DE102007004970A1 - Thread grooving screw, has circular thread section connected at trilobular thread section, where diameter of cladding circle of trilobular thread section is formed larger than diameter of circular thread section - Google Patents

Thread grooving screw, has circular thread section connected at trilobular thread section, where diameter of cladding circle of trilobular thread section is formed larger than diameter of circular thread section Download PDF

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Publication number
DE102007004970A1
DE102007004970A1 DE200710004970 DE102007004970A DE102007004970A1 DE 102007004970 A1 DE102007004970 A1 DE 102007004970A1 DE 200710004970 DE200710004970 DE 200710004970 DE 102007004970 A DE102007004970 A DE 102007004970A DE 102007004970 A1 DE102007004970 A1 DE 102007004970A1
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DE
Germany
Prior art keywords
thread section
trilobular
thread
diameter
circular
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
DE200710004970
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German (de)
Inventor
Hans-Jürgen Wißmeier
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.)
ESKA AUTOMOTIVE GmbH
Original Assignee
ESKA AUTOMOTIVE GmbH
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Filing date
Publication date
Application filed by ESKA AUTOMOTIVE GmbH filed Critical ESKA AUTOMOTIVE GmbH
Priority to DE200710004970 priority Critical patent/DE102007004970A1/en
Publication of DE102007004970A1 publication Critical patent/DE102007004970A1/en
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
    • F16B25/001—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by the material of the body into which the screw is screwed
    • F16B25/0021—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by the material of the body into which the screw is screwed the material being metal, e.g. sheet-metal or aluminium
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
    • F16B25/0036—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw
    • F16B25/0042—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw characterised by the geometry of the thread, the thread being a ridge wrapped around the shaft of the screw
    • F16B25/0057—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw characterised by the geometry of the thread, the thread being a ridge wrapped around the shaft of the screw the screw having distinct axial zones, e.g. multiple axial thread sections with different pitch or thread cross-sections
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B35/00—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws
    • F16B35/04—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws with specially-shaped head or shaft in order to fix the bolt on or in an object
    • F16B35/041—Specially-shaped shafts

Abstract

The grooving screw (1) has a head (2), a shank (3) and a trilobular thread section (5) provided at a free end (4) of the shank. A circular thread section (6) is connected at the trilobular thread section. A diameter of a cladding circle of the trilobular thread section is formed larger than a diameter of the circular thread section that contains a metric thread. The circular thread section lies slightly over a flexible resilience of a formed internal thread, which is produced by the trilobular thread section of the screw.

Description

Gewindefurchende Schraube mit einem Kopf und einem Schaft sowie einem am freien Ende des Schaftes vorgesehenen trilobularen Gewindeabschnitt, an den sich ein zirkularer Gewindeabschnitt anschließt. Mit einer derartigen Schraube kann durch einen Formvorgang in einer Mutter- oder Kernbohrung eines Bauteiles ein Innengewinde ausgebildet werden.Self-tapping Screw with a head and a shaft and one at the free end provided the shaft trilobular threaded section, to the a circular thread section connects. With a such screw can be made by a molding process in a parent or core hole of a component an internal thread can be formed.

Eine derartige Schraube ist aus der DE 33 32 570 A1 bekannt. Dabei ist der trilobulare Gewindeabschnitt (im Querschnitt dreiseitiges Gleichdick) am Ende des Schaftes in Richtung des Kopfes der Schraube ansteigend ausgebildet, wobei dessen Gewindequerschnitte (Hüllkreise) sich kontinuierlich entlang des Schaftes im Durchmesser vergrößern oder gleich bleiben, aber gegenüber dem sich anschließenden zirkularen Gewindeabschnitt mit geringerem oder gleichem Durchmesser ausgebildet sind. Durch den trilobularen Gewindeabschnitt wird beim Eindrehen der Schraube in das Bauteil ihr Gegengewinde spanlos geformt, indem eine Materialverdrängung durch Kaltumformung erfolgt, durch die das Material der Kernbohrung die Gewindeflanken der Schraube umfließt. Somit ist die Schraube durch die Klemmkraft ihres tragenden trilobularen Gewindeumfangs in der Lage, sich in dem von ihr in einer Mutter- oder Kernbohrung gefurchten Gegengewinde selbst zu sichern.Such a screw is from the DE 33 32 570 A1 known. In this case, the trilobular threaded portion (in cross-section three-sided equal thickness) at the end of the shaft in the direction of the head of the screw rising, the thread cross-sections (enveloping circles) increase continuously along the shaft in diameter or remain the same, but with respect to the subsequent circular threaded portion with are formed smaller or the same diameter. Due to the trilobular thread section, when the screw is screwed into the component, its mating thread is formed without cutting, by material displacement by cold forming, through which the material of the core bore flows around the thread flanks of the screw. Thus, by the clamping force of its supporting trilobular thread periphery, the screw is able to secure itself in the mating thread furrowed by it in a nut or core bore.

Nachteilig wirkt sich bei dieser Lösung aus, dass sich beim Furchen des Gegengewindes das erforderliche Eindrehmoment (Furchmoment, Montagemoment) mit der Einschraubtiefe der Schraube deshalb erhöht, weil der Reibanteil entsprechend ansteigt. Dabei erfolgt zunächst ein steiler Kraftanstieg, bis der gesamte trilobulare Gewindeabschnitt in die Mutter- oder Kernbohrung eingedrungen ist. In der Folge wird das nunmehr konstante Furchmoment überlagert von der ansteigenden Gewindereibung des nicht furchenden zirkularen Gewindeabschnitts. Anschließend stellt sich erneut ein steiler Kraftanstieg ein, wenn der Kopf der Schraube auf dem Bauteil zur Anlage kommt. Dadurch verringert sich bei großen Einschraubtiefen zwangsläufig der Spielraum zwischen Furch- und Überdrehmoment, wodurch die Verwendung derartiger Schrauben, insbesondere in Verbindung mit Bauteilen aus Leichtmetall, eingeschränkt ist. Außerdem kann die Gewindereibung so hoch werden, dass bei Montagearbeiten ein sicheres Einstellen einer vorgegebenen Vorspannkraft nicht ermöglicht wird. Im Extremfall nimmt die Reibung einen solchen Wert an, dass das voreingestellte Eindrehmoment schon erreicht wird, bevor der Kopf der Schraube mit dem Bauteil zur Anlage zur Anlage kommt. Damit ist das Einsatzgebiet dieser Schrauben u. a. im Rahmen automatischer Montagearbeiten wesentlich eingeschränkt.adversely This solution affects that when furrows the counter-thread the required insertion torque (furrow torque, Mounting torque) with the screwing depth of the screw therefore increased because the friction component increases accordingly. This is done first a steep force increase until the entire trilobular threaded section has penetrated into the mother or core hole. In the episode will the now constant furrow moment superimposed by the rising Thread friction of the non-furrowing circular threaded portion. Subsequently again, a steep increase in force occurs when the head of the Screw on the component comes to rest. This reduces For large screw-in depth inevitably the scope between Furrow and over torque, whereby the use of such Screws, in particular in connection with components of light metal, is restricted. In addition, the thread friction so high that during assembly work a safe setting a predetermined biasing force is not possible. In extreme cases, the friction assumes such a value that the pre-set torque is already reached before the head the screw with the component comes to the plant to the plant. In order to is the field of application of these screws u. a. in the context of automatic Installation work significantly restricted.

Die Aufgabe der Erfindung besteht darin, eine Schraube vorzuschlagen, die beim Gewindefurchen nur ein geringes Eindrehmoment erfordert.The The object of the invention is to propose a screw, which requires only a small insertion torque when threading.

Diese Aufgabe wird bei einer gattungsgemäßen Schraube mit den im Kennzeichen des Patentanspruchs 1 angegebenen Merkmalen gelöst.These Task is in a generic screw with the features specified in the characterizing part of patent claim 1 solved.

Die Vorteile der Erfindung bestehen darin, dass nach dem vollen Eingriff des trilobularen Gewindeabschnitts des Schaftes nur ein niedriges, von der Einschraubtiefe unabhängiges und damit konstantes Montagemoment erforderlich ist, so dass sich auch die Verwendung derartiger Schrauben für Leichtmetallteile oder Bauteile mit großer Einschraubtiefe sowie für automatische Montagearbeiten anbietet. Dies kann dadurch gewährleistet werden, dass der zirkulare Gewindeabschnitt durch seinen gegenüber dem Durchmesser des Hüllkreises des trilobularen Gewindeabschnitts verringerten Durchmesser keine zusätzliche Reibkomponente bewirkt. Durch die größtmögliche Differenz zwischen Eindrehmoment (= Furchmoment, Montagemoment) und Überdrehmoment, bei maximal möglichem Traganteil des zirkularen Gewindeabschnitts, kann ein definiertes drehmomenten- oder drehwinkelgesteuertes Vorspannen der Schraubverbindung erfolgen.The Advantages of the invention are that after the full engagement of the trilobular threaded section of the shank only a low, independent of the screwing depth and thus constant mounting torque is necessary, so that also the use of such screws for light metal parts or components with large ones Screwing depth and for automatic assembly work offering. This can be guaranteed by the fact that the circular threaded portion by its opposite to the diameter of the enveloping circle of the trilobular thread section Diameter causes no additional friction component. By the largest possible difference between Insertion torque (= torque, assembly torque) and over-torque, at maximum possible carrying portion of the circular threaded portion, a defined torque or angle controlled biasing the Screw connection done.

Vorteilhafte Weiterbildungen der Erfindung gehen aus den Patentansprüchen 2 und 3 hervor.advantageous Further developments of the invention are based on the patent claims 2 and 3.

Die Erfindung soll nachfolgend an einem Ausführungsbeispiel und zugehörigen Zeichnungen näher erläutert werden.The Invention is intended below to an embodiment and associated drawings explained in more detail become.

Es zeigen:It demonstrate:

1 eine Seitenansicht der erfindungsgemäßen Schraube 1 a side view of the screw according to the invention

2 eine Schnittdarstellung des trilobularen Gewindeabschnitts der Schraube entlang der Linie A-B der 1 2 a sectional view of the trilobular threaded portion of the screw along the line AB of 1

3 eine Schnittdarstellung des zirkularen Gewindeabschnitts der Schraube entlang der Linie C-D der 1 3 a sectional view of the circular threaded portion of the screw along the line CD of 1

In der 1 ist eine gewindefurchende Schraube 1 mit einem Kopf 2 und einem Schaft 3 sowie einem am freien Ende 4 des Schaftes 3 vorgesehenen trilobularen Gewindeabschnitt 5 dargestellt, an den sich ein zirkularer Gewindeabschnitt 6 anschließt. Dieser zirkulare Gewindeabschnitt 6 beinhaltet vorzugsweise ein metrisches Gewinde. Dabei ist der Durchmesser D1 des Hüllkreises 7 des trilobularen Gewindeabschnitts 5 größer als der Durchmesser D2 des sich in Richtung des Kopfes 2 der Schraube 1 anschließenden zirkularen Gewindeabschnitts 6 ausgebildet. Ist beispielhaft der zirkulare Gewindeabschnitt 6 mit einem metrischen Gewinde M10 ausgestattet, dessen Außerdurchmesser D2 = 10 mm beträgt, dann ist diesem ein trilobularer Gewindeabschnitt 5 beigeordnet, dessen Hüllkreis 7 einen Durchmesser D1= 10,15 mm umfasst. Diese Durchmesservergrößerung D = D1 – D2 = 10,15 mm – 10,00 mm = 0,15 mm liegt somit geringfügig über der materialeigenen elastischen Rückfederung des profilgewalzten Innengewindes, welches vom trilobularen Gewindeabschnitt 5 der Schraube 1 furchend in der Mutter- oder Kernbohrung des korrespondierenden Bauteiles erzeugt wird.In the 1 is a thread-forming screw 1 with a head 2 and a shaft 3 as well as one at the free end 4 of the shaft 3 provided trilobular threaded section 5 shown, to which a circular threaded portion 6 followed. This circular threaded section 6 preferably includes a metric thread. In this case, the diameter D 1 of the enveloping circle 7 of the trilobular threaded section 5 greater than the diameter D 2 of the direction of the head 2 the screw 1 subsequent circular threaded portion 6 educated. Is exemplary of the circular thread Ab cut 6 equipped with a metric thread M10, whose outside diameter D 2 = 10 mm, then this is a trilobular thread section 5 coordinated, whose outer circle 7 a diameter D 1 = 10.15 mm. This diameter increase D = D 1 -D 2 = 10.15 mm - 10.00 mm = 0.15 mm is thus slightly above the material's own elastic resilience of the profile-rolled internal thread, which from the trilobular threaded section 5 the screw 1 grooved in the nut or core hole of the corresponding component is generated.

11
Schraubescrew
22
Kopfhead
33
Schaftshaft
44
freies Endefree The End
55
trilobularer Gewindeabschnitttrilobular threaded portion
66
zirkularer Gewindeabschnittcircular threaded portion
77
Hüllkreisenveloping circle
D1 D 1
Durchmesser von 7 diameter of 7
D2 D 2
Durchmesser von 6 diameter of 6
DV D V
DurchmesservergrößerungIncrease in diameter

ZITATE ENTHALTEN IN DER BESCHREIBUNGQUOTES INCLUDE IN THE DESCRIPTION

Diese Liste der vom Anmelder aufgeführten Dokumente wurde automatisiert erzeugt und ist ausschließlich zur besseren Information des Lesers aufgenommen. Die Liste ist nicht Bestandteil der deutschen Patent- bzw. Gebrauchsmusteranmeldung. Das DPMA übernimmt keinerlei Haftung für etwaige Fehler oder Auslassungen.This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Zitierte PatentliteraturCited patent literature

  • - DE 3332570 A1 [0002] - DE 3332570 A1 [0002]

Claims (3)

Gewindefurchende Schraube mit einem Kopf und einem Schaft sowie einem am freien Ende des Schaftes vorgesehenen trilobularen Gewindeabschnitt, an den sich ein zirkularer Gewindeabschnitt anschließt, dadurch gekennzeichnet, dass der Durchmesser (D1) des Hüllkreises (7) des trilobularen Gewindeabschnitts (5) größer als der Durchmesser (D2) des sich anschließenden zirkularen Gewindeabschnitts (6) ausgebildet ist.Thread-forming screw having a head and a shank and a trilobular threaded section provided at the free end of the shank, to which a circular thread section adjoins, characterized in that the diameter (D 1 ) of the enveloping circle ( 7 ) of the trilobular threaded section ( 5 ) greater than the diameter (D 2 ) of the subsequent circular threaded portion ( 6 ) is trained. Gewindefurchende Schraube nach Patentanspruch 1, dadurch gekennzeichnet, dass der zirkulare Gewindeabschnitt (6) ein metrisches Gewinde beinhaltet.Thread-forming screw according to claim 1, characterized in that the circular threaded portion ( 6 ) includes a metric thread. Gewindefurchende Schraube nach Patentanspruch 1, dadurch gekennzeichnet, das der Durchmesser (D1) des Hüllkreises (7) des trilobularen Gewindeabschnitts (5) um einen Betrag größer als der Durchmesser (D2) des zirkularen Gewindeabschnitts (5) ausgestaltet ist, der geringfügig über der materialeigenen elastischen Rückfederung des geformten Innengewindes liegt, welches vom trilobularen Gewindeabschnitt (5) der Schraube (1) furchend in der Mutter- oder Kernbohrung des korrespondierenden Bauteiles erzeugt wird.Thread-forming screw according to claim 1, characterized in that the diameter (D 1 ) of the enveloping circle ( 7 ) of the trilobular threaded section ( 5 ) by an amount greater than the diameter (D 2 ) of the circular threaded portion ( 5 ), which is slightly above the material's own elastic resilience of the molded internal thread, which of the trilobular threaded portion ( 5 ) of the screw ( 1 ) is produced furrowing in the nut or core bore of the corresponding component.
DE200710004970 2007-01-26 2007-01-26 Thread grooving screw, has circular thread section connected at trilobular thread section, where diameter of cladding circle of trilobular thread section is formed larger than diameter of circular thread section Ceased DE102007004970A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE200710004970 DE102007004970A1 (en) 2007-01-26 2007-01-26 Thread grooving screw, has circular thread section connected at trilobular thread section, where diameter of cladding circle of trilobular thread section is formed larger than diameter of circular thread section

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200710004970 DE102007004970A1 (en) 2007-01-26 2007-01-26 Thread grooving screw, has circular thread section connected at trilobular thread section, where diameter of cladding circle of trilobular thread section is formed larger than diameter of circular thread section

Publications (1)

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DE102007004970A1 true DE102007004970A1 (en) 2008-08-07

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DE200710004970 Ceased DE102007004970A1 (en) 2007-01-26 2007-01-26 Thread grooving screw, has circular thread section connected at trilobular thread section, where diameter of cladding circle of trilobular thread section is formed larger than diameter of circular thread section

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014007039A1 (en) * 2014-05-14 2015-11-19 Sfs Intec Holding Ag Fastening arrangement, screw for a fastening arrangement and use of a screw in a fastening arrangement

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3332570A1 (en) 1983-09-09 1985-03-28 Friedr. Boesner GmbH, 5450 Neuwied METHOD FOR PRODUCING SELF-SHAPING AND SELF-LOCKING SCREWS WITH ADDITIONAL SEALING AND / OR SETTING PROPERTIES

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3332570A1 (en) 1983-09-09 1985-03-28 Friedr. Boesner GmbH, 5450 Neuwied METHOD FOR PRODUCING SELF-SHAPING AND SELF-LOCKING SCREWS WITH ADDITIONAL SEALING AND / OR SETTING PROPERTIES

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014007039A1 (en) * 2014-05-14 2015-11-19 Sfs Intec Holding Ag Fastening arrangement, screw for a fastening arrangement and use of a screw in a fastening arrangement

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