DE102022102636A1 - belt tensioner - Google Patents

belt tensioner Download PDF

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Publication number
DE102022102636A1
DE102022102636A1 DE102022102636.1A DE102022102636A DE102022102636A1 DE 102022102636 A1 DE102022102636 A1 DE 102022102636A1 DE 102022102636 A DE102022102636 A DE 102022102636A DE 102022102636 A1 DE102022102636 A1 DE 102022102636A1
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DE
Germany
Prior art keywords
belt
screw
base part
tensioning lever
lever
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
DE102022102636.1A
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German (de)
Inventor
Tibor Měrka
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.)
Schaeffler Technologies AG and Co KG
Original Assignee
Schaeffler Technologies AG 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
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Priority to DE102022102636.1A priority Critical patent/DE102022102636A1/en
Publication of DE102022102636A1 publication Critical patent/DE102022102636A1/en
Ceased legal-status Critical Current

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    • 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
    • F16H—GEARING
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/08—Means for varying tension of belts, ropes, or chains
    • 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
    • F16H—GEARING
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/08—Means for varying tension of belts, ropes, or chains
    • F16H7/10—Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley
    • F16H7/12—Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley of an idle pulley
    • F16H7/1209—Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley of an idle pulley with vibration damping means
    • 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
    • F16H—GEARING
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/08—Means for varying tension of belts, ropes, or chains
    • F16H7/10—Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley
    • F16H7/12—Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley of an idle pulley
    • F16H7/1254—Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley of an idle pulley without vibration damping means
    • F16H7/1281—Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley of an idle pulley without vibration damping means where the axis of the pulley moves along a substantially circular path
    • 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
    • F16H—GEARING
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/08—Means for varying tension of belts, ropes, or chains
    • F16H2007/0802—Actuators for final output members
    • F16H2007/081—Torsion springs
    • 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
    • F16H—GEARING
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/08—Means for varying tension of belts, ropes, or chains
    • F16H2007/0863—Finally actuated members, e.g. constructional details thereof
    • F16H2007/0865—Pulleys
    • 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
    • F16H—GEARING
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/08—Means for varying tension of belts, ropes, or chains
    • F16H2007/0889—Path of movement of the finally actuated member
    • F16H2007/0893—Circular path

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)

Abstract

Vorgeschlagen ist ein Riemenspanner (1) zum Vorspannen des Riemens eines Riementriebs einer Brennkraftmaschine und ein Verfahren zur Herstellung des Riemenspanners, der umfasst:- ein an der Brennkraftmaschine befestigtes Basisteil (2),- einen gegenüber dem Basisteil drehbar gelagerten Spannhebel (3) mit einer vom Riemen umschlungenen Spannrolle (4), die mittels einer Schraube (10) auf dem Spannhebel befestigt ist,- und eine zwischen dem Basisteil und dem Spannhebel eingespannte Drehfeder (7), deren Federdrehmoment die Riemenvorspannung erzeugt.Der Schraubenkopf (9) der Schraube dient als Eingriffskontur für ein Montagewerkzeug, das bei der Montage des Riemens in den Riementrieb den Spannhebel unter Erhöhung des Federdrehmoments gegenüber dem Basisteil verdreht. Dabei soll das Außengewinde der Schraube im Innengewinde des Spannhebels unter Bildung einer Schraubensicherung plastisch verformt sein.A belt tensioner (1) for pretensioning the belt of a belt drive of an internal combustion engine and a method for producing the belt tensioner is proposed, which comprises: - a base part (2) attached to the internal combustion engine, - a tensioning lever (3) which is rotatably mounted relative to the base part and has a tensioning roller (4) wrapped around the belt, which is fastened to the tensioning lever by means of a screw (10), and a torsion spring (7) clamped between the base part and the tensioning lever, the spring torque of which generates the belt pretension. The screw head (9) is used for the screw as an engagement contour for an assembly tool, which twists the tensioning lever in relation to the base part while assembling the belt in the belt drive, increasing the spring torque. The external thread of the screw should be plastically deformed in the internal thread of the clamping lever to form a screw lock.

Description

Die Erfindung betrifft einen Riemenspanner zum Vorspannen des Riemens eines Riementriebs einer Brennkraftmaschine und ein Verfahren zur Herstellung des Riemenspanners. Dieser umfasst:

  • - ein an der Brennkraftmaschine befestigtes Basisteil,
  • - einen gegenüber dem Basisteil drehbar gelagerten Spannhebel mit einer vom Riemen umschlungenen Spannrolle, die mittels einer Schraube auf dem Spannhebel befestigt ist,
  • - und eine zwischen dem Basisteil und dem Spannhebel eingespannte Drehfeder, deren Federdrehmoment die Riemenvorspannung erzeugt,
wobei der Schraubenkopf der Schraube als Eingriffskontur für ein Montagewerkzeug dient, das bei der Montage des Riemens in den Riementrieb den Spannhebel unter Erhöhung des Federdrehmoments gegenüber dem Basisteil verdreht.The invention relates to a belt tensioner for pretensioning the belt of a belt drive of an internal combustion engine and a method for producing the belt tensioner. This includes:
  • - a base part attached to the internal combustion engine,
  • - a tensioning lever which is rotatably mounted relative to the base part and has a tensioning roller around which the belt is wrapped and which is fastened to the tensioning lever by means of a screw,
  • - and a torsion spring clamped between the base part and the tensioning lever, whose spring torque generates the belt pretension,
wherein the screw head of the screw serves as an engagement contour for an assembly tool which, during assembly of the belt in the belt drive, rotates the tensioning lever in relation to the base part, increasing the spring torque.

Ein derartiger Riemenspanner ist aus der US 6 458 055 B1 bekannt.Such a belt tensioner is from U.S. 6,458,055 B1 known.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, einen Riemenspanner der eingangs genannten Art und dessen Herstellverfahren mit einer konstruktiv verbesserten Verschraubung der Spannrolle am Spannhebel anzugeben.The present invention is based on the object of specifying a belt tensioner of the type mentioned at the outset and its manufacturing method with a structurally improved screw connection of the tensioning roller to the tensioning lever.

Die Lösung dieser Aufgabe ergibt sich durch die Merkmale des Vorrichtungsanspruchs 1 und des Verfahrensanspruchs 2. Demnach soll das Außengewinde der Schraube im Innengewinde des Spannhebels unter Bildung einer Schraubensicherung plastisch verformt sein. Bei dem zugehörigen Herstellverfahren des Riemenspanners wird das Außengewinde durch Verstemmen der Schraube plastisch verformt.The solution to this problem results from the features of the device claim 1 and the method claim 2. Accordingly, the external thread of the screw should be plastically deformed in the internal thread of the clamping lever, forming a screw lock. In the associated manufacturing process of the belt tensioner, the external thread is plastically deformed by caulking the screw.

Die erfindungsgemäße Schraubensicherung ist eine in der Herstellung vorteilhafte Alternative zum Auftrag flüssiger Schraubensicherungsmittel und bewirkt bei üblicher Verwendung eines Rechtsgewindes (alternativ ist ein Linksgewinde möglich) Folgendes:

  • - Das Lösen der Verschraubung wird verhindert, falls das Montagewerkzeug den Spannhebel linksherum verdreht.
  • - Das Überdrehen der Verschraubung im Sinne eines überhöhten Anzugsmoments wird verhindert, falls das Montagewerkzeug den Spannhebel rechtsherum verdreht.
The screw locking device according to the invention is an alternative to the application of liquid screw locking agents that is advantageous in production and has the following effects when a right-hand thread is used normally (a left-hand thread is alternatively possible):
  • - The screw connection is prevented from loosening if the assembly tool turns the clamping lever to the left.
  • - Overtightening of the screw connection in the sense of an excessive tightening torque is prevented if the assembly tool turns the clamping lever to the right.

Weitere Merkmale und Ausgestaltungen der Erfindung ergeben sich aus der nachfolgenden Beschreibung und aus der Zeichnung, in der ein erfindungsgemäßer Riemenspanner für einen Nebenaggregate-Riementrieb einer Brennkraftmaschine im Längsschnitt dargestellt ist.Further features and refinements of the invention result from the following description and from the drawing, in which a belt tensioner according to the invention for an auxiliary unit belt drive of an internal combustion engine is shown in longitudinal section.

Der in der einzigen Figur dargestellte Riemenspanner 1, der den Riemen eines Nebenaggregate-Riementriebs einer Brennkraftmaschine vorspannt, umfasst ein an der Brennkraftmaschine befestigtes Basisteil 2 und einen demgegenüber drehbar gelagerten Spannhebel 3 mit einer vom Riemen umschlungenen Spannrolle 4. Die Befestigung des Basisteils 2 erfolgt mittels einer Schraubverbindung mit einer nicht dargestellten Schraube, die einen Teil des Basisteils 2 bildenden Lagerbolzen 5 durchsetzt.The belt tensioner 1 shown in the single figure, which pretensions the belt of an auxiliary unit belt drive of an internal combustion engine, comprises a base part 2 attached to the internal combustion engine and a tensioning lever 3, which is rotatably mounted in relation to it, with a tensioning roller 4 looped around by the belt. The base part 2 is attached by means of a screw connection with a screw, not shown, which penetrates a part of the base part 2 forming the bearing pin 5.

Das Drehlager des Spannhebels 3 gegenüber dem Basisteil 2 wird durch eine aus einem Polyamidwerkstoff bestehende Bundbuchse 6 gebildet, die axial und radial zwischen dem Spannhebel 3 und dem Lagerbolzen 5 eingespannt ist.The pivot bearing of the clamping lever 3 relative to the base part 2 is formed by a collar bushing 6 made of a polyamide material, which is clamped axially and radially between the clamping lever 3 and the bearing pin 5 .

Die Riemenvorspannung wird durch das Drehmoment einer Drehfeder 7 erzeugt, die zwischen dem Basisteil 2 und dem Spannhebel 3 sowohl in Umfangs- als auch in Axialrichtung eingespannt ist, wobei die Axialkraft der Drehfeder 7 die Bundbuchse 6 zwischen dem Spannhebel 3 und dem Lagerbolzen 5 axial einspannt.The belt pretension is generated by the torque of a torsion spring 7, which is clamped between the base part 2 and the clamping lever 3 in both the circumferential and axial directions, with the axial force of the torsion spring 7 clamping the collar bushing 6 between the clamping lever 3 and the bearing bolt 5 axially .

Die Spannrolle 4 ist auf dem Spannhebel 3 mittels eines einreihigen Kugellagers 8 gelagert, dessen Innenring zwischen dem Schraubenkopf 9 einer in den Spannhebel 3 eingeschraubten Schraube 10 und dem Spannhebel 3 befestigt ist. Die Schraube 10 hat einen Innentorx 11, der als Eingriffskontur sowohl für den Eingriff eines die Schraube 10 in den Spannhebel 3 eindrehenden Schraubwerkzeugs als auch für den Eingriff eines Montagewerkzeugs dient, das bei der Montage des Riemens in den Riementrieb den Spannhebel 3 unter weiterer Erhöhung des Federdrehmoments gegenüber dem Basisteil 2 so verdreht, dass die Spannrolle 4 das Auflegen des Riemens nicht behindert.The tensioning roller 4 is mounted on the tensioning lever 3 by means of a single-row ball bearing 8 whose inner ring is fastened between the screw head 9 of a screw 10 screwed into the tensioning lever 3 and the tensioning lever 3 . The screw 10 has an inner torx 11, which serves as an engagement contour both for the engagement of a screwing tool that screws the screw 10 into the tensioning lever 3 and for the engagement of an assembly tool that, during assembly of the belt in the belt drive, tightens the tensioning lever 3 while further increasing the Spring torque relative to the base part 2 twisted so that the tensioning roller 4 does not impede the placement of the belt.

Bei der Montage des Riemens wird ein Lösen bzw. ein übermäßiges Anziehen dieser Schraubverbindung durch eine Schraubensicherung verhindert, die erfindungsgemäß durch plastische Verformung des im Innengewinde des Spannhebels 3 eingeschraubten Außengewindes der Schraube 10 hergestellt ist und das zum Lösen bzw. weiteren Anziehen der Verschraubung erforderliche Drehmoment deutlich erhöht. Die Schraube 10 kann selbstfurchend sein, so dass das Innengewinde des Spannhebels 3 erst beim Eindrehen der Schraube 10 hergestellt wird. Das plastische Verformen erfolgt durch stirnseitiges Verstemmen der Schraube 10 mittels eines in der Figur schematisch eingezeichneten Stempels 12, der nach dem Eindrehen der Schraube 10 in den Spannhebel 3 das Außengewinde plastisch verformt (symbolisiert durch die dort eingezeichneten Pfeile) und so gegen Lösen bzw. Überdrehen im Innengewinde des Spannhebels 3 form- und kraftschlüssig sichert.During assembly of the belt, loosening or excessive tightening of this screw connection is prevented by a screw lock, which according to the invention is produced by plastic deformation of the external thread of screw 10 screwed into the internal thread of tensioning lever 3 and the torque required to loosen or further tighten the screw connection clearly increased. The screw 10 can be self-tapping, so that the internal thread of the clamping lever 3 is only produced when the screw 10 is screwed in. The plastic deformation takes place by caulking the screw 10 at the end face by means of a die shown schematically in the figure 12, which plastically deforms the external thread after the screw 10 has been screwed into the clamping lever 3 (symbolized by the arrows drawn there) and thus secures the internal thread of the clamping lever 3 against loosening or over-tightening in a positive and non-positive manner.

ZITATE ENTHALTEN IN DER BESCHREIBUNGQUOTES INCLUDED IN 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 of documents cited by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Zitierte PatentliteraturPatent Literature Cited

  • US 6458055 B1 [0002]US6458055B1 [0002]

Claims (2)

Riemenspanner (1) zum Vorspannen des Riemens eines Riementriebs einer Brennkraftmaschine, umfassend: - ein an der Brennkraftmaschine befestigtes Basisteil (2), - einen gegenüber dem Basisteil (2) drehbar gelagerten Spannhebel (3) mit einer vom Riemen umschlungenen Spannrolle (4), die mittels einer Schraube (10) auf dem Spannhebel (3) befestigt ist, - und eine zwischen dem Basisteil (2) und dem Spannhebel (3) eingespannte Drehfeder (7), deren Federdrehmoment die Riemenvorspannung erzeugt, wobei der Schraubenkopf (9) der Schraube (10) als Eingriffskontur für ein Montagewerkzeug dient, das bei der Montage des Riemens in den Riementrieb den Spannhebel (3) unter Erhöhung des Federdrehmoments gegenüber dem Basisteil (2) verdreht, dadurch gekennzeichnet, dass das Außengewinde der Schraube (10) im Innengewinde des Spannhebels (3) unter Bildung einer Schraubensicherung plastisch verformt ist.Belt tensioner (1) for pretensioning the belt of a belt drive of an internal combustion engine, comprising: - a base part (2) fastened to the internal combustion engine, - a tensioning lever (3) which is rotatably mounted relative to the base part (2) and has a tensioning roller (4) looped around by the belt, which is fastened to the tensioning lever (3) by means of a screw (10), - and a torsion spring (7) clamped between the base part (2) and the tensioning lever (3), the spring torque of which generates the belt pretension, the screw head (9) being the The screw (10) serves as an engagement contour for an assembly tool which, during assembly of the belt in the belt drive, rotates the tensioning lever (3) while increasing the spring torque in relation to the base part (2), characterized in that the external thread of the screw (10) is in the internal thread of the clamping lever (3) is plastically deformed to form a screw lock. Verfahren zur Herstellung eines Riemenspanners (1) gemäß Anspruch 1, dadurch gekennzeichnet, dass das Außengewinde durch Verstemmen der Schraube (10) plastisch verformt wird.Method for manufacturing a belt tensioner (1) according to claim 1 , characterized in that the external thread is plastically deformed by caulking the screw (10).
DE102022102636.1A 2022-02-04 2022-02-04 belt tensioner Ceased DE102022102636A1 (en)

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DE102022102636.1A DE102022102636A1 (en) 2022-02-04 2022-02-04 belt tensioner

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3925876A (en) 1974-03-26 1975-12-16 Trw Inc Method of joining bolts or rivets to nuts
US6458055B1 (en) 1999-04-12 2002-10-01 Litens Automotive Reversible tensioner
DE10243205A1 (en) 2002-09-18 2004-03-25 Zf Friedrichshafen Ag Bolt has threaded shaft with axial bore, pin being inserted into this from tip end which has conical or spherical section which widens it and locks thread into nut

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3925876A (en) 1974-03-26 1975-12-16 Trw Inc Method of joining bolts or rivets to nuts
US6458055B1 (en) 1999-04-12 2002-10-01 Litens Automotive Reversible tensioner
DE10243205A1 (en) 2002-09-18 2004-03-25 Zf Friedrichshafen Ag Bolt has threaded shaft with axial bore, pin being inserted into this from tip end which has conical or spherical section which widens it and locks thread into nut

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