DE19813586B4 - Tensioning device for drive belts - Google Patents
Tensioning device for drive belts Download PDFInfo
- Publication number
- DE19813586B4 DE19813586B4 DE1998113586 DE19813586A DE19813586B4 DE 19813586 B4 DE19813586 B4 DE 19813586B4 DE 1998113586 DE1998113586 DE 1998113586 DE 19813586 A DE19813586 A DE 19813586A DE 19813586 B4 DE19813586 B4 DE 19813586B4
- Authority
- DE
- Germany
- Prior art keywords
- friction
- bushing
- fixed
- damping
- wrap spring
- 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.)
- Expired - Fee Related
Links
Images
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
- 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
- F16H7/1218—Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley of an idle pulley with vibration damping means of the dry friction type
-
- 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
- F16H7/0829—Means for varying tension of belts, ropes, or chains with vibration damping means
- F16H2007/084—Means for varying tension of belts, ropes, or chains with vibration damping means having vibration damping characteristics dependent on the moving direction of the tensioner
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
Abstract
Spannvorrichtung für Treibriemen (7) mit relativ zueinander schwenkbaren Elementen (3, 5), wobei das bewegliche eine Spannrolle (4) aufweist und das andere fest ist, einer dazwischen angeordneten Spannfeder (6) und einer richtungsabhängigen Reibungsdämpfung, wobei eine mit einem freien Ende versehene Schlingfeder (1) mit dem anderen Ende fest an einem der Elemente (3, 5) eingespannt ist und mit ihren Windungen auf einer Reibbuchse (2) unter Gleitreibung bewegbar ist, mit folgenden weiteren Merkmalen:
– Die Reibbuchse (2) weist eine fest eingestellte Reibungsdämpfung gegenüber einem der relativ zueinander schwenkbaren Elemente (3, 5) auf,
– die Schlingfeder (1) sitzt unter Vorspannung auf einer Umfangsfläche (11) der Reibbuchse (2) und bildet
– eine Mitnahmekupplung in einer Schwenkrichtung weg vom Treibriemen (7) mit der fest eingestellten Reibungsdämpfung der Reibbuchse (2) und
– eine Freilaufkupplung in einer Schwenkrichtung zum Treibriemen (7), mit einer Reibungsdämpfung zwischen der Reibbuchse (2) und den Windungen der Schlingfeder...Tensioning device for drive belts (7) with relatively pivotable elements (3, 5), wherein the movable one tensioning roller (4) and the other is fixed, a tension spring arranged therebetween (6) and a direction-dependent friction damping, one with a free end provided wrap spring (1) with the other end fixed to one of the elements (3, 5) is clamped and with their turns on a friction bushing (2) under sliding friction is movable, with the following further features:
- The friction bush (2) has a fixed set friction damping against one of the relatively pivotable elements (3, 5),
- The wrap spring (1) is biased on a peripheral surface (11) of the friction bushing (2) and forms
- An entrainment clutch in a pivoting direction away from the drive belt (7) with the fixed friction damping of the friction bushing (2) and
- An overrunning clutch in a pivoting direction to the drive belt (7), with a friction damping between the friction bushing (2) and the turns of the wrap spring ...
Description
Die Erfindung betrifft eine Spannvorrichtung nach dem Oberbegriff des Hauptanspruches.The invention relates to a clamping device according to the preamble of the main claim.
Durch die
Aus der
Mit Erhöhung des Druckes bilden die Abmessungen und der Oberflächenzustand der Reibflächen eine wesentliche Rolle. Da die Schlingfeder vom Charakter her grundsätzlich zum Blockieren neigt, ist eine definierte Reibungsdämpfung mit gleichbleibenden Ergebnissen in der Serie nicht zu verwirklichen. Weiterhin werden die Reibflächen bei steigender Neigung zum Blockieren abgenützt und ändern damit ihre Reibeigenschaften. Schließlich, wenn der Fall völliges Blockieren eintritt, kommt es zur Überspannung des Treibriemens und damit zum Ausfall des Motors.As the pressure increases, the dimensions and surface condition of the friction surfaces are significant. Since the wrap spring basically has a tendency to block, a defined friction damping with consistent results in the series can not be realized. Furthermore, the friction surfaces are worn with increasing tendency to block and thus change their friction properties. Finally, when the case of complete blocking occurs, it leads to overstressing the drive belt and thus the failure of the engine.
Aufgabe der Erfindung ist es, die eingangs genannte Spannvorrichtung so zu verbessern, dass für die hohe Reibungsdämpfung in Richtung weg vom Treibriemen ein vorausberechnetes Reibmoment in der Serie stets gleich ist und sich im Betrieb nicht mehr verändert.The object of the invention is to improve the above-mentioned clamping device so that for the high friction damping in the direction away from the drive belt a vorausberechnetes friction torque in the series is always the same and does not change during operation.
Die Aufgabe wird durch die Merkmale des Anspruchs 1 gelöst.The object is solved by the features of
Durch diese Merkmale wird der Blockier-Effekt einer Schlingfeder mit mehreren Windungen ausgenützt. Sie nimmt die Reibbuchse durch direkte Kopplung in einer Richtung mit. Die Reibbuchse ist weiterhin über separate Reibflächen mit hohem Reibmoment gegenüber dem entsprechenden Element der Spannvorrichtung angeordnet. Die erforderliche Vorspannung der Reibfläche kann in bekannter Weise durch Federn oder elastische Reibbeläge erreicht werden. Wenn die Schlingfeder in umgekehrter Schwenkrichtung bewegt wird, löst sie sich von der Reibbuchse, wirkt als Freilaufkupplung und gleitet auf dieser mit nicht nennenswertem Reibmoment.These features exploit the blocking effect of a multi-turn wrap. It takes the friction bush by direct coupling in one direction. The friction bushing is furthermore arranged via separate friction surfaces with a high frictional torque with respect to the corresponding element of the tensioning device. The required bias of the friction surface can be achieved in a known manner by springs or elastic friction linings. When the wrap spring is moved in the opposite direction, it releases itself from the friction bushing, acts as an overrunning clutch and slides on it with no appreciable frictional torque.
Bei der Anwendung am Verbrennungsmotor werden die erfindungsgemäßen Merkmale dahingehend genutzt, daß die Reibungsdämpfung in Richtung zum Treibriemen, also in Spannrichtung, verschwindend klein ist und in die entgegengesetzte Richtung sehr hoch, beispielsweise nahe der maximal zulässigen Spannung des Treibriemens.When used on the internal combustion engine features of the invention are used to the effect that the friction damping in the direction of the drive belt, ie in the clamping direction, is vanishingly small and in the opposite direction very high, for example, close to the maximum allowable tension of the drive belt.
Daraus ergeben sich die Vorteile nahezu ungedämpftes und damit extrem schnelles Nachspannen des Treibriemens und maximale Dämpfung bei Stößen, Impulslasten des Motors, etc.This results in the advantages of almost undamped and thus extremely fast tensioning of the drive belt and maximum damping in the case of shocks, impulse loads of the engine, etc.
Die Erfindung wird nachfolgend an dem in der Zeichnung dargestellten Beispiel beschrieben.The invention will be described below with reference to the example shown in the drawing.
Die einzige Figur zeigt den teilweisen Längsschnitt einer Spannvorrichtung für Treibriemen mit Schlingfeder und Reibbuchse. Es sind nur die zum Verständnis wichtigen Einzelheiten und diese schematisch dargestellt.The single FIGURE shows the partial longitudinal section of a tensioning device for drive belt with wrap spring and friction bushing. It is only the details important to understanding and these are shown schematically.
Ein Schwenkarm
Die Reibbuchse
Auf der Umfangsfläche
Der Schwenkarm
Wenn der Treibriemen
In umgekehrter Schwenkrichtung, wenn die Spannrolle
Die dargestellte Ausführung ist nur ein Beispiel. Insbesondere die Erzeugung des Reibmoments zwischen Reibbuchse
Claims (5)
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1998113586 DE19813586B4 (en) | 1998-03-27 | 1998-03-27 | Tensioning device for drive belts |
IT1999TO000224 IT1309073B1 (en) | 1998-03-27 | 1999-03-23 | TENSIONING DEVICE FOR TRANSMISSION BELTS. |
FR9903784A FR2776734B1 (en) | 1998-03-27 | 1999-03-26 | TENSIONING DEVICE FOR A TRANSMISSION BELT |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1998113586 DE19813586B4 (en) | 1998-03-27 | 1998-03-27 | Tensioning device for drive belts |
Publications (2)
Publication Number | Publication Date |
---|---|
DE19813586A1 DE19813586A1 (en) | 1999-09-30 |
DE19813586B4 true DE19813586B4 (en) | 2011-03-24 |
Family
ID=7862568
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE1998113586 Expired - Fee Related DE19813586B4 (en) | 1998-03-27 | 1998-03-27 | Tensioning device for drive belts |
Country Status (3)
Country | Link |
---|---|
DE (1) | DE19813586B4 (en) |
FR (1) | FR2776734B1 (en) |
IT (1) | IT1309073B1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2951321B1 (en) | 1998-06-26 | 1999-09-20 | ユニッタ株式会社 | Auto tensioner |
CA2469497C (en) | 2001-12-05 | 2010-07-20 | Litens Automotive | Timing belt tensioner with stops controlled by frictional brake |
EP1838978B1 (en) | 2005-01-19 | 2009-07-08 | Litens Automotive Partnership | Timing belt tensioner |
DE102006059550A1 (en) * | 2006-12-16 | 2008-06-19 | Schaeffler Kg | Clamping device for a traction mechanism drive |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3637103A1 (en) * | 1986-10-31 | 1988-05-26 | Schaeffler Waelzlager Kg | Tensioning device |
DE3718227A1 (en) * | 1987-06-01 | 1988-12-15 | Werner Kotzab | Tensioner for belts and the like, particularly in motor vehicle engines |
DE4428559A1 (en) * | 1994-08-12 | 1996-02-15 | Schaeffler Waelzlager Kg | Slotted sliding bearing element for belt tightening device |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4583962A (en) * | 1984-12-07 | 1986-04-22 | Litens Automotive Inc. | Timing belt tensioner with damped constant spring tensioning and belt tooth disegagement prevention |
US4725260A (en) * | 1987-03-24 | 1988-02-16 | Litens Automotive Inc. | Belt tensioner with spring actuated band brake damping |
DE4124637A1 (en) * | 1991-07-25 | 1993-01-28 | Schaeffler Waelzlager Kg | Sprung belt tensioning assembly - has freewheel also acting as friction brake to dampen arm without separate friction sleeves |
DE4125494C1 (en) * | 1991-08-01 | 1992-11-12 | Continental Aktiengesellschaft, 3000 Hannover, De |
-
1998
- 1998-03-27 DE DE1998113586 patent/DE19813586B4/en not_active Expired - Fee Related
-
1999
- 1999-03-23 IT IT1999TO000224 patent/IT1309073B1/en active
- 1999-03-26 FR FR9903784A patent/FR2776734B1/en not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3637103A1 (en) * | 1986-10-31 | 1988-05-26 | Schaeffler Waelzlager Kg | Tensioning device |
DE3718227A1 (en) * | 1987-06-01 | 1988-12-15 | Werner Kotzab | Tensioner for belts and the like, particularly in motor vehicle engines |
DE4428559A1 (en) * | 1994-08-12 | 1996-02-15 | Schaeffler Waelzlager Kg | Slotted sliding bearing element for belt tightening device |
Also Published As
Publication number | Publication date |
---|---|
IT1309073B1 (en) | 2002-01-16 |
ITTO990224A1 (en) | 2000-09-23 |
FR2776734B1 (en) | 2002-10-04 |
FR2776734A1 (en) | 1999-10-01 |
DE19813586A1 (en) | 1999-09-30 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
8110 | Request for examination paragraph 44 | ||
R020 | Patent grant now final | ||
R020 | Patent grant now final |
Effective date: 20110810 |
|
R119 | Application deemed withdrawn, or ip right lapsed, due to non-payment of renewal fee | ||
R119 | Application deemed withdrawn, or ip right lapsed, due to non-payment of renewal fee |
Effective date: 20141001 |