Randabschnitte sich mit den konkav gerundeten Randabschnitten abwechseln und einen kleineren Krümmungsradius aufweisen als die letzteren, und wobei der Profilabschnitt eine der Anzahl der konvex gerundeten Randabschnitte des Einstecköffnungsquerschnittes entsprechende Anzahl von je einen gerundeten Boden aufweisende Nuten und zwischen den Nuten sich erstreckenden Rippen aufweist, wobei die Scheitellinien der Rippen bzw. die Grundlinien der Nuten spitzwinklig zur Achsrichtung des Profilabschnittes verlaufen.The invention relates to a torque transmission device with a drive part, in particular in the form of a screwing tool, the profile section of which positively engages in a substantially cylindrical insertion opening of an output part, the cross section of the insertion opening distributing a plurality, in particular five or six, of the same circumferential direction and of identical design has concavely rounded edge sections which merge into convexly rounded edge sections with the same design, the convexly rounded edge sections alternating with the concavely rounded edge sections and having a smaller radius of curvature than the latter, and the profile section being one of the number of convexly rounded Edge sections of the insertion opening cross-section have a corresponding number of grooves each having a rounded bottom and ribs extending between the grooves, the apex lines of the ribs or the group ndlines of the grooves run at an acute angle to the axial direction of the profile section.
Eine derartige Drehmomentübertragungseinrichtung ist auf dem Markt unter der Bezeichnung "Torx-Wedge" bekannt. Die Abtriebsteile werden in der Regel von Schraubenköpfen gebildet. Die Einstecköffnungen in den Schraubenköpfen besitzen die Form eines Hexagramms, wobei die Ecken des Hexagrammes derartig gerundet sind, dass konkave und konvexe Rundungsabschnitte des Querschnittes miteinander abwechseln. Die Öffnung ist im Wesentlichen zylindrisch gestaltet, d.h. die Wände der Öffnungen verlaufen ohne nennenswerte Verjüngung. Da die Schraubwerkzeugeintrittsöffnungen in der Regel aber geprägt werden, verlaufen sie geringfügig konisch, um Entformungsschrägen auszubilden. Bei dem Antriebsteil handelt es sich um die um die Klinge eines Schraubendrehers oder Bits. Der Profilabschnitt besitzt Rippen und Nuten, die sich in Axialrichtung erstreckend jeweils abwechseln und dem Maße der gerundeten Abschnitte der Einstecköffnung angepasst sind. Die Scheitellinien von Rippen und die Grundlinien der Nuten verlaufen in einem Winkel zur Achse des Profilabschnittes, der zwischen 21A Grad und 3 1A Grad beträgt.Such a torque transmission device is known on the market under the name "Torx Wedge". The output parts are usually formed by screw heads. The insertion openings in the screw heads have the shape of a hexagram, the corners of the hexagram being rounded such that concave and convex rounding sections of the cross section alternate with one another. The opening is essentially cylindrical, ie the walls of the openings run without any significant taper. However, since the screwing tool inlet openings are usually embossed, they run slightly conically to form draft angles. The drive part is the blade of a screwdriver or bit. The profile section has ribs and grooves which alternately extend in the axial direction and the dimensions of the rounded Sections of the insertion opening are adapted. The apex lines of the ribs and the base lines of the grooves run at an angle to the axis of the profile section which is between 2 1 A degrees and 3 1 A degrees.
Der Erfindung liegt die Aufgabe zugrunde, Mittel anzugeben, um die Drehmomentübertragungseinrichtung dahingehend weiterzubilden, dass das Abtriebsteil und das Antriebsteil im Klemmsitz zueinander halten.The invention has for its object to provide means to develop the torque transmission device in such a way that the driven part and the drive part hold each other in a press fit.
Gelöst wird die Aufgabe durch die in den Ansprüchen angegebene Erfindung. Jeder einzelne Anspruch stellt eine eigenständige Lösung der Aufgabe dar, wobei jeder Anspruch mit jedem beliebigen anderen Anspruch kombinierbar ist.The object is achieved by the invention specified in the claims. Each individual claim represents an independent solution to the task, and each claim can be combined with any other claim.
Der erfindungsgemäßen Lösung der Aufgabe zur Folge ist eine Drehmomentübertragungseinrichtung gegeben, die insbesondere für die Paarung Schraube und Schraubwerkzeug geeignet ist. Der entsprechend der Erfindung ausgebildete Profilabschnitt eines Schraubwerkzeuges kann in die Einstecköffnung einer entsprechend der Erfindung ausgestalteten Schraube eingesteckt werden. Die Schraube hält im Klemmsitz am Schraubwerkzeug, so dass die Schraube in einfacher Weise werden kann. Es sind keine zusätzlichen Haltemittel erf order- lieh, um die Schraube in die zugehörige Gewindeöffnung einzudrehen.The achievement of the object according to the invention results in a torque transmission device which is particularly suitable for the pairing of screw and screwing tool. The profile section of a screwing tool designed according to the invention can be inserted into the insertion opening of a screw designed according to the invention. The screw holds in the clamp on the screwing tool, so that the screw can be easily. No additional holding means are required to screw the screw into the associated threaded opening.
Es wird hierzu vom Anspruch 1 zunächst und im besonderen vorgeschlagen, dass radial nach außen weisende Abschnitte der Rippe auf einer Kegelmantelfläche um die Achse des Profilabschnittes verlaufen und diese Kegelmangelflä- chenabschnitte der Rippen unter Ausbildung eines Knicks in die gerundeten Böden der Nuten übergehen. Anders als die beispielsweise aus der DE 10107751 Al bekannte Lösung, bilden die Nuten jetzt gerundete Böden aus, die insbesondere auf Kreisbogenlinien verlaufen. Anders als bei dem obengenannten nicht druckschriftlich vorbekannten Stand der Technik verlaufen die Rippen unter Ausbildung einer Knicklinie, wobei die Scheitellinien der Rippen in der Mitte von zur Spitze des Profiles hin sich verjüngenden Kegelmantelflächenabschnitten verlaufen. In einer Weiterbildung der Erfindung ist vorgesehen, dass die Winkel der Grundlinien und der Winkel der Scheitellinien jeweils zur Achse des Profilabschnittes verschieden sind. Dabei können die Winkel der Grundlinie größer sein als die Winkel der Scheitellinie zur Achse des Profilabschnittes. Bevorzugt liegen die Winkel der Grundlinie zum Profilabschnitt im Bereich zwischen 1,5 und 3 Grad. Der Winkelbetrag hängt in erheblichem Maße vom Durchmesser des Profilabschnittes ab. Bei kleinen Durchmessern des Profilab- Schnittes beträgt der Winkel zwischen 2,5 und 3 Grad. Bei einem mittleren Durchmesser des Profilabschnittes etwa zwischen 2,5 und 5 mm beträgt der Winkel 1,5 Grad. Zu größeren Durchmessern über 5 mm werden wiederum größere Winkel verwendet. Auch die Winkel der Scheitellinien der Rippen zur Achse des Profilabschnittes variieren mit dessen Durchmesser. Der Winkel wird vor dem Einarbeiten der Nuten durch ein Vordrehen der Rohlinge bestimmt. Hierzu werden erst kegelstumpfförmige Profilabschnitte gedreht. Der Vordrehwinkel beträgt vorzugsweise 2,5 Grad. Bei größeren Durchmessern der Profilabschnitte kann dieser Winkel aber auch 5,5 Grad betragen. Die Winkel sind bevorzugt so gewählt, dass die Umfangsrichtung gemessene Breite der durch die Knicklinien begrenzten Kegelmantelflächenabschnitte von der Stirnseite des Profilabschnittes ausgehend derartig ansteigt, dass sie im Endbereich der in die Einstecköffnung eintauchenden Zone des Profilabschnittes ein Maß erreicht, welches dem dortigen Abstand der Einstecköffnungswandungs- abschnitte entspricht. Dies hat zur Folge, dass die Knicklinien in Linienanlage zu den entsprechenden Einstecköffnungswandungsabschnitten der Einstecköffnung treten. Hierdurch wird ein Klemmsitz erzeugt. Die Umf angsabschnitte, also die Kegelmantelflächenabschnitte brauchen dabei nicht notwendigerweise in Berührung an die entsprechenden Abschnitte der Einstecköffnung zu treten. Bei der Drehmomenteinleitung treten die konvex gerundeten Nutböden- abschnitte des Profilabschnittes gegen die entsprechenden, konkav gerundeten Abschnitte der Einstecköffnung in Flächenanlage. Zufolge der Flächenpressung können sich die Anlageflächen vergrößern. Die Erfindung betrifft darüber hinaus ein Schraubwerkzeug mit einem Profilabschnitt, wie er zuvor beschrieben worden ist. Mit diesem Profilabschnitt lassen sich Torx-Schrauben im Klemmsitz herstellen.For this purpose, it is initially and in particular proposed that radially outward-pointing sections of the rib run on a conical surface around the axis of the profile section and that these cone-lacking surface sections of the ribs merge into the rounded bottoms of the grooves, forming a kink. In contrast to the solution known, for example, from DE 10107751 A1, the grooves now form rounded bottoms, which run in particular on circular arc lines. In contrast to the prior art not previously known in writing, the ribs run forming a kink line, the apex lines of the ribs running in the middle of conical surface sections tapering towards the tip of the profile. In a further development of the invention it is provided that the angles of the base lines and the angle of the apex lines are each different from the axis of the profile section. The angle of the base line can be greater than the angle of the apex line to the axis of the profile section. The angles of the base line to the profile section are preferably in the range between 1.5 and 3 degrees. The angular amount depends to a large extent on the diameter of the profile section. With small diameters of the profile section, the angle is between 2.5 and 3 degrees. With an average diameter of the profile section between approximately 2.5 and 5 mm, the angle is 1.5 degrees. For larger diameters over 5 mm, larger angles are used. The angles of the apex lines of the ribs to the axis of the profile section also vary with its diameter. The angle is determined by pre-turning the blanks before working in the grooves. For this purpose, frusto-conical profile sections are first turned. The pre-rotation angle is preferably 2.5 degrees. For larger diameters of the profile sections, this angle can also be 5.5 degrees. The angles are preferably selected so that the circumferential direction of the width of the conical lateral surface sections delimited by the kink lines increases from the front side of the profile section in such a way that it reaches a dimension in the end region of the zone of the profile section immersed in the insertion opening which corresponds to the distance between the insertion opening wall walls there. sections corresponds. As a result, the kink lines in line contact the corresponding insertion opening wall sections of the insertion opening. This creates a press fit. The circumferential sections, that is to say the conical lateral surface sections, need not necessarily come into contact with the corresponding sections of the insertion opening. When the torque is introduced, the convexly rounded groove bottoms Sections of the profile section against the corresponding, concavely rounded sections of the insertion opening in surface contact. Due to the surface pressure, the contact surfaces can increase. The invention also relates to a screwing tool with a profile section, as described above. With this profile section, Torx screws can be manufactured in a clamped position.
Ein Ausführungsbeispiel der Erfindung wird nachfolgend anhand beigefügter Zeichnungen erläutert. Es zeigen:An embodiment of the invention is explained below with reference to the accompanying drawings. Show it:
Fig. 1: in perspektivischer Darstellung einen Antriebsteil in Form eines Endabschnittes eines Schraubwerkzeuges,1: a perspective view of a drive part in the form of an end portion of a screwing tool,
Fig. 2: die Seitenansicht des Antriebsteiles aus Fig. 2,2: the side view of the drive part from FIG. 2,
Fig. 3: einen Längsschnitt durch das Antriebsteil durch die Nutböden,3: a longitudinal section through the drive part through the groove bottoms,
Fig. 4: eine Ansicht gemäß Pfeil IV in Fig. 2,4: a view according to arrow IV in FIG. 2,
Fig. 5: einen Schnitt gemäß der Linie V - V in Fig. 2,5 shows a section along the line V - V in Fig. 2,
Fig. 6: einen Schnitt gemäß der Linie VI-VI in Fig. 2,6: a section along the line VI-VI in Fig. 2,
Fig. 7: in perspektivischer Darstellung ein Abtriebsteil in Form eines Schraubenkopfes,7: a perspective view of an output part in the form of a screw head,
Fig. 8: ein in eine Schraubwerkzeugeinstecköffnung gemäß Fig. 7 eingestecktes Schraubwerkzeug gemäß Fig. 1 entlang einer Schnittlinie gemäß der Linie VIII-VIII in Fig. 7, Fig. 9: eine Darstellung gemäß Fig. 8, jedoch entlang der Schnittlinie IX-IX in Fig. 7,8: a screwing tool according to FIG. 1 inserted into a screwing tool insertion opening according to FIG. 7 along a section line according to line VIII-VIII in FIG. 7, 9: a representation according to FIG. 8, but along the section line IX-IX in FIG. 7,
Fig. 10: eine ausschnittsvergrößerte Draufsicht auf den in Fig. 7 dargestellten Schraubenkopf mit in der Ebene der Stirnseite des Schraubenkopfes geschnittenen Profilabschnitt.FIG. 10: an enlarged top view of the screw head shown in FIG. 7 with the section of the profile cut in the plane of the end face of the screw head.
Bei den in den Fig. dargestellten Ausführungsbeispielen handelt es sich um ein Antriebsteil 1, welches von einer Schraubendreherklinge ausgebildet ist. Das freie Ende des Antriebsteiles 1 besitzt einen Profilabschnitt 2. Dieser Profilab- schnitt 2 besitzt in Umf angsrichtung 6 gleichgestaltete und in gleichem Winkelabstand von jeweils 60 Grad angeordnete Rippen 8. Zwischen den Rippen 8 befinden sich jeweils Nuten 7, wobei die Nuten 7 gerundete Nutböden aufweisen. Die gerundeten Nutböden 7 erstrecken sich zwischen jeweils zwei parallel zueinander verlaufenden Knicklinien 12. Zwischen jeweils eine Nut 7 begren- zenden Knicklinien 12 erstrecken sich Kegelmantelabschnitte 11 der Rippen 8. Die Knicklinien 12 entfernen sich mit Abstand vom freien Ende also von der Stirnseite 21 des Profilabschnittes 2 zueinander. Die Rippen 8 werden somit mit zunehmendem Abstand von der Stirnfläche 21 breiter.The exemplary embodiments shown in the figures are a drive part 1 which is formed by a screwdriver blade. The free end of the drive part 1 has a profile section 2. This profile section 2 has ribs 8 of the same design in the circumferential direction 6 and arranged at the same angular spacing of 60 degrees in each case. Grooves 7 are located between the ribs 8, the grooves 7 being rounded groove bottoms exhibit. The rounded groove bottoms 7 extend between two mutually parallel fold lines 12. Between each of a groove 7 delimiting fold lines 12, tapered jacket sections 11 of the ribs 8 extend. The fold lines 12 move away from the free end from the face 2 1 of the Profile section 2 to each other. The ribs 8 thus become wider with increasing distance from the end face 2 1 .
Die durch die Mitte der Kegelstumpfmantelflächenabschnitte 11 verlaufende Scheitellinien 9 der Rippen 8 haben einen Abstand A voneinander. Dieser Abstand A definiert die Schlüsselweite. Er korrespondiert zu einem Abstand B der Grundlinien 10 der Nuten 7 zueinander.The apex lines 9 of the ribs 8 running through the center of the truncated cone surface sections 11 are at a distance A from one another. This distance A defines the width across flats. It corresponds to a distance B of the base lines 10 of the grooves 7 from one another.
Die Grundlinien 10 der Nuten 7 haben einen Winkel α zur Achse M des Profilabschnittes 12. Der Winkel α kann Werte zwischen 1,5 und 3 Grad annehmen. Dabei liegen die Werte des Winkel α bei kleinen Durchmessern des Profilab- Schnittes 2, also bei Torxgrößen 6 bis 9 im Bereich zwischen 2,5 und 3 Grad. Diese Torxgrößen besitzen Abstandsmaße A zwischen 1,5 und 2,3 mm.The base lines 10 of the grooves 7 have an angle α to the axis M of the profile section 12. The angle α can assume values between 1.5 and 3 degrees. The values of the angle α lie with small diameters of the profile Section 2, i.e. for torx sizes 6 to 9 in the range between 2.5 and 3 degrees. These torx sizes have spacing dimensions A between 1.5 and 2.3 mm.
Bei Torxgrößen 10 bis 27, bei denen die Abstandsmaße A im Bereich zwischen 2,5 und 5 mm liegen, beträgt der Winkel α vorzugsweise 1,5 Grad. Bei größeren Torxgrößen, also bei Durchmessern von über 5 mm kann der Winkel α Werte über 2 Grad annehmen.For torx sizes 10 to 27, in which the distance dimensions A are in the range between 2.5 and 5 mm, the angle α is preferably 1.5 degrees. With larger torx sizes, i.e. with diameters of over 5 mm, the angle α can assume values over 2 degrees.
Der Winkel ß, welcher der Konuswinkel des Rohlinges ist, liegt vorzugsweise zwischen 2,5 und 5,3 Grad, wobei die Torxgrößen 6 bis 27 vorzugsweise denselben Konuswinkel ausbilden. Zu größeren Torxgrößen, TX30 oder TX 40 steigt der Konuswinkel ß an.The angle β, which is the cone angle of the blank, is preferably between 2.5 and 5.3 degrees, the torx sizes 6 to 27 preferably forming the same cone angle. The cone angle ß increases with larger torx sizes, TX30 or TX 40.
Wie aus den Fig. 8 und 9 hervorgeht, ist es nicht notwendig, dass die auf einer Kreisbogenlinie verlaufenden Abschnitte 11 in berührender Anlage an den Wandabschnitten der konkav gerundeten Abschnitte 5 der Einstecköffnung 3 anliegen. Es ist allerdings vorgesehen, dass die Rundungsabschnitte 7 der Nut in eine Flächenanlage treten zu den konvex gerundeten Abschnitten 6 der Einstecköffnung 3, so dass die Drehmomentübertragung über eine Flächenanlage erfolgt. Dabei erfolgt die Flächenanlage vorzugsweise in dem Abstand L von der Stirnfläche 21 entfernten Abschnitt des Profilabschnittes 2. Es handelt sich hierbei um den randnahen Bereich der Einsteckzone des Profilabschnittes 2 innerhalb der Einstecköffnung 3. Die Eintauchtiefe L des Profilabschnittes 2 in die Einstecköffnung 3 variiert mit der Torxgröße. Bei kleinen Torxgrößen beträgt die Eintauchtiefe nur 1 oder wenig mehr als 1 mm. Bei größeren Torxgrößen beträgt die Eintauchtiefe 2 und mehr mm. Die Winkel α und ß sowie die Abstände A und B sind so gewählt, dass die Knicklinien 12 in Klemmanlage treten zu Wandungsabschnitten 5, 6 der Einstecköffnung 3. Hierdurch wird ein wackelfreier Klemmsitz erreicht.As can be seen from FIGS. 8 and 9, it is not necessary that the sections 11 running on a circular arc line lie in contact with the wall sections of the concavely rounded sections 5 of the insertion opening 3. However, it is envisaged that the rounded sections 7 of the groove enter a surface contact with the convexly rounded sections 6 of the insertion opening 3, so that the torque is transmitted via a surface contact. The surface contact is preferably carried out at a distance L from the end face 2 1 of the section 2 of the profile section. This is the region of the insertion zone of the section 2 of the profile within the insertion opening 3. The depth of insertion L of the section 2 into the insertion opening 3 also varies the torx size. With small torx sizes, the immersion depth is only 1 or a little more than 1 mm. With larger torx sizes, the immersion depth is 2 and more mm. The angles .alpha. And .beta. And the distances A and B are selected such that the kink lines 12 come into contact with the wall sections 5, 6 of the insertion opening 3. This results in a wobble-free clamping fit.
Die Nuten erstrecken sich über ihre gesamte Länge mit einer gleichbleibenden Rundung. Diese Konturlinie bleibt gleich. Das bedeutet, dass die Querschnittskontur der Nut auf einer Kreisbogenlinie verläuft, die immer dieselbe ist. Der diesen Kreisbogen erzeugende Mittelpunkt liegt außerhalb des Profilabschnittes. Die Fläche der gerundeten Nut 7 ist somit ein Teilabschnitt einer Zylinder- mantelwand, wobei die Achse des Zylinders um einen Winkel α gegenüber der Achse M geneigt ist.The grooves extend over their entire length with a constant curve. This contour line remains the same. This means that the cross-sectional contour of the groove runs on a circular arc line that is always the same. The center point generating this circular arc lies outside the profile section. The surface of the rounded groove 7 is thus a partial section of a cylinder jacket wall, the axis of the cylinder being inclined by an angle α with respect to the axis M.
In einer Weiterbildung der Erfindung ist vorgesehen, dass nur der Zentralbereich der Nut 7 im Bereich ihrer Grundlinie 10 auf einer Kreisbogenlinie ver- läuft. Die Ränder der Nut hin zur Knicklinie 12 können dann geringfügig flacher verlaufen jedoch knickfrei.In a further development of the invention it is provided that only the central area of the groove 7 runs in the area of its base line 10 on a circular arc line. The edges of the groove towards the kink line 12 can then be slightly flatter, but without kinks.
In der Fig. 10 ist der Spalt zwischen der Nut 7 und dem konvexen Wandungsabschnitt 6 stark vergrößert dargestellt.10, the gap between the groove 7 and the convex wall section 6 is shown greatly enlarged.
In einer Variante der Erfindung ist vorgesehen, dass dieser Spalt zwischen dem Boden der Nut 7 und dem konvexen Wandungsabschnitt 6 geschlossen ist. Um dies zu erreichen, beträgt der Abstand der Grundlinien 10 zweier sich diagonal gegenüberliegenden Nuten 7 in einem Abstand L, der der Eintauchtiefe ent- spricht, von der Stirnfläche 21 mehr, als das Abstandsmaß der Scheitel zweier sich diametral gegenüberliegender konvexer Wandungsabschnitte 6. Wird der Profilabschnitt 2 in die entsprechende Öffnung 3 eingesteckt, so tritt eine geringfügige Deformierung auf. Profilabschnitt und Wandung der Einstecköff- nung liegen dann im Randbereich des konvex gerundeten Abschnittes 6 in einer Flächenanlage zueinander.In a variant of the invention it is provided that this gap between the bottom of the groove 7 and the convex wall section 6 is closed. To achieve this, the distance between the base lines 10 of two diagonally opposite grooves 7 at a distance L, which corresponds to the immersion depth, from the end face 2 1 is more than the distance dimension of the apex of two diametrically opposed convex wall sections 6 the profile section 2 is inserted into the corresponding opening 3, so a slight deformation occurs. Profile section and wall of the insertion voltage are then in the edge region of the convexly rounded section 6 in a surface area to each other.
Alle offenbarten Merkmale sind (für sich) erfindungswesentlich. In die Offenbarung der Anmeldung wird hiermit auch der Offenbarungsinhalt der zugehörigen/beigefügten Prioritätsunter lagen (Abschrift der Voranmeldung) vollinhaltlich mit einbezogen, auch zu dem Zweck, Merkmale dieser Unterlagen in Ansprüche vorliegender Anmeldung mit aufzunehmen. All of the features disclosed are (in themselves) essential to the invention. The disclosure content of the associated / attached priority documents (copy of the prior application) is hereby also included in full in the disclosure of the application, also for the purpose of including features of these documents in claims of the present application.

Claims

ANSPRÜCHE EXPECTATIONS
1. Drehmomentübertragungseinrichtung mit einem Antriebsteil (1), insbesondere in Form eines Schraubwerkzeuges, dessen Profilabschnitt (2) formschlüssig in eine im Wesentlichen zylinderförmige Einstecköffnung (3) eines Abtriebsteiles (4) eingreift, wobei der Querschnitt der Einstecköffnung (3) eine Mehrzahl, insbesondere fünf oder sechs in Umf angsrich- tung gleich verteilt und gleich gestaltete konkav gerundete Randabschnitte (5) aufweist, die knickstellenfrei in konvex gerundete, jeweils gleich gestaltete Randabschnitte (6) übergehen, wobei die konvex gerundeten Randabschnitte (6) sich mit den konkav gerundeten Randabschnitten (5) abwechseln und einen kleineren Krümmungsradius aufweisen als die letzteren, und wobei der Profilabschnitt (2) eine der Anzahl der konvex gerundeten Randabschnitte (5) des Einstecköffnungsquerschnittes entsprechende Anzahl von je einen gerundeten Boden aufweisende Nuten (7) und zwischen den Nuten (7) sich erstreckenden Rippen (8) aufweist, wobei die Scheitellinien (9) der Rippen (8) bzw. die Grundlinien (10) der Nuten (7) spitzwinklig zur Achsrichtung des Profilabschnittes verlaufen, dadurch gekennzeichnet, dass radial nach außen weisende Abschnitte der Rippen (8) auf einer Kegelstumpfmantelfläche um die Achse (M) des Profilabschnittes (2) verlaufen und diese Kegelmantelflächenabschnitte (11) der Rippen (8) unter Ausbildung einer Knicklinie (12) in die gerundeten Böden der Nuten (7) übergehen.1. Torque transmission device with a drive part (1), in particular in the form of a screwing tool, the profile section (2) of which positively engages in a substantially cylindrical insertion opening (3) of an output part (4), the cross section of the insertion opening (3) being a plurality, in particular has five or six equally distributed in the circumferential direction and identically designed concavely rounded edge sections (5) which merge into convexly rounded, respectively identically designed edge sections (6) without kinks, the convexly rounded edge sections (6) merging with the concavely rounded edge sections (5) alternate and have a smaller radius of curvature than the latter, and wherein the profile section (2) has a number corresponding to the number of convexly rounded edge sections (5) of the insertion opening cross-section, each having a rounded bottom with grooves (7) and between the grooves (7 ) extending ribs (8), the apex lines (9) of the ribs (8) or the base lines (10) of the grooves (7) run at an acute angle to the axial direction of the profile section, characterized in that radially outward-pointing sections of the ribs (8) on a truncated cone surface around the axis (M ) of the profile section (2) and these conical lateral surface sections (11) of the ribs (8) merge into the rounded bottoms of the grooves (7), forming a kink line (12).
2. Drehmomentübertragungseinrichtung nach Anspruch 1 oder insbesondere danach, dadurch gekennzeichnet, dass der Winkel (α) der Grundlinie (10) und der Winkel (ß) der Scheitellinie (9) zur Achse (M) des Profilabschnittes (2) verschieden sind. 2. Torque transmission device according to claim 1 or in particular according thereto, characterized in that the angle (α) of the base line (10) and the angle (β) of the apex line (9) to the axis (M) of the profile section (2) are different.
3. Drehmomentübertragungseinrichtung nach einem oder mehreren der vorhergehenden Ansprüche oder insbesondere danach, dadurch gekennzeichnet, dass der Winkel (α) der Grundlinie (10) größer ist als der Winkel (ß) der Scheitellinie (9).3. Torque transmission device according to one or more of the preceding claims or in particular according thereto, characterized in that the angle (α) of the base line (10) is greater than the angle (β) of the apex line (9).
4. Drehmomentübertragungseinrichtung nach einem oder mehreren der vorhergehenden Ansprüche oder insbesondere danach, dadurch gekennzeichnet, dass der Winkel (α) der Grundlinie (10) je nach Durchmesser der des Profilabschnittes (2) zwischen 1,5 und 3 Grad beträgt.4. Torque transmission device according to one or more of the preceding claims or in particular according thereto, characterized in that the angle (α) of the base line (10) is between 1.5 and 3 degrees depending on the diameter of the profile section (2).
5. Drehmomentübertragungseinrichtung nach einem oder mehreren der vorhergehenden Ansprüche oder insbesondere danach, dadurch gekennzeichnet, dass der Winkel (ß) der Scheitellinie (10) je nach Durchmesser des Profilabschnittes (2) zwischen 2,5 und 5,5 Grad beträgt.5. Torque transmission device according to one or more of the preceding claims or in particular according thereto, characterized in that the angle (β) of the apex line (10) is between 2.5 and 5.5 degrees depending on the diameter of the profile section (2).
6. Drehmomentübertragungseinrichtung nach einem oder mehreren der vorhergehenden Ansprüche oder insbesondere danach, dadurch gekennzeichnet, dass der Querschnitt des Nutgrundes (7) auf einer Kreisbogenlinie verläuft.6. Torque transmission device according to one or more of the preceding claims or in particular according thereto, characterized in that the cross section of the groove base (7) runs on a circular arc line.
7. Drehmomentübertragungseinrichtung nach einem oder mehreren der vorhergehenden Ansprüche oder insbesondere danach, dadurch gekennzeichnet, dass die in Umfangsrichtung gemessene Breite der durch die Knicklinien (12) begrenzten Kegelmantelflächenabschnitte (11) von der Stirnseite (21) des Profilabschnittes (2) ausgehend derartig ansteigt, dass sie im Endbereich der in die Einstecköffnung (3) eintauchenden Zone (L) des Profilabschnittes (2) ein Maß erreicht, welches dem dortigen Abstande der Einstecköffnungswandabschnitte entspricht. 7. Torque transmission device according to one or more of the preceding claims or in particular according thereto, characterized in that the width measured in the circumferential direction of the conical lateral surface sections (11) delimited by the fold lines (12) increases in such a manner starting from the end face (2 1 ) of the profile section (2) that it reaches a dimension in the end region of the zone (L) of the profile section (2) immersed in the insertion opening (3) which corresponds to the distance between the insertion opening wall sections there.
8. Schraubwerkzeug mit einem Profilabschnitt (2) zum formschlüssigen Eingriff in eine im Wesentlichen zylinderförmige Einstecköffnung (3) eines Schraubenkopfes (4), wobei der Profilabschnitt (2) eine Anzahl von je einem gerundeten Boden aufweisende Nuten (7) und zwischen den Nuten (7) sich erstreckenden Rippen (8) aufweist, wobei die Scheitellinien (9) der Rippen (8) bzw. die Grundlinien (10) der Nuten (7) spitzwinklig zur Achsrichtung des Profilabschnittes verlaufen, dadurch gekennzeichnet, dass radial nach außen weisende Abschnitte der Rippen (8) auf einer Kegelstumpfmantelfläche um die Achse (M) des Profilabschnittes (2) verlaufen und diese Kegelmantelflächenabschnitte (11) der Rippen (8), unter Ausbildung einer Knicklinie (12) in die gerundeten Böden der Nuten (7) übergehen.8. Screwing tool with a profile section (2) for positive engagement in an essentially cylindrical insertion opening (3) of a screw head (4), the profile section (2) having a number of grooves (7) each with a rounded bottom and between the grooves ( 7) extending ribs (8), the apex lines (9) of the ribs (8) or the base lines (10) of the grooves (7) being at an acute angle to the axial direction of the profile section, characterized in that radially outwardly pointing sections of the Ribs (8) run on a truncated cone surface around the axis (M) of the profile section (2) and these conical surface surface sections (11) of the ribs (8) merge into the rounded bottoms of the grooves (7), forming a crease line (12).
9. Schraubwerkzeug nach Anspruch 8 oder insbesondere danach, gekennzeichnet durch eine Ausgestaltung des Profilabschnittes (2) gemäß einem oder mehreren der Ansprüche 2 bis 7. 9. Screwing tool according to claim 8 or in particular according thereto, characterized by an embodiment of the profile section (2) according to one or more of claims 2 to 7.
EP06708629.8A 2005-03-11 2006-03-03 Torque transmitting device with press fit between the driving and driven parts, particularly a screwdriver Not-in-force EP1858670B1 (en)

Applications Claiming Priority (2)

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DE102005011734A DE102005011734A1 (en) 2005-03-11 2005-03-11 Torque transmission device, in particular screwing tool
PCT/EP2006/060440 WO2006094940A1 (en) 2005-03-11 2006-03-03 Torque transmitting device with press fit between the driving and driven parts, particularly a screwdriver

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EP1858670A1 true EP1858670A1 (en) 2007-11-28
EP1858670B1 EP1858670B1 (en) 2015-02-25

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