WO2005121603A1 - Wrap-around drive comprising eccentric toothed wheels - Google Patents

Wrap-around drive comprising eccentric toothed wheels Download PDF

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Publication number
WO2005121603A1
WO2005121603A1 PCT/EP2005/005429 EP2005005429W WO2005121603A1 WO 2005121603 A1 WO2005121603 A1 WO 2005121603A1 EP 2005005429 W EP2005005429 W EP 2005005429W WO 2005121603 A1 WO2005121603 A1 WO 2005121603A1
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WO
WIPO (PCT)
Prior art keywords
drive
belt
wrap
teeth
gear
Prior art date
Application number
PCT/EP2005/005429
Other languages
German (de)
French (fr)
Inventor
Rainer Pflug
Rainer BAUMÜLLER
Original Assignee
Schaeffler 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 Schaeffler Kg filed Critical Schaeffler Kg
Publication of WO2005121603A1 publication Critical patent/WO2005121603A1/en

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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
    • F16H—GEARING
    • F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
    • F16H55/02—Toothed members; Worms
    • F16H55/30—Chain-wheels
    • 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
    • F16H35/00—Gearings or mechanisms with other special functional features
    • F16H2035/003—Gearings comprising pulleys or toothed members of non-circular shape, e.g. elliptical gears

Definitions

  • the invention relates to a belt drive, in particular control drive for an internal combustion engine or one of its auxiliary units, with at least one driving gear and at least one driving gear and a belt means connecting them (toothed belt or chain drive), at least one of the gears being non-circular, so that it is the rotation imposes an irregularity on the drive with the aim of calming the drive.
  • Control drives of internal combustion engines with a crankshaft drive wheel, at least one camshaft output gear and a chain or a toothed belt, or also other unit drives present on internal combustion engines are subject to vibration changes due to torque fluctuations or changes in angular velocity, which can lead to audible noise in resonance areas. This is associated with increased frictional forces, which can impair the lifespan of the belt drive and its efficiency.
  • the aim of the present invention to create a belt drive of the type mentioned, in which the calming of the drives combines with a particularly favorable run of the belt on the gears.
  • the non-round gear wheel is a round disk with teeth of different heights, the tooth height increasing over a fixed circumferential angle and decreasing over the same circumferential angle.
  • the design can be made so that the tooth contour has a tangent connecting two opposing arcs, with only the length of this tangent varying to change the tooth height.
  • Fig. 1 is a view of a gear according to the invention for a belt drive for a four-cylinder engine
  • the gear wheel 1 in FIG. 1 which represents a driving or driving gear, has a circular pitch circle 2, above which teeth of different tooth heights rise. Starting from the position at the top with the long teeth 3, the tooth height decreases continuously up to the shortest teeth 3 ′ offset by 90 °, then increases again and again over 90 °.
  • a non-uniformity x ⁇ y can be impressed on the belt drive, i.e. the chain or the toothed belt, in a corresponding manner, as in the case of a gear wheel of non-circular design, in which the pitch circle 2 is already non-circular, while the tooth height of all teeth is the same.
  • At least this superimposed non-uniformity means that a possible resonance frequency is shifted into areas that are not reached in normal operation, so that disturbing resonances cannot occur during operation.
  • Figures 2 and 3 show a special embodiment of the unequal teeth 3 and 3 '.
  • the tooth flank 4 in each case comprises two opposing circular arc sections 5 and 6, which are of the same design for the short teeth 3 'and the long teeth 3 and a tangent section 7, 7' connecting them, which varies with the tooth height.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Gears, Cams (AREA)

Abstract

Disclosed is a wrap-around drive, particularly a control drive for an internal combustion engine or one of the auxiliary units thereof. Said wrap-around drive comprises at least one driving toothed wheel, at least one driven toothed wheel, and a wrap-around means (toothed belt or chain drive) which connects the same. At least one of the toothed wheels is embodied eccentrically so as to impinge an irregularity onto the drive when rotating in order to steady the drive. The eccentric toothed wheel is configured as a round disk that is provided with teeth having a different height.

Description

Beschreibung der Erfindung Description of the invention
Umschlingungstrieb mit unrunden ZahnrädernBelt drive with non-circular gears
Gebiet der ErfindungField of the Invention
Die Erfindung bezieht sich auf einen Umschlingungstrieb, insbesondere Steuerungsantrieb für eine Brennkraftmaschine oder eines ihrer Nebenaggregate, mit mindestens einem antreibenden Zahnrad und mindestens einem abtreibenden Zahnrad und einem sie verbindenden Umschlingungsmittel (Zahnriemen oder Kettentrieb) wobei wenigstens eines der Zahnräder unrund ausgebildet ist, sodass es bei der Rotation dem Trieb eine Ungleichformigkeit aufprägt mit dem Ziel der Beruhigung des Triebes.The invention relates to a belt drive, in particular control drive for an internal combustion engine or one of its auxiliary units, with at least one driving gear and at least one driving gear and a belt means connecting them (toothed belt or chain drive), at least one of the gears being non-circular, so that it is the rotation imposes an irregularity on the drive with the aim of calming the drive.
Hintergrund der ErfindungBackground of the Invention
Steuerungsantriebe vom Brennkraftmaschinen mit einem Kurbelwellen- Antriebsrad, zumindest einem Nockenwellen-Abtriebsrad und einer Kette oder einem Zahnriemen, oder aber auch andere an Brennkraftmaschinen vorhandene Aggregatantriebe, sind aufgrund von Drehmomentschwankungen bzw. Winkelgeschwindigkeitsänderungen Schwingungsänderungen unterworfen, die in Resonanzbereichen zu hörbaren Geräuschen führen können. Damit verbunden sind erhöhte Reibungskräfte, die die Lebensdauer des Umschlingungstriebs sowie dessen Wirkungsgrad beeinträchtigen können.Control drives of internal combustion engines with a crankshaft drive wheel, at least one camshaft output gear and a chain or a toothed belt, or also other unit drives present on internal combustion engines, are subject to vibration changes due to torque fluctuations or changes in angular velocity, which can lead to audible noise in resonance areas. This is associated with increased frictional forces, which can impair the lifespan of the belt drive and its efficiency.
Um diesen Schwierigkeiten zu begegnen ist bereits vorgeschlagen worden wenigstens eines der Zahnräder so auszubilden, dass es bei der Rotation demIn order to counter these difficulties, it has already been proposed to design at least one of the gear wheels so that it rotates during rotation
Trieb eine Ungleichformigkeit aufprägt, wobei dies bei der DE 195 20 508 A1 dadurch erreicht wird, dass das entsprechende Rad unrund ausgebildet ist. Die Unrundheit ist dabei durch einen unrunden Teilkreis gegeben, über dem sich die ansonsten gleichmäßig ausgebildeten Zähne erheben.Drive impresses a non-uniformity, which is achieved in DE 195 20 508 A1 in that the corresponding wheel is non-circular. The Out of roundness is given by a non-circular pitch circle, above which the otherwise evenly formed teeth rise.
Zusammenfassung der ErfindungSummary of the invention
Ziel der vorliegenden Erfindung die Schaffung eines Umschlingungstriebs der eingangs genannten Art, bei dem sich die Beruhigung der Triebe mit einem besonders günstigen Ablauf des Umschlingungsmittels auf den Zahnrädern verbindet.The aim of the present invention to create a belt drive of the type mentioned, in which the calming of the drives combines with a particularly favorable run of the belt on the gears.
Zur Lösung dieser Aufgabe ist erfindungsgemäß vorgesehen, dass das unrunde Zahnrad eine runde Scheibe mit unterschiedlich hohen Zähnen ist, wobei die Zahnhöhe jeweils über einen festen Umfangswinkel zu und über den gleichen Umfangswinkel abnimmt.To achieve this object, it is provided according to the invention that the non-round gear wheel is a round disk with teeth of different heights, the tooth height increasing over a fixed circumferential angle and decreasing over the same circumferential angle.
Mit besonderem Vorteil kann dabei die Ausbildung so getroffen sein, dass die Zahnkontur eine zwei gegenläufige Kreisbögen verbindende Tangente aufweist, wobei zur Veränderung der Zahnhöhe lediglich die Länge dieser Tangente variiert.The design can be made so that the tooth contour has a tangent connecting two opposing arcs, with only the length of this tangent varying to change the tooth height.
Kurze Beschreibung der ZeichnungenBrief description of the drawings
Weitere Vorteile, Merkmale und Einzelheiten der Erfindung ergeben sich aus der nachfolgenden Beschreibung eines Ausführungsbeispiels sowie anhand der Zeichnung. Dabei zeigen:Further advantages, features and details of the invention result from the following description of an exemplary embodiment and from the drawing. Show:
Fig. 1 eine Ansicht eines erfindungsgemäßen Zahnrades für einen Umschlingungstrieb für einen Vierzylindermotor undFig. 1 is a view of a gear according to the invention for a belt drive for a four-cylinder engine and
Fig. 2 und 3 vergrößerte Detailausschnitte II und III im Bereich der kurzen bzw. langen Zähne. Detaillierte Beschreibung der Zeichnungen2 and 3 enlarged detail sections II and III in the area of the short and long teeth. Detailed description of the drawings
Das ein antreibendes oder abtreibendes Zahnrad darstellende Zahnrad 1 in Fig. 1 weist einen kreisrunden Teilkreis 2 auf, über dem sich Zähne unter- schiedlicher Zahnhöhe erheben. Ausgehend von der Position ganz oben mit den langen Zähnen 3 nimmt die Zahnhöhe kontinuierlich bis zu den um 90° versetzten kürzesten Zähnen 3' ab, nimmt dann wieder über 90° zu, ab und wieder zu. Durch diese unterschiedliche Zahnhöhe lässt sich entsprechenderweise wie bei einem insgesamt unrund ausgebildeten Zahnrad, bei dem also der Teilkreis 2 bereits unrund ausgebildet ist, während die Zahnhöhe aller Zähne gleich ist, dem Umschlingungstrieb, also der Kette oder dem Zahnriemen eine Ungleichformigkeit x<y aufprägen, die den im Trieb vorhandenen Ungleichförmigkeiten entgegengerichtet ist, sodass zumindest zu einem gewissen Grad ein Ausgleich stattfindet. Zumindest wird durch diese überlagerte Ungleichformigkeit erreicht, dass eine etwaige Resonanzfrequenz in Bereiche verlagert wird, die im normalen Betrieb nicht erreicht wird, sodass störende Resonanzen im Betrieb also auch gar nicht auftreten können.The gear wheel 1 in FIG. 1, which represents a driving or driving gear, has a circular pitch circle 2, above which teeth of different tooth heights rise. Starting from the position at the top with the long teeth 3, the tooth height decreases continuously up to the shortest teeth 3 ′ offset by 90 °, then increases again and again over 90 °. By means of these different tooth heights, a non-uniformity x <y can be impressed on the belt drive, i.e. the chain or the toothed belt, in a corresponding manner, as in the case of a gear wheel of non-circular design, in which the pitch circle 2 is already non-circular, while the tooth height of all teeth is the same. which is directed against the irregularities present in the drive, so that a compensation takes place at least to a certain extent. At least this superimposed non-uniformity means that a possible resonance frequency is shifted into areas that are not reached in normal operation, so that disturbing resonances cannot occur during operation.
Die Figuren 2 und 3 zeigen eine spezielle Ausbildungsform der ungleich hoch ausgebildeten Zähne 3 und 3'. Die Zahnflanke 4 umfasst dabei jeweils zwei gegenläufige Kreisbogenabschnitte 5 und 6, die bei den kurzen Zähnen 3' und den langen Zähnen 3 gleich ausgebildet sind und eine sie verbindenden Tangentenabschnitt 7, 7', der mit der Zahnhöhe variiert. Figures 2 and 3 show a special embodiment of the unequal teeth 3 and 3 '. The tooth flank 4 in each case comprises two opposing circular arc sections 5 and 6, which are of the same design for the short teeth 3 'and the long teeth 3 and a tangent section 7, 7' connecting them, which varies with the tooth height.
Bezugszahlenreference numerals
Zahnrad kreisrunder Teilkreis lange Zähne ' kurze Zähne Zahnflanke Kreisbogenabschnitt Kreisbogenabschnitt Tangentenabschnitt ' Tangentenabschnitt Gear circular pitch circle long teeth 'short teeth tooth flank circular arc section circular arc section tangent section' tangent section

Claims

Patentansprüche claims
1. Umschlingungstrieb, insbesondere Steuerungsantrieb für eine Brennkraftmaschine oder eines ihrer Nebenaggregate, mit mindestens einem antreibenden Zahnrad und mindestens einem abtreibenden Zahnrad und einem sie verbindenden Umschlingungsmittel (Zahnriemen oder Kettentrieb), wobei wenigstens eines der Zahnräder unrund ausgebildet ist, sodass es bei der Rotation dem Trieb eine Ungleichformigkeit aufprägt mit dem Ziel der Beruhigung des Triebes, dadurch gekennzeichnet, dass das unrunde Zahnrad (1) eine runde Scheibe mit unterschiedlich hohen Zähnen (3, 3') ist.1. Belt drive, in particular control drive for an internal combustion engine or one of its auxiliary units, with at least one driving gear and at least one driven gear and a belt means connecting them (toothed belt or chain drive), at least one of the gears being non-circular, so that it rotates during rotation Drive imposes a non-uniformity with the aim of calming the drive, characterized in that the non-round gear (1) is a round disc with teeth of different heights (3, 3 ').
2. Umschlingungstrieb nach Anspruch 1, dadurch gekennzeichnet, dass die Zahnhöhe jeweils über einen festen Umfangs-Winkel zu und über den gleichen Winkel abnimmt.2. Belt drive according to claim 1, characterized in that the tooth height decreases over a fixed circumferential angle and decreases over the same angle.
3. Umschlingungstrieb nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Zahnkontur eine zwei gegenläufige Kreisbögen (5, 6) verbindende Tangente (7, 7') aufweist, wobei die Länge dieser Tangente (7, 7') variiert. 3. belt drive according to claim 1 or 2, characterized in that the tooth contour has a two opposite circular arcs (5, 6) connecting tangent (7, 7 '), the length of this tangent (7, 7') varies.
PCT/EP2005/005429 2004-06-09 2005-05-19 Wrap-around drive comprising eccentric toothed wheels WO2005121603A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004028222.6 2004-06-09
DE200410028222 DE102004028222A1 (en) 2004-06-09 2004-06-09 Belt drive with non-circular gears

Publications (1)

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WO2005121603A1 true WO2005121603A1 (en) 2005-12-22

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WO (1) WO2005121603A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9341243B2 (en) 2012-03-29 2016-05-17 Litens Automotive Partnership Tensioner and endless drive arrangement
US11174921B2 (en) 2016-09-13 2021-11-16 Litens Automotive Partnership V tensioner and endless drive arrangement

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005008676A1 (en) * 2005-02-25 2006-06-22 Audi Ag Toothed wheel for tooth chain drive has external teeth with internal spacing between teeth whereby distance between axis of rotation and pitch circle of toothed wheel changes sinusoidally along its circumference
JP4386377B2 (en) 2007-06-12 2009-12-16 株式会社椿本チエイン Silent chain transmission
DE102009033390A1 (en) 2009-07-16 2011-01-20 Schaeffler Technologies Gmbh & Co. Kg Tractive drive, particularly control drive for internal combustion engine, has endless traction mechanism connecting drive wheel and driven wheel in form-fit manner

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US2259937A (en) * 1940-02-05 1941-10-21 Chain Belt Co Roller chain sprocket wheel
GB551756A (en) * 1941-09-03 1943-03-09 Hermann Klaucke Improvements in roller chain sprocket wheels
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US5145188A (en) * 1990-05-19 1992-09-08 Wilhelm Herm. Muller GmbH & Co. KG Toothed-belt drive
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US586991A (en) * 1897-07-27 Drive-gear
US2259937A (en) * 1940-02-05 1941-10-21 Chain Belt Co Roller chain sprocket wheel
GB551756A (en) * 1941-09-03 1943-03-09 Hermann Klaucke Improvements in roller chain sprocket wheels
US3377875A (en) * 1966-05-09 1968-04-16 Gen Motors Corp Chain drive power transmitting mechanism
US3583250A (en) * 1969-04-01 1971-06-08 Rca Corp Transmission including toothed belt and partially toothed pulley
JPS63106453A (en) * 1986-10-21 1988-05-11 Nippon Soken Inc Timing belt mechanism
US5145188A (en) * 1990-05-19 1992-09-08 Wilhelm Herm. Muller GmbH & Co. KG Toothed-belt drive
DE19520508A1 (en) 1995-06-03 1996-12-05 Audi Ag Control belt or timing drive for IC engine
EP0803662A1 (en) * 1996-04-23 1997-10-29 Continental Aktiengesellschaft Toothed wheel with a flanged wheel for a toothed belt drive
US6364798B1 (en) * 1997-09-30 2002-04-02 Ford Global Technologies, Inc. Sprocket for roller chain drives

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9341243B2 (en) 2012-03-29 2016-05-17 Litens Automotive Partnership Tensioner and endless drive arrangement
US11174921B2 (en) 2016-09-13 2021-11-16 Litens Automotive Partnership V tensioner and endless drive arrangement

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